Merge branch 'sb/clone-shallow-passthru'
[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 f,force-rebase!    force rebase even if branch is up to date
28 X,strategy-option=! pass the argument through to the merge strategy
29 stat!              display a diffstat of what changed upstream
30 n,no-stat!         do not show diffstat of what changed upstream
31 verify             allow pre-rebase hook to run
32 rerere-autoupdate  allow rerere to update index with resolved conflicts
33 root!              rebase all reachable commits up to the root(s)
34 autosquash         move commits that begin with squash!/fixup! under -i
35 committer-date-is-author-date! passed to 'git am'
36 ignore-date!       passed to 'git am'
37 whitespace=!       passed to 'git apply'
38 ignore-whitespace! passed to 'git apply'
39 C=!                passed to 'git apply'
40 S,gpg-sign?        GPG-sign commits
41  Actions:
42 continue!          continue
43 abort!             abort and check out the original branch
44 skip!              skip current patch and continue
45 edit-todo!         edit the todo list during an interactive rebase
46 "
47 . git-sh-setup
48 . git-sh-i18n
49 set_reflog_action rebase
50 require_work_tree_exists
51 cd_to_toplevel
52
53 LF='
54 '
55 ok_to_skip_pre_rebase=
56 resolvemsg="
57 $(gettext 'When you have resolved this problem, run "git rebase --continue".
58 If you prefer to skip this patch, run "git rebase --skip" instead.
59 To check out the original branch and stop rebasing, run "git rebase --abort".')
60 "
61 unset onto
62 unset restrict_revision
63 cmd=
64 strategy=
65 strategy_opts=
66 do_merge=
67 merge_dir="$GIT_DIR"/rebase-merge
68 apply_dir="$GIT_DIR"/rebase-apply
69 verbose=
70 diffstat=
71 test "$(git config --bool rebase.stat)" = true && diffstat=t
72 autostash="$(git config --bool rebase.autostash || echo false)"
73 fork_point=auto
74 git_am_opt=
75 rebase_root=
76 force_rebase=
77 allow_rerere_autoupdate=
78 # Non-empty if a rebase was in progress when 'git rebase' was invoked
79 in_progress=
80 # One of {am, merge, interactive}
81 type=
82 # One of {"$GIT_DIR"/rebase-apply, "$GIT_DIR"/rebase-merge}
83 state_dir=
84 # One of {'', continue, skip, abort}, as parsed from command line
85 action=
86 preserve_merges=
87 autosquash=
88 keep_empty=
89 test "$(git config --bool rebase.autosquash)" = "true" && autosquash=t
90 gpg_sign_opt=
91
92 read_basic_state () {
93         test -f "$state_dir/head-name" &&
94         test -f "$state_dir/onto" &&
95         head_name=$(cat "$state_dir"/head-name) &&
96         onto=$(cat "$state_dir"/onto) &&
97         # We always write to orig-head, but interactive rebase used to write to
98         # head. Fall back to reading from head to cover for the case that the
99         # user upgraded git with an ongoing interactive rebase.
100         if test -f "$state_dir"/orig-head
101         then
102                 orig_head=$(cat "$state_dir"/orig-head)
103         else
104                 orig_head=$(cat "$state_dir"/head)
105         fi &&
106         GIT_QUIET=$(cat "$state_dir"/quiet) &&
107         test -f "$state_dir"/verbose && verbose=t
108         test -f "$state_dir"/strategy && strategy="$(cat "$state_dir"/strategy)"
109         test -f "$state_dir"/strategy_opts &&
110                 strategy_opts="$(cat "$state_dir"/strategy_opts)"
111         test -f "$state_dir"/allow_rerere_autoupdate &&
112                 allow_rerere_autoupdate="$(cat "$state_dir"/allow_rerere_autoupdate)"
113         test -f "$state_dir"/gpg_sign_opt &&
114                 gpg_sign_opt="$(cat "$state_dir"/gpg_sign_opt)"
115 }
116
117 write_basic_state () {
118         echo "$head_name" > "$state_dir"/head-name &&
119         echo "$onto" > "$state_dir"/onto &&
120         echo "$orig_head" > "$state_dir"/orig-head &&
121         echo "$GIT_QUIET" > "$state_dir"/quiet &&
122         test t = "$verbose" && : > "$state_dir"/verbose
123         test -n "$strategy" && echo "$strategy" > "$state_dir"/strategy
124         test -n "$strategy_opts" && echo "$strategy_opts" > \
125                 "$state_dir"/strategy_opts
126         test -n "$allow_rerere_autoupdate" && echo "$allow_rerere_autoupdate" > \
127                 "$state_dir"/allow_rerere_autoupdate
128         test -n "$gpg_sign_opt" && echo "$gpg_sign_opt" > "$state_dir"/gpg_sign_opt
129 }
130
131 output () {
132         case "$verbose" in
133         '')
134                 output=$("$@" 2>&1 )
135                 status=$?
