git-rebase--interactive.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2006 Johannes E. Schindelin
   4
   5 # SHORT DESCRIPTION
   6 #
   7 # This script makes it easy to fix up commits in the middle of a series,
   8 # and rearrange commits.
   9 #
  10 # The original idea comes from Eric W. Biederman, in
  11 # http://article.gmane.org/gmane.comp.version-control.git/22407
  12
  13 OPTIONS_KEEPDASHDASH=
  14 OPTIONS_SPEC="\
  15 git-rebase [-i] [options] [--] <upstream> [<branch>]
  16 git-rebase [-i] (--continue | --abort | --skip)
  17 --
  18  Available options are
  19 v,verbose          display a diffstat of what changed upstream
  20 onto=              rebase onto given branch instead of upstream
  21 p,preserve-merges  try to recreate merges instead of ignoring them
  22 s,strategy=        use the given merge strategy
  23 m,merge            always used (no-op)
  24 i,interactive      always used (no-op)
  25  Actions:
  26 continue           continue rebasing process
  27 abort              abort rebasing process and restore original branch
  28 skip               skip current patch and continue rebasing process
  29 no-verify          override pre-rebase hook from stopping the operation
  30 root               rebase all reachable commmits up to the root(s)
  31 autosquash         move commits that begin with squash!/fixup! under -i
  32 "
  33
  34 . git-sh-setup
  35 require_work_tree
  36
  37 DOTEST="$GIT_DIR/rebase-merge"
  38
  39 # The file containing rebase commands, comments, and empty lines.
  40 # This file is created by "git rebase -i" then edited by the user.  As
  41 # the lines are processed, they are removed from the front of this
  42 # file and written to the tail of $DONE.
  43 TODO="$DOTEST"/git-rebase-todo
  44
  45 # The rebase command lines that have already been processed.  A line
  46 # is moved here when it is first handled, before any associated user
  47 # actions.
  48 DONE="$DOTEST"/done
  49
  50 # The commit message that is planned to be used for any changes that
  51 # need to be committed following a user interaction.
  52 MSG="$DOTEST"/message
  53
  54 # The file into which is accumulated the suggested commit message for
  55 # squash/fixup commands.  When the first of a series of squash/fixups
  56 # is seen, the file is created and the commit message from the
  57 # previous commit and from the first squash/fixup commit are written
  58 # to it.  The commit message for each subsequent squash/fixup commit
  59 # is appended to the file as it is processed.
  60 #
  61 # The first line of the file is of the form
  62 #     # This is a combination of $COUNT commits.
  63 # where $COUNT is the number of commits whose messages have been
  64 # written to the file so far (including the initial "pick" commit).
  65 # Each time that a commit message is processed, this line is read and
  66 # updated.  It is deleted just before the combined commit is made.
  67 SQUASH_MSG="$DOTEST"/message-squash
  68
  69 # If the current series of squash/fixups has not yet included a squash
  70 # command, then this file exists and holds the commit message of the
  71 # original "pick" commit.  (If the series ends without a "squash"
  72 # command, then this can be used as the commit message of the combined
  73 # commit without opening the editor.)
  74 FIXUP_MSG="$DOTEST"/message-fixup
  75
  76 # $REWRITTEN is the name of a directory containing files for each
  77 # commit that is reachable by at least one merge base of $HEAD and
  78 # $UPSTREAM. They are not necessarily rewritten, but their children
  79 # might be.  This ensures that commits on merged, but otherwise
  80 # unrelated side branches are left alone. (Think "X" in the man page's
  81 # example.)
  82 REWRITTEN="$DOTEST"/rewritten
  83
  84 DROPPED="$DOTEST"/dropped
  85
  86 # A script to set the GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, and
  87 # GIT_AUTHOR_DATE that will be used for the commit that is currently
  88 # being rebased.
  89 AUTHOR_SCRIPT="$DOTEST"/author-script
  90
  91 # When an "edit" rebase command is being processed, the SHA1 of the
  92 # commit to be edited is recorded in this file.  When "git rebase
  93 # --continue" is executed, if there are any staged changes then they
  94 # will be amended to the HEAD commit, but only provided the HEAD
  95 # commit is still the commit to be edited.  When any other rebase
  96 # command is processed, this file is deleted.
