2007-06-25 00:11:14 +00:00
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#!/bin/sh
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#
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# Copyright (c) 2006 Johannes E. Schindelin
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# SHORT DESCRIPTION
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#
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# This script makes it easy to fix up commits in the middle of a series,
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# and rearrange commits.
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#
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# The original idea comes from Eric W. Biederman, in
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# http://article.gmane.org/gmane.comp.version-control.git/22407
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2007-06-25 17:59:43 +00:00
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USAGE='(--continue | --abort | --skip | [--preserve-merges] [--verbose]
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[--onto <branch>] <upstream> [<branch>])'
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2007-06-25 00:11:14 +00:00
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. git-sh-setup
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require_work_tree
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DOTEST="$GIT_DIR/.dotest-merge"
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TODO="$DOTEST"/todo
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DONE="$DOTEST"/done
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2007-06-25 17:59:43 +00:00
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REWRITTEN="$DOTEST"/rewritten
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PRESERVE_MERGES=
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2007-06-25 00:11:14 +00:00
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STRATEGY=
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VERBOSE=
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warn () {
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echo "$*" >&2
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}
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require_clean_work_tree () {
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# test if working tree is dirty
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git rev-parse --verify HEAD > /dev/null &&
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git update-index --refresh &&
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git diff-files --quiet &&
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git diff-index --cached --quiet HEAD ||
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die "Working tree is dirty"
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}
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ORIG_REFLOG_ACTION="$GIT_REFLOG_ACTION"
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comment_for_reflog () {
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case "$ORIG_REFLOG_ACTION" in
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''|rebase*)
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GIT_REFLOG_ACTION="rebase -i ($1)"
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export GIT_REFLOG_ACTION
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esac
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}
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mark_action_done () {
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sed -e 1q < "$TODO" >> "$DONE"
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sed -e 1d < "$TODO" >> "$TODO".new
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mv -f "$TODO".new "$TODO"
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}
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make_patch () {
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parent_sha1=$(git rev-parse --verify "$1"^ 2> /dev/null)
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git diff "$parent_sha1".."$1" > "$DOTEST"/patch
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}
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die_with_patch () {
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make_patch "$1"
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die "$2"
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}
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2007-06-25 17:56:55 +00:00
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die_abort () {
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rm -rf "$DOTEST"
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die "$1"
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}
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2007-06-25 00:11:14 +00:00
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pick_one () {
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case "$1" in -n) sha1=$2 ;; *) sha1=$1 ;; esac
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git rev-parse --verify $sha1 || die "Invalid commit name: $sha1"
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2007-06-25 17:59:43 +00:00
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test -d "$REWRITTEN" &&
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pick_one_preserving_merges "$@" && return
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2007-06-25 00:11:14 +00:00
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parent_sha1=$(git rev-parse --verify $sha1^ 2>/dev/null)
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current_sha1=$(git rev-parse --verify HEAD)
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if [ $current_sha1 = $parent_sha1 ]; then
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git reset --hard $sha1
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sha1=$(git rev-parse --short $sha1)
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warn Fast forward to $sha1
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else
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git cherry-pick $STRATEGY "$@"
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fi
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}
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2007-06-25 17:59:43 +00:00
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pick_one_preserving_merges () {
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case "$1" in -n) sha1=$2 ;; *) sha1=$1 ;; esac
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sha1=$(git rev-parse $sha1)
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if [ -f "$DOTEST"/current-commit ]
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then
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current_commit=$(cat "$DOTEST"/current-commit) &&
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git rev-parse HEAD > "$REWRITTEN"/$current_commit &&
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rm "$DOTEST"/current-commit ||
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die "Cannot write current commit's replacement sha1"
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fi
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# rewrite parents; if none were rewritten, we can fast-forward.
