From: Junio C Hamano <gitster@pobox.com>
To: "Elijah Newren via GitGitGadget" <gitgitgadget@gmail.com>
Cc: git@vger.kernel.org, Derrick Stolee <derrickstolee@github.com>,
Elijah Newren <newren@gmail.com>
Subject: Re: [PATCH v2 1/2] rebase: remove completely useless -C option
Date: Fri, 20 Jan 2023 04:05:22 -0800 [thread overview]
Message-ID: <xmqq5yd1za0t.fsf@gitster.g> (raw)
In-Reply-To: <a0f8f5fac1c3f79cd46b943e95636728677dffef.1674190573.git.gitgitgadget@gmail.com> (Elijah Newren via GitGitGadget's message of "Fri, 20 Jan 2023 04:56:12 +0000")
"Elijah Newren via GitGitGadget" <gitgitgadget@gmail.com> writes:
> From: Elijah Newren <newren@gmail.com>
>
> The `-C` option to rebase was introduced with 67dad687ad ("add -C[NUM]
> to git-am", 2007-02-08).
> ...
> As per the git-apply documentation for the `-C` option:
> Ensure at least <n> lines of surrounding context match...When fewer
> lines of surrounding context exist they all must match.
>
> The fact that format-patch was not passed a -U option to increase the
> number of context lines meant that there would still only be 3 lines of
> context to match on.
I am afraid that this is only less than half true. Isn't the
intended use of -C<num> similar to how "patch --fuzz" is used?
That is, even when a patch does not cleanly apply with full context
in the incoming diff, by requiring *smaller* number of lines to
match, the diff *could* be forced to apply with reduced precision?
My read of "even if context has changed a bit" in the log of that
commit is exactly that. And for such a use case (which I think is
the primary use case for the feature), you do not need to futz with
the patch generation side at all.
commit 67dad687ad15d26d8e26f4d27874af0bc0965ce2
Author: Michael S. Tsirkin <mst@kernel.org>
Date: Thu Feb 8 15:57:08 2007 +0200
add -C[NUM] to git-am
Add -C[NUM] to git-am and git-rebase so that patches can be applied even
if context has changed a bit.
Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: Junio C Hamano <junkio@cox.net>
next prev parent reply other threads:[~2023-01-20 12:05 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-19 5:36 [PATCH] rebase: mark --update-refs as requiring the merge backend Elijah Newren via GitGitGadget
2023-01-19 21:47 ` Derrick Stolee
2023-01-20 1:54 ` Elijah Newren
2023-01-20 15:27 ` Junio C Hamano
2023-01-20 16:47 ` Elijah Newren
2023-01-20 4:56 ` [PATCH v2 0/2] " Elijah Newren via GitGitGadget
2023-01-20 4:56 ` [PATCH v2 1/2] rebase: remove completely useless -C option Elijah Newren via GitGitGadget
2023-01-20 5:40 ` Eric Sunshine
2023-01-20 6:42 ` Elijah Newren
2023-01-20 9:55 ` Martin Ågren
2023-01-20 15:32 ` Elijah Newren
2023-01-20 12:05 ` Junio C Hamano [this message]
2023-01-20 15:31 ` Elijah Newren
2023-01-20 16:15 ` Junio C Hamano
2023-01-21 4:52 ` Elijah Newren
2023-01-22 0:02 ` Junio C Hamano
2023-01-20 4:56 ` [PATCH v2 2/2] rebase: mark --update-refs as requiring the merge backend Elijah Newren via GitGitGadget
2023-01-20 16:46 ` Phillip Wood
2023-01-21 1:34 ` Elijah Newren
2023-01-21 1:55 ` [PATCH v3 0/7] rebase: fix several code/testing/documentation issues around flag incompatibilities Elijah Newren via GitGitGadget
2023-01-21 1:55 ` [PATCH v3 1/7] rebase: mark --update-refs as requiring the merge backend Elijah Newren via GitGitGadget
2023-01-21 1:55 ` [PATCH v3 2/7] rebase: flag --apply and --merge as incompatible Elijah Newren via GitGitGadget
2023-01-21 1:55 ` [PATCH v3 3/7] rebase: remove --allow-empty-message from incompatible opts Elijah Newren via GitGitGadget
2023-01-21 15:09 ` Phillip Wood
2023-01-21 1:55 ` [PATCH v3 4/7] rebase: fix docs about incompatibilities with --root Elijah Newren via GitGitGadget
2023-01-21 1:55 ` [PATCH v3 5/7] rebase: add coverage of other incompatible options Elijah Newren via GitGitGadget
