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From: Han-Wen Nienhuys <hanwen@google.com>
To: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Cc: Han-Wen Nienhuys via GitGitGadget <gitgitgadget@gmail.com>,
	git@vger.kernel.org, Jonathan Tan <jonathantanmy@google.com>,
	Han-Wen Nienhuys <hanwenn@gmail.com>
Subject: Re: [PATCH v5 2/6] refs/files-backend: stop setting errno from lock_ref_oid_basic
Date: Tue, 13 Jul 2021 10:00:19 +0200	[thread overview]
Message-ID: <CAFQ2z_OftKcmR3ZgogAjiSGEBNmB7Akb01HLy9Abc0xSR5oSHQ@mail.gmail.com> (raw)
In-Reply-To: <87lf6d3wbz.fsf@evledraar.gmail.com>

On Sun, Jul 11, 2021 at 1:48 PM Ævar Arnfjörð Bjarmason
<avarab@gmail.com> wrote:
>
>
> On Wed, Jul 07 2021, Han-Wen Nienhuys via GitGitGadget wrote:
>
> >  /*
> >   * Locks a ref returning the lock on success and NULL on failure.
> > - * On failure errno is set to something meaningful.
> >   */
> >  static struct ref_lock *lock_ref_oid_basic(struct files_ref_store *refs,
> >                                          const char *refname,
> > @@ -922,7 +921,6 @@ static struct ref_lock *lock_ref_oid_basic(struct files_ref_store *refs,
> >  {
> >       struct strbuf ref_file = STRBUF_INIT;
> >       struct ref_lock *lock;
> > -     int last_errno = 0;
> >       int mustexist = (old_oid && !is_null_oid(old_oid));
> >       int resolve_flags = RESOLVE_REF_NO_RECURSE;
> >       int resolved;
> > @@ -949,7 +947,6 @@ static struct ref_lock *lock_ref_oid_basic(struct files_ref_store *refs,
> >                * to remain.
> >                */
> >               if (remove_empty_directories(&ref_file)) {
> > -                     last_errno = errno;
> >                       if (!refs_verify_refname_available(
> >                                           &refs->base,
> >                                           refname, extras, skip, err))
> > @@ -962,10 +959,13 @@ static struct ref_lock *lock_ref_oid_basic(struct files_ref_store *refs,
> >                                                    &lock->old_oid, type);
> >       }
> >       if (!resolved) {
> > -             last_errno = errno;
> > +             int last_errno = errno;
> >               if (last_errno != ENOTDIR ||
> > -                 !refs_verify_refname_available(&refs->base, refname,
> > -                                                extras, skip, err))
> > +                 /* in case of D/F conflict, try to generate a better error
> > +                  * message. If that fails, fall back to strerror(ENOTDIR).
> > +                  */
> > +                 !refs_verify_refname_available(&refs->base, refname, extras,
> > +                                                skip, err))
> >                       strbuf_addf(err, "unable to resolve reference '%s': %s",
> >                                   refname, strerror(last_errno));
>
> I don't think it's some dealbreaker and we can move on, but just FWIW I
> think what I mentioned ending in your
> https://lore.kernel.org/git/CAFQ2z_NpyJQLuM70MhJ8K1h2v3QXFuAZRjN=SvSsjnukNRJ8pw@mail.gmail.com/
> is still outstanding.
>
> I.e. you added the comment, which is just says what the error emitting
> looks like, that's all well & good.
>
> But what I was pointing out that it didn't make sense to do any
> "last_errno" here at all anymore. You pointed to 5b2d8d6f218
> (lock_ref_sha1_basic(): improve diagnostics for ref D/F conflicts,
> 2015-05-11), we started setting "last_errno" there, but that was *not*
> to avoid clobbering between the !resolved and the
> strbuf_add(strerror(last_errno)) here, but rather to carry the
> "last_errno" forward to the end of this lock_ref_oid_basic(), because
> other things (after this hunk) might reset/clear errno.

I disagree. In your suggested change

> +       if (!resolved &&
> +           (errno != ENOTDIR ||
> +            /* in case of D/F conflict, try to generate a better error
> +             * message. If that fails, fall back to strerror(ENOTDIR).
