Merge branch 'vs/prompt-avoid-unset-variable'
[git] / git-rebase--interactive.sh
1 # This shell script fragment is sourced by git-rebase to implement
2 # its interactive mode.  "git rebase --interactive" makes it easy
3 # to fix up commits in the middle of a series and rearrange commits.
4 #
5 # Copyright (c) 2006 Johannes E. Schindelin
6 #
7 # The original idea comes from Eric W. Biederman, in
8 # http://article.gmane.org/gmane.comp.version-control.git/22407
9 #
10 # The file containing rebase commands, comments, and empty lines.
11 # This file is created by "git rebase -i" then edited by the user.  As
12 # the lines are processed, they are removed from the front of this
13 # file and written to the tail of $done.
14 todo="$state_dir"/git-rebase-todo
15
16 # The rebase command lines that have already been processed.  A line
17 # is moved here when it is first handled, before any associated user
18 # actions.
19 done="$state_dir"/done
20
21 # The commit message that is planned to be used for any changes that
22 # need to be committed following a user interaction.
23 msg="$state_dir"/message
24
25 # The file into which is accumulated the suggested commit message for
26 # squash/fixup commands.  When the first of a series of squash/fixups
27 # is seen, the file is created and the commit message from the
28 # previous commit and from the first squash/fixup commit are written
29 # to it.  The commit message for each subsequent squash/fixup commit
30 # is appended to the file as it is processed.
31 #
32 # The first line of the file is of the form
33 #     # This is a combination of $count commits.
34 # where $count is the number of commits whose messages have been
35 # written to the file so far (including the initial "pick" commit).
36 # Each time that a commit message is processed, this line is read and
37 # updated.  It is deleted just before the combined commit is made.
38 squash_msg="$state_dir"/message-squash
39
40 # If the current series of squash/fixups has not yet included a squash
41 # command, then this file exists and holds the commit message of the
42 # original "pick" commit.  (If the series ends without a "squash"
43 # command, then this can be used as the commit message of the combined
44 # commit without opening the editor.)
45 fixup_msg="$state_dir"/message-fixup
46
47 # $rewritten is the name of a directory containing files for each
48 # commit that is reachable by at least one merge base of $head and
49 # $upstream. They are not necessarily rewritten, but their children
50 # might be.  This ensures that commits on merged, but otherwise
51 # unrelated side branches are left alone. (Think "X" in the man page's
52 # example.)
53 rewritten="$state_dir"/rewritten
54
55 dropped="$state_dir"/dropped
56
57 end="$state_dir"/end
58 msgnum="$state_dir"/msgnum
59
60 # A script to set the GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, and
61 # GIT_AUTHOR_DATE that will be used for the commit that is currently
62 # being rebased.
63 author_script="$state_dir"/author-script
64
65 # When an "edit" rebase command is being processed, the SHA1 of the
66 # commit to be edited is recorded in this file.  When "git rebase
67 # --continue" is executed, if there are any staged changes then they
68 # will be amended to the HEAD commit, but only provided the HEAD
69 # commit is still the commit to be edited.  When any other rebase
70 # command is processed, this file is deleted.
71 amend="$state_dir"/amend
72
73 # For the post-rewrite hook, we make a list of rewritten commits and
74 # their new sha1s.  The rewritten-pending list keeps the sha1s of
75 # commits that have been processed, but not committed yet,
76 # e.g. because they are waiting for a 'squash' command.
77 rewritten_list="$state_dir"/rewritten-list
78 rewritten_pending="$state_dir"/rewritten-pending
79
80 # Work around Git for Windows' Bash whose "read" does not strip CRLF
81 # and leaves CR at the end instead.
82 cr=$(printf "\015")
83
84 strategy_args=${strategy:+--strategy=$strategy}
85 test -n "$strategy_opts" &&
86 eval '
87         for strategy_opt in '"$strategy_opts"'
88         do
89                 strategy_args="$strategy_args -X$(git rev-parse --sq-quote "${strategy_opt#--}")"
90         done
91 '
92
93 GIT_CHERRY_PICK_HELP="$resolvemsg"
94 export GIT_CHERRY_PICK_HELP
95
96 comment_char=$(git config --get core.commentchar 2>/dev/null | cut -c1)
97 : ${comment_char:=#}
98
99 warn () {
100         printf '%s\n' "$*" >&2
101 }
102
103 # Output the commit message for the specified commit.
104 commit_message () {
105         git cat-file commit "$1" | sed "1,/^$/d"
106 }
107
108 orig_reflog_action="$GIT_REFLOG_ACTION"
109
110 comment_for_reflog () {
111         case "$orig_reflog_action" in
112         ''|rebase*)
113                 GIT_REFLOG_ACTION="rebase -i ($1)"
114                 export GIT_REFLOG_ACTION
115                 ;;
116         esac
117 }
118
119 last_count=
120 mark_action_done () {
121         sed -e 1q < "$todo" >> "$done"
122         sed -e 1d < "$todo" >> "$todo".new
123         mv -f "$todo".new "$todo"
124         new_count=$(git stripspace --strip-comments <"$done" | wc -l)
125         echo $new_count >"$msgnum"
126         total=$(($new_count + $(git stripspace --strip-comments <"$todo" | wc -l)))
127         echo $total >"$end"
128         if test "$last_count" != "$new_count"
129         then
130                 last_count=$new_count
131                 printf "Rebasing (%d/%d)\r" $new_count $total
132                 test -z "$verbose" || echo
133         fi
134 }
135
136 # Put the last action marked done at the beginning of the todo list
137 # again. If there has not been an action marked done yet, leave the list of
138 # items on the todo list unchanged.
