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path.c: optimize adjust_shared_perm()

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Sometimes the chown() function is called even when not needed (This
can be provoked by running t1301, and adding some debug code).

Save a chmod from 400 to 400, or from 600 to 600 on these files:

 .git/info/refs+
 .git/objects/info/packs+

Save chmod on directories from 2770 to 2770:

 .git/refs
 .git/refs/heads
 .git/refs/tags

Signed-off-by: Torsten Bögershausen <tboegi@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Torsten Bögershausen 2013-03-30 10:53:47 +01:00 committed by Junio C Hamano
parent 3a429d3b8d
commit cbe43b8473
1 changed files with 23 additions and 19 deletions
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42
path.c
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@ -396,22 +396,14 @@ const char *enter_repo(const char *path, int strict)
return NULL;
}
int adjust_shared_perm(const char *path)
static int calc_shared_perm(int mode)
{
int tweak, shared, orig_mode, mode;
int tweak;
if (!shared_repository) {
return 0;
}
if (get_st_mode_bits(path, &mode) < 0)
return -1;
orig_mode = mode;
if (shared_repository < 0)
shared = -shared_repository;
tweak = -shared_repository;
else
shared = shared_repository;
tweak = shared;
tweak = shared_repository;
if (!(mode & S_IWUSR))
tweak &= ~0222;
@ -423,16 +415,28 @@ int adjust_shared_perm(const char *path)
else
mode |= tweak;
if (S_ISDIR(mode)) {
return mode;
}
int adjust_shared_perm(const char *path)
{
int old_mode, new_mode;
if (!shared_repository)
return 0;
if (get_st_mode_bits(path, &old_mode) < 0)
return -1;
new_mode = calc_shared_perm(old_mode);
if (S_ISDIR(old_mode)) {
/* Copy read bits to execute bits */
mode |= (shared & 0444) >> 2;
mode |= FORCE_DIR_SET_GID;
new_mode |= (new_mode & 0444) >> 2;
new_mode |= FORCE_DIR_SET_GID;
}
if (((shared_repository < 0
? (orig_mode & (FORCE_DIR_SET_GID | 0777))
: (orig_mode & mode)) != mode) &&
chmod(path, (mode & ~S_IFMT)) < 0)
if (((old_mode ^ new_mode) & ~S_IFMT) &&
chmod(path, (new_mode & ~S_IFMT)) < 0)
return -2;
return 0;
}