sha1_file: convert sha1_object_info* to object_id
[git] / git-rebase.sh
1 #!/bin/sh
2 #
3 # Copyright (c) 2005 Junio C Hamano.
4 #
5
6 SUBDIRECTORY_OK=Yes
7 OPTIONS_KEEPDASHDASH=
8 OPTIONS_STUCKLONG=t
9 OPTIONS_SPEC="\
10 git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] [<upstream>] [<branch>]
11 git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] --root [<branch>]
12 git rebase --continue | --abort | --skip | --edit-todo
13 --
14  Available options are
15 v,verbose!         display a diffstat of what changed upstream
16 q,quiet!           be quiet. implies --no-stat
17 autostash          automatically stash/stash pop before and after
18 fork-point         use 'merge-base --fork-point' to refine upstream
19 onto=!             rebase onto given branch instead of upstream
20 p,preserve-merges! try to recreate merges instead of ignoring them
21 s,strategy=!       use the given merge strategy
22 no-ff!             cherry-pick all commits, even if unchanged
23 m,merge!           use merging strategies to rebase
24 i,interactive!     let the user edit the list of commits to rebase
25 x,exec=!           add exec lines after each commit of the editable list
26 k,keep-empty       preserve empty commits during rebase
27 allow-empty-message allow rebasing commits with empty messages
28 f,force-rebase!    force rebase even if branch is up to date
29 X,strategy-option=! pass the argument through to the merge strategy
30 stat!              display a diffstat of what changed upstream
31 n,no-stat!         do not show diffstat of what changed upstream
32 verify             allow pre-rebase hook to run
33 rerere-autoupdate  allow rerere to update index with resolved conflicts
34 root!              rebase all reachable commits up to the root(s)
35 autosquash         move commits that begin with squash!/fixup! under -i
36 committer-date-is-author-date! passed to 'git am'
37 ignore-date!       passed to 'git am'
38 signoff            passed to 'git am'
39 whitespace=!       passed to 'git apply'
40 ignore-whitespace! passed to 'git apply'
41 C=!                passed to 'git apply'
42 S,gpg-sign?        GPG-sign commits
43  Actions:
44 continue!          continue
45 abort!             abort and check out the original branch
46 skip!              skip current patch and continue
47 edit-todo!         edit the todo list during an interactive rebase
48 quit!              abort but keep HEAD where it is
49 show-current-patch! show the patch file being applied or merged
50 "
51 . git-sh-setup
52 set_reflog_action rebase
53 require_work_tree_exists
54 cd_to_toplevel
55
56 LF='
57 '
58 ok_to_skip_pre_rebase=
59 resolvemsg="
60 $(gettext 'Resolve all conflicts manually, mark them as resolved with
61 "git add/rm <conflicted_files>", then run "git rebase --continue".
62 You can instead skip this commit: run "git rebase --skip".
63 To abort and get back to the state before "git rebase", run "git rebase --abort".')
64 "
65 unset onto
66 unset restrict_revision
67 cmd=
68 strategy=
69 strategy_opts=
70 do_merge=
71 merge_dir="$GIT_DIR"/rebase-merge
72 apply_dir="$GIT_DIR"/rebase-apply
73 verbose=
74 diffstat=
75 test "$(git config --bool rebase.stat)" = true && diffstat=t
76 autostash="$(git config --bool rebase.autostash || echo false)"
77 fork_point=auto
78 git_am_opt=
79 git_format_patch_opt=
80 rebase_root=
81 force_rebase=
82 allow_rerere_autoupdate=
83 # Non-empty if a rebase was in progress when 'git rebase' was invoked
84 in_progress=
85 # One of {am, merge, interactive}
86 type=
87 # One of {"$GIT_DIR"/rebase-apply, "$GIT_DIR"/rebase-merge}
88 state_dir=
89 # One of {'', continue, skip, abort}, as parsed from command line
90 action=
91 preserve_merges=
92 autosquash=
93 keep_empty=
94 allow_empty_message=
95 test "$(git config --bool rebase.autosquash)" = "true" && autosquash=t
96 case "$(git config --bool commit.gpgsign)" in
97 true)   gpg_sign_opt=-S ;;
98 *)      gpg_sign_opt= ;;
99 esac
100
101 read_basic_state () {
102         test -f "$state_dir/head-name" &&
103         test -f "$state_dir/onto" &&
104         head_name=$(cat "$state_dir"/head-name) &&
105         onto=$(cat "$state_dir"/onto) &&
106         # We always write to orig-head, but interactive rebase used to write to
107         # head. Fall back to reading from head to cover for the case that the
108         # user upgraded git with an ongoing interactive rebase.
