d8c3c9aac9ecfcc34aac151760520a961f63ce91
1 #!/bin/sh
2 #
3 # Copyright (c) 2006 Johannes E. Schindelin
5 # SHORT DESCRIPTION
6 #
7 # This script makes it easy to fix up commits in the middle of a series,
8 # and rearrange commits.
9 #
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)
17 --
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)
31 "
33 . git-sh-setup
34 require_work_tree
36 DOTEST="$GIT_DIR/rebase-merge"
38 # The file containing rebase commands, comments, and empty lines.
39 # This file is created by "git rebase -i" then edited by the user. As
40 # the lines are processed, they are removed from the front of this
41 # file and written to the tail of $DONE.
42 TODO="$DOTEST"/git-rebase-todo
44 # The rebase command lines that have already been processed. A line
45 # is moved here when it is first handled, before any associated user
46 # actions.
47 DONE="$DOTEST"/done
49 # The commit message that is planned to be used for any changes that
50 # need to be committed following a user interaction.
51 MSG="$DOTEST"/message
53 # The file into which is accumulated the suggested commit message for
54 # squash/fixup commands. When the first of a series of squash/fixups
55 # is seen, the file is created and the commit message from the
56 # previous commit and from the first squash/fixup commit are written
57 # to it. The commit message for each subsequent squash/fixup commit
58 # is appended to the file as it is processed.
59 #
60 # The first line of the file is of the form
61 # # This is a combination of $COUNT commits.
62 # where $COUNT is the number of commits whose messages have been
63 # written to the file so far (including the initial "pick" commit).
64 # Each time that a commit message is processed, this line is read and
65 # updated. It is deleted just before the combined commit is made.
66 SQUASH_MSG="$DOTEST"/message-squash
68 # $REWRITTEN is the name of a directory containing files for each
69 # commit that is reachable by at least one merge base of $HEAD and
70 # $UPSTREAM. They are not necessarily rewritten, but their children
71 # might be. This ensures that commits on merged, but otherwise
72 # unrelated side branches are left alone. (Think "X" in the man page's
73 # example.)
74 REWRITTEN="$DOTEST"/rewritten
76 DROPPED="$DOTEST"/dropped
78 # A script to set the GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, and
79 # GIT_AUTHOR_DATE that will be used for the commit that is currently
80 # being rebased.
81 AUTHOR_SCRIPT="$DOTEST"/author-script
83 # When an "edit" rebase command is being processed, the SHA1 of the
84 # commit to be edited is recorded in this file. When "git rebase
85 # --continue" is executed, if there are any staged changes then they
86 # will be amended to the HEAD commit, but only provided the HEAD
87 # commit is still the commit to be edited. When any other rebase
88 # command is processed, this file is deleted.
89 AMEND="$DOTEST"/amend
91 PRESERVE_MERGES=
92 STRATEGY=
93 ONTO=
94 VERBOSE=
95 OK_TO_SKIP_PRE_REBASE=
96 REBASE_ROOT=
98 GIT_CHERRY_PICK_HELP=" After resolving the conflicts,
99 mark the corrected paths with 'git add <paths>', and
100 run 'git rebase --continue'"
101 export GIT_CHERRY_PICK_HELP
103 warn () {
104 echo "$*" >&2
105 }
107 output () {
108 case "$VERBOSE" in
109 '')
110 output=$("$@" 2>&1 )
111 status=$?
112 test $status != 0 && printf "%s\n" "$output"
113 return $status
114 ;;
115 *)
116 "$@"
117 ;;
118 esac
119 }
121 # Output the commit message for the specified commit.
122 commit_message () {
123 git cat-file commit "$1" | sed "1,/^$/d"
124 }
126 run_pre_rebase_hook () {
127 if test -z "$OK_TO_SKIP_PRE_REBASE" &&
128 test -x "$GIT_DIR/hooks/pre-rebase"
129 then
130 "$GIT_DIR/hooks/pre-rebase" ${1+"$@"} || {
131 echo >&2 "The pre-rebase hook refused to rebase."
