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From: Phillip Wood <phillip.wood123@gmail.com>
To: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Cc: Teng Long <dyroneteng@gmail.com>,
	git@vger.kernel.org, --cc=avarab@gmail.com,
	tenglong.tl@alibaba-inc.com
Subject: Re: [RFC PATCH 2/2] notes.c: fixed tip when target and append note are both empty
Date: Sat, 15 Oct 2022 20:40:52 +0100	[thread overview]
Message-ID: <b5e97527-433c-53fe-356a-e20ab3e087d2@dunelm.org.uk> (raw)
In-Reply-To: <221013.86sfjsknlw.gmgdl@evledraar.gmail.com>

Hi Ævar

On 13/10/2022 11:23, Ævar Arnfjörð Bjarmason wrote:
> 
> On Thu, Oct 13 2022, Phillip Wood wrote:
>>>> diff --git a/builtin/notes.c b/builtin/notes.c
>>>> index 1ca0476a27..cc1e3aa2b6 100644
>>>> --- a/builtin/notes.c
>>>> +++ b/builtin/notes.c
>>>> @@ -567,9 +567,10 @@ static int append_edit(int argc, const char **argv, const char *prefix)
>>>>    	struct notes_tree *t;
>>>>    	struct object_id object, new_note;
>>>>    	const struct object_id *note;
>>>> -	char *logmsg;
>>>> +	char *logmsg = NULL;
>>> Hrm, interesting that (at least my) gcc doesn't catch if we don't
>>> NULL-initialize this, but -fanalyzer does (usually it's not needed for
>>> such trivial cases0. Anyawy...
>>
>> I don't think its written to if we take the 'else if' branch added by
>> this patch so we need to initialize it for the free() at the end.
> 
> Yes, sorry about not being clear. It *does* need to be uninitialized, I
> was just narrating my surprise at this not being a case where my
> compiler caught it when I was locally testing this.

Ah I think I slightly misunderstood your comment - I agree it is 
surprising that the compiler didn't catch that.

> 	@@ -638,21 +635,16 @@ static int append_edit(int argc, const char **argv, const char *prefix)
> 	 			BUG("combine_notes_overwrite failed");
> 	 		logmsg = xstrfmt("Notes added by 'git notes %s'", argv[0]);
> 	 		commit_notes(the_repository, t, logmsg);
> 	-	} else if (!cp.buf.len) {
> 	+	} else if (!d.buf.len) {
> 	 		fprintf(stderr,
> 	 			_("Both original and appended notes are empty in %s, do nothing\n"),
> 	 			oid_to_hex(&object));
> 	 	} else {
> 	-		fprintf(stderr, _("Removing note for object %s\n"),
> 	-			oid_to_hex(&object));
> 	-		remove_note(t, object.hash);
> 	-		logmsg = xstrfmt("Notes removed by 'git notes %s'", argv[0]);
> 	-		commit_notes(the_repository, t, logmsg);
> 	+		BUG("this is not reachable by any test now");
> 	 	}
> 	
> This 2/2 makes that "else" test-unreachable, so whatever else we do here
> we should start by making sure that by adding the "else if" we still
> have test coverage for the "else".

Oh so we can just use d.buf.len directly - nicely spotted and kudos for 
checking the test coverage. Looking at the existing tests they are 
checking if an empty note is removed which suggests this patch is 
failing to distinguish between an existing empty note and no note. I 
think we probably need to be doing "else if (note && d.buf.len)" but 
I've not looked very closely.

Best Wishes

Phillip


  reply	other threads:[~2022-10-15 19:40 UTC|newest]

