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Git-merge-file is documented to return one of three exit codes: - zero means the merge was successful - a negative number means an error occurred - a positive number indicates the number of conflicts Unfortunately, this all gets stuffed into an 8-bit return code. Which means that if you have 256 conflicts, this wraps to zero, and the merge appears to succeed (and commits a blob full of conflict-marker cruft!). This patch clamps the return value to a maximum of 127, which we should be able to safely represent everywhere. This also leaves 128-255 for other values. Shells (and some parts of git) will typically represent signal death as 128 plus the signal number. And negative values are typically coerced to an 8-bit unsigned value (so "return -1" ends up as 255). Technically negative returns have the same problem (e.g., "-256" wraps back to 0), but this is not a problem in practice, as the only negative value we use is "-1". Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
96 lines
2.8 KiB
Plaintext
96 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|--union] [-p|--stdout] [-q|--quiet] [--marker-size=<n>]
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[--[no-]diff3] <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`, `--theirs`, or `--union` option is in effect,
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however, these conflicts are resolved favouring lines from `<current-file>`,
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lines from `<other-file>`, or lines from both respectively. The length of the
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conflict markers can be given with the `--marker-size` option.
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The exit value of this program is negative on error, and the number of
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conflicts otherwise (truncated to 127 if there are more than that many
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conflicts). 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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--diff3::
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Show conflicts in "diff3" style.
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--ours::
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--theirs::
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--union::
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Instead of leaving conflicts in the file, resolve conflicts
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favouring our (or their or both) 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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GIT
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---
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Part of the linkgit:git[1] suite
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