109         if test -f "$state_dir"/orig-head
110         then
111                 orig_head=$(cat "$state_dir"/orig-head)
112         else
113                 orig_head=$(cat "$state_dir"/head)
114         fi &&
115         GIT_QUIET=$(cat "$state_dir"/quiet) &&
116         test -f "$state_dir"/verbose && verbose=t
117         test -f "$state_dir"/strategy && strategy="$(cat "$state_dir"/strategy)"
118         test -f "$state_dir"/strategy_opts &&
119                 strategy_opts="$(cat "$state_dir"/strategy_opts)"
120         test -f "$state_dir"/allow_rerere_autoupdate &&
121                 allow_rerere_autoupdate="$(cat "$state_dir"/allow_rerere_autoupdate)"
122         test -f "$state_dir"/gpg_sign_opt &&
123                 gpg_sign_opt="$(cat "$state_dir"/gpg_sign_opt)"
124 }
125
126 write_basic_state () {
127         echo "$head_name" > "$state_dir"/head-name &&
128         echo "$onto" > "$state_dir"/onto &&
129         echo "$orig_head" > "$state_dir"/orig-head &&
130         echo "$GIT_QUIET" > "$state_dir"/quiet &&
131         test t = "$verbose" && : > "$state_dir"/verbose
132         test -n "$strategy" && echo "$strategy" > "$state_dir"/strategy
133         test -n "$strategy_opts" && echo "$strategy_opts" > \
134                 "$state_dir"/strategy_opts
135         test -n "$allow_rerere_autoupdate" && echo "$allow_rerere_autoupdate" > \
136                 "$state_dir"/allow_rerere_autoupdate
137         test -n "$gpg_sign_opt" && echo "$gpg_sign_opt" > "$state_dir"/gpg_sign_opt
138 }
139
140 output () {
141         case "$verbose" in
142         '')
143                 output=$("$@" 2>&1 )
144                 status=$?
145                 test $status != 0 && printf "%s\n" "$output"
146                 return $status
147                 ;;
148         *)
149                 "$@"
150                 ;;
151         esac
152 }
153
154 move_to_original_branch () {
155         case "$head_name" in
156         refs/*)
157                 message="rebase finished: $head_name onto $onto"
158                 git update-ref -m "$message" \
159                         $head_name $(git rev-parse HEAD) $orig_head &&
160                 git symbolic-ref \
161                         -m "rebase finished: returning to $head_name" \
162                         HEAD $head_name ||
163                 die "$(eval_gettext "Could not move back to \$head_name")"
164                 ;;
165         esac
166 }
167
168 apply_autostash () {
169         if test -f "$state_dir/autostash"
170         then
171                 stash_sha1=$(cat "$state_dir/autostash")
172                 if git stash apply $stash_sha1 >/dev/null 2>&1
173                 then
174                         echo "$(gettext 'Applied autostash.')" >&2
175                 else
176                         git stash store -m "autostash" -q $stash_sha1 ||
177                         die "$(eval_gettext "Cannot store \$stash_sha1")"
178                         gettext 'Applying autostash resulted in conflicts.