> +             */
> +            !refs_verify_refname_available(&refs->base, refname, extras,
> +                                           skip, err))) {
> +               strbuf_addf(err, "unable to resolve reference '%s': %s",
> +                           refname, strerror(errno));
>                 goto error_return;

the refs_verify_refname_available() call happens only if
errno==ENOTDIR. The call might clobber the ENOTDIR errno and then
fail. Then we'd be printing the last errno that
refs_verify_refname_available() saw, which may be different from
ENOTDIR.

Other than that, for clarity's sake, it's always better to avoid the
use of global errno if we can.

--
Han-Wen Nienhuys - Google Munich
I work 80%. Don't expect answers from me on Fridays.
--
Google Germany GmbH, Erika-Mann-Strasse 33, 80636 Munich
Registergericht und -nummer: Hamburg, HRB 86891
Sitz der Gesellschaft: Hamburg
Geschäftsführer: Paul Manicle, Halimah DeLaine Prado

  reply	other threads:[~2021-07-13  8:00 UTC|newest]

Thread overview: 148+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-29 15:32 [PATCH 0/8] refs: cleanup errno sideband ref related functions Han-Wen Nienhuys via GitGitGadget
2021-04-29 15:32 ` [PATCH 1/8] refs: remove EINVAL specification from the errno sideband in read_raw_ref_fn Han-Wen Nienhuys via GitGitGadget
2021-04-30  2:38   ` Junio C Hamano
2021-05-19 12:25     ` Han-Wen Nienhuys
2021-06-03  2:19   ` Jonathan Tan
2021-06-09 11:28     ` Han-Wen Nienhuys
2021-04-29 15:32 ` [PATCH 2/8] refs/files-backend: stop setting errno from lock_ref_oid_basic Han-Wen Nienhuys via GitGitGadget
2021-04-30  3:10   ` Junio C Hamano
2021-05-19 12:29     ` Han-Wen Nienhuys
2021-06-03  2:33   ` Jonathan Tan
2021-06-10 10:02     ` Han-Wen Nienhuys
2021-04-29 15:32 ` [PATCH 3/8] refs: make errno output explicit for read_raw_ref_fn Han-Wen Nienhuys via GitGitGadget
2021-04-30  3:34   ` Junio C Hamano
2021-04-30  6:02     ` Junio C Hamano
2021-05-19 12:33       ` Han-Wen Nienhuys
2021-06-03  2:37   ` Jonathan Tan
2021-06-10 10:05     ` Han-Wen Nienhuys
2021-04-29 15:32 ` [PATCH 4/8] refs: make errno output explicit for refs_resolve_ref_unsafe Han-Wen Nienhuys via GitGitGadget
2021-06-03  2:51   ` Jonathan Tan
2021-06-10 11:27     ` Han-Wen Nienhuys
2021-04-29 15:32 ` [PATCH 5/8] refs: add failure_errno to refs_read_raw_ref() signature Han-Wen Nienhuys via GitGitGadget
2021-04-29 15:32 ` [PATCH 6/8] refs: clear errno return in refs_resolve_ref_unsafe() Han-Wen Nienhuys via GitGitGadget
2021-06-03  2:53   ` Jonathan Tan
2021-06-10 11:45     ` Han-Wen Nienhuys
2021-04-29 15:32 ` [PATCH 7/8] refs: stop setting EINVAL and ELOOP in symref resolution Han-Wen Nienhuys via GitGitGadget
2021-06-03  2:55   ` Jonathan Tan
2021-06-10 11:58     ` Han-Wen Nienhuys
2021-04-29 15:32 ` [PATCH 8/8] refs: explicitly propagate errno from refs_read_raw_ref Han-Wen Nienhuys via GitGitGadget
2021-06-03  2:13 ` [PATCH 0/8] refs: cleanup errno sideband ref related functions Jonathan Tan
2021-06-09 11:29   ` Han-Wen Nienhuys
2021-06-10 12:57 ` [PATCH v2 " Han-Wen Nienhuys via GitGitGadget
