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read-cache.c: move tempfile creation/cleanup out of write_shared_index 

For one thing, we have more consistent cleanup procedure now and always
keep errno intact.

The real purpose is the ability to break out of write_locked_index()
early when mks_tempfile() fails in the next patch. It's more awkward to
do it if this mks_tempfile() is still inside write_shared_index().

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Nguyễn Thái Ngọc Duy 2018-01-14 17:18:19 +07:00 committed by Junio C Hamano
parent 7db2d08cdc
commit 59f9d2dd60
1 changed files with 17 additions and 16 deletions
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33
read-cache.c
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@ -2472,31 +2472,18 @@ static int clean_shared_index_files(const char *current_hex)
}
static int write_shared_index(struct index_state *istate,
struct lock_file *lock, unsigned flags)
struct tempfile **temp)
{
struct tempfile *real_temp;
struct tempfile **temp = &real_temp;
struct split_index *si = istate->split_index;
int ret;
real_temp = mks_tempfile(git_path("sharedindex_XXXXXX"));
if (!real_temp) {
hashclr(si->base_sha1);
return do_write_locked_index(istate, lock, flags);
}
temp = &real_temp;
move_cache_to_base_index(istate);
ret = do_write_index(si->base, *temp, 1);
if (ret) {
delete_tempfile(temp);
if (ret)
return ret;
}
ret = adjust_shared_perm(get_tempfile_path(*temp));
if (ret) {
int save_errno = errno;
error("cannot fix permission bits on %s", get_tempfile_path(*temp));
delete_tempfile(temp);
errno = save_errno;
return ret;
}
ret = rename_tempfile(temp,
@ -2567,7 +2554,21 @@ int write_locked_index(struct index_state *istate, struct lock_file *lock,
new_shared_index = istate->cache_changed & SPLIT_INDEX_ORDERED;
if (new_shared_index) {
ret = write_shared_index(istate, lock, flags);
struct tempfile *temp;
int saved_errno;
temp = mks_tempfile(git_path("sharedindex_XXXXXX"));
if (!temp) {
hashclr(si->base_sha1);
ret = do_write_locked_index(istate, lock, flags);
} else
ret = write_shared_index(istate, &temp);
saved_errno = errno;
if (is_tempfile_active(temp))
delete_tempfile(&temp);
errno = saved_errno;
if (ret)
goto out;
}