179 Your changes are safe in the stash.
180 You can run "git stash pop" or "git stash drop" at any time.
181 ' >&2
182                 fi
183         fi
184 }
185
186 finish_rebase () {
187         rm -f "$(git rev-parse --git-path REBASE_HEAD)"
188         apply_autostash &&
189         { git gc --auto || true; } &&
190         rm -rf "$state_dir"
191 }
192
193 run_specific_rebase () {
194         if [ "$interactive_rebase" = implied ]; then
195                 GIT_EDITOR=:
196                 export GIT_EDITOR
197                 autosquash=
198         fi
199         . git-rebase--$type
200         ret=$?
201         if test $ret -eq 0
202         then
203                 finish_rebase
204         elif test $ret -eq 2 # special exit status for rebase -i
205         then
206                 apply_autostash &&
207                 rm -rf "$state_dir" &&
208                 die "Nothing to do"
209         fi
210         exit $ret
211 }
212
213 run_pre_rebase_hook () {
214         if test -z "$ok_to_skip_pre_rebase" &&
215            test -x "$(git rev-parse --git-path hooks/pre-rebase)"
216         then
217                 "$(git rev-parse --git-path hooks/pre-rebase)" ${1+"$@"} ||
218                 die "$(gettext "The pre-rebase hook refused to rebase.")"
219         fi
220 }
221
222 test -f "$apply_dir"/applying &&
223         die "$(gettext "It looks like 'git am' is in progress. Cannot rebase.")"
224
225 if test -d "$apply_dir"
226 then
227         type=am
228         state_dir="$apply_dir"
229 elif test -d "$merge_dir"
230 then
231         if test -f "$merge_dir"/interactive
232         then
233                 type=interactive
234                 interactive_rebase=explicit
235         else
236                 type=merge
237         fi
238         state_dir="$merge_dir"
239 fi
240 test -n "$type" && in_progress=t
241
242 total_argc=$#
243 while test $# != 0
244 do
245         case "$1" in
246         --no-verify)
247                 ok_to_skip_pre_rebase=yes
248                 ;;
249         --verify)
250                 ok_to_skip_pre_rebase=
251                 ;;
252         --continue|--skip|--abort|--quit|--edit-todo|--show-current-patch)
253                 test $total_argc -eq 2 || usage
254                 action=${1##--}
255                 ;;
256         --onto=*)
257                 onto="${1#--onto=}"
258                 ;;
259         --exec=*)
260                 cmd="${cmd}exec ${1#--exec=}${LF}"
261                 test -z "$interactive_rebase" && interactive_rebase=implied
262                 ;;
263         --interactive)
264                 interactive_rebase=explicit
265                 ;;
266         --keep-empty)
267                 keep_empty=yes
268                 ;;
269         --allow-empty-message)
270                 allow_empty_message=--allow-empty-message
271                 ;;
272         --preserve-merges)
273                 preserve_merges=t
274                 test -z "$interactive_rebase" && interactive_rebase=implied
275                 ;;
276         --autosquash)
277                 autosquash=t
278                 ;;
279         --no-autosquash)
280                 autosquash=
281                 ;;
282         --fork-point)
283                 fork_point=t
284                 ;;
285         --no-fork-point)
286                 fork_point=
287                 ;;
288         --merge)
289                 do_merge=t
290                 ;;
291         --strategy-option=*)
292                 strategy_opts="$strategy_opts $(git rev-parse --sq-quote "--${1#--strategy-option=}")"
293                 do_merge=t
294                 test -z "$strategy" && strategy=recursive
295                 ;;
296         --strategy=*)
297                 strategy="${1#--strategy=}"
298                 do_merge=t
299                 ;;
300         --no-stat)
301                 diffstat=
302                 ;;
303         --stat)
304                 diffstat=t
305                 ;;
306         --autostash)
307                 autostash=true
308                 ;;
309         --no-autostash)
310                 autostash=false
311                 ;;
312         --verbose)
313                 verbose=t
314                 diffstat=t