2021-06-10 12:57   ` [PATCH v2 1/8] refs: remove EINVAL errno output from specification of read_raw_ref_fn Han-Wen Nienhuys via GitGitGadget
2021-06-10 12:57   ` [PATCH v2 2/8] refs/files-backend: stop setting errno from lock_ref_oid_basic Han-Wen Nienhuys via GitGitGadget
2021-07-01 11:13     ` Ævar Arnfjörð Bjarmason
2021-07-05 14:16       ` Han-Wen Nienhuys
2021-06-10 12:57   ` [PATCH v2 3/8] refs: make errno output explicit for read_raw_ref_fn Han-Wen Nienhuys via GitGitGadget
2021-07-01 11:34     ` Ævar Arnfjörð Bjarmason
2021-07-05 14:34       ` Han-Wen Nienhuys
2021-06-10 12:57   ` [PATCH v2 4/8] refs: make errno output explicit for refs_resolve_ref_unsafe Han-Wen Nienhuys via GitGitGadget
2021-07-01 11:56     ` Ævar Arnfjörð Bjarmason
2021-06-10 12:57   ` [PATCH v2 5/8] refs: use refs_resolve_ref_unsafe_with_errno() where needed Han-Wen Nienhuys via GitGitGadget
2021-07-01 11:58     ` Ævar Arnfjörð Bjarmason
2021-06-10 12:57   ` [PATCH v2 6/8] refs: add failure_errno to refs_read_raw_ref() signature Han-Wen Nienhuys via GitGitGadget
2021-07-01 12:06     ` Ævar Arnfjörð Bjarmason
2021-06-10 12:57   ` [PATCH v2 7/8] refs: clear errno return in refs_resolve_ref_unsafe() Han-Wen Nienhuys via GitGitGadget
2021-07-01 12:19     ` Ævar Arnfjörð Bjarmason
2021-06-10 12:57   ` [PATCH v2 8/8] refs: explicitly propagate errno from refs_read_raw_ref Han-Wen Nienhuys via GitGitGadget
2021-07-01 12:26     ` Ævar Arnfjörð Bjarmason
2021-07-05 16:09       ` Han-Wen Nienhuys
2021-07-05 19:08         ` Ævar Arnfjörð Bjarmason
2021-07-05 19:39           ` Han-Wen Nienhuys
2021-06-14 10:10   ` [PATCH v2 0/8] refs: cleanup errno sideband ref related functions Han-Wen Nienhuys
2021-07-05 20:56   ` [PATCH v3 0/5] " Han-Wen Nienhuys via GitGitGadget
2021-07-05 20:56     ` [PATCH v3 1/5] refs: remove EINVAL errno output from specification of read_raw_ref_fn Han-Wen Nienhuys via GitGitGadget
2021-07-05 20:56     ` [PATCH v3 2/5] refs/files-backend: stop setting errno from lock_ref_oid_basic Han-Wen Nienhuys via GitGitGadget
2021-07-05 20:56     ` [PATCH v3 3/5] refs: make errno output explicit for read_raw_ref_fn Han-Wen Nienhuys via GitGitGadget
2021-07-05 20:56     ` [PATCH v3 4/5] refs: add failure_errno to refs_read_raw_ref() signature Han-Wen Nienhuys via GitGitGadget
2021-07-06 19:28       ` Junio C Hamano
2021-07-05 20:56     ` [PATCH v3 5/5] refs: make errno output explicit for refs_resolve_ref_unsafe Han-Wen Nienhuys via GitGitGadget
2021-07-06  0:38     ` [PATCH v3 0/5] refs: cleanup errno sideband ref related functions Ævar Arnfjörð Bjarmason
2021-07-06  9:53       ` Han-Wen Nienhuys
2021-07-06 14:27         ` Ævar Arnfjörð Bjarmason
2021-07-06 18:36           ` Han-Wen Nienhuys
2021-07-06 18:55     ` [PATCH v4 0/6] " Han-Wen Nienhuys via GitGitGadget
2021-07-06 18:55       ` [PATCH v4 1/6] refs: remove EINVAL errno output from specification of read_raw_ref_fn Han-Wen Nienhuys via GitGitGadget
2021-07-06 18:55       ` [PATCH v4 2/6] refs/files-backend: stop setting errno from lock_ref_oid_basic Han-Wen Nienhuys via GitGitGadget
