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adjust_shared_perm(): leave g+s alone when the group does not matter

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Julien Moutinho reports that in an environment where directory does
not have BSD group semantics and requires the g+s to be set (aka
FORCE_DIR_SET_GID), but the system forbids chmod() to touch the g+s
bit, adjust_shared_perm() fails even when the repository is for
private use with perm = 0600, because we unconditionally try to set
the g+s bit.

When we grant extra access based on group membership (i.e. the
directory has either g+r or g+w bit set), which group the directory
and its contents are owned by matters.  But otherwise (e.g. perm is
set to 0600, in Julien's case), flipping g+s bit is not necessary.

Reported-by: Julien Moutinho <julm+git@sourcephile.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano 2022-10-28 14:16:09 -07:00
parent 63bba4fdd8
commit 671bbf7b9d
1 changed files with 7 additions and 1 deletions
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8
path.c
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@ -901,7 +901,13 @@ int adjust_shared_perm(const char *path)
if (S_ISDIR(old_mode)) {
/* Copy read bits to execute bits */
new_mode |= (new_mode & 0444) >> 2;
new_mode |= FORCE_DIR_SET_GID;
/*
* g+s matters only if any extra access is granted
* based on group membership.
*/
if (FORCE_DIR_SET_GID && (new_mode & 060))
new_mode |= FORCE_DIR_SET_GID;
}
if (((old_mode ^ new_mode) & ~S_IFMT) &&