Merge branch 'jl/submodule-ignore-diff'
[git] / git-rebase--interactive.sh
1 #!/bin/sh
2 #
3 # Copyright (c) 2006 Johannes E. Schindelin
4
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
12
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 no-ff              cherry-pick all commits, even if unchanged
24 m,merge            always used (no-op)
25 i,interactive      always used (no-op)
26  Actions:
27 continue           continue rebasing process
28 abort              abort rebasing process and restore original branch
29 skip               skip current patch and continue rebasing process
30 no-verify          override pre-rebase hook from stopping the operation
31 root               rebase all reachable commmits up to the root(s)
32 autosquash         move commits that begin with squash!/fixup! under -i
33 "
34
35 . git-sh-setup
36 require_work_tree
37
38 DOTEST="$GIT_DIR/rebase-merge"
39
40 # The file containing rebase commands, comments, and empty lines.
41 # This file is created by "git rebase -i" then edited by the user.  As
42 # the lines are processed, they are removed from the front of this
43 # file and written to the tail of $DONE.
44 TODO="$DOTEST"/git-rebase-todo
45
46 # The rebase command lines that have already been processed.  A line
47 # is moved here when it is first handled, before any associated user
48 # actions.
49 DONE="$DOTEST"/done
50
51 # The commit message that is planned to be used for any changes that
52 # need to be committed following a user interaction.
53 MSG="$DOTEST"/message
54
55 # The file into which is accumulated the suggested commit message for
56 # squash/fixup commands.  When the first of a series of squash/fixups
57 # is seen, the file is created and the commit message from the
58 # previous commit and from the first squash/fixup commit are written
59 # to it.  The commit message for each subsequent squash/fixup commit
60 # is appended to the file as it is processed.
61 #
62 # The first line of the file is of the form
63 #     # This is a combination of $COUNT commits.
64 # where $COUNT is the number of commits whose messages have been
65 # written to the file so far (including the initial "pick" commit).
66 # Each time that a commit message is processed, this line is read and
67 # updated.  It is deleted just before the combined commit is made.
68 SQUASH_MSG="$DOTEST"/message-squash
69
70 # If the current series of squash/fixups has not yet included a squash
71 # command, then this file exists and holds the commit message of the
72 # original "pick" commit.  (If the series ends without a "squash"
73 # command, then this can be used as the commit message of the combined
74 # commit without opening the editor.)
75 FIXUP_MSG="$DOTEST"/message-fixup
76
77 # $REWRITTEN is the name of a directory containing files for each
78 # commit that is reachable by at least one merge base of $HEAD and
79 # $UPSTREAM. They are not necessarily rewritten, but their children
80 # might be.  This ensures that commits on merged, but otherwise
81 # unrelated side branches are left alone. (Think "X" in the man page's
82 # example.)
83 REWRITTEN="$DOTEST"/rewritten
84
85 DROPPED="$DOTEST"/dropped
86
87 # A script to set the GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, and
88 # GIT_AUTHOR_DATE that will be used for the commit that is currently
89 # being rebased.
90 AUTHOR_SCRIPT="$DOTEST"/author-script
91
92 # When an "edit" rebase command is being processed, the SHA1 of the
93 # commit to be edited is recorded in this file.  When "git rebase
94 # --continue" is executed, if there are any staged changes then they
95 # will be amended to the HEAD commit, but only provided the HEAD
96 # commit is still the commit to be edited.  When any other rebase
97 # command is processed, this file is deleted.
98 AMEND="$DOTEST"/amend
99
100 # For the post-rewrite hook, we make a list of rewritten commits and
101 # their new sha1s.  The rewritten-pending list keeps the sha1s of
102 # commits that have been processed, but not committed yet,
103 # e.g. because they are waiting for a 'squash' command.
104 REWRITTEN_LIST="$DOTEST"/rewritten-list
105 REWRITTEN_PENDING="$DOTEST"/rewritten-pending
106
107 PRESERVE_MERGES=
108 STRATEGY=
109 ONTO=
110 VERBOSE=
111 OK_TO_SKIP_PRE_REBASE=
112 REBASE_ROOT=
113 AUTOSQUASH=
114 NEVER_FF=
115
116 GIT_CHERRY_PICK_HELP="  After resolving the conflicts,
117 mark the corrected paths with 'git add <paths>', and
118 run 'git rebase --continue'"
119 export GIT_CHERRY_PICK_HELP
120
121 warn () {
122         printf '%s\n' "$*" >&2
123 }
124
125 output () {
126         case "$VERBOSE" in
127         '')
128                 output=$("$@" 2>&1 )
129                 status=$?
