git.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: "Elijah Newren via GitGitGadget" <gitgitgadget@gmail.com>
To: git@vger.kernel.org
Cc: Christian Couder <chriscool@tuxfamily.org>,
	Taylor Blau <me@ttaylorr.com>, Elijah Newren <newren@gmail.com>
Subject: [PATCH 0/8] RFC: Server side merges (no ref updating, no commit creating, no touching worktree or index)
Date: Fri, 31 Dec 2021 05:03:56 +0000	[thread overview]
Message-ID: <pull.1114.git.git.1640927044.gitgitgadget@gmail.com> (raw)

(NOTE for Junio: This series has a minor conflict with en/remerge-diff --
this series moves a code block into a new function, but en/remerge-diff adds
a BUG() message to that code block. But this series is just RFC, so you may
want to wait to pick it up.)

NOTE2: A preliminary version of this series was discussed here:
https://lore.kernel.org/git/nycvar.QRO.7.76.6.2110211147490.56@tvgsbejvaqbjf.bet/

This series introduces a new option to git-merge-tree: --real (best name I
could come up with). This new option is designed to allow a server-side
"real" merge (or allow folks client-side to do merges with branches they
don't even have checked out). Real merges differ from trivial merges in that
they handle:

 * three way content merges
 * recursive ancestor consolidation
 * renames
 * proper directory/file conflict handling
 * etc.

The reason this is different from merge is that merge-tree does NOT:

 * Read/write/update any working tree (and assumes there probably isn't one)
 * Read/write/update any index (and assumes there probably isn't one)
 * Create a commit object
 * Update any refs

This series attempts to guess what kind of output would be wanted, basically
choosing:

 * clean merge or conflict signalled via exit status
 * stdout consists solely of printing the hash of the resulting tree (though
   that tree may include files that have conflict markers)
 * new optional --messages flag for specifying a file where informational
   messages (e.g. conflict notices and files involved in three-way-content
   merges) can be written; by default, this output is simply discarded
 * new optional --conflicted-list flag for specifying a file where the names
   of conflicted-files can be written in a NUL-character-separated list

This design means it's basically just a low-level tool that other scripts
would use and do additional work with. Perhaps something like this:

   NEWTREE=$(git merge-tree --real $BRANCH1 $BRANCH2)
   test $? -eq 0 || die "There were conflicts..."
   NEWCOMMIT=$(git commit-tree $NEWTREE -p $BRANCH1 $BRANCH2)
   git update-ref $BRANCH1 $NEWCOMMIT


Elijah Newren (8):
  merge-tree: rename merge_trees() to trivial_merge_trees()
  merge-tree: move logic for existing merge into new function
  merge-tree: add option parsing and initial shell for real merge
    function
  merge-tree: implement real merges
  merge-ort: split out a separate display_update_messages() function
  merge-ort: allow update messages to be written to different file
    stream
  merge-tree: support saving merge messages to a separate file
  merge-tree: provide an easy way to access which files have conflicts

 Documentation/git-merge-tree.txt |  32 +++++--
 builtin/merge-tree.c             | 152 ++++++++++++++++++++++++++++---
 git.c                            |   2 +-
 merge-ort.c                      |  85 ++++++++++-------
 merge-ort.h                      |  12 +++
 t/t4301-merge-tree-real.sh       | 108 ++++++++++++++++++++++
 6 files changed, 333 insertions(+), 58 deletions(-)
 create mode 100755 t/t4301-merge-tree-real.sh


base-commit: 2ae0a9cb8298185a94e5998086f380a355dd8907
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-git-1114%2Fnewren%2Fmerge-into-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-git-1114/newren/merge-into-v1
Pull-Request: https://github.com/git/git/pull/1114
-- 
gitgitgadget

