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#!/bin/sh
#
# Copyright (c) 2006 Johannes E. Schindelin
# SHORT DESCRIPTION
#
# This script makes it easy to fix up commits in the middle of a series,
# and rearrange commits.
#
# The original idea comes from Eric W. Biederman, in
# http://article.gmane.org/gmane.comp.version-control.git/22407
USAGE='(--continue | --abort | --skip | [--preserve-merges] [--verbose]
[--onto <branch>] <upstream> [<branch>])'
. git-sh-setup
require_work_tree
DOTEST="$GIT_DIR/.dotest-merge"
TODO="$DOTEST"/git-rebase-todo
DONE="$DOTEST"/done
MSG="$DOTEST"/message
SQUASH_MSG="$DOTEST"/message-squash
REWRITTEN="$DOTEST"/rewritten
PRESERVE_MERGES=
STRATEGY=
VERBOSE=
test -d "$REWRITTEN" && PRESERVE_MERGES=t
test -f "$DOTEST"/strategy && STRATEGY="$(cat "$DOTEST"/strategy)"
test -f "$DOTEST"/verbose && VERBOSE=t
warn () {
echo "$*" >&2
}
output () {
case "$VERBOSE" in
'')
"$@" > "$DOTEST"/output 2>&1
status=$?
test $status != 0 &&
cat "$DOTEST"/output
return $status
;;
*)
"$@"
esac
}
require_clean_work_tree () {
# test if working tree is dirty
git rev-parse --verify HEAD > /dev/null &&
git update-index --refresh &&
git diff-files --quiet &&
git diff-index --cached --quiet HEAD ||
die "Working tree is dirty"
}
ORIG_REFLOG_ACTION="$GIT_REFLOG_ACTION"
comment_for_reflog () {
case "$ORIG_REFLOG_ACTION" in
''|rebase*)
GIT_REFLOG_ACTION="rebase -i ($1)"
export GIT_REFLOG_ACTION
esac
}
mark_action_done () {
sed -e 1q < "$TODO" >> "$DONE"
sed -e 1d < "$TODO" >> "$TODO".new
mv -f "$TODO".new "$TODO"
count=$(($(wc -l < "$DONE")))
total=$(($count+$(wc -l < "$TODO")))
printf "Rebasing (%d/%d)\r" $count $total
test -z "$VERBOSE" || echo
}
make_patch () {
parent_sha1=$(git rev-parse --verify "$1"^ 2> /dev/null)
git diff "$parent_sha1".."$1" > "$DOTEST"/patch
}
die_with_patch () {
test -f "$DOTEST"/message ||
git cat-file commit $sha1 | sed "1,/^$/d" > "$DOTEST"/message
test -f "$DOTEST"/author-script ||
get_author_ident_from_commit $sha1 > "$DOTEST"/author-script
make_patch "$1"
die "$2"
}
die_abort () {
rm -rf "$DOTEST"
die "$1"
}
pick_one () {
no_ff=
case "$1" in -n) sha1=$2; no_ff=t ;; *) sha1=$1 ;; esac
output git rev-parse --verify $sha1 || die "Invalid commit name: $sha1"
test -d "$REWRITTEN" &&
pick_one_preserving_merges "$@" && return
parent_sha1=$(git rev-parse --verify $sha1^ 2>/dev/null)
current_sha1=$(git rev-parse --verify HEAD)
if test $no_ff$current_sha1 = $parent_sha1; then
output git reset --hard $sha1
test "a$1" = a-n && output git reset --soft $current_sha1
sha1=$(git rev-parse --short $sha1)
output warn Fast forward to $sha1
else
output git cherry-pick $STRATEGY "$@"
fi
}
pick_one_preserving_merges () {
case "$1" in -n) sha1=$2 ;; *) sha1=$1 ;; esac
sha1=$(git rev-parse $sha1)
if test -f "$DOTEST"/current-commit
then
current_commit=$(cat "$DOTEST"/current-commit) &&
git rev-parse HEAD > "$REWRITTEN"/$current_commit &&
rm "$DOTEST"/current-commit ||
die "Cannot write current commit's replacement sha1"
