3527 lines
95 KiB
C
3527 lines
95 KiB
C
#include "../cache.h"
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#include "../refs.h"
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#include "refs-internal.h"
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#include "../lockfile.h"
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#include "../object.h"
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#include "../dir.h"
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struct ref_lock {
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char *ref_name;
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char *orig_ref_name;
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struct lock_file *lk;
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struct object_id old_oid;
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};
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struct ref_entry;
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/*
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* Information used (along with the information in ref_entry) to
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* describe a single cached reference. This data structure only
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* occurs embedded in a union in struct ref_entry, and only when
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* (ref_entry->flag & REF_DIR) is zero.
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*/
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struct ref_value {
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/*
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* The name of the object to which this reference resolves
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* (which may be a tag object). If REF_ISBROKEN, this is
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* null. If REF_ISSYMREF, then this is the name of the object
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* referred to by the last reference in the symlink chain.
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*/
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struct object_id oid;
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/*
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* If REF_KNOWS_PEELED, then this field holds the peeled value
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* of this reference, or null if the reference is known not to
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* be peelable. See the documentation for peel_ref() for an
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* exact definition of "peelable".
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*/
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struct object_id peeled;
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};
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struct ref_cache;
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/*
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* Information used (along with the information in ref_entry) to
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* describe a level in the hierarchy of references. This data
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* structure only occurs embedded in a union in struct ref_entry, and
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* only when (ref_entry.flag & REF_DIR) is set. In that case,
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* (ref_entry.flag & REF_INCOMPLETE) determines whether the references
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* in the directory have already been read:
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*
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* (ref_entry.flag & REF_INCOMPLETE) unset -- a directory of loose
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* or packed references, already read.
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*
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* (ref_entry.flag & REF_INCOMPLETE) set -- a directory of loose
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* references that hasn't been read yet (nor has any of its
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* subdirectories).
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*
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* Entries within a directory are stored within a growable array of
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* pointers to ref_entries (entries, nr, alloc). Entries 0 <= i <
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* sorted are sorted by their component name in strcmp() order and the
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* remaining entries are unsorted.
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*
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* Loose references are read lazily, one directory at a time. When a
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* directory of loose references is read, then all of the references
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* in that directory are stored, and REF_INCOMPLETE stubs are created
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* for any subdirectories, but the subdirectories themselves are not
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* read. The reading is triggered by get_ref_dir().
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*/
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struct ref_dir {
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int nr, alloc;
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/*
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* Entries with index 0 <= i < sorted are sorted by name. New
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* entries are appended to the list unsorted, and are sorted
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* only when required; thus we avoid the need to sort the list
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* after the addition of every reference.
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*/
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int sorted;
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/* A pointer to the ref_cache that contains this ref_dir. */
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struct ref_cache *ref_cache;
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struct ref_entry **entries;
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};
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/*
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* Bit values for ref_entry::flag. REF_ISSYMREF=0x01,
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* REF_ISPACKED=0x02, REF_ISBROKEN=0x04 and REF_BAD_NAME=0x08 are
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* public values; see refs.h.
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*/
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/*
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* The field ref_entry->u.value.peeled of this value entry contains
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* the correct peeled value for the reference, which might be
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* null_sha1 if the reference is not a tag or if it is broken.
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*/
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#define REF_KNOWS_PEELED 0x10
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/* ref_entry represents a directory of references */
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#define REF_DIR 0x20
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/*
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* Entry has not yet been read from disk (used only for REF_DIR
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* entries representing loose references)
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*/
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#define REF_INCOMPLETE 0x40
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/*
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* A ref_entry represents either a reference or a "subdirectory" of
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* references.
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*
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* Each directory in the reference namespace is represented by a
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* ref_entry with (flags & REF_DIR) set and containing a subdir member
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* that holds the entries in that directory that have been read so
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* far. If (flags & REF_INCOMPLETE) is set, then the directory and
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* its subdirectories haven't been read yet. REF_INCOMPLETE is only
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* used for loose reference directories.
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*
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* References are represented by a ref_entry with (flags & REF_DIR)
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* unset and a value member that describes the reference's value. The
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* flag member is at the ref_entry level, but it is also needed to
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* interpret the contents of the value field (in other words, a
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* ref_value object is not very much use without the enclosing
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* ref_entry).
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*
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* Reference names cannot end with slash and directories' names are
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* always stored with a trailing slash (except for the top-level
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* directory, which is always denoted by ""). This has two nice
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* consequences: (1) when the entries in each subdir are sorted
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* lexicographically by name (as they usually are), the references in
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* a whole tree can be generated in lexicographic order by traversing
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* the tree in left-to-right, depth-first order; (2) the names of
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* references and subdirectories cannot conflict, and therefore the
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* presence of an empty subdirectory does not block the creation of a
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* similarly-named reference. (The fact that reference names with the
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* same leading components can conflict *with each other* is a
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* separate issue that is regulated by verify_refname_available().)
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*
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* Please note that the name field contains the fully-qualified
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* reference (or subdirectory) name. Space could be saved by only
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* storing the relative names. But that would require the full names
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* to be generated on the fly when iterating in do_for_each_ref(), and
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* would break callback functions, who have always been able to assume
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* that the name strings that they are passed will not be freed during
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* the iteration.
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*/
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struct ref_entry {
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unsigned char flag; /* ISSYMREF? ISPACKED? */
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union {
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struct ref_value value; /* if not (flags&REF_DIR) */
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struct ref_dir subdir; /* if (flags&REF_DIR) */
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} u;
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/*
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* The full name of the reference (e.g., "refs/heads/master")
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* or the full name of the directory with a trailing slash
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* (e.g., "refs/heads/"):
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*/
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char name[FLEX_ARRAY];
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};
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static void read_loose_refs(const char *dirname, struct ref_dir *dir);
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static int search_ref_dir(struct ref_dir *dir, const char *refname, size_t len);
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static struct ref_entry *create_dir_entry(struct ref_cache *ref_cache,
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const char *dirname, size_t len,
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int incomplete);
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static void add_entry_to_dir(struct ref_dir *dir, struct ref_entry *entry);
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static struct ref_dir *get_ref_dir(struct ref_entry *entry)
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{
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struct ref_dir *dir;
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assert(entry->flag & REF_DIR);
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dir = &entry->u.subdir;
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if (entry->flag & REF_INCOMPLETE) {
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read_loose_refs(entry->name, dir);
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/*
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* Manually add refs/bisect, which, being
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* per-worktree, might not appear in the directory
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* listing for refs/ in the main repo.
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*/
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if (!strcmp(entry->name, "refs/")) {
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int pos = search_ref_dir(dir, "refs/bisect/", 12);
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if (pos < 0) {
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struct ref_entry *child_entry;
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child_entry = create_dir_entry(dir->ref_cache,
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"refs/bisect/",
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12, 1);
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add_entry_to_dir(dir, child_entry);
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read_loose_refs("refs/bisect",
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&child_entry->u.subdir);
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}
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}
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entry->flag &= ~REF_INCOMPLETE;
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}
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return dir;
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}
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static struct ref_entry *create_ref_entry(const char *refname,
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const unsigned char *sha1, int flag,
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int check_name)
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{
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struct ref_entry *ref;
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if (check_name &&
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check_refname_format(refname, REFNAME_ALLOW_ONELEVEL))
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die("Reference has invalid format: '%s'", refname);
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FLEX_ALLOC_STR(ref, name, refname);
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hashcpy(ref->u.value.oid.hash, sha1);
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oidclr(&ref->u.value.peeled);
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ref->flag = flag;
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return ref;
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}
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static void clear_ref_dir(struct ref_dir *dir);
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static void free_ref_entry(struct ref_entry *entry)
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{
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if (entry->flag & REF_DIR) {
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/*
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* Do not use get_ref_dir() here, as that might
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* trigger the reading of loose refs.
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*/
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clear_ref_dir(&entry->u.subdir);
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}
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free(entry);
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}
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/*
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* Add a ref_entry to the end of dir (unsorted). Entry is always
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* stored directly in dir; no recursion into subdirectories is
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* done.
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*/
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static void add_entry_to_dir(struct ref_dir *dir, struct ref_entry *entry)
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{
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ALLOC_GROW(dir->entries, dir->nr + 1, dir->alloc);
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dir->entries[dir->nr++] = entry;
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/* optimize for the case that entries are added in order */
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if (dir->nr == 1 ||
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(dir->nr == dir->sorted + 1 &&
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strcmp(dir->entries[dir->nr - 2]->name,
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dir->entries[dir->nr - 1]->name) < 0))
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dir->sorted = dir->nr;
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}
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/*
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* Clear and free all entries in dir, recursively.
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*/
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static void clear_ref_dir(struct ref_dir *dir)
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{
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int i;
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for (i = 0; i < dir->nr; i++)
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free_ref_entry(dir->entries[i]);
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free(dir->entries);
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dir->sorted = dir->nr = dir->alloc = 0;
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dir->entries = NULL;
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}
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/*
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* Create a struct ref_entry object for the specified dirname.
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* dirname is the name of the directory with a trailing slash (e.g.,
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* "refs/heads/") or "" for the top-level directory.
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*/
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static struct ref_entry *create_dir_entry(struct ref_cache *ref_cache,
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const char *dirname, size_t len,
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int incomplete)
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{
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struct ref_entry *direntry;
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FLEX_ALLOC_MEM(direntry, name, dirname, len);
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direntry->u.subdir.ref_cache = ref_cache;
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direntry->flag = REF_DIR | (incomplete ? REF_INCOMPLETE : 0);
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return direntry;
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}
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static int ref_entry_cmp(const void *a, const void *b)
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{
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struct ref_entry *one = *(struct ref_entry **)a;
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struct ref_entry *two = *(struct ref_entry **)b;
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return strcmp(one->name, two->name);
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}
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static void sort_ref_dir(struct ref_dir *dir);
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struct string_slice {
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size_t len;
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const char *str;
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};
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static int ref_entry_cmp_sslice(const void *key_, const void *ent_)
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{
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const struct string_slice *key = key_;
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const struct ref_entry *ent = *(const struct ref_entry * const *)ent_;
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int cmp = strncmp(key->str, ent->name, key->len);
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if (cmp)
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return cmp;
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return '\0' - (unsigned char)ent->name[key->len];
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}
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/*
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* Return the index of the entry with the given refname from the
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* ref_dir (non-recursively), sorting dir if necessary. Return -1 if
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* no such entry is found. dir must already be complete.
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*/
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static int search_ref_dir(struct ref_dir *dir, const char *refname, size_t len)
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{
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struct ref_entry **r;
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struct string_slice key;
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if (refname == NULL || !dir->nr)
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return -1;
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sort_ref_dir(dir);
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key.len = len;
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key.str = refname;
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r = bsearch(&key, dir->entries, dir->nr, sizeof(*dir->entries),
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ref_entry_cmp_sslice);
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if (r == NULL)
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return -1;
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return r - dir->entries;
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}
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/*
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* Search for a directory entry directly within dir (without
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* recursing). Sort dir if necessary. subdirname must be a directory
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* name (i.e., end in '/'). If mkdir is set, then create the
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* directory if it is missing; otherwise, return NULL if the desired
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* directory cannot be found. dir must already be complete.
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*/
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static struct ref_dir *search_for_subdir(struct ref_dir *dir,
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const char *subdirname, size_t len,
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int mkdir)
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{
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int entry_index = search_ref_dir(dir, subdirname, len);
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struct ref_entry *entry;
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if (entry_index == -1) {
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if (!mkdir)
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return NULL;
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/*
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* Since dir is complete, the absence of a subdir
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* means that the subdir really doesn't exist;
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* therefore, create an empty record for it but mark
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* the record complete.
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*/
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entry = create_dir_entry(dir->ref_cache, subdirname, len, 0);
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add_entry_to_dir(dir, entry);
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} else {
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entry = dir->entries[entry_index];
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}
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return get_ref_dir(entry);
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}
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/*
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* If refname is a reference name, find the ref_dir within the dir
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* tree that should hold refname. If refname is a directory name
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* (i.e., ends in '/'), then return that ref_dir itself. dir must
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* represent the top-level directory and must already be complete.
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* Sort ref_dirs and recurse into subdirectories as necessary. If
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* mkdir is set, then create any missing directories; otherwise,
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* return NULL if the desired directory cannot be found.
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*/
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static struct ref_dir *find_containing_dir(struct ref_dir *dir,
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const char *refname, int mkdir)
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{
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const char *slash;
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for (slash = strchr(refname, '/'); slash; slash = strchr(slash + 1, '/')) {
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size_t dirnamelen = slash - refname + 1;
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struct ref_dir *subdir;
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subdir = search_for_subdir(dir, refname, dirnamelen, mkdir);
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if (!subdir) {
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dir = NULL;
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break;
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}
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dir = subdir;
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}
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return dir;
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}
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/*
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* Find the value entry with the given name in dir, sorting ref_dirs
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* and recursing into subdirectories as necessary. If the name is not
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* found or it corresponds to a directory entry, return NULL.
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*/
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static struct ref_entry *find_ref(struct ref_dir *dir, const char *refname)
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{
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int entry_index;
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struct ref_entry *entry;
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dir = find_containing_dir(dir, refname, 0);
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if (!dir)
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return NULL;
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entry_index = search_ref_dir(dir, refname, strlen(refname));
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if (entry_index == -1)
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return NULL;
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entry = dir->entries[entry_index];
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return (entry->flag & REF_DIR) ? NULL : entry;
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}
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/*
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* Remove the entry with the given name from dir, recursing into
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* subdirectories as necessary. If refname is the name of a directory
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* (i.e., ends with '/'), then remove the directory and its contents.
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* If the removal was successful, return the number of entries
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* remaining in the directory entry that contained the deleted entry.
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* If the name was not found, return -1. Please note that this
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* function only deletes the entry from the cache; it does not delete
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* it from the filesystem or ensure that other cache entries (which
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* might be symbolic references to the removed entry) are updated.
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* Nor does it remove any containing dir entries that might be made
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* empty by the removal. dir must represent the top-level directory
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* and must already be complete.
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*/
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static int remove_entry(struct ref_dir *dir, const char *refname)
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{
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int refname_len = strlen(refname);
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int entry_index;
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struct ref_entry *entry;
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int is_dir = refname[refname_len - 1] == '/';
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if (is_dir) {
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/*
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* refname represents a reference directory. Remove
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* the trailing slash; otherwise we will get the
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* directory *representing* refname rather than the
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* one *containing* it.
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*/
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char *dirname = xmemdupz(refname, refname_len - 1);
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dir = find_containing_dir(dir, dirname, 0);
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free(dirname);
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} else {
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dir = find_containing_dir(dir, refname, 0);
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}
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if (!dir)
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return -1;
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entry_index = search_ref_dir(dir, refname, refname_len);
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if (entry_index == -1)
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return -1;
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entry = dir->entries[entry_index];
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memmove(&dir->entries[entry_index],
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&dir->entries[entry_index + 1],
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(dir->nr - entry_index - 1) * sizeof(*dir->entries)
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);
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dir->nr--;
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if (dir->sorted > entry_index)
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dir->sorted--;
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free_ref_entry(entry);
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return dir->nr;
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}
|
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|
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/*
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* Add a ref_entry to the ref_dir (unsorted), recursing into
|
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* subdirectories as necessary. dir must represent the top-level
|
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* directory. Return 0 on success.
|
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*/
|
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static int add_ref(struct ref_dir *dir, struct ref_entry *ref)
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{
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dir = find_containing_dir(dir, ref->name, 1);
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if (!dir)
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return -1;
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add_entry_to_dir(dir, ref);
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return 0;
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}
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|
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/*
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* Emit a warning and return true iff ref1 and ref2 have the same name
|
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* and the same sha1. Die if they have the same name but different
|
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* sha1s.