132 exit 1
133 }
134 fi
135 }
137 require_clean_work_tree () {
138 # test if working tree is dirty
139 git rev-parse --verify HEAD > /dev/null &&
140 git update-index --ignore-submodules --refresh &&
141 git diff-files --quiet --ignore-submodules &&
142 git diff-index --cached --quiet HEAD --ignore-submodules -- ||
143 die "Working tree is dirty"
144 }
146 ORIG_REFLOG_ACTION="$GIT_REFLOG_ACTION"
148 comment_for_reflog () {
149 case "$ORIG_REFLOG_ACTION" in
150 ''|rebase*)
151 GIT_REFLOG_ACTION="rebase -i ($1)"
152 export GIT_REFLOG_ACTION
153 ;;
154 esac
155 }
157 last_count=
158 mark_action_done () {
159 sed -e 1q < "$TODO" >> "$DONE"
160 sed -e 1d < "$TODO" >> "$TODO".new
161 mv -f "$TODO".new "$TODO"
162 count=$(sane_grep -c '^[^#]' < "$DONE")
163 total=$(($count+$(sane_grep -c '^[^#]' < "$TODO")))
164 if test "$last_count" != "$count"
165 then
166 last_count=$count
167 printf "Rebasing (%d/%d)\r" $count $total
168 test -z "$VERBOSE" || echo
169 fi
170 }
172 make_patch () {
173 sha1_and_parents="$(git rev-list --parents -1 "$1")"
174 case "$sha1_and_parents" in
175 ?*' '?*' '?*)
176 git diff --cc $sha1_and_parents
177 ;;
178 ?*' '?*)
179 git diff-tree -p "$1^!"
180 ;;
181 *)
182 echo "Root commit"
183 ;;
184 esac > "$DOTEST"/patch
185 test -f "$MSG" ||
186 commit_message "$1" > "$MSG"
187 test -f "$AUTHOR_SCRIPT" ||
188 get_author_ident_from_commit "$1" > "$AUTHOR_SCRIPT"
189 }
191 die_with_patch () {
192 make_patch "$1"
193 git rerere
194 die "$2"
195 }
197 die_abort () {
198 rm -rf "$DOTEST"
199 die "$1"
200 }
202 has_action () {
203 sane_grep '^[^#]' "$1" >/dev/null
204 }
206 # Run command with GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, and
207 # GIT_AUTHOR_DATE exported from the current environment.
208 do_with_author () {
209 GIT_AUTHOR_NAME="$GIT_AUTHOR_NAME" \
210 GIT_AUTHOR_EMAIL="$GIT_AUTHOR_EMAIL" \
211 GIT_AUTHOR_DATE="$GIT_AUTHOR_DATE" \
212 "$@"
213 }
215 pick_one () {
216 no_ff=
217 case "$1" in -n) sha1=$2; no_ff=t ;; *) sha1=$1 ;; esac
218 output git rev-parse --verify $sha1 || die "Invalid commit name: $sha1"
219 test -d "$REWRITTEN" &&
220 pick_one_preserving_merges "$@" && return
221 if test -n "$REBASE_ROOT"
222 then
223 output git cherry-pick "$@"
224 return
225 fi
226 parent_sha1=$(git rev-parse --verify $sha1^) ||
227 die "Could not get the parent of $sha1"
228 current_sha1=$(git rev-parse --verify HEAD)
229 if test -z "$no_ff" -a "$current_sha1" = "$parent_sha1"
230 then
231 output git reset --hard $sha1
232 output warn Fast-forward to $(git rev-parse --short $sha1)
233 else
234 output git cherry-pick "$@"
235 fi
236 }
238 pick_one_preserving_merges () {
239 fast_forward=t
240 case "$1" in
241 -n)
242 fast_forward=f
243 sha1=$2
244 ;;
245 *)
246 sha1=$1
247 ;;
248 esac
249 sha1=$(git rev-parse $sha1)
251 if test -f "$DOTEST"/current-commit
252 then
253 if test "$fast_forward" = t
254 then
255 cat "$DOTEST"/current-commit | while read current_commit
256 do
257 git rev-parse HEAD > "$REWRITTEN"/$current_commit
258 done
259 rm "$DOTEST"/current-commit ||
260 die "Cannot write current commit's replacement sha1"
261 fi
262 fi
264 echo $sha1 >> "$DOTEST"/current-commit
266 # rewrite parents; if none were rewritten, we can fast-forward.
