From: Jonathan Nieder <jrnieder@gmail.com>
To: Elijah Newren via GitGitGadget <gitgitgadget@gmail.com>
Cc: git@vger.kernel.org, Johannes.Schindelin@gmx.de,
phillip.wood@dunelm.org.uk, liu.denton@gmail.com,
gitster@pobox.com, plroskin@gmail.com, alban.gruin@gmail.com,
szeder.dev@gmail.com, Elijah Newren <newren@gmail.com>
Subject: Re: [PATCH v3 15/15] rebase: change the default backend from "am" to "merge"
Date: Fri, 10 Jan 2020 15:14:36 -0800 [thread overview]
Message-ID: <20200110231436.GA24315@google.com> (raw)
In-Reply-To: <044853fd612ee8cf6928bb7c4ebb1eacaa172aa3.1577217299.git.gitgitgadget@gmail.com>
Hi,
Elijah Newren via GitGitGadget wrote:
> The am-backend drops information and thus limits what we can do:
>
> * lack of full tree information from the original commits means we
> cannot do directory rename detection and warn users that they might
> want to move some of their new files that they placed in old
> directories to prevent their becoming orphaned.[1]
> * reduction in context from only having a few lines beyond those
> changed means that when context lines are non-unique we can apply
> patches incorrectly.[2]
> * lack of access to original commits means that conflict marker
> annotation has less information available.
>
> Also, the merge/interactive backend have far more abilities, appear to
> currently have a slight performance advantage[3] and have room for more
> optimizations than the am backend[4] (and work is underway to take
> advantage of some of those possibilities).
>
> [1] https://lore.kernel.org/git/xmqqh8jeh1id.fsf@gitster-ct.c.googlers.com/
> [2] https://lore.kernel.org/git/CABPp-BGiu2nVMQY_t-rnFR5GQUz_ipyEE8oDocKeO+h+t4Mn4A@mail.gmail.com/
> [3] https://public-inbox.org/git/CABPp-BF=ev03WgODk6TMQmuNoatg2kiEe5DR__gJ0OTVqHSnfQ@mail.gmail.com/
> [4] https://lore.kernel.org/git/CABPp-BGh7yW69QwxQb13K0HM38NKmQif3A6C6UULEKYnkEJ5vA@mail.gmail.com/
>
> Signed-off-by: Elijah Newren <newren@gmail.com>
> ---
> Documentation/git-rebase.txt | 2 +-
> builtin/rebase.c | 4 ++--
> t/t5520-pull.sh | 10 ++++++----
> t/t9106-git-svn-commit-diff-clobber.sh | 3 ++-
> 4 files changed, 11 insertions(+), 8 deletions(-)
Thanks for writing this. We finally rolled this out to our internal
population at $DAYJOB and ran into a couple of issues:
1. "git rebase --am" does not invoke the post-commit hook, but "git
rebase --merge" does. Is this behavior change intended?
Noticed because jiri[1] installs a post-commit hook that warns
about commits on detached HEAD, so this change makes rebases more
noisy in repositories that were set up using jiri.
2. GIT_REFLOG_ACTION contains "rebase -i" even though the rebase is
not interactive.
3. In circumstances I haven't pinned down yet, we get the error
message "invalid date format: @@2592000 +0000":
$ git rebase --committer-date-is-author-date --onto branch_K branch_L~1 branch_L
$ git checkout --theirs file
$ git add file
$ git rebase --continue
fatal: invalid date format: @@2592000 +0000
error: could not commit staged changes.
This isn't reproducible without --committer-date-is-author-date.
More context (the test where it happens) is in [2].
4. I suspect the exit status in the "you need to resolve conflicts"
case has changed. With rebase --am, [3] would automatically
invoke rebase --abort when conflicts are present, but with rebase
--merge it does not.
Known?