130                 test $status != 0 && printf "%s\n" "$output"
131                 return $status
132                 ;;
133         *)
134                 "$@"
135                 ;;
136         esac
137 }
138
139 # Output the commit message for the specified commit.
140 commit_message () {
141         git cat-file commit "$1" | sed "1,/^$/d"
142 }
143
144 run_pre_rebase_hook () {
145         if test -z "$OK_TO_SKIP_PRE_REBASE" &&
146            test -x "$GIT_DIR/hooks/pre-rebase"
147         then
148                 "$GIT_DIR/hooks/pre-rebase" ${1+"$@"} || {
149                         echo >&2 "The pre-rebase hook refused to rebase."
150                         exit 1
151                 }
152         fi
153 }
154
155 require_clean_work_tree () {
156         # test if working tree is dirty
157         git rev-parse --verify HEAD > /dev/null &&
158         git update-index --ignore-submodules --refresh &&
159         git diff-files --quiet --ignore-submodules &&
160         git diff-index --cached --quiet HEAD --ignore-submodules -- ||
161         die "Working tree is dirty"
162 }
163
164 ORIG_REFLOG_ACTION="$GIT_REFLOG_ACTION"
165
166 comment_for_reflog () {
167         case "$ORIG_REFLOG_ACTION" in
168         ''|rebase*)
169                 GIT_REFLOG_ACTION="rebase -i ($1)"
170                 export GIT_REFLOG_ACTION
171                 ;;
172         esac
173 }
174
175 last_count=
176 mark_action_done () {
177         sed -e 1q < "$TODO" >> "$DONE"
178         sed -e 1d < "$TODO" >> "$TODO".new
179         mv -f "$TODO".new "$TODO"
180         count=$(sane_grep -c '^[^#]' < "$DONE")
181         total=$(($count+$(sane_grep -c '^[^#]' < "$TODO")))
182         if test "$last_count" != "$count"
183         then
184                 last_count=$count
185                 printf "Rebasing (%d/%d)\r" $count $total
186                 test -z "$VERBOSE" || echo
187         fi
188 }
189
190 make_patch () {
191         sha1_and_parents="$(git rev-list --parents -1 "$1")"
192         case "$sha1_and_parents" in
193         ?*' '?*' '?*)
194                 git diff --cc $sha1_and_parents
195                 ;;
196         ?*' '?*)
197                 git diff-tree -p "$1^!"
198                 ;;
199         *)
200                 echo "Root commit"
201                 ;;
202         esac > "$DOTEST"/patch
203         test -f "$MSG" ||
204                 commit_message "$1" > "$MSG"
205         test -f "$AUTHOR_SCRIPT" ||
206                 get_author_ident_from_commit "$1" > "$AUTHOR_SCRIPT"
207 }
208
209 die_with_patch () {
210         echo "$1" > "$DOTEST"/stopped-sha
211         make_patch "$1"
212         git rerere
213         die "$2"
214 }
215
216 die_abort () {
217         rm -rf "$DOTEST"
218         die "$1"
219 }
220
221 has_action () {
222         sane_grep '^[^#]' "$1" >/dev/null
223 }
224
225 # Run command with GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, and
226 # GIT_AUTHOR_DATE exported from the current environment.
227 do_with_author () {
228         (
229                 export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_AUTHOR_DATE
230                 "$@"
231         )
232 }
233
234 pick_one () {
235         ff=--ff
236         case "$1" in -n) sha1=$2; ff= ;; *) sha1=$1 ;; esac
237         case "$NEVER_FF" in '') ;; ?*) ff= ;; esac
238         output git rev-parse --verify $sha1 || die "Invalid commit name: $sha1"
239         test -d "$REWRITTEN" &&
240                 pick_one_preserving_merges "$@" && return
241         if test -n "$REBASE_ROOT"
242         then
243                 output git cherry-pick "$@"
244                 return
245         fi
246         output git cherry-pick $ff "$@"
247 }
248
249 pick_one_preserving_merges () {
250         fast_forward=t
251         case "$1" in
252         -n)
253                 fast_forward=f
254                 sha1=$2
255                 ;;
256         *)
257                 sha1=$1
258                 ;;
259         esac
260         sha1=$(git rev-parse $sha1)
261
262         if test -f "$DOTEST"/current-commit
263         then
264                 if test "$fast_forward" = t
265                 then
266                         while read current_commit
267                         do
268                                 git rev-parse HEAD > "$REWRITTEN"/$current_commit
269                         done <"$DOTEST"/current-commit
270                         rm "$DOTEST"/current-commit ||
271                         die "Cannot write current commit's replacement sha1"
272                 fi
273         fi
274
275         echo $sha1 >> "$DOTEST"/current-commit
276
277         # rewrite parents; if none were rewritten, we can fast-forward.
