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From: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
To: git@vger.kernel.org
Cc: "Junio C Hamano" <gitster@pobox.com>, "Jeff King" <peff@peff.net>,
	"Han-Wen Nienhuys" <hanwen@google.com>,
	"Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Subject: [PATCH 16/20] refs API: make resolve_ref_unsafe() not set errno
Date: Thu, 14 Oct 2021 02:06:28 +0200	[thread overview]
Message-ID: <patch-16.20-888b1884c29-20211013T235900Z-avarab@gmail.com> (raw)
In-Reply-To: <cover-00.20-00000000000-20211013T235900Z-avarab@gmail.com>

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 e47c6cafcb5 (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>
---
 refs.c      |  6 ++++--
 sequencer.c | 10 ++++++++--
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/refs.c b/refs.c
index f2a56a216c3..4b0c1a30a18 100644
--- a/refs.c
+++ b/refs.c
@@ -1784,8 +1784,10 @@ 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,
diff --git a/sequencer.c b/sequencer.c
index 64b1f2e681c..7052f791410 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -1281,6 +1281,8 @@ 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)
@@ -1330,9 +1332,13 @@ 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
-- 
2.33.1.1346.g48288c3c089


  parent reply	other threads:[~2021-10-14  0:07 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-14  0:06 [PATCH 00/20] refs: stop having the API set "errno" Ævar Arnfjörð Bjarmason
2021-10-14  0:06 ` [PATCH 01/20] branch tests: test for errno propagating on failing read Ævar Arnfjörð Bjarmason
2021-10-14  1:57   ` Eric Sunshine
2021-10-14  0:06 ` [PATCH 02/20] refs API: add a version of refs_resolve_ref_unsafe() with "errno" Ævar Arnfjörð Bjarmason
2021-10-14  0:06 ` [PATCH 03/20] refs API: make refs_read_raw_ref() not set errno Ævar Arnfjörð Bjarmason
2021-10-14  0:06 ` [PATCH 04/20] refs API: make parse_loose_ref_contents() " Ævar Arnfjörð Bjarmason
2021-10-14  0:06 ` [PATCH 05/20] refs API: make refs_rename_ref_available() static Ævar Arnfjörð Bjarmason
2021-10-14  0:06 ` [PATCH 06/20] refs/files: remove "name exist?" check in lock_ref_oid_basic() Ævar Arnfjörð Bjarmason
2021-10-14 20:53   ` Junio C Hamano
2021-10-14  0:06 ` [PATCH 07/20] refs API: remove refs_read_ref_full() wrapper Ævar Arnfjörð Bjarmason
2021-10-14  0:06 ` [PATCH 08/20] refs API: make resolve_gitlink_ref() not set errno Ævar Arnfjörð Bjarmason
2021-10-14  0:06 ` [PATCH 09/20] refs API: make loose_fill_ref_dir() " Ævar Arnfjörð Bjarmason
2021-10-14  0:06 ` [PATCH 10/20] refs API: make files_copy_or_rename_ref() et al " Ævar Arnfjörð Bjarmason
2021-10-14  0:06 ` [PATCH 11/20] refs API: ignore errno in worktree.c's add_head_info() Ævar Arnfjörð Bjarmason
2021-10-14  0:06 ` [PATCH 12/20] refs API: ignore errno in worktree.c's find_shared_symref() Ævar Arnfjörð Bjarmason
2021-10-14  0:06 ` [PATCH 13/20] refs tests: ignore ignore errno in test-ref-store helper Ævar Arnfjörð Bjarmason
2021-10-14  0:06 ` [PATCH 14/20] refs API: make refs_resolve_refdup() not set errno Ævar Arnfjörð Bjarmason