Thread overview: 186+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-10-13  5:56 [RFC PATCH 0/2] notes.c: introduce "--no-blankline" option Teng Long
2022-10-13  5:56 ` [RFC PATCH 1/2] " Teng Long
2022-10-13  6:06   ` Junio C Hamano
2022-10-17 13:19     ` Teng Long
2022-10-13  9:31   ` Ævar Arnfjörð Bjarmason
2022-10-17 13:33     ` Teng Long
2022-10-13  5:56 ` [RFC PATCH 2/2] notes.c: fixed tip when target and append note are both empty Teng Long
2022-10-13  9:36   ` Ævar Arnfjörð Bjarmason
2022-10-13 10:10     ` Phillip Wood
2022-10-13 10:23       ` Ævar Arnfjörð Bjarmason
2022-10-15 19:40         ` Phillip Wood [this message]
2022-10-18  3:25       ` Teng Long
2022-10-18  8:08       ` Teng Long
2022-10-18  3:11     ` Teng Long
2022-10-18  9:23       ` Ævar Arnfjörð Bjarmason
2022-11-07 13:57 ` [PATCH v2 0/3] notes.c: introduce "--blank-line" option Teng Long
2022-11-07 13:57   ` [PATCH v2 1/3] " Teng Long
2022-11-07 14:45     ` Ævar Arnfjörð Bjarmason
2022-11-07 15:45       ` Eric Sunshine
2022-11-07 17:22         ` Ævar Arnfjörð Bjarmason
2022-11-07 21:46           ` Taylor Blau
2022-11-07 22:36             ` Ævar Arnfjörð Bjarmason
2022-11-08  0:32               ` Taylor Blau
2022-11-08  3:45       ` Teng Long
2022-11-08 13:06       ` Teng Long
2022-11-08 13:22         ` Ævar Arnfjörð Bjarmason
2022-11-09  6:35           ` Teng Long
2022-11-07 15:06     ` Ævar Arnfjörð Bjarmason
2022-11-08  6:32       ` Teng Long
2022-11-07 21:47     ` Taylor Blau
2022-11-08  7:36       ` Teng Long
2022-11-07 13:57   ` [PATCH v2 2/3] notes.c: fixed tip when target and append note are both empty Teng Long
2022-11-07 14:40     ` Ævar Arnfjörð Bjarmason
2022-11-07 21:51       ` Taylor Blau
2022-11-07 22:33         ` Ævar Arnfjörð Bjarmason
2022-11-07 22:45           ` Taylor Blau
2022-11-08  8:55           ` Teng Long
2022-11-07 13:57   ` [PATCH v2 3/3] notes.c: drop unreachable code in "append_edit()" Teng Long
2022-11-07 14:41     ` Ævar Arnfjörð Bjarmason
2022-11-07 14:57   ` [PATCH v2 0/3] notes.c: introduce "--blank-line" option Ævar Arnfjörð Bjarmason
2022-11-09  7:05     ` Teng Long
2022-11-09  7:06     ` Teng Long
2022-11-09  9:06   ` [PATCH v3 0/5] notes.c: introduce "--no-blank-line" option Teng Long
2022-11-09  9:06     ` [PATCH v3 1/5] notes.c: cleanup 'strbuf_grow' call in 'append_edit' Teng Long
2022-11-09  9:06     ` [PATCH v3 2/5] notes.c: cleanup for "designated init" and "char ptr init" Teng Long
2022-11-09  9:06     ` [PATCH v3 3/5] notes.c: drop unreachable code in 'append_edit()' Teng Long
2022-11-09  9:06     ` [PATCH v3 4/5] notes.c: provide tips when target and append note are both empty Teng Long
2022-11-09  9:06     ` [PATCH v3 5/5] notes.c: introduce "--no-blank-line" option Teng Long
2022-11-28 14:20     ` [PATCH v3 0/5] " Teng Long
2022-11-29  1:10       ` Junio C Hamano
2022-11-29 22:53         ` Taylor Blau
2022-11-29 12:57     ` Teng Long
2022-11-29 13:19       ` Junio C Hamano
2022-12-15 12:48         ` Teng Long
2022-12-19  3:03           ` Eric Sunshine
2022-12-21  9:16             ` Teng Long
2022-12-21 11:35               ` Junio C Hamano
2022-12-22  9:30             ` Teng Long
2022-12-23  1:36               ` Eric Sunshine
2023-01-12  2:48     ` [PATCH v4 0/5] notes.c: introduce "--separator" optio Teng Long
2023-01-12  2:48       ` [PATCH v4 1/5] notes.c: cleanup 'strbuf_grow' call in 'append_edit' Teng Long
2023-01-15  4:53         ` Eric Sunshine
2023-01-28 11:22           ` Teng Long
2023-01-12  2:48       ` [PATCH v4 2/5] notes.c: cleanup for "designated init" and "char ptr init" Teng Long
2023-01-12  9:51         ` Ævar Arnfjörð Bjarmason
2023-01-28 11:33           ` Teng Long
2023-01-12  2:48       ` [PATCH v4 3/5] notes.c: drop unreachable code in 'append_edit()' Teng Long
2023-01-15 20:59         ` Eric Sunshine
2023-01-15 21:10           ` Eric Sunshine
2023-01-28 11:50           ` Teng Long
2023-01-30  5:38             ` Eric Sunshine
2023-02-01  8:08               ` Teng Long
2023-01-12  2:48       ` [PATCH v4 4/5] notes.c: provide tips when target and append note are both empty Teng Long
2023-01-12  9:52         ` Ævar Arnfjörð Bjarmason