  97 AMEND="$DOTEST"/amend
  98
  99 PRESERVE_MERGES=
 100 STRATEGY=
 101 ONTO=
 102 VERBOSE=
 103 OK_TO_SKIP_PRE_REBASE=
 104 REBASE_ROOT=
 105 AUTOSQUASH=
 106
 107 GIT_CHERRY_PICK_HELP="  After resolving the conflicts,
 108 mark the corrected paths with 'git add <paths>', and
 109 run 'git rebase --continue'"
 110 export GIT_CHERRY_PICK_HELP
 111
 112 warn () {
 113         echo "$*" >&2
 114 }
 115
 116 output () {
 117         case "$VERBOSE" in
 118         '')
 119                 output=$("$@" 2>&1 )
 120                 status=$?
 121                 test $status != 0 && printf "%s\n" "$output"
 122                 return $status
 123                 ;;
 124         *)
 125                 "$@"
 126                 ;;
 127         esac
 128 }
 129
 130 # Output the commit message for the specified commit.
 131 commit_message () {
 132         git cat-file commit "$1" | sed "1,/^$/d"
 133 }
 134
 135 run_pre_rebase_hook () {
 136         if test -z "$OK_TO_SKIP_PRE_REBASE" &&
 137            test -x "$GIT_DIR/hooks/pre-rebase"
 138         then
 139                 "$GIT_DIR/hooks/pre-rebase" ${1+"$@"} || {
 140                         echo >&2 "The pre-rebase hook refused to rebase."
 141                         exit 1
 142                 }
 143         fi
 144 }
 145
 146 require_clean_work_tree () {
 147         # test if working tree is dirty
 148         git rev-parse --verify HEAD > /dev/null &&
 149         git update-index --ignore-submodules --refresh &&
 150         git diff-files --quiet --ignore-submodules &&
 151         git diff-index --cached --quiet HEAD --ignore-submodules -- ||
 152         die "Working tree is dirty"
 153 }
 154
 155 ORIG_REFLOG_ACTION="$GIT_REFLOG_ACTION"
 156
 157 comment_for_reflog () {
 158         case "$ORIG_REFLOG_ACTION" in
 159         ''|rebase*)
 160                 GIT_REFLOG_ACTION="rebase -i ($1)"
 161                 export GIT_REFLOG_ACTION
 162                 ;;
 163         esac
 164 }
 165
 166 last_count=
 167 mark_action_done () {
 168         sed -e 1q < "$TODO" >> "$DONE"
 169         sed -e 1d < "$TODO" >> "$TODO".new
 170         mv -f "$TODO".new "$TODO"
 171         count=$(sane_grep -c '^[^#]' < "$DONE")
 172         total=$(($count+$(sane_grep -c '^[^#]' < "$TODO")))
 173         if test "$last_count" != "$count"
 174         then
 175                 last_count=$count
 176                 printf "Rebasing (%d/%d)\r" $count $total
 177                 test -z "$VERBOSE" || echo
 178         fi
 179 }
 180
 181 make_patch () {
 182         sha1_and_parents="$(git rev-list --parents -1 "$1")"
 183         case "$sha1_and_parents" in
 184         ?*' '?*' '?*)
 185                 git diff --cc $sha1_and_parents
 186                 ;;
 187         ?*' '?*)
 188                 git diff-tree -p "$1^!"
 189                 ;;
 190         *)
 191                 echo "Root commit"
 192                 ;;
 193         esac > "$DOTEST"/patch
 194         test -f "$MSG" ||
 195                 commit_message "$1" > "$MSG"
 196         test -f "$AUTHOR_SCRIPT" ||
 197                 get_author_ident_from_commit "$1" > "$AUTHOR_SCRIPT"
 198 }
 199
 200 die_with_patch () {
 201         make_patch "$1"
 202         git rerere
 203         die "$2"
 204 }
 205
 206 die_abort () {
 207         rm -rf "$DOTEST"
 208         die "$1"
 209 }
 210
 211 has_action () {
 212         sane_grep '^[^#]' "$1" >/dev/null
 213 }
 214
 215 # Run command with GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, and
 216 # GIT_AUTHOR_DATE exported from the current environment.