139 reschedule_last_action () {
140         tail -n 1 "$done" | cat - "$todo" >"$todo".new
141         sed -e \$d <"$done" >"$done".new
142         mv -f "$todo".new "$todo"
143         mv -f "$done".new "$done"
144 }
145
146 append_todo_help () {
147         git stripspace --comment-lines >>"$todo" <<\EOF
148
149 Commands:
150  p, pick = use commit
151  r, reword = use commit, but edit the commit message
152  e, edit = use commit, but stop for amending
153  s, squash = use commit, but meld into previous commit
154  f, fixup = like "squash", but discard this commit's log message
155  x, exec = run command (the rest of the line) using shell
156  d, drop = remove commit
157
158 These lines can be re-ordered; they are executed from top to bottom.
159
160 EOF
161         if test $(get_missing_commit_check_level) = error
162         then
163                 git stripspace --comment-lines >>"$todo" <<\EOF
164 Do not remove any line. Use 'drop' explicitly to remove a commit.
165 EOF
166         else
167                 git stripspace --comment-lines >>"$todo" <<\EOF
168 If you remove a line here THAT COMMIT WILL BE LOST.
169 EOF
170         fi
171 }
172
173 make_patch () {
174         sha1_and_parents="$(git rev-list --parents -1 "$1")"
175         case "$sha1_and_parents" in
176         ?*' '?*' '?*)
177                 git diff --cc $sha1_and_parents
178                 ;;
179         ?*' '?*)
180                 git diff-tree -p "$1^!"
181                 ;;
182         *)
183                 echo "Root commit"
184                 ;;
185         esac > "$state_dir"/patch
186         test -f "$msg" ||
187                 commit_message "$1" > "$msg"
188         test -f "$author_script" ||
189                 get_author_ident_from_commit "$1" > "$author_script"
190 }
191
192 die_with_patch () {
193         echo "$1" > "$state_dir"/stopped-sha
194         make_patch "$1"
195         die "$2"
196 }
197
198 exit_with_patch () {
199         echo "$1" > "$state_dir"/stopped-sha
200         make_patch $1
201         git rev-parse --verify HEAD > "$amend"
202         gpg_sign_opt_quoted=${gpg_sign_opt:+$(git rev-parse --sq-quote "$gpg_sign_opt")}
203         warn "You can amend the commit now, with"
204         warn
205         warn "  git commit --amend $gpg_sign_opt_quoted"
206         warn
207         warn "Once you are satisfied with your changes, run"
208         warn
209         warn "  git rebase --continue"
210         warn
211         exit $2
212 }
213
214 die_abort () {
215         rm -rf "$state_dir"
216         die "$1"
217 }
218
219 has_action () {
220         test -n "$(git stripspace --strip-comments <"$1")"
221 }
222
223 is_empty_commit() {
224         tree=$(git rev-parse -q --verify "$1"^{tree} 2>/dev/null ||
225                 die "$1: not a commit that can be picked")
226         ptree=$(git rev-parse -q --verify "$1"^^{tree} 2>/dev/null ||
227                 ptree=4b825dc642cb6eb9a060e54bf8d69288fbee4904)
228         test "$tree" = "$ptree"
229 }
230
231 is_merge_commit()
232 {
233         git rev-parse --verify --quiet "$1"^2 >/dev/null 2>&1
234 }
235
236 # Run command with GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, and
237 # GIT_AUTHOR_DATE exported from the current environment.
238 do_with_author () {
239         (
240                 export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_AUTHOR_DATE
241                 "$@"
242         )
243 }
244
245 git_sequence_editor () {
246         if test -z "$GIT_SEQUENCE_EDITOR"
247         then
248                 GIT_SEQUENCE_EDITOR="$(git config sequence.editor)"
249                 if [ -z "$GIT_SEQUENCE_EDITOR" ]
250                 then
251                         GIT_SEQUENCE_EDITOR="$(git var GIT_EDITOR)" || return $?
252                 fi
253         fi
254
255         eval "$GIT_SEQUENCE_EDITOR" '"$@"'
256 }
257
258 pick_one () {
259         ff=--ff
260
261         case "$1" in -n) sha1=$2; ff= ;; *) sha1=$1 ;; esac
262         case "$force_rebase" in '') ;; ?*) ff= ;; esac
263         output git rev-parse --verify $sha1 || die "Invalid commit name: $sha1"
264
265         if is_empty_commit "$sha1"
266         then
267                 empty_args="--allow-empty"
268         fi
269
270         test -d "$rewritten" &&
271                 pick_one_preserving_merges "$@" && return
272         output eval git cherry-pick \
273                         ${gpg_sign_opt:+$(git rev-parse --sq-quote "$gpg_sign_opt")} \
274                         "$strategy_args" $empty_args $ff "$@"
275
276         # If cherry-pick dies it leaves the to-be-picked commit unrecorded. Reschedule
277         # previous task so this commit is not lost.
278         ret=$?
279         case "$ret" in [01]) ;; *) reschedule_last_action ;; esac
280         return $ret
281 }
282
283 pick_one_preserving_merges () {
284         fast_forward=t
285         case "$1" in
286         -n)
287                 fast_forward=f
288                 sha1=$2
289                 ;;
290         *)
291                 sha1=$1
292                 ;;
293         esac
294         sha1=$(git rev-parse $sha1)
295
296         if test -f "$state_dir"/current-commit
297         then
298                 if test "$fast_forward" = t
299                 then
300                         while read current_commit
301                         do
302                                 git rev-parse HEAD > "$rewritten"/$current_commit
303                         done <"$state_dir"/current-commit
304                         rm "$state_dir"/current-commit ||
305                         die "Cannot write current commit's replacement sha1"
306                 fi
307         fi
308
309         echo $sha1 >> "$state_dir"/current-commit
310
311         # rewrite parents; if none were rewritten, we can fast-forward.
