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git/read-cache-ll.h

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#ifndef READ_CACHE_LL_H
#define READ_CACHE_LL_H
#include "hash-ll.h"
#include "hashmap.h"
#include "statinfo.h"
/*
* Basic data structures for the directory cache
*/
#define CACHE_SIGNATURE 0x44495243 /* "DIRC" */
struct cache_header {
uint32_t hdr_signature;
uint32_t hdr_version;
uint32_t hdr_entries;
};
#define INDEX_FORMAT_LB 2
#define INDEX_FORMAT_UB 4
struct cache_entry {
struct hashmap_entry ent;
struct stat_data ce_stat_data;
unsigned int ce_mode;
unsigned int ce_flags;
unsigned int mem_pool_allocated;
unsigned int ce_namelen;
unsigned int index; /* for link extension */
struct object_id oid;
char name[FLEX_ARRAY]; /* more */
};
#define CE_STAGEMASK (0x3000)
#define CE_EXTENDED (0x4000)
#define CE_VALID (0x8000)
#define CE_STAGESHIFT 12
/*
* Range 0xFFFF0FFF in ce_flags is divided into
* two parts: in-memory flags and on-disk ones.
* Flags in CE_EXTENDED_FLAGS will get saved on-disk
* if you want to save a new flag, add it in
* CE_EXTENDED_FLAGS
*
* In-memory only flags
*/
#define CE_UPDATE (1 << 16)
#define CE_REMOVE (1 << 17)
#define CE_UPTODATE (1 << 18)
#define CE_ADDED (1 << 19)
#define CE_HASHED (1 << 20)
#define CE_FSMONITOR_VALID (1 << 21)
#define CE_WT_REMOVE (1 << 22) /* remove in work directory */
#define CE_CONFLICTED (1 << 23)
#define CE_UNPACKED (1 << 24)
#define CE_NEW_SKIP_WORKTREE (1 << 25)
/* used to temporarily mark paths matched by pathspecs */
#define CE_MATCHED (1 << 26)
#define CE_UPDATE_IN_BASE (1 << 27)
#define CE_STRIP_NAME (1 << 28)
/*
* Extended on-disk flags
*/
#define CE_INTENT_TO_ADD (1 << 29)
#define CE_SKIP_WORKTREE (1 << 30)
/* CE_EXTENDED2 is for future extension */
#define CE_EXTENDED2 (1U << 31)
#define CE_EXTENDED_FLAGS (CE_INTENT_TO_ADD | CE_SKIP_WORKTREE)
/*
* Safeguard to avoid saving wrong flags:
* - CE_EXTENDED2 won't get saved until its semantic is known
* - Bits in 0x0000FFFF have been saved in ce_flags already
* - Bits in 0x003F0000 are currently in-memory flags
*/
#if CE_EXTENDED_FLAGS & 0x803FFFFF
#error "CE_EXTENDED_FLAGS out of range"
#endif
/* Forward structure decls */
struct pathspec;
struct tree;
/*
* Copy the sha1 and stat state of a cache entry from one to
* another. But we never change the name, or the hash state!
*/
static inline void copy_cache_entry(struct cache_entry *dst,
const struct cache_entry *src)
{
unsigned int state = dst->ce_flags & CE_HASHED;
int mem_pool_allocated = dst->mem_pool_allocated;
/* Don't copy hash chain and name */
memcpy(&dst->ce_stat_data, &src->ce_stat_data,
offsetof(struct cache_entry, name) -
offsetof(struct cache_entry, ce_stat_data));
/* Restore the hash state */
dst->ce_flags = (dst->ce_flags & ~CE_HASHED) | state;
/* Restore the mem_pool_allocated flag */
dst->mem_pool_allocated = mem_pool_allocated;
}
static inline unsigned create_ce_flags(unsigned stage)
{
return (stage << CE_STAGESHIFT);
}
#define ce_namelen(ce) ((ce)->ce_namelen)
#define ce_size(ce) cache_entry_size(ce_namelen(ce))
#define ce_stage(ce) ((CE_STAGEMASK & (ce)->ce_flags) >> CE_STAGESHIFT)
#define ce_uptodate(ce) ((ce)->ce_flags & CE_UPTODATE)
#define ce_skip_worktree(ce) ((ce)->ce_flags & CE_SKIP_WORKTREE)
#define ce_mark_uptodate(ce) ((ce)->ce_flags |= CE_UPTODATE)
#define ce_intent_to_add(ce) ((ce)->ce_flags & CE_INTENT_TO_ADD)
#define cache_entry_size(len) (offsetof(struct cache_entry,name) + (len) + 1)
#define SOMETHING_CHANGED (1 << 0) /* unclassified changes go here */
#define CE_ENTRY_CHANGED (1 << 1)
#define CE_ENTRY_REMOVED (1 << 2)
#define CE_ENTRY_ADDED (1 << 3)
#define RESOLVE_UNDO_CHANGED (1 << 4)
#define CACHE_TREE_CHANGED (1 << 5)
#define SPLIT_INDEX_ORDERED (1 << 6)
#define UNTRACKED_CHANGED (1 << 7)
#define FSMONITOR_CHANGED (1 << 8)
struct split_index;
struct untracked_cache;
struct progress;
struct pattern_list;
enum sparse_index_mode {
/*
* There are no sparse directories in the index at all.