 217 do_with_author () {
 218         (
 219                 export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_AUTHOR_DATE
 220                 "$@"
 221         )
 222 }
 223
 224 pick_one () {
 225         ff=--ff
 226         case "$1" in -n) sha1=$2; ff= ;; *) sha1=$1 ;; esac
 227         output git rev-parse --verify $sha1 || die "Invalid commit name: $sha1"
 228         test -d "$REWRITTEN" &&
 229                 pick_one_preserving_merges "$@" && return
 230         if test -n "$REBASE_ROOT"
 231         then
 232                 output git cherry-pick "$@"
 233                 return
 234         fi
 235         output git cherry-pick $ff "$@"
 236 }
 237
 238 pick_one_preserving_merges () {
 239         fast_forward=t
 240         case "$1" in
 241         -n)
 242                 fast_forward=f
 243                 sha1=$2
 244                 ;;
 245         *)
 246                 sha1=$1
 247                 ;;
 248         esac
 249         sha1=$(git rev-parse $sha1)
 250
 251         if test -f "$DOTEST"/current-commit
 252         then
 253                 if test "$fast_forward" = t
 254                 then
 255                         cat "$DOTEST"/current-commit | while read current_commit
 256                         do
 257                                 git rev-parse HEAD > "$REWRITTEN"/$current_commit
 258                         done
 259                         rm "$DOTEST"/current-commit ||
 260                         die "Cannot write current commit's replacement sha1"
 261                 fi
 262         fi
 263
 264         echo $sha1 >> "$DOTEST"/current-commit
 265
 266         # rewrite parents; if none were rewritten, we can fast-forward.
 267         new_parents=
 268         pend=" $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)"
 269         if test "$pend" = " "
 270         then
 271                 pend=" root"
 272         fi
 273         while [ "$pend" != "" ]
 274         do
 275                 p=$(expr "$pend" : ' \([^ ]*\)')
 276                 pend="${pend# $p}"
 277
 278                 if test -f "$REWRITTEN"/$p
 279                 then
 280                         new_p=$(cat "$REWRITTEN"/$p)
 281
 282                         # If the todo reordered commits, and our parent is marked for
 283                         # rewriting, but hasn't been gotten to yet, assume the user meant to
 284                         # drop it on top of the current HEAD
 285                         if test -z "$new_p"
 286                         then
 287                                 new_p=$(git rev-parse HEAD)
 288                         fi
 289
 290                         test $p != $new_p && fast_forward=f
 291                         case "$new_parents" in
 292                         *$new_p*)
 293                                 ;; # do nothing; that parent is already there
 294                         *)
 295                                 new_parents="$new_parents $new_p"
 296                                 ;;
 297                         esac
 298                 else
 299                         if test -f "$DROPPED"/$p
 300                         then
 301                                 fast_forward=f
 302                                 replacement="$(cat "$DROPPED"/$p)"
 303                                 test -z "$replacement" && replacement=root
 304                                 pend=" $replacement$pend"
 305                         else
 306                                 new_parents="$new_parents $p"
 307                         fi
 308                 fi
 309         done
 310         case $fast_forward in
 311         t)
 312                 output warn "Fast-forward to $sha1"
 313                 output git reset --hard $sha1 ||
 314                         die "Cannot fast-forward to $sha1"
 315                 ;;
 316         f)
 317                 first_parent=$(expr "$new_parents" : ' \([^ ]*\)')
 318
 319                 if [ "$1" != "-n" ]
 320                 then
 321                         # detach HEAD to current parent
 322                         output git checkout $first_parent 2> /dev/null ||
 323                                 die "Cannot move HEAD to $first_parent"
 324                 fi
 325
 326                 case "$new_parents" in
 327                 ' '*' '*)
 328                         test "a$1" = a-n && die "Refusing to squash a merge: $sha1"