278         new_parents=
279         pend=" $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)"
280         if test "$pend" = " "
281         then
282                 pend=" root"
283         fi
284         while [ "$pend" != "" ]
285         do
286                 p=$(expr "$pend" : ' \([^ ]*\)')
287                 pend="${pend# $p}"
288
289                 if test -f "$REWRITTEN"/$p
290                 then
291                         new_p=$(cat "$REWRITTEN"/$p)
292
293                         # If the todo reordered commits, and our parent is marked for
294                         # rewriting, but hasn't been gotten to yet, assume the user meant to
295                         # drop it on top of the current HEAD
296                         if test -z "$new_p"
297                         then
298                                 new_p=$(git rev-parse HEAD)
299                         fi
300
301                         test $p != $new_p && fast_forward=f
302                         case "$new_parents" in
303                         *$new_p*)
304                                 ;; # do nothing; that parent is already there
305                         *)
306                                 new_parents="$new_parents $new_p"
307                                 ;;
308                         esac
309                 else
310                         if test -f "$DROPPED"/$p
311                         then
312                                 fast_forward=f
313                                 replacement="$(cat "$DROPPED"/$p)"
314                                 test -z "$replacement" && replacement=root
315                                 pend=" $replacement$pend"
316                         else
317                                 new_parents="$new_parents $p"
318                         fi
319                 fi
320         done
321         case $fast_forward in
322         t)
323                 output warn "Fast-forward to $sha1"
324                 output git reset --hard $sha1 ||
325                         die "Cannot fast-forward to $sha1"
326                 ;;
327         f)
328                 first_parent=$(expr "$new_parents" : ' \([^ ]*\)')
329
330                 if [ "$1" != "-n" ]
331                 then
332                         # detach HEAD to current parent
333                         output git checkout $first_parent 2> /dev/null ||
334                                 die "Cannot move HEAD to $first_parent"
335                 fi
336
337                 case "$new_parents" in
338                 ' '*' '*)
339                         test "a$1" = a-n && die "Refusing to squash a merge: $sha1"
340
341                         # redo merge
342                         author_script=$(get_author_ident_from_commit $sha1)
343                         eval "$author_script"
344                         msg="$(commit_message $sha1)"
345                         # No point in merging the first parent, that's HEAD
346                         new_parents=${new_parents# $first_parent}
347                         if ! do_with_author output \
348                                 git merge $STRATEGY -m "$msg" $new_parents
349                         then
350                                 printf "%s\n" "$msg" > "$GIT_DIR"/MERGE_MSG
351                                 die_with_patch $sha1 "Error redoing merge $sha1"
352                         fi
353                         echo "$sha1 $(git rev-parse HEAD^0)" >> "$REWRITTEN_LIST"
354                         ;;
355                 *)
356                         output git cherry-pick "$@" ||
357                                 die_with_patch $sha1 "Could not pick $sha1"
358                         ;;
359                 esac
360                 ;;
361         esac
362 }
363
364 nth_string () {
365         case "$1" in
366         *1[0-9]|*[04-9]) echo "$1"th;;
367         *1) echo "$1"st;;
368         *2) echo "$1"nd;;
369         *3) echo "$1"rd;;
370         esac
371 }
372
373 update_squash_messages () {
374         if test -f "$SQUASH_MSG"; then
375                 mv "$SQUASH_MSG" "$SQUASH_MSG".bak || exit
376                 COUNT=$(($(sed -n \
377                         -e "1s/^# This is a combination of \(.*\) commits\./\1/p" \
378                         -e "q" < "$SQUASH_MSG".bak)+1))
379                 {
380                         echo "# This is a combination of $COUNT commits."
381                         sed -e 1d -e '2,/^./{
382                                 /^$/d
383                         }' <"$SQUASH_MSG".bak
384                 } >"$SQUASH_MSG"
385         else
386                 commit_message HEAD > "$FIXUP_MSG" || die "Cannot write $FIXUP_MSG"
387                 COUNT=2
388                 {
389                         echo "# This is a combination of 2 commits."
