Merge branch 'jk/maint-cvsimport-pathname' into maint
[git/gitweb.git] / git-rebase--interactive.sh
blob9b1e899e279e63cf3b952d910974ebf619d63bee
1 #!/bin/sh
3 # Copyright (c) 2006 Johannes E. Schindelin
5 # SHORT DESCRIPTION
7 # This script makes it easy to fix up commits in the middle of a series,
8 # and rearrange commits.
10 # The original idea comes from Eric W. Biederman, in
11 # http://article.gmane.org/gmane.comp.version-control.git/22407
13 OPTIONS_KEEPDASHDASH=
14 OPTIONS_SPEC="\
15 git-rebase [-i] [options] [--] <upstream> [<branch>]
16 git-rebase [-i] (--continue | --abort | --skip)
18 Available options are
19 v,verbose display a diffstat of what changed upstream
20 onto= rebase onto given branch instead of upstream
21 p,preserve-merges try to recreate merges instead of ignoring them
22 s,strategy= use the given merge strategy
23 m,merge always used (no-op)
24 i,interactive always used (no-op)
25 Actions:
26 continue continue rebasing process
27 abort abort rebasing process and restore original branch
28 skip skip current patch and continue rebasing process
29 no-verify override pre-rebase hook from stopping the operation
30 root rebase all reachable commmits up to the root(s)
33 . git-sh-setup
34 require_work_tree
36 DOTEST="$GIT_DIR/rebase-merge"
37 TODO="$DOTEST"/git-rebase-todo
38 DONE="$DOTEST"/done
39 MSG="$DOTEST"/message
40 SQUASH_MSG="$DOTEST"/message-squash
41 REWRITTEN="$DOTEST"/rewritten
42 DROPPED="$DOTEST"/dropped
43 PRESERVE_MERGES=
44 STRATEGY=
45 ONTO=
46 VERBOSE=
47 OK_TO_SKIP_PRE_REBASE=
48 REBASE_ROOT=
50 GIT_CHERRY_PICK_HELP=" After resolving the conflicts,
51 mark the corrected paths with 'git add <paths>', and
52 run 'git rebase --continue'"
53 export GIT_CHERRY_PICK_HELP
55 warn () {
56 echo "$*" >&2
59 output () {
60 case "$VERBOSE" in
61 '')
62 output=$("$@" 2>&1 )
63 status=$?
64 test $status != 0 && printf "%s\n" "$output"
65 return $status
68 "$@"
70 esac
73 run_pre_rebase_hook () {
74 if test -z "$OK_TO_SKIP_PRE_REBASE" &&
75 test -x "$GIT_DIR/hooks/pre-rebase"
76 then
77 "$GIT_DIR/hooks/pre-rebase" ${1+"$@"} || {
78 echo >&2 "The pre-rebase hook refused to rebase."
79 exit 1
84 require_clean_work_tree () {
85 # test if working tree is dirty
86 git rev-parse --verify HEAD > /dev/null &&
87 git update-index --ignore-submodules --refresh &&
88 git diff-files --quiet --ignore-submodules &&
89 git diff-index --cached --quiet HEAD --ignore-submodules -- ||
90 die "Working tree is dirty"
93 ORIG_REFLOG_ACTION="$GIT_REFLOG_ACTION"
95 comment_for_reflog () {
96 case "$ORIG_REFLOG_ACTION" in
97 ''|rebase*)
98 GIT_REFLOG_ACTION="rebase -i ($1)"
99 export GIT_REFLOG_ACTION
101 esac
104 last_count=
105 mark_action_done () {
106 sed -e 1q < "$TODO" >> "$DONE"
107 sed -e 1d < "$TODO" >> "$TODO".new
108 mv -f "$TODO".new "$TODO"
109 count=$(grep -c '^[^#]' < "$DONE")
110 total=$(($count+$(grep -c '^[^#]' < "$TODO")))
111 if test "$last_count" != "$count"
112 then
113 last_count=$count
114 printf "Rebasing (%d/%d)\r" $count $total
115 test -z "$VERBOSE" || echo
119 make_patch () {
120 sha1_and_parents="$(git rev-list --parents -1 "$1")"
121 case "$sha1_and_parents" in
122 ?*' '?*' '?*)
123 git diff --cc $sha1_and_parents
125 ?*' '?*)
126 git diff-tree -p "$1^!"