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*/
|
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static int is_dup_ref(const struct ref_entry *ref1, const struct ref_entry *ref2)
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{
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if (strcmp(ref1->name, ref2->name))
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return 0;
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|
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/* Duplicate name; make sure that they don't conflict: */
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|
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if ((ref1->flag & REF_DIR) || (ref2->flag & REF_DIR))
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/* This is impossible by construction */
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die("Reference directory conflict: %s", ref1->name);
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|
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if (oidcmp(&ref1->u.value.oid, &ref2->u.value.oid))
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die("Duplicated ref, and SHA1s don't match: %s", ref1->name);
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|
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warning("Duplicated ref: %s", ref1->name);
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return 1;
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}
|
|
|
|
/*
|
|
* Sort the entries in dir non-recursively (if they are not already
|
|
* sorted) and remove any duplicate entries.
|
|
*/
|
|
static void sort_ref_dir(struct ref_dir *dir)
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|
{
|
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int i, j;
|
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struct ref_entry *last = NULL;
|
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|
|
/*
|
|
* This check also prevents passing a zero-length array to qsort(),
|
|
* which is a problem on some platforms.
|
|
*/
|
|
if (dir->sorted == dir->nr)
|
|
return;
|
|
|
|
qsort(dir->entries, dir->nr, sizeof(*dir->entries), ref_entry_cmp);
|
|
|
|
/* Remove any duplicates: */
|
|
for (i = 0, j = 0; j < dir->nr; j++) {
|
|
struct ref_entry *entry = dir->entries[j];
|
|
if (last && is_dup_ref(last, entry))
|
|
free_ref_entry(entry);
|
|
else
|
|
last = dir->entries[i++] = entry;
|
|
}
|
|
dir->sorted = dir->nr = i;
|
|
}
|
|
|
|
/* Include broken references in a do_for_each_ref*() iteration: */
|
|
#define DO_FOR_EACH_INCLUDE_BROKEN 0x01
|
|
|
|
/*
|
|
* Return true iff the reference described by entry can be resolved to
|
|
* an object in the database. Emit a warning if the referred-to
|
|
* object does not exist.
|
|
*/
|
|
static int ref_resolves_to_object(struct ref_entry *entry)
|
|
{
|
|
if (entry->flag & REF_ISBROKEN)
|
|
return 0;
|
|
if (!has_sha1_file(entry->u.value.oid.hash)) {
|
|
error("%s does not point to a valid object!", entry->name);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* current_ref is a performance hack: when iterating over references
|
|
* using the for_each_ref*() functions, current_ref is set to the
|
|
* current reference's entry before calling the callback function. If
|
|
* the callback function calls peel_ref(), then peel_ref() first
|
|
* checks whether the reference to be peeled is the current reference
|
|
* (it usually is) and if so, returns that reference's peeled version
|
|
* if it is available. This avoids a refname lookup in a common case.
|
|
*/
|
|
static struct ref_entry *current_ref;
|
|
|
|
typedef int each_ref_entry_fn(struct ref_entry *entry, void *cb_data);
|
|
|
|
struct ref_entry_cb {
|
|
const char *base;
|
|
int trim;
|
|
int flags;
|
|
each_ref_fn *fn;
|
|
void *cb_data;
|
|
};
|
|
|
|
/*
|
|
* Handle one reference in a do_for_each_ref*()-style iteration,
|
|
* calling an each_ref_fn for each entry.
|
|
*/
|
|
static int do_one_ref(struct ref_entry *entry, void *cb_data)
|
|
{
|
|
struct ref_entry_cb *data = cb_data;
|
|
struct ref_entry *old_current_ref;
|
|
int retval;
|
|
|
|
if (!starts_with(entry->name, data->base))
|
|
return 0;
|
|
|
|
if (!(data->flags & DO_FOR_EACH_INCLUDE_BROKEN) &&
|
|
!ref_resolves_to_object(entry))
|
|
return 0;
|
|
|
|
/* Store the old value, in case this is a recursive call: */
|
|
old_current_ref = current_ref;
|
|
current_ref = entry;
|
|
retval = data->fn(entry->name + data->trim, &entry->u.value.oid,
|
|
entry->flag, data->cb_data);
|
|
current_ref = old_current_ref;
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* Call fn for each reference in dir that has index in the range
|
|
* offset <= index < dir->nr. Recurse into subdirectories that are in
|
|
* that index range, sorting them before iterating. This function
|
|
* does not sort dir itself; it should be sorted beforehand. fn is
|
|
* called for all references, including broken ones.
|
|
*/
|
|
static int do_for_each_entry_in_dir(struct ref_dir *dir, int offset,
|
|
each_ref_entry_fn fn, void *cb_data)
|
|
{
|
|
int i;
|
|
assert(dir->sorted == dir->nr);
|
|
for (i = offset; i < dir->nr; i++) {
|
|
struct ref_entry *entry = dir->entries[i];
|
|
int retval;
|
|
if (entry->flag & REF_DIR) {
|
|
struct ref_dir *subdir = get_ref_dir(entry);
|
|
sort_ref_dir(subdir);
|
|
retval = do_for_each_entry_in_dir(subdir, 0, fn, cb_data);
|
|
} else {
|
|
retval = fn(entry, cb_data);
|
|
}
|
|
if (retval)
|
|
return retval;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Call fn for each reference in the union of dir1 and dir2, in order
|
|
* by refname. Recurse into subdirectories. If a value entry appears
|
|
* in both dir1 and dir2, then only process the version that is in
|
|
* dir2. The input dirs must already be sorted, but subdirs will be
|
|
* sorted as needed. fn is called for all references, including
|
|
* broken ones.
|
|
*/
|
|
static int do_for_each_entry_in_dirs(struct ref_dir *dir1,
|
|
struct ref_dir *dir2,
|
|
each_ref_entry_fn fn, void *cb_data)
|
|
{
|
|
int retval;
|
|
int i1 = 0, i2 = 0;
|
|
|
|
assert(dir1->sorted == dir1->nr);
|
|
assert(dir2->sorted == dir2->nr);
|
|
while (1) {
|
|
struct ref_entry *e1, *e2;
|
|
int cmp;
|
|
if (i1 == dir1->nr) {
|
|
return do_for_each_entry_in_dir(dir2, i2, fn, cb_data);
|
|
}
|
|
if (i2 == dir2->nr) {
|
|
return do_for_each_entry_in_dir(dir1, i1, fn, cb_data);
|
|
}
|
|
e1 = dir1->entries[i1];
|
|
e2 = dir2->entries[i2];
|
|
cmp = strcmp(e1->name, e2->name);
|
|
if (cmp == 0) {
|
|
if ((e1->flag & REF_DIR) && (e2->flag & REF_DIR)) {
|
|
/* Both are directories; descend them in parallel. */
|
|
struct ref_dir *subdir1 = get_ref_dir(e1);
|
|
struct ref_dir *subdir2 = get_ref_dir(e2);
|
|
sort_ref_dir(subdir1);
|
|
sort_ref_dir(subdir2);
|
|
retval = do_for_each_entry_in_dirs(
|
|
subdir1, subdir2, fn, cb_data);
|
|
i1++;
|
|
i2++;
|
|
} else if (!(e1->flag & REF_DIR) && !(e2->flag & REF_DIR)) {
|
|
/* Both are references; ignore the one from dir1. */
|
|
retval = fn(e2, cb_data);
|
|
i1++;
|
|
i2++;
|
|
} else {
|
|
die("conflict between reference and directory: %s",
|
|
e1->name);
|
|
}
|
|
} else {
|
|
struct ref_entry *e;
|
|
if (cmp < 0) {
|
|
e = e1;
|
|
i1++;
|
|
} else {
|
|
e = e2;
|
|
i2++;
|
|
}
|
|
if (e->flag & REF_DIR) {
|
|
struct ref_dir *subdir = get_ref_dir(e);
|
|
sort_ref_dir(subdir);
|
|
retval = do_for_each_entry_in_dir(
|
|
subdir, 0, fn, cb_data);
|
|
} else {
|
|
retval = fn(e, cb_data);
|
|
}
|
|
}
|
|
if (retval)
|
|
return retval;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Load all of the refs from the dir into our in-memory cache. The hard work
|
|
* of loading loose refs is done by get_ref_dir(), so we just need to recurse
|
|
* through all of the sub-directories. We do not even need to care about
|
|
* sorting, as traversal order does not matter to us.
|
|
*/
|
|
static void prime_ref_dir(struct ref_dir *dir)
|
|
{
|
|
int i;
|
|
for (i = 0; i < dir->nr; i++) {
|
|
struct ref_entry *entry = dir->entries[i];
|
|
if (entry->flag & REF_DIR)
|
|
prime_ref_dir(get_ref_dir(entry));
|
|
}
|
|
}
|
|
|
|
struct nonmatching_ref_data {
|
|
const struct string_list *skip;
|
|
const char *conflicting_refname;
|
|
};
|
|
|
|
static int nonmatching_ref_fn(struct ref_entry *entry, void *vdata)
|
|
{
|
|
struct nonmatching_ref_data *data = vdata;
|
|
|
|
if (data->skip && string_list_has_string(data->skip, entry->name))
|
|
return 0;
|
|
|
|
data->conflicting_refname = entry->name;
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Return 0 if a reference named refname could be created without
|
|
* conflicting with the name of an existing reference in dir.
|
|
* See verify_refname_available for more information.
|
|
*/
|
|
static int verify_refname_available_dir(const char *refname,
|
|
const struct string_list *extras,
|
|
const struct string_list *skip,
|
|
struct ref_dir *dir,
|
|
struct strbuf *err)
|
|
{
|
|
const char *slash;
|
|
const char *extra_refname;
|
|
int pos;
|
|
struct strbuf dirname = STRBUF_INIT;
|
|
int ret = -1;
|
|
|
|
/*
|
|
* For the sake of comments in this function, suppose that
|
|
* refname is "refs/foo/bar".
|
|
*/
|
|
|
|
assert(err);
|
|
|
|
strbuf_grow(&dirname, strlen(refname) + 1);
|
|
for (slash = strchr(refname, '/'); slash; slash = strchr(slash + 1, '/')) {
|
|
/* Expand dirname to the new prefix, not including the trailing slash: */
|
|
strbuf_add(&dirname, refname + dirname.len, slash - refname - dirname.len);
|
|
|
|
/*
|
|
* We are still at a leading dir of the refname (e.g.,
|
|
* "refs/foo"; if there is a reference with that name,
|
|
* it is a conflict, *unless* it is in skip.
|
|
*/
|
|
if (dir) {
|
|
pos = search_ref_dir(dir, dirname.buf, dirname.len);
|
|
if (pos >= 0 &&
|
|
(!skip || !string_list_has_string(skip, dirname.buf))) {
|
|
/*
|
|
* We found a reference whose name is
|
|
* a proper prefix of refname; e.g.,
|
|
* "refs/foo", and is not in skip.
|
|
*/
|
|
strbuf_addf(err, "'%s' exists; cannot create '%s'",
|
|
dirname.buf, refname);
|
|
goto cleanup;
|
|
}
|
|
}
|
|
|
|
if (extras && string_list_has_string(extras, dirname.buf) &&
|
|
(!skip || !string_list_has_string(skip, dirname.buf))) {
|
|
strbuf_addf(err, "cannot process '%s' and '%s' at the same time",
|
|
refname, dirname.buf);
|
|
goto cleanup;
|
|
}
|
|
|
|
/*
|
|
* Otherwise, we can try to continue our search with
|
|
* the next component. So try to look up the
|
|
* directory, e.g., "refs/foo/". If we come up empty,
|
|
* we know there is nothing under this whole prefix,
|
|
* but even in that case we still have to continue the
|
|
* search for conflicts with extras.
|
|
*/
|
|
strbuf_addch(&dirname, '/');
|
|
if (dir) {
|
|
pos = search_ref_dir(dir, dirname.buf, dirname.len);
|
|
if (pos < 0) {
|
|
/*
|
|
* There was no directory "refs/foo/",
|
|
* so there is nothing under this
|
|
* whole prefix. So there is no need
|
|
* to continue looking for conflicting
|
|
* references. But we need to continue
|
|
* looking for conflicting extras.
|
|
*/
|
|
dir = NULL;
|
|
} else {
|
|
dir = get_ref_dir(dir->entries[pos]);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We are at the leaf of our refname (e.g., "refs/foo/bar").
|
|
* There is no point in searching for a reference with that
|
|
* name, because a refname isn't considered to conflict with
|
|
* itself. But we still need to check for references whose
|
|
* names are in the "refs/foo/bar/" namespace, because they
|
|
* *do* conflict.
|
|
*/
|
|
strbuf_addstr(&dirname, refname + dirname.len);
|
|
strbuf_addch(&dirname, '/');
|
|
|
|
if (dir) {
|
|
pos = search_ref_dir(dir, dirname.buf, dirname.len);
|
|
|
|
if (pos >= 0) {
|
|
/*
|
|
* We found a directory named "$refname/"
|
|
* (e.g., "refs/foo/bar/"). It is a problem
|
|
* iff it contains any ref that is not in
|
|
* "skip".
|
|
*/
|
|
struct nonmatching_ref_data data;
|
|
|
|
data.skip = skip;
|
|
data.conflicting_refname = NULL;
|
|
dir = get_ref_dir(dir->entries[pos]);
|
|
sort_ref_dir(dir);
|
|
if (do_for_each_entry_in_dir(dir, 0, nonmatching_ref_fn, &data)) {
|
|
strbuf_addf(err, "'%s' exists; cannot create '%s'",
|
|
data.conflicting_refname, refname);
|
|
goto cleanup;
|
|
}
|
|
}
|
|
}
|
|
|
|
extra_refname = find_descendant_ref(dirname.buf, extras, skip);
|
|
if (extra_refname)
|
|
strbuf_addf(err, "cannot process '%s' and '%s' at the same time",
|
|
refname, extra_refname);
|
|
else
|
|
ret = 0;
|
|
|
|
cleanup:
|
|
strbuf_release(&dirname);
|
|
return ret;
|
|
}
|
|
|
|
struct packed_ref_cache {
|
|
struct ref_entry *root;
|
|
|
|
/*
|
|
* Count of references to the data structure in this instance,
|
|
* including the pointer from ref_cache::packed if any. The
|
|
* data will not be freed as long as the reference count is
|
|
* nonzero.
|
|
*/
|
|
unsigned int referrers;
|
|
|
|
/*
|
|
* Iff the packed-refs file associated with this instance is
|
|
* currently locked for writing, this points at the associated
|
|
* lock (which is owned by somebody else). The referrer count
|
|
* is also incremented when the file is locked and decremented
|
|
* when it is unlocked.
|
|
*/
|
|
struct lock_file *lock;
|
|
|
|
/* The metadata from when this packed-refs cache was read */
|
|
struct stat_validity validity;
|
|
};
|
|
|
|
/*
|
|
* Future: need to be in "struct repository"
|
|
* when doing a full libification.
|
|
*/
|
|
static struct ref_cache {
|
|
struct ref_cache *next;
|
|
struct ref_entry *loose;
|
|
struct packed_ref_cache *packed;
|
|
/*
|
|
* The submodule name, or "" for the main repo. We allocate
|
|
* length 1 rather than FLEX_ARRAY so that the main ref_cache
|
|
* is initialized correctly.
|
|
*/
|
|
char name[1];
|
|
} ref_cache, *submodule_ref_caches;
|
|
|
|
/* Lock used for the main packed-refs file: */
|
|
static struct lock_file packlock;
|
|
|
|
/*
|
|
* Increment the reference count of *packed_refs.
|
|
*/
|
|
static void acquire_packed_ref_cache(struct packed_ref_cache *packed_refs)
|
|
{
|
|
packed_refs->referrers++;
|
|
}
|
|
|
|
/*
|
|
* Decrease the reference count of *packed_refs. If it goes to zero,
|
|
* free *packed_refs and return true; otherwise return false.
|
|
*/
|
|
static int release_packed_ref_cache(struct packed_ref_cache *packed_refs)
|
|
{
|
|
if (!--packed_refs->referrers) {
|
|
free_ref_entry(packed_refs->root);
|
|
stat_validity_clear(&packed_refs->validity);
|
|
free(packed_refs);
|
|
return 1;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static void clear_packed_ref_cache(struct ref_cache *refs)
|
|
{
|
|
if (refs->packed) {
|
|
struct packed_ref_cache *packed_refs = refs->packed;
|
|
|
|
if (packed_refs->lock)
|
|
die("internal error: packed-ref cache cleared while locked");
|
|
refs->packed = NULL;
|
|
release_packed_ref_cache(packed_refs);
|
|
}
|
|
}
|
|
|
|
static void clear_loose_ref_cache(struct ref_cache *refs)
|
|
{
|
|
if (refs->loose) {
|
|
free_ref_entry(refs->loose);
|
|
refs->loose = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Create a new submodule ref cache and add it to the internal
|
|
* set of caches.