312         new_parents=
313         pend=" $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)"
314         if test "$pend" = " "
315         then
316                 pend=" root"
317         fi
318         while [ "$pend" != "" ]
319         do
320                 p=$(expr "$pend" : ' \([^ ]*\)')
321                 pend="${pend# $p}"
322
323                 if test -f "$rewritten"/$p
324                 then
325                         new_p=$(cat "$rewritten"/$p)
326
327                         # If the todo reordered commits, and our parent is marked for
328                         # rewriting, but hasn't been gotten to yet, assume the user meant to
329                         # drop it on top of the current HEAD
330                         if test -z "$new_p"
331                         then
332                                 new_p=$(git rev-parse HEAD)
333                         fi
334
335                         test $p != $new_p && fast_forward=f
336                         case "$new_parents" in
337                         *$new_p*)
338                                 ;; # do nothing; that parent is already there
339                         *)
340                                 new_parents="$new_parents $new_p"
341                                 ;;
342                         esac
343                 else
344                         if test -f "$dropped"/$p
345                         then
346                                 fast_forward=f
347                                 replacement="$(cat "$dropped"/$p)"
348                                 test -z "$replacement" && replacement=root
349                                 pend=" $replacement$pend"
350                         else
351                                 new_parents="$new_parents $p"
352                         fi
353                 fi
354         done
355         case $fast_forward in
356         t)
357                 output warn "Fast-forward to $sha1"
358                 output git reset --hard $sha1 ||
359                         die "Cannot fast-forward to $sha1"
360                 ;;
361         f)
362                 first_parent=$(expr "$new_parents" : ' \([^ ]*\)')
363
364                 if [ "$1" != "-n" ]
365                 then
366                         # detach HEAD to current parent
367                         output git checkout $first_parent 2> /dev/null ||
368                                 die "Cannot move HEAD to $first_parent"
369                 fi
370
371                 case "$new_parents" in
372                 ' '*' '*)
373                         test "a$1" = a-n && die "Refusing to squash a merge: $sha1"
374
375                         # redo merge
376                         author_script_content=$(get_author_ident_from_commit $sha1)
377                         eval "$author_script_content"
378                         msg_content="$(commit_message $sha1)"
379                         # No point in merging the first parent, that's HEAD
380                         new_parents=${new_parents# $first_parent}
381                         merge_args="--no-log --no-ff"
382                         if ! do_with_author output eval \
383                         'git merge ${gpg_sign_opt:+"$gpg_sign_opt"} \
384                                 $merge_args $strategy_args -m "$msg_content" $new_parents'
385                         then
386                                 printf "%s\n" "$msg_content" > "$GIT_DIR"/MERGE_MSG
387                                 die_with_patch $sha1 "Error redoing merge $sha1"
388                         fi
389                         echo "$sha1 $(git rev-parse HEAD^0)" >> "$rewritten_list"
390                         ;;
391                 *)
392                         output eval git cherry-pick \
393                                 ${gpg_sign_opt:+$(git rev-parse --sq-quote "$gpg_sign_opt")} \
394                                 "$strategy_args" "$@" ||
395                                 die_with_patch $sha1 "Could not pick $sha1"
396                         ;;
397                 esac
398                 ;;
399         esac
400 }
401
402 nth_string () {
403         case "$1" in
404         *1[0-9]|*[04-9]) echo "$1"th;;
405         *1) echo "$1"st;;
406         *2) echo "$1"nd;;
407         *3) echo "$1"rd;;
408         esac
409 }
410
411 update_squash_messages () {
412         if test -f "$squash_msg"; then
413                 mv "$squash_msg" "$squash_msg".bak || exit
414                 count=$(($(sed -n \
415                         -e "1s/^. This is a combination of \(.*\) commits\./\1/p" \
416                         -e "q" < "$squash_msg".bak)+1))
417                 {
418                         printf '%s\n' "$comment_char This is a combination of $count commits."
419                         sed -e 1d -e '2,/^./{
420                                 /^$/d
421                         }' <"$squash_msg".bak
422                 } >"$squash_msg"
423         else
424                 commit_message HEAD > "$fixup_msg" || die "Cannot write $fixup_msg"
425                 count=2
426                 {
427                         printf '%s\n' "$comment_char This is a combination of 2 commits."
428                         printf '%s\n' "$comment_char The first commit's message is:"
429                         echo
430                         cat "$fixup_msg"
431                 } >"$squash_msg"
432         fi
433         case $1 in
434         squash)
435                 rm -f "$fixup_msg"
436                 echo
437                 printf '%s\n' "$comment_char This is the $(nth_string $count) commit message:"
438                 echo
439                 commit_message $2
440                 ;;
441         fixup)
442                 echo
443                 printf '%s\n' "$comment_char The $(nth_string $count) commit message will be skipped:"
444                 echo
445                 # Change the space after the comment character to TAB:
446                 commit_message $2 | git stripspace --comment-lines | sed -e 's/ /       /'
447                 ;;
448         esac >>"$squash_msg"
449 }
450
451 peek_next_command () {
452         git stripspace --strip-comments <"$todo" | sed -n -e 's/ .*//p' -e q
453 }
454
455 # A squash/fixup has failed.  Prepare the long version of the squash
456 # commit message, then die_with_patch.  This code path requires the
457 # user to edit the combined commit message for all commits that have
458 # been squashed/fixedup so far.  So also erase the old squash
459 # messages, effectively causing the combined commit to be used as the
460 # new basis for any further squash/fixups.  Args: sha1 rest
461 die_failed_squash() {
462         mv "$squash_msg" "$msg" || exit
463         rm -f "$fixup_msg"
464         cp "$msg" "$GIT_DIR"/MERGE_MSG || exit
465         warn
466         warn "Could not apply $1... $2"
467         die_with_patch $1 ""
468 }
469
470 flush_rewritten_pending() {
471         test -s "$rewritten_pending" || return
472         newsha1="$(git rev-parse HEAD^0)"
473         sed "s/$/ $newsha1/" < "$rewritten_pending" >> "$rewritten_list"
474         rm -f "$rewritten_pending"
475 }
476
477 record_in_rewritten() {
478         oldsha1="$(git rev-parse $1)"
479         echo "$oldsha1" >> "$rewritten_pending"
480
481         case "$(peek_next_command)" in
482         squash|s|fixup|f)
483                 ;;
484         *)
485                 flush_rewritten_pending
486                 ;;
487         esac
488 }
489
490 do_pick () {
491         if test "$(git rev-parse HEAD)" = "$squash_onto"
492         then
493                 # Set the correct commit message and author info on the
494                 # sentinel root before cherry-picking the original changes
495                 # without committing (-n).  Finally, update the sentinel again
496                 # to include these changes.  If the cherry-pick results in a
497                 # conflict, this means our behaviour is similar to a standard
498                 # failed cherry-pick during rebase, with a dirty index to
499                 # resolve before manually running git commit --amend then git
500                 # rebase --continue.