129 echo "Root commit"
131 esac > "$DOTEST"/patch
132 test -f "$DOTEST"/message ||
133 git cat-file commit "$1" | sed "1,/^$/d" > "$DOTEST"/message
134 test -f "$DOTEST"/author-script ||
135 get_author_ident_from_commit "$1" > "$DOTEST"/author-script
138 die_with_patch () {
139 make_patch "$1"
140 git rerere
141 die "$2"
144 die_abort () {
145 rm -rf "$DOTEST"
146 die "$1"
149 has_action () {
150 grep '^[^#]' "$1" >/dev/null
153 pick_one () {
154 no_ff=
155 case "$1" in -n) sha1=$2; no_ff=t ;; *) sha1=$1 ;; esac
156 output git rev-parse --verify $sha1 || die "Invalid commit name: $sha1"
157 test -d "$REWRITTEN" &&
158 pick_one_preserving_merges "$@" && return
159 if test ! -z "$REBASE_ROOT"
160 then
161 output git cherry-pick "$@"
162 return
164 parent_sha1=$(git rev-parse --verify $sha1^) ||
165 die "Could not get the parent of $sha1"
166 current_sha1=$(git rev-parse --verify HEAD)
167 if test "$no_ff$current_sha1" = "$parent_sha1"; then
168 output git reset --hard $sha1
169 test "a$1" = a-n && output git reset --soft $current_sha1
170 sha1=$(git rev-parse --short $sha1)
171 output warn Fast forward to $sha1
172 else
173 output git cherry-pick "$@"
177 pick_one_preserving_merges () {
178 fast_forward=t
179 case "$1" in
181 fast_forward=f
182 sha1=$2
185 sha1=$1
187 esac
188 sha1=$(git rev-parse $sha1)
190 if test -f "$DOTEST"/current-commit
191 then
192 if test "$fast_forward" = t
193 then
194 cat "$DOTEST"/current-commit | while read current_commit
196 git rev-parse HEAD > "$REWRITTEN"/$current_commit
197 done
198 rm "$DOTEST"/current-commit ||
199 die "Cannot write current commit's replacement sha1"
203 echo $sha1 >> "$DOTEST"/current-commit
205 # rewrite parents; if none were rewritten, we can fast-forward.
206 new_parents=
207 pend=" $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)"
208 if test "$pend" = " "
209 then
210 pend=" root"
212 while [ "$pend" != "" ]
214 p=$(expr "$pend" : ' \([^ ]*\)')
215 pend="${pend# $p}"
217 if test -f "$REWRITTEN"/$p
218 then
219 new_p=$(cat "$REWRITTEN"/$p)
221 # If the todo reordered commits, and our parent is marked for
222 # rewriting, but hasn't been gotten to yet, assume the user meant to
223 # drop it on top of the current HEAD
224 if test -z "$new_p"
225 then
226 new_p=$(git rev-parse HEAD)
229 test $p != $new_p && fast_forward=f
230 case "$new_parents" in
231 *$new_p*)
232 ;; # do nothing; that parent is already there
234 new_parents="$new_parents $new_p"
236 esac
237 else
238 if test -f "$DROPPED"/$p
239 then
240 fast_forward=f
241 replacement="$(cat "$DROPPED"/$p)"
242 test -z "$replacement" && replacement=root
243 pend=" $replacement$pend"
244 else
245 new_parents="$new_parents $p"
248 done
249 case $fast_forward in
251 output warn "Fast forward to $sha1"
252 output git reset --hard $sha1 ||
253 die "Cannot fast forward to $sha1"
256 first_parent=$(expr "$new_parents" : ' \([^ ]*\)')
258 if [ "$1" != "-n" ]
259 then
260 # detach HEAD to current parent
261 output git checkout $first_parent 2> /dev/null ||
262 die "Cannot move HEAD to $first_parent"
265 case "$new_parents" in
266 ' '*' '*)
267 test "a$1" = a-n && die "Refusing to squash a merge: $sha1"
269 # redo merge
270 author_script=$(get_author_ident_from_commit $sha1)
271 eval "$author_script"
272 msg="$(git cat-file commit $sha1 | sed -e '1,/^$/d')"
273 # No point in merging the first parent, that's HEAD
274 new_parents=${new_parents# $first_parent}
275 if ! GIT_AUTHOR_NAME="$GIT_AUTHOR_NAME" \
276 GIT_AUTHOR_EMAIL="$GIT_AUTHOR_EMAIL" \
277 GIT_AUTHOR_DATE="$GIT_AUTHOR_DATE" \
278 output git merge $STRATEGY -m "$msg" \
279 $new_parents
280 then
281 printf "%s\n" "$msg" > "$GIT_DIR"/MERGE_MSG
282 die_with_patch $sha1 "Error redoing merge $sha1"
286 output git cherry-pick "$@" ||
287 die_with_patch $sha1 "Could not pick $sha1"
289 esac
291 esac
294 nth_string () {
295 case "$1" in
296 *1[0-9]|*[04-9]) echo "$1"th;;
297 *1) echo "$1"st;;
298 *2) echo "$1"nd;;
299 *3) echo "$1"rd;;
300 esac
303 make_squash_message () {
304 if test -f "$SQUASH_MSG"; then
305 COUNT=$(($(sed -n "s/^# This is [^0-9]*\([1-9][0-9]*\).*/\1/p" \
306 < "$SQUASH_MSG" | sed -ne '$p')+1))
307 echo "# This is a combination of $COUNT commits."