390                         echo "# The first commit's message is:"
391                         echo
392                         cat "$FIXUP_MSG"
393                 } >"$SQUASH_MSG"
394         fi
395         case $1 in
396         squash)
397                 rm -f "$FIXUP_MSG"
398                 echo
399                 echo "# This is the $(nth_string $COUNT) commit message:"
400                 echo
401                 commit_message $2
402                 ;;
403         fixup)
404                 echo
405                 echo "# The $(nth_string $COUNT) commit message will be skipped:"
406                 echo
407                 commit_message $2 | sed -e 's/^/#       /'
408                 ;;
409         esac >>"$SQUASH_MSG"
410 }
411
412 peek_next_command () {
413         sed -n -e "/^#/d" -e '/^$/d' -e "s/ .*//p" -e "q" < "$TODO"
414 }
415
416 # A squash/fixup has failed.  Prepare the long version of the squash
417 # commit message, then die_with_patch.  This code path requires the
418 # user to edit the combined commit message for all commits that have
419 # been squashed/fixedup so far.  So also erase the old squash
420 # messages, effectively causing the combined commit to be used as the
421 # new basis for any further squash/fixups.  Args: sha1 rest
422 die_failed_squash() {
423         mv "$SQUASH_MSG" "$MSG" || exit
424         rm -f "$FIXUP_MSG"
425         cp "$MSG" "$GIT_DIR"/MERGE_MSG || exit
426         warn
427         warn "Could not apply $1... $2"
428         die_with_patch $1 ""
429 }
430
431 flush_rewritten_pending() {
432         test -s "$REWRITTEN_PENDING" || return
433         newsha1="$(git rev-parse HEAD^0)"
434         sed "s/$/ $newsha1/" < "$REWRITTEN_PENDING" >> "$REWRITTEN_LIST"
435         rm -f "$REWRITTEN_PENDING"
436 }
437
438 record_in_rewritten() {
439         oldsha1="$(git rev-parse $1)"
440         echo "$oldsha1" >> "$REWRITTEN_PENDING"
441
442         case "$(peek_next_command)" in
443         squash|s|fixup|f)
444                 ;;
445         *)
446                 flush_rewritten_pending
447                 ;;
448         esac
449 }
450
451 do_next () {
452         rm -f "$MSG" "$AUTHOR_SCRIPT" "$AMEND" || exit
453         read -r command sha1 rest < "$TODO"
454         case "$command" in
455         '#'*|''|noop)
456                 mark_action_done
457                 ;;
458         pick|p)
459                 comment_for_reflog pick
460
461                 mark_action_done
462                 pick_one $sha1 ||
463                         die_with_patch $sha1 "Could not apply $sha1... $rest"
464                 record_in_rewritten $sha1
465                 ;;
466         reword|r)
467                 comment_for_reflog reword
468
469                 mark_action_done
470                 pick_one $sha1 ||
471                         die_with_patch $sha1 "Could not apply $sha1... $rest"
472                 git commit --amend --no-post-rewrite
473                 record_in_rewritten $sha1
474                 ;;
475         edit|e)
476                 comment_for_reflog edit
477
478                 mark_action_done
479                 pick_one $sha1 ||
480                         die_with_patch $sha1 "Could not apply $sha1... $rest"
481                 echo "$sha1" > "$DOTEST"/stopped-sha
482                 make_patch $sha1
483                 git rev-parse --verify HEAD > "$AMEND"
484                 warn "Stopped at $sha1... $rest"
485                 warn "You can amend the commit now, with"
486                 warn
487                 warn "  git commit --amend"
488                 warn
489                 warn "Once you are satisfied with your changes, run"
490                 warn
491                 warn "  git rebase --continue"
492                 warn
493                 exit 0
494                 ;;
495         squash|s|fixup|f)
496                 case "$command" in
497                 squash|s)
498                         squash_style=squash
499                         ;;
500                 fixup|f)
501                         squash_style=fixup
502                         ;;
503                 esac
504                 comment_for_reflog $squash_style
505
506                 test -f "$DONE" && has_action "$DONE" ||
507                         die "Cannot '$squash_style' without a previous commit"
508
509                 mark_action_done
510                 update_squash_messages $squash_style $sha1
511                 author_script=$(get_author_ident_from_commit HEAD)
512                 echo "$author_script" > "$AUTHOR_SCRIPT"
513                 eval "$author_script"
514                 output git reset --soft HEAD^
515                 pick_one -n $sha1 || die_failed_squash $sha1 "$rest"
516                 case "$(peek_next_command)" in
517                 squash|s|fixup|f)
518                         # This is an intermediate commit; its message will only be
519                         # used in case of trouble.  So use the long version:
520                         do_with_author output git commit --no-verify -F "$SQUASH_MSG" ||
521                                 die_failed_squash $sha1 "$rest"
522                         ;;
523                 *)
524                         # This is the final command of this squash/fixup group
525                         if test -f "$FIXUP_MSG"
526                         then
527                                 do_with_author git commit --no-verify -F "$FIXUP_MSG" ||
528                                         die_failed_squash $sha1 "$rest"
529                         else
530                                 cp "$SQUASH_MSG" "$GIT_DIR"/SQUASH_MSG || exit
531                                 rm -f "$GIT_DIR"/MERGE_MSG
532                                 do_with_author git commit --no-verify -e ||
533                                         die_failed_squash $sha1 "$rest"
534                         fi
535                         rm -f "$SQUASH_MSG" "$FIXUP_MSG"
536                         ;;
537                 esac
538                 record_in_rewritten $sha1
539                 ;;
540         *)
541                 warn "Unknown command: $command $sha1 $rest"
542                 if git rev-parse --verify -q "$sha1" >/dev/null
543                 then
544                         die_with_patch $sha1 "Please fix this in the file $TODO."