2021-07-06 18:55       ` [PATCH v4 3/6] refs: make errno output explicit for read_raw_ref_fn Han-Wen Nienhuys via GitGitGadget
2021-07-06 18:55       ` [PATCH v4 4/6] refs: add failure_errno to refs_read_raw_ref() signature Han-Wen Nienhuys via GitGitGadget
2021-07-06 19:39         ` Junio C Hamano
2021-07-06 18:55       ` [PATCH v4 5/6] refs: explicitly return failure_errno from parse_loose_ref_contents Han-Wen Nienhuys via GitGitGadget
2021-07-06 19:37         ` Junio C Hamano
2021-07-07  8:20           ` Han-Wen Nienhuys
2021-07-06 18:55       ` [PATCH v4 6/6] refs: make errno output explicit for refs_resolve_ref_unsafe Han-Wen Nienhuys via GitGitGadget
2021-07-07 19:07       ` [PATCH v5 0/6] refs: cleanup errno sideband ref related functions Han-Wen Nienhuys via GitGitGadget
2021-07-07 19:07         ` [PATCH v5 1/6] refs: remove EINVAL errno output from specification of read_raw_ref_fn Han-Wen Nienhuys via GitGitGadget
2021-07-07 19:07         ` [PATCH v5 2/6] refs/files-backend: stop setting errno from lock_ref_oid_basic Han-Wen Nienhuys via GitGitGadget
2021-07-11 11:38           ` Ævar Arnfjörð Bjarmason
2021-07-13  8:00             ` Han-Wen Nienhuys [this message]
2021-07-07 19:07         ` [PATCH v5 3/6] refs: make errno output explicit for read_raw_ref_fn Han-Wen Nienhuys via GitGitGadget
2021-07-11 11:52           ` Ævar Arnfjörð Bjarmason
2021-07-07 19:07         ` [PATCH v5 4/6] refs: add failure_errno to refs_read_raw_ref() signature Han-Wen Nienhuys via GitGitGadget
2021-07-11 11:59           ` Ævar Arnfjörð Bjarmason
2021-07-13  8:02             ` Han-Wen Nienhuys
2021-07-07 19:07         ` [PATCH v5 5/6] refs: explicitly return failure_errno from parse_loose_ref_contents Han-Wen Nienhuys via GitGitGadget
2021-07-11 12:41           ` Ævar Arnfjörð Bjarmason
2021-07-07 19:07         ` [PATCH v5 6/6] refs: make errno output explicit for refs_resolve_ref_unsafe Han-Wen Nienhuys via GitGitGadget
2021-07-07 20:44         ` [PATCH v5 0/6] refs: cleanup errno sideband ref related functions Junio C Hamano
2021-07-11 16:30         ` [PATCH v6? 00/17] refs API: get rid of errno setting entirely Ævar Arnfjörð Bjarmason
2021-07-11 16:30           ` [PATCH v6? 01/17] refs: remove EINVAL errno output from specification of read_raw_ref_fn Ævar Arnfjörð Bjarmason
2021-07-11 16:30           ` [PATCH v6? 02/17] refs/files-backend: stop setting errno from lock_ref_oid_basic Ævar Arnfjörð Bjarmason
2021-07-11 16:30           ` [PATCH v6? 03/17] refs: make errno output explicit for read_raw_ref_fn Ævar Arnfjörð Bjarmason
2021-07-11 16:30           ` [PATCH v6? 04/17] refs: add failure_errno to refs_read_raw_ref() signature Ævar Arnfjörð Bjarmason
2021-07-11 16:30           ` [PATCH v6? 05/17] refs: explicitly return failure_errno from parse_loose_ref_contents Ævar Arnfjörð Bjarmason
2021-07-11 16:30           ` [PATCH v6? 06/17] refs: make errno output explicit for refs_resolve_ref_unsafe Ævar Arnfjörð Bjarmason
2021-07-11 16:30           ` [PATCH v6? 07/17] refs: make errno ignoring explicit in lock_ref_oid_basic() Ævar Arnfjörð Bjarmason