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fast_forward=t
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preserve=t
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new_parents=
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for p in $(git rev-list --parents -1 $sha1 | cut -d\ -f2-)
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do
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if [ -f "$REWRITTEN"/$p ]
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then
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preserve=f
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new_p=$(cat "$REWRITTEN"/$p)
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test $p != $new_p && fast_forward=f
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case "$new_parents" in
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*$new_p*)
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;; # do nothing; that parent is already there
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*)
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new_parents="$new_parents $new_p"
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esac
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fi
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done
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case $fast_forward in
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t)
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echo "Fast forward to $sha1"
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test $preserve=f && echo $sha1 > "$REWRITTEN"/$sha1
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;;
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f)
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test "a$1" = a-n && die "Refusing to squash a merge: $sha1"
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first_parent=$(expr "$new_parents" : " \([^ ]*\)")
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# detach HEAD to current parent
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git checkout $first_parent 2> /dev/null ||
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die "Cannot move HEAD to $first_parent"
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echo $sha1 > "$DOTEST"/current-commit
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case "$new_parents" in
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\ *\ *)
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# redo merge
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author_script=$(get_author_ident_from_commit $sha1)
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eval "$author_script"
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msg="$(git cat-file commit $sha1 | \
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sed -e '1,/^$/d' -e "s/[\"\\]/\\\\&/g")"
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# NEEDSWORK: give rerere a chance
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if ! git merge $STRATEGY -m "$msg" $new_parents
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then
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echo "$msg" > "$GIT_DIR"/MERGE_MSG
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warn Error redoing merge $sha1
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warn
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warn After fixup, please use
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die "$author_script git commit"
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fi
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;;
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*)
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git cherry-pick $STRATEGY "$@" ||
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die_with_patch $sha1 "Could not pick $sha1"
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esac
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esac
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}
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2007-06-25 00:11:14 +00:00
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do_next () {
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read command sha1 rest < "$TODO"
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case "$command" in
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\#|'')
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mark_action_done
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continue
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;;
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pick)
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comment_for_reflog pick
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mark_action_done
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pick_one $sha1 ||
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die_with_patch $sha1 "Could not apply $sha1... $rest"
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;;
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edit)
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comment_for_reflog edit
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mark_action_done
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pick_one $sha1 ||
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die_with_patch $sha1 "Could not apply $sha1... $rest"
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make_patch $sha1
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warn
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warn "You can amend the commit now, with"
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warn
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warn " git commit --amend"
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warn
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exit 0
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;;
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squash)
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comment_for_reflog squash
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test -z "$(grep -ve '^$' -e '^#' < $DONE)" &&
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die "Cannot 'squash' without a previous commit"
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mark_action_done
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failed=f
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pick_one -n $sha1 || failed=t
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MSG="$DOTEST"/message
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echo "# This is a combination of two commits." > "$MSG"
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echo "# The first commit's message is:" >> "$MSG"
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echo >> "$MSG"
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git cat-file commit HEAD | sed -e '1,/^$/d' >> "$MSG"
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echo >> "$MSG"
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echo "# And this is the 2nd commit message:" >> "$MSG"
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echo >> "$MSG"
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git cat-file commit $sha1 | sed -e '1,/^$/d' >> "$MSG"
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git reset --soft HEAD^
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author_script=$(get_author_ident_from_commit $sha1)
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case $failed in
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f)
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# This is like --amend, but with a different message
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eval "$author_script"
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export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_AUTHOR_DATE
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git commit -F "$MSG" -e
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;;
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t)
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cp "$MSG" "$GIT_DIR"/MERGE_MSG
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warn
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warn "Could not apply $sha1... $rest"
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warn "After you fixed that, commit the result with"
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warn
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warn " $(echo $author_script | tr '\012' ' ') \\"
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warn " git commit -F \"$GIT_DIR\"/MERGE_MSG -e"
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die_with_patch $sha1 ""
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esac
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;;
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*)
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warn "Unknown command: $command $sha1 $rest"
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die_with_patch $sha1 "Please fix this in the file $TODO."
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esac
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test -s "$TODO" && return
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2007-06-25 17:58:28 +00:00
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comment_for_reflog finish &&
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HEADNAME=$(cat "$DOTEST"/head-name) &&
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OLDHEAD=$(cat "$DOTEST"/head) &&
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SHORTONTO=$(git rev-parse --short $(cat "$DOTEST"/onto)) &&
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2007-06-25 17:59:43 +00:00
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if [ -d "$REWRITTEN" ]
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then
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test -f "$DOTEST"/current-commit &&
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current_commit=$(cat "$DOTEST"/current-commit) &&
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git rev-parse HEAD > "$REWRITTEN"/$current_commit
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NEWHEAD=$(cat "$REWRITTEN"/$OLDHEAD)
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else
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NEWHEAD=$(git rev-parse HEAD)
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fi &&
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2007-06-25 17:58:28 +00:00
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message="$GIT_REFLOG_ACTION: $HEADNAME onto $SHORTONTO)" &&
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git update-ref -m "$message" $HEADNAME $NEWHEAD $OLDHEAD &&
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git symbolic-ref HEAD $HEADNAME &&
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2007-06-25 00:11:14 +00:00
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rm -rf "$DOTEST" &&
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warn "Successfully rebased and updated $HEADNAME."