545                 else
546                         die "Please fix this in the file $TODO."
547                 fi
548                 ;;
549         esac
550         test -s "$TODO" && return
551
552         comment_for_reflog finish &&
553         HEADNAME=$(cat "$DOTEST"/head-name) &&
554         OLDHEAD=$(cat "$DOTEST"/head) &&
555         SHORTONTO=$(git rev-parse --short $(cat "$DOTEST"/onto)) &&
556         NEWHEAD=$(git rev-parse HEAD) &&
557         case $HEADNAME in
558         refs/*)
559                 message="$GIT_REFLOG_ACTION: $HEADNAME onto $SHORTONTO" &&
560                 git update-ref -m "$message" $HEADNAME $NEWHEAD $OLDHEAD &&
561                 git symbolic-ref HEAD $HEADNAME
562                 ;;
563         esac && {
564                 test ! -f "$DOTEST"/verbose ||
565                         git diff-tree --stat $(cat "$DOTEST"/head)..HEAD
566         } &&
567         {
568                 test -s "$REWRITTEN_LIST" &&
569                 git notes copy --for-rewrite=rebase < "$REWRITTEN_LIST" ||
570                 true # we don't care if this copying failed
571         } &&
572         if test -x "$GIT_DIR"/hooks/post-rewrite &&
573                 test -s "$REWRITTEN_LIST"; then
574                 "$GIT_DIR"/hooks/post-rewrite rebase < "$REWRITTEN_LIST"
575                 true # we don't care if this hook failed
576         fi &&
577         rm -rf "$DOTEST" &&
578         git gc --auto &&
579         warn "Successfully rebased and updated $HEADNAME."
580
581         exit
582 }
583
584 do_rest () {
585         while :
586         do
587                 do_next
588         done
589 }
590
591 # skip picking commits whose parents are unchanged
592 skip_unnecessary_picks () {
593         fd=3
594         while read -r command sha1 rest
595         do
596                 # fd=3 means we skip the command
597                 case "$fd,$command,$(git rev-parse --verify --quiet $sha1^)" in
598                 3,pick,"$ONTO"*|3,p,"$ONTO"*)
599                         # pick a commit whose parent is current $ONTO -> skip
600                         ONTO=$sha1
601                         ;;
602                 3,#*|3,,*)
603                         # copy comments
604                         ;;
605                 *)
606                         fd=1
607                         ;;
608                 esac
609                 printf '%s\n' "$command${sha1:+ }$sha1${rest:+ }$rest" >&$fd
610         done <"$TODO" >"$TODO.new" 3>>"$DONE" &&
611         mv -f "$TODO".new "$TODO" &&
612         case "$(peek_next_command)" in
613         squash|s|fixup|f)
614                 record_in_rewritten "$ONTO"
615                 ;;
616         esac ||
617         die "Could not skip unnecessary pick commands"
618 }
619
620 # check if no other options are set
621 is_standalone () {
622         test $# -eq 2 -a "$2" = '--' &&
623         test -z "$ONTO" &&
624         test -z "$PRESERVE_MERGES" &&
625         test -z "$STRATEGY" &&
626         test -z "$VERBOSE"
627 }
628
629 get_saved_options () {
630         test -d "$REWRITTEN" && PRESERVE_MERGES=t
631         test -f "$DOTEST"/strategy && STRATEGY="$(cat "$DOTEST"/strategy)"
632         test -f "$DOTEST"/verbose && VERBOSE=t
633         test -f "$DOTEST"/rebase-root && REBASE_ROOT=t
634 }
635
636 # Rearrange the todo list that has both "pick sha1 msg" and
637 # "pick sha1 fixup!/squash! msg" appears in it so that the latter
638 # comes immediately after the former, and change "pick" to
639 # "fixup"/"squash".