315                 GIT_QUIET=
316                 ;;
317         --quiet)
318                 GIT_QUIET=t
319                 git_am_opt="$git_am_opt -q"
320                 verbose=
321                 diffstat=
322                 ;;
323         --whitespace=*)
324                 git_am_opt="$git_am_opt --whitespace=${1#--whitespace=}"
325                 case "${1#--whitespace=}" in
326                 fix|strip)
327                         force_rebase=t
328                         ;;
329                 esac
330                 ;;
331         --ignore-whitespace)
332                 git_am_opt="$git_am_opt $1"
333                 ;;
334         --committer-date-is-author-date|--ignore-date|--signoff|--no-signoff)
335                 git_am_opt="$git_am_opt $1"
336                 force_rebase=t
337                 ;;
338         -C*)
339                 git_am_opt="$git_am_opt $1"
340                 ;;
341         --root)
342                 rebase_root=t
343                 ;;
344         --force-rebase|--no-ff)
345                 force_rebase=t
346                 ;;
347         --rerere-autoupdate|--no-rerere-autoupdate)
348                 allow_rerere_autoupdate="$1"
349                 ;;
350         --gpg-sign)
351                 gpg_sign_opt=-S
352                 ;;
353         --gpg-sign=*)
354                 gpg_sign_opt="-S${1#--gpg-sign=}"
355                 ;;
356         --)
357                 shift
358                 break
359                 ;;
360         *)
361                 usage
362                 ;;
363         esac
364         shift
365 done
366 test $# -gt 2 && usage
367
368 if test -n "$action"
369 then
370         test -z "$in_progress" && die "$(gettext "No rebase in progress?")"
371         # Only interactive rebase uses detailed reflog messages
372         if test "$type" = interactive && test "$GIT_REFLOG_ACTION" = rebase
373         then
374                 GIT_REFLOG_ACTION="rebase -i ($action)"
375                 export GIT_REFLOG_ACTION
376         fi
377 fi
378
379 if test "$action" = "edit-todo" && test "$type" != "interactive"
380 then
381         die "$(gettext "The --edit-todo action can only be used during interactive rebase.")"
382 fi
383
384 case "$action" in
385 continue)
386         # Sanity check
387         git rev-parse --verify HEAD >/dev/null ||
388                 die "$(gettext "Cannot read HEAD")"
389         git update-index --ignore-submodules --refresh &&
390         git diff-files --quiet --ignore-submodules || {
391                 echo "$(gettext "You must edit all merge conflicts and then
392 mark them as resolved using git add")"
393                 exit 1
394         }
395         read_basic_state
396         run_specific_rebase
397         ;;
398 skip)
399         output git reset --hard HEAD || exit $?
400         read_basic_state
401         run_specific_rebase
402         ;;
403 abort)
404         git rerere clear
405         read_basic_state
406         case "$head_name" in
407         refs/*)
408                 git symbolic-ref -m "rebase: aborting" HEAD $head_name ||
409                 die "$(eval_gettext "Could not move back to \$head_name")"
410                 ;;
411         esac
412         output git reset --hard $orig_head
413         finish_rebase
414         exit
415         ;;
416 quit)
417         exec rm -rf "$state_dir"
418         ;;
419 edit-todo)
420         run_specific_rebase
421         ;;
422 show-current-patch)
423         run_specific_rebase
424         die "BUG: run_specific_rebase is not supposed to return here"
425         ;;
426 esac
427
428 # Make sure no rebase is in progress
429 if test -n "$in_progress"
430 then
431         state_dir_base=${state_dir##*/}
432         cmd_live_rebase="git rebase (--continue | --abort | --skip)"
433         cmd_clear_stale_rebase="rm -fr \"$state_dir\""
434         die "
435 $(eval_gettext 'It seems that there is already a $state_dir_base directory, and
436 I wonder if you are in the middle of another rebase.  If that is the
437 case, please try
438         $cmd_live_rebase
439 If that is not the case, please
440         $cmd_clear_stale_rebase
441 and run me again.  I am stopping in case you still have something
442 valuable there.')"