             reply	other threads:[~2021-12-31  5:04 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-31  5:03 Elijah Newren via GitGitGadget [this message]
2021-12-31  5:03 ` [PATCH 1/8] merge-tree: rename merge_trees() to trivial_merge_trees() Elijah Newren via GitGitGadget
2021-12-31  5:03 ` [PATCH 2/8] merge-tree: move logic for existing merge into new function Elijah Newren via GitGitGadget
2022-01-01 20:11   ` Johannes Altmanninger
2022-01-01 20:17     ` Elijah Newren
2021-12-31  5:03 ` [PATCH 3/8] merge-tree: add option parsing and initial shell for real merge function Elijah Newren via GitGitGadget
2021-12-31  5:04 ` [PATCH 4/8] merge-tree: implement real merges Elijah Newren via GitGitGadget
2022-01-01 20:08   ` Johannes Altmanninger
2022-01-01 21:11     ` Elijah Newren
2022-01-03 12:23   ` Fabian Stelzer
2022-01-03 16:37     ` Elijah Newren
2021-12-31  5:04 ` [PATCH 5/8] merge-ort: split out a separate display_update_messages() function Elijah Newren via GitGitGadget
2022-01-03 12:15   ` Fabian Stelzer
2022-01-03 12:25     ` Fabian Stelzer
2021-12-31  5:04 ` [PATCH 6/8] merge-ort: allow update messages to be written to different file stream Elijah Newren via GitGitGadget
2022-01-01 20:08   ` Johannes Altmanninger
2022-01-01 20:19     ` Elijah Newren
2021-12-31  5:04 ` [PATCH 7/8] merge-tree: support saving merge messages to a separate file Elijah Newren via GitGitGadget
2022-01-03 12:31   ` Fabian Stelzer
2022-01-03 16:51     ` Elijah Newren
2022-01-03 17:22       ` Fabian Stelzer
2022-01-03 19:46         ` Elijah Newren
2022-01-04 13:05           ` Fabian Stelzer
2022-01-03 12:35   ` Fabian Stelzer
2022-01-03 16:55     ` Elijah Newren
2021-12-31  5:04 ` [PATCH 8/8] merge-tree: provide an easy way to access which files have conflicts Elijah Newren via GitGitGadget
2022-01-05 17:27 ` [PATCH v2 0/8] RFC: Server side merges (no ref updating, no commit creating, no touching worktree or index) Elijah Newren via GitGitGadget
2022-01-05 17:27   ` [PATCH v2 1/8] merge-tree: rename merge_trees() to trivial_merge_trees() Elijah Newren via GitGitGadget
2022-01-05 17:27   ` [PATCH v2 2/8] merge-tree: move logic for existing merge into new function Elijah Newren via GitGitGadget
2022-01-05 17:27   ` [PATCH v2 3/8] merge-tree: add option parsing and initial shell for real merge function Elijah Newren via GitGitGadget
2022-01-05 17:27   ` [PATCH v2 4/8] merge-tree: implement real merges Elijah Newren via GitGitGadget
2022-01-07 15:30     ` Johannes Schindelin
2022-01-07 17:26       ` Elijah Newren
2022-01-07 18:22         ` Johannes Schindelin
2022-01-07 19:15           ` Elijah Newren
2022-01-07 20:56         ` Junio C Hamano
2022-01-11 13:39           ` Johannes Schindelin
2022-01-07 18:12     ` Christian Couder
2022-01-07 19:09       ` Elijah Newren
2022-01-05 17:27   ` [PATCH v2 5/8] merge-ort: split out a separate display_update_messages() function Elijah Newren via GitGitGadget
2022-01-05 17:27   ` [PATCH v2 6/8] merge-ort: allow update messages to be written to different file stream Elijah Newren via GitGitGadget
2022-01-05 17:27   ` [PATCH v2 7/8] merge-tree: support saving merge messages to a separate file Elijah Newren via GitGitGadget
2022-01-07 18:07     ` Johannes Schindelin
2022-01-08  1:02       ` Elijah Newren
2022-01-05 17:27   ` [PATCH v2 8/8] merge-tree: provide an easy way to access which files have conflicts Elijah Newren via GitGitGadget
2022-01-05 19:09     ` Ramsay Jones
2022-01-05 19:17       ` Elijah Newren
2022-01-07 19:36     ` Johannes Schindelin
2022-01-07 22:12       ` Elijah Newren
2022-02-22 13:03         ` Johannes Schindelin
2022-01-08  1:28       ` Elijah Newren
2022-02-22 13:05         ` Johannes Schindelin
2022-01-05 20:18   ` [PATCH v2 0/8] RFC: Server side merges (no ref updating, no commit creating, no touching worktree or index) Junio C Hamano
2022-01-05 22:35     ` Elijah Newren
2022-01-07 18:46   ` Christian Couder
2022-01-07 19:59     ` Elijah Newren
2022-01-07 21:26       ` René Scharfe

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=pull.1114.git.git.1640927044.gitgitgadget@gmail.com \
    --to=gitgitgadget@gmail.com \
    --cc=chriscool@tuxfamily.org \
    --cc=git@vger.kernel.org \
    --cc=me@ttaylorr.com \
    --cc=newren@gmail.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).