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From: Junio C Hamano <gitster@pobox.com>
To: Felipe Contreras <felipe.contreras@gmail.com>
Cc: git@vger.kernel.org, David Aguilar <davvid@gmail.com>,
	Johannes Sixt <j6t@kdbg.org>, Seth House <seth@eseth.com>
Subject: Re: [PATCH v5 1/1] mergetool: add automerge configuration
Date: Wed, 23 Dec 2020 05:34:24 -0800	[thread overview]
Message-ID: <xmqqblekabof.fsf@gitster.c.googlers.com> (raw)
In-Reply-To: <20201223045358.100754-2-felipe.contreras@gmail.com>

Felipe Contreras <felipe.contreras@gmail.com> writes:

> +auto_merge () {
> +	git merge-file --diff3 --marker-size=7 -q -p "$LOCAL" "$BASE" "$REMOTE" >"$DIFF3"
> +	if test -s "$DIFF3"
> +	then

We do not want to ignore the exit status from the command.  IOW, I
think the above wants to be rather

	if git merge-file ... >"$DIFF3" &&
	   test -s "$DIFF3"
	then
		...

to catch a merge-file that writes halfway and then crashes (doing
the same check in different ways are probably possible, of course)

> +		sed -e '/^<<<<<<< /,/^||||||| /d' -e '/^=======\r\?$/,/^>>>>>>> /d' "$DIFF3" >"$BASE"

Does everybody's sed take "\?" and interprets it as zero-or-one?
POSIX uses BRE and it doesn't like \? as far as I recall, and "-E"
to force ERE is a GNUism.

> +		sed -e '/^||||||| /,/^>>>>>>> /d' -e '/^<<<<<<< /d' "$DIFF3" >"$LOCAL"
> +		sed -e '/^<<<<<<< /,/^=======\r\?$/d' -e '/^>>>>>>> /d' "$DIFF3" >"$REMOTE"

I'd feel safer if these resulting $BASE, $LOCAL and $REMOTE are
validated to be conflict-marker free (i.e. '^\([<|=>]\)\1\1\1\1\1\1'
does not appear) to make sure there was no funny virtual ancestor
that records a conflicted recursive merge result confused our logic.

When we see an unfortunate sign that it happened, we can revert the
automerge and let the tool handle the original input.

> +	fi
> +	rm -- "$DIFF3"
> +}
> +

"$DIFF3" is always created (unless shell redirection into it fails),
so "rm --" would be fine in practice, I guess, but "rm -f --" would
not hurt.

> +	DIFF3="$MERGETOOL_TMPDIR/${BASE}_DIFF3_$$$ext"

$MERGETOOL_TMPDIR is either "mktemp -d -t "git-mergetool-XXXXXX" or
".".  Also, we liberally pass "$DIFF3" to "sed" as an argument and
assume that the command would take it as a filename and not an
option.

For the above reason, "rm --", while it is not wrong per-se, can be
just a simple "rm", as there is no funny leading letters in "$DIFF3"
that requires disambiguation.


  reply	other threads:[~2020-12-23 13:35 UTC|newest]