fi
# rewrite parents; if none were rewritten, we can fast-forward.
fast_forward=t
preserve=t
new_parents=
for p in $(git rev-list --parents -1 $sha1 | cut -d\ -f2-)
do
if test -f "$REWRITTEN"/$p
then
preserve=f
new_p=$(cat "$REWRITTEN"/$p)
test $p != $new_p && fast_forward=f
case "$new_parents" in
*$new_p*)
;; # do nothing; that parent is already there
*)
new_parents="$new_parents $new_p"
esac
fi
done
case $fast_forward in
t)
output warn "Fast forward to $sha1"
test $preserve=f && echo $sha1 > "$REWRITTEN"/$sha1
;;
f)
test "a$1" = a-n && die "Refusing to squash a merge: $sha1"
first_parent=$(expr "$new_parents" : " \([^ ]*\)")
# detach HEAD to current parent
output git checkout $first_parent 2> /dev/null ||
die "Cannot move HEAD to $first_parent"
echo $sha1 > "$DOTEST"/current-commit
case "$new_parents" in
\ *\ *)
# redo merge
author_script=$(get_author_ident_from_commit $sha1)
eval "$author_script"
msg="$(git cat-file commit $sha1 | \
sed -e '1,/^$/d' -e "s/[\"\\]/\\\\&/g")"
# NEEDSWORK: give rerere a chance
if ! output git merge $STRATEGY -m "$msg" $new_parents
then
echo "$msg" > "$GIT_DIR"/MERGE_MSG
die Error redoing merge $sha1
fi
;;
*)
output git cherry-pick $STRATEGY "$@" ||
die_with_patch $sha1 "Could not pick $sha1"
esac
esac
}
nth_string () {
case "$1" in
*1[0-9]|*[04-9]) echo "$1"th;;
*1) echo "$1"st;;
*2) echo "$1"nd;;
*3) echo "$1"rd;;
esac
}
make_squash_message () {
if test -f "$SQUASH_MSG"; then
COUNT=$(($(sed -n "s/^# This is [^0-9]*\([1-9][0-9]*\).*/\1/p" \
< "$SQUASH_MSG" | tail -n 1)+1))
echo "# This is a combination of $COUNT commits."
sed -n "2,\$p" < "$SQUASH_MSG"
else
COUNT=2
echo "# This is a combination of two commits."
echo "# The first commit's message is:"
echo
git cat-file commit HEAD | sed -e '1,/^$/d'
echo
fi
echo "# This is the $(nth_string $COUNT) commit message:"
echo
git cat-file commit $1 | sed -e '1,/^$/d'
}
peek_next_command () {
sed -n "1s/ .*$//p" < "$TODO"
}
do_next () {
test -f "$DOTEST"/message && rm "$DOTEST"/message
test -f "$DOTEST"/author-script && rm "$DOTEST"/author-script
read command sha1 rest < "$TODO"
case "$command" in
\#|'')
mark_action_done
;;
pick)
comment_for_reflog pick
mark_action_done
pick_one $sha1 ||
die_with_patch $sha1 "Could not apply $sha1... $rest"
;;
edit)
comment_for_reflog edit
mark_action_done
pick_one $sha1 ||
die_with_patch $sha1 "Could not apply $sha1... $rest"
make_patch $sha1
warn
warn "You can amend the commit now, with"
warn
warn " git commit --amend"
warn
exit 0
;;
squash)
comment_for_reflog squash
test -z "$(grep -ve '^$' -e '^#' < $DONE)" &&
die "Cannot 'squash' without a previous commit"
mark_action_done
make_squash_message $sha1 > "$MSG"
case "$(peek_next_command)" in
squash)
EDIT_COMMIT=
USE_OUTPUT=output
cp "$MSG" "$SQUASH_MSG"
;;
*)
EDIT_COMMIT=-e
USE_OUTPUT=
test -f "$SQUASH_MSG" && rm "$SQUASH_MSG"
esac
failed=f
output git reset --soft HEAD^
pick_one -n $sha1 || failed=t
author_script=$(get_author_ident_from_commit $sha1)
echo "$author_script" > "$DOTEST"/author-script
case $failed in
f)
# This is like --amend, but with a different message
eval "$author_script"
export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_AUTHOR_DATE
$USE_OUTPUT git commit -F "$MSG" $EDIT_COMMIT
;;
t)
cp "$MSG" "$GIT_DIR"/MERGE_MSG
warn
warn "Could not apply $sha1... $rest"
die_with_patch $sha1 ""
esac
;;
*)
warn "Unknown command: $command $sha1 $rest"
die_with_patch $sha1 "Please fix this in the file $TODO."
esac
test -s "$TODO" && return
comment_for_reflog finish &&
HEADNAME=$(cat "$DOTEST"/head-name) &&
OLDHEAD=$(cat "$DOTEST"/head) &&
SHORTONTO=$(git rev-parse --short $(cat "$DOTEST"/onto)) &&
if test -d "$REWRITTEN"
then
test -f "$DOTEST"/current-commit &&
current_commit=$(cat "$DOTEST"/current-commit) &&
git rev-parse HEAD > "$REWRITTEN"/$current_commit
NEWHEAD=$(cat "$REWRITTEN"/$OLDHEAD)
else
NEWHEAD=$(git rev-parse HEAD)
fi &&
message="$GIT_REFLOG_ACTION: $HEADNAME onto $SHORTONTO)" &&
git update-ref -m "$message" $HEADNAME $NEWHEAD $OLDHEAD &&
git symbolic-ref HEAD $HEADNAME && {
test ! -f "$DOTEST"/verbose ||
git diff --stat $(cat "$DOTEST"/head)..HEAD
} &&
rm -rf "$DOTEST" &&
warn "Successfully rebased and updated $HEADNAME."
