From: Teng Long <dyroneteng@gmail.com>
To: gitster@pobox.com
Cc: avarab@gmail.com, derrickstolee@github.com, dyroneteng@gmail.com,
git@jeffhostetler.com, git@vger.kernel.org, me@ttaylorr.com,
tenglong.tl@alibaba-inc.com
Subject: Re: [PATCH v5 3/5] pack-bitmap.c: using error() instead of silently returning -1
Date: Tue, 5 Jul 2022 17:04:54 +0800 [thread overview]
Message-ID: <20220705090454.10686-1-dyroneteng@gmail.com> (raw)
In-Reply-To: <xmqqmtdwk6li.fsf@gitster.g>
On 28 Jun 2022 11:04:09 -0700, Junio C Hamano wrote:
> "stat" -> "fstat" perhaps?
Yes.
> Not a new problem, but before this hunk, we have
>
> fd = git_open(...);
> if (fd < 0)
> return -1;
>
> where it probably is legitimate to ignore ENOENT silently. In
> practice, it may be OK to treat a file that exists but cannot be
> opened for whatever reason, but I do not think it would hurt to
> report such a rare anomaly with a warning, e.g.
>
> if (fd < 0) {
> if (errno != ENOENT)
> warning("'%s' cannot open '%s'",
> strerror(errno), bitmap_name);
> free(bitmap_name);
> return -1;
> }
>
> or something like that perhaps.
Yes.
It's more accurate here with your suggestion. At the same time I
found there actually exists many similar place like "ignore ENOENT
silently" in repo. And I think it's not worth to impove them right now
in this patch, if you want to do that it could in another pathset and
please tell me.
> > @@ -361,7 +361,7 @@ static int open_midx_bitmap_1(struct bitmap_index *bitmap_git,
> > bitmap_git->map_pos = 0;
> > bitmap_git->map = NULL;
> > bitmap_git->midx = NULL;
> > - return -1;
> > + return error(_("cannot open midx bitmap file"));
>
> This is not exactly "cannot open". We opened the file, and found
> there was something we do not like in it. If we failed to find midx
> lacks revindex chunk, we already would have given a warning, and the
> error is not just misleading but is redundant. load_bitmap_header()
> also gives an error() on its own.
>
> I think this patch aims for a good end result, but needs more work.
> At least, checksum mismatch that goes to cleanup also needs to issue
> its own error() and then we can remove this "cannot open" at the end.
Yes, It's detailed here and I missed it, I will fix this in next
patch: return error() when checksum doesn't match and let "cleanup"
return "-1" but not an inaccurate error().
> "stat" -> "fstat"
Yes.
> > @@ -394,7 +394,7 @@ static int open_pack_bitmap_1(struct bitmap_index *bitmap_git, struct packed_git
> >
> > if (!is_pack_valid(packfile)) {
> > close(fd);
> > - return -1;
> > + return error(_("packfile is invalid"));
>
> Same "sometimes redundant" comment applies here, but not due to this
> part of the code but due to the helpers called from is_pack_valid().
Let me try to know about it, the "helpers" means the place where invoke
is_pack_valid() like here. In fact, in is_pack_valid() they already
return the errors in various scenarios, so it would be no need to
return another error.
> Namely, packfile.c::open_packed_git_1() is mostly chatty, but is
> silent upon "unable to open" and "unable to fstat" (which I think is
> safe to make chatty as well---we do not want to special case ENOENT
> in open_packed_git(), so "cannot open because it is not there" is an
> error).
"chatty" means the code that regularly gives information about its
internal operations. Did I understand it right because I'm actually
firstly know this description.
"cannot open because it is not there" is an error, but I think it will
also could be a BUG, actually I'm not very sure for clarify the
difference bwtween the use of the two, but I will look into it to dig
something out.
> And then, this "invalid" will become redundant and fuzzier message
> than what is_pack_valid() would have already given, so you can leave
> it to silently return -1 here.