267 new_parents=
268 pend=" $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)"
269 if test "$pend" = " "
270 then
271 pend=" root"
272 fi
273 while [ "$pend" != "" ]
274 do
275 p=$(expr "$pend" : ' \([^ ]*\)')
276 pend="${pend# $p}"
278 if test -f "$REWRITTEN"/$p
279 then
280 new_p=$(cat "$REWRITTEN"/$p)
282 # If the todo reordered commits, and our parent is marked for
283 # rewriting, but hasn't been gotten to yet, assume the user meant to
284 # drop it on top of the current HEAD
285 if test -z "$new_p"
286 then
287 new_p=$(git rev-parse HEAD)
288 fi
290 test $p != $new_p && fast_forward=f
291 case "$new_parents" in
292 *$new_p*)
293 ;; # do nothing; that parent is already there
294 *)
295 new_parents="$new_parents $new_p"
296 ;;
297 esac
298 else
299 if test -f "$DROPPED"/$p
300 then
301 fast_forward=f
302 replacement="$(cat "$DROPPED"/$p)"
303 test -z "$replacement" && replacement=root
304 pend=" $replacement$pend"
305 else
306 new_parents="$new_parents $p"
307 fi
308 fi
309 done
310 case $fast_forward in
311 t)
312 output warn "Fast-forward to $sha1"
313 output git reset --hard $sha1 ||
314 die "Cannot fast-forward to $sha1"
315 ;;
316 f)
317 first_parent=$(expr "$new_parents" : ' \([^ ]*\)')
319 if [ "$1" != "-n" ]
320 then
321 # detach HEAD to current parent
322 output git checkout $first_parent 2> /dev/null ||
323 die "Cannot move HEAD to $first_parent"
324 fi
326 case "$new_parents" in
327 ' '*' '*)
328 test "a$1" = a-n && die "Refusing to squash a merge: $sha1"
330 # redo merge
331 author_script=$(get_author_ident_from_commit $sha1)
332 eval "$author_script"
333 msg="$(commit_message $sha1)"
334 # No point in merging the first parent, that's HEAD
335 new_parents=${new_parents# $first_parent}
336 if ! do_with_author output \
337 git merge $STRATEGY -m "$msg" $new_parents
338 then
339 printf "%s\n" "$msg" > "$GIT_DIR"/MERGE_MSG
340 die_with_patch $sha1 "Error redoing merge $sha1"
341 fi
342 ;;
343 *)
344 output git cherry-pick "$@" ||
345 die_with_patch $sha1 "Could not pick $sha1"
346 ;;
347 esac
348 ;;
349 esac
350 }
352 nth_string () {
353 case "$1" in
354 *1[0-9]|*[04-9]) echo "$1"th;;
355 *1) echo "$1"st;;
356 *2) echo "$1"nd;;
357 *3) echo "$1"rd;;
358 esac
359 }
361 update_squash_message () {
362 if test -f "$SQUASH_MSG"; then
363 mv "$SQUASH_MSG" "$SQUASH_MSG".bak || exit
364 COUNT=$(($(sed -n \
365 -e "1s/^# This is a combination of \(.*\) commits\./\1/p" \
366 -e "q" < "$SQUASH_MSG".bak)+1))
367 {
368 echo "# This is a combination of $COUNT commits."
369 sed -e 1d -e '2,/^./{
370 /^$/d
371 }' <"$SQUASH_MSG".bak
372 } >$SQUASH_MSG
373 else
374 COUNT=2
375 {
376 echo "# This is a combination of 2 commits."
