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List: git
Subject: [PATCH 0/8] RFC: Server side merges (no ref updating, no commit creating, no touching worktree or in
From: "Elijah Newren via GitGitGadget" <gitgitgadget () gmail ! com>
Date: 2021-12-31 5:03:56
Message-ID: pull.1114.git.git.1640927044.gitgitgadget () gmail ! com
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(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
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