 329
 330                         # redo merge
 331                         author_script=$(get_author_ident_from_commit $sha1)
 332                         eval "$author_script"
 333                         msg="$(commit_message $sha1)"
 334                         # No point in merging the first parent, that's HEAD
 335                         new_parents=${new_parents# $first_parent}
 336                         if ! do_with_author output \
 337                                 git merge $STRATEGY -m "$msg" $new_parents
 338                         then
 339                                 printf "%s\n" "$msg" > "$GIT_DIR"/MERGE_MSG
 340                                 die_with_patch $sha1 "Error redoing merge $sha1"
 341                         fi
 342                         ;;
 343                 *)
 344                         output git cherry-pick "$@" ||
 345                                 die_with_patch $sha1 "Could not pick $sha1"
 346                         ;;
 347                 esac
 348                 ;;
 349         esac
 350 }
 351
 352 nth_string () {
 353         case "$1" in
 354         *1[0-9]|*[04-9]) echo "$1"th;;
 355         *1) echo "$1"st;;
 356         *2) echo "$1"nd;;
 357         *3) echo "$1"rd;;
 358         esac
 359 }
 360
 361 update_squash_messages () {
 362         if test -f "$SQUASH_MSG"; then
 363                 mv "$SQUASH_MSG" "$SQUASH_MSG".bak || exit
 364                 COUNT=$(($(sed -n \
 365                         -e "1s/^# This is a combination of \(.*\) commits\./\1/p" \
 366                         -e "q" < "$SQUASH_MSG".bak)+1))
 367                 {
 368                         echo "# This is a combination of $COUNT commits."
 369                         sed -e 1d -e '2,/^./{
 370                                 /^$/d
 371                         }' <"$SQUASH_MSG".bak
 372                 } >"$SQUASH_MSG"
 373         else
 374                 commit_message HEAD > "$FIXUP_MSG" || die "Cannot write $FIXUP_MSG"
 375                 COUNT=2
 376                 {
 377                         echo "# This is a combination of 2 commits."
 378                         echo "# The first commit's message is:"
 379                         echo
 380                         cat "$FIXUP_MSG"
 381                 } >"$SQUASH_MSG"
 382         fi
 383         case $1 in
 384         squash)
 385                 rm -f "$FIXUP_MSG"
 386                 echo
 387                 echo "# This is the $(nth_string $COUNT) commit message:"
 388                 echo
 389                 commit_message $2
 390                 ;;
 391         fixup)
 392                 echo
 393                 echo "# The $(nth_string $COUNT) commit message will be skipped:"
 394                 echo
 395                 commit_message $2 | sed -e 's/^/#       /'
 396                 ;;
 397         esac >>"$SQUASH_MSG"
 398 }
 399
 400 peek_next_command () {
 401         sed -n -e "/^#/d" -e '/^$/d' -e "s/ .*//p" -e "q" < "$TODO"
 402 }
 403
 404 # A squash/fixup has failed.  Prepare the long version of the squash
 405 # commit message, then die_with_patch.  This code path requires the
 406 # user to edit the combined commit message for all commits that have
 407 # been squashed/fixedup so far.  So also erase the old squash
 408 # messages, effectively causing the combined commit to be used as the
 409 # new basis for any further squash/fixups.  Args: sha1 rest
 410 die_failed_squash() {
 411         mv "$SQUASH_MSG" "$MSG" || exit
 412         rm -f "$FIXUP_MSG"
 413         cp "$MSG" "$GIT_DIR"/MERGE_MSG || exit
 414         warn
 415         warn "Could not apply $1... $2"
 416         die_with_patch $1 ""
 417 }
 418
 419 do_next () {
 420         rm -f "$MSG" "$AUTHOR_SCRIPT" "$AMEND" || exit
 421         read command sha1 rest < "$TODO"
 422         case "$command" in
 423         '#'*|''|noop)
 424                 mark_action_done
 425                 ;;
 426         pick|p)
 427                 comment_for_reflog pick
 428
 429                 mark_action_done
 430                 pick_one $sha1 ||
 431                         die_with_patch $sha1 "Could not apply $sha1... $rest"
 432                 ;;
 433         reword|r)
 434                 comment_for_reflog reword
 435
 436                 mark_action_done
 437                 pick_one $sha1 ||
 438                         die_with_patch $sha1 "Could not apply $sha1... $rest"