377 echo "# The first commit's message is:"
378 echo
379 commit_message HEAD
380 } >$SQUASH_MSG
381 fi
382 case $1 in
383 squash)
384 echo
385 echo "# This is the $(nth_string $COUNT) commit message:"
386 echo
387 commit_message $2
388 ;;
389 fixup)
390 echo
391 echo "# The $(nth_string $COUNT) commit message will be skipped:"
392 echo
393 commit_message $2 | sed -e 's/^/# /'
394 ;;
395 esac >>$SQUASH_MSG
396 }
398 peek_next_command () {
399 sed -n -e "/^#/d" -e "/^$/d" -e "s/ .*//p" -e "q" < "$TODO"
400 }
402 do_next () {
403 rm -f "$MSG" "$AUTHOR_SCRIPT" "$AMEND" || exit
404 read command sha1 rest < "$TODO"
405 case "$command" in
406 '#'*|''|noop)
407 mark_action_done
408 ;;
409 pick|p)
410 comment_for_reflog pick
412 mark_action_done
413 pick_one $sha1 ||
414 die_with_patch $sha1 "Could not apply $sha1... $rest"
415 ;;
416 reword|r)
417 comment_for_reflog reword
419 mark_action_done
420 pick_one $sha1 ||
421 die_with_patch $sha1 "Could not apply $sha1... $rest"
422 git commit --amend
423 ;;
424 edit|e)
425 comment_for_reflog edit
427 mark_action_done
428 pick_one $sha1 ||
429 die_with_patch $sha1 "Could not apply $sha1... $rest"
430 make_patch $sha1
431 git rev-parse --verify HEAD > "$AMEND"
432 warn "Stopped at $sha1... $rest"
433 warn "You can amend the commit now, with"
434 warn
435 warn " git commit --amend"
436 warn
437 warn "Once you are satisfied with your changes, run"
438 warn
439 warn " git rebase --continue"
440 warn
441 exit 0
442 ;;
443 squash|s|fixup|f)
444 case "$command" in
445 squash|s)
446 squash_style=squash
447 ;;
448 fixup|f)
449 squash_style=fixup
450 ;;
451 esac
452 comment_for_reflog $squash_style
454 test -f "$DONE" && has_action "$DONE" ||
455 die "Cannot '$squash_style' without a previous commit"
457 mark_action_done
458 update_squash_message $squash_style $sha1
459 failed=f
460 author_script=$(get_author_ident_from_commit HEAD)
461 echo "$author_script" > "$AUTHOR_SCRIPT"
462 eval "$author_script"
463 output git reset --soft HEAD^
464 pick_one -n $sha1 || failed=t
465 case "$(peek_next_command)" in
466 squash|s|fixup|f)
467 USE_OUTPUT=output
468 cp "$SQUASH_MSG" "$MSG" || exit
469 MSG_OPT=-F
470 EDIT_OR_FILE="$MSG"
471 ;;
472 *)
473 USE_OUTPUT=
474 MSG_OPT=
475 EDIT_OR_FILE=-e
476 cp "$SQUASH_MSG" "$MSG" || exit
477 mv "$SQUASH_MSG" "$GIT_DIR"/SQUASH_MSG || exit
478 rm -f "$GIT_DIR"/MERGE_MSG || exit
479 ;;
480 esac
481 if test $failed = f
482 then
483 # This is like --amend, but with a different message
484 do_with_author $USE_OUTPUT git commit --no-verify \
485 $MSG_OPT "$EDIT_OR_FILE" ||
486 failed=t
487 fi
488 if test $failed = t
489 then
490 cp "$MSG" "$GIT_DIR"/MERGE_MSG
491 warn
492 warn "Could not apply $sha1... $rest"
493 die_with_patch $sha1 ""
494 fi
495 ;;
496 *)
497 warn "Unknown command: $command $sha1 $rest"
498 if git rev-parse --verify -q "$sha1" >/dev/null
499 then
500 die_with_patch $sha1 "Please fix this in the file $TODO."
501 else
502 die "Please fix this in the file $TODO."