308 sed -e 1d -e '2,/^./{
309 /^$/d
310 }' <"$SQUASH_MSG"
311 else
312 COUNT=2
313 echo "# This is a combination of two commits."
314 echo "# The first commit's message is:"
315 echo
316 git cat-file commit HEAD | sed -e '1,/^$/d'
318 echo
319 echo "# This is the $(nth_string $COUNT) commit message:"
320 echo
321 git cat-file commit $1 | sed -e '1,/^$/d'
324 peek_next_command () {
325 sed -n "1s/ .*$//p" < "$TODO"
328 do_next () {
329 rm -f "$DOTEST"/message "$DOTEST"/author-script \
330 "$DOTEST"/amend || exit
331 read command sha1 rest < "$TODO"
332 case "$command" in
333 '#'*|''|noop)
334 mark_action_done
336 pick|p)
337 comment_for_reflog pick
339 mark_action_done
340 pick_one $sha1 ||
341 die_with_patch $sha1 "Could not apply $sha1... $rest"
343 edit|e)
344 comment_for_reflog edit
346 mark_action_done
347 pick_one $sha1 ||
348 die_with_patch $sha1 "Could not apply $sha1... $rest"
349 make_patch $sha1
350 git rev-parse --verify HEAD > "$DOTEST"/amend
351 warn "Stopped at $sha1... $rest"
352 warn "You can amend the commit now, with"
353 warn
354 warn " git commit --amend"
355 warn
356 warn "Once you are satisfied with your changes, run"
357 warn
358 warn " git rebase --continue"
359 warn
360 exit 0
362 squash|s)
363 comment_for_reflog squash
365 test -f "$DONE" && has_action "$DONE" ||
366 die "Cannot 'squash' without a previous commit"
368 mark_action_done
369 make_squash_message $sha1 > "$MSG"
370 failed=f
371 author_script=$(get_author_ident_from_commit HEAD)
372 output git reset --soft HEAD^
373 pick_one -n $sha1 || failed=t
374 case "$(peek_next_command)" in
375 squash|s)
376 USE_OUTPUT=output
377 MSG_OPT=-F
378 EDIT_OR_FILE="$MSG"
379 cp "$MSG" "$SQUASH_MSG"
382 USE_OUTPUT=
383 MSG_OPT=
384 EDIT_OR_FILE=-e
385 rm -f "$SQUASH_MSG" || exit
386 cp "$MSG" "$GIT_DIR"/SQUASH_MSG
387 rm -f "$GIT_DIR"/MERGE_MSG || exit
389 esac
390 echo "$author_script" > "$DOTEST"/author-script
391 if test $failed = f
392 then
393 # This is like --amend, but with a different message
394 eval "$author_script"
395 GIT_AUTHOR_NAME="$GIT_AUTHOR_NAME" \
396 GIT_AUTHOR_EMAIL="$GIT_AUTHOR_EMAIL" \
397 GIT_AUTHOR_DATE="$GIT_AUTHOR_DATE" \
398 $USE_OUTPUT git commit --no-verify \
399 $MSG_OPT "$EDIT_OR_FILE" || failed=t
401 if test $failed = t
402 then
403 cp "$MSG" "$GIT_DIR"/MERGE_MSG
404 warn
405 warn "Could not apply $sha1... $rest"
406 die_with_patch $sha1 ""
410 warn "Unknown command: $command $sha1 $rest"
411 if git rev-parse --verify -q "$sha1" >/dev/null
412 then
413 die_with_patch $sha1 "Please fix this in the file $TODO."
