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When a series of patches for a topic-B depends on having topic-A,
the workflow to prepare the topic-B branch would look like this:
$ git checkout -b topic-B main
$ git merge --no-ff --no-edit topic-A
$ git am <mbox-for-topic-B
When topic-A gets updated, recreating the first merge and rebasing
the rest of the topic-B, all on detached HEAD, is a useful
technique. After updating topic-A with its new round of patches:
$ git checkout topic-B
$ prev=$(git rev-parse 'HEAD^{/^Merge branch .topic-A. into}')
$ git checkout --detach $prev^1
$ git merge --no-ff --no-edit topic-A
$ git rebase --onto HEAD $prev @{-1}^0
$ git checkout -B @{-1}
This will
(0) check out the current topic-B.
(1) find the previous merge of topic-A into topic-B.
(2) detach the HEAD to the parent of the previous merge.
(3) merge the updated topic-A to it.
(4) reapply the patches to rebuild the rest of topic-B.
(5) update topic-B with the result.
without contaminating the reflog of topic-B too much. topic-B@{1}
is the "logically previous" state before topic-A got updated, for
example. At (4), comparison (e.g. range-diff) between HEAD and
@{-1} is a meaningful way to sanity check the result, and the same
can be done at (5) by comparing topic-B and topic-B@{1}.
But there is one glitch. The merge into the detached HEAD done in
the step (3) above gives us "Merge branch 'topic-A' into HEAD", and
does not say "into topic-B".
Teach the "--into-name=<branch>" option to "git merge" and its
underlying "git fmt-merge-message", to pretend as if we were merging
into <branch>, no matter what branch we are actually merging into,
when they prepare the merge message. The pretend name honors the
usual "into <target>" suppression mechanism, which can be seen in
the tests added here.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
82 lines
1.9 KiB
Text
82 lines
1.9 KiB
Text
git-fmt-merge-msg(1)
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====================
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NAME
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----
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git-fmt-merge-msg - Produce a merge commit message
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SYNOPSIS
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--------
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[verse]
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'git fmt-merge-msg' [-m <message>] [--into-name <branch>] [--log[=<n>] | --no-log]
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'git fmt-merge-msg' [-m <message>] [--log[=<n>] | --no-log] -F <file>
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DESCRIPTION
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-----------
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Takes the list of merged objects on stdin and produces a suitable
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commit message to be used for the merge commit, usually to be
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passed as the '<merge-message>' argument of 'git merge'.
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This command is intended mostly for internal use by scripts
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automatically invoking 'git merge'.
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OPTIONS
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-------
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--log[=<n>]::
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In addition to branch names, populate the log message with
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one-line descriptions from the actual commits that are being
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merged. At most <n> commits from each merge parent will be
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used (20 if <n> is omitted). This overrides the `merge.log`
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configuration variable.
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--no-log::
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Do not list one-line descriptions from the actual commits being
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merged.
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--[no-]summary::
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Synonyms to --log and --no-log; these are deprecated and will be
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removed in the future.
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-m <message>::
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--message <message>::
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Use <message> instead of the branch names for the first line
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of the log message. For use with `--log`.
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--into-name <branch>::
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Prepare the merge message as if merging to the branch `<branch>`,
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instead of the name of the real branch to which the merge is made.
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-F <file>::
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--file <file>::
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Take the list of merged objects from <file> instead of
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stdin.
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CONFIGURATION
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-------------
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include::config/fmt-merge-msg.txt[]
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merge.summary::
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Synonym to `merge.log`; this is deprecated and will be removed in
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the future.
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EXAMPLES
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--------
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---------
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$ git fetch origin master
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$ git fmt-merge-msg --log <$GIT_DIR/FETCH_HEAD
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---------
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Print a log message describing a merge of the "master" branch from
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the "origin" remote.
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SEE ALSO
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--------
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linkgit:git-merge[1]
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GIT
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---
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Part of the linkgit:git[1] suite
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