503 fi
504 ;;
505 esac
506 test -s "$TODO" && return
508 comment_for_reflog finish &&
509 HEADNAME=$(cat "$DOTEST"/head-name) &&
510 OLDHEAD=$(cat "$DOTEST"/head) &&
511 SHORTONTO=$(git rev-parse --short $(cat "$DOTEST"/onto)) &&
512 NEWHEAD=$(git rev-parse HEAD) &&
513 case $HEADNAME in
514 refs/*)
515 message="$GIT_REFLOG_ACTION: $HEADNAME onto $SHORTONTO" &&
516 git update-ref -m "$message" $HEADNAME $NEWHEAD $OLDHEAD &&
517 git symbolic-ref HEAD $HEADNAME
518 ;;
519 esac && {
520 test ! -f "$DOTEST"/verbose ||
521 git diff-tree --stat $(cat "$DOTEST"/head)..HEAD
522 } &&
523 rm -rf "$DOTEST" &&
524 git gc --auto &&
525 warn "Successfully rebased and updated $HEADNAME."
527 exit
528 }
530 do_rest () {
531 while :
532 do
533 do_next
534 done
535 }
537 # skip picking commits whose parents are unchanged
538 skip_unnecessary_picks () {
539 fd=3
540 while read command sha1 rest
541 do
542 # fd=3 means we skip the command
543 case "$fd,$command,$(git rev-parse --verify --quiet $sha1^)" in
544 3,pick,"$ONTO"*|3,p,"$ONTO"*)
545 # pick a commit whose parent is current $ONTO -> skip
546 ONTO=$sha1
547 ;;
548 3,#*|3,,*)
549 # copy comments
550 ;;
551 *)
552 fd=1
553 ;;
554 esac
555 echo "$command${sha1:+ }$sha1${rest:+ }$rest" >&$fd
556 done <"$TODO" >"$TODO.new" 3>>"$DONE" &&
557 mv -f "$TODO".new "$TODO" ||
558 die "Could not skip unnecessary pick commands"
559 }
561 # check if no other options are set
562 is_standalone () {
563 test $# -eq 2 -a "$2" = '--' &&
564 test -z "$ONTO" &&
565 test -z "$PRESERVE_MERGES" &&
566 test -z "$STRATEGY" &&
567 test -z "$VERBOSE"
568 }
570 get_saved_options () {
571 test -d "$REWRITTEN" && PRESERVE_MERGES=t
572 test -f "$DOTEST"/strategy && STRATEGY="$(cat "$DOTEST"/strategy)"
573 test -f "$DOTEST"/verbose && VERBOSE=t
574 test -f "$DOTEST"/rebase-root && REBASE_ROOT=t
575 }
577 while test $# != 0
578 do
579 case "$1" in
580 --no-verify)
581 OK_TO_SKIP_PRE_REBASE=yes
582 ;;
583 --verify)
584 ;;
585 --continue)
586 is_standalone "$@" || usage
587 get_saved_options
588 comment_for_reflog continue
590 test -d "$DOTEST" || die "No interactive rebase running"
592 # Sanity check
593 git rev-parse --verify HEAD >/dev/null ||
594 die "Cannot read HEAD"
595 git update-index --ignore-submodules --refresh &&
596 git diff-files --quiet --ignore-submodules ||
597 die "Working tree is dirty"
599 # do we have anything to commit?
600 if git diff-index --cached --quiet --ignore-submodules HEAD --
601 then
602 : Nothing to commit -- skip this
603 else
604 . "$AUTHOR_SCRIPT" ||
605 die "Cannot find the author identity"
606 amend=
607 if test -f "$AMEND"
608 then
609 amend=$(git rev-parse --verify HEAD)
610 test "$amend" = $(cat "$AMEND") ||
611 die "\
612 You have uncommitted changes in your working tree. Please, commit them
613 first and then run 'git rebase --continue' again."
614 git reset --soft HEAD^ ||
615 die "Cannot rewind the HEAD"
616 fi
617 do_with_author git commit --no-verify -F "$MSG" -e || {
618 test -n "$amend" && git reset --soft $amend
619 die "Could not commit staged changes."