414 else
415 die "Please fix this in the file $TODO."
418 esac
419 test -s "$TODO" && return
421 comment_for_reflog finish &&
422 HEADNAME=$(cat "$DOTEST"/head-name) &&
423 OLDHEAD=$(cat "$DOTEST"/head) &&
424 SHORTONTO=$(git rev-parse --short $(cat "$DOTEST"/onto)) &&
425 NEWHEAD=$(git rev-parse HEAD) &&
426 case $HEADNAME in
427 refs/*)
428 message="$GIT_REFLOG_ACTION: $HEADNAME onto $SHORTONTO" &&
429 git update-ref -m "$message" $HEADNAME $NEWHEAD $OLDHEAD &&
430 git symbolic-ref HEAD $HEADNAME
432 esac && {
433 test ! -f "$DOTEST"/verbose ||
434 git diff-tree --stat $(cat "$DOTEST"/head)..HEAD
435 } &&
436 rm -rf "$DOTEST" &&
437 git gc --auto &&
438 warn "Successfully rebased and updated $HEADNAME."
440 exit
443 do_rest () {
444 while :
446 do_next
447 done
450 # skip picking commits whose parents are unchanged
451 skip_unnecessary_picks () {
452 fd=3
453 while read command sha1 rest
455 # fd=3 means we skip the command
456 case "$fd,$command,$(git rev-parse --verify --quiet $sha1^)" in
457 3,pick,"$ONTO"*|3,p,"$ONTO"*)
458 # pick a commit whose parent is current $ONTO -> skip
459 ONTO=$sha1
461 3,#*|3,,*)
462 # copy comments
465 fd=1
467 esac
468 echo "$command${sha1:+ }$sha1${rest:+ }$rest" >&$fd
469 done <"$TODO" >"$TODO.new" 3>>"$DONE" &&
470 mv -f "$TODO".new "$TODO" ||
471 die "Could not skip unnecessary pick commands"
474 # check if no other options are set
475 is_standalone () {
476 test $# -eq 2 -a "$2" = '--' &&
477 test -z "$ONTO" &&
478 test -z "$PRESERVE_MERGES" &&
479 test -z "$STRATEGY" &&
480 test -z "$VERBOSE"
483 get_saved_options () {
484 test -d "$REWRITTEN" && PRESERVE_MERGES=t
485 test -f "$DOTEST"/strategy && STRATEGY="$(cat "$DOTEST"/strategy)"
486 test -f "$DOTEST"/verbose && VERBOSE=t
487 test -f "$DOTEST"/rebase-root && REBASE_ROOT=t
490 while test $# != 0
492 case "$1" in
493 --no-verify)
494 OK_TO_SKIP_PRE_REBASE=yes
496 --verify)
498 --continue)
499 is_standalone "$@" || usage
500 get_saved_options
501 comment_for_reflog continue
503 test -d "$DOTEST" || die "No interactive rebase running"
505 # Sanity check
506 git rev-parse --verify HEAD >/dev/null ||
507 die "Cannot read HEAD"
508 git update-index --ignore-submodules --refresh &&
509 git diff-files --quiet --ignore-submodules ||
510 die "Working tree is dirty"
512 # do we have anything to commit?
513 if git diff-index --cached --quiet --ignore-submodules HEAD --
514 then
515 : Nothing to commit -- skip this
516 else
517 . "$DOTEST"/author-script ||
518 die "Cannot find the author identity"
519 amend=
520 if test -f "$DOTEST"/amend
521 then
522 amend=$(git rev-parse --verify HEAD)
523 test "$amend" = $(cat "$DOTEST"/amend) ||
524 die "\
525 You have uncommitted changes in your working tree. Please, commit them
526 first and then run 'git rebase --continue' again."