640 rearrange_squash () {
641         sed -n -e 's/^pick \([0-9a-f]*\) \(squash\)! /\1 \2 /p' \
642                 -e 's/^pick \([0-9a-f]*\) \(fixup\)! /\1 \2 /p' \
643                 "$1" >"$1.sq"
644         test -s "$1.sq" || return
645
646         used=
647         while read -r pick sha1 message
648         do
649                 case " $used" in
650                 *" $sha1 "*) continue ;;
651                 esac
652                 printf '%s\n' "$pick $sha1 $message"
653                 while read -r squash action msg
654                 do
655                         case "$message" in
656                         "$msg"*)
657                                 printf '%s\n' "$action $squash $action! $msg"
658                                 used="$used$squash "
659                                 ;;
660                         esac
661                 done <"$1.sq"
662         done >"$1.rearranged" <"$1"
663         cat "$1.rearranged" >"$1"
664         rm -f "$1.sq" "$1.rearranged"
665 }
666
667 LF='
668 '
669 parse_onto () {
670         case "$1" in
671         *...*)
672                 if      left=${1%...*} right=${1#*...} &&
673                         onto=$(git merge-base --all ${left:-HEAD} ${right:-HEAD})
674                 then
675                         case "$onto" in
676                         ?*"$LF"?* | '')
677                                 exit 1 ;;
678                         esac
679                         echo "$onto"
680                         exit 0
681                 fi
682         esac
683         git rev-parse --verify "$1^0"
684 }
685
686 while test $# != 0
687 do
688         case "$1" in
689         --no-verify)
690                 OK_TO_SKIP_PRE_REBASE=yes
691                 ;;
692         --verify)
693                 ;;
694         --continue)
695                 is_standalone "$@" || usage
696                 get_saved_options
697                 comment_for_reflog continue
698
699                 test -d "$DOTEST" || die "No interactive rebase running"
700
701                 # Sanity check
702                 git rev-parse --verify HEAD >/dev/null ||
703                         die "Cannot read HEAD"
704                 git update-index --ignore-submodules --refresh &&
705                         git diff-files --quiet --ignore-submodules ||
706                         die "Working tree is dirty"
707
708                 # do we have anything to commit?
709                 if git diff-index --cached --quiet --ignore-submodules HEAD --
710                 then
711                         : Nothing to commit -- skip this
712                 else
713                         . "$AUTHOR_SCRIPT" ||
714                                 die "Cannot find the author identity"
715                         amend=
716                         if test -f "$AMEND"
717                         then
718                                 amend=$(git rev-parse --verify HEAD)
719                                 test "$amend" = $(cat "$AMEND") ||
720                                 die "\
721 You have uncommitted changes in your working tree. Please, commit them
722 first and then run 'git rebase --continue' again."
723                                 git reset --soft HEAD^ ||
724                                 die "Cannot rewind the HEAD"
725                         fi
726                         do_with_author git commit --no-verify -F "$MSG" -e || {
727                                 test -n "$amend" && git reset --soft $amend
728                                 die "Could not commit staged changes."
