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git/fsck.c

385 lines
10 KiB
C
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#include "cache.h"
#include "object.h"
#include "blob.h"
#include "tree.h"
#include "tree-walk.h"
#include "commit.h"
#include "tag.h"
#include "fsck.h"
static int fsck_walk_tree(struct tree *tree, fsck_walk_func walk, void *data)
{
struct tree_desc desc;
struct name_entry entry;
int res = 0;
if (parse_tree(tree))
return -1;
init_tree_desc(&desc, tree->buffer, tree->size);
while (tree_entry(&desc, &entry)) {
int result;
if (S_ISGITLINK(entry.mode))
continue;
if (S_ISDIR(entry.mode))
result = walk(&lookup_tree(entry.sha1)->object, OBJ_TREE, data);
else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode))
result = walk(&lookup_blob(entry.sha1)->object, OBJ_BLOB, data);
else {
result = error("in tree %s: entry %s has bad mode %.6o",
sha1_to_hex(tree->object.sha1), entry.path, entry.mode);
}
if (result < 0)
return result;
if (!res)
res = result;
}
return res;
}
static int fsck_walk_commit(struct commit *commit, fsck_walk_func walk, void *data)
{
struct commit_list *parents;
int res;
int result;
if (parse_commit(commit))
return -1;
result = walk((struct object *)commit->tree, OBJ_TREE, data);
if (result < 0)
return result;
res = result;
parents = commit->parents;
while (parents) {
result = walk((struct object *)parents->item, OBJ_COMMIT, data);
if (result < 0)
return result;
if (!res)
res = result;
parents = parents->next;
}
return res;
}
static int fsck_walk_tag(struct tag *tag, fsck_walk_func walk, void *data)
{
if (parse_tag(tag))
return -1;
return walk(tag->tagged, OBJ_ANY, data);
}
int fsck_walk(struct object *obj, fsck_walk_func walk, void *data)
{
if (!obj)
return -1;
switch (obj->type) {
case OBJ_BLOB:
return 0;
case OBJ_TREE:
return fsck_walk_tree((struct tree *)obj, walk, data);
case OBJ_COMMIT:
return fsck_walk_commit((struct commit *)obj, walk, data);
case OBJ_TAG:
return fsck_walk_tag((struct tag *)obj, walk, data);
default:
error("Unknown object type for %s", sha1_to_hex(obj->sha1));
return -1;
}
}
/*
* The entries in a tree are ordered in the _path_ order,
* which means that a directory entry is ordered by adding
* a slash to the end of it.
*
* So a directory called "a" is ordered _after_ a file
* called "a.c", because "a/" sorts after "a.c".
*/
#define TREE_UNORDERED (-1)
#define TREE_HAS_DUPS (-2)
static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, const char *name2)
{
int len1 = strlen(name1);
int len2 = strlen(name2);
int len = len1 < len2 ? len1 : len2;
unsigned char c1, c2;
int cmp;
cmp = memcmp(name1, name2, len);
if (cmp < 0)
return 0;
if (cmp > 0)
return TREE_UNORDERED;
/*
* Ok, the first <len> characters are the same.
* Now we need to order the next one, but turn
* a '\0' into a '/' for a directory entry.
*/
c1 = name1[len];
c2 = name2[len];
if (!c1 && !c2)
/*
* git-write-tree used to write out a nonsense tree that has
* entries with the same name, one blob and one tree. Make
* sure we do not have duplicate entries.
*/
return TREE_HAS_DUPS;
if (!c1 && S_ISDIR(mode1))
c1 = '/';
if (!c2 && S_ISDIR(mode2))
c2 = '/';
return c1 < c2 ? 0 : TREE_UNORDERED;
}
static int fsck_tree(struct tree *item, int strict, fsck_error error_func)
{
int retval;
int has_null_sha1 = 0;
int has_full_path = 0;
int has_empty_name = 0;
int has_dot = 0;
int has_dotdot = 0;
int has_dotgit = 0;
int has_zero_pad = 0;
int has_bad_modes = 0;
int has_dup_entries = 0;
int not_properly_sorted = 0;
struct tree_desc desc;
unsigned o_mode;
const char *o_name;
init_tree_desc(&desc, item->buffer, item->size);
o_mode = 0;
o_name = NULL;
while (desc.size) {
unsigned mode;
const char *name;
const unsigned char *sha1;
sha1 = tree_entry_extract(&desc, &name, &mode);
if (is_null_sha1(sha1))
has_null_sha1 = 1;
if (strchr(name, '/'))
has_full_path = 1;
if (!*name)
has_empty_name = 1;
if (!strcmp(name, "."))
has_dot = 1;
if (!strcmp(name, ".."))
has_dotdot = 1;
if (!strcmp(name, ".git"))
has_dotgit = 1;
has_zero_pad |= *(char *)desc.buffer == '0';
update_tree_entry(&desc);
switch (mode) {
/*
* Standard modes..
*/
case S_IFREG | 0755:
case S_IFREG | 0644:
case S_IFLNK:
case S_IFDIR:
case S_IFGITLINK:
break;
/*
* This is nonstandard, but we had a few of these
* early on when we honored the full set of mode
* bits..