501                 git commit --allow-empty --allow-empty-message --amend \
502                            --no-post-rewrite -n -q -C $1 &&
503                         pick_one -n $1 &&
504                         git commit --allow-empty --allow-empty-message \
505                                    --amend --no-post-rewrite -n -q -C $1 \
506                                    ${gpg_sign_opt:+"$gpg_sign_opt"} ||
507                         die_with_patch $1 "Could not apply $1... $2"
508         else
509                 pick_one $1 ||
510                         die_with_patch $1 "Could not apply $1... $2"
511         fi
512 }
513
514 do_next () {
515         rm -f "$msg" "$author_script" "$amend" "$state_dir"/stopped-sha || exit
516         read -r command sha1 rest < "$todo"
517         case "$command" in
518         "$comment_char"*|''|noop|drop|d)
519                 mark_action_done
520                 ;;
521         "$cr")
522                 # Work around CR left by "read" (e.g. with Git for Windows' Bash).
523                 mark_action_done
524                 ;;
525         pick|p)
526                 comment_for_reflog pick
527
528                 mark_action_done
529                 do_pick $sha1 "$rest"
530                 record_in_rewritten $sha1
531                 ;;
532         reword|r)
533                 comment_for_reflog reword
534
535                 mark_action_done
536                 do_pick $sha1 "$rest"
537                 git commit --amend --no-post-rewrite ${gpg_sign_opt:+"$gpg_sign_opt"} || {
538                         warn "Could not amend commit after successfully picking $sha1... $rest"
539                         warn "This is most likely due to an empty commit message, or the pre-commit hook"
540                         warn "failed. If the pre-commit hook failed, you may need to resolve the issue before"
541                         warn "you are able to reword the commit."
542                         exit_with_patch $sha1 1
543                 }
544                 record_in_rewritten $sha1
545                 ;;
546         edit|e)
547                 comment_for_reflog edit
548
549                 mark_action_done
550                 do_pick $sha1 "$rest"
551                 sha1_abbrev=$(git rev-parse --short $sha1)
552                 warn "Stopped at $sha1_abbrev... $rest"
553                 exit_with_patch $sha1 0
554                 ;;
555         squash|s|fixup|f)
556                 case "$command" in
557                 squash|s)
558                         squash_style=squash
559                         ;;
560                 fixup|f)
561                         squash_style=fixup
562                         ;;
563                 esac
564                 comment_for_reflog $squash_style
565
566                 test -f "$done" && has_action "$done" ||
567                         die "Cannot '$squash_style' without a previous commit"
568
569                 mark_action_done
570                 update_squash_messages $squash_style $sha1
571                 author_script_content=$(get_author_ident_from_commit HEAD)
572                 echo "$author_script_content" > "$author_script"
573                 eval "$author_script_content"
574                 if ! pick_one -n $sha1
575                 then
576                         git rev-parse --verify HEAD >"$amend"
577                         die_failed_squash $sha1 "$rest"
578                 fi
579                 case "$(peek_next_command)" in
580                 squash|s|fixup|f)
581                         # This is an intermediate commit; its message will only be
582                         # used in case of trouble.  So use the long version:
583                         do_with_author output git commit --amend --no-verify -F "$squash_msg" \
584                                 ${gpg_sign_opt:+"$gpg_sign_opt"} ||
585                                 die_failed_squash $sha1 "$rest"
586                         ;;
587                 *)
588                         # This is the final command of this squash/fixup group
589                         if test -f "$fixup_msg"
590                         then
591                                 do_with_author git commit --amend --no-verify -F "$fixup_msg" \
592                                         ${gpg_sign_opt:+"$gpg_sign_opt"} ||
593                                         die_failed_squash $sha1 "$rest"
594                         else
595                                 cp "$squash_msg" "$GIT_DIR"/SQUASH_MSG || exit
596                                 rm -f "$GIT_DIR"/MERGE_MSG
597                                 do_with_author git commit --amend --no-verify -F "$GIT_DIR"/SQUASH_MSG -e \
598                                         ${gpg_sign_opt:+"$gpg_sign_opt"} ||
599                                         die_failed_squash $sha1 "$rest"
600                         fi
601                         rm -f "$squash_msg" "$fixup_msg"
602                         ;;
603                 esac
604                 record_in_rewritten $sha1
605                 ;;
606         x|"exec")
607                 read -r command rest < "$todo"
608                 mark_action_done
609                 printf 'Executing: %s\n' "$rest"
610                 "${SHELL:-@SHELL_PATH@}" -c "$rest" # Actual execution
611                 status=$?
612                 # Run in subshell because require_clean_work_tree can die.