136                 test $status != 0 && printf "%s\n" "$output"
137                 return $status
138                 ;;
139         *)
140                 "$@"
141                 ;;
142         esac
143 }
144
145 move_to_original_branch () {
146         case "$head_name" in
147         refs/*)
148                 message="rebase finished: $head_name onto $onto"
149                 git update-ref -m "$message" \
150                         $head_name $(git rev-parse HEAD) $orig_head &&
151                 git symbolic-ref \
152                         -m "rebase finished: returning to $head_name" \
153                         HEAD $head_name ||
154                 die "$(gettext "Could not move back to $head_name")"
155                 ;;
156         esac
157 }
158
159 apply_autostash () {
160         if test -f "$state_dir/autostash"
161         then
162                 stash_sha1=$(cat "$state_dir/autostash")
163                 if git stash apply $stash_sha1 2>&1 >/dev/null
164                 then
165                         echo "$(gettext 'Applied autostash.')"
166                 else
167                         git stash store -m "autostash" -q $stash_sha1 ||
168                         die "$(eval_gettext "Cannot store \$stash_sha1")"
169                         gettext 'Applying autostash resulted in conflicts.
170 Your changes are safe in the stash.
171 You can run "git stash pop" or "git stash drop" at any time.
172 '
173                 fi
174         fi
175 }
176
177 finish_rebase () {
178         apply_autostash &&
179         { git gc --auto || true; } &&
180         rm -rf "$state_dir"
181 }
182
183 run_specific_rebase () {
184         if [ "$interactive_rebase" = implied ]; then
185                 GIT_EDITOR=:
186                 export GIT_EDITOR
187                 autosquash=
188         fi
189         . git-rebase--$type
190         ret=$?
191         if test $ret -eq 0
192         then
193                 finish_rebase
194         elif test $ret -eq 2 # special exit status for rebase -i
195         then
196                 apply_autostash &&
197                 rm -rf "$state_dir" &&
198                 die "Nothing to do"
199         fi
200         exit $ret
201 }
202
203 run_pre_rebase_hook () {
204         if test -z "$ok_to_skip_pre_rebase" &&
205            test -x "$(git rev-parse --git-path hooks/pre-rebase)"
206         then
207                 "$(git rev-parse --git-path hooks/pre-rebase)" ${1+"$@"} ||
208                 die "$(gettext "The pre-rebase hook refused to rebase.")"
209         fi
210 }
211
212 test -f "$apply_dir"/applying &&
213         die "$(gettext "It looks like git-am is in progress. Cannot rebase.")"