*/
case S_IFREG | 0664:
if (!strict)
break;
default:
has_bad_modes = 1;
}
if (o_name) {
switch (verify_ordered(o_mode, o_name, mode, name)) {
case TREE_UNORDERED:
not_properly_sorted = 1;
break;
case TREE_HAS_DUPS:
has_dup_entries = 1;
break;
default:
break;
}
}
o_mode = mode;
o_name = name;
}
retval = 0;
if (has_null_sha1)
retval += error_func(&item->object, FSCK_WARN, "contains entries pointing to null sha1");
if (has_full_path)
retval += error_func(&item->object, FSCK_WARN, "contains full pathnames");
if (has_empty_name)
retval += error_func(&item->object, FSCK_WARN, "contains empty pathname");
if (has_dot)
retval += error_func(&item->object, FSCK_WARN, "contains '.'");
if (has_dotdot)
retval += error_func(&item->object, FSCK_WARN, "contains '..'");
if (has_dotgit)
retval += error_func(&item->object, FSCK_WARN, "contains '.git'");
if (has_zero_pad)
retval += error_func(&item->object, FSCK_WARN, "contains zero-padded file modes");
if (has_bad_modes)
retval += error_func(&item->object, FSCK_WARN, "contains bad file modes");
if (has_dup_entries)
retval += error_func(&item->object, FSCK_ERROR, "contains duplicate file entries");
if (not_properly_sorted)
retval += error_func(&item->object, FSCK_ERROR, "not properly sorted");
return retval;
}
static int fsck_ident(char **ident, struct object *obj, fsck_error error_func)
{
if (**ident == '<')
return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing space before email");
*ident += strcspn(*ident, "<>\n");
if (**ident == '>')
return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad name");
if (**ident != '<')
return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing email");
if ((*ident)[-1] != ' ')
return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing space before email");
(*ident)++;
*ident += strcspn(*ident, "<>\n");
if (**ident != '>')
return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad email");
(*ident)++;
if (**ident != ' ')
return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing space before date");
(*ident)++;
if (**ident == '0' && (*ident)[1] != ' ')
return error_func(obj, FSCK_ERROR, "invalid author/committer line - zero-padded date");
*ident += strspn(*ident, "0123456789");
if (**ident != ' ')
return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad date");
(*ident)++;
if ((**ident != '+' && **ident != '-') ||
!isdigit((*ident)[1]) ||
!isdigit((*ident)[2]) ||
!isdigit((*ident)[3]) ||
!isdigit((*ident)[4]) ||
((*ident)[5] != '\n'))
return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad time zone");
(*ident) += 6;
return 0;
}
static int fsck_commit(struct commit *commit, fsck_error error_func)
{
char *buffer = commit->buffer;
unsigned char tree_sha1[20], sha1[20];
struct commit_graft *graft;
int parents = 0;
int err;
if (commit->date == ULONG_MAX)
return error_func(&commit->object, FSCK_ERROR, "invalid author/committer line");
if (memcmp(buffer, "tree ", 5))
return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'tree' line");
if (get_sha1_hex(buffer+5, tree_sha1) || buffer[45] != '\n')
return error_func(&commit->object, FSCK_ERROR, "invalid 'tree' line format - bad sha1");
buffer += 46;
while (!memcmp(buffer, "parent ", 7)) {
if (get_sha1_hex(buffer+7, sha1) || buffer[47] != '\n')
return error_func(&commit->object, FSCK_ERROR, "invalid 'parent' line format - bad sha1");
buffer += 48;
parents++;
}
graft = lookup_commit_graft(commit->object.sha1);
if (graft) {
struct commit_list *p = commit->parents;
parents = 0;
while (p) {
p = p->next;
parents++;
}
if (graft->nr_parent == -1 && !parents)
; /* shallow commit */
else if (graft->nr_parent != parents)
return error_func(&commit->object, FSCK_ERROR, "graft objects missing");
} else {
struct commit_list *p = commit->parents;
while (p && parents) {
p = p->next;
parents--;
}
if (p || parents)
return error_func(&commit->object, FSCK_ERROR, "parent objects missing");
}
if (memcmp(buffer, "author ", 7))
return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'author' line");
buffer += 7;
err = fsck_ident(&buffer, &commit->object, error_func);
if (err)
return err;
if (memcmp(buffer, "committer ", strlen("committer ")))
return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'committer' line");
buffer += strlen("committer ");
err = fsck_ident(&buffer, &commit->object, error_func);
if (err)
return err;
if (!commit->tree)
return error_func(&commit->object, FSCK_ERROR, "could not load commit's tree %s", sha1_to_hex(tree_sha1));
return 0;
}
static int fsck_tag(struct tag *tag, fsck_error error_func)
{
struct object *tagged = tag->tagged;
if (!tagged)
return error_func(&tag->object, FSCK_ERROR, "could not load tagged object");
return 0;
}
int fsck_object(struct object *obj, int strict, fsck_error error_func)
{
if (!obj)
return error_func(obj, FSCK_ERROR, "no valid object to fsck");
if (obj->type == OBJ_BLOB)
return 0;
if (obj->type == OBJ_TREE)
return fsck_tree((struct tree *) obj, strict, error_func);
if (obj->type == OBJ_COMMIT)
return fsck_commit((struct commit *) obj, error_func);
if (obj->type == OBJ_TAG)
return fsck_tag((struct tag *) obj, error_func);
return error_func(obj, FSCK_ERROR, "unknown type '%d' (internal fsck error)",
obj->type);
}
int fsck_error_function(struct object *obj, int type, const char *fmt, ...)
{
va_list ap;
struct strbuf sb = STRBUF_INIT;
strbuf_addf(&sb, "object %s:", sha1_to_hex(obj->sha1));
va_start(ap, fmt);
strbuf_vaddf(&sb, fmt, ap);
va_end(ap);
error("%s", sb.buf);
strbuf_release(&sb);
return 1;
}
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