exit
}
do_rest () {
while :
do
do_next
done
}
while case $# in 0) break ;; esac
do
case "$1" in
--continue)
comment_for_reflog continue
test -d "$DOTEST" || die "No interactive rebase running"
# commit if necessary
git rev-parse --verify HEAD > /dev/null &&
git update-index --refresh &&
git diff-files --quiet &&
! git diff-index --cached --quiet HEAD &&
. "$DOTEST"/author-script &&
export GIT_AUTHOR_NAME GIT_AUTHOR_NAME GIT_AUTHOR_DATE &&
git commit -F "$DOTEST"/message -e
require_clean_work_tree
do_rest
;;
--abort)
comment_for_reflog abort
test -d "$DOTEST" || die "No interactive rebase running"
HEADNAME=$(cat "$DOTEST"/head-name)
HEAD=$(cat "$DOTEST"/head)
git symbolic-ref HEAD $HEADNAME &&
output git reset --hard $HEAD &&
rm -rf "$DOTEST"
exit
;;
--skip)
comment_for_reflog skip
test -d "$DOTEST" || die "No interactive rebase running"
output git reset --hard && do_rest
;;
-s|--strategy)
shift
case "$#,$1" in
*,*=*)
STRATEGY="-s `expr "z$1" : 'z-[^=]*=\(.*\)'`" ;;
1,*)
usage ;;
*)
STRATEGY="-s $2"
shift ;;
esac
;;
--merge)
# we use merge anyway
;;
-C*)
die "Interactive rebase uses merge, so $1 does not make sense"
;;
-v|--verbose)
VERBOSE=t
;;
-p|--preserve-merges)
PRESERVE_MERGES=t
;;
-i|--interactive)
# yeah, we know
;;
''|-h)
usage
;;
*)
test -d "$DOTEST" &&
die "Interactive rebase already started"
git var GIT_COMMITTER_IDENT >/dev/null ||
die "You need to set your committer info first"
comment_for_reflog start
ONTO=
case "$1" in
--onto)
ONTO=$(git rev-parse --verify "$2") ||
die "Does not point to a valid commit: $2"
shift; shift
;;
esac
require_clean_work_tree
mkdir "$DOTEST" || die "Could not create temporary $DOTEST"
if test ! -z "$2"
then
output git show-ref --verify --quiet "refs/heads/$2" ||
die "Invalid branchname: $2"
output git checkout "$2" ||
die "Could not checkout $2"
fi
HEAD=$(git rev-parse --verify HEAD) || die "No HEAD?"
UPSTREAM=$(git rev-parse --verify "$1") || die "Invalid base"
test -z "$ONTO" && ONTO=$UPSTREAM
: > "$DOTEST"/interactive || die "Could not mark as interactive"
git symbolic-ref HEAD > "$DOTEST"/head-name ||
die "Could not get HEAD"
echo $HEAD > "$DOTEST"/head
echo $UPSTREAM > "$DOTEST"/upstream
echo $ONTO > "$DOTEST"/onto
test -z "$STRATEGY" || echo "$STRATEGY" > "$DOTEST"/strategy
test t = "$VERBOSE" && : > "$DOTEST"/verbose
if test t = "$PRESERVE_MERGES"
then
# $REWRITTEN contains files for each commit that is
# reachable by at least one merge base of $HEAD and
# $UPSTREAM. They are not necessarily rewritten, but
# their children might be.
# This ensures that commits on merged, but otherwise
# unrelated side branches are left alone. (Think "X"
# in the man page's example.)
mkdir "$REWRITTEN" &&
for c in $(git merge-base --all $HEAD $UPSTREAM)
do
echo $ONTO > "$REWRITTEN"/$c ||
die "Could not init rewritten commits"
done
MERGES_OPTION=
else
MERGES_OPTION=--no-merges
fi
SHORTUPSTREAM=$(git rev-parse --short $UPSTREAM)
SHORTHEAD=$(git rev-parse --short $HEAD)
SHORTONTO=$(git rev-parse --short $ONTO)
cat > "$TODO" << EOF
# Rebasing $SHORTUPSTREAM..$SHORTHEAD onto $SHORTONTO
#
# Commands:
# pick = use commit
# edit = use commit, but stop for amending
# squash = use commit, but meld into previous commit
#
# If you remove a line here THAT COMMIT WILL BE LOST.
#
EOF
git rev-list $MERGES_OPTION --pretty=oneline --abbrev-commit \
--abbrev=7 --reverse --left-right --cherry-pick \
$UPSTREAM...$HEAD | \
sed -n "s/^>/pick /p" >> "$TODO"
test -z "$(grep -ve '^$' -e '^#' < $TODO)" &&
die_abort "Nothing to do"
cp "$TODO" "$TODO".backup
git_editor "$TODO" ||
die "Could not execute editor"
test -z "$(grep -ve '^$' -e '^#' < $TODO)" &&
die_abort "Nothing to do"
output git checkout $ONTO && do_rest
esac
shift
done
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