|
|
*/
|
|
static struct ref_cache *create_ref_cache(const char *submodule)
|
|
{
|
|
struct ref_cache *refs;
|
|
if (!submodule)
|
|
submodule = "";
|
|
FLEX_ALLOC_STR(refs, name, submodule);
|
|
refs->next = submodule_ref_caches;
|
|
submodule_ref_caches = refs;
|
|
return refs;
|
|
}
|
|
|
|
static struct ref_cache *lookup_ref_cache(const char *submodule)
|
|
{
|
|
struct ref_cache *refs;
|
|
|
|
if (!submodule || !*submodule)
|
|
return &ref_cache;
|
|
|
|
for (refs = submodule_ref_caches; refs; refs = refs->next)
|
|
if (!strcmp(submodule, refs->name))
|
|
return refs;
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Return a pointer to a ref_cache for the specified submodule. For
|
|
* the main repository, use submodule==NULL. The returned structure
|
|
* will be allocated and initialized but not necessarily populated; it
|
|
* should not be freed.
|
|
*/
|
|
static struct ref_cache *get_ref_cache(const char *submodule)
|
|
{
|
|
struct ref_cache *refs = lookup_ref_cache(submodule);
|
|
if (!refs)
|
|
refs = create_ref_cache(submodule);
|
|
return refs;
|
|
}
|
|
|
|
/* The length of a peeled reference line in packed-refs, including EOL: */
|
|
#define PEELED_LINE_LENGTH 42
|
|
|
|
/*
|
|
* The packed-refs header line that we write out. Perhaps other
|
|
* traits will be added later. The trailing space is required.
|
|
*/
|
|
static const char PACKED_REFS_HEADER[] =
|
|
"# pack-refs with: peeled fully-peeled \n";
|
|
|
|
/*
|
|
* Parse one line from a packed-refs file. Write the SHA1 to sha1.
|
|
* Return a pointer to the refname within the line (null-terminated),
|
|
* or NULL if there was a problem.
|
|
*/
|
|
static const char *parse_ref_line(struct strbuf *line, unsigned char *sha1)
|
|
{
|
|
const char *ref;
|
|
|
|
/*
|
|
* 42: the answer to everything.
|
|
*
|
|
* In this case, it happens to be the answer to
|
|
* 40 (length of sha1 hex representation)
|
|
* +1 (space in between hex and name)
|
|
* +1 (newline at the end of the line)
|
|
*/
|
|
if (line->len <= 42)
|
|
return NULL;
|
|
|
|
if (get_sha1_hex(line->buf, sha1) < 0)
|
|
return NULL;
|
|
if (!isspace(line->buf[40]))
|
|
return NULL;
|
|
|
|
ref = line->buf + 41;
|
|
if (isspace(*ref))
|
|
return NULL;
|
|
|
|
if (line->buf[line->len - 1] != '\n')
|
|
return NULL;
|
|
line->buf[--line->len] = 0;
|
|
|
|
return ref;
|
|
}
|
|
|
|
/*
|
|
* Read f, which is a packed-refs file, into dir.
|
|
*
|
|
* A comment line of the form "# pack-refs with: " may contain zero or
|
|
* more traits. We interpret the traits as follows:
|
|
*
|
|
* No traits:
|
|
*
|
|
* Probably no references are peeled. But if the file contains a
|
|
* peeled value for a reference, we will use it.
|
|
*
|
|
* peeled:
|
|
*
|
|
* References under "refs/tags/", if they *can* be peeled, *are*
|
|
* peeled in this file. References outside of "refs/tags/" are
|
|
* probably not peeled even if they could have been, but if we find
|
|
* a peeled value for such a reference we will use it.
|
|
*
|
|
* fully-peeled:
|
|
*
|
|
* All references in the file that can be peeled are peeled.
|
|
* Inversely (and this is more important), any references in the
|
|
* file for which no peeled value is recorded is not peelable. This
|
|
* trait should typically be written alongside "peeled" for
|
|
* compatibility with older clients, but we do not require it
|
|
* (i.e., "peeled" is a no-op if "fully-peeled" is set).
|
|
*/
|
|
static void read_packed_refs(FILE *f, struct ref_dir *dir)
|
|
{
|
|
struct ref_entry *last = NULL;
|
|
struct strbuf line = STRBUF_INIT;
|
|
enum { PEELED_NONE, PEELED_TAGS, PEELED_FULLY } peeled = PEELED_NONE;
|
|
|
|
while (strbuf_getwholeline(&line, f, '\n') != EOF) {
|
|
unsigned char sha1[20];
|
|
const char *refname;
|
|
const char *traits;
|
|
|
|
if (skip_prefix(line.buf, "# pack-refs with:", &traits)) {
|
|
if (strstr(traits, " fully-peeled "))
|
|
peeled = PEELED_FULLY;
|
|
else if (strstr(traits, " peeled "))
|
|
peeled = PEELED_TAGS;
|
|
/* perhaps other traits later as well */
|
|
continue;
|
|
}
|
|
|
|
refname = parse_ref_line(&line, sha1);
|
|
if (refname) {
|
|
int flag = REF_ISPACKED;
|
|
|
|
if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
|
|
if (!refname_is_safe(refname))
|
|
die("packed refname is dangerous: %s", refname);
|
|
hashclr(sha1);
|
|
flag |= REF_BAD_NAME | REF_ISBROKEN;
|
|
}
|
|
last = create_ref_entry(refname, sha1, flag, 0);
|
|
if (peeled == PEELED_FULLY ||
|
|
(peeled == PEELED_TAGS && starts_with(refname, "refs/tags/")))
|
|
last->flag |= REF_KNOWS_PEELED;
|
|
add_ref(dir, last);
|
|
continue;
|
|
}
|
|
if (last &&
|
|
line.buf[0] == '^' &&
|
|
line.len == PEELED_LINE_LENGTH &&
|
|
line.buf[PEELED_LINE_LENGTH - 1] == '\n' &&
|
|
!get_sha1_hex(line.buf + 1, sha1)) {
|
|
hashcpy(last->u.value.peeled.hash, sha1);
|
|
/*
|
|
* Regardless of what the file header said,
|
|
* we definitely know the value of *this*
|
|
* reference:
|
|
*/
|
|
last->flag |= REF_KNOWS_PEELED;
|
|
}
|
|
}
|
|
|
|
strbuf_release(&line);
|
|
}
|
|
|
|
/*
|
|
* Get the packed_ref_cache for the specified ref_cache, creating it
|
|
* if necessary.
|
|
*/
|
|
static struct packed_ref_cache *get_packed_ref_cache(struct ref_cache *refs)
|
|
{
|
|
char *packed_refs_file;
|
|
|
|
if (*refs->name)
|
|
packed_refs_file = git_pathdup_submodule(refs->name, "packed-refs");
|
|
else
|
|
packed_refs_file = git_pathdup("packed-refs");
|
|
|
|
if (refs->packed &&
|
|
!stat_validity_check(&refs->packed->validity, packed_refs_file))
|
|
clear_packed_ref_cache(refs);
|
|
|
|
if (!refs->packed) {
|
|
FILE *f;
|
|
|
|
refs->packed = xcalloc(1, sizeof(*refs->packed));
|
|
acquire_packed_ref_cache(refs->packed);
|
|
refs->packed->root = create_dir_entry(refs, "", 0, 0);
|
|
f = fopen(packed_refs_file, "r");
|
|
if (f) {
|
|
stat_validity_update(&refs->packed->validity, fileno(f));
|
|
read_packed_refs(f, get_ref_dir(refs->packed->root));
|
|
fclose(f);
|
|
}
|
|
}
|
|
free(packed_refs_file);
|
|
return refs->packed;
|
|
}
|
|
|
|
static struct ref_dir *get_packed_ref_dir(struct packed_ref_cache *packed_ref_cache)
|
|
{
|
|
return get_ref_dir(packed_ref_cache->root);
|
|
}
|
|
|
|
static struct ref_dir *get_packed_refs(struct ref_cache *refs)
|
|
{
|
|
return get_packed_ref_dir(get_packed_ref_cache(refs));
|
|
}
|
|
|
|
/*
|
|
* Add a reference to the in-memory packed reference cache. This may
|
|
* only be called while the packed-refs file is locked (see
|
|
* lock_packed_refs()). To actually write the packed-refs file, call
|
|
* commit_packed_refs().
|
|
*/
|
|
static void add_packed_ref(const char *refname, const unsigned char *sha1)
|
|
{
|
|
struct packed_ref_cache *packed_ref_cache =
|
|
get_packed_ref_cache(&ref_cache);
|
|
|
|
if (!packed_ref_cache->lock)
|
|
die("internal error: packed refs not locked");
|
|
add_ref(get_packed_ref_dir(packed_ref_cache),
|
|
create_ref_entry(refname, sha1, REF_ISPACKED, 1));
|
|
}
|
|
|
|
/*
|
|
* Read the loose references from the namespace dirname into dir
|
|
* (without recursing). dirname must end with '/'. dir must be the
|
|
* directory entry corresponding to dirname.
|
|
*/
|
|
static void read_loose_refs(const char *dirname, struct ref_dir *dir)
|
|
{
|
|
struct ref_cache *refs = dir->ref_cache;
|
|
DIR *d;
|
|
struct dirent *de;
|
|
int dirnamelen = strlen(dirname);
|
|
struct strbuf refname;
|
|
struct strbuf path = STRBUF_INIT;
|
|
size_t path_baselen;
|
|
|
|
if (*refs->name)
|
|
strbuf_git_path_submodule(&path, refs->name, "%s", dirname);
|
|
else
|
|
strbuf_git_path(&path, "%s", dirname);
|
|
path_baselen = path.len;
|
|
|
|
d = opendir(path.buf);
|
|
if (!d) {
|
|
strbuf_release(&path);
|
|
return;
|
|
}
|
|
|
|
strbuf_init(&refname, dirnamelen + 257);
|
|
strbuf_add(&refname, dirname, dirnamelen);
|
|
|
|
while ((de = readdir(d)) != NULL) {
|
|
unsigned char sha1[20];
|
|
struct stat st;
|
|
int flag;
|
|
|
|
if (de->d_name[0] == '.')
|
|
continue;
|
|
if (ends_with(de->d_name, ".lock"))
|
|
continue;
|
|
strbuf_addstr(&refname, de->d_name);
|
|
strbuf_addstr(&path, de->d_name);
|
|
if (stat(path.buf, &st) < 0) {
|
|
; /* silently ignore */
|
|
} else if (S_ISDIR(st.st_mode)) {
|
|
strbuf_addch(&refname, '/');
|
|
add_entry_to_dir(dir,
|
|
create_dir_entry(refs, refname.buf,
|
|
refname.len, 1));
|
|
} else {
|
|
int read_ok;
|
|
|
|
if (*refs->name) {
|
|
hashclr(sha1);
|
|
flag = 0;
|
|
read_ok = !resolve_gitlink_ref(refs->name,
|
|
refname.buf, sha1);
|
|
} else {
|
|
read_ok = !read_ref_full(refname.buf,
|
|
RESOLVE_REF_READING,
|
|
sha1, &flag);
|
|
}
|
|
|
|
if (!read_ok) {
|
|
hashclr(sha1);
|
|
flag |= REF_ISBROKEN;
|
|
} else if (is_null_sha1(sha1)) {
|
|
/*
|
|
* It is so astronomically unlikely
|
|
* that NULL_SHA1 is the SHA-1 of an
|
|
* actual object that we consider its
|
|
* appearance in a loose reference
|
|
* file to be repo corruption
|
|
* (probably due to a software bug).
|
|
*/
|
|
flag |= REF_ISBROKEN;
|
|
}
|
|
|
|
if (check_refname_format(refname.buf,
|
|
REFNAME_ALLOW_ONELEVEL)) {
|
|
if (!refname_is_safe(refname.buf))
|
|
die("loose refname is dangerous: %s", refname.buf);
|
|
hashclr(sha1);
|
|
flag |= REF_BAD_NAME | REF_ISBROKEN;
|
|
}
|
|
add_entry_to_dir(dir,
|
|
create_ref_entry(refname.buf, sha1, flag, 0));
|
|
}
|
|
strbuf_setlen(&refname, dirnamelen);
|
|
strbuf_setlen(&path, path_baselen);
|
|
}
|
|
strbuf_release(&refname);
|
|
strbuf_release(&path);
|
|
closedir(d);
|
|
}
|
|
|
|
static struct ref_dir *get_loose_refs(struct ref_cache *refs)
|
|
{
|
|
if (!refs->loose) {
|
|
/*
|
|
* Mark the top-level directory complete because we
|
|
* are about to read the only subdirectory that can
|
|
* hold references:
|
|
*/
|
|
refs->loose = create_dir_entry(refs, "", 0, 0);
|
|
/*
|
|
* Create an incomplete entry for "refs/":
|
|
*/
|
|
add_entry_to_dir(get_ref_dir(refs->loose),
|
|
create_dir_entry(refs, "refs/", 5, 1));
|
|
}
|
|
return get_ref_dir(refs->loose);
|
|
}
|
|
|
|
/* We allow "recursive" symbolic refs. Only within reason, though */
|
|
#define MAXDEPTH 5
|
|
#define MAXREFLEN (1024)
|
|
|
|
/*
|
|
* Called by resolve_gitlink_ref_recursive() after it failed to read
|
|
* from the loose refs in ref_cache refs. Find <refname> in the
|
|
* packed-refs file for the submodule.
|
|
*/
|
|
static int resolve_gitlink_packed_ref(struct ref_cache *refs,
|
|
const char *refname, unsigned char *sha1)
|
|
{
|
|
struct ref_entry *ref;
|
|
struct ref_dir *dir = get_packed_refs(refs);
|
|
|
|
ref = find_ref(dir, refname);
|
|
if (ref == NULL)
|
|
return -1;
|
|
|
|
hashcpy(sha1, ref->u.value.oid.hash);
|
|
return 0;
|
|
}
|
|
|
|
static int resolve_gitlink_ref_recursive(struct ref_cache *refs,
|
|
const char *refname, unsigned char *sha1,
|
|
int recursion)
|
|
{
|
|
int fd, len;
|
|
char buffer[128], *p;
|
|
char *path;
|
|
|
|
if (recursion > MAXDEPTH || strlen(refname) > MAXREFLEN)
|
|
return -1;
|
|
path = *refs->name
|
|
? git_pathdup_submodule(refs->name, "%s", refname)
|
|
: git_pathdup("%s", refname);
|
|
fd = open(path, O_RDONLY);
|
|
free(path);
|
|
if (fd < 0)
|
|
return resolve_gitlink_packed_ref(refs, refname, sha1);
|
|
|
|
len = read(fd, buffer, sizeof(buffer)-1);
|
|
close(fd);
|
|
if (len < 0)
|
|
return -1;
|
|
while (len && isspace(buffer[len-1]))
|
|
len--;
|
|
buffer[len] = 0;
|
|
|
|
/* Was it a detached head or an old-fashioned symlink? */
|
|
if (!get_sha1_hex(buffer, sha1))
|
|
return 0;
|
|
|
|
/* Symref? */
|
|
if (strncmp(buffer, "ref:", 4))
|
|
return -1;
|
|
p = buffer + 4;
|
|
while (isspace(*p))
|
|
p++;
|
|
|
|
return resolve_gitlink_ref_recursive(refs, p, sha1, recursion+1);
|
|
}
|
|
|
|
int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *sha1)
|
|
{
|
|
int len = strlen(path), retval;
|
|
struct strbuf submodule = STRBUF_INIT;
|
|
struct ref_cache *refs;
|
|
|
|
while (len && path[len-1] == '/')
|
|
len--;
|
|
if (!len)
|
|
return -1;
|
|
|
|
strbuf_add(&submodule, path, len);
|
|
refs = lookup_ref_cache(submodule.buf);
|
|
if (!refs) {
|
|
if (!is_nonbare_repository_dir(&submodule)) {
|
|
strbuf_release(&submodule);
|
|
return -1;
|
|
}
|
|
refs = create_ref_cache(submodule.buf);
|
|
}
|
|
strbuf_release(&submodule);
|
|
|
|
retval = resolve_gitlink_ref_recursive(refs, refname, sha1, 0);
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* Return the ref_entry for the given refname from the packed
|
|
* references. If it does not exist, return NULL.