2023-01-15 21:28         ` Eric Sunshine
2023-01-12  2:48       ` [PATCH v4 5/5] notes.c: introduce "--separator" option Teng Long
2023-01-12  9:53         ` Ævar Arnfjörð Bjarmason
2023-01-15 22:04           ` Eric Sunshine
2023-01-15 22:15         ` Eric Sunshine
2023-02-16 13:05       ` [PATCH v5 0/3] " Teng Long
2023-02-16 13:05         ` [PATCH v5 1/3] notes.c: cleanup 'strbuf_grow' call in 'append_edit' Teng Long
2023-02-16 18:39           ` Junio C Hamano
2023-02-20  3:34             ` Teng Long
2023-02-16 13:05         ` [PATCH v5 2/3] notes.c: cleanup for "designated init" Teng Long
2023-02-16 18:39           ` Junio C Hamano
2023-02-16 13:05         ` [PATCH v5 3/3] notes.c: introduce "--separator" option Teng Long
2023-02-16 23:22           ` Junio C Hamano
2023-02-20 14:00             ` Teng Long
2023-02-21 21:31               ` Junio C Hamano
2023-02-22  8:17                 ` Teng Long
2023-02-22 23:15                   ` Junio C Hamano
2023-02-23  7:29         ` [PATCH v6 0/3] " Teng Long
2023-02-23  7:29           ` [PATCH v6 1/3] notes.c: cleanup 'strbuf_grow' call in 'append_edit' Teng Long
2023-02-23  7:29           ` [PATCH v6 2/3] notes.c: cleanup for "designated init" Teng Long
2023-02-23  7:29           ` [PATCH v6 3/3] notes.c: introduce '--separator=<paragraph-break>' option Teng Long
2023-02-23 18:21             ` Junio C Hamano
2023-02-28 14:11               ` Teng Long
2023-02-25 21:30             ` Junio C Hamano
2023-02-28 14:14               ` Teng Long
2023-03-27 13:13           ` [PATCH v6 0/3] notes.c: introduce "--separator" option Teng Long
2023-03-28 14:28           ` [PATCH v7 0/4] " Teng Long
2023-03-28 14:28             ` [PATCH v7 1/4] notes.c: cleanup 'strbuf_grow' call in 'append_edit' Teng Long
2023-03-28 14:28             ` [PATCH v7 2/4] notes.c: cleanup for "designated init" Teng Long
2023-03-29 22:17               ` Junio C Hamano
2023-03-28 14:28             ` [PATCH v7 3/4] notes.c: introduce '--separator=<paragraph-break>' option Teng Long
2023-03-28 15:37               ` Junio C Hamano
2023-03-29 14:15                 ` Teng Long
2023-03-29 21:48                   ` Junio C Hamano
2023-04-13  9:36                     ` Teng Long
2023-03-28 14:28             ` [PATCH v7 4/4] notes.c: don't do stripespace when parse file arg Teng Long
2023-03-28 15:54               ` Junio C Hamano
2023-03-29 12:06                 ` Teng Long
2023-03-29 16:21                   ` Junio C Hamano
2023-04-25 13:34             ` [PATCH 0/6] notes.c: introduce "--separator" option Teng Long
2023-04-25 13:34               ` [PATCH v8 1/6] notes.c: cleanup 'strbuf_grow' call in 'append_edit' Teng Long
2023-04-25 13:34               ` [PATCH v8 2/6] notes.c: use designated initializers for clarity Teng Long
2023-04-25 13:34               ` [PATCH v8 3/6] t3321: add test cases about the notes stripspace behavior Teng Long
2023-04-25 16:25                 ` Junio C Hamano
2023-04-27  3:47                   ` Teng Long
2023-04-25 13:34               ` [PATCH v8 4/6] notes.c: introduce '--separator=<paragraph-break>' option Teng Long
2023-04-25 17:34                 ` Junio C Hamano
2023-04-27  7:21                   ` Teng Long
2023-04-27 18:21                     ` Junio C Hamano
2023-04-25 17:35                 ` Junio C Hamano
2023-04-25 13:34               ` [PATCH v8 5/6] notes.c: append separator instead of insert by pos Teng Long
2023-04-25 17:47                 ` Junio C Hamano
2023-04-27  7:51                   ` Teng Long
2023-04-25 13:34               ` [PATCH v8 6/6] notes.c: introduce "--[no-]stripspace" option Teng Long
2023-04-25 17:49                 ` Junio C Hamano
2023-04-28  7:40                   ` Teng Long
2023-04-28 18:21                     ` Junio C Hamano
2023-04-28  9:23               ` [PATCH v9 0/6] notes.c: introduce "--separator" option Teng Long
2023-04-28  9:23                 ` [PATCH v9 1/6] notes.c: cleanup 'strbuf_grow' call in 'append_edit' Teng Long
2023-04-28  9:23                 ` [PATCH v9 2/6] notes.c: use designated initializers for clarity Teng Long
2023-04-28  9:23                 ` [PATCH v9 3/6] t3321: add test cases about the notes stripspace behavior Teng Long