Thanks,
Jonathan
[1] https://fuchsia.googlesource.com/jiri/+/60436c301224231cb99be41ce937dfc223bee272/project/manifest.go#1347
[2] https://source.chromium.org/chromium/chromium/tools/depot_tools/+/master:tests/git_common_test.py;l=721;drc=6b52dc21e166c46707b4c8eb26c74c70d4f9977e;bpv=1;bpt=0
[3] https://fuchsia.googlesource.com/jiri/+/60436c301224231cb99be41ce937dfc223bee272/project/project.go#1664
next prev parent reply other threads:[~2020-01-10 23:14 UTC|newest]
Thread overview: 161+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-20 17:09 [PATCH 00/15] rebase: make the default backend configurable Elijah Newren via GitGitGadget
2019-12-20 17:09 ` [PATCH 01/15] rebase: extend the options for handling of empty commits Elijah Newren via GitGitGadget
2019-12-20 21:29 ` Junio C Hamano
2019-12-21 0:32 ` Elijah Newren
2019-12-21 18:52 ` Elijah Newren
2019-12-21 23:49 ` Junio C Hamano
2019-12-20 17:09 ` [PATCH 02/15] t3406: simplify an already simple test Elijah Newren via GitGitGadget
2019-12-20 17:09 ` [PATCH 03/15] rebase, sequencer: remove the broken GIT_QUIET handling Elijah Newren via GitGitGadget
2019-12-20 21:34 ` Junio C Hamano
2019-12-20 17:09 ` [PATCH 04/15] rebase: make sure to pass along the quiet flag to the sequencer Elijah Newren via GitGitGadget
2019-12-20 17:09 ` [PATCH 05/15] rebase: fix handling of restrict_revision Elijah Newren via GitGitGadget
2019-12-20 21:37 ` Junio C Hamano
2019-12-20 17:09 ` [PATCH 06/15] t3432: make these tests work with either am or merge backends Elijah Newren via GitGitGadget
2019-12-22 5:11 ` Denton Liu
2019-12-23 17:17 ` Elijah Newren
2019-12-20 17:09 ` [PATCH 07/15] rebase: allow more types of rebases to fast-forward Elijah Newren via GitGitGadget
2019-12-20 17:09 ` [PATCH 08/15] git-rebase.txt: add more details about behavioral differences of backends Elijah Newren via GitGitGadget
2019-12-20 17:09 ` [PATCH 09/15] rebase: move incompatibility checks between backend options a bit earlier Elijah Newren via GitGitGadget
2019-12-20 17:09 ` [PATCH 10/15] rebase: add an --am option Elijah Newren via GitGitGadget
2019-12-20 17:09 ` [PATCH 11/15] contrib: change the prompt for am-based rebases Elijah Newren via GitGitGadget
2019-12-20 23:07 ` SZEDER Gábor
2019-12-21 0:17 ` Elijah Newren
2019-12-20 17:09 ` [PATCH 12/15] rebase tests: mark tests specific to the am-backend with --am Elijah Newren via GitGitGadget
2019-12-20 17:09 ` [PATCH 13/15] rebase tests: repeat some tests using the merge backend instead of am Elijah Newren via GitGitGadget
2019-12-20 17:09 ` [PATCH 14/15] rebase: make the backend configurable via config setting Elijah Newren via GitGitGadget
2019-12-20 17:09 ` [PATCH 15/15] rebase: change the default backend from "am" to "merge" Elijah Newren via GitGitGadget
2019-12-20 18:51 ` [PATCH 00/15] rebase: make the default backend configurable Alban Gruin
2019-12-20 18:55 ` Elijah Newren
2019-12-23 18:49 ` [PATCH v2 " Elijah Newren via GitGitGadget
2019-12-23 18:49 ` [PATCH v2 01/15] rebase: extend the options for handling of empty commits Elijah Newren via GitGitGadget
2019-12-23 18:49 ` [PATCH v2 02/15] t3406: simplify an already simple test Elijah Newren via GitGitGadget
2019-12-23 18:49 ` [PATCH v2 03/15] rebase, sequencer: remove the broken GIT_QUIET handling Elijah Newren via GitGitGadget
2019-12-23 18:49 ` [PATCH v2 04/15] rebase: make sure to pass along the quiet flag to the sequencer Elijah Newren via GitGitGadget
2019-12-23 18:49 ` [PATCH v2 05/15] rebase: fix handling of restrict_revision Elijah Newren via GitGitGadget