613                 dirty=f
614                 (require_clean_work_tree "rebase" 2>/dev/null) || dirty=t
615                 if test "$status" -ne 0
616                 then
617                         warn "Execution failed: $rest"
618                         test "$dirty" = f ||
619                         warn "and made changes to the index and/or the working tree"
620
621                         warn "You can fix the problem, and then run"
622                         warn
623                         warn "  git rebase --continue"
624                         warn
625                         if test $status -eq 127         # command not found
626                         then
627                                 status=1
628                         fi
629                         exit "$status"
630                 elif test "$dirty" = t
631                 then
632                         warn "Execution succeeded: $rest"
633                         warn "but left changes to the index and/or the working tree"
634                         warn "Commit or stash your changes, and then run"
635                         warn
636                         warn "  git rebase --continue"
637                         warn
638                         exit 1
639                 fi
640                 ;;
641         *)
642                 warn "Unknown command: $command $sha1 $rest"
643                 fixtodo="Please fix this using 'git rebase --edit-todo'."
644                 if git rev-parse --verify -q "$sha1" >/dev/null
645                 then
646                         die_with_patch $sha1 "$fixtodo"
647                 else
648                         die "$fixtodo"
649                 fi
650                 ;;
651         esac
652         test -s "$todo" && return
653
654         comment_for_reflog finish &&
655         newhead=$(git rev-parse HEAD) &&
656         case $head_name in
657         refs/*)
658                 message="$GIT_REFLOG_ACTION: $head_name onto $onto" &&
659                 git update-ref -m "$message" $head_name $newhead $orig_head &&
660                 git symbolic-ref \
661                   -m "$GIT_REFLOG_ACTION: returning to $head_name" \
662                   HEAD $head_name
663                 ;;
664         esac && {
665                 test ! -f "$state_dir"/verbose ||
666                         git diff-tree --stat $orig_head..HEAD
667         } &&
668         {
669                 test -s "$rewritten_list" &&
670                 git notes copy --for-rewrite=rebase < "$rewritten_list" ||
671                 true # we don't care if this copying failed
672         } &&
673         hook="$(git rev-parse --git-path hooks/post-rewrite)"
674         if test -x "$hook" && test -s "$rewritten_list"; then
675                 "$hook" rebase < "$rewritten_list"
676                 true # we don't care if this hook failed
677         fi &&
678         warn "Successfully rebased and updated $head_name."
679
680         return 1 # not failure; just to break the do_rest loop
681 }
682
683 # can only return 0, when the infinite loop breaks
684 do_rest () {
685         while :
686         do
687                 do_next || break
688         done
689 }
690
691 # skip picking commits whose parents are unchanged
692 skip_unnecessary_picks () {
693         fd=3
694         while read -r command rest
695         do
696                 # fd=3 means we skip the command
697                 case "$fd,$command" in
698                 3,pick|3,p)
699                         # pick a commit whose parent is current $onto -> skip
700                         sha1=${rest%% *}
701                         case "$(git rev-parse --verify --quiet "$sha1"^)" in
702                         "$onto"*)
703                                 onto=$sha1
704                                 ;;
705                         *)
706                                 fd=1
707                                 ;;
708                         esac
709                         ;;
710                 3,"$comment_char"*|3,)
711                         # copy comments
712                         ;;
713                 *)
714                         fd=1
715                         ;;
716                 esac
717                 printf '%s\n' "$command${rest:+ }$rest" >&$fd
718         done <"$todo" >"$todo.new" 3>>"$done" &&
719         mv -f "$todo".new "$todo" &&
720         case "$(peek_next_command)" in
721         squash|s|fixup|f)
722                 record_in_rewritten "$onto"
723                 ;;
724         esac ||
725         die "Could not skip unnecessary pick commands"
726 }
727
728 transform_todo_ids () {
729         while read -r command rest
730         do
731                 case "$command" in
732                 "$comment_char"* | exec)
733                         # Be careful for oddball commands like 'exec'
734                         # that do not have a SHA-1 at the beginning of $rest.
735                         ;;
736                 *)
737                         sha1=$(git rev-parse --verify --quiet "$@" ${rest%%[     ]*}) &&
738                         rest="$sha1 ${rest#*[    ]}"
739                         ;;
740                 esac
741                 printf '%s\n' "$command${rest:+ }$rest"
742         done <"$todo" >"$todo.new" &&
743         mv -f "$todo.new" "$todo"
744 }
745
746 expand_todo_ids() {
747         transform_todo_ids
748 }
749
750 collapse_todo_ids() {
751         transform_todo_ids --short
752 }
753
754 # Rearrange the todo list that has both "pick sha1 msg" and
755 # "pick sha1 fixup!/squash! msg" appears in it so that the latter
756 # comes immediately after the former, and change "pick" to
757 # "fixup"/"squash".
