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git-checkout: be careful about untracked symlinks

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This fixes the case where an untracked symlink that points at a directory
with tracked paths confuses the checkout logic, demostrated in t6035.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Linus Torvalds 2009-07-29 20:22:25 -07:00 committed by Junio C Hamano
parent 77716755cb
commit b6986d8a75
3 changed files with 18 additions and 2 deletions
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3
cache.h
View file

@ -468,6 +468,9 @@ extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_obje
extern int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object);
extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
/* "careful lstat()" */
extern int check_path(const char *path, int len, struct stat *st);
#define REFRESH_REALLY 0x0001 /* ignore_valid */
#define REFRESH_UNMERGED 0x0002 /* allow unmerged */
#define REFRESH_QUIET 0x0004 /* be quiet about it */

15
entry.c
View file

@ -175,6 +175,19 @@ static int write_entry(struct cache_entry *ce, char *path, const struct checkout
return 0;
}
/*
* This is like 'lstat()', except it refuses to follow symlinks
* in the path.
*/
int check_path(const char *path, int len, struct stat *st)
{
if (has_symlink_leading_path(path, len)) {
errno = ENOENT;
return -1;
}
return lstat(path, st);
}
int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath)
{
static char path[PATH_MAX + 1];
@ -188,7 +201,7 @@ int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *t
strcpy(path + len, ce->name);
len += ce_namelen(ce);
if (!lstat(path, &st)) {
if (!check_path(path, len, &st)) {
unsigned changed = ce_match_stat(ce, &st, CE_MATCH_IGNORE_VALID);
if (!changed)
return 0;

2
t/t6035-merge-dir-to-symlink.sh
View file

@ -17,7 +17,7 @@ test_expect_success 'create a commit where dir a/b changed to symlink' '
git commit -m "dir to symlink"
'
test_expect_failure 'keep a/b-2/c/d across checkout' '
test_expect_success 'keep a/b-2/c/d across checkout' '
git checkout HEAD^0 &&
git reset --hard master &&
git rm --cached a/b &&