*
* Repositories that don't use cone-mode sparse-checkout will
* always have their indexes in this mode.
*/
INDEX_EXPANDED = 0,
/*
* The index has already been collapsed to sparse directories
* whereever possible.
*/
INDEX_COLLAPSED,
/*
* The sparse directories that exist are outside the
* sparse-checkout boundary, but it is possible that some file
* entries could collapse to sparse directory entries.
*/
INDEX_PARTIALLY_SPARSE,
};
struct index_state {
struct cache_entry **cache;
unsigned int version;
unsigned int cache_nr, cache_alloc, cache_changed;
struct string_list *resolve_undo;
struct cache_tree *cache_tree;
struct split_index *split_index;
struct cache_time timestamp;
unsigned name_hash_initialized : 1,
initialized : 1,
drop_cache_tree : 1,
updated_workdir : 1,
updated_skipworktree : 1,
fsmonitor_has_run_once : 1;
enum sparse_index_mode sparse_index;
struct hashmap name_hash;
struct hashmap dir_hash;
struct object_id oid;
struct untracked_cache *untracked;
char *fsmonitor_last_update;
struct ewah_bitmap *fsmonitor_dirty;
struct mem_pool *ce_mem_pool;
struct progress *progress;
struct repository *repo;
struct pattern_list *sparse_checkout_patterns;
};
/**
* A "struct index_state istate" must be initialized with
* INDEX_STATE_INIT or the corresponding index_state_init().
*
* If the variable won't be used again, use release_index() to free()
* its resources. If it needs to be used again use discard_index(),
* which does the same thing, but will use use index_state_init() at
* the end. The discard_index() will use its own "istate->repo" as the
* "r" argument to index_state_init() in that case.
*/
#define INDEX_STATE_INIT(r) { \
.repo = (r), \
}
void index_state_init(struct index_state *istate, struct repository *r);
void release_index(struct index_state *istate);
/* Cache entry creation and cleanup */
/*
* Create cache_entry intended for use in the specified index. Caller
* is responsible for discarding the cache_entry with
* `discard_cache_entry`.
*/
struct cache_entry *make_cache_entry(struct index_state *istate,
unsigned int mode,
const struct object_id *oid,
const char *path,
int stage,
unsigned int refresh_options);
struct cache_entry *make_empty_cache_entry(struct index_state *istate,
size_t name_len);
/*
* Create a cache_entry that is not intended to be added to an index. If
* `ce_mem_pool` is not NULL, the entry is allocated within the given memory
* pool. Caller is responsible for discarding "loose" entries with
* `discard_cache_entry()` and the memory pool with
* `mem_pool_discard(ce_mem_pool, should_validate_cache_entries())`.
*/
struct cache_entry *make_transient_cache_entry(unsigned int mode,
const struct object_id *oid,
const char *path,
int stage,
struct mem_pool *ce_mem_pool);
struct cache_entry *make_empty_transient_cache_entry(size_t len,
struct mem_pool *ce_mem_pool);
/*
* Discard cache entry.
*/
void discard_cache_entry(struct cache_entry *ce);
/*
* Check configuration if we should perform extra validation on cache
* entries.
*/
int should_validate_cache_entries(void);
/*
* Duplicate a cache_entry. Allocate memory for the new entry from a
* memory_pool. Takes into account cache_entry fields that are meant
* for managing the underlying memory allocation of the cache_entry.
*/
struct cache_entry *dup_cache_entry(const struct cache_entry *ce, struct index_state *istate);
/*
* Validate the cache entries in the index. This is an internal
* consistency check that the cache_entry structs are allocated from
* the expected memory pool.
*/
void validate_cache_entries(const struct index_state *istate);
/*
* Bulk prefetch all missing cache entries that are not GITLINKs and that match
* the given predicate. This function should only be called if
* repo_has_promisor_remote() returns true.