527 git reset --soft HEAD^ ||
528 die "Cannot rewind the HEAD"
530 export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_AUTHOR_DATE &&
531 git commit --no-verify -F "$DOTEST"/message -e || {
532 test -n "$amend" && git reset --soft $amend
533 die "Could not commit staged changes."
537 require_clean_work_tree
538 do_rest
540 --abort)
541 is_standalone "$@" || usage
542 get_saved_options
543 comment_for_reflog abort
545 git rerere clear
546 test -d "$DOTEST" || die "No interactive rebase running"
548 HEADNAME=$(cat "$DOTEST"/head-name)
549 HEAD=$(cat "$DOTEST"/head)
550 case $HEADNAME in
551 refs/*)
552 git symbolic-ref HEAD $HEADNAME
554 esac &&
555 output git reset --hard $HEAD &&
556 rm -rf "$DOTEST"
557 exit
559 --skip)
560 is_standalone "$@" || usage
561 get_saved_options
562 comment_for_reflog skip
564 git rerere clear
565 test -d "$DOTEST" || die "No interactive rebase running"
567 output git reset --hard && do_rest
570 case "$#,$1" in
571 *,*=*)
572 STRATEGY="-s "$(expr "z$1" : 'z-[^=]*=\(.*\)') ;;
573 1,*)
574 usage ;;
576 STRATEGY="-s $2"
577 shift ;;
578 esac
581 # we use merge anyway
584 VERBOSE=t
587 PRESERVE_MERGES=t
590 # yeah, we know
592 --root)
593 REBASE_ROOT=t
595 --onto)
596 shift
597 ONTO=$(git rev-parse --verify "$1") ||
598 die "Does not point to a valid commit: $1"
601 shift
602 test -z "$REBASE_ROOT" -a $# -ge 1 -a $# -le 2 ||
603 test ! -z "$REBASE_ROOT" -a $# -le 1 || usage
604 test -d "$DOTEST" &&
605 die "Interactive rebase already started"
607 git var GIT_COMMITTER_IDENT >/dev/null ||
608 die "You need to set your committer info first"
610 if test -z "$REBASE_ROOT"
611 then
612 UPSTREAM_ARG="$1"
613 UPSTREAM=$(git rev-parse --verify "$1") || die "Invalid base"
614 test -z "$ONTO" && ONTO=$UPSTREAM
615 shift
616 else
617 UPSTREAM=
618 UPSTREAM_ARG=--root
619 test -z "$ONTO" &&
620 die "You must specify --onto when using --root"
622 run_pre_rebase_hook "$UPSTREAM_ARG" "$@"
624 comment_for_reflog start
626 require_clean_work_tree
628 if test ! -z "$1"
629 then
630 output git show-ref --verify --quiet "refs/heads/$1" ||
631 die "Invalid branchname: $1"
632 output git checkout "$1" ||
633 die "Could not checkout $1"
636 HEAD=$(git rev-parse --verify HEAD) || die "No HEAD?"
637 mkdir "$DOTEST" || die "Could not create temporary $DOTEST"
639 : > "$DOTEST"/interactive || die "Could not mark as interactive"
640 git symbolic-ref HEAD > "$DOTEST"/head-name 2> /dev/null ||
641 echo "detached HEAD" > "$DOTEST"/head-name
643 echo $HEAD > "$DOTEST"/head
644 case "$REBASE_ROOT" in
646 rm -f "$DOTEST"/rebase-root ;;
648 : >"$DOTEST"/rebase-root ;;
649 esac
650 echo $ONTO > "$DOTEST"/onto
651 test -z "$STRATEGY" || echo "$STRATEGY" > "$DOTEST"/strategy
652 test t = "$VERBOSE" && : > "$DOTEST"/verbose
653 if test t = "$PRESERVE_MERGES"
654 then
655 # $REWRITTEN contains files for each commit that is
656 # reachable by at least one merge base of $HEAD and
657 # $UPSTREAM. They are not necessarily rewritten, but
658 # their children might be.
659 # This ensures that commits on merged, but otherwise
660 # unrelated side branches are left alone. (Think "X"
661 # in the man page's example.)