2021-10-14  0:06 ` [PATCH 15/20] refs API: make refs_ref_exists() " Ævar Arnfjörð Bjarmason
2021-10-14  0:06 ` Ævar Arnfjörð Bjarmason [this message]
2021-10-14  0:06 ` [PATCH 17/20] refs API: make expand_ref() & repo_dwim_log() " Ævar Arnfjörð Bjarmason
2021-10-14  0:06 ` [PATCH 18/20] refs API: don't expose "errno" in run_transaction_hook() Ævar Arnfjörð Bjarmason
2021-10-14  0:06 ` [PATCH 19/20] refs API: post-migration API renaming [1/2] Ævar Arnfjörð Bjarmason
2021-10-14  0:06 ` [PATCH 20/20] refs API: post-migration API renaming [2/2] Ævar Arnfjörð Bjarmason
2021-10-16  9:39 ` [PATCH v2 00/21] refs: stop having the API set "errno" Ævar Arnfjörð Bjarmason
2021-10-16  9:39   ` [PATCH v2 01/21] branch tests: test for errno propagating on failing read Ævar Arnfjörð Bjarmason
2021-10-16  9:39   ` [PATCH v2 02/21] refs API: add a version of refs_resolve_ref_unsafe() with "errno" Ævar Arnfjörð Bjarmason
2021-10-16  9:39   ` [PATCH v2 03/21] refs API: make refs_read_raw_ref() not set errno Ævar Arnfjörð Bjarmason
2021-10-16  9:39   ` [PATCH v2 04/21] refs API: make parse_loose_ref_contents() " Ævar Arnfjörð Bjarmason
2021-10-16  9:39   ` [PATCH v2 05/21] refs API: make refs_rename_ref_available() static Ævar Arnfjörð Bjarmason
2021-10-16  9:39   ` [PATCH v2 06/21] reflog tests: add --updateref tests Ævar Arnfjörð Bjarmason
2021-10-16  9:39   ` [PATCH v2 07/21] refs/files: remove "name exist?" check in lock_ref_oid_basic() Ævar Arnfjörð Bjarmason
2021-10-16  9:39   ` [PATCH v2 08/21] refs API: remove refs_read_ref_full() wrapper Ævar Arnfjörð Bjarmason
2021-10-16  9:39   ` [PATCH v2 09/21] refs API: make resolve_gitlink_ref() not set errno Ævar Arnfjörð Bjarmason
2021-10-16  9:39   ` [PATCH v2 10/21] refs API: make loose_fill_ref_dir() " Ævar Arnfjörð Bjarmason
2021-10-16  9:39   ` [PATCH v2 11/21] refs API: make files_copy_or_rename_ref() et al " Ævar Arnfjörð Bjarmason
2021-10-16  9:39   ` [PATCH v2 12/21] refs API: ignore errno in worktree.c's add_head_info() Ævar Arnfjörð Bjarmason
2021-10-16  9:39   ` [PATCH v2 13/21] refs API: ignore errno in worktree.c's find_shared_symref() Ævar Arnfjörð Bjarmason
2021-10-16  9:39   ` [PATCH v2 14/21] refs tests: ignore ignore errno in test-ref-store helper Ævar Arnfjörð Bjarmason
2021-10-16  9:39   ` [PATCH v2 15/21] refs API: make refs_resolve_refdup() not set errno Ævar Arnfjörð Bjarmason
2021-10-16  9:39   ` [PATCH v2 16/21] refs API: make refs_ref_exists() " Ævar Arnfjörð Bjarmason
2021-10-16  9:39   ` [PATCH v2 17/21] refs API: make resolve_ref_unsafe() " Ævar Arnfjörð Bjarmason
2021-10-16  9:39   ` [PATCH v2 18/21] refs API: make expand_ref() & repo_dwim_log() " Ævar Arnfjörð Bjarmason
2021-10-16  9:39   ` [PATCH v2 19/21] refs API: don't expose "errno" in run_transaction_hook() Ævar Arnfjörð Bjarmason
2021-10-16  9:39   ` [PATCH v2 20/21] refs API: post-migration API renaming [1/2] Ævar Arnfjörð Bjarmason
2021-10-16  9:39   ` [PATCH v2 21/21] refs API: post-migration API renaming [2/2] Ævar Arnfjörð Bjarmason

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