*/
typedef int (*must_prefetch_predicate)(const struct cache_entry *);
void prefetch_cache_entries(const struct index_state *istate,
must_prefetch_predicate must_prefetch);
/* Initialize and use the cache information */
struct lock_file;
int do_read_index(struct index_state *istate, const char *path,
int must_exist); /* for testting only! */
int read_index_from(struct index_state *, const char *path,
const char *gitdir);
int is_index_unborn(struct index_state *);
/* For use with `write_locked_index()`. */
#define COMMIT_LOCK (1 << 0)
#define SKIP_IF_UNCHANGED (1 << 1)
/*
* Write the index while holding an already-taken lock. Close the lock,
* and if `COMMIT_LOCK` is given, commit it.
*
* Unless a split index is in use, write the index into the lockfile.
*
* With a split index, write the shared index to a temporary file,
* adjust its permissions and rename it into place, then write the
* split index to the lockfile. If the temporary file for the shared
* index cannot be created, fall back to the behavior described in
* the previous paragraph.
*
* With `COMMIT_LOCK`, the lock is always committed or rolled back.
* Without it, the lock is closed, but neither committed nor rolled
* back.
*
* If `SKIP_IF_UNCHANGED` is given and the index is unchanged, nothing
* is written (and the lock is rolled back if `COMMIT_LOCK` is given).
*/
int write_locked_index(struct index_state *, struct lock_file *lock, unsigned flags);
void discard_index(struct index_state *);
void move_index_extensions(struct index_state *dst, struct index_state *src);
int unmerged_index(const struct index_state *);
/**
* Returns 1 if istate differs from tree, 0 otherwise. If tree is NULL,
* compares istate to HEAD. If tree is NULL and on an unborn branch,
* returns 1 if there are entries in istate, 0 otherwise. If an strbuf is
* provided, the space-separated list of files that differ will be appended
* to it.
*/
int repo_index_has_changes(struct repository *repo,
struct tree *tree,
struct strbuf *sb);
int verify_path(const char *path, unsigned mode);
int strcmp_offset(const char *s1, const char *s2, size_t *first_change);
/*
* Searches for an entry defined by name and namelen in the given index.
* If the return value is positive (including 0) it is the position of an
* exact match. If the return value is negative, the negated value minus 1
* is the position where the entry would be inserted.
* Example: The current index consists of these files and its stages:
*
* b#0, d#0, f#1, f#3
*
* index_name_pos(&index, "a", 1) -> -1
* index_name_pos(&index, "b", 1) -> 0
* index_name_pos(&index, "c", 1) -> -2
* index_name_pos(&index, "d", 1) -> 1
* index_name_pos(&index, "e", 1) -> -3
* index_name_pos(&index, "f", 1) -> -3
* index_name_pos(&index, "g", 1) -> -5
*/
int index_name_pos(struct index_state *, const char *name, int namelen);
/*
* Like index_name_pos, returns the position of an entry of the given name in
* the index if one exists, otherwise returns a negative value where the negated
* value minus 1 is the position where the index entry would be inserted. Unlike
* index_name_pos, however, a sparse index is not expanded to find an entry
* inside a sparse directory.
*/
int index_name_pos_sparse(struct index_state *, const char *name, int namelen);
/*
* Determines whether an entry with the given name exists within the
* given index. The return value is 1 if an exact match is found, otherwise
* it is 0. Note that, unlike index_name_pos, this function does not expand
* the index if it is sparse. If an item exists within the full index but it
* is contained within a sparse directory (and not in the sparse index), 0 is
* returned.
*/
int index_entry_exists(struct index_state *, const char *name, int namelen);
/*
* Some functions return the negative complement of an insert position when a
* precise match was not found but a position was found where the entry would
* need to be inserted. This helper protects that logic from any integer
* underflow.
*/
static inline int index_pos_to_insert_pos(uintmax_t pos)
{
if (pos > INT_MAX)
die("overflow: -1 - %"PRIuMAX, pos);
return -1 - (int)pos;
}
#define ADD_CACHE_OK_TO_ADD 1 /* Ok to add */
#define ADD_CACHE_OK_TO_REPLACE 2 /* Ok to replace file/directory */
#define ADD_CACHE_SKIP_DFCHECK 4 /* Ok to skip DF conflict checks */
#define ADD_CACHE_JUST_APPEND 8 /* Append only */
#define ADD_CACHE_NEW_ONLY 16 /* Do not replace existing ones */
#define ADD_CACHE_KEEP_CACHE_TREE 32 /* Do not invalidate cache-tree */
#define ADD_CACHE_RENORMALIZE 64 /* Pass along HASH_RENORMALIZE */
int add_index_entry(struct index_state *, struct cache_entry *ce, int option);
void rename_index_entry_at(struct index_state *, int pos, const char *new_name);
/* Remove entry, return true if there are more entries to go. */
int remove_index_entry_at(struct index_state *, int pos);
void remove_marked_cache_entries(struct index_state *istate, int invalidate);
int remove_file_from_index(struct index_state *, const char *path);
#define ADD_CACHE_VERBOSE 1
#define ADD_CACHE_PRETEND 2
#define ADD_CACHE_IGNORE_ERRORS 4
#define ADD_CACHE_IGNORE_REMOVAL 8
#define ADD_CACHE_INTENT 16
/*
* These two are used to add the contents of the file at path
* to the index, marking the working tree up-to-date by storing
* the cached stat info in the resulting cache entry. A caller
* that has already run lstat(2) on the path can call
* add_to_index(), and all others can call add_file_to_index();
* the latter will do necessary lstat(2) internally before
* calling the former.