|
|
*/
|
|
static struct ref_entry *get_packed_ref(const char *refname)
|
|
{
|
|
return find_ref(get_packed_refs(&ref_cache), refname);
|
|
}
|
|
|
|
/*
|
|
* A loose ref file doesn't exist; check for a packed ref. The
|
|
* options are forwarded from resolve_safe_unsafe().
|
|
*/
|
|
static int resolve_missing_loose_ref(const char *refname,
|
|
int resolve_flags,
|
|
unsigned char *sha1,
|
|
int *flags)
|
|
{
|
|
struct ref_entry *entry;
|
|
|
|
/*
|
|
* The loose reference file does not exist; check for a packed
|
|
* reference.
|
|
*/
|
|
entry = get_packed_ref(refname);
|
|
if (entry) {
|
|
hashcpy(sha1, entry->u.value.oid.hash);
|
|
if (flags)
|
|
*flags |= REF_ISPACKED;
|
|
return 0;
|
|
}
|
|
/* The reference is not a packed reference, either. */
|
|
if (resolve_flags & RESOLVE_REF_READING) {
|
|
errno = ENOENT;
|
|
return -1;
|
|
} else {
|
|
hashclr(sha1);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* This function needs to return a meaningful errno on failure */
|
|
static const char *resolve_ref_1(const char *refname,
|
|
int resolve_flags,
|
|
unsigned char *sha1,
|
|
int *flags,
|
|
struct strbuf *sb_refname,
|
|
struct strbuf *sb_path,
|
|
struct strbuf *sb_contents)
|
|
{
|
|
int depth = MAXDEPTH;
|
|
int bad_name = 0;
|
|
|
|
if (flags)
|
|
*flags = 0;
|
|
|
|
if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
|
|
if (flags)
|
|
*flags |= REF_BAD_NAME;
|
|
|
|
if (!(resolve_flags & RESOLVE_REF_ALLOW_BAD_NAME) ||
|
|
!refname_is_safe(refname)) {
|
|
errno = EINVAL;
|
|
return NULL;
|
|
}
|
|
/*
|
|
* dwim_ref() uses REF_ISBROKEN to distinguish between
|
|
* missing refs and refs that were present but invalid,
|
|
* to complain about the latter to stderr.
|
|
*
|
|
* We don't know whether the ref exists, so don't set
|
|
* REF_ISBROKEN yet.
|
|
*/
|
|
bad_name = 1;
|
|
}
|
|
for (;;) {
|
|
const char *path;
|
|
struct stat st;
|
|
char *buf;
|
|
int fd;
|
|
|
|
if (--depth < 0) {
|
|
errno = ELOOP;
|
|
return NULL;
|
|
}
|
|
|
|
strbuf_reset(sb_path);
|
|
strbuf_git_path(sb_path, "%s", refname);
|
|
path = sb_path->buf;
|
|
|
|
/*
|
|
* We might have to loop back here to avoid a race
|
|
* condition: first we lstat() the file, then we try
|
|
* to read it as a link or as a file. But if somebody
|
|
* changes the type of the file (file <-> directory
|
|
* <-> symlink) between the lstat() and reading, then
|
|
* we don't want to report that as an error but rather
|
|
* try again starting with the lstat().
|
|
*/
|
|
stat_ref:
|
|
if (lstat(path, &st) < 0) {
|
|
if (errno != ENOENT)
|
|
return NULL;
|
|
if (resolve_missing_loose_ref(refname, resolve_flags,
|
|
sha1, flags))
|
|
return NULL;
|
|
if (bad_name) {
|
|
hashclr(sha1);
|
|
if (flags)
|
|
*flags |= REF_ISBROKEN;
|
|
}
|
|
return refname;
|
|
}
|
|
|
|
/* Follow "normalized" - ie "refs/.." symlinks by hand */
|
|
if (S_ISLNK(st.st_mode)) {
|
|
strbuf_reset(sb_contents);
|
|
if (strbuf_readlink(sb_contents, path, 0) < 0) {
|
|
if (errno == ENOENT || errno == EINVAL)
|
|
/* inconsistent with lstat; retry */
|
|
goto stat_ref;
|
|
else
|
|
return NULL;
|
|
}
|
|
if (starts_with(sb_contents->buf, "refs/") &&
|
|
!check_refname_format(sb_contents->buf, 0)) {
|
|
strbuf_swap(sb_refname, sb_contents);
|
|
refname = sb_refname->buf;
|
|
if (flags)
|
|
*flags |= REF_ISSYMREF;
|
|
if (resolve_flags & RESOLVE_REF_NO_RECURSE) {
|
|
hashclr(sha1);
|
|
return refname;
|
|
}
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/* Is it a directory? */
|
|
if (S_ISDIR(st.st_mode)) {
|
|
errno = EISDIR;
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Anything else, just open it and try to use it as
|
|
* a ref
|
|
*/
|
|
fd = open(path, O_RDONLY);
|
|
if (fd < 0) {
|
|
if (errno == ENOENT)
|
|
/* inconsistent with lstat; retry */
|
|
goto stat_ref;
|
|
else
|
|
return NULL;
|
|
}
|
|
strbuf_reset(sb_contents);
|
|
if (strbuf_read(sb_contents, fd, 256) < 0) {
|
|
int save_errno = errno;
|
|
close(fd);
|
|
errno = save_errno;
|
|
return NULL;
|
|
}
|
|
close(fd);
|
|
strbuf_rtrim(sb_contents);
|
|
|
|
/*
|
|
* Is it a symbolic ref?
|
|
*/
|
|
if (!starts_with(sb_contents->buf, "ref:")) {
|
|
/*
|
|
* Please note that FETCH_HEAD has a second
|
|
* line containing other data.
|
|
*/
|
|
if (get_sha1_hex(sb_contents->buf, sha1) ||
|
|
(sb_contents->buf[40] != '\0' && !isspace(sb_contents->buf[40]))) {
|
|
if (flags)
|
|
*flags |= REF_ISBROKEN;
|
|
errno = EINVAL;
|
|
return NULL;
|
|
}
|
|
if (bad_name) {
|
|
hashclr(sha1);
|
|
if (flags)
|
|
*flags |= REF_ISBROKEN;
|
|
}
|
|
return refname;
|
|
}
|
|
if (flags)
|
|
*flags |= REF_ISSYMREF;
|
|
buf = sb_contents->buf + 4;
|
|
while (isspace(*buf))
|
|
buf++;
|
|
strbuf_reset(sb_refname);
|
|
strbuf_addstr(sb_refname, buf);
|
|
refname = sb_refname->buf;
|
|
if (resolve_flags & RESOLVE_REF_NO_RECURSE) {
|
|
hashclr(sha1);
|
|
return refname;
|
|
}
|
|
if (check_refname_format(buf, REFNAME_ALLOW_ONELEVEL)) {
|
|
if (flags)
|
|
*flags |= REF_ISBROKEN;
|
|
|
|
if (!(resolve_flags & RESOLVE_REF_ALLOW_BAD_NAME) ||
|
|
!refname_is_safe(buf)) {
|
|
errno = EINVAL;
|
|
return NULL;
|
|
}
|
|
bad_name = 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
const char *resolve_ref_unsafe(const char *refname, int resolve_flags,
|
|
unsigned char *sha1, int *flags)
|
|
{
|
|
static struct strbuf sb_refname = STRBUF_INIT;
|
|
struct strbuf sb_contents = STRBUF_INIT;
|
|
struct strbuf sb_path = STRBUF_INIT;
|
|
const char *ret;
|
|
|
|
ret = resolve_ref_1(refname, resolve_flags, sha1, flags,
|
|
&sb_refname, &sb_path, &sb_contents);
|
|
strbuf_release(&sb_path);
|
|
strbuf_release(&sb_contents);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Peel the entry (if possible) and return its new peel_status. If
|
|
* repeel is true, re-peel the entry even if there is an old peeled
|
|
* value that is already stored in it.
|
|
*
|
|
* It is OK to call this function with a packed reference entry that
|
|
* might be stale and might even refer to an object that has since
|
|
* been garbage-collected. In such a case, if the entry has
|
|
* REF_KNOWS_PEELED then leave the status unchanged and return
|
|
* PEEL_PEELED or PEEL_NON_TAG; otherwise, return PEEL_INVALID.
|
|
*/
|
|
static enum peel_status peel_entry(struct ref_entry *entry, int repeel)
|
|
{
|
|
enum peel_status status;
|
|
|
|
if (entry->flag & REF_KNOWS_PEELED) {
|
|
if (repeel) {
|
|
entry->flag &= ~REF_KNOWS_PEELED;
|
|
oidclr(&entry->u.value.peeled);
|
|
} else {
|
|
return is_null_oid(&entry->u.value.peeled) ?
|
|
PEEL_NON_TAG : PEEL_PEELED;
|
|
}
|
|
}
|
|
if (entry->flag & REF_ISBROKEN)
|
|
return PEEL_BROKEN;
|
|
if (entry->flag & REF_ISSYMREF)
|
|
return PEEL_IS_SYMREF;
|
|
|
|
status = peel_object(entry->u.value.oid.hash, entry->u.value.peeled.hash);
|
|
if (status == PEEL_PEELED || status == PEEL_NON_TAG)
|
|
entry->flag |= REF_KNOWS_PEELED;
|
|
return status;
|
|
}
|
|
|
|
int peel_ref(const char *refname, unsigned char *sha1)
|
|
{
|
|
int flag;
|
|
unsigned char base[20];
|
|
|
|
if (current_ref && (current_ref->name == refname
|
|
|| !strcmp(current_ref->name, refname))) {
|
|
if (peel_entry(current_ref, 0))
|
|
return -1;
|
|
hashcpy(sha1, current_ref->u.value.peeled.hash);
|
|
return 0;
|
|
}
|
|
|
|
if (read_ref_full(refname, RESOLVE_REF_READING, base, &flag))
|
|
return -1;
|
|
|
|
/*
|
|
* If the reference is packed, read its ref_entry from the
|
|
* cache in the hope that we already know its peeled value.
|
|
* We only try this optimization on packed references because
|
|
* (a) forcing the filling of the loose reference cache could
|
|
* be expensive and (b) loose references anyway usually do not
|
|
* have REF_KNOWS_PEELED.
|
|
*/
|
|
if (flag & REF_ISPACKED) {
|
|
struct ref_entry *r = get_packed_ref(refname);
|
|
if (r) {
|
|
if (peel_entry(r, 0))
|
|
return -1;
|
|
hashcpy(sha1, r->u.value.peeled.hash);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return peel_object(base, sha1);
|
|
}
|
|
|
|
/*
|
|
* Call fn for each reference in the specified ref_cache, omitting
|
|
* references not in the containing_dir of base. fn is called for all
|
|
* references, including broken ones. If fn ever returns a non-zero
|
|
* value, stop the iteration and return that value; otherwise, return
|
|
* 0.
|
|
*/
|
|
static int do_for_each_entry(struct ref_cache *refs, const char *base,
|
|
each_ref_entry_fn fn, void *cb_data)
|
|
{
|
|
struct packed_ref_cache *packed_ref_cache;
|
|
struct ref_dir *loose_dir;
|
|
struct ref_dir *packed_dir;
|
|
int retval = 0;
|
|
|
|
/*
|
|
* We must make sure that all loose refs are read before accessing the
|
|
* packed-refs file; this avoids a race condition in which loose refs
|
|
* are migrated to the packed-refs file by a simultaneous process, but
|
|
* our in-memory view is from before the migration. get_packed_ref_cache()
|
|
* takes care of making sure our view is up to date with what is on
|
|
* disk.
|
|
*/
|
|
loose_dir = get_loose_refs(refs);
|
|
if (base && *base) {
|
|
loose_dir = find_containing_dir(loose_dir, base, 0);
|
|
}
|
|
if (loose_dir)
|
|
prime_ref_dir(loose_dir);
|
|
|
|
packed_ref_cache = get_packed_ref_cache(refs);
|
|
acquire_packed_ref_cache(packed_ref_cache);
|
|
packed_dir = get_packed_ref_dir(packed_ref_cache);
|
|
if (base && *base) {
|
|
packed_dir = find_containing_dir(packed_dir, base, 0);
|
|
}
|
|
|
|
if (packed_dir && loose_dir) {
|
|
sort_ref_dir(packed_dir);
|
|
sort_ref_dir(loose_dir);
|
|
retval = do_for_each_entry_in_dirs(
|
|
packed_dir, loose_dir, fn, cb_data);
|
|
} else if (packed_dir) {
|
|
sort_ref_dir(packed_dir);
|
|
retval = do_for_each_entry_in_dir(
|
|
packed_dir, 0, fn, cb_data);
|
|
} else if (loose_dir) {
|
|
sort_ref_dir(loose_dir);
|
|
retval = do_for_each_entry_in_dir(
|
|
loose_dir, 0, fn, cb_data);
|
|
}
|
|
|
|
release_packed_ref_cache(packed_ref_cache);
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* Call fn for each reference in the specified ref_cache for which the
|
|
* refname begins with base. If trim is non-zero, then trim that many
|
|
* characters off the beginning of each refname before passing the
|
|
* refname to fn. flags can be DO_FOR_EACH_INCLUDE_BROKEN to include
|
|
* broken references in the iteration. If fn ever returns a non-zero
|
|
* value, stop the iteration and return that value; otherwise, return
|
|
* 0.
|
|
*/
|
|
static int do_for_each_ref(struct ref_cache *refs, const char *base,
|
|
each_ref_fn fn, int trim, int flags, void *cb_data)
|
|
{
|
|
struct ref_entry_cb data;
|
|
data.base = base;
|
|
data.trim = trim;
|
|
data.flags = flags;
|
|
data.fn = fn;
|
|
data.cb_data = cb_data;
|
|
|
|
if (ref_paranoia < 0)
|
|
ref_paranoia = git_env_bool("GIT_REF_PARANOIA", 0);
|
|
if (ref_paranoia)
|
|
data.flags |= DO_FOR_EACH_INCLUDE_BROKEN;
|
|
|
|
return do_for_each_entry(refs, base, do_one_ref, &data);
|
|
}
|
|
|
|
static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data)
|
|
{
|
|
struct object_id oid;
|
|
int flag;
|
|
|
|
if (submodule) {
|
|
if (resolve_gitlink_ref(submodule, "HEAD", oid.hash) == 0)
|
|
return fn("HEAD", &oid, 0, cb_data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
if (!read_ref_full("HEAD", RESOLVE_REF_READING, oid.hash, &flag))
|
|
return fn("HEAD", &oid, flag, cb_data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int head_ref(each_ref_fn fn, void *cb_data)
|
|
{
|
|
return do_head_ref(NULL, fn, cb_data);
|
|
}
|
|
|
|
int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
|
|
{
|
|
return do_head_ref(submodule, fn, cb_data);
|
|
}
|
|
|
|
int for_each_ref(each_ref_fn fn, void *cb_data)
|
|
{
|
|
return do_for_each_ref(&ref_cache, "", fn, 0, 0, cb_data);
|
|
}
|
|
|
|
int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
|
|
{
|
|
return do_for_each_ref(get_ref_cache(submodule), "", fn, 0, 0, cb_data);
|
|
}
|
|
|
|
int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data)
|
|
{
|
|
return do_for_each_ref(&ref_cache, prefix, fn, strlen(prefix), 0, cb_data);
|
|
}
|
|
|
|
int for_each_fullref_in(const char *prefix, each_ref_fn fn, void *cb_data, unsigned int broken)
|
|
{
|
|
unsigned int flag = 0;
|
|
|
|
if (broken)
|
|
flag = DO_FOR_EACH_INCLUDE_BROKEN;
|
|
return do_for_each_ref(&ref_cache, prefix, fn, 0, flag, cb_data);
|
|
}
|
|
|
|
int for_each_ref_in_submodule(const char *submodule, const char *prefix,
|
|
each_ref_fn fn, void *cb_data)
|
|
{
|
|
return do_for_each_ref(get_ref_cache(submodule), prefix, fn, strlen(prefix), 0, cb_data);
|
|
}
|
|
|
|
int for_each_replace_ref(each_ref_fn fn, void *cb_data)
|
|
{
|
|
return do_for_each_ref(&ref_cache, git_replace_ref_base, fn,
|
|
strlen(git_replace_ref_base), 0, cb_data);
|
|
}
|
|
|
|
int for_each_namespaced_ref(each_ref_fn fn, void *cb_data)
|
|
{
|
|
struct strbuf buf = STRBUF_INIT;
|
|
int ret;
|
|
strbuf_addf(&buf, "%srefs/", get_git_namespace());
|
|
ret = do_for_each_ref(&ref_cache, buf.buf, fn, 0, 0, cb_data);
|
|
strbuf_release(&buf);
|
|
return ret;
|
|
}
|
|
|
|
int for_each_rawref(each_ref_fn fn, void *cb_data)
|
|
{
|
|
return do_for_each_ref(&ref_cache, "", fn, 0,
|
|
DO_FOR_EACH_INCLUDE_BROKEN, cb_data);
|
|
}
|
|
|
|
static void unlock_ref(struct ref_lock *lock)
|
|
{
|
|
/* Do not free lock->lk -- atexit() still looks at them */
|
|
if (lock->lk)
|
|
rollback_lock_file(lock->lk);
|
|
free(lock->ref_name);
|
|
free(lock->orig_ref_name);
|
|
free(lock);
|
|
}
|
|
|
|
/*
|
|
* Verify that the reference locked by lock has the value old_sha1.