Clear now.
Thanks.
next prev parent reply other threads:[~2022-07-05 9:08 UTC|newest]
Thread overview: 128+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-24 11:43 [PATCH v1 0/3] trace2 output for bitmap decision path Teng Long
2022-03-24 11:43 ` [PATCH v1 1/3] pack-bitmap.c: use "ret" in "open_midx_bitmap()" Teng Long
2022-03-24 19:11 ` Taylor Blau
2022-03-28 7:59 ` [PATCH v1 1/3] pack-bitmap.c: use "ret" in "open_midx_bitmap() Teng Long
2022-03-30 2:39 ` Taylor Blau
2022-03-24 11:44 ` [PATCH v1 2/3] pack-bitmap.c: add "break" statement in "open_pack_bitmap()" Teng Long
2022-03-24 18:40 ` Junio C Hamano
2022-03-24 19:06 ` Taylor Blau
2022-03-24 19:03 ` Taylor Blau
2022-03-29 2:49 ` Teng Long
2022-03-30 2:55 ` Taylor Blau
2022-03-30 7:32 ` Teng Long Teng Long
2022-03-30 13:17 ` Ævar Arnfjörð Bjarmason
2022-03-24 11:44 ` [PATCH v1 3/3] bitmap: add trace outputs during open "bitmap" file Teng Long
2022-03-24 18:42 ` Junio C Hamano
2022-03-24 13:22 ` [PATCH v1 0/3] trace2 output for bitmap decision path Ævar Arnfjörð Bjarmason
2022-03-29 7:38 ` Teng Long Teng Long
2022-03-29 8:54 ` Ævar Arnfjörð Bjarmason
2022-04-21 13:26 ` [PATCH v2 0/5] trace2 output for bitmap decision path Teng Long
2022-04-21 13:26 ` [PATCH v2 1/5] pack-bitmap.c: continue looping when first MIDX bitmap is found Teng Long
2022-05-11 21:31 ` Taylor Blau
2022-04-21 13:26 ` [PATCH v2 2/5] pack-bitmap.c: rename "idx_name" to "bitmap_name" Teng Long
2022-05-11 21:31 ` Taylor Blau
2022-04-21 13:26 ` [PATCH v2 3/5] pack-bitmap.c: make warnings more detailed when opening bitmap Teng Long
2022-04-21 17:25 ` Taylor Blau
2022-05-06 9:08 ` Teng Long
2022-04-21 13:26 ` [PATCH v2 4/5] bitmap: add trace2 outputs during open "bitmap" file Teng Long
2022-04-21 15:51 ` Ævar Arnfjörð Bjarmason
2022-05-06 11:27 ` Teng Long
2022-05-06 11:53 ` Teng Long
2022-04-21 16:32 ` Jeff Hostetler
2022-05-06 12:43 ` Teng Long
2022-05-10 20:47 ` Jeff Hostetler
2022-04-21 13:26 ` [PATCH v2 5/5] pack-bitmap.c: using error() instead of silently returning -1 Teng Long
2022-04-21 15:41 ` Ævar Arnfjörð Bjarmason
2022-05-06 12:55 ` Teng Long
2022-06-12 7:44 ` [PATCH v3 0/5] Teng Long
2022-06-12 7:44 ` [PATCH v3 1/5] pack-bitmap.c: continue looping when first MIDX bitmap is found Teng Long
2022-06-12 7:44 ` [PATCH v3 2/5] pack-bitmap.c: rename "idx_name" to "bitmap_name" Teng Long
2022-06-12 7:44 ` [PATCH v3 3/5] pack-bitmap.c: make warnings support i18N when opening bitmap Teng Long
2022-06-12 7:44 ` [PATCH v3 4/5] pack-bitmap.c: using error() instead of silently returning -1 Teng Long
2022-06-14 1:15 ` Taylor Blau
2022-06-20 13:17 ` Teng Long
2022-06-12 7:44 ` [PATCH v3 5/5] bitmap: add trace2 outputs during open "bitmap" file Teng Long