729                         }
730                 fi
731
732                 record_in_rewritten "$(cat "$DOTEST"/stopped-sha)"
733
734                 require_clean_work_tree
735                 do_rest
736                 ;;
737         --abort)
738                 is_standalone "$@" || usage
739                 get_saved_options
740                 comment_for_reflog abort
741
742                 git rerere clear
743                 test -d "$DOTEST" || die "No interactive rebase running"
744
745                 HEADNAME=$(cat "$DOTEST"/head-name)
746                 HEAD=$(cat "$DOTEST"/head)
747                 case $HEADNAME in
748                 refs/*)
749                         git symbolic-ref HEAD $HEADNAME
750                         ;;
751                 esac &&
752                 output git reset --hard $HEAD &&
753                 rm -rf "$DOTEST"
754                 exit
755                 ;;
756         --skip)
757                 is_standalone "$@" || usage
758                 get_saved_options
759                 comment_for_reflog skip
760
761                 git rerere clear
762                 test -d "$DOTEST" || die "No interactive rebase running"
763
764                 output git reset --hard && do_rest
765                 ;;
766         -s)
767                 case "$#,$1" in
768                 *,*=*)
769                         STRATEGY="-s "$(expr "z$1" : 'z-[^=]*=\(.*\)') ;;
770                 1,*)
771                         usage ;;
772                 *)
773                         STRATEGY="-s $2"
774                         shift ;;
775                 esac
776                 ;;
777         -m)
778                 # we use merge anyway
779                 ;;
780         -v)
781                 VERBOSE=t
782                 ;;
783         -p)
784                 PRESERVE_MERGES=t
785                 ;;
786         -i)
787                 # yeah, we know
788                 ;;
789         --no-ff)
790                 NEVER_FF=t
791                 ;;
792         --root)
793                 REBASE_ROOT=t
794                 ;;
795         --autosquash)
796                 AUTOSQUASH=t
797                 ;;
798         --onto)
799                 shift
800                 ONTO=$(parse_onto "$1") ||
801                         die "Does not point to a valid commit: $1"
802                 ;;
803         --)
804                 shift
805                 test -z "$REBASE_ROOT" -a $# -ge 1 -a $# -le 2 ||
806                 test ! -z "$REBASE_ROOT" -a $# -le 1 || usage
807                 test -d "$DOTEST" &&
808                         die "Interactive rebase already started"
809
810                 git var GIT_COMMITTER_IDENT >/dev/null ||
811                         die "You need to set your committer info first"
812
813                 if test -z "$REBASE_ROOT"
814                 then
815                         UPSTREAM_ARG="$1"
816                         UPSTREAM=$(git rev-parse --verify "$1") || die "Invalid base"
817                         test -z "$ONTO" && ONTO=$UPSTREAM
818                         shift
819                 else
820                         UPSTREAM=
821                         UPSTREAM_ARG=--root
822                         test -z "$ONTO" &&
823                                 die "You must specify --onto when using --root"
824                 fi
825                 run_pre_rebase_hook "$UPSTREAM_ARG" "$@"
826
827                 comment_for_reflog start
828
829                 require_clean_work_tree
830
831                 if test ! -z "$1"
832                 then
833                         output git checkout "$1" ||
834                                 die "Could not checkout $1"
835                 fi
836
837                 HEAD=$(git rev-parse --verify HEAD) || die "No HEAD?"
838                 mkdir "$DOTEST" || die "Could not create temporary $DOTEST"
839
840                 : > "$DOTEST"/interactive || die "Could not mark as interactive"
841                 git symbolic-ref HEAD > "$DOTEST"/head-name 2> /dev/null ||
842                         echo "detached HEAD" > "$DOTEST"/head-name
843
844                 echo $HEAD > "$DOTEST"/head
845                 case "$REBASE_ROOT" in
846                 '')
847                         rm -f "$DOTEST"/rebase-root ;;
848                 *)
849                         : >"$DOTEST"/rebase-root ;;
850                 esac
851                 echo $ONTO > "$DOTEST"/onto
852                 test -z "$STRATEGY" || echo "$STRATEGY" > "$DOTEST"/strategy
853                 test t = "$VERBOSE" && : > "$DOTEST"/verbose
854                 if test t = "$PRESERVE_MERGES"
855                 then
856                         if test -z "$REBASE_ROOT"
857                         then
858                                 mkdir "$REWRITTEN" &&
859                                 for c in $(git merge-base --all $HEAD $UPSTREAM)
860                                 do
861                                         echo $ONTO > "$REWRITTEN"/$c ||
862                                                 die "Could not init rewritten commits"
863                                 done
864                         else
865                                 mkdir "$REWRITTEN" &&
866                                 echo $ONTO > "$REWRITTEN"/root ||
867                                         die "Could not init rewritten commits"
868                         fi
869                         # No cherry-pick because our first pass is to determine
870                         # parents to rewrite and skipping dropped commits would
871                         # prematurely end our probe
872                         MERGES_OPTION=