*/
int add_to_index(struct index_state *, const char *path, struct stat *, int flags);
int add_file_to_index(struct index_state *, const char *path, int flags);
int chmod_index_entry(struct index_state *, struct cache_entry *ce, char flip);
int ce_same_name(const struct cache_entry *a, const struct cache_entry *b);
void set_object_name_for_intent_to_add_entry(struct cache_entry *ce);
int index_name_is_other(struct index_state *, const char *, int);
void *read_blob_data_from_index(struct index_state *, const char *, unsigned long *);
/* do stat comparison even if CE_VALID is true */
#define CE_MATCH_IGNORE_VALID 01
/* do not check the contents but report dirty on racily-clean entries */
#define CE_MATCH_RACY_IS_DIRTY 02
/* do stat comparison even if CE_SKIP_WORKTREE is true */
#define CE_MATCH_IGNORE_SKIP_WORKTREE 04
/* ignore non-existent files during stat update */
#define CE_MATCH_IGNORE_MISSING 0x08
/* enable stat refresh */
#define CE_MATCH_REFRESH 0x10
/* don't refresh_fsmonitor state or do stat comparison even if CE_FSMONITOR_VALID is true */
#define CE_MATCH_IGNORE_FSMONITOR 0X20
int is_racy_timestamp(const struct index_state *istate,
const struct cache_entry *ce);
int has_racy_timestamp(struct index_state *istate);
int ie_match_stat(struct index_state *, const struct cache_entry *, struct stat *, unsigned int);
int ie_modified(struct index_state *, const struct cache_entry *, struct stat *, unsigned int);
int match_stat_data_racy(const struct index_state *istate,
const struct stat_data *sd, struct stat *st);
void fill_stat_cache_info(struct index_state *istate, struct cache_entry *ce, struct stat *st);
#define REFRESH_REALLY (1 << 0) /* ignore_valid */
#define REFRESH_UNMERGED (1 << 1) /* allow unmerged */
#define REFRESH_QUIET (1 << 2) /* be quiet about it */
#define REFRESH_IGNORE_MISSING (1 << 3) /* ignore non-existent */
#define REFRESH_IGNORE_SUBMODULES (1 << 4) /* ignore submodules */
#define REFRESH_IN_PORCELAIN (1 << 5) /* user friendly output, not "needs update" */
#define REFRESH_PROGRESS (1 << 6) /* show progress bar if stderr is tty */
#define REFRESH_IGNORE_SKIP_WORKTREE (1 << 7) /* ignore skip_worktree entries */
int refresh_index(struct index_state *, unsigned int flags, const struct pathspec *pathspec, char *seen, const char *header_msg);
/*
* Refresh the index and write it to disk.
*
* 'refresh_flags' is passed directly to 'refresh_index()', while
* 'COMMIT_LOCK | write_flags' is passed to 'write_locked_index()', so
* the lockfile is always either committed or rolled back.
*
* If 'gentle' is passed, errors locking the index are ignored.
*
* Return 1 if refreshing the index returns an error, -1 if writing
* the index to disk fails, 0 on success.
*
* Note that if refreshing the index returns an error, we still write
* out the index (unless locking fails).
*/
int repo_refresh_and_write_index(struct repository*, unsigned int refresh_flags, unsigned int write_flags, int gentle, const struct pathspec *, char *seen, const char *header_msg);
struct cache_entry *refresh_cache_entry(struct index_state *, struct cache_entry *, unsigned int);
void set_alternate_index_output(const char *);
extern int verify_index_checksum;
extern int verify_ce_order;
int cmp_cache_name_compare(const void *a_, const void *b_);
int add_files_to_cache(struct repository *repo, const char *prefix,
const struct pathspec *pathspec, int include_sparse,
int flags);
void overlay_tree_on_index(struct index_state *istate,
const char *tree_name, const char *prefix);
#endif /* READ_CACHE_LL_H */
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