758 #
759 # Note that if the config has specified a custom instruction format
760 # each log message will be re-retrieved in order to normalize the
761 # autosquash arrangement
762 rearrange_squash () {
763         # extract fixup!/squash! lines and resolve any referenced sha1's
764         while read -r pick sha1 message
765         do
766                 test -z "${format}" || message=$(git log -n 1 --format="%s" ${sha1})
767                 case "$message" in
768                 "squash! "*|"fixup! "*)
769                         action="${message%%!*}"
770                         rest=$message
771                         prefix=
772                         # skip all squash! or fixup! (but save for later)
773                         while :
774                         do
775                                 case "$rest" in
776                                 "squash! "*|"fixup! "*)
777                                         prefix="$prefix${rest%%!*},"
778                                         rest="${rest#*! }"
779                                         ;;
780                                 *)
781                                         break
782                                         ;;
783                                 esac
784                         done
785                         printf '%s %s %s %s\n' "$sha1" "$action" "$prefix" "$rest"
786                         # if it's a single word, try to resolve to a full sha1 and
787                         # emit a second copy. This allows us to match on both message
788                         # and on sha1 prefix
789                         if test "${rest#* }" = "$rest"; then
790                                 fullsha="$(git rev-parse -q --verify "$rest" 2>/dev/null)"
791                                 if test -n "$fullsha"; then
792                                         # prefix the action to uniquely identify this line as
793                                         # intended for full sha1 match
794                                         echo "$sha1 +$action $prefix $fullsha"
795                                 fi
796                         fi
797                 esac
798         done >"$1.sq" <"$1"
799         test -s "$1.sq" || return
800
801         used=
802         while read -r pick sha1 message
803         do
804                 case " $used" in
805                 *" $sha1 "*) continue ;;
806                 esac
807                 printf '%s\n' "$pick $sha1 $message"
808                 test -z "${format}" || message=$(git log -n 1 --format="%s" ${sha1})
809                 used="$used$sha1 "
810                 while read -r squash action msg_prefix msg_content
811                 do
812                         case " $used" in
813                         *" $squash "*) continue ;;
814                         esac
815                         emit=0
816                         case "$action" in
817                         +*)
818                                 action="${action#+}"
819                                 # full sha1 prefix test
820                                 case "$msg_content" in "$sha1"*) emit=1;; esac ;;
821                         *)
822                                 # message prefix test
823                                 case "$message" in "$msg_content"*) emit=1;; esac ;;
824                         esac
825                         if test $emit = 1; then
826                                 if test -n "${format}"
827                                 then
828                                         msg_content=$(git log -n 1 --format="${format}" ${squash})
829                                 else
830                                         msg_content="$(echo "$msg_prefix" | sed "s/,/! /g")$msg_content"
831                                 fi
832                                 printf '%s\n' "$action $squash $msg_content"
833                                 used="$used$squash "
834                         fi
835                 done <"$1.sq"
836         done >"$1.rearranged" <"$1"
837         cat "$1.rearranged" >"$1"
838         rm -f "$1.sq" "$1.rearranged"
839 }
840
841 # Add commands after a pick or after a squash/fixup serie
842 # in the todo list.
843 add_exec_commands () {
844         {
845                 first=t
846                 while read -r insn rest
847                 do
848                         case $insn in
849                         pick)
850                                 test -n "$first" ||
851                                 printf "%s" "$cmd"
852                                 ;;
853                         esac
854                         printf "%s %s\n" "$insn" "$rest"
855                         first=
856                 done
857                 printf "%s" "$cmd"
858         } <"$1" >"$1.new" &&
859         mv "$1.new" "$1"
860 }
861
862 # Check if the SHA-1 passed as an argument is a
863 # correct one, if not then print $2 in "$todo".badsha
864 # $1: the SHA-1 to test
865 # $2: the line number of the input
866 # $3: the input filename
867 check_commit_sha () {
868         badsha=0
869         if test -z "$1"
870         then
871                 badsha=1
872         else
873                 sha1_verif="$(git rev-parse --verify --quiet $1^{commit})"
874                 if test -z "$sha1_verif"
875                 then
876                         badsha=1
877                 fi
878         fi
879
880         if test $badsha -ne 0
881         then
882                 line="$(sed -n -e "${2}p" "$3")"
883                 warn "Warning: the SHA-1 is missing or isn't" \
884                         "a commit in the following line:"
885                 warn " - $line"
886                 warn
887         fi
888
889         return $badsha
890 }
891
892 # prints the bad commits and bad commands
893 # from the todolist in stdin
894 check_bad_cmd_and_sha () {
895         retval=0
896         lineno=0
897         while read -r command rest
898         do
899                 lineno=$(( $lineno + 1 ))
900                 case $command in
901                 "$comment_char"*|''|noop|x|exec)
902                         # Doesn't expect a SHA-1
903                         ;;
904                 "$cr")
905                         # Work around CR left by "read" (e.g. with Git for
906                         # Windows' Bash).
907                         ;;
908                 pick|p|drop|d|reword|r|edit|e|squash|s|fixup|f)
909                         if ! check_commit_sha "${rest%%[        ]*}" "$lineno" "$1"
910                         then
911                                 retval=1
912                         fi
913                         ;;
914                 *)
915                         line="$(sed -n -e "${lineno}p" "$1")"
916                         warn "Warning: the command isn't recognized" \
917                                 "in the following line:"
918                         warn " - $line"
919                         warn
920                         retval=1
921                         ;;
922                 esac
923         done <"$1"
924         return $retval
925 }
926
927 # Print the list of the SHA-1 of the commits
928 # from stdin to stdout
929 todo_list_to_sha_list () {
930         git stripspace --strip-comments |
931         while read -r command sha1 rest
932         do
933                 case $command in
934                 "$comment_char"*|''|noop|x|"exec")
935                         ;;
936                 *)
937                         long_sha=$(git rev-list --no-walk "$sha1" 2>/dev/null)
938                         printf "%s\n" "$long_sha"
939                         ;;
940                 esac
941         done
942 }
943
944 # Use warn for each line in stdin
945 warn_lines () {
946         while read -r line
947         do
948                 warn " - $line"
949         done
950 }
951
952 # Switch to the branch in $into and notify it in the reflog
953 checkout_onto () {
954         GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $onto_name"
955         output git checkout $onto || die_abort "could not detach HEAD"
956         git update-ref ORIG_HEAD $orig_head
957 }
958
959 get_missing_commit_check_level () {
960         check_level=$(git config --get rebase.missingCommitsCheck)
961         check_level=${check_level:-ignore}
962         # Don't be case sensitive
963         printf '%s' "$check_level" | tr 'A-Z' 'a-z'
964 }
965
966 # Check if the user dropped some commits by mistake
967 # Behaviour determined by rebase.missingCommitsCheck.
968 # Check if there is an unrecognized command or a
969 # bad SHA-1 in a command.