2022-06-13 20:59 ` Junio C Hamano
2022-06-20 13:32 ` Teng Long
2022-06-14 1:40 ` Taylor Blau
2022-06-21 6:58 ` Teng Long
2022-06-22 12:51 ` Jeff Hostetler
2022-06-23 9:38 ` Teng Long
2022-06-23 15:14 ` Jeff Hostetler
2022-06-24 8:27 ` [PATCH v3 5/5] bitmap: add trace2 outputs during open "bitmap" Teng Long
2022-06-21 13:25 ` [PATCH v3 0/5] trace2 output for bitmap decision path Teng Long
2022-06-21 13:25 ` [PATCH v3 1/5] pack-bitmap.c: continue looping when first MIDX bitmap is found Teng Long
2022-06-21 13:25 ` [PATCH v3 2/5] pack-bitmap.c: rename "idx_name" to "bitmap_name" Teng Long
2022-06-21 13:25 ` [PATCH v3 3/5] pack-bitmap.c: make warnings support i18N when opening bitmap Teng Long
2022-06-21 13:25 ` [PATCH v3 4/5] pack-bitmap.c: using error() instead of silently returning -1 Teng Long
2022-06-21 13:25 ` [PATCH v3 5/5] bitmap: add trace2 outputs during open "bitmap" file Teng Long
2022-06-22 13:04 ` Jeff Hostetler
2022-06-22 15:12 ` Junio C Hamano
2022-06-28 8:17 ` [PATCH v5 0/5] tr2: avoid to print "interesting" config repeatedly Teng Long
2022-06-28 8:17 ` [PATCH v5 1/5] pack-bitmap.c: continue looping when first MIDX bitmap is found Teng Long
2022-06-28 8:17 ` [PATCH v5 2/5] pack-bitmap.c: rename "idx_name" to "bitmap_name" Teng Long
2022-06-28 8:17 ` [PATCH v5 3/5] pack-bitmap.c: using error() instead of silently returning -1 Teng Long
2022-06-28 18:04 ` Junio C Hamano
2022-07-05 9:04 ` Teng Long [this message]
2022-07-05 18:23 ` Junio C Hamano
2022-06-28 8:17 ` [PATCH v5 4/5] pack-bitmap.c: retrieve missing i18n translations Teng Long
2022-06-28 8:58 ` Ævar Arnfjörð Bjarmason
2022-06-28 17:28 ` Eric Sunshine
2022-07-06 14:19 ` Teng Long
2022-07-06 14:06 ` Teng Long
2022-06-28 18:07 ` Junio C Hamano
2022-07-07 11:59 ` Teng Long
2022-07-07 16:45 ` Junio C Hamano
2022-07-11 11:04 ` Teng Long
2022-06-28 8:17 ` [PATCH v5 5/5] tr2: avoid to print "interesting" config repeatedly Teng Long
2022-06-28 9:13 ` Ævar Arnfjörð Bjarmason
2022-06-28 18:12 ` Junio C Hamano
2022-07-01 14:31 ` Jeff Hostetler
2022-07-11 4:11 ` Teng Long
2022-07-11 3:51 ` Teng Long
2022-07-11 12:43 ` [PATCH v6 0/7] trace2: dump scope when print "interesting" config Teng Long
2022-07-11 12:43 ` [PATCH v6 1/7] clean: fixed issues related to text output format Teng Long
2022-07-11 21:08 ` Junio C Hamano
2022-07-13 11:44 ` Teng Long
2022-07-11 12:43 ` [PATCH v6 2/7] pack-bitmap.c: mark more strings for translations Teng Long
2022-07-11 12:43 ` [PATCH v6 3/7] pack-bitmap.c: rename "idx_name" to "bitmap_name" Teng Long
2022-07-11 12:44 ` [PATCH v6 4/7] pack-bitmap.c: don't ignore ENOENT silently Teng Long