873                         first_after_upstream="$(git rev-list --reverse --first-parent $UPSTREAM..$HEAD | head -n 1)"
874                 else
875                         MERGES_OPTION="--no-merges --cherry-pick"
876                 fi
877
878                 SHORTHEAD=$(git rev-parse --short $HEAD)
879                 SHORTONTO=$(git rev-parse --short $ONTO)
880                 if test -z "$REBASE_ROOT"
881                         # this is now equivalent to ! -z "$UPSTREAM"
882                 then
883                         SHORTUPSTREAM=$(git rev-parse --short $UPSTREAM)
884                         REVISIONS=$UPSTREAM...$HEAD
885                         SHORTREVISIONS=$SHORTUPSTREAM..$SHORTHEAD
886                 else
887                         REVISIONS=$ONTO...$HEAD
888                         SHORTREVISIONS=$SHORTHEAD
889                 fi
890                 git rev-list $MERGES_OPTION --pretty=oneline --abbrev-commit \
891                         --abbrev=7 --reverse --left-right --topo-order \
892                         $REVISIONS | \
893                         sed -n "s/^>//p" |
894                 while read -r shortsha1 rest
895                 do
896                         if test t != "$PRESERVE_MERGES"
897                         then
898                                 printf '%s\n' "pick $shortsha1 $rest" >> "$TODO"
899                         else
900                                 sha1=$(git rev-parse $shortsha1)
901                                 if test -z "$REBASE_ROOT"
902                                 then
903                                         preserve=t
904                                         for p in $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)
905                                         do
906                                                 if test -f "$REWRITTEN"/$p -a \( $p != $ONTO -o $sha1 = $first_after_upstream \)
907                                                 then
908                                                         preserve=f
909                                                 fi
910                                         done
911                                 else
912                                         preserve=f
913                                 fi
914                                 if test f = "$preserve"
915                                 then
916                                         touch "$REWRITTEN"/$sha1
917                                         printf '%s\n' "pick $shortsha1 $rest" >> "$TODO"
918                                 fi
919                         fi
920                 done
921
922                 # Watch for commits that been dropped by --cherry-pick
923                 if test t = "$PRESERVE_MERGES"
924                 then
925                         mkdir "$DROPPED"
926                         # Save all non-cherry-picked changes
927                         git rev-list $REVISIONS --left-right --cherry-pick | \
928                                 sed -n "s/^>//p" > "$DOTEST"/not-cherry-picks
929                         # Now all commits and note which ones are missing in
930                         # not-cherry-picks and hence being dropped
931                         git rev-list $REVISIONS |
932                         while read rev
933                         do
934                                 if test -f "$REWRITTEN"/$rev -a "$(sane_grep "$rev" "$DOTEST"/not-cherry-picks)" = ""
935                                 then
936                                         # Use -f2 because if rev-list is telling us this commit is
937                                         # not worthwhile, we don't want to track its multiple heads,
938                                         # just the history of its first-parent for others that will
939                                         # be rebasing on top of it
940                                         git rev-list --parents -1 $rev | cut -d' ' -s -f2 > "$DROPPED"/$rev
941                                         short=$(git rev-list -1 --abbrev-commit --abbrev=7 $rev)
942                                         sane_grep -v "^[a-z][a-z]* $short" <"$TODO" > "${TODO}2" ; mv "${TODO}2" "$TODO"
943                                         rm "$REWRITTEN"/$rev
944                                 fi
945                         done
946                 fi
947
948                 test -s "$TODO" || echo noop >> "$TODO"
949                 test -n "$AUTOSQUASH" && rearrange_squash "$TODO"
950                 cat >> "$TODO" << EOF
951
952 # Rebase $SHORTREVISIONS onto $SHORTONTO
953 #
954 # Commands:
955 #  p, pick = use commit
956 #  r, reword = use commit, but edit the commit message
957 #  e, edit = use commit, but stop for amending
958 #  s, squash = use commit, but meld into previous commit
959 #  f, fixup = like "squash", but discard this commit's log message
960 #
961 # If you remove a line here THAT COMMIT WILL BE LOST.
962 # However, if you remove everything, the rebase will be aborted.
963 #
964 EOF
965
966                 has_action "$TODO" ||
967                         die_abort "Nothing to do"
968
969                 cp "$TODO" "$TODO".backup
970                 git_editor "$TODO" ||
971                         die_abort "Could not execute editor"
972
973                 has_action "$TODO" ||
974                         die_abort "Nothing to do"
975
976                 test -d "$REWRITTEN" || test -n "$NEVER_FF" || skip_unnecessary_picks
977
978                 output git checkout $ONTO || die_abort "could not detach HEAD"
979                 git update-ref ORIG_HEAD $HEAD
980                 do_rest
981                 ;;
982         esac
983         shift
984 done