214
215 if test -d "$apply_dir"
216 then
217         type=am
218         state_dir="$apply_dir"
219 elif test -d "$merge_dir"
220 then
221         if test -f "$merge_dir"/interactive
222         then
223                 type=interactive
224                 interactive_rebase=explicit
225         else
226                 type=merge
227         fi
228         state_dir="$merge_dir"
229 fi
230 test -n "$type" && in_progress=t
231
232 total_argc=$#
233 while test $# != 0
234 do
235         case "$1" in
236         --no-verify)
237                 ok_to_skip_pre_rebase=yes
238                 ;;
239         --verify)
240                 ok_to_skip_pre_rebase=
241                 ;;
242         --continue|--skip|--abort|--edit-todo)
243                 test $total_argc -eq 2 || usage
244                 action=${1##--}
245                 ;;
246         --onto=*)
247                 onto="${1#--onto=}"
248                 ;;
249         --exec=*)
250                 cmd="${cmd}exec ${1#--exec=}${LF}"
251                 test -z "$interactive_rebase" && interactive_rebase=implied
252                 ;;
253         --interactive)
254                 interactive_rebase=explicit
255                 ;;
256         --keep-empty)
257                 keep_empty=yes
258                 ;;
259         --preserve-merges)
260                 preserve_merges=t
261                 test -z "$interactive_rebase" && interactive_rebase=implied
262                 ;;
263         --autosquash)
264                 autosquash=t
265                 ;;
266         --no-autosquash)
267                 autosquash=
268                 ;;
269         --fork-point)
270                 fork_point=t
271                 ;;
272         --no-fork-point)
273                 fork_point=
274                 ;;
275         --merge)
276                 do_merge=t
277                 ;;
278         --strategy-option=*)
279                 strategy_opts="$strategy_opts $(git rev-parse --sq-quote "--${1#--strategy-option=}")"
280                 do_merge=t
281                 test -z "$strategy" && strategy=recursive
282                 ;;
283         --strategy=*)
284                 strategy="${1#--strategy=}"
285                 do_merge=t
286                 ;;
287         --no-stat)
288                 diffstat=
289                 ;;
290         --stat)
291                 diffstat=t
292                 ;;
293         --autostash)
294                 autostash=true
295                 ;;
296         --no-autostash)
297                 autostash=false
298                 ;;
299         --verbose)
300                 verbose=t
301                 diffstat=t
302                 GIT_QUIET=
303                 ;;
304         --quiet)
305                 GIT_QUIET=t
306                 git_am_opt="$git_am_opt -q"
307                 verbose=
308                 diffstat=
309                 ;;
310         --whitespace=*)
311                 git_am_opt="$git_am_opt --whitespace=${1#--whitespace=}"
312                 case "${1#--whitespace=}" in
313                 fix|strip)
314                         force_rebase=t
315                         ;;
316                 esac
317                 ;;
318         --ignore-whitespace)
319                 git_am_opt="$git_am_opt $1"
320                 ;;
321         --committer-date-is-author-date|--ignore-date)
322                 git_am_opt="$git_am_opt $1"
323                 force_rebase=t
324                 ;;
325         -C*)
326                 git_am_opt="$git_am_opt $1"
327                 ;;
328         --root)
329                 rebase_root=t
330                 ;;
331         --force-rebase|--no-ff)
332                 force_rebase=t
333                 ;;
334         --rerere-autoupdate|--no-rerere-autoupdate)
335                 allow_rerere_autoupdate="$1"
336                 ;;
337         --gpg-sign)
338                 gpg_sign_opt=-S
339                 ;;
340         --gpg-sign=*)
341                 gpg_sign_opt="-S${1#--gpg-sign=}"
342                 ;;
343         --)
344                 shift
345                 break
346                 ;;
347         esac
348         shift
349 done
350 test $# -gt 2 && usage
351
352 if test -n "$action"
353 then
354         test -z "$in_progress" && die "$(gettext "No rebase in progress?")"
355         # Only interactive rebase uses detailed reflog messages
356         if test "$type" = interactive && test "$GIT_REFLOG_ACTION" = rebase
357         then
358                 GIT_REFLOG_ACTION="rebase -i ($action)"
359                 export GIT_REFLOG_ACTION
360         fi
361 fi
362
363 if test "$action" = "edit-todo" && test "$type" != "interactive"
364 then
365         die "$(gettext "The --edit-todo action can only be used during interactive rebase.")"
366 fi
367
368 case "$action" in
369 continue)
370         # Sanity check
371         git rev-parse --verify HEAD >/dev/null ||
372                 die "$(gettext "Cannot read HEAD")"
373         git update-index --ignore-submodules --refresh &&
374         git diff-files --quiet --ignore-submodules || {
375                 echo "$(gettext "You must edit all merge conflicts and then
376 mark them as resolved using git add")"
377                 exit 1
378         }
379         read_basic_state
380         run_specific_rebase
381         ;;
382 skip)
383         output git reset --hard HEAD || exit $?
