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refs API: make resolve_ref_unsafe() not set errno

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Change the resolve_ref_unsafe() wrapper function to use the underlying
refs_werrres_ref_unsafe() directly.

From a reading of the callers I determined that the only one who cared
about errno was a sequencer.c caller added in e47c6cafcb (commit:
move print_commit_summary() to libgit, 2017-11-24), I'm migrating it
to using refs_werrres_ref_unsafe() directly.

This adds another "set errno" instance, but in this case it's OK and
idiomatic. We are setting it just before calling die_errno(). We could
have some hypothetical die_errno_var(&saved_errno, ...) here, but I
don't think it's worth it. The problem with errno is subtle action at
distance, not this sort of thing. We already use this pattern in a
couple of places in wrapper.c

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Ævar Arnfjörð Bjarmason 2021-10-16 11:39:23 +02:00 committed by Junio C Hamano
parent 1e3ccb552f
commit ed90f04155
2 changed files with 12 additions and 4 deletions
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6
refs.c
View file

@ -1785,8 +1785,10 @@ int refs_init_db(struct strbuf *err)
const char *resolve_ref_unsafe(const char *refname, int resolve_flags,
struct object_id *oid, int *flags)
{
return refs_resolve_ref_unsafe(get_main_ref_store(the_repository), refname,
resolve_flags, oid, flags);
int ignore_errno;
return refs_werrres_ref_unsafe(get_main_ref_store(the_repository), refname,
resolve_flags, oid, flags, &ignore_errno);
}
int resolve_gitlink_ref(const char *submodule, const char *refname,

10
sequencer.c
View file

@ -1282,6 +1282,8 @@ void print_commit_summary(struct repository *r,
struct pretty_print_context pctx = {0};
struct strbuf author_ident = STRBUF_INIT;
struct strbuf committer_ident = STRBUF_INIT;
struct ref_store *refs;
int resolve_errno;
commit = lookup_commit(r, oid);
if (!commit)
@ -1331,9 +1333,13 @@ void print_commit_summary(struct repository *r,
rev.diffopt.break_opt = 0;
diff_setup_done(&rev.diffopt);
head = resolve_ref_unsafe("HEAD", 0, NULL, NULL);
if (!head)
refs = get_main_ref_store(the_repository);
head = refs_werrres_ref_unsafe(refs, "HEAD", 0, NULL, NULL,
&resolve_errno);
if (!head) {
errno = resolve_errno;
die_errno(_("unable to resolve HEAD after creating commit"));
}
if (!strcmp(head, "HEAD"))
head = _("detached HEAD");
else