2019-12-23 18:49 ` [PATCH v2 06/15] t3432: make these tests work with either am or merge backends Elijah Newren via GitGitGadget
2019-12-23 18:49 ` [PATCH v2 07/15] rebase: allow more types of rebases to fast-forward Elijah Newren via GitGitGadget
2019-12-23 18:49 ` [PATCH v2 08/15] git-rebase.txt: add more details about behavioral differences of backends Elijah Newren via GitGitGadget
2019-12-23 18:49 ` [PATCH v2 09/15] rebase: move incompatibility checks between backend options a bit earlier Elijah Newren via GitGitGadget
2019-12-23 18:49 ` [PATCH v2 10/15] rebase: add an --am option Elijah Newren via GitGitGadget
2019-12-23 18:49 ` [PATCH v2 11/15] contrib: change the prompt for interactive-based rebases Elijah Newren via GitGitGadget
2019-12-23 22:00 ` Denton Liu
2019-12-23 18:49 ` [PATCH v2 12/15] rebase tests: mark tests specific to the am-backend with --am Elijah Newren via GitGitGadget
2019-12-23 18:49 ` [PATCH v2 13/15] rebase tests: repeat some tests using the merge backend instead of am Elijah Newren via GitGitGadget
2019-12-23 18:49 ` [PATCH v2 14/15] rebase: make the backend configurable via config setting Elijah Newren via GitGitGadget
2019-12-23 18:49 ` [PATCH v2 15/15] rebase: change the default backend from "am" to "merge" Elijah Newren via GitGitGadget
2019-12-24 19:54 ` [PATCH v3 00/15] rebase: make the default backend configurable Elijah Newren via GitGitGadget
2019-12-24 19:54 ` [PATCH v3 01/15] rebase: extend the options for handling of empty commits Elijah Newren via GitGitGadget
2020-01-07 14:37 ` Phillip Wood
2020-01-07 19:15 ` Elijah Newren
2020-01-08 14:27 ` Phillip Wood
2020-01-09 21:32 ` Johannes Schindelin
2019-12-24 19:54 ` [PATCH v3 02/15] t3406: simplify an already simple test Elijah Newren via GitGitGadget
2019-12-24 19:54 ` [PATCH v3 03/15] rebase, sequencer: remove the broken GIT_QUIET handling Elijah Newren via GitGitGadget
2019-12-24 19:54 ` [PATCH v3 04/15] rebase: make sure to pass along the quiet flag to the sequencer Elijah Newren via GitGitGadget
2019-12-24 19:54 ` [PATCH v3 05/15] rebase: fix handling of restrict_revision Elijah Newren via GitGitGadget
2019-12-24 19:54 ` [PATCH v3 06/15] t3432: make these tests work with either am or merge backends Elijah Newren via GitGitGadget
2019-12-24 19:54 ` [PATCH v3 07/15] rebase: allow more types of rebases to fast-forward Elijah Newren via GitGitGadget
2019-12-24 19:54 ` [PATCH v3 08/15] git-rebase.txt: add more details about behavioral differences of backends Elijah Newren via GitGitGadget
2019-12-24 19:54 ` [PATCH v3 09/15] rebase: move incompatibility checks between backend options a bit earlier Elijah Newren via GitGitGadget
2019-12-24 19:54 ` [PATCH v3 10/15] rebase: add an --am option Elijah Newren via GitGitGadget
2020-01-07 14:43 ` Phillip Wood
2020-01-07 19:26 ` Elijah Newren
2020-01-07 20:11 ` Junio C Hamano
2020-01-08 14:32 ` Phillip Wood
2020-01-08 17:18 ` Junio C Hamano
2020-01-08 18:55 ` Phillip Wood
2019-12-24 19:54 ` [PATCH v3 11/15] git-prompt: change the prompt for interactive-based rebases Elijah Newren via GitGitGadget
2019-12-24 19:54 ` [PATCH v3 12/15] rebase tests: mark tests specific to the am-backend with --am Elijah Newren via GitGitGadget
2019-12-24 19:54 ` [PATCH v3 13/15] rebase tests: repeat some tests using the merge backend instead of am Elijah Newren via GitGitGadget
2019-12-24 19:54 ` [PATCH v3 14/15] rebase: make the backend configurable via config setting Elijah Newren via GitGitGadget