2021-07-11 16:30           ` [PATCH v6? 08/17] refs file-backend.c: stop setting "EBUSY" in verify_lock() Ævar Arnfjörð Bjarmason
2021-07-13  8:08             ` Han-Wen Nienhuys
2021-07-11 16:30           ` [PATCH v6? 09/17] refs file-backend.c: deal with errno directly " Ævar Arnfjörð Bjarmason
2021-07-11 16:30           ` [PATCH v6? 10/17] refs API: remove refs_read_ref_full() wrapper Ævar Arnfjörð Bjarmason
2021-07-11 16:30           ` [PATCH v6? 11/17] refs API: make resolve_gitlink_ref() not set errno Ævar Arnfjörð Bjarmason
2021-07-11 16:30           ` [PATCH v6? 12/17] refs API: make refs_resolve_ref_unsafe() static Ævar Arnfjörð Bjarmason
2021-07-11 16:30           ` [PATCH v6? 13/17] refs API: make refs_resolve_refdup() not set errno Ævar Arnfjörð Bjarmason
2021-07-11 16:30           ` [PATCH v6? 14/17] refs API: make refs_ref_exists() " Ævar Arnfjörð Bjarmason
2021-07-11 16:30           ` [PATCH v6? 15/17] refs API: make resolve_ref_unsafe() " Ævar Arnfjörð Bjarmason
2021-07-13  8:13             ` Han-Wen Nienhuys
2021-07-14  8:32               ` Ævar Arnfjörð Bjarmason
2021-07-11 16:30           ` [PATCH v6? 16/17] refs API: make expand_ref() and repo_dwim_log() " Ævar Arnfjörð Bjarmason
2021-07-11 16:30           ` [PATCH v6? 17/17] refs API: don't leak "errno" in run_transaction_hook() Ævar Arnfjörð Bjarmason
2021-07-13  8:28           ` [PATCH v6? 00/17] refs API: get rid of errno setting entirely Han-Wen Nienhuys
2021-07-13 18:26             ` Ævar Arnfjörð Bjarmason
2021-07-14  8:38               ` Ævar Arnfjörð Bjarmason
2021-07-14  8:43                 ` Han-Wen Nienhuys
2021-07-14 11:43           ` [PATCH v7 0/6] refs: cleanup errno sideband ref related functions Ævar Arnfjörð Bjarmason
2021-07-14 11:43             ` [PATCH v7 1/6] refs: remove EINVAL errno output from specification of read_raw_ref_fn Ævar Arnfjörð Bjarmason
2021-07-14 11:43             ` [PATCH v7 2/6] refs/files-backend: stop setting errno from lock_ref_oid_basic Ævar Arnfjörð Bjarmason
2021-07-14 11:43             ` [PATCH v7 3/6] refs: make errno output explicit for read_raw_ref_fn Ævar Arnfjörð Bjarmason
2021-07-14 11:43             ` [PATCH v7 4/6] refs: add failure_errno to refs_read_raw_ref() signature Ævar Arnfjörð Bjarmason
2021-07-14 11:43             ` [PATCH v7 5/6] refs: explicitly return failure_errno from parse_loose_ref_contents Ævar Arnfjörð Bjarmason
2021-07-14 11:43             ` [PATCH v7 6/6] refs: make errno output explicit for refs_resolve_ref_unsafe Ævar Arnfjörð Bjarmason
2021-07-16 14:22             ` [PATCH v8 0/7] refs: cleanup errno sideband ref related functions Ævar Arnfjörð Bjarmason
2021-07-16 14:22               ` [PATCH v8 1/7] refs file backend: move raceproof_create_file() here Ævar Arnfjörð Bjarmason
2021-07-16 14:22               ` [PATCH v8 2/7] refs: remove EINVAL errno output from specification of read_raw_ref_fn Ævar Arnfjörð Bjarmason
2021-07-16 14:22               ` [PATCH v8 3/7] refs/files-backend: stop setting errno from lock_ref_oid_basic Ævar Arnfjörð Bjarmason