 439                 git commit --amend
 440                 ;;
 441         edit|e)
 442                 comment_for_reflog edit
 443
 444                 mark_action_done
 445                 pick_one $sha1 ||
 446                         die_with_patch $sha1 "Could not apply $sha1... $rest"
 447                 make_patch $sha1
 448                 git rev-parse --verify HEAD > "$AMEND"
 449                 warn "Stopped at $sha1... $rest"
 450                 warn "You can amend the commit now, with"
 451                 warn
 452                 warn "  git commit --amend"
 453                 warn
 454                 warn "Once you are satisfied with your changes, run"
 455                 warn
 456                 warn "  git rebase --continue"
 457                 warn
 458                 exit 0
 459                 ;;
 460         squash|s|fixup|f)
 461                 case "$command" in
 462                 squash|s)
 463                         squash_style=squash
 464                         ;;
 465                 fixup|f)
 466                         squash_style=fixup
 467                         ;;
 468                 esac
 469                 comment_for_reflog $squash_style
 470
 471                 test -f "$DONE" && has_action "$DONE" ||
 472                         die "Cannot '$squash_style' without a previous commit"
 473
 474                 mark_action_done
 475                 update_squash_messages $squash_style $sha1
 476                 author_script=$(get_author_ident_from_commit HEAD)
 477                 echo "$author_script" > "$AUTHOR_SCRIPT"
 478                 eval "$author_script"
 479                 output git reset --soft HEAD^
 480                 pick_one -n $sha1 || die_failed_squash $sha1 "$rest"
 481                 case "$(peek_next_command)" in
 482                 squash|s|fixup|f)
 483                         # This is an intermediate commit; its message will only be
 484                         # used in case of trouble.  So use the long version:
 485                         do_with_author output git commit --no-verify -F "$SQUASH_MSG" ||
 486                                 die_failed_squash $sha1 "$rest"
 487                         ;;
 488                 *)
 489                         # This is the final command of this squash/fixup group
 490                         if test -f "$FIXUP_MSG"
 491                         then
 492                                 do_with_author git commit --no-verify -F "$FIXUP_MSG" ||
 493                                         die_failed_squash $sha1 "$rest"
 494                         else
 495                                 cp "$SQUASH_MSG" "$GIT_DIR"/SQUASH_MSG || exit
 496                                 rm -f "$GIT_DIR"/MERGE_MSG
 497                                 do_with_author git commit --no-verify -e ||
 498                                         die_failed_squash $sha1 "$rest"
 499                         fi
 500                         rm -f "$SQUASH_MSG" "$FIXUP_MSG"
 501                         ;;
 502                 esac
 503                 ;;
 504         *)
 505                 warn "Unknown command: $command $sha1 $rest"
 506                 if git rev-parse --verify -q "$sha1" >/dev/null
 507                 then
 508                         die_with_patch $sha1 "Please fix this in the file $TODO."
 509                 else
 510                         die "Please fix this in the file $TODO."
 511                 fi
 512                 ;;
 513         esac
 514         test -s "$TODO" && return
 515
 516         comment_for_reflog finish &&
 517         HEADNAME=$(cat "$DOTEST"/head-name) &&
 518         OLDHEAD=$(cat "$DOTEST"/head) &&
 519         SHORTONTO=$(git rev-parse --short $(cat "$DOTEST"/onto)) &&
 520         NEWHEAD=$(git rev-parse HEAD) &&
 521         case $HEADNAME in
 522         refs/*)
 523                 message="$GIT_REFLOG_ACTION: $HEADNAME onto $SHORTONTO" &&
 524                 git update-ref -m "$message" $HEADNAME $NEWHEAD $OLDHEAD &&
 525                 git symbolic-ref HEAD $HEADNAME
 526                 ;;
 527         esac && {
 528                 test ! -f "$DOTEST"/verbose ||
 529                         git diff-tree --stat $(cat "$DOTEST"/head)..HEAD
 530         } &&
 531         rm -rf "$DOTEST" &&
 532         git gc --auto &&
 533         warn "Successfully rebased and updated $HEADNAME."
