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check_path(): allow symlinked directories to checkout-index --prefix

Merlyn noticed that Documentation/ no longer correctly
removes old installed documents when the target directory has a leading
path that is a symlink.  It turns out that "checkout-index --prefix" was
broken by recent b6986d8 (git-checkout: be careful about untracked
symlinks, 2009-07-29).

I suspect has_symlink_leading_path() could learn the third parameter
(prefix that is allowed to be symlinked directories) to allow us to retire
a similar function has_dirs_only_path().

Another avenue of fixing this I considered was to get rid of base_dir and
base_dir_len from "struct checkout", and instead make "git checkout-index"
when run with --prefix mkdir the leading path and chdir in there.  It
might be the best longer term solution to this issue, as the base_dir
feature is used only by that rather obscure codepath as far as I know.

But at least this patch should fix this breakage.

Signed-off-by: Junio C Hamano <>
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gitster committed Aug 17, 2009
1 parent b6986d8 commit da02ca508b842e61c71d920310ff30bbe0238993
Showing with 18 additions and 5 deletions.
  1. +1 −1 cache.h
  2. +8 −4 entry.c
  3. +9 −0 t/
@@ -469,7 +469,7 @@ extern int index_path(unsigned char *sha1, const char *path, struct stat *st, in
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);
+extern int check_path(const char *path, int len, struct stat *st, int skiplen);
#define REFRESH_REALLY 0x0001 /* ignore_valid */
#define REFRESH_UNMERGED 0x0002 /* allow unmerged */
12 entry.c
@@ -177,11 +177,15 @@ static int write_entry(struct cache_entry *ce, char *path, const struct checkout
* This is like 'lstat()', except it refuses to follow symlinks
- * in the path.
+ * in the path, after skipping "skiplen".
-int check_path(const char *path, int len, struct stat *st)
+int check_path(const char *path, int len, struct stat *st, int skiplen)
- if (has_symlink_leading_path(path, len)) {
+ const char *slash = path + len;
+ while (path < slash && *slash != '/')
+ slash--;
+ if (!has_dirs_only_path(path, slash - path, skiplen)) {
errno = ENOENT;
return -1;
@@ -201,7 +205,7 @@ int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *t
strcpy(path + len, ce->name);
len += ce_namelen(ce);
- if (!check_path(path, len, &st)) {
+ if (!check_path(path, len, &st, state->base_dir_len)) {
unsigned changed = ce_match_stat(ce, &st, CE_MATCH_IGNORE_VALID);
if (!changed)
return 0;
@@ -48,4 +48,13 @@ test_expect_success \
'git checkout-index conflicting paths.' \
'test -f path0 && test -d path1 && test -f path1/file1'
+test_expect_success SYMLINKS 'checkout-index -f twice with --prefix' '
+ mkdir -p tar/get &&
+ ln -s tar/get there &&
+ echo first &&
+ git checkout-index -a -f --prefix=there/ &&
+ echo second &&
+ git checkout-index -a -f --prefix=there/

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