2023-01-21 15:20 ` Phillip Wood
2023-01-21 19:25 ` Phillip Wood
2023-01-22 5:11 ` Elijah Newren
2023-01-21 1:55 ` [PATCH v3 6/7] rebase: clarify the OPT_CMDMODE incompatibilities Elijah Newren via GitGitGadget
2023-01-21 1:55 ` [PATCH v3 7/7] rebase: fix formatting of rebase --reapply-cherry-picks option in docs Elijah Newren via GitGitGadget
2023-01-21 15:21 ` Phillip Wood
2023-01-22 6:12 ` [PATCH v4 0/9] rebase: fix several code/testing/documentation issues around flag incompatibilities Elijah Newren via GitGitGadget
2023-01-22 6:12 ` [PATCH v4 1/9] rebase: mark --update-refs as requiring the merge backend Elijah Newren via GitGitGadget
2023-01-22 6:12 ` [PATCH v4 2/9] rebase: flag --apply and --merge as incompatible Elijah Newren via GitGitGadget
2023-01-22 6:12 ` [PATCH v4 3/9] rebase: remove --allow-empty-message from incompatible opts Elijah Newren via GitGitGadget
2023-01-22 6:12 ` [PATCH v4 4/9] rebase: fix docs about incompatibilities with --root Elijah Newren via GitGitGadget
2023-01-22 6:12 ` [PATCH v4 5/9] rebase: add coverage of other incompatible options Elijah Newren via GitGitGadget
2023-01-23 20:08 ` Phillip Wood
2023-01-24 2:36 ` Elijah Newren
2023-01-24 10:27 ` Phillip Wood
2023-01-24 13:16 ` Phillip Wood
2023-01-24 14:48 ` Junio C Hamano
2023-01-24 15:41 ` Elijah Newren
2023-01-24 16:48 ` Phillip Wood
2023-01-24 17:12 ` Elijah Newren
2023-01-24 19:21 ` Phillip Wood
2023-01-22 6:12 ` [PATCH v4 6/9] rebase: clarify the OPT_CMDMODE incompatibilities Elijah Newren via GitGitGadget
2023-01-22 6:12 ` [PATCH v4 7/9] rebase: fix formatting of rebase --reapply-cherry-picks option in docs Elijah Newren via GitGitGadget
2023-01-22 6:12 ` [PATCH v4 8/9] rebase: put rebase_options initialization in single place Elijah Newren via GitGitGadget
2023-01-22 6:12 ` [PATCH v4 9/9] rebase: provide better error message for apply options vs. merge config Elijah Newren via GitGitGadget
2023-01-23 15:56 ` [PATCH v4 0/9] rebase: fix several code/testing/documentation issues around flag incompatibilities Derrick Stolee
2023-01-24 2:05 ` Elijah Newren
2023-01-25 4:03 ` [PATCH v5 00/10] " Elijah Newren via GitGitGadget
2023-01-25 4:03 ` [PATCH v5 01/10] rebase: mark --update-refs as requiring the merge backend Elijah Newren via GitGitGadget
2023-01-25 4:03 ` [PATCH v5 02/10] rebase: flag --apply and --merge as incompatible Elijah Newren via GitGitGadget
2023-01-25 4:03 ` [PATCH v5 03/10] rebase: remove --allow-empty-message from incompatible opts Elijah Newren via GitGitGadget
2023-01-25 4:03 ` [PATCH v5 04/10] rebase: fix docs about incompatibilities with --root Elijah Newren via GitGitGadget
2023-01-25 4:03 ` [PATCH v5 05/10] rebase: fix incompatiblity checks for --[no-]reapply-cherry-picks Elijah Newren via GitGitGadget
2023-01-25 14:14 ` Phillip Wood
2023-01-25 4:03 ` [PATCH v5 06/10] rebase: add coverage of other incompatible options Elijah Newren via GitGitGadget
2023-01-25 4:03 ` [PATCH v5 07/10] rebase: clarify the OPT_CMDMODE incompatibilities Elijah Newren via GitGitGadget
2023-01-25 4:03 ` [PATCH v5 08/10] rebase: fix formatting of rebase --reapply-cherry-picks option in docs Elijah Newren via GitGitGadget
2023-01-25 4:03 ` [PATCH v5 09/10] rebase: put rebase_options initialization in single place Elijah Newren via GitGitGadget
2023-01-25 4:03 ` [PATCH v5 10/10] rebase: provide better error message for apply options vs. merge config Elijah Newren via GitGitGadget
2023-01-25 14:17 ` [PATCH v5 00/10] rebase: fix several code/testing/documentation issues around flag incompatibilities Phillip Wood
2023-01-25 16:39 ` Junio C Hamano
2023-01-25 16:48 ` Elijah Newren
2023-02-02 10:29 ` rebase --merge vs --whitespace=fix, was " Johannes Schindelin
2023-02-02 23:48 ` Elijah Newren
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