73eb40eeaa
Sometimes people want their conflicting merges autoresolved by favouring upstream changes. The standard answer they are given is to run "git diff --name-only | xargs git checkout MERGE_HEAD --" in such a case. This is to accept automerge results for the paths that are fully resolved automatically, while taking their version of the file in full for paths that have conflicts. This is problematic on two counts. One is that this is not exactly what these people want. It discards all changes they did on their branch for any paths that conflicted. They usually want to salvage as much automerge result as possible in a conflicted file, and want to take the upstream change only in the conflicted part. This patch teaches two new modes of operation to the lowest-lever merge machinery, xdl_merge(). Instead of leaving the conflicted lines from both sides enclosed in <<<, ===, and >>> markers, the conflicts are resolved favouring our side or their side of changes. A larger problem is that this tends to encourage a bad workflow by allowing people to record such a mixed up half-merged result as a full commit without auditing. This commit does not tackle this issue at all. In git, we usually give long enough rope to users with strange wishes as long as the risky features are not enabled by default, and this is such a risky feature. Signed-off-by: Avery Pennarun <apenwarr@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
101 lines
2.8 KiB
Plaintext
101 lines
2.8 KiB
Plaintext
git-merge-file(1)
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=================
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NAME
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----
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git-merge-file - Run a three-way file merge
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SYNOPSIS
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--------
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[verse]
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'git merge-file' [-L <current-name> [-L <base-name> [-L <other-name>]]]
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[--ours|--theirs] [-p|--stdout] [-q|--quiet]
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<current-file> <base-file> <other-file>
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DESCRIPTION
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-----------
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'git-merge-file' incorporates all changes that lead from the `<base-file>`
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to `<other-file>` into `<current-file>`. The result ordinarily goes into
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`<current-file>`. 'git-merge-file' is useful for combining separate changes
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to an original. Suppose `<base-file>` is the original, and both
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`<current-file>` and `<other-file>` are modifications of `<base-file>`,
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then 'git-merge-file' combines both changes.
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A conflict occurs if both `<current-file>` and `<other-file>` have changes
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in a common segment of lines. If a conflict is found, 'git-merge-file'
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normally outputs a warning and brackets the conflict with lines containing
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<<<<<<< and >>>>>>> markers. A typical conflict will look like this:
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<<<<<<< A
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lines in file A
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=======
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lines in file B
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>>>>>>> B
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If there are conflicts, the user should edit the result and delete one of
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the alternatives. When `--ours` or `--theirs` option is in effect, however,
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these conflicts are resolved favouring lines from `<current-file>` or
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lines from `<other-file>` respectively.
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The exit value of this program is negative on error, and the number of
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conflicts otherwise. If the merge was clean, the exit value is 0.
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'git-merge-file' is designed to be a minimal clone of RCS 'merge'; that is, it
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implements all of RCS 'merge''s functionality which is needed by
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linkgit:git[1].
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OPTIONS
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-------
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-L <label>::
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This option may be given up to three times, and
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specifies labels to be used in place of the
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corresponding file names in conflict reports. That is,
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`git merge-file -L x -L y -L z a b c` generates output that
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looks like it came from files x, y and z instead of
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from files a, b and c.
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-p::
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Send results to standard output instead of overwriting
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`<current-file>`.
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-q::
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Quiet; do not warn about conflicts.
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--ours::
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--theirs::
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Instead of leaving conflicts in the file, resolve conflicts
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favouring our (or their) side of the lines.
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EXAMPLES
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--------
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git merge-file README.my README README.upstream::
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combines the changes of README.my and README.upstream since README,
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tries to merge them and writes the result into README.my.
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git merge-file -L a -L b -L c tmp/a123 tmp/b234 tmp/c345::
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merges tmp/a123 and tmp/c345 with the base tmp/b234, but uses labels
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`a` and `c` instead of `tmp/a123` and `tmp/c345`.
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Author
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------
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Written by Johannes Schindelin <johannes.schindelin@gmx.de>
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Documentation
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--------------
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Documentation by Johannes Schindelin and the git-list <git@vger.kernel.org>,
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with parts copied from the original documentation of RCS 'merge'.
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GIT
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---
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Part of the linkgit:git[1] suite
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