|
|
* Fail if the reference doesn't exist and mustexist is set. Return 0
|
|
* on success. On error, write an error message to err, set errno, and
|
|
* return a negative value.
|
|
*/
|
|
static int verify_lock(struct ref_lock *lock,
|
|
const unsigned char *old_sha1, int mustexist,
|
|
struct strbuf *err)
|
|
{
|
|
assert(err);
|
|
|
|
if (read_ref_full(lock->ref_name,
|
|
mustexist ? RESOLVE_REF_READING : 0,
|
|
lock->old_oid.hash, NULL)) {
|
|
if (old_sha1) {
|
|
int save_errno = errno;
|
|
strbuf_addf(err, "can't verify ref %s", lock->ref_name);
|
|
errno = save_errno;
|
|
return -1;
|
|
} else {
|
|
hashclr(lock->old_oid.hash);
|
|
return 0;
|
|
}
|
|
}
|
|
if (old_sha1 && hashcmp(lock->old_oid.hash, old_sha1)) {
|
|
strbuf_addf(err, "ref %s is at %s but expected %s",
|
|
lock->ref_name,
|
|
sha1_to_hex(lock->old_oid.hash),
|
|
sha1_to_hex(old_sha1));
|
|
errno = EBUSY;
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int remove_empty_directories(struct strbuf *path)
|
|
{
|
|
/*
|
|
* we want to create a file but there is a directory there;
|
|
* if that is an empty directory (or a directory that contains
|
|
* only empty directories), remove them.
|
|
*/
|
|
return remove_dir_recursively(path, REMOVE_DIR_EMPTY_ONLY);
|
|
}
|
|
|
|
/*
|
|
* Locks a ref returning the lock on success and NULL on failure.
|
|
* On failure errno is set to something meaningful.
|
|
*/
|
|
static struct ref_lock *lock_ref_sha1_basic(const char *refname,
|
|
const unsigned char *old_sha1,
|
|
const struct string_list *extras,
|
|
const struct string_list *skip,
|
|
unsigned int flags, int *type_p,
|
|
struct strbuf *err)
|
|
{
|
|
struct strbuf ref_file = STRBUF_INIT;
|
|
struct strbuf orig_ref_file = STRBUF_INIT;
|
|
const char *orig_refname = refname;
|
|
struct ref_lock *lock;
|
|
int last_errno = 0;
|
|
int type;
|
|
int lflags = 0;
|
|
int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
|
|
int resolve_flags = 0;
|
|
int attempts_remaining = 3;
|
|
|
|
assert(err);
|
|
|
|
lock = xcalloc(1, sizeof(struct ref_lock));
|
|
|
|
if (mustexist)
|
|
resolve_flags |= RESOLVE_REF_READING;
|
|
if (flags & REF_DELETING)
|
|
resolve_flags |= RESOLVE_REF_ALLOW_BAD_NAME;
|
|
if (flags & REF_NODEREF) {
|
|
resolve_flags |= RESOLVE_REF_NO_RECURSE;
|
|
lflags |= LOCK_NO_DEREF;
|
|
}
|
|
|
|
refname = resolve_ref_unsafe(refname, resolve_flags,
|
|
lock->old_oid.hash, &type);
|
|
if (!refname && errno == EISDIR) {
|
|
/*
|
|
* we are trying to lock foo but we used to
|
|
* have foo/bar which now does not exist;
|
|
* it is normal for the empty directory 'foo'
|
|
* to remain.
|
|
*/
|
|
strbuf_git_path(&orig_ref_file, "%s", orig_refname);
|
|
if (remove_empty_directories(&orig_ref_file)) {
|
|
last_errno = errno;
|
|
if (!verify_refname_available_dir(orig_refname, extras, skip,
|
|
get_loose_refs(&ref_cache), err))
|
|
strbuf_addf(err, "there are still refs under '%s'",
|
|
orig_refname);
|
|
goto error_return;
|
|
}
|
|
refname = resolve_ref_unsafe(orig_refname, resolve_flags,
|
|
lock->old_oid.hash, &type);
|
|
}
|
|
if (type_p)
|
|
*type_p = type;
|
|
if (!refname) {
|
|
last_errno = errno;
|
|
if (last_errno != ENOTDIR ||
|
|
!verify_refname_available_dir(orig_refname, extras, skip,
|
|
get_loose_refs(&ref_cache), err))
|
|
strbuf_addf(err, "unable to resolve reference %s: %s",
|
|
orig_refname, strerror(last_errno));
|
|
|
|
goto error_return;
|
|
}
|
|
|
|
if (flags & REF_NODEREF)
|
|
refname = orig_refname;
|
|
|
|
/*
|
|
* If the ref did not exist and we are creating it, make sure
|
|
* there is no existing packed ref whose name begins with our
|
|
* refname, nor a packed ref whose name is a proper prefix of
|
|
* our refname.
|
|
*/
|
|
if (is_null_oid(&lock->old_oid) &&
|
|
verify_refname_available_dir(refname, extras, skip,
|
|
get_packed_refs(&ref_cache), err)) {
|
|
last_errno = ENOTDIR;
|
|
goto error_return;
|
|
}
|
|
|
|
lock->lk = xcalloc(1, sizeof(struct lock_file));
|
|
|
|
lock->ref_name = xstrdup(refname);
|
|
lock->orig_ref_name = xstrdup(orig_refname);
|
|
strbuf_git_path(&ref_file, "%s", refname);
|
|
|
|
retry:
|
|
switch (safe_create_leading_directories_const(ref_file.buf)) {
|
|
case SCLD_OK:
|
|
break; /* success */
|
|
case SCLD_VANISHED:
|
|
if (--attempts_remaining > 0)
|
|
goto retry;
|
|
/* fall through */
|
|
default:
|
|
last_errno = errno;
|
|
strbuf_addf(err, "unable to create directory for %s",
|
|
ref_file.buf);
|
|
goto error_return;
|
|
}
|
|
|
|
if (hold_lock_file_for_update(lock->lk, ref_file.buf, lflags) < 0) {
|
|
last_errno = errno;
|
|
if (errno == ENOENT && --attempts_remaining > 0)
|
|
/*
|
|
* Maybe somebody just deleted one of the
|
|
* directories leading to ref_file. Try
|
|
* again:
|
|
*/
|
|
goto retry;
|
|
else {
|
|
unable_to_lock_message(ref_file.buf, errno, err);
|
|
goto error_return;
|
|
}
|
|
}
|
|
if (verify_lock(lock, old_sha1, mustexist, err)) {
|
|
last_errno = errno;
|
|
goto error_return;
|
|
}
|
|
goto out;
|
|
|
|
error_return:
|
|
unlock_ref(lock);
|
|
lock = NULL;
|
|
|
|
out:
|
|
strbuf_release(&ref_file);
|
|
strbuf_release(&orig_ref_file);
|
|
errno = last_errno;
|
|
return lock;
|
|
}
|
|
|
|
/*
|
|
* Write an entry to the packed-refs file for the specified refname.
|
|
* If peeled is non-NULL, write it as the entry's peeled value.
|
|
*/
|
|
static void write_packed_entry(FILE *fh, char *refname, unsigned char *sha1,
|
|
unsigned char *peeled)
|
|
{
|
|
fprintf_or_die(fh, "%s %s\n", sha1_to_hex(sha1), refname);
|
|
if (peeled)
|
|
fprintf_or_die(fh, "^%s\n", sha1_to_hex(peeled));
|
|
}
|
|
|
|
/*
|
|
* An each_ref_entry_fn that writes the entry to a packed-refs file.
|
|
*/
|
|
static int write_packed_entry_fn(struct ref_entry *entry, void *cb_data)
|
|
{
|
|
enum peel_status peel_status = peel_entry(entry, 0);
|
|
|
|
if (peel_status != PEEL_PEELED && peel_status != PEEL_NON_TAG)
|
|
error("internal error: %s is not a valid packed reference!",
|
|
entry->name);
|
|
write_packed_entry(cb_data, entry->name, entry->u.value.oid.hash,
|
|
peel_status == PEEL_PEELED ?
|
|
entry->u.value.peeled.hash : NULL);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Lock the packed-refs file for writing. Flags is passed to
|
|
* hold_lock_file_for_update(). Return 0 on success. On errors, set
|
|
* errno appropriately and return a nonzero value.
|
|
*/
|
|
static int lock_packed_refs(int flags)
|
|
{
|
|
static int timeout_configured = 0;
|
|
static int timeout_value = 1000;
|
|
|
|
struct packed_ref_cache *packed_ref_cache;
|
|
|
|
if (!timeout_configured) {
|
|
git_config_get_int("core.packedrefstimeout", &timeout_value);
|
|
timeout_configured = 1;
|
|
}
|
|
|
|
if (hold_lock_file_for_update_timeout(
|
|
&packlock, git_path("packed-refs"),
|
|
flags, timeout_value) < 0)
|
|
return -1;
|
|
/*
|
|
* Get the current packed-refs while holding the lock. If the
|
|
* packed-refs file has been modified since we last read it,
|
|
* this will automatically invalidate the cache and re-read
|
|
* the packed-refs file.
|
|
*/
|
|
packed_ref_cache = get_packed_ref_cache(&ref_cache);
|
|
packed_ref_cache->lock = &packlock;
|
|
/* Increment the reference count to prevent it from being freed: */
|
|
acquire_packed_ref_cache(packed_ref_cache);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Write the current version of the packed refs cache from memory to
|
|
* disk. The packed-refs file must already be locked for writing (see
|
|
* lock_packed_refs()). Return zero on success. On errors, set errno
|
|
* and return a nonzero value
|
|
*/
|
|
static int commit_packed_refs(void)
|
|
{
|
|
struct packed_ref_cache *packed_ref_cache =
|
|
get_packed_ref_cache(&ref_cache);
|
|
int error = 0;
|
|
int save_errno = 0;
|
|
FILE *out;
|
|
|
|
if (!packed_ref_cache->lock)
|
|
die("internal error: packed-refs not locked");
|
|
|
|
out = fdopen_lock_file(packed_ref_cache->lock, "w");
|
|
if (!out)
|
|
die_errno("unable to fdopen packed-refs descriptor");
|
|
|
|
fprintf_or_die(out, "%s", PACKED_REFS_HEADER);
|
|
do_for_each_entry_in_dir(get_packed_ref_dir(packed_ref_cache),
|
|
0, write_packed_entry_fn, out);
|
|
|
|
if (commit_lock_file(packed_ref_cache->lock)) {
|
|
save_errno = errno;
|
|
error = -1;
|
|
}
|
|
packed_ref_cache->lock = NULL;
|
|
release_packed_ref_cache(packed_ref_cache);
|
|
errno = save_errno;
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Rollback the lockfile for the packed-refs file, and discard the
|
|
* in-memory packed reference cache. (The packed-refs file will be
|
|
* read anew if it is needed again after this function is called.)
|
|
*/
|
|
static void rollback_packed_refs(void)
|
|
{
|
|
struct packed_ref_cache *packed_ref_cache =
|
|
get_packed_ref_cache(&ref_cache);
|
|
|
|
if (!packed_ref_cache->lock)
|
|
die("internal error: packed-refs not locked");
|
|
rollback_lock_file(packed_ref_cache->lock);
|
|
packed_ref_cache->lock = NULL;
|
|
release_packed_ref_cache(packed_ref_cache);
|
|
clear_packed_ref_cache(&ref_cache);
|
|
}
|
|
|
|
struct ref_to_prune {
|
|
struct ref_to_prune *next;
|
|
unsigned char sha1[20];
|
|
char name[FLEX_ARRAY];
|
|
};
|
|
|
|
struct pack_refs_cb_data {
|
|
unsigned int flags;
|
|
struct ref_dir *packed_refs;
|
|
struct ref_to_prune *ref_to_prune;
|
|
};
|
|
|
|
/*
|
|
* An each_ref_entry_fn that is run over loose references only. If
|
|
* the loose reference can be packed, add an entry in the packed ref
|
|
* cache. If the reference should be pruned, also add it to
|
|
* ref_to_prune in the pack_refs_cb_data.
|
|
*/
|
|
static int pack_if_possible_fn(struct ref_entry *entry, void *cb_data)
|
|
{
|
|
struct pack_refs_cb_data *cb = cb_data;
|
|
enum peel_status peel_status;
|
|
struct ref_entry *packed_entry;
|
|
int is_tag_ref = starts_with(entry->name, "refs/tags/");
|
|
|
|
/* Do not pack per-worktree refs: */
|
|
if (ref_type(entry->name) != REF_TYPE_NORMAL)
|
|
return 0;
|
|
|
|
/* ALWAYS pack tags */
|
|
if (!(cb->flags & PACK_REFS_ALL) && !is_tag_ref)
|
|
return 0;
|
|
|
|
/* Do not pack symbolic or broken refs: */
|
|
if ((entry->flag & REF_ISSYMREF) || !ref_resolves_to_object(entry))
|
|
return 0;
|
|
|
|
/* Add a packed ref cache entry equivalent to the loose entry. */
|
|
peel_status = peel_entry(entry, 1);
|
|
if (peel_status != PEEL_PEELED && peel_status != PEEL_NON_TAG)
|
|
die("internal error peeling reference %s (%s)",
|
|
entry->name, oid_to_hex(&entry->u.value.oid));
|
|
packed_entry = find_ref(cb->packed_refs, entry->name);
|
|
if (packed_entry) {
|
|
/* Overwrite existing packed entry with info from loose entry */
|
|
packed_entry->flag = REF_ISPACKED | REF_KNOWS_PEELED;
|
|
oidcpy(&packed_entry->u.value.oid, &entry->u.value.oid);
|
|
} else {
|
|
packed_entry = create_ref_entry(entry->name, entry->u.value.oid.hash,
|
|
REF_ISPACKED | REF_KNOWS_PEELED, 0);
|
|
add_ref(cb->packed_refs, packed_entry);
|
|
}
|
|
oidcpy(&packed_entry->u.value.peeled, &entry->u.value.peeled);
|
|
|
|
/* Schedule the loose reference for pruning if requested. */
|
|
if ((cb->flags & PACK_REFS_PRUNE)) {
|
|
struct ref_to_prune *n;
|
|
FLEX_ALLOC_STR(n, name, entry->name);
|
|
hashcpy(n->sha1, entry->u.value.oid.hash);
|
|
n->next = cb->ref_to_prune;
|
|
cb->ref_to_prune = n;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Remove empty parents, but spare refs/ and immediate subdirs.
|
|
* Note: munges *name.