662 if test -z "$REBASE_ROOT"
663 then
664 mkdir "$REWRITTEN" &&
665 for c in $(git merge-base --all $HEAD $UPSTREAM)
667 echo $ONTO > "$REWRITTEN"/$c ||
668 die "Could not init rewritten commits"
669 done
670 else
671 mkdir "$REWRITTEN" &&
672 echo $ONTO > "$REWRITTEN"/root ||
673 die "Could not init rewritten commits"
675 # No cherry-pick because our first pass is to determine
676 # parents to rewrite and skipping dropped commits would
677 # prematurely end our probe
678 MERGES_OPTION=
679 first_after_upstream="$(git rev-list --reverse --first-parent $UPSTREAM..$HEAD | head -n 1)"
680 else
681 MERGES_OPTION="--no-merges --cherry-pick"
684 SHORTHEAD=$(git rev-parse --short $HEAD)
685 SHORTONTO=$(git rev-parse --short $ONTO)
686 if test -z "$REBASE_ROOT"
687 # this is now equivalent to ! -z "$UPSTREAM"
688 then
689 SHORTUPSTREAM=$(git rev-parse --short $UPSTREAM)
690 REVISIONS=$UPSTREAM...$HEAD
691 SHORTREVISIONS=$SHORTUPSTREAM..$SHORTHEAD
692 else
693 REVISIONS=$ONTO...$HEAD
694 SHORTREVISIONS=$SHORTHEAD
696 git rev-list $MERGES_OPTION --pretty=oneline --abbrev-commit \
697 --abbrev=7 --reverse --left-right --topo-order \
698 $REVISIONS | \
699 sed -n "s/^>//p" | while read shortsha1 rest
701 if test t != "$PRESERVE_MERGES"
702 then
703 echo "pick $shortsha1 $rest" >> "$TODO"
704 else
705 sha1=$(git rev-parse $shortsha1)
706 if test -z "$REBASE_ROOT"
707 then
708 preserve=t
709 for p in $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)
711 if test -f "$REWRITTEN"/$p -a \( $p != $ONTO -o $sha1 = $first_after_upstream \)
712 then
713 preserve=f
715 done
716 else
717 preserve=f
719 if test f = "$preserve"
720 then
721 touch "$REWRITTEN"/$sha1
722 echo "pick $shortsha1 $rest" >> "$TODO"
725 done
727 # Watch for commits that been dropped by --cherry-pick
728 if test t = "$PRESERVE_MERGES"
729 then
730 mkdir "$DROPPED"
731 # Save all non-cherry-picked changes
732 git rev-list $REVISIONS --left-right --cherry-pick | \
733 sed -n "s/^>//p" > "$DOTEST"/not-cherry-picks
734 # Now all commits and note which ones are missing in
735 # not-cherry-picks and hence being dropped
736 git rev-list $REVISIONS |
737 while read rev
739 if test -f "$REWRITTEN"/$rev -a "$(grep "$rev" "$DOTEST"/not-cherry-picks)" = ""
740 then
741 # Use -f2 because if rev-list is telling us this commit is
742 # not worthwhile, we don't want to track its multiple heads,
743 # just the history of its first-parent for others that will
744 # be rebasing on top of it
745 git rev-list --parents -1 $rev | cut -d' ' -s -f2 > "$DROPPED"/$rev
746 short=$(git rev-list -1 --abbrev-commit --abbrev=7 $rev)
747 grep -v "^[a-z][a-z]* $short" <"$TODO" > "${TODO}2" ; mv "${TODO}2" "$TODO"
748 rm "$REWRITTEN"/$rev
750 done
753 test -s "$TODO" || echo noop >> "$TODO"
754 cat >> "$TODO" << EOF
756 # Rebase $SHORTREVISIONS onto $SHORTONTO
758 # Commands:
759 # p, pick = use commit
760 # e, edit = use commit, but stop for amending
761 # s, squash = use commit, but meld into previous commit
763 # If you remove a line here THAT COMMIT WILL BE LOST.
764 # However, if you remove everything, the rebase will be aborted.
768 has_action "$TODO" ||
769 die_abort "Nothing to do"
771 cp "$TODO" "$TODO".backup
772 git_editor "$TODO" ||
773 die "Could not execute editor"
775 has_action "$TODO" ||
776 die_abort "Nothing to do"
778 test -d "$REWRITTEN" || skip_unnecessary_picks
780 git update-ref ORIG_HEAD $HEAD
781 output git checkout $ONTO && do_rest
783 esac
784 shift
785 done