384         read_basic_state
385         run_specific_rebase
386         ;;
387 abort)
388         git rerere clear
389         read_basic_state
390         case "$head_name" in
391         refs/*)
392                 git symbolic-ref -m "rebase: aborting" HEAD $head_name ||
393                 die "$(eval_gettext "Could not move back to \$head_name")"
394                 ;;
395         esac
396         output git reset --hard $orig_head
397         finish_rebase
398         exit
399         ;;
400 edit-todo)
401         run_specific_rebase
402         ;;
403 esac
404
405 # Make sure no rebase is in progress
406 if test -n "$in_progress"
407 then
408         state_dir_base=${state_dir##*/}
409         cmd_live_rebase="git rebase (--continue | --abort | --skip)"
410         cmd_clear_stale_rebase="rm -fr \"$state_dir\""
411         die "
412 $(eval_gettext 'It seems that there is already a $state_dir_base directory, and
413 I wonder if you are in the middle of another rebase.  If that is the
414 case, please try
415         $cmd_live_rebase
416 If that is not the case, please
417         $cmd_clear_stale_rebase
418 and run me again.  I am stopping in case you still have something
419 valuable there.')"
420 fi
421
422 if test -n "$rebase_root" && test -z "$onto"
423 then
424         test -z "$interactive_rebase" && interactive_rebase=implied
425 fi
426
427 if test -n "$interactive_rebase"
428 then
429         type=interactive
430         state_dir="$merge_dir"
431 elif test -n "$do_merge"
432 then
433         type=merge
434         state_dir="$merge_dir"
435 else
436         type=am
437         state_dir="$apply_dir"
438 fi
439
440 if test -z "$rebase_root"
441 then
442         case "$#" in
443         0)
444                 if ! upstream_name=$(git rev-parse --symbolic-full-name \
445                         --verify -q @{upstream} 2>/dev/null)
446                 then
447                         . git-parse-remote
448                         error_on_missing_default_upstream "rebase" "rebase" \
449                                 "against" "git rebase <branch>"
450                 fi
451
452                 test "$fork_point" = auto && fork_point=t
453                 ;;
454         *)      upstream_name="$1"
455                 if test "$upstream_name" = "-"
456                 then
457                         upstream_name="@{-1}"
458                 fi
459                 shift
460                 ;;
461         esac
462         upstream=$(peel_committish "${upstream_name}") ||
463         die "$(eval_gettext "invalid upstream \$upstream_name")"
464         upstream_arg="$upstream_name"
465 else
466         if test -z "$onto"
467         then
468                 empty_tree=$(git hash-object -t tree /dev/null)
469                 onto=$(git commit-tree $empty_tree </dev/null)
470                 squash_onto="$onto"
471         fi
472         unset upstream_name
473         unset upstream
474         test $# -gt 1 && usage
475         upstream_arg=--root
476 fi
477
478 # Make sure the branch to rebase onto is valid.
479 onto_name=${onto-"$upstream_name"}
480 case "$onto_name" in
481 *...*)
482         if      left=${onto_name%...*} right=${onto_name#*...} &&
483                 onto=$(git merge-base --all ${left:-HEAD} ${right:-HEAD})
484         then
485                 case "$onto" in
486                 ?*"$LF"?*)
487                         die "$(eval_gettext "\$onto_name: there are more than one merge bases")"
488                         ;;
489                 '')
490                         die "$(eval_gettext "\$onto_name: there is no merge base")"
491                         ;;
492                 esac
493         else
494                 die "$(eval_gettext "\$onto_name: there is no merge base")"
495         fi
496         ;;
497 *)
498         onto=$(peel_committish "$onto_name") ||
499         die "$(eval_gettext "Does not point to a valid commit: \$onto_name")"
500         ;;
501 esac
502
503 # If the branch to rebase is given, that is the branch we will rebase
504 # $branch_name -- branch being rebased, or HEAD (already detached)
505 # $orig_head -- commit object name of tip of the branch before rebasing
506 # $head_name -- refs/heads/<that-branch> or "detached HEAD"
507 switch_to=
508 case "$#" in
509 1)
510         # Is it "rebase other $branchname" or "rebase other $commit"?