2019-12-24 19:54 ` [PATCH v3 15/15] rebase: change the default backend from "am" to "merge" Elijah Newren via GitGitGadget
2020-01-10 23:14 ` Jonathan Nieder [this message]
2020-01-11 1:16 ` Elijah Newren
2020-01-11 14:41 ` Phillip Wood
2020-01-12 17:59 ` Johannes Schindelin
2020-01-16 6:32 ` Elijah Newren
2020-01-16 7:58 ` Jonathan Nieder
2020-01-16 8:06 ` Jonathan Nieder
2020-01-16 16:18 ` Elijah Newren
2020-01-16 20:35 ` Jonathan Nieder
2020-01-16 21:30 ` Elijah Newren
2020-01-16 22:39 ` Jonathan Nieder
2020-01-16 23:19 ` Elijah Newren
2020-01-16 23:25 ` Junio C Hamano
2020-01-17 0:51 ` Elijah Newren
2020-01-16 15:35 ` Elijah Newren
2020-01-16 20:05 ` Junio C Hamano
2020-01-16 10:48 ` Johannes Schindelin
2020-01-12 21:23 ` Junio C Hamano
2020-01-15 19:50 ` Jonathan Nieder
2020-01-15 21:59 ` Emily Shaffer
2020-01-16 6:14 ` [PATCH v4 00/19] rebase: make the default backend configurable Elijah Newren via GitGitGadget
2020-01-16 6:14 ` [PATCH v4 01/19] git-rebase.txt: update description of --allow-empty-message Elijah Newren via GitGitGadget
2020-02-09 15:59 ` Phillip Wood
2020-02-13 18:35 ` Elijah Newren
2020-01-16 6:14 ` [PATCH v4 02/19] t3404: directly test the behavior of interest Elijah Newren via GitGitGadget
2020-01-16 6:14 ` [PATCH v4 03/19] rebase (interactive-backend): make --keep-empty the default Elijah Newren via GitGitGadget
2020-02-09 15:59 ` Phillip Wood
2020-02-13 18:52 ` Elijah Newren
2020-01-16 6:14 ` [PATCH v4 04/19] rebase (interactive-backend): fix handling of commits that become empty Elijah Newren via GitGitGadget
2020-02-10 14:27 ` Phillip Wood
2020-02-13 18:54 ` Elijah Newren
2020-02-16 14:46 ` Phillip Wood
2020-01-16 6:14 ` [PATCH v4 05/19] t3406: simplify an already simple test Elijah Newren via GitGitGadget
2020-01-16 6:14 ` [PATCH v4 06/19] rebase, sequencer: remove the broken GIT_QUIET handling Elijah Newren via GitGitGadget
2020-01-16 6:14 ` [PATCH v4 07/19] rebase: make sure to pass along the quiet flag to the sequencer Elijah Newren via GitGitGadget
2020-01-16 6:14 ` [PATCH v4 08/19] rebase: fix handling of restrict_revision Elijah Newren via GitGitGadget
2020-01-16 6:14 ` [PATCH v4 09/19] t3432: make these tests work with either am or merge backends Elijah Newren via GitGitGadget
2020-01-16 6:14 ` [PATCH v4 10/19] rebase: allow more types of rebases to fast-forward Elijah Newren via GitGitGadget
2020-01-16 6:14 ` [PATCH v4 11/19] git-rebase.txt: add more details about behavioral differences of backends Elijah Newren via GitGitGadget
2020-01-16 6:14 ` [PATCH v4 12/19] rebase: move incompatibility checks between backend options a bit earlier Elijah Newren via GitGitGadget
2020-01-16 6:14 ` [PATCH v4 13/19] rebase: add an --am option Elijah Newren via GitGitGadget
2020-01-16 6:14 ` [PATCH v4 14/19] git-prompt: change the prompt for interactive-based rebases Elijah Newren via GitGitGadget
2020-01-16 6:14 ` [PATCH v4 15/19] rebase: drop '-i' from the reflog " Elijah Newren via GitGitGadget
2020-01-16 6:14 ` [PATCH v4 16/19] rebase tests: mark tests specific to the am-backend with --am Elijah Newren via GitGitGadget
2020-01-16 6:14 ` [PATCH v4 17/19] rebase tests: repeat some tests using the merge backend instead of am Elijah Newren via GitGitGadget
2020-01-16 6:14 ` [PATCH v4 18/19] rebase: make the backend configurable via config setting Elijah Newren via GitGitGadget
2020-01-16 6:14 ` [PATCH v4 19/19] rebase: change the default backend from "am" to "merge" Elijah Newren via GitGitGadget