443 fi
444
445 if test -n "$rebase_root" && test -z "$onto"
446 then
447         test -z "$interactive_rebase" && interactive_rebase=implied
448 fi
449
450 if test -n "$interactive_rebase"
451 then
452         type=interactive
453         state_dir="$merge_dir"
454 elif test -n "$do_merge"
455 then
456         type=merge
457         state_dir="$merge_dir"
458 else
459         type=am
460         state_dir="$apply_dir"
461 fi
462
463 if test -t 2 && test -z "$GIT_QUIET"
464 then
465         git_format_patch_opt="$git_format_patch_opt --progress"
466 fi
467
468 if test -z "$rebase_root"
469 then
470         case "$#" in
471         0)
472                 if ! upstream_name=$(git rev-parse --symbolic-full-name \
473                         --verify -q @{upstream} 2>/dev/null)
474                 then
475                         . git-parse-remote
476                         error_on_missing_default_upstream "rebase" "rebase" \
477                                 "against" "git rebase $(gettext '<branch>')"
478                 fi
479
480                 test "$fork_point" = auto && fork_point=t
481                 ;;
482         *)      upstream_name="$1"
483                 if test "$upstream_name" = "-"
484                 then
485                         upstream_name="@{-1}"
486                 fi
487                 shift
488                 ;;
489         esac
490         upstream=$(peel_committish "${upstream_name}") ||
491         die "$(eval_gettext "invalid upstream '\$upstream_name'")"
492         upstream_arg="$upstream_name"
493 else
494         if test -z "$onto"
495         then
496                 empty_tree=$(git hash-object -t tree /dev/null)
497                 onto=$(git commit-tree $empty_tree </dev/null)
498                 squash_onto="$onto"
499         fi
500         unset upstream_name
501         unset upstream
502         test $# -gt 1 && usage
503         upstream_arg=--root
504 fi
505
506 # Make sure the branch to rebase onto is valid.
507 onto_name=${onto-"$upstream_name"}
508 case "$onto_name" in
509 *...*)
510         if      left=${onto_name%...*} right=${onto_name#*...} &&
511                 onto=$(git merge-base --all ${left:-HEAD} ${right:-HEAD})
512         then
513                 case "$onto" in
514                 ?*"$LF"?*)
515                         die "$(eval_gettext "\$onto_name: there are more than one merge bases")"
516                         ;;
517                 '')
518                         die "$(eval_gettext "\$onto_name: there is no merge base")"
519                         ;;
520                 esac
521         else
522                 die "$(eval_gettext "\$onto_name: there is no merge base")"
523         fi
524         ;;
525 *)
526         onto=$(peel_committish "$onto_name") ||
527         die "$(eval_gettext "Does not point to a valid commit: \$onto_name")"
528         ;;
529 esac
530
531 # If the branch to rebase is given, that is the branch we will rebase
532 # $branch_name -- branch/commit being rebased, or HEAD (already detached)
533 # $orig_head -- commit object name of tip of the branch before rebasing
534 # $head_name -- refs/heads/<that-branch> or "detached HEAD"
535 switch_to=
536 case "$#" in
537 1)
538         # Is it "rebase other $branchname" or "rebase other $commit"?
539         branch_name="$1"
540         switch_to="$1"
541
542         # Is it a local branch?
543         if git show-ref --verify --quiet -- "refs/heads/$branch_name" &&
544            orig_head=$(git rev-parse -q --verify "refs/heads/$branch_name")
545         then
546                 head_name="refs/heads/$branch_name"
547         # If not is it a valid ref (branch or commit)?
548         elif orig_head=$(git rev-parse -q --verify "$branch_name")
549         then
550                 head_name="detached HEAD"
551
552         else
553                 die "$(eval_gettext "fatal: no such branch/commit '\$branch_name'")"
554         fi
555         ;;
556 0)
557         # Do not need to switch branches, we are already on it.
