GNU bug report logs - #66211
30.0.50; C-x v v in vc-diff does not work with lesser versionf of patch

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From: Dmitry Gutov <dmitry <at> gutov.dev>
To: Eli Zaretskii <eliz <at> gnu.org>, "Alfred M. Szmidt" <ams <at> gnu.org>
Cc: 66211 <at> debbugs.gnu.org
Subject: bug#66211: 30.0.50; C-x v v in vc-diff does not work with lesser versionf of patch
Date: Fri, 29 Sep 2023 13:22:39 +0300

On 29/09/2023 10:05, Eli Zaretskii wrote:
>> From: "Alfred M. Szmidt"<ams <at> gnu.org>
>> Date: Tue, 26 Sep 2023 08:17:27 -0400
>>
>>
>> The C-x v v command in a*vc-diff*  buffer does not work if you have a
>> lesser version of patch, e.g., the one on OpenBSD:
>>
>> user-error: Patch failed: patch: unknown option -- no-backup-if-mismatch
>> usage: patch [-bCcEeflNnRstuv] [-B backup-prefix] [-D symbol] [-d directory]
>>               [-F max-fuzz] [-i patchfile] [-o out-file] [-p strip-count]
>>               [-r rej-name] [-V t | nil | never] [-x number] [-z backup-ext]
>>               [--posix] [origfile [patchfile]]
>>         patch <patchfile
> I don't understand: does "git apply" invoke Patch?  AFAICT, "C-x v v"
> in a*vc-diff*  buffer runs "git apply FILE", where FILE is a temporary
> patch file created from the diffs to be applied.  What am I missing?

vc-default-checkin-patch calls 'patch'. It's for other backends.

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