 534
 535         exit
 536 }
 537
 538 do_rest () {
 539         while :
 540         do
 541                 do_next
 542         done
 543 }
 544
 545 # skip picking commits whose parents are unchanged
 546 skip_unnecessary_picks () {
 547         fd=3
 548         while read command sha1 rest
 549         do
 550                 # fd=3 means we skip the command
 551                 case "$fd,$command,$(git rev-parse --verify --quiet $sha1^)" in
 552                 3,pick,"$ONTO"*|3,p,"$ONTO"*)
 553                         # pick a commit whose parent is current $ONTO -> skip
 554                         ONTO=$sha1
 555                         ;;
 556                 3,#*|3,,*)
 557                         # copy comments
 558                         ;;
 559                 *)
 560                         fd=1
 561                         ;;
 562                 esac
 563                 echo "$command${sha1:+ }$sha1${rest:+ }$rest" >&$fd
 564         done <"$TODO" >"$TODO.new" 3>>"$DONE" &&
 565         mv -f "$TODO".new "$TODO" ||
 566         die "Could not skip unnecessary pick commands"
 567 }
 568
 569 # check if no other options are set
 570 is_standalone () {
 571         test $# -eq 2 -a "$2" = '--' &&
 572         test -z "$ONTO" &&
 573         test -z "$PRESERVE_MERGES" &&
 574         test -z "$STRATEGY" &&
 575         test -z "$VERBOSE"
 576 }
 577
 578 get_saved_options () {
 579         test -d "$REWRITTEN" && PRESERVE_MERGES=t
 580         test -f "$DOTEST"/strategy && STRATEGY="$(cat "$DOTEST"/strategy)"
 581         test -f "$DOTEST"/verbose && VERBOSE=t
 582         test -f "$DOTEST"/rebase-root && REBASE_ROOT=t
 583 }
 584
 585 # Rearrange the todo list that has both "pick sha1 msg" and
 586 # "pick sha1 fixup!/squash! msg" appears in it so that the latter
 587 # comes immediately after the former, and change "pick" to
 588 # "fixup"/"squash".
 589 rearrange_squash () {
 590         sed -n -e 's/^pick \([0-9a-f]*\) \(squash\)! /\1 \2 /p' \
 591                 -e 's/^pick \([0-9a-f]*\) \(fixup\)! /\1 \2 /p' \
 592                 "$1" >"$1.sq"
 593         test -s "$1.sq" || return
 594
 595         used=
 596         while read pick sha1 message
 597         do
 598                 case " $used" in
 599                 *" $sha1 "*) continue ;;
 600                 esac
 601                 echo "$pick $sha1 $message"
 602                 while read squash action msg
 603                 do
 604                         case "$message" in
 605                         "$msg"*)
 606                                 echo "$action $squash $action! $msg"
 607                                 used="$used$squash "
 608                                 ;;
 609                         esac
 610                 done <"$1.sq"
 611         done >"$1.rearranged" <"$1"
 612         cat "$1.rearranged" >"$1"
 613         rm -f "$1.sq" "$1.rearranged"
 614 }
 615
 616 LF='
 617 '
 618 parse_onto () {
 619         case "$1" in
 620         *...*)
 621                 if      left=${1%...*} right=${1#*...} &&
 622                         onto=$(git merge-base --all ${left:-HEAD} ${right:-HEAD})
 623                 then
 624                         case "$onto" in
 625                         ?*"$LF"?* | '')
 626                                 exit 1 ;;
 627                         esac
 628                         echo "$onto"
 629                         exit 0
 630                 fi
 631         esac
 632         git rev-parse --verify "$1^0"
 633 }
 634
 635 while test $# != 0
 636 do
 637         case "$1" in
 638         --no-verify)
 639                 OK_TO_SKIP_PRE_REBASE=yes
 640                 ;;
 641         --verify)
 642                 ;;
 643         --continue)
 644                 is_standalone "$@" || usage
 645                 get_saved_options
 646                 comment_for_reflog continue
 647
 648                 test -d "$DOTEST" || die "No interactive rebase running"
 649
 650                 # Sanity check
 651                 git rev-parse --verify HEAD >/dev/null ||
 652                         die "Cannot read HEAD"
 653                 git update-index --ignore-submodules --refresh &&
 654                         git diff-files --quiet --ignore-submodules ||
 655                         die "Working tree is dirty"
 656
 657                 # do we have anything to commit?