2020-01-17 16:58 ` [PATCH v4 00/19] rebase: make the default backend configurable Phillip Wood
2020-02-05 21:06 ` Junio C Hamano
2020-02-05 22:38 ` Elijah Newren
2020-02-15 21:36 ` [PATCH v5 00/20] rebase: make the default backend configurable and change the default Elijah Newren via GitGitGadget
2020-02-15 21:36 ` [PATCH v5 01/20] git-rebase.txt: update description of --allow-empty-message Elijah Newren via GitGitGadget
2020-02-15 21:36 ` [PATCH v5 02/20] t3404: directly test the behavior of interest Elijah Newren via GitGitGadget
2020-02-15 21:36 ` [PATCH v5 03/20] rebase (interactive-backend): make --keep-empty the default Elijah Newren via GitGitGadget
2020-02-15 21:36 ` [PATCH v5 04/20] rebase (interactive-backend): fix handling of commits that become empty Elijah Newren via GitGitGadget
2020-02-15 21:36 ` [PATCH v5 05/20] t3406: simplify an already simple test Elijah Newren via GitGitGadget
2020-02-15 21:36 ` [PATCH v5 06/20] rebase, sequencer: remove the broken GIT_QUIET handling Elijah Newren via GitGitGadget
2020-02-15 21:36 ` [PATCH v5 07/20] rebase: make sure to pass along the quiet flag to the sequencer Elijah Newren via GitGitGadget
2020-02-15 21:36 ` [PATCH v5 08/20] rebase: fix handling of restrict_revision Elijah Newren via GitGitGadget
2020-02-15 21:36 ` [PATCH v5 09/20] t3432: make these tests work with either am or merge backends Elijah Newren via GitGitGadget
2020-02-15 21:36 ` [PATCH v5 10/20] rebase: allow more types of rebases to fast-forward Elijah Newren via GitGitGadget
2020-02-15 21:36 ` [PATCH v5 11/20] git-rebase.txt: add more details about behavioral differences of backends Elijah Newren via GitGitGadget
2020-02-15 21:36 ` [PATCH v5 12/20] rebase: move incompatibility checks between backend options a bit earlier Elijah Newren via GitGitGadget
2020-02-15 21:36 ` [PATCH v5 13/20] rebase: add an --am option Elijah Newren via GitGitGadget
2020-02-15 21:36 ` [PATCH v5 14/20] git-prompt: change the prompt for interactive-based rebases Elijah Newren via GitGitGadget
2020-02-15 21:36 ` [PATCH v5 15/20] rebase: drop '-i' from the reflog " Elijah Newren via GitGitGadget
2020-02-15 21:36 ` [PATCH v5 16/20] rebase tests: mark tests specific to the am-backend with --am Elijah Newren via GitGitGadget
2020-02-15 21:36 ` [PATCH v5 17/20] rebase tests: repeat some tests using the merge backend instead of am Elijah Newren via GitGitGadget
2020-02-15 21:36 ` [PATCH v5 18/20] rebase: make the backend configurable via config setting Elijah Newren via GitGitGadget
2020-02-15 21:36 ` [PATCH v5 19/20] rebase: change the default backend from "am" to "merge" Elijah Newren via GitGitGadget
2020-02-15 21:36 ` [PATCH v5 20/20] rebase: rename the two primary rebase backends Elijah Newren via GitGitGadget
2020-03-12 15:13 ` Emily Shaffer
2020-03-12 16:33 ` Elijah Newren
2020-03-12 17:55 ` Jonathan Nieder
2020-03-12 18:39 ` Elijah Newren
2020-03-12 18:46 ` Jonathan Nieder
2020-03-12 19:31 ` Elijah Newren
2020-03-17 2:58 ` Jonathan Nieder
2020-03-17 4:45 ` Elijah Newren
2020-03-12 19:54 ` Junio C Hamano
2020-03-12 19:07 ` Junio C Hamano
2020-03-12 19:12 ` Jonathan Nieder
2020-03-12 19:12 ` Junio C Hamano
2020-03-12 19:29 ` Elijah Newren
2020-03-12 20:37 ` Jeff King
2020-03-12 21:27 ` Junio C Hamano
2020-03-12 22:06 ` Elijah Newren
2020-03-13 0:04 ` Junio C Hamano
2020-03-12 23:30 ` Jonathan Nieder
2020-02-16 15:01 ` [PATCH v5 00/20] rebase: make the default backend configurable and change the default Phillip Wood
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