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From: Johannes Schindelin <johannes.schindelin@gmx.de>
To: git@vger.kernel.org
Cc: Johannes Schindelin <johannes.schindelin@gmx.de>,
	Junio C Hamano <gitster@pobox.com>,
	Alban Gruin <alban.gruin@gmail.com>,
	Pratik Karki <predatoramigo@gmail.com>,
	Christian Couder <christian.couder@gmail.com>,
	Stefan Beller <sbeller@google.com>,
	Wink Saville <wink@saville.com>
Subject: [PATCH 0/6] Let the sequencer handle `git rebase -i --root`
Date: Sat, 28 Apr 2018 00:29:26 +0200	[thread overview]
Message-ID: <cover.1524868165.git.johannes.schindelin@gmx.de> (raw)

When I reimplemented the most performance-critical bits of the
interactive rebase in the sequencer, to speed up `git rebase -i`
particularly on Windows (even if the benefits are still quite notable on
Linux or macOS), I punted on the --root part.

I had always hoped that some other contributor (or I myself) would come
back later to address the --root part in the sequencer, too, with the
idea that this would move the last remaining complicated code from
git-rebase--interactive.sh into sequencer.c, to facilitate converting
the rest of git-rebase--interactive.sh.

When I say "the last remaining complicated code", of course I neglect
the --preserve-merges code, but as I worked hard on the --rebase-merges
patch series with the intention to eventually deprecate and maybe even
remove the --preserve-merges mode, I always implicitly assume that the
--preserve-merges code will be moved into its own shell script
(git-rebase--preserve-merges.sh, maybe?) and never be converted.

So here goes: the patches to move the handling of --root into the
sequencer. After two preparatory patches, the real conversion takes
place in the third patch. After that, we take care of the --root related
concerns that arise in conjunction with the --rebase-merges mode.

As the --rebase-merges/--root patches overlap quite a bit (not so much
in the code itself as in philosophical considerations such as "what
should happen if you try to merge a branch into a new root", or the
fact that the label/reset/merge commands make it desirable to be able to
create a new root commit in the middle of a todo list), I had to
consider in which order to contribute them. In the end, I decided to go
with --rebase-merges first, so the --root patches are based on the
--rebase-merges patch series.

I consider this patch series a critical prerequisite for Alban's Google
Summer of Code project to convert rebase -i into a builtin.


Johannes Schindelin (6):
  sequencer: extract helper to update active_cache_tree
  sequencer: learn about the special "fake root commit" handling
  rebase -i --root: let the sequencer handle even the initial part
  sequencer: allow introducing new root commits
  rebase --rebase-merges: a "merge" into a new root is a fast-forward
  rebase --rebase-merges: root commits can be cousins, too

 git-rebase--interactive.sh        |   4 +-
 sequencer.c                       | 186 ++++++++++++++++++++++++++----
 sequencer.h                       |   4 +
 t/t3404-rebase-interactive.sh     |  19 ++-
 t/t3421-rebase-topology-linear.sh |   6 +-
 t/t3430-rebase-merges.sh          |  72 ++++++++++++
 6 files changed, 256 insertions(+), 35 deletions(-)


base-commit: 673fb9cb8b5c7d57cb560b6ade45e419c8dd09fc
Based-On: recreate-merges at https://github.com/dscho/git
Fetch-Base-Via: git fetch https://github.com/dscho/git recreate-merges
Published-As: https://github.com/dscho/git/releases/tag/sequencer-and-root-commits-v1
Fetch-It-Via: git fetch https://github.com/dscho/git sequencer-and-root-commits-v1
-- 
2.17.0.windows.1.33.gfcbb1fa0445


             reply	other threads:[~2018-04-27 22:30 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-27 22:29 Johannes Schindelin [this message]
2018-04-27 22:30 ` [PATCH 1/6] sequencer: extract helper to update active_cache_tree Johannes Schindelin
2018-04-28 15:28   ` Stefan Beller
2018-04-27 22:31 ` [PATCH 2/6] sequencer: learn about the special "fake root commit" handling Johannes Schindelin
2018-04-28 16:11   ` Stefan Beller
2018-04-29 12:33     ` Johannes Schindelin
2018-04-29 21:44       ` Stefan Beller
2018-04-27 22:31 ` [PATCH 3/6] rebase -i --root: let the sequencer handle even the initial part Johannes Schindelin
2018-04-28 16:19   ` Stefan Beller
2018-04-29 12:34     ` Johannes Schindelin
2018-04-27 22:31 ` [PATCH 4/6] sequencer: allow introducing new root commits Johannes Schindelin
2018-04-27 22:31 ` [PATCH 5/6] rebase --rebase-merges: a "merge" into a new root is a fast-forward Johannes Schindelin
2018-04-27 22:31 ` [PATCH 6/6] rebase --rebase-merges: root commits can be cousins, too Johannes Schindelin
2018-05-03 23:01 ` [PATCH v2 0/6] Let the sequencer handle `git rebase -i --root` Johannes Schindelin
2018-05-03 23:01   ` [PATCH v2 1/6] sequencer: extract helper to update active_cache_tree Johannes Schindelin
2018-05-03 23:01   ` [PATCH v2 2/6] sequencer: learn about the special "fake root commit" handling Johannes Schindelin
2018-05-03 23:01   ` [PATCH v2 3/6] rebase -i --root: let the sequencer handle even the initial part Johannes Schindelin
2018-05-03 23:01   ` [PATCH v2 4/6] sequencer: allow introducing new root commits Johannes Schindelin
2018-05-03 23:01   ` [PATCH v2 5/6] rebase --rebase-merges: a "merge" into a new root is a fast-forward Johannes Schindelin
2018-05-03 23:01   ` [PATCH v2 6/6] rebase --rebase-merges: root commits can be cousins, too Johannes Schindelin
2018-05-04 19:55   ` [PATCH v2 0/6] Let the sequencer handle `git rebase -i --root` Stefan Beller
2018-05-05 19:24     ` Johannes Schindelin

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