970 check_todo_list () {
971         raise_error=f
972
973         check_level=$(get_missing_commit_check_level)
974
975         case "$check_level" in
976         warn|error)
977                 # Get the SHA-1 of the commits
978                 todo_list_to_sha_list <"$todo".backup >"$todo".oldsha1
979                 todo_list_to_sha_list <"$todo" >"$todo".newsha1
980
981                 # Sort the SHA-1 and compare them
982                 sort -u "$todo".oldsha1 >"$todo".oldsha1+
983                 mv "$todo".oldsha1+ "$todo".oldsha1
984                 sort -u "$todo".newsha1 >"$todo".newsha1+
985                 mv "$todo".newsha1+ "$todo".newsha1
986                 comm -2 -3 "$todo".oldsha1 "$todo".newsha1 >"$todo".miss
987
988                 # Warn about missing commits
989                 if test -s "$todo".miss
990                 then
991                         test "$check_level" = error && raise_error=t
992
993                         warn "Warning: some commits may have been dropped" \
994                                 "accidentally."
995                         warn "Dropped commits (newer to older):"
996
997                         # Make the list user-friendly and display
998                         opt="--no-walk=sorted --format=oneline --abbrev-commit --stdin"
999                         git rev-list $opt <"$todo".miss | warn_lines
1000
1001                         warn "To avoid this message, use \"drop\" to" \
1002                                 "explicitly remove a commit."
1003                         warn
1004                         warn "Use 'git config rebase.missingCommitsCheck' to change" \
1005                                 "the level of warnings."
1006                         warn "The possible behaviours are: ignore, warn, error."
1007                         warn
1008                 fi
1009                 ;;
1010         ignore)
1011                 ;;
1012         *)
1013                 warn "Unrecognized setting $check_level for option" \
1014                         "rebase.missingCommitsCheck. Ignoring."
1015                 ;;
1016         esac
1017
1018         if ! check_bad_cmd_and_sha "$todo"
1019         then
1020                 raise_error=t
1021         fi
1022
1023         if test $raise_error = t
1024         then
1025                 # Checkout before the first commit of the
1026                 # rebase: this way git rebase --continue
1027                 # will work correctly as it expects HEAD to be
1028                 # placed before the commit of the next action
1029                 checkout_onto
1030
1031                 warn "You can fix this with 'git rebase --edit-todo'."
1032                 die "Or you can abort the rebase with 'git rebase --abort'."
1033         fi
1034 }
1035
1036 # The whole contents of this file is run by dot-sourcing it from
1037 # inside a shell function.  It used to be that "return"s we see
1038 # below were not inside any function, and expected to return
1039 # to the function that dot-sourced us.
1040 #
1041 # However, FreeBSD /bin/sh misbehaves on such a construct and
1042 # continues to run the statements that follow such a "return".
1043 # As a work-around, we introduce an extra layer of a function
1044 # here, and immediately call it after defining it.
1045 git_rebase__interactive () {
1046
1047 case "$action" in
1048 continue)
1049         # do we have anything to commit?
1050         if git diff-index --cached --quiet HEAD --
1051         then
1052                 # Nothing to commit -- skip this commit
1053
1054                 test ! -f "$GIT_DIR"/CHERRY_PICK_HEAD ||
1055                 rm "$GIT_DIR"/CHERRY_PICK_HEAD ||
1056                 die "Could not remove CHERRY_PICK_HEAD"
1057         else
1058                 if ! test -f "$author_script"
1059                 then
1060                         gpg_sign_opt_quoted=${gpg_sign_opt:+$(git rev-parse --sq-quote "$gpg_sign_opt")}
1061                         die "You have staged changes in your working tree. If these changes are meant to be
1062 squashed into the previous commit, run:
1063
1064   git commit --amend $gpg_sign_opt_quoted
1065
1066 If they are meant to go into a new commit, run:
1067
1068   git commit $gpg_sign_opt_quoted
1069
1070 In both case, once you're done, continue with:
1071
1072   git rebase --continue
1073 "
1074                 fi
1075                 . "$author_script" ||
1076                         die "Error trying to find the author identity to amend commit"
1077                 if test -f "$amend"
1078                 then
1079                         current_head=$(git rev-parse --verify HEAD)
1080                         test "$current_head" = $(cat "$amend") ||
1081                         die "\
1082 You have uncommitted changes in your working tree. Please, commit them
1083 first and then run 'git rebase --continue' again."
1084                         do_with_author git commit --amend --no-verify -F "$msg" -e \
1085                                 ${gpg_sign_opt:+"$gpg_sign_opt"} ||
1086                                 die "Could not commit staged changes."
1087                 else
1088                         do_with_author git commit --no-verify -F "$msg" -e \
1089                                 ${gpg_sign_opt:+"$gpg_sign_opt"} ||
1090                                 die "Could not commit staged changes."
1091                 fi
1092         fi
1093
1094         if test -r "$state_dir"/stopped-sha
1095         then
1096                 record_in_rewritten "$(cat "$state_dir"/stopped-sha)"
1097         fi
1098
1099         require_clean_work_tree "rebase"
1100         do_rest
1101         return 0
1102         ;;
1103 skip)
1104         git rerere clear
1105
1106         do_rest
1107         return 0
1108         ;;
1109 edit-todo)
1110         git stripspace --strip-comments <"$todo" >"$todo".new
1111         mv -f "$todo".new "$todo"
1112         collapse_todo_ids
1113         append_todo_help
1114         git stripspace --comment-lines >>"$todo" <<\EOF
1115
1116 You are editing the todo file of an ongoing interactive rebase.
1117 To continue rebase after editing, run:
1118     git rebase --continue
1119
1120 EOF
1121
1122         git_sequence_editor "$todo" ||
1123                 die "Could not execute editor"
1124         expand_todo_ids
1125
1126         exit
1127         ;;
1128 esac
1129
1130 git var GIT_COMMITTER_IDENT >/dev/null ||
1131         die "You need to set your committer info first"
1132
1133 comment_for_reflog start
1134
1135 if test ! -z "$switch_to"
1136 then
1137         GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $switch_to"
1138         output git checkout "$switch_to" -- ||
1139         die "Could not checkout $switch_to"
1140
1141         comment_for_reflog start
1142 fi
1143
1144 orig_head=$(git rev-parse --verify HEAD) || die "No HEAD?"