|
|
*/
|
|
static void try_remove_empty_parents(char *name)
|
|
{
|
|
char *p, *q;
|
|
int i;
|
|
p = name;
|
|
for (i = 0; i < 2; i++) { /* refs/{heads,tags,...}/ */
|
|
while (*p && *p != '/')
|
|
p++;
|
|
/* tolerate duplicate slashes; see check_refname_format() */
|
|
while (*p == '/')
|
|
p++;
|
|
}
|
|
for (q = p; *q; q++)
|
|
;
|
|
while (1) {
|
|
while (q > p && *q != '/')
|
|
q--;
|
|
while (q > p && *(q-1) == '/')
|
|
q--;
|
|
if (q == p)
|
|
break;
|
|
*q = '\0';
|
|
if (rmdir(git_path("%s", name)))
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* make sure nobody touched the ref, and unlink */
|
|
static void prune_ref(struct ref_to_prune *r)
|
|
{
|
|
struct ref_transaction *transaction;
|
|
struct strbuf err = STRBUF_INIT;
|
|
|
|
if (check_refname_format(r->name, 0))
|
|
return;
|
|
|
|
transaction = ref_transaction_begin(&err);
|
|
if (!transaction ||
|
|
ref_transaction_delete(transaction, r->name, r->sha1,
|
|
REF_ISPRUNING, NULL, &err) ||
|
|
ref_transaction_commit(transaction, &err)) {
|
|
ref_transaction_free(transaction);
|
|
error("%s", err.buf);
|
|
strbuf_release(&err);
|
|
return;
|
|
}
|
|
ref_transaction_free(transaction);
|
|
strbuf_release(&err);
|
|
try_remove_empty_parents(r->name);
|
|
}
|
|
|
|
static void prune_refs(struct ref_to_prune *r)
|
|
{
|
|
while (r) {
|
|
prune_ref(r);
|
|
r = r->next;
|
|
}
|
|
}
|
|
|
|
int pack_refs(unsigned int flags)
|
|
{
|
|
struct pack_refs_cb_data cbdata;
|
|
|
|
memset(&cbdata, 0, sizeof(cbdata));
|
|
cbdata.flags = flags;
|
|
|
|
lock_packed_refs(LOCK_DIE_ON_ERROR);
|
|
cbdata.packed_refs = get_packed_refs(&ref_cache);
|
|
|
|
do_for_each_entry_in_dir(get_loose_refs(&ref_cache), 0,
|
|
pack_if_possible_fn, &cbdata);
|
|
|
|
if (commit_packed_refs())
|
|
die_errno("unable to overwrite old ref-pack file");
|
|
|
|
prune_refs(cbdata.ref_to_prune);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Rewrite the packed-refs file, omitting any refs listed in
|
|
* 'refnames'. On error, leave packed-refs unchanged, write an error
|
|
* message to 'err', and return a nonzero value.
|
|
*
|
|
* The refs in 'refnames' needn't be sorted. `err` must not be NULL.
|
|
*/
|
|
static int repack_without_refs(struct string_list *refnames, struct strbuf *err)
|
|
{
|
|
struct ref_dir *packed;
|
|
struct string_list_item *refname;
|
|
int ret, needs_repacking = 0, removed = 0;
|
|
|
|
assert(err);
|
|
|
|
/* Look for a packed ref */
|
|
for_each_string_list_item(refname, refnames) {
|
|
if (get_packed_ref(refname->string)) {
|
|
needs_repacking = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Avoid locking if we have nothing to do */
|
|
if (!needs_repacking)
|
|
return 0; /* no refname exists in packed refs */
|
|
|
|
if (lock_packed_refs(0)) {
|
|
unable_to_lock_message(git_path("packed-refs"), errno, err);
|
|
return -1;
|
|
}
|
|
packed = get_packed_refs(&ref_cache);
|
|
|
|
/* Remove refnames from the cache */
|
|
for_each_string_list_item(refname, refnames)
|
|
if (remove_entry(packed, refname->string) != -1)
|
|
removed = 1;
|
|
if (!removed) {
|
|
/*
|
|
* All packed entries disappeared while we were
|
|
* acquiring the lock.
|
|
*/
|
|
rollback_packed_refs();
|
|
return 0;
|
|
}
|
|
|
|
/* Write what remains */
|
|
ret = commit_packed_refs();
|
|
if (ret)
|
|
strbuf_addf(err, "unable to overwrite old ref-pack file: %s",
|
|
strerror(errno));
|
|
return ret;
|
|
}
|
|
|
|
static int delete_ref_loose(struct ref_lock *lock, int flag, struct strbuf *err)
|
|
{
|
|
assert(err);
|
|
|
|
if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) {
|
|
/*
|
|
* loose. The loose file name is the same as the
|
|
* lockfile name, minus ".lock":
|
|
*/
|
|
char *loose_filename = get_locked_file_path(lock->lk);
|
|
int res = unlink_or_msg(loose_filename, err);
|
|
free(loose_filename);
|
|
if (res)
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int delete_refs(struct string_list *refnames)
|
|
{
|
|
struct strbuf err = STRBUF_INIT;
|
|
int i, result = 0;
|
|
|
|
if (!refnames->nr)
|
|
return 0;
|
|
|
|
result = repack_without_refs(refnames, &err);
|
|
if (result) {
|
|
/*
|
|
* If we failed to rewrite the packed-refs file, then
|
|
* it is unsafe to try to remove loose refs, because
|
|
* doing so might expose an obsolete packed value for
|
|
* a reference that might even point at an object that
|
|
* has been garbage collected.
|
|
*/
|
|
if (refnames->nr == 1)
|
|
error(_("could not delete reference %s: %s"),
|
|
refnames->items[0].string, err.buf);
|
|
else
|
|
error(_("could not delete references: %s"), err.buf);
|
|
|
|
goto out;
|
|
}
|
|
|
|
for (i = 0; i < refnames->nr; i++) {
|
|
const char *refname = refnames->items[i].string;
|
|
|
|
if (delete_ref(refname, NULL, 0))
|
|
result |= error(_("could not remove reference %s"), refname);
|
|
}
|
|
|
|
out:
|
|
strbuf_release(&err);
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* People using contrib's git-new-workdir have .git/logs/refs ->
|
|
* /some/other/path/.git/logs/refs, and that may live on another device.
|
|
*
|
|
* IOW, to avoid cross device rename errors, the temporary renamed log must
|
|
* live into logs/refs.
|
|
*/
|
|
#define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log"
|
|
|
|
static int rename_tmp_log(const char *newrefname)
|
|
{
|
|
int attempts_remaining = 4;
|
|
struct strbuf path = STRBUF_INIT;
|
|
int ret = -1;
|
|
|
|
retry:
|
|
strbuf_reset(&path);
|
|
strbuf_git_path(&path, "logs/%s", newrefname);
|
|
switch (safe_create_leading_directories_const(path.buf)) {
|
|
case SCLD_OK:
|
|
break; /* success */
|
|
case SCLD_VANISHED:
|
|
if (--attempts_remaining > 0)
|
|
goto retry;
|
|
/* fall through */
|
|
default:
|
|
error("unable to create directory for %s", newrefname);
|
|
goto out;
|
|
}
|
|
|
|
if (rename(git_path(TMP_RENAMED_LOG), path.buf)) {
|
|
if ((errno==EISDIR || errno==ENOTDIR) && --attempts_remaining > 0) {
|
|
/*
|
|
* rename(a, b) when b is an existing
|
|
* directory ought to result in ISDIR, but
|
|
* Solaris 5.8 gives ENOTDIR. Sheesh.
|
|
*/
|
|
if (remove_empty_directories(&path)) {
|
|
error("Directory not empty: logs/%s", newrefname);
|
|
goto out;
|
|
}
|
|
goto retry;
|
|
} else if (errno == ENOENT && --attempts_remaining > 0) {
|
|
/*
|
|
* Maybe another process just deleted one of
|
|
* the directories in the path to newrefname.
|
|
* Try again from the beginning.
|
|
*/
|
|
goto retry;
|
|
} else {
|
|
error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s",
|
|
newrefname, strerror(errno));
|
|
goto out;
|
|
}
|
|
}
|
|
ret = 0;
|
|
out:
|
|
strbuf_release(&path);
|
|
return ret;
|
|
}
|
|
|
|
int verify_refname_available(const char *newname,
|
|
struct string_list *extras,
|
|
struct string_list *skip,
|
|
struct strbuf *err)
|
|
{
|
|
struct ref_dir *packed_refs = get_packed_refs(&ref_cache);
|
|
struct ref_dir *loose_refs = get_loose_refs(&ref_cache);
|
|
|
|
if (verify_refname_available_dir(newname, extras, skip,
|
|
packed_refs, err) ||
|
|
verify_refname_available_dir(newname, extras, skip,
|
|
loose_refs, err))
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int write_ref_to_lockfile(struct ref_lock *lock,
|
|
const unsigned char *sha1, struct strbuf *err);
|
|
static int commit_ref_update(struct ref_lock *lock,
|
|
const unsigned char *sha1, const char *logmsg,
|
|
int flags, struct strbuf *err);
|
|
|
|
int rename_ref(const char *oldrefname, const char *newrefname, const char *logmsg)
|
|
{
|
|
unsigned char sha1[20], orig_sha1[20];
|
|
int flag = 0, logmoved = 0;
|
|
struct ref_lock *lock;
|
|
struct stat loginfo;
|
|
int log = !lstat(git_path("logs/%s", oldrefname), &loginfo);
|
|
const char *symref = NULL;
|
|
struct strbuf err = STRBUF_INIT;
|
|
|
|
if (log && S_ISLNK(loginfo.st_mode))
|
|
return error("reflog for %s is a symlink", oldrefname);
|
|
|
|
symref = resolve_ref_unsafe(oldrefname, RESOLVE_REF_READING,
|
|
orig_sha1, &flag);
|
|
if (flag & REF_ISSYMREF)
|
|
return error("refname %s is a symbolic ref, renaming it is not supported",
|
|
oldrefname);
|
|
if (!symref)
|
|
return error("refname %s not found", oldrefname);
|
|
|
|
if (!rename_ref_available(oldrefname, newrefname))
|
|
return 1;
|
|
|
|
if (log && rename(git_path("logs/%s", oldrefname), git_path(TMP_RENAMED_LOG)))
|
|
return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s",
|
|
oldrefname, strerror(errno));
|
|
|
|
if (delete_ref(oldrefname, orig_sha1, REF_NODEREF)) {
|
|
error("unable to delete old %s", oldrefname);
|
|
goto rollback;
|
|
}
|
|
|
|
if (!read_ref_full(newrefname, RESOLVE_REF_READING, sha1, NULL) &&
|
|
delete_ref(newrefname, sha1, REF_NODEREF)) {
|
|
if (errno==EISDIR) {
|
|
struct strbuf path = STRBUF_INIT;
|
|
int result;
|
|
|
|
strbuf_git_path(&path, "%s", newrefname);
|
|
result = remove_empty_directories(&path);
|
|
strbuf_release(&path);
|
|
|
|
if (result) {
|
|
error("Directory not empty: %s", newrefname);
|
|
goto rollback;
|
|
}
|
|
} else {
|
|
error("unable to delete existing %s", newrefname);
|
|
goto rollback;
|
|
}
|
|
}
|
|
|
|
if (log && rename_tmp_log(newrefname))
|
|
goto rollback;
|
|
|
|
logmoved = log;
|
|
|
|
lock = lock_ref_sha1_basic(newrefname, NULL, NULL, NULL, 0, NULL, &err);
|
|
if (!lock) {
|
|
error("unable to rename '%s' to '%s': %s", oldrefname, newrefname, err.buf);
|
|
strbuf_release(&err);
|
|
goto rollback;
|
|
}
|
|
hashcpy(lock->old_oid.hash, orig_sha1);
|
|
|
|
if (write_ref_to_lockfile(lock, orig_sha1, &err) ||
|
|
commit_ref_update(lock, orig_sha1, logmsg, 0, &err)) {
|
|
error("unable to write current sha1 into %s: %s", newrefname, err.buf);
|
|
strbuf_release(&err);
|
|
goto rollback;
|
|
}
|
|
|
|
return 0;
|
|
|
|
rollback:
|
|
lock = lock_ref_sha1_basic(oldrefname, NULL, NULL, NULL, 0, NULL, &err);
|
|
if (!lock) {
|
|
error("unable to lock %s for rollback: %s", oldrefname, err.buf);
|
|
strbuf_release(&err);
|
|
goto rollbacklog;
|
|
}
|
|
|
|
flag = log_all_ref_updates;
|
|
log_all_ref_updates = 0;
|
|
if (write_ref_to_lockfile(lock, orig_sha1, &err) ||
|
|
commit_ref_update(lock, orig_sha1, NULL, 0, &err)) {
|
|
error("unable to write current sha1 into %s: %s", oldrefname, err.buf);
|
|
strbuf_release(&err);
|
|
}
|
|
log_all_ref_updates = flag;
|
|
|
|
rollbacklog:
|
|
if (logmoved && rename(git_path("logs/%s", newrefname), git_path("logs/%s", oldrefname)))
|
|
error("unable to restore logfile %s from %s: %s",
|
|
oldrefname, newrefname, strerror(errno));
|
|
if (!logmoved && log &&
|
|
rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldrefname)))
|
|
error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s",
|
|
oldrefname, strerror(errno));
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int close_ref(struct ref_lock *lock)
|
|
{
|
|
if (close_lock_file(lock->lk))
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
static int commit_ref(struct ref_lock *lock)
|
|
{
|
|
if (commit_lock_file(lock->lk))
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Create a reflog for a ref. If force_create = 0, the reflog will
|
|
* only be created for certain refs (those for which
|
|
* should_autocreate_reflog returns non-zero. Otherwise, create it
|
|
* regardless of the ref name. Fill in *err and return -1 on failure.
|
|
*/
|
|
static int log_ref_setup(const char *refname, struct strbuf *logfile, struct strbuf *err, int force_create)
|
|
{
|
|
int logfd, oflags = O_APPEND | O_WRONLY;
|
|
|
|
strbuf_git_path(logfile, "logs/%s", refname);
|
|
if (force_create || should_autocreate_reflog(refname)) {
|
|
if (safe_create_leading_directories(logfile->buf) < 0) {
|
|
strbuf_addf(err, "unable to create directory for %s: "
|
|
"%s", logfile->buf, strerror(errno));
|
|
return -1;
|
|
}
|
|
oflags |= O_CREAT;
|
|
}
|
|
|
|
logfd = open(logfile->buf, oflags, 0666);
|
|
if (logfd < 0) {
|
|
if (!(oflags & O_CREAT) && (errno == ENOENT || errno == EISDIR))
|
|
return 0;
|
|
|
|
if (errno == EISDIR) {
|
|
if (remove_empty_directories(logfile)) {
|
|
strbuf_addf(err, "There are still logs under "
|
|
"'%s'", logfile->buf);
|
|
return -1;
|
|
}
|
|
logfd = open(logfile->buf, oflags, 0666);
|
|
}
|
|
|
|
if (logfd < 0) {
|
|
strbuf_addf(err, "unable to append to %s: %s",
|
|
logfile->buf, strerror(errno));
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
adjust_shared_perm(logfile->buf);
|
|
close(logfd);
|
|
return 0;
|
|
}
|
|
|
|
|
|
int safe_create_reflog(const char *refname, int force_create, struct strbuf *err)
|
|
{
|
|
int ret;
|
|
struct strbuf sb = STRBUF_INIT;
|
|
|
|
ret = log_ref_setup(refname, &sb, err, force_create);
|
|
strbuf_release(&sb);
|
|
return ret;
|
|
}
|
|
|
|
static int log_ref_write_fd(int fd, const unsigned char *old_sha1,
|
|
const unsigned char *new_sha1,
|
|
const char *committer, const char *msg)
|
|
{
|
|
int msglen, written;
|
|
unsigned maxlen, len;
|
|
char *logrec;
|
|
|
|
msglen = msg ? strlen(msg) : 0;
|
|
maxlen = strlen(committer) + msglen + 100;
|
|
logrec = xmalloc(maxlen);
|
|
len = xsnprintf(logrec, maxlen, "%s %s %s\n",
|
|
sha1_to_hex(old_sha1),
|
|
sha1_to_hex(new_sha1),
|
|
committer);
|
|
if (msglen)
|
|
len += copy_reflog_msg(logrec + len - 1, msg) - 1;
|
|
|
|
written = len <= maxlen ? write_in_full(fd, logrec, len) : -1;
|
|
free(logrec);
|
|
if (written != len)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int log_ref_write_1(const char *refname, const unsigned char *old_sha1,
|
|
const unsigned char *new_sha1, const char *msg,
|
|
struct strbuf *logfile, int flags,
|
|
struct strbuf *err)
|
|
{
|
|
int logfd, result, oflags = O_APPEND | O_WRONLY;
|
|
|
|
if (log_all_ref_updates < 0)
|
|
log_all_ref_updates = !is_bare_repository();
|
|
|
|
result = log_ref_setup(refname, logfile, err, flags & REF_FORCE_CREATE_REFLOG);
|
|
|
|
if (result)
|
|
return result;
|
|
|
|
logfd = open(logfile->buf, oflags);
|
|
if (logfd < 0)
|
|
return 0;
|
|
result = log_ref_write_fd(logfd, old_sha1, new_sha1,
|
|
git_committer_info(0), msg);
|
|
if (result) {
|
|
strbuf_addf(err, "unable to append to %s: %s", logfile->buf,
|
|
strerror(errno));
|
|
close(logfd);
|
|
return -1;
|
|
}
|
|
if (close(logfd)) {
|
|
strbuf_addf(err, "unable to append to %s: %s", logfile->buf,
|
|
strerror(errno));
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int log_ref_write(const char *refname, const unsigned char *old_sha1,
|
|
const unsigned char *new_sha1, const char *msg,
|
|
int flags, struct strbuf *err)
|
|
{
|
|
return files_log_ref_write(refname, old_sha1, new_sha1, msg, flags,
|
|
err);
|
|
}
|
|
|
|
int files_log_ref_write(const char *refname, const unsigned char *old_sha1,
|
|
const unsigned char *new_sha1, const char *msg,
|
|
int flags, struct strbuf *err)
|
|
{
|
|
struct strbuf sb = STRBUF_INIT;
|
|
int ret = log_ref_write_1(refname, old_sha1, new_sha1, msg, &sb, flags,
|
|
err);
|
|
strbuf_release(&sb);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Write sha1 into the open lockfile, then close the lockfile. On
|
|
* errors, rollback the lockfile, fill in *err and
|
|
* return -1.