 658                 if git diff-index --cached --quiet --ignore-submodules HEAD --
 659                 then
 660                         : Nothing to commit -- skip this
 661                 else
 662                         . "$AUTHOR_SCRIPT" ||
 663                                 die "Cannot find the author identity"
 664                         amend=
 665                         if test -f "$AMEND"
 666                         then
 667                                 amend=$(git rev-parse --verify HEAD)
 668                                 test "$amend" = $(cat "$AMEND") ||
 669                                 die "\
 670 You have uncommitted changes in your working tree. Please, commit them
 671 first and then run 'git rebase --continue' again."
 672                                 git reset --soft HEAD^ ||
 673                                 die "Cannot rewind the HEAD"
 674                         fi
 675                         do_with_author git commit --no-verify -F "$MSG" -e || {
 676                                 test -n "$amend" && git reset --soft $amend
 677                                 die "Could not commit staged changes."
 678                         }
 679                 fi
 680
 681                 require_clean_work_tree
 682                 do_rest
 683                 ;;
 684         --abort)
 685                 is_standalone "$@" || usage
 686                 get_saved_options
 687                 comment_for_reflog abort
 688
 689                 git rerere clear
 690                 test -d "$DOTEST" || die "No interactive rebase running"
 691
 692                 HEADNAME=$(cat "$DOTEST"/head-name)
 693                 HEAD=$(cat "$DOTEST"/head)
 694                 case $HEADNAME in
 695                 refs/*)
 696                         git symbolic-ref HEAD $HEADNAME
 697                         ;;
 698                 esac &&
 699                 output git reset --hard $HEAD &&
 700                 rm -rf "$DOTEST"
 701                 exit
 702                 ;;
 703         --skip)
 704                 is_standalone "$@" || usage
 705                 get_saved_options
 706                 comment_for_reflog skip
 707
 708                 git rerere clear
 709                 test -d "$DOTEST" || die "No interactive rebase running"
 710
 711                 output git reset --hard && do_rest
 712                 ;;
 713         -s)
 714                 case "$#,$1" in
 715                 *,*=*)
 716                         STRATEGY="-s "$(expr "z$1" : 'z-[^=]*=\(.*\)') ;;
 717                 1,*)
 718                         usage ;;
 719                 *)
 720                         STRATEGY="-s $2"
 721                         shift ;;
 722                 esac
 723                 ;;
 724         -m)
 725                 # we use merge anyway
 726                 ;;
 727         -v)
 728                 VERBOSE=t
 729                 ;;
 730         -p)
 731                 PRESERVE_MERGES=t
 732                 ;;
 733         -i)
 734                 # yeah, we know
 735                 ;;
 736         --root)
 737                 REBASE_ROOT=t
 738                 ;;
 739         --autosquash)
 740                 AUTOSQUASH=t
 741                 ;;
 742         --onto)
 743                 shift
 744                 ONTO=$(parse_onto "$1") ||
 745                         die "Does not point to a valid commit: $1"
 746                 ;;
 747         --)
 748                 shift
 749                 test -z "$REBASE_ROOT" -a $# -ge 1 -a $# -le 2 ||
 750                 test ! -z "$REBASE_ROOT" -a $# -le 1 || usage
 751                 test -d "$DOTEST" &&
 752                         die "Interactive rebase already started"
 753
 754                 git var GIT_COMMITTER_IDENT >/dev/null ||
 755                         die "You need to set your committer info first"
 756
 757                 if test -z "$REBASE_ROOT"
 758                 then
 759                         UPSTREAM_ARG="$1"