558         if branch_name=$(git symbolic-ref -q HEAD)
559         then
560                 head_name=$branch_name
561                 branch_name=$(expr "z$branch_name" : 'zrefs/heads/\(.*\)')
562         else
563                 head_name="detached HEAD"
564                 branch_name=HEAD
565         fi
566         orig_head=$(git rev-parse --verify HEAD) || exit
567         ;;
568 *)
569         die "BUG: unexpected number of arguments left to parse"
570         ;;
571 esac
572
573 if test "$fork_point" = t
574 then
575         new_upstream=$(git merge-base --fork-point "$upstream_name" \
576                         "${switch_to:-HEAD}")
577         if test -n "$new_upstream"
578         then
579                 restrict_revision=$new_upstream
580         fi
581 fi
582
583 if test "$autostash" = true && ! (require_clean_work_tree) 2>/dev/null
584 then
585         stash_sha1=$(git stash create "autostash") ||
586         die "$(gettext 'Cannot autostash')"
587
588         mkdir -p "$state_dir" &&
589         echo $stash_sha1 >"$state_dir/autostash" &&
590         stash_abbrev=$(git rev-parse --short $stash_sha1) &&
591         echo "$(eval_gettext 'Created autostash: $stash_abbrev')" &&
592         git reset --hard
593 fi
594
595 require_clean_work_tree "rebase" "$(gettext "Please commit or stash them.")"
596
597 # Now we are rebasing commits $upstream..$orig_head (or with --root,
598 # everything leading up to $orig_head) on top of $onto
599
600 # Check if we are already based on $onto with linear history,
601 # but this should be done only when upstream and onto are the same
602 # and if this is not an interactive rebase.
603 mb=$(git merge-base "$onto" "$orig_head")
604 if test "$type" != interactive && test "$upstream" = "$onto" &&
605         test "$mb" = "$onto" && test -z "$restrict_revision" &&
606         # linear history?
607         ! (git rev-list --parents "$onto".."$orig_head" | sane_grep " .* ") > /dev/null
608 then
609         if test -z "$force_rebase"
610         then
611                 # Lazily switch to the target branch if needed...
612                 test -z "$switch_to" ||
613                 GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $switch_to" \
614                         git checkout -q "$switch_to" --
615                 if test "$branch_name" = "HEAD" &&
616                          ! git symbolic-ref -q HEAD
617                 then
618                         say "$(eval_gettext "HEAD is up to date.")"
619                 else
620                         say "$(eval_gettext "Current branch \$branch_name is up to date.")"
621                 fi
622                 finish_rebase
623                 exit 0
624         else
625                 if test "$branch_name" = "HEAD" &&
626                          ! git symbolic-ref -q HEAD
627                 then
628                         say "$(eval_gettext "HEAD is up to date, rebase forced.")"
629                 else
630                         say "$(eval_gettext "Current branch \$branch_name is up to date, rebase forced.")"
631                 fi
632         fi
633 fi
634
635 # If a hook exists, give it a chance to interrupt
636 run_pre_rebase_hook "$upstream_arg" "$@"
637
638 if test -n "$diffstat"
639 then
640         if test -n "$verbose"
641         then
642                 echo "$(eval_gettext "Changes from \$mb to \$onto:")"
643         fi
644         # We want color (if set), but no pager
645         GIT_PAGER='' git diff --stat --summary "$mb" "$onto"
646 fi
647
648 test "$type" = interactive && run_specific_rebase
649
650 # Detach HEAD and reset the tree
651 say "$(gettext "First, rewinding head to replay your work on top of it...")"
652
653 GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $onto_name" \
654         git checkout -q "$onto^0" || die "could not detach HEAD"
655 git update-ref ORIG_HEAD $orig_head
656
657 # If the $onto is a proper descendant of the tip of the branch, then
658 # we just fast-forwarded.
659 if test "$mb" = "$orig_head"
660 then
661         say "$(eval_gettext "Fast-forwarded \$branch_name to \$onto_name.")"
662         move_to_original_branch
663         finish_rebase
664         exit 0
665 fi
666
667 if test -n "$rebase_root"
668 then
669         revisions="$onto..$orig_head"
670 else
671         revisions="${restrict_revision-$upstream}..$orig_head"
672 fi
673
674 run_specific_rebase