2021-07-16 14:22               ` [PATCH v8 4/7] refs: make errno output explicit for read_raw_ref_fn Ævar Arnfjörð Bjarmason
2021-07-16 14:22               ` [PATCH v8 5/7] refs: add failure_errno to refs_read_raw_ref() signature Ævar Arnfjörð Bjarmason
2021-07-16 14:22               ` [PATCH v8 6/7] refs: explicitly return failure_errno from parse_loose_ref_contents Ævar Arnfjörð Bjarmason
2021-07-16 14:22               ` [PATCH v8 7/7] refs: make errno output explicit for refs_resolve_ref_unsafe Ævar Arnfjörð Bjarmason
2021-07-20 10:33               ` [PATCH v9 0/7] refs: cleanup errno sideband ref related functions Ævar Arnfjörð Bjarmason
2021-07-20 10:33                 ` [PATCH v9 1/7] refs file backend: move raceproof_create_file() here Ævar Arnfjörð Bjarmason
2021-07-20 10:33                 ` [PATCH v9 2/7] refs: remove EINVAL errno output from specification of read_raw_ref_fn Ævar Arnfjörð Bjarmason
2021-07-20 10:33                 ` [PATCH v9 3/7] refs/files-backend: stop setting errno from lock_ref_oid_basic Ævar Arnfjörð Bjarmason
2021-07-20 10:33                 ` [PATCH v9 4/7] refs: make errno output explicit for read_raw_ref_fn Ævar Arnfjörð Bjarmason
2021-08-16 13:00                   ` Han-Wen Nienhuys
2021-07-20 10:33                 ` [PATCH v9 5/7] refs: add failure_errno to refs_read_raw_ref() signature Ævar Arnfjörð Bjarmason
2021-07-20 10:33                 ` [PATCH v9 6/7] refs: explicitly return failure_errno from parse_loose_ref_contents Ævar Arnfjörð Bjarmason
2021-08-13 20:54                   ` Jonathan Tan
2021-07-20 10:33                 ` [PATCH v9 7/7] refs: make errno output explicit for refs_resolve_ref_unsafe Ævar Arnfjörð Bjarmason
2021-07-26 23:49                 ` [PATCH v9 0/7] refs: cleanup errno sideband ref related functions Ævar Arnfjörð Bjarmason
2021-07-27  0:18                   ` Junio C Hamano
2021-08-23 11:52                 ` [PATCH v10 0/8] " Ævar Arnfjörð Bjarmason
2021-08-23 11:52                   ` [PATCH v10 1/8] refs file backend: move raceproof_create_file() here Ævar Arnfjörð Bjarmason
2021-08-23 11:52                   ` [PATCH v10 2/8] refs: remove EINVAL errno output from specification of read_raw_ref_fn Ævar Arnfjörð Bjarmason
2021-08-23 11:52                   ` [PATCH v10 3/8] refs/files-backend: stop setting errno from lock_ref_oid_basic Ævar Arnfjörð Bjarmason
2021-08-23 11:52                   ` [PATCH v10 4/8] refs: make errno output explicit for read_raw_ref_fn Ævar Arnfjörð Bjarmason
2021-08-23 11:52                   ` [PATCH v10 5/8] refs: add failure_errno to refs_read_raw_ref() signature Ævar Arnfjörð Bjarmason
2021-08-23 11:52                   ` [PATCH v10 6/8] branch tests: test for errno propagating on failing read Ævar Arnfjörð Bjarmason
2021-08-23 11:52                   ` [PATCH v10 7/8] refs: explicitly return failure_errno from parse_loose_ref_contents Ævar Arnfjörð Bjarmason
2021-08-23 11:52                   ` [PATCH v10 8/8] refs: make errno output explicit for refs_resolve_ref_unsafe Ævar Arnfjörð Bjarmason

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