511         branch_name="$1"
512         switch_to="$1"
513
514         if git show-ref --verify --quiet -- "refs/heads/$1" &&
515            orig_head=$(git rev-parse -q --verify "refs/heads/$1")
516         then
517                 head_name="refs/heads/$1"
518         elif orig_head=$(git rev-parse -q --verify "$1")
519         then
520                 head_name="detached HEAD"
521         else
522                 die "$(eval_gettext "fatal: no such branch: \$branch_name")"
523         fi
524         ;;
525 0)
526         # Do not need to switch branches, we are already on it.
527         if branch_name=$(git symbolic-ref -q HEAD)
528         then
529                 head_name=$branch_name
530                 branch_name=$(expr "z$branch_name" : 'zrefs/heads/\(.*\)')
531         else
532                 head_name="detached HEAD"
533                 branch_name=HEAD ;# detached
534         fi
535         orig_head=$(git rev-parse --verify HEAD) || exit
536         ;;
537 *)
538         die "BUG: unexpected number of arguments left to parse"
539         ;;
540 esac
541
542 if test "$fork_point" = t
543 then
544         new_upstream=$(git merge-base --fork-point "$upstream_name" \
545                         "${switch_to:-HEAD}")
546         if test -n "$new_upstream"
547         then
548                 restrict_revision=$new_upstream
549         fi
550 fi
551
552 if test "$autostash" = true && ! (require_clean_work_tree) 2>/dev/null
553 then
554         stash_sha1=$(git stash create "autostash") ||
555         die "$(gettext 'Cannot autostash')"
556
557         mkdir -p "$state_dir" &&
558         echo $stash_sha1 >"$state_dir/autostash" &&
559         stash_abbrev=$(git rev-parse --short $stash_sha1) &&
560         echo "$(eval_gettext 'Created autostash: $stash_abbrev')" &&
561         git reset --hard
562 fi
563
564 require_clean_work_tree "rebase" "$(gettext "Please commit or stash them.")"
565
566 # Now we are rebasing commits $upstream..$orig_head (or with --root,
567 # everything leading up to $orig_head) on top of $onto
568
569 # Check if we are already based on $onto with linear history,
570 # but this should be done only when upstream and onto are the same
571 # and if this is not an interactive rebase.
572 mb=$(git merge-base "$onto" "$orig_head")
573 if test "$type" != interactive && test "$upstream" = "$onto" &&
574         test "$mb" = "$onto" && test -z "$restrict_revision" &&
575         # linear history?
576         ! (git rev-list --parents "$onto".."$orig_head" | sane_grep " .* ") > /dev/null
577 then
578         if test -z "$force_rebase"
579         then
580                 # Lazily switch to the target branch if needed...
581                 test -z "$switch_to" ||
582                 GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $switch_to" \
583                         git checkout -q "$switch_to" --
584                 say "$(eval_gettext "Current branch \$branch_name is up to date.")"
585                 finish_rebase
586                 exit 0
587         else
588                 say "$(eval_gettext "Current branch \$branch_name is up to date, rebase forced.")"
589         fi
590 fi
591
592 # If a hook exists, give it a chance to interrupt
593 run_pre_rebase_hook "$upstream_arg" "$@"
594
595 if test -n "$diffstat"
596 then
597         if test -n "$verbose"
598         then
599                 echo "$(eval_gettext "Changes from \$mb to \$onto:")"
600         fi
601         # We want color (if set), but no pager
602         GIT_PAGER='' git diff --stat --summary "$mb" "$onto"
603 fi
604
605 test "$type" = interactive && run_specific_rebase
606
607 # Detach HEAD and reset the tree
608 say "$(gettext "First, rewinding head to replay your work on top of it...")"
609
610 GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $onto_name" \
611         git checkout -q "$onto^0" || die "could not detach HEAD"
612 git update-ref ORIG_HEAD $orig_head
613
614 # If the $onto is a proper descendant of the tip of the branch, then
615 # we just fast-forwarded.
616 if test "$mb" = "$orig_head"
617 then
618         say "$(eval_gettext "Fast-forwarded \$branch_name to \$onto_name.")"
619         move_to_original_branch
620         finish_rebase
621         exit 0
622 fi
623
624 if test -n "$rebase_root"
625 then
626         revisions="$onto..$orig_head"
627 else
628         revisions="${restrict_revision-$upstream}..$orig_head"
629 fi
630
631 run_specific_rebase