620 }
621 fi
623 require_clean_work_tree
624 do_rest
625 ;;
626 --abort)
627 is_standalone "$@" || usage
628 get_saved_options
629 comment_for_reflog abort
631 git rerere clear
632 test -d "$DOTEST" || die "No interactive rebase running"
634 HEADNAME=$(cat "$DOTEST"/head-name)
635 HEAD=$(cat "$DOTEST"/head)
636 case $HEADNAME in
637 refs/*)
638 git symbolic-ref HEAD $HEADNAME
639 ;;
640 esac &&
641 output git reset --hard $HEAD &&
642 rm -rf "$DOTEST"
643 exit
644 ;;
645 --skip)
646 is_standalone "$@" || usage
647 get_saved_options
648 comment_for_reflog skip
650 git rerere clear
651 test -d "$DOTEST" || die "No interactive rebase running"
653 output git reset --hard && do_rest
654 ;;
655 -s)
656 case "$#,$1" in
657 *,*=*)
658 STRATEGY="-s "$(expr "z$1" : 'z-[^=]*=\(.*\)') ;;
659 1,*)
660 usage ;;
661 *)
662 STRATEGY="-s $2"
663 shift ;;
664 esac
665 ;;
666 -m)
667 # we use merge anyway
668 ;;
669 -v)
670 VERBOSE=t
671 ;;
672 -p)
673 PRESERVE_MERGES=t
674 ;;
675 -i)
676 # yeah, we know
677 ;;
678 --root)
679 REBASE_ROOT=t
680 ;;
681 --onto)
682 shift
683 ONTO=$(git rev-parse --verify "$1") ||
684 die "Does not point to a valid commit: $1"
685 ;;
686 --)
687 shift
688 test -z "$REBASE_ROOT" -a $# -ge 1 -a $# -le 2 ||
689 test ! -z "$REBASE_ROOT" -a $# -le 1 || usage
690 test -d "$DOTEST" &&
691 die "Interactive rebase already started"
693 git var GIT_COMMITTER_IDENT >/dev/null ||
694 die "You need to set your committer info first"
696 if test -z "$REBASE_ROOT"
697 then
698 UPSTREAM_ARG="$1"
699 UPSTREAM=$(git rev-parse --verify "$1") || die "Invalid base"
700 test -z "$ONTO" && ONTO=$UPSTREAM
701 shift
702 else
703 UPSTREAM=
704 UPSTREAM_ARG=--root
705 test -z "$ONTO" &&
706 die "You must specify --onto when using --root"
707 fi
708 run_pre_rebase_hook "$UPSTREAM_ARG" "$@"
710 comment_for_reflog start
712 require_clean_work_tree
714 if test ! -z "$1"
715 then
716 output git show-ref --verify --quiet "refs/heads/$1" ||
717 die "Invalid branchname: $1"
718 output git checkout "$1" ||
719 die "Could not checkout $1"
720 fi
722 HEAD=$(git rev-parse --verify HEAD) || die "No HEAD?"
723 mkdir "$DOTEST" || die "Could not create temporary $DOTEST"
725 : > "$DOTEST"/interactive || die "Could not mark as interactive"
726 git symbolic-ref HEAD > "$DOTEST"/head-name 2> /dev/null ||
727 echo "detached HEAD" > "$DOTEST"/head-name
729 echo $HEAD > "$DOTEST"/head
730 case "$REBASE_ROOT" in
731 '')
732 rm -f "$DOTEST"/rebase-root ;;
733 *)
734 : >"$DOTEST"/rebase-root ;;
735 esac
736 echo $ONTO > "$DOTEST"/onto
737 test -z "$STRATEGY" || echo "$STRATEGY" > "$DOTEST"/strategy
738 test t = "$VERBOSE" && : > "$DOTEST"/verbose
739 if test t = "$PRESERVE_MERGES"
740 then
741 if test -z "$REBASE_ROOT"
742 then
743 mkdir "$REWRITTEN" &&
744 for c in $(git merge-base --all $HEAD $UPSTREAM)
745 do
746 echo $ONTO > "$REWRITTEN"/$c ||
747 die "Could not init rewritten commits"
748 done
749 else
750 mkdir "$REWRITTEN" &&
751 echo $ONTO > "$REWRITTEN"/root ||
752 die "Could not init rewritten commits"
753 fi
754 # No cherry-pick because our first pass is to determine
755 # parents to rewrite and skipping dropped commits would
756 # prematurely end our probe
757 MERGES_OPTION=
