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git/contrib/rerere-train.sh
Nanako Shiraishi c11c7a5db3 Add contrib/rerere-train script
This script takes a range of commits (e.g. maint..next) as its arguments,
recreates merge commits in the range to prime rr-cache database.

Signed-off-by: Nanako Shiraishi <nanako3@lavabit.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-09-29 09:15:41 -07:00

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#!/bin/sh
# Copyright (c) 2008, Nanako Shiraishi
# Prime rerere database from existing merge commits
me=rerere-train
USAGE="$me rev-list-args"
SUBDIRECTORY_OK=Yes
OPTIONS_SPEC=
. git-sh-setup
require_work_tree
cd_to_toplevel
# Remember original branch
branch=$(git symbolic-ref -q HEAD) ||
original_HEAD=$(git rev-parse --verify HEAD) || {
echo >&2 "Not on any branch and no commit yet?"
exit 1
}
mkdir -p "$GIT_DIR/rr-cache" || exit
git rev-list --parents "$@" |
while read commit parent1 other_parents
do
if test -z "$other_parents"
then
# Skip non-merges
continue
fi
git checkout -q "$parent1^0"
if git merge $other_parents >/dev/null 2>&1
then
# Cleanly merges
continue
fi
if test -s "$GIT_DIR/MERGE_RR"
then
git show -s --pretty=format:"Learning from %h %s" "$commit"
git rerere
git checkout -q $commit -- .
git rerere
fi
git reset -q --hard
done
if test -z "$branch"
then
git checkout "$original_HEAD"
else
git checkout "${branch#refs/heads/}"
fi