Thread overview: 80+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-23  4:53 [PATCH v5 0/1] mergetool: remove unconflicted lines Felipe Contreras
2020-12-23  4:53 ` [PATCH v5 1/1] mergetool: add automerge configuration Felipe Contreras
2020-12-23 13:34   ` Junio C Hamano [this message]
2020-12-23 14:23     ` Felipe Contreras
2020-12-23 20:21       ` Junio C Hamano
2020-12-24  0:14         ` Felipe Contreras
2020-12-24  0:32           ` Junio C Hamano
2020-12-24  1:36             ` Felipe Contreras
2020-12-24  6:17               ` Junio C Hamano
2020-12-24 15:59                 ` Felipe Contreras
2020-12-24 22:32                   ` Junio C Hamano
2020-12-27 18:01                     ` Felipe Contreras
2020-12-24  9:24 ` [PATCH v5 0/1] mergetool: remove unconflicted lines Junio C Hamano
2020-12-24 16:16   ` Felipe Contreras
2020-12-30  5:47   ` Johannes Schindelin
2020-12-30 22:33     ` Felipe Contreras
2020-12-27 20:58 ` [PATCH v6 0/1] mergetool: add automerge configuration Seth House
2020-12-27 20:58   ` [PATCH v6 1/2] " Seth House
2020-12-27 22:06     ` Junio C Hamano
2020-12-27 22:29       ` Seth House
2020-12-27 22:59         ` Junio C Hamano
2020-12-27 20:58   ` [PATCH v6 2/2] mergetool: Add per-tool support for the autoMerge flag Seth House
2020-12-27 22:31     ` Junio C Hamano
2020-12-28  0:41   ` [PATCH v7 0/2] mergetool: add automerge configuration Seth House
2020-12-28  0:41     ` [PATCH v7 1/2] " Seth House
2020-12-28  0:41     ` [PATCH v7 2/2] mergetool: Add per-tool support for the autoMerge flag Seth House
2020-12-28  1:18       ` Felipe Contreras
2020-12-28  4:54     ` [PATCH v8 0/4] mergetool: add automerge configuration Seth House
2020-12-28  4:54       ` [PATCH v8 1/4] " Seth House
2020-12-28 11:30         ` Johannes Sixt
2020-12-28  4:54       ` [PATCH v8 2/4] mergetool: Add per-tool support for the autoMerge flag Seth House
2020-12-28 13:09         ` Junio C Hamano
2020-12-28  4:54       ` [PATCH v8 3/4] mergetool: Break setup_tool out into separate initialization function Seth House
2020-12-28 11:48         ` Johannes Sixt
2020-12-28  4:54       ` [PATCH v8 4/4] mergetool: Add automerge_enabled tool-specific override function Seth House
2020-12-28 11:57         ` Johannes Sixt
2020-12-28 13:19         ` Junio C Hamano
2020-12-28 19:29       ` [PATCH v9 0/5] mergetool: add automerge configuration Seth House
2020-12-28 19:29         ` [PATCH v9 1/5] " Seth House
2020-12-28 19:29         ` [PATCH v9 2/5] mergetool: alphabetize the mergetool config docs Seth House
2020-12-28 19:29         ` [PATCH v9 3/5] mergetool: add per-tool support for the autoMerge flag Seth House
2020-12-28 19:29         ` [PATCH v9 4/5] mergetool: break setup_tool out into separate initialization function Seth House
2020-12-29  8:50           ` Johannes Sixt
2020-12-29 17:23             ` Seth House
2020-12-28 19:29         ` [PATCH v9 5/5] mergetool: add automerge_enabled tool-specific override function Seth House
2020-12-29  2:01           ` Felipe Contreras
2021-01-06  5:55           ` Junio C Hamano
2021-01-07  3:58             ` Seth House
2021-01-07  6:38               ` Junio C Hamano
2021-01-07  9:27                 ` Seth House
2021-01-07 21:26                   ` Junio C Hamano
2021-01-08 15:04                     ` Johannes Schindelin
2021-01-30  5:46         ` [PATCH v10 0/3] mergetool: add hideResolved configuration (was automerge) Seth House
2021-01-30  5:46           ` [PATCH v10 1/3] mergetool: add hideResolved configuration Seth House
2021-01-30  8:08             ` Junio C Hamano
2021-01-30  5:46           ` [PATCH v10 2/3] mergetool: break setup_tool out into separate initialization function Seth House
2021-01-30  5:46           ` [PATCH v10 3/3] mergetool: add per-tool support and overrides for the hideResolved flag Seth House
2021-01-30  8:08             ` Junio C Hamano
2021-02-09 20:07           ` [PATCH v11 0/3] mergetool: add hideResolved configuration (was automerge) Seth House
2021-02-09 20:07             ` [PATCH v11 1/3] mergetool: add hideResolved configuration Seth House
2021-03-09  2:29               ` [PATCH] mergetool: do not enable hideResolved by default Jonathan Nieder
2021-03-09  5:42                 ` Seth House
2021-03-10  1:23                   ` Jonathan Nieder
2021-03-10  8:06                 ` Junio C Hamano
2021-03-11  1:57                   ` Junio C Hamano
2021-03-12 23:12                     ` Junio C Hamano
2021-03-12 23:29                       ` Jonathan Nieder
2021-03-12 23:36                         ` Junio C Hamano
2021-03-13  8:36                           ` [PATCH v2 0/2] " Jonathan Nieder
2021-03-13  8:38                             ` [PATCH 1/2] " Jonathan Nieder
2021-03-13  8:41                             ` [PATCH 2/2] doc: describe mergetool configuration in git-mergetool(1) Jonathan Nieder
2021-03-13 23:34                               ` Junio C Hamano
2021-03-13 23:37                               ` Junio C Hamano
2021-02-09 20:07             ` [PATCH v11 2/3] mergetool: break setup_tool out into separate initialization function Seth House
2021-02-09 20:07             ` [PATCH v11 3/3] mergetool: add per-tool support and overrides for the hideResolved flag Seth House
2021-02-09 22:11             ` [PATCH v11 0/3] mergetool: add hideResolved configuration (was automerge) Junio C Hamano
2021-02-09 23:27               ` Seth House
2020-12-28 10:29     ` [PATCH v7 0/2] mergetool: add automerge configuration Junio C Hamano
2020-12-28 14:40       ` Felipe Contreras
2020-12-28  1:02   ` [PATCH v6 0/1] " Felipe Contreras

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