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apply: correctly reverse patch's pre- and post-image mode bits

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When parsing the patch header, unless it is a patch that changes
file modes, we only read the mode bits into the .old_mode member of
the patch structure and leave .new_mode member as initialized, i.e.,
to 0.  Later when we need the original mode bits, we consult .old_mode.

However, reverse_patches() that is used to swap the names and modes
of the preimage and postimage files is not aware of this convention,
leading the .old_mode to be 0 while the mode we read from the patch
is left in .new_mode.

Only swap .old_mode and .new_mode when .new_mode is not 0 (i.e. we
saw a patch that modifies the filemode and know what the new mode
is).  When .new_mode is set to 0, it means the preimage and the
postimage files have the same mode (which is in the .old_mode member)
and when applying such a patch in reverse, the value in .old_mode is
what we expect the (reverse-) preimage file to have.

Reported-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano 2023-12-26 15:32:17 -08:00
parent 0482c32c33
commit 01aff0ae85
1 changed files with 4 additions and 4 deletions
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8
apply.c
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@ -2220,7 +2220,8 @@ static void reverse_patches(struct patch *p)
struct fragment *frag = p->fragments;
SWAP(p->new_name, p->old_name);
SWAP(p->new_mode, p->old_mode);
if (p->new_mode)
SWAP(p->new_mode, p->old_mode);
SWAP(p->is_new, p->is_delete);
SWAP(p->lines_added, p->lines_deleted);
SWAP(p->old_oid_prefix, p->new_oid_prefix);
@ -3780,9 +3781,8 @@ static int check_preimage(struct apply_state *state,
if (!state->cached && !previous) {
if (!trust_executable_bit)
st_mode = (*ce && (*ce)->ce_mode) ? (*ce)->ce_mode :
(state->apply_in_reverse
? patch->new_mode : patch->old_mode);
st_mode = (*ce && (*ce)->ce_mode)
? (*ce)->ce_mode : patch->old_mode;
else
st_mode = ce_mode_from_stat(*ce, st->st_mode);
}