1145 mkdir -p "$state_dir" || die "Could not create temporary $state_dir"
1146
1147 : > "$state_dir"/interactive || die "Could not mark as interactive"
1148 write_basic_state
1149 if test t = "$preserve_merges"
1150 then
1151         if test -z "$rebase_root"
1152         then
1153                 mkdir "$rewritten" &&
1154                 for c in $(git merge-base --all $orig_head $upstream)
1155                 do
1156                         echo $onto > "$rewritten"/$c ||
1157                                 die "Could not init rewritten commits"
1158                 done
1159         else
1160                 mkdir "$rewritten" &&
1161                 echo $onto > "$rewritten"/root ||
1162                         die "Could not init rewritten commits"
1163         fi
1164         # No cherry-pick because our first pass is to determine
1165         # parents to rewrite and skipping dropped commits would
1166         # prematurely end our probe
1167         merges_option=
1168 else
1169         merges_option="--no-merges --cherry-pick"
1170 fi
1171
1172 shorthead=$(git rev-parse --short $orig_head)
1173 shortonto=$(git rev-parse --short $onto)
1174 if test -z "$rebase_root"
1175         # this is now equivalent to ! -z "$upstream"
1176 then
1177         shortupstream=$(git rev-parse --short $upstream)
1178         revisions=$upstream...$orig_head
1179         shortrevisions=$shortupstream..$shorthead
1180 else
1181         revisions=$onto...$orig_head
1182         shortrevisions=$shorthead
1183 fi
1184 format=$(git config --get rebase.instructionFormat)
1185 # the 'rev-list .. | sed' requires %m to parse; the instruction requires %H to parse
1186 git rev-list $merges_option --format="%m%H ${format:-%s}" \
1187         --reverse --left-right --topo-order \
1188         $revisions ${restrict_revision+^$restrict_revision} | \
1189         sed -n "s/^>//p" |
1190 while read -r sha1 rest
1191 do
1192
1193         if test -z "$keep_empty" && is_empty_commit $sha1 && ! is_merge_commit $sha1
1194         then
1195                 comment_out="$comment_char "
1196         else
1197                 comment_out=
1198         fi
1199
1200         if test t != "$preserve_merges"
1201         then
1202                 printf '%s\n' "${comment_out}pick $sha1 $rest" >>"$todo"
1203         else
1204                 if test -z "$rebase_root"
1205                 then
1206                         preserve=t
1207                         for p in $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)
1208                         do
1209                                 if test -f "$rewritten"/$p
1210                                 then
1211                                         preserve=f
1212                                 fi
1213                         done
1214                 else
1215                         preserve=f
1216                 fi
1217                 if test f = "$preserve"
1218                 then
1219                         touch "$rewritten"/$sha1
1220                         printf '%s\n' "${comment_out}pick $sha1 $rest" >>"$todo"
1221                 fi
1222         fi
1223 done
1224
1225 # Watch for commits that been dropped by --cherry-pick
1226 if test t = "$preserve_merges"
1227 then
1228         mkdir "$dropped"
1229         # Save all non-cherry-picked changes
1230         git rev-list $revisions --left-right --cherry-pick | \
1231                 sed -n "s/^>//p" > "$state_dir"/not-cherry-picks
1232         # Now all commits and note which ones are missing in
1233         # not-cherry-picks and hence being dropped
1234         git rev-list $revisions |
1235         while read rev
1236         do
1237                 if test -f "$rewritten"/$rev &&
1238                    ! sane_grep "$rev" "$state_dir"/not-cherry-picks >/dev/null
1239                 then
1240                         # Use -f2 because if rev-list is telling us this commit is
1241                         # not worthwhile, we don't want to track its multiple heads,
1242                         # just the history of its first-parent for others that will
1243                         # be rebasing on top of it
1244                         git rev-list --parents -1 $rev | cut -d' ' -s -f2 > "$dropped"/$rev
1245                         sha1=$(git rev-list -1 $rev)
1246                         sane_grep -v "^[a-z][a-z]* $sha1" <"$todo" > "${todo}2" ; mv "${todo}2" "$todo"
1247                         rm "$rewritten"/$rev
1248                 fi
1249         done
1250 fi
1251
1252 test -s "$todo" || echo noop >> "$todo"
1253 test -n "$autosquash" && rearrange_squash "$todo"
1254 test -n "$cmd" && add_exec_commands "$todo"
1255
1256 todocount=$(git stripspace --strip-comments <"$todo" | wc -l)
1257 todocount=${todocount##* }
1258
1259 cat >>"$todo" <<EOF
1260
1261 $comment_char Rebase $shortrevisions onto $shortonto ($todocount command(s))
1262 EOF
1263 append_todo_help
1264 git stripspace --comment-lines >>"$todo" <<\EOF
1265
1266 However, if you remove everything, the rebase will be aborted.
1267
1268 EOF
1269
1270 if test -z "$keep_empty"
1271 then
1272         printf '%s\n' "$comment_char Note that empty commits are commented out" >>"$todo"
1273 fi
1274
1275
1276 has_action "$todo" ||
1277         return 2
1278
1279 cp "$todo" "$todo".backup
1280 collapse_todo_ids
1281 git_sequence_editor "$todo" ||
1282         die_abort "Could not execute editor"
1283
1284 has_action "$todo" ||
1285         return 2
1286
1287 check_todo_list
1288
1289 expand_todo_ids
1290
1291 test -d "$rewritten" || test -n "$force_rebase" || skip_unnecessary_picks
1292
1293 checkout_onto
1294 do_rest
1295
1296 }
1297 # ... and then we call the whole thing.
1298 git_rebase__interactive