2022-07-11 14:38 ` Ævar Arnfjörð Bjarmason
2022-07-13 14:14 ` Teng Long
2022-07-11 21:22 ` Junio C Hamano
2022-07-14 15:25 ` Teng Long
2022-07-11 12:44 ` [PATCH v6 5/7] pack-bitmap.c: using error() instead of silently returning -1 Teng Long
2022-07-11 14:53 ` Ævar Arnfjörð Bjarmason
2022-07-15 2:34 ` Teng Long
2022-07-11 12:44 ` [PATCH v6 6/7] pack-bitmap.c: continue looping when first MIDX bitmap is found Teng Long
2022-07-11 12:44 ` [PATCH v6 7/7] tr2: dump names if config exist in multiple scopes Teng Long
2022-07-11 14:40 ` Ævar Arnfjörð Bjarmason
2022-07-11 19:19 ` Jeff Hostetler
2022-07-11 14:59 ` [PATCH v6 0/7] trace2: dump scope when print "interesting" config Ævar Arnfjörð Bjarmason
2022-07-18 8:36 ` Teng Long
2022-07-18 16:45 ` [PATCH v7 " Teng Long
2022-07-18 16:46 ` [PATCH v7 1/7] pack-bitmap.c: fix formatting of error messages Teng Long
2022-07-18 16:46 ` [PATCH v7 2/7] pack-bitmap.c: mark more strings for translations Teng Long
2022-07-18 16:46 ` [PATCH v7 3/7] pack-bitmap.c: rename "idx_name" to "bitmap_name" Teng Long
2022-07-18 16:46 ` [PATCH v7 4/7] pack-bitmap.c: do not ignore error when opening a bitmap file Teng Long
2022-07-18 16:46 ` [PATCH v7 5/7] pack-bitmap.c: using error() instead of silently returning -1 Teng Long
2022-07-18 16:46 ` [PATCH v7 6/7] pack-bitmap.c: continue looping when first MIDX bitmap is found Teng Long
2022-07-18 16:46 ` [PATCH v7 7/7] tr2: dump names if config exist in multiple scopes Teng Long
2022-07-18 20:13 ` Jeff Hostetler
2022-07-19 7:40 ` tenglong.tl
2022-07-19 21:03 ` Junio C Hamano
2022-07-20 12:48 ` tenglong.tl
2022-07-18 18:57 ` [PATCH v7 0/7] trace2: dump scope when print "interesting" config Junio C Hamano
2022-07-18 19:07 ` Ævar Arnfjörð Bjarmason
2022-07-19 11:26 ` tenglong.tl
2022-07-19 11:42 ` Ævar Arnfjörð Bjarmason
2022-07-19 12:34 ` tenglong.tl
2022-07-21 9:05 ` [PATCH v8 0/6] pack-bitmap.c: optimize error messages tenglong.tl
2022-07-21 9:05 ` [PATCH v8 1/6] pack-bitmap.c: fix formatting of " tenglong.tl
2022-07-21 9:05 ` [PATCH v8 2/6] pack-bitmap.c: mark more strings for translations tenglong.tl
2022-07-21 9:05 ` [PATCH v8 3/6] pack-bitmap.c: rename "idx_name" to "bitmap_name" tenglong.tl
2022-07-21 9:05 ` [PATCH v8 4/6] pack-bitmap.c: do not ignore error when opening a bitmap file tenglong.tl
2022-07-21 9:05 ` [PATCH v8 5/6] pack-bitmap.c: using error() instead of silently returning -1 tenglong.tl
2022-07-21 9:05 ` [PATCH v8 6/6] pack-bitmap.c: continue looping when first MIDX bitmap is found tenglong.tl
2022-07-21 23:01 ` [PATCH v8 0/6] pack-bitmap.c: optimize error messages Junio C Hamano
2022-07-22 6:17 ` tenglong.tl
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