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exit
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}
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do_rest () {
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while :
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do
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do_next
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done
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test -f "$DOTEST"/verbose &&
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git diff --stat $(cat "$DOTEST"/head)..HEAD
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exit
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}
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while case $# in 0) break ;; esac
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do
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case "$1" in
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--continue)
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comment_for_reflog continue
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test -d "$DOTEST" || die "No interactive rebase running"
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require_clean_work_tree
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do_rest
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;;
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--abort)
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comment_for_reflog abort
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test -d "$DOTEST" || die "No interactive rebase running"
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HEADNAME=$(cat "$DOTEST"/head-name)
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HEAD=$(cat "$DOTEST"/head)
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git symbolic-ref HEAD $HEADNAME &&
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git reset --hard $HEAD &&
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rm -rf "$DOTEST"
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exit
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;;
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--skip)
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comment_for_reflog skip
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test -d "$DOTEST" || die "No interactive rebase running"
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git reset --hard && do_rest
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;;
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-s|--strategy)
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shift
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case "$#,$1" in
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*,*=*)
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STRATEGY="-s `expr "z$1" : 'z-[^=]*=\(.*\)'`" ;;
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1,*)
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usage ;;
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*)
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STRATEGY="-s $2"
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shift ;;
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esac
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;;
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--merge)
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# we use merge anyway
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;;
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-C*)
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die "Interactive rebase uses merge, so $1 does not make sense"
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;;
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2007-06-25 17:56:55 +00:00
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-v|--verbose)
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2007-06-25 00:11:14 +00:00
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VERBOSE=t
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;;
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2007-06-25 17:59:43 +00:00
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-p|--preserve-merges)
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PRESERVE_MERGES=t
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;;
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2007-06-25 00:11:14 +00:00
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-i|--interactive)
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# yeah, we know
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;;
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''|-h)
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usage
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;;
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*)
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test -d "$DOTEST" &&
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die "Interactive rebase already started"
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git var GIT_COMMITTER_IDENT >/dev/null ||
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die "You need to set your committer info first"
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comment_for_reflog start
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ONTO=
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case "$1" in
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--onto)
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ONTO=$(git rev-parse --verify "$2") ||
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die "Does not point to a valid commit: $2"
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shift; shift
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;;
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esac
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require_clean_work_tree
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if [ ! -z "$2"]
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then
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git show-ref --verify --quiet "refs/heads/$2" ||
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die "Invalid branchname: $2"
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git checkout "$2" ||
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die "Could not checkout $2"
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fi
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HEAD=$(git rev-parse --verify HEAD) || die "No HEAD?"
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UPSTREAM=$(git rev-parse --verify "$1") || die "Invalid base"
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test -z "$ONTO" && ONTO=$UPSTREAM
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mkdir "$DOTEST" || die "Could not create temporary $DOTEST"
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: > "$DOTEST"/interactive || die "Could not mark as interactive"
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git symbolic-ref HEAD > "$DOTEST"/head-name ||
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die "Could not get HEAD"
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echo $HEAD > "$DOTEST"/head
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echo $UPSTREAM > "$DOTEST"/upstream
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echo $ONTO > "$DOTEST"/onto
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test t = "$VERBOSE" && : > "$DOTEST"/verbose
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2007-06-25 17:59:43 +00:00
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if [ t = "$PRESERVE_MERGES" ]
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then
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# $REWRITTEN contains files for each commit that is
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# reachable by at least one merge base of $HEAD and
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# $UPSTREAM. They are not necessarily rewritten, but
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# their children might be.
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# This ensures that commits on merged, but otherwise
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# unrelated side branches are left alone. (Think "X"
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# in the man page's example.)
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mkdir "$REWRITTEN" &&
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for c in $(git merge-base --all $HEAD $UPSTREAM)
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do
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echo $ONTO > "$REWRITTEN"/$c ||
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|
|
|
die "Could not init rewritten commits"
|
|
|
|
done
|
|
|
|
MERGES_OPTION=
|
|
|
|
else
|
|
|
|
MERGES_OPTION=--no-merges
|
|
|
|
fi
|
2007-06-25 00:11:14 +00:00
|
|
|
|
2007-06-25 17:56:55 +00:00
|
|
|
SHORTUPSTREAM=$(git rev-parse --short $UPSTREAM)
|
|
|
|
SHORTHEAD=$(git rev-parse --short $HEAD)
|
|
|
|
SHORTONTO=$(git rev-parse --short $ONTO)
|
2007-06-25 00:11:14 +00:00
|
|
|
cat > "$TODO" << EOF
|
2007-06-25 17:56:55 +00:00
|
|
|
# Rebasing $SHORTUPSTREAM..$SHORTHEAD onto $SHORTONTO
|
2007-06-25 00:11:14 +00:00
|
|
|
#
|
|
|
|
# Commands:
|
|
|
|
# pick = use commit
|
|
|
|
# edit = use commit, but stop for amending
|
|
|
|
# squash = use commit, but meld into previous commit
|
|
|
|
EOF
|
2007-06-25 17:59:43 +00:00
|
|
|
git rev-list $MERGES_OPTION --pretty=oneline --abbrev-commit \
|
2007-06-25 00:11:14 +00:00
|
|
|
--abbrev=7 --reverse $UPSTREAM..$HEAD | \
|
|
|
|
sed "s/^/pick /" >> "$TODO"
|
|
|
|
|
|
|
|
test -z "$(grep -ve '^$' -e '^#' < $TODO)" &&
|
2007-06-25 17:56:55 +00:00
|
|
|
die_abort "Nothing to do"
|
2007-06-25 00:11:14 +00:00
|
|
|
|
|
|
|
cp "$TODO" "$TODO".backup
|
|
|
|
${VISUAL:-${EDITOR:-vi}} "$TODO" ||
|
|
|
|
die "Could not execute editor"
|
|
|
|
|
2007-06-25 17:56:55 +00:00
|
|
|
test -z "$(grep -ve '^$' -e '^#' < $TODO)" &&
|
|
|
|
die_abort "Nothing to do"
|
|
|
|
|
|
|
|
git checkout $ONTO && do_rest
|
2007-06-25 00:11:14 +00:00
|
|
|
esac
|
|
|
|
shift
|
|
|
|
done
|