|
|
*/
|
|
static int write_ref_to_lockfile(struct ref_lock *lock,
|
|
const unsigned char *sha1, struct strbuf *err)
|
|
{
|
|
static char term = '\n';
|
|
struct object *o;
|
|
int fd;
|
|
|
|
o = parse_object(sha1);
|
|
if (!o) {
|
|
strbuf_addf(err,
|
|
"Trying to write ref %s with nonexistent object %s",
|
|
lock->ref_name, sha1_to_hex(sha1));
|
|
unlock_ref(lock);
|
|
return -1;
|
|
}
|
|
if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) {
|
|
strbuf_addf(err,
|
|
"Trying to write non-commit object %s to branch %s",
|
|
sha1_to_hex(sha1), lock->ref_name);
|
|
unlock_ref(lock);
|
|
return -1;
|
|
}
|
|
fd = get_lock_file_fd(lock->lk);
|
|
if (write_in_full(fd, sha1_to_hex(sha1), 40) != 40 ||
|
|
write_in_full(fd, &term, 1) != 1 ||
|
|
close_ref(lock) < 0) {
|
|
strbuf_addf(err,
|
|
"Couldn't write %s", get_lock_file_path(lock->lk));
|
|
unlock_ref(lock);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Commit a change to a loose reference that has already been written
|
|
* to the loose reference lockfile. Also update the reflogs if
|
|
* necessary, using the specified lockmsg (which can be NULL).
|
|
*/
|
|
static int commit_ref_update(struct ref_lock *lock,
|
|
const unsigned char *sha1, const char *logmsg,
|
|
int flags, struct strbuf *err)
|
|
{
|
|
clear_loose_ref_cache(&ref_cache);
|
|
if (log_ref_write(lock->ref_name, lock->old_oid.hash, sha1, logmsg, flags, err) < 0 ||
|
|
(strcmp(lock->ref_name, lock->orig_ref_name) &&
|
|
log_ref_write(lock->orig_ref_name, lock->old_oid.hash, sha1, logmsg, flags, err) < 0)) {
|
|
char *old_msg = strbuf_detach(err, NULL);
|
|
strbuf_addf(err, "Cannot update the ref '%s': %s",
|
|
lock->ref_name, old_msg);
|
|
free(old_msg);
|
|
unlock_ref(lock);
|
|
return -1;
|
|
}
|
|
if (strcmp(lock->orig_ref_name, "HEAD") != 0) {
|
|
/*
|
|
* Special hack: If a branch is updated directly and HEAD
|
|
* points to it (may happen on the remote side of a push
|
|
* for example) then logically the HEAD reflog should be
|
|
* updated too.
|
|
* A generic solution implies reverse symref information,
|
|
* but finding all symrefs pointing to the given branch
|
|
* would be rather costly for this rare event (the direct
|
|
* update of a branch) to be worth it. So let's cheat and
|
|
* check with HEAD only which should cover 99% of all usage
|
|
* scenarios (even 100% of the default ones).
|
|
*/
|
|
unsigned char head_sha1[20];
|
|
int head_flag;
|
|
const char *head_ref;
|
|
head_ref = resolve_ref_unsafe("HEAD", RESOLVE_REF_READING,
|
|
head_sha1, &head_flag);
|
|
if (head_ref && (head_flag & REF_ISSYMREF) &&
|
|
!strcmp(head_ref, lock->ref_name)) {
|
|
struct strbuf log_err = STRBUF_INIT;
|
|
if (log_ref_write("HEAD", lock->old_oid.hash, sha1,
|
|
logmsg, 0, &log_err)) {
|
|
error("%s", log_err.buf);
|
|
strbuf_release(&log_err);
|
|
}
|
|
}
|
|
}
|
|
if (commit_ref(lock)) {
|
|
error("Couldn't set %s", lock->ref_name);
|
|
unlock_ref(lock);
|
|
return -1;
|
|
}
|
|
|
|
unlock_ref(lock);
|
|
return 0;
|
|
}
|
|
|
|
static int create_ref_symlink(struct ref_lock *lock, const char *target)
|
|
{
|
|
int ret = -1;
|
|
#ifndef NO_SYMLINK_HEAD
|
|
char *ref_path = get_locked_file_path(lock->lk);
|
|
unlink(ref_path);
|
|
ret = symlink(target, ref_path);
|
|
free(ref_path);
|
|
|
|
if (ret)
|
|
fprintf(stderr, "no symlink - falling back to symbolic ref\n");
|
|
#endif
|
|
return ret;
|
|
}
|
|
|
|
static void update_symref_reflog(struct ref_lock *lock, const char *refname,
|
|
const char *target, const char *logmsg)
|
|
{
|
|
struct strbuf err = STRBUF_INIT;
|
|
unsigned char new_sha1[20];
|
|
if (logmsg && !read_ref(target, new_sha1) &&
|
|
log_ref_write(refname, lock->old_oid.hash, new_sha1, logmsg, 0, &err)) {
|
|
error("%s", err.buf);
|
|
strbuf_release(&err);
|
|
}
|
|
}
|
|
|
|
static int create_symref_locked(struct ref_lock *lock, const char *refname,
|
|
const char *target, const char *logmsg)
|
|
{
|
|
if (prefer_symlink_refs && !create_ref_symlink(lock, target)) {
|
|
update_symref_reflog(lock, refname, target, logmsg);
|
|
return 0;
|
|
}
|
|
|
|
if (!fdopen_lock_file(lock->lk, "w"))
|
|
return error("unable to fdopen %s: %s",
|
|
lock->lk->tempfile.filename.buf, strerror(errno));
|
|
|
|
update_symref_reflog(lock, refname, target, logmsg);
|
|
|
|
/* no error check; commit_ref will check ferror */
|
|
fprintf(lock->lk->tempfile.fp, "ref: %s\n", target);
|
|
if (commit_ref(lock) < 0)
|
|
return error("unable to write symref for %s: %s", refname,
|
|
strerror(errno));
|
|
return 0;
|
|
}
|
|
|
|
int create_symref(const char *refname, const char *target, const char *logmsg)
|
|
{
|
|
struct strbuf err = STRBUF_INIT;
|
|
struct ref_lock *lock;
|
|
int ret;
|
|
|
|
lock = lock_ref_sha1_basic(refname, NULL, NULL, NULL, REF_NODEREF, NULL,
|
|
&err);
|
|
if (!lock) {
|
|
error("%s", err.buf);
|
|
strbuf_release(&err);
|
|
return -1;
|
|
}
|
|
|
|
ret = create_symref_locked(lock, refname, target, logmsg);
|
|
unlock_ref(lock);
|
|
return ret;
|
|
}
|
|
|
|
int reflog_exists(const char *refname)
|
|
{
|
|
struct stat st;
|
|
|
|
return !lstat(git_path("logs/%s", refname), &st) &&
|
|
S_ISREG(st.st_mode);
|
|
}
|
|
|
|
int delete_reflog(const char *refname)
|
|
{
|
|
return remove_path(git_path("logs/%s", refname));
|
|
}
|
|
|
|
static int show_one_reflog_ent(struct strbuf *sb, each_reflog_ent_fn fn, void *cb_data)
|
|
{
|
|
unsigned char osha1[20], nsha1[20];
|
|
char *email_end, *message;
|
|
unsigned long timestamp;
|
|
int tz;
|
|
|
|
/* old SP new SP name <email> SP time TAB msg LF */
|
|
if (sb->len < 83 || sb->buf[sb->len - 1] != '\n' ||
|
|
get_sha1_hex(sb->buf, osha1) || sb->buf[40] != ' ' ||
|
|
get_sha1_hex(sb->buf + 41, nsha1) || sb->buf[81] != ' ' ||
|
|
!(email_end = strchr(sb->buf + 82, '>')) ||
|
|
email_end[1] != ' ' ||
|
|
!(timestamp = strtoul(email_end + 2, &message, 10)) ||
|
|
!message || message[0] != ' ' ||
|
|
(message[1] != '+' && message[1] != '-') ||
|
|
!isdigit(message[2]) || !isdigit(message[3]) ||
|
|
!isdigit(message[4]) || !isdigit(message[5]))
|
|
return 0; /* corrupt? */
|
|
email_end[1] = '\0';
|
|
tz = strtol(message + 1, NULL, 10);
|
|
if (message[6] != '\t')
|
|
message += 6;
|
|
else
|
|
message += 7;
|
|
return fn(osha1, nsha1, sb->buf + 82, timestamp, tz, message, cb_data);
|
|
}
|
|
|
|
static char *find_beginning_of_line(char *bob, char *scan)
|
|
{
|
|
while (bob < scan && *(--scan) != '\n')
|
|
; /* keep scanning backwards */
|
|
/*
|
|
* Return either beginning of the buffer, or LF at the end of
|
|
* the previous line.
|
|
*/
|
|
return scan;
|
|
}
|
|
|
|
int for_each_reflog_ent_reverse(const char *refname, each_reflog_ent_fn fn, void *cb_data)
|
|
{
|
|
struct strbuf sb = STRBUF_INIT;
|
|
FILE *logfp;
|
|
long pos;
|
|
int ret = 0, at_tail = 1;
|
|
|
|
logfp = fopen(git_path("logs/%s", refname), "r");
|
|
if (!logfp)
|
|
return -1;
|
|
|
|
/* Jump to the end */
|
|
if (fseek(logfp, 0, SEEK_END) < 0)
|
|
return error("cannot seek back reflog for %s: %s",
|
|
refname, strerror(errno));
|
|
pos = ftell(logfp);
|
|
while (!ret && 0 < pos) {
|
|
int cnt;
|
|
size_t nread;
|
|
char buf[BUFSIZ];
|
|
char *endp, *scanp;
|
|
|
|
/* Fill next block from the end */
|
|
cnt = (sizeof(buf) < pos) ? sizeof(buf) : pos;
|
|
if (fseek(logfp, pos - cnt, SEEK_SET))
|
|
return error("cannot seek back reflog for %s: %s",
|
|
refname, strerror(errno));
|
|
nread = fread(buf, cnt, 1, logfp);
|
|
if (nread != 1)
|
|
return error("cannot read %d bytes from reflog for %s: %s",
|
|
cnt, refname, strerror(errno));
|
|
pos -= cnt;
|
|
|
|
scanp = endp = buf + cnt;
|
|
if (at_tail && scanp[-1] == '\n')
|
|
/* Looking at the final LF at the end of the file */
|
|
scanp--;
|
|
at_tail = 0;
|
|
|
|
while (buf < scanp) {
|
|
/*
|
|
* terminating LF of the previous line, or the beginning
|
|
* of the buffer.
|
|
*/
|
|
char *bp;
|
|
|
|
bp = find_beginning_of_line(buf, scanp);
|
|
|
|
if (*bp == '\n') {
|
|
/*
|
|
* The newline is the end of the previous line,
|
|
* so we know we have complete line starting
|
|
* at (bp + 1). Prefix it onto any prior data
|
|
* we collected for the line and process it.
|
|
*/
|
|
strbuf_splice(&sb, 0, 0, bp + 1, endp - (bp + 1));
|
|
scanp = bp;
|
|
endp = bp + 1;
|
|
ret = show_one_reflog_ent(&sb, fn, cb_data);
|
|
strbuf_reset(&sb);
|
|
if (ret)
|
|
break;
|
|
} else if (!pos) {
|
|
/*
|
|
* We are at the start of the buffer, and the
|
|
* start of the file; there is no previous
|
|
* line, and we have everything for this one.
|
|
* Process it, and we can end the loop.
|
|
*/
|
|
strbuf_splice(&sb, 0, 0, buf, endp - buf);
|
|
ret = show_one_reflog_ent(&sb, fn, cb_data);
|
|
strbuf_reset(&sb);
|
|
break;
|
|
}
|
|
|
|
if (bp == buf) {
|
|
/*
|
|
* We are at the start of the buffer, and there
|
|
* is more file to read backwards. Which means
|
|
* we are in the middle of a line. Note that we
|
|
* may get here even if *bp was a newline; that
|
|
* just means we are at the exact end of the
|
|
* previous line, rather than some spot in the
|
|
* middle.
|
|
*
|
|
* Save away what we have to be combined with
|
|
* the data from the next read.
|
|
*/
|
|
strbuf_splice(&sb, 0, 0, buf, endp - buf);
|
|
break;
|
|
}
|
|
}
|
|
|
|
}
|
|
if (!ret && sb.len)
|
|
die("BUG: reverse reflog parser had leftover data");
|
|
|
|
fclose(logfp);
|
|
strbuf_release(&sb);
|
|
return ret;
|
|
}
|
|
|
|
int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn, void *cb_data)
|
|
{
|
|
FILE *logfp;
|
|
struct strbuf sb = STRBUF_INIT;
|
|
int ret = 0;
|
|
|
|
logfp = fopen(git_path("logs/%s", refname), "r");
|
|
if (!logfp)
|
|
return -1;
|
|
|
|
while (!ret && !strbuf_getwholeline(&sb, logfp, '\n'))
|
|
ret = show_one_reflog_ent(&sb, fn, cb_data);
|
|
fclose(logfp);
|
|
strbuf_release(&sb);
|
|
return ret;
|
|
}
|
|
/*
|
|
* Call fn for each reflog in the namespace indicated by name. name
|
|
* must be empty or end with '/'. Name will be used as a scratch
|
|
* space, but its contents will be restored before return.
|
|
*/
|
|
static int do_for_each_reflog(struct strbuf *name, each_ref_fn fn, void *cb_data)
|
|
{
|
|
DIR *d = opendir(git_path("logs/%s", name->buf));
|
|
int retval = 0;
|
|
struct dirent *de;
|
|
int oldlen = name->len;
|
|
|
|
if (!d)
|
|
return name->len ? errno : 0;
|
|
|
|
while ((de = readdir(d)) != NULL) {
|
|
struct stat st;
|
|
|
|
if (de->d_name[0] == '.')