758 first_after_upstream="$(git rev-list --reverse --first-parent $UPSTREAM..$HEAD | head -n 1)"
759 else
760 MERGES_OPTION="--no-merges --cherry-pick"
761 fi
763 SHORTHEAD=$(git rev-parse --short $HEAD)
764 SHORTONTO=$(git rev-parse --short $ONTO)
765 if test -z "$REBASE_ROOT"
766 # this is now equivalent to ! -z "$UPSTREAM"
767 then
768 SHORTUPSTREAM=$(git rev-parse --short $UPSTREAM)
769 REVISIONS=$UPSTREAM...$HEAD
770 SHORTREVISIONS=$SHORTUPSTREAM..$SHORTHEAD
771 else
772 REVISIONS=$ONTO...$HEAD
773 SHORTREVISIONS=$SHORTHEAD
774 fi
775 git rev-list $MERGES_OPTION --pretty=oneline --abbrev-commit \
776 --abbrev=7 --reverse --left-right --topo-order \
777 $REVISIONS | \
778 sed -n "s/^>//p" | while read shortsha1 rest
779 do
780 if test t != "$PRESERVE_MERGES"
781 then
782 echo "pick $shortsha1 $rest" >> "$TODO"
783 else
784 sha1=$(git rev-parse $shortsha1)
785 if test -z "$REBASE_ROOT"
786 then
787 preserve=t
788 for p in $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)
789 do
790 if test -f "$REWRITTEN"/$p -a \( $p != $ONTO -o $sha1 = $first_after_upstream \)
791 then
792 preserve=f
793 fi
794 done
795 else
796 preserve=f
797 fi
798 if test f = "$preserve"
799 then
800 touch "$REWRITTEN"/$sha1
801 echo "pick $shortsha1 $rest" >> "$TODO"
802 fi
803 fi
804 done
806 # Watch for commits that been dropped by --cherry-pick
807 if test t = "$PRESERVE_MERGES"
808 then
809 mkdir "$DROPPED"
810 # Save all non-cherry-picked changes
811 git rev-list $REVISIONS --left-right --cherry-pick | \
812 sed -n "s/^>//p" > "$DOTEST"/not-cherry-picks
813 # Now all commits and note which ones are missing in
814 # not-cherry-picks and hence being dropped
815 git rev-list $REVISIONS |
816 while read rev
817 do
818 if test -f "$REWRITTEN"/$rev -a "$(sane_grep "$rev" "$DOTEST"/not-cherry-picks)" = ""
819 then
820 # Use -f2 because if rev-list is telling us this commit is
821 # not worthwhile, we don't want to track its multiple heads,
822 # just the history of its first-parent for others that will
823 # be rebasing on top of it
824 git rev-list --parents -1 $rev | cut -d' ' -s -f2 > "$DROPPED"/$rev
825 short=$(git rev-list -1 --abbrev-commit --abbrev=7 $rev)
826 sane_grep -v "^[a-z][a-z]* $short" <"$TODO" > "${TODO}2" ; mv "${TODO}2" "$TODO"
827 rm "$REWRITTEN"/$rev
828 fi
829 done
830 fi
832 test -s "$TODO" || echo noop >> "$TODO"
833 cat >> "$TODO" << EOF
835 # Rebase $SHORTREVISIONS onto $SHORTONTO
836 #
837 # Commands:
838 # p, pick = use commit
839 # r, reword = use commit, but edit the commit message
840 # e, edit = use commit, but stop for amending
841 # s, squash = use commit, but meld into previous commit
842 # f, fixup = like "squash", but discard this commit's log message
843 #
844 # If you remove a line here THAT COMMIT WILL BE LOST.
845 # However, if you remove everything, the rebase will be aborted.
846 #
847 EOF
849 has_action "$TODO" ||
850 die_abort "Nothing to do"
852 cp "$TODO" "$TODO".backup
853 git_editor "$TODO" ||
854 die "Could not execute editor"
856 has_action "$TODO" ||
857 die_abort "Nothing to do"
859 test -d "$REWRITTEN" || skip_unnecessary_picks
861 git update-ref ORIG_HEAD $HEAD
862 output git checkout $ONTO && do_rest
863 ;;
864 esac
865 shift
866 done