2023-04-28  9:23                 ` [PATCH v9 4/6] notes.c: introduce '--separator=<paragraph-break>' option Teng Long
2023-04-28 20:44                   ` Junio C Hamano
2023-05-06  9:12                     ` Teng Long
2023-05-06  9:22                       ` Teng Long
2023-05-10 19:19                   ` Kristoffer Haugsbakk
2023-05-12  4:07                     ` Teng Long
2023-05-12  7:29                       ` Kristoffer Haugsbakk
2023-05-16 17:00                       ` Junio C Hamano
2023-05-17  3:58                         ` Teng Long
2023-05-17 15:32                           ` Junio C Hamano
2023-06-14  1:02                   ` Junio C Hamano
2023-06-14  1:10                     ` [PATCH] notes: do not access before the beginning of an array Junio C Hamano
2023-06-14  1:41                     ` [PATCH v9 4/6] notes.c: introduce '--separator=<paragraph-break>' option Eric Sunshine
2023-06-14  2:07                       ` Junio C Hamano
2023-06-15  7:13                         ` Jeff King
2023-06-15 19:15                           ` Junio C Hamano
2023-06-19  6:08                             ` Teng Long
2023-06-20 20:36                               ` Junio C Hamano
2023-06-21  2:50                                 ` Teng Long
2023-04-28  9:23                 ` [PATCH v9 5/6] notes.c: append separator instead of insert by pos Teng Long
2023-04-28  9:23                 ` [PATCH v9 6/6] notes.c: introduce "--[no-]stripspace" option Teng Long
2023-04-28 20:46                 ` [PATCH v9 0/6] notes.c: introduce "--separator" option Junio C Hamano
2023-05-01 22:29                 ` Junio C Hamano
2023-05-18 12:02                 ` [PATCH v10 " Teng Long
2023-05-18 12:02                   ` [PATCH v10 1/6] notes.c: cleanup 'strbuf_grow' call in 'append_edit' Teng Long
2023-05-18 12:02                   ` [PATCH v10 2/6] notes.c: use designated initializers for clarity Teng Long
2023-05-18 12:02                   ` [PATCH v10 3/6] t3321: add test cases about the notes stripspace behavior Teng Long
2023-05-18 12:02                   ` [PATCH v10 4/6] notes.c: introduce '[--[no-]separator|--separator=<paragraph-break>]' option Teng Long
2023-05-18 14:34                     ` Kristoffer Haugsbakk
2023-05-20 10:41                       ` Teng Long
2023-05-20 16:12                         ` Kristoffer Haugsbakk
2023-05-19  0:54                     ` Jeff King
2023-05-27  7:17                       ` Teng Long
2023-05-27 17:19                         ` Jeff King
2023-05-29 11:48                           ` Teng Long
2023-05-18 12:02                   ` [PATCH v10 5/6] notes.c: append separator instead of insert by pos Teng Long
2023-05-18 12:02                   ` [PATCH v10 6/6] notes.c: introduce "--[no-]stripspace" option Teng Long
2023-05-18 13:56                   ` [PATCH v10 0/6] notes.c: introduce "--separator" option Kristoffer Haugsbakk
2023-05-20 10:22                     ` Teng Long
2023-05-18 15:17                   ` Junio C Hamano
2023-05-20 10:59                     ` Teng Long
2023-05-27  7:57                   ` [PATCH v11 0/7] notes.c: introduce "--separator" Teng Long
2023-05-27  7:57                     ` [PATCH v11 1/7] notes.c: cleanup 'strbuf_grow' call in 'append_edit' Teng Long
2023-05-27  7:57                     ` [PATCH v11 2/7] notes.c: use designated initializers for clarity Teng Long
2023-05-27  7:57                     ` [PATCH v11 3/7] t3321: add test cases about the notes stripspace behavior Teng Long
2023-05-27  7:57                     ` [PATCH v11 4/7] notes.c: introduce '--separator=<paragraph-break>' option Teng Long
2023-05-27  7:57                     ` [PATCH v11 5/7] notes.c: append separator instead of insert by pos Teng Long
2023-05-27  7:57                     ` [PATCH v11 6/7] notes.c: introduce "--[no-]stripspace" option Teng Long
2023-05-27  7:57                     ` [PATCH v11 7/7] notes: introduce "--no-separator" option Teng Long
2023-06-01  5:50                     ` [PATCH v11 0/7] notes.c: introduce "--separator" Junio C Hamano
2023-06-03 10:01                       ` Teng Long

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