|
|
continue;
|
|
if (ends_with(de->d_name, ".lock"))
|
|
continue;
|
|
strbuf_addstr(name, de->d_name);
|
|
if (stat(git_path("logs/%s", name->buf), &st) < 0) {
|
|
; /* silently ignore */
|
|
} else {
|
|
if (S_ISDIR(st.st_mode)) {
|
|
strbuf_addch(name, '/');
|
|
retval = do_for_each_reflog(name, fn, cb_data);
|
|
} else {
|
|
struct object_id oid;
|
|
|
|
if (read_ref_full(name->buf, 0, oid.hash, NULL))
|
|
retval = error("bad ref for %s", name->buf);
|
|
else
|
|
retval = fn(name->buf, &oid, 0, cb_data);
|
|
}
|
|
if (retval)
|
|
break;
|
|
}
|
|
strbuf_setlen(name, oldlen);
|
|
}
|
|
closedir(d);
|
|
return retval;
|
|
}
|
|
|
|
int for_each_reflog(each_ref_fn fn, void *cb_data)
|
|
{
|
|
int retval;
|
|
struct strbuf name;
|
|
strbuf_init(&name, PATH_MAX);
|
|
retval = do_for_each_reflog(&name, fn, cb_data);
|
|
strbuf_release(&name);
|
|
return retval;
|
|
}
|
|
|
|
static int ref_update_reject_duplicates(struct string_list *refnames,
|
|
struct strbuf *err)
|
|
{
|
|
int i, n = refnames->nr;
|
|
|
|
assert(err);
|
|
|
|
for (i = 1; i < n; i++)
|
|
if (!strcmp(refnames->items[i - 1].string, refnames->items[i].string)) {
|
|
strbuf_addf(err,
|
|
"Multiple updates for ref '%s' not allowed.",
|
|
refnames->items[i].string);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int ref_transaction_commit(struct ref_transaction *transaction,
|
|
struct strbuf *err)
|
|
{
|
|
int ret = 0, i;
|
|
int n = transaction->nr;
|
|
struct ref_update **updates = transaction->updates;
|
|
struct string_list refs_to_delete = STRING_LIST_INIT_NODUP;
|
|
struct string_list_item *ref_to_delete;
|
|
struct string_list affected_refnames = STRING_LIST_INIT_NODUP;
|
|
|
|
assert(err);
|
|
|
|
if (transaction->state != REF_TRANSACTION_OPEN)
|
|
die("BUG: commit called for transaction that is not open");
|
|
|
|
if (!n) {
|
|
transaction->state = REF_TRANSACTION_CLOSED;
|
|
return 0;
|
|
}
|
|
|
|
/* Fail if a refname appears more than once in the transaction: */
|
|
for (i = 0; i < n; i++)
|
|
string_list_append(&affected_refnames, updates[i]->refname);
|
|
string_list_sort(&affected_refnames);
|
|
if (ref_update_reject_duplicates(&affected_refnames, err)) {
|
|
ret = TRANSACTION_GENERIC_ERROR;
|
|
goto cleanup;
|
|
}
|
|
|
|
/*
|
|
* Acquire all locks, verify old values if provided, check
|
|
* that new values are valid, and write new values to the
|
|
* lockfiles, ready to be activated. Only keep one lockfile
|
|
* open at a time to avoid running out of file descriptors.
|
|
*/
|
|
for (i = 0; i < n; i++) {
|
|
struct ref_update *update = updates[i];
|
|
|
|
if ((update->flags & REF_HAVE_NEW) &&
|
|
is_null_sha1(update->new_sha1))
|
|
update->flags |= REF_DELETING;
|
|
update->lock = lock_ref_sha1_basic(
|
|
update->refname,
|
|
((update->flags & REF_HAVE_OLD) ?
|
|
update->old_sha1 : NULL),
|
|
&affected_refnames, NULL,
|
|
update->flags,
|
|
&update->type,
|
|
err);
|
|
if (!update->lock) {
|
|
char *reason;
|
|
|
|
ret = (errno == ENOTDIR)
|
|
? TRANSACTION_NAME_CONFLICT
|
|
: TRANSACTION_GENERIC_ERROR;
|
|
reason = strbuf_detach(err, NULL);
|
|
strbuf_addf(err, "cannot lock ref '%s': %s",
|
|
update->refname, reason);
|
|
free(reason);
|
|
goto cleanup;
|
|
}
|
|
if ((update->flags & REF_HAVE_NEW) &&
|
|
!(update->flags & REF_DELETING)) {
|
|
int overwriting_symref = ((update->type & REF_ISSYMREF) &&
|
|
(update->flags & REF_NODEREF));
|
|
|
|
if (!overwriting_symref &&
|
|
!hashcmp(update->lock->old_oid.hash, update->new_sha1)) {
|
|
/*
|
|
* The reference already has the desired
|
|
* value, so we don't need to write it.
|
|
*/
|
|
} else if (write_ref_to_lockfile(update->lock,
|
|
update->new_sha1,
|
|
err)) {
|
|
char *write_err = strbuf_detach(err, NULL);
|
|
|
|
/*
|
|
* The lock was freed upon failure of
|
|
* write_ref_to_lockfile():
|
|
*/
|
|
update->lock = NULL;
|
|
strbuf_addf(err,
|
|
"cannot update the ref '%s': %s",
|
|
update->refname, write_err);
|
|
free(write_err);
|
|
ret = TRANSACTION_GENERIC_ERROR;
|
|
goto cleanup;
|
|
} else {
|
|
update->flags |= REF_NEEDS_COMMIT;
|
|
}
|
|
}
|
|
if (!(update->flags & REF_NEEDS_COMMIT)) {
|
|
/*
|
|
* We didn't have to write anything to the lockfile.
|
|
* Close it to free up the file descriptor:
|
|
*/
|
|
if (close_ref(update->lock)) {
|
|
strbuf_addf(err, "Couldn't close %s.lock",
|
|
update->refname);
|
|
goto cleanup;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Perform updates first so live commits remain referenced */
|
|
for (i = 0; i < n; i++) {
|
|
struct ref_update *update = updates[i];
|
|
|
|
if (update->flags & REF_NEEDS_COMMIT) {
|
|
if (commit_ref_update(update->lock,
|
|
update->new_sha1, update->msg,
|
|
update->flags, err)) {
|
|
/* freed by commit_ref_update(): */
|
|
update->lock = NULL;
|
|
ret = TRANSACTION_GENERIC_ERROR;
|
|
goto cleanup;
|
|
} else {
|
|
/* freed by commit_ref_update(): */
|
|
update->lock = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Perform deletes now that updates are safely completed */
|
|
for (i = 0; i < n; i++) {
|
|
struct ref_update *update = updates[i];
|
|
|
|
if (update->flags & REF_DELETING) {
|
|
if (delete_ref_loose(update->lock, update->type, err)) {
|
|
ret = TRANSACTION_GENERIC_ERROR;
|
|
goto cleanup;
|
|
}
|
|
|
|
if (!(update->flags & REF_ISPRUNING))
|
|
string_list_append(&refs_to_delete,
|
|
update->lock->ref_name);
|
|
}
|
|
}
|
|
|
|
if (repack_without_refs(&refs_to_delete, err)) {
|
|
ret = TRANSACTION_GENERIC_ERROR;
|
|
goto cleanup;
|
|
}
|
|
for_each_string_list_item(ref_to_delete, &refs_to_delete)
|
|
unlink_or_warn(git_path("logs/%s", ref_to_delete->string));
|
|
clear_loose_ref_cache(&ref_cache);
|
|
|
|
cleanup:
|
|
transaction->state = REF_TRANSACTION_CLOSED;
|
|
|
|
for (i = 0; i < n; i++)
|
|
if (updates[i]->lock)
|
|
unlock_ref(updates[i]->lock);
|
|
string_list_clear(&refs_to_delete, 0);
|
|
string_list_clear(&affected_refnames, 0);
|
|
return ret;
|
|
}
|
|
|
|
static int ref_present(const char *refname,
|
|
const struct object_id *oid, int flags, void *cb_data)
|
|
{
|
|
struct string_list *affected_refnames = cb_data;
|
|
|
|
return string_list_has_string(affected_refnames, refname);
|
|
}
|
|
|
|
int initial_ref_transaction_commit(struct ref_transaction *transaction,
|
|
struct strbuf *err)
|
|
{
|
|
int ret = 0, i;
|
|
int n = transaction->nr;
|
|
struct ref_update **updates = transaction->updates;
|
|
struct string_list affected_refnames = STRING_LIST_INIT_NODUP;
|
|
|
|
assert(err);
|
|
|
|
if (transaction->state != REF_TRANSACTION_OPEN)
|
|
die("BUG: commit called for transaction that is not open");
|
|
|
|
/* Fail if a refname appears more than once in the transaction: */
|
|
for (i = 0; i < n; i++)
|
|
string_list_append(&affected_refnames, updates[i]->refname);
|
|
string_list_sort(&affected_refnames);
|
|
if (ref_update_reject_duplicates(&affected_refnames, err)) {
|
|
ret = TRANSACTION_GENERIC_ERROR;
|
|
goto cleanup;
|
|
}
|
|
|
|
/*
|
|
* It's really undefined to call this function in an active
|
|
* repository or when there are existing references: we are
|
|
* only locking and changing packed-refs, so (1) any
|
|
* simultaneous processes might try to change a reference at
|
|
* the same time we do, and (2) any existing loose versions of
|
|
* the references that we are setting would have precedence
|
|
* over our values. But some remote helpers create the remote
|
|
* "HEAD" and "master" branches before calling this function,
|
|
* so here we really only check that none of the references
|
|
* that we are creating already exists.
|
|
*/
|
|
if (for_each_rawref(ref_present, &affected_refnames))
|
|
die("BUG: initial ref transaction called with existing refs");
|
|
|
|
for (i = 0; i < n; i++) {
|
|
struct ref_update *update = updates[i];
|
|
|
|
if ((update->flags & REF_HAVE_OLD) &&
|
|
!is_null_sha1(update->old_sha1))
|
|
die("BUG: initial ref transaction with old_sha1 set");
|
|
if (verify_refname_available(update->refname,
|
|
&affected_refnames, NULL,
|
|
err)) {
|
|
ret = TRANSACTION_NAME_CONFLICT;
|
|
goto cleanup;
|
|
}
|
|
}
|
|
|
|
if (lock_packed_refs(0)) {
|
|
strbuf_addf(err, "unable to lock packed-refs file: %s",
|
|
strerror(errno));
|
|
ret = TRANSACTION_GENERIC_ERROR;
|
|
goto cleanup;
|
|
}
|
|
|
|
for (i = 0; i < n; i++) {
|
|
struct ref_update *update = updates[i];
|
|
|
|
if ((update->flags & REF_HAVE_NEW) &&
|
|
!is_null_sha1(update->new_sha1))
|
|
add_packed_ref(update->refname, update->new_sha1);
|
|
}
|
|
|
|
if (commit_packed_refs()) {
|
|
strbuf_addf(err, "unable to commit packed-refs file: %s",
|
|
strerror(errno));
|
|
ret = TRANSACTION_GENERIC_ERROR;
|
|
goto cleanup;
|
|
}
|
|
|
|
cleanup:
|
|
transaction->state = REF_TRANSACTION_CLOSED;
|
|
string_list_clear(&affected_refnames, 0);
|
|
return ret;
|
|
}
|
|
|
|
struct expire_reflog_cb {
|
|
unsigned int flags;
|
|
reflog_expiry_should_prune_fn *should_prune_fn;
|
|
void *policy_cb;
|
|
FILE *newlog;
|
|
unsigned char last_kept_sha1[20];
|
|
};
|
|
|
|
static int expire_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
|
|
const char *email, unsigned long timestamp, int tz,
|
|
const char *message, void *cb_data)
|
|
{
|
|
struct expire_reflog_cb *cb = cb_data;
|
|
struct expire_reflog_policy_cb *policy_cb = cb->policy_cb;
|
|
|
|
if (cb->flags & EXPIRE_REFLOGS_REWRITE)
|
|
osha1 = cb->last_kept_sha1;
|
|
|
|
if ((*cb->should_prune_fn)(osha1, nsha1, email, timestamp, tz,
|
|
message, policy_cb)) {
|
|
if (!cb->newlog)
|
|
printf("would prune %s", message);
|
|
else if (cb->flags & EXPIRE_REFLOGS_VERBOSE)
|
|
printf("prune %s", message);
|
|
} else {
|
|
if (cb->newlog) {
|
|
fprintf(cb->newlog, "%s %s %s %lu %+05d\t%s",
|
|
sha1_to_hex(osha1), sha1_to_hex(nsha1),
|
|
email, timestamp, tz, message);
|
|
hashcpy(cb->last_kept_sha1, nsha1);
|
|
}
|
|
if (cb->flags & EXPIRE_REFLOGS_VERBOSE)
|
|
printf("keep %s", message);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int reflog_expire(const char *refname, const unsigned char *sha1,
|
|
unsigned int flags,
|
|
reflog_expiry_prepare_fn prepare_fn,
|
|
reflog_expiry_should_prune_fn should_prune_fn,
|
|
reflog_expiry_cleanup_fn cleanup_fn,
|
|
void *policy_cb_data)
|
|
{
|
|
static struct lock_file reflog_lock;
|
|
struct expire_reflog_cb cb;
|
|
struct ref_lock *lock;
|
|
char *log_file;
|
|
int status = 0;
|
|
int type;
|
|
struct strbuf err = STRBUF_INIT;
|
|
|
|
memset(&cb, 0, sizeof(cb));
|
|
cb.flags = flags;
|
|
cb.policy_cb = policy_cb_data;
|
|
cb.should_prune_fn = should_prune_fn;
|
|
|
|
/*
|
|
* The reflog file is locked by holding the lock on the
|
|
* reference itself, plus we might need to update the
|
|
* reference if --updateref was specified:
|
|
*/
|
|
lock = lock_ref_sha1_basic(refname, sha1, NULL, NULL, 0, &type, &err);
|
|
if (!lock) {
|
|
error("cannot lock ref '%s': %s", refname, err.buf);
|
|
strbuf_release(&err);
|
|
return -1;
|
|
}
|
|
if (!reflog_exists(refname)) {
|
|
unlock_ref(lock);
|
|
return 0;
|
|
}
|
|
|
|
log_file = git_pathdup("logs/%s", refname);
|
|
if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) {
|
|
/*
|
|
* Even though holding $GIT_DIR/logs/$reflog.lock has
|
|
* no locking implications, we use the lock_file
|
|
* machinery here anyway because it does a lot of the
|
|
* work we need, including cleaning up if the program
|
|
* exits unexpectedly.
|
|
*/
|
|
if (hold_lock_file_for_update(&reflog_lock, log_file, 0) < 0) {
|
|
struct strbuf err = STRBUF_INIT;
|
|
unable_to_lock_message(log_file, errno, &err);
|
|
error("%s", err.buf);
|
|
strbuf_release(&err);
|
|
goto failure;
|
|
}
|
|
cb.newlog = fdopen_lock_file(&reflog_lock, "w");
|
|
if (!cb.newlog) {
|
|
error("cannot fdopen %s (%s)",
|
|
get_lock_file_path(&reflog_lock), strerror(errno));
|
|
goto failure;
|
|
}
|
|
}
|
|
|
|
(*prepare_fn)(refname, sha1, cb.policy_cb);
|
|
for_each_reflog_ent(refname, expire_reflog_ent, &cb);
|
|
(*cleanup_fn)(cb.policy_cb);
|
|
|
|
if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) {
|
|
/*
|
|
* It doesn't make sense to adjust a reference pointed
|
|
* to by a symbolic ref based on expiring entries in
|
|
* the symbolic reference's reflog. Nor can we update
|
|
* a reference if there are no remaining reflog
|
|
* entries.
|
|
*/
|
|
int update = (flags & EXPIRE_REFLOGS_UPDATE_REF) &&
|
|
!(type & REF_ISSYMREF) &&
|
|
!is_null_sha1(cb.last_kept_sha1);
|
|
|
|
if (close_lock_file(&reflog_lock)) {
|
|
status |= error("couldn't write %s: %s", log_file,
|
|
strerror(errno));
|
|
} else if (update &&
|
|
(write_in_full(get_lock_file_fd(lock->lk),
|
|
sha1_to_hex(cb.last_kept_sha1), 40) != 40 ||
|
|
write_str_in_full(get_lock_file_fd(lock->lk), "\n") != 1 ||
|
|
close_ref(lock) < 0)) {
|
|
status |= error("couldn't write %s",
|
|
get_lock_file_path(lock->lk));
|
|
rollback_lock_file(&reflog_lock);
|
|
} else if (commit_lock_file(&reflog_lock)) {
|
|
status |= error("unable to write reflog '%s' (%s)",
|
|
log_file, strerror(errno));
|
|
} else if (update && commit_ref(lock)) {
|
|
status |= error("couldn't set %s", lock->ref_name);
|
|
}
|
|
}
|
|
free(log_file);
|
|
unlock_ref(lock);
|
|
return status;
|
|
|
|
failure:
|
|
rollback_lock_file(&reflog_lock);
|
|
free(log_file);
|
|
unlock_ref(lock);
|
|
return -1;
|
|
}
|