 760                         UPSTREAM=$(git rev-parse --verify "$1") || die "Invalid base"
 761                         test -z "$ONTO" && ONTO=$UPSTREAM
 762                         shift
 763                 else
 764                         UPSTREAM=
 765                         UPSTREAM_ARG=--root
 766                         test -z "$ONTO" &&
 767                                 die "You must specify --onto when using --root"
 768                 fi
 769                 run_pre_rebase_hook "$UPSTREAM_ARG" "$@"
 770
 771                 comment_for_reflog start
 772
 773                 require_clean_work_tree
 774
 775                 if test ! -z "$1"
 776                 then
 777                         output git show-ref --verify --quiet "refs/heads/$1" ||
 778                                 die "Invalid branchname: $1"
 779                         output git checkout "$1" ||
 780                                 die "Could not checkout $1"
 781                 fi
 782
 783                 HEAD=$(git rev-parse --verify HEAD) || die "No HEAD?"
 784                 mkdir "$DOTEST" || die "Could not create temporary $DOTEST"
 785
 786                 : > "$DOTEST"/interactive || die "Could not mark as interactive"
 787                 git symbolic-ref HEAD > "$DOTEST"/head-name 2> /dev/null ||
 788                         echo "detached HEAD" > "$DOTEST"/head-name
 789
 790                 echo $HEAD > "$DOTEST"/head
 791                 case "$REBASE_ROOT" in
 792                 '')
 793                         rm -f "$DOTEST"/rebase-root ;;
 794                 *)
 795                         : >"$DOTEST"/rebase-root ;;
 796                 esac
 797                 echo $ONTO > "$DOTEST"/onto
 798                 test -z "$STRATEGY" || echo "$STRATEGY" > "$DOTEST"/strategy
 799                 test t = "$VERBOSE" && : > "$DOTEST"/verbose
 800                 if test t = "$PRESERVE_MERGES"
 801                 then
 802                         if test -z "$REBASE_ROOT"
 803                         then
 804                                 mkdir "$REWRITTEN" &&
 805                                 for c in $(git merge-base --all $HEAD $UPSTREAM)
 806                                 do
 807                                         echo $ONTO > "$REWRITTEN"/$c ||
 808                                                 die "Could not init rewritten commits"
 809                                 done
 810                         else
 811                                 mkdir "$REWRITTEN" &&
 812                                 echo $ONTO > "$REWRITTEN"/root ||
 813                                         die "Could not init rewritten commits"
 814                         fi
 815                         # No cherry-pick because our first pass is to determine
 816                         # parents to rewrite and skipping dropped commits would
 817                         # prematurely end our probe
 818                         MERGES_OPTION=
 819                         first_after_upstream="$(git rev-list --reverse --first-parent $UPSTREAM..$HEAD | head -n 1)"
 820                 else
 821                         MERGES_OPTION="--no-merges --cherry-pick"
 822                 fi
 823
 824                 SHORTHEAD=$(git rev-parse --short $HEAD)
 825                 SHORTONTO=$(git rev-parse --short $ONTO)
 826                 if test -z "$REBASE_ROOT"
 827                         # this is now equivalent to ! -z "$UPSTREAM"
 828                 then
 829                         SHORTUPSTREAM=$(git rev-parse --short $UPSTREAM)
 830                         REVISIONS=$UPSTREAM...$HEAD
 831                         SHORTREVISIONS=$SHORTUPSTREAM..$SHORTHEAD
 832                 else
 833                         REVISIONS=$ONTO...$HEAD
 834                         SHORTREVISIONS=$SHORTHEAD
 835                 fi
 836                 git rev-list $MERGES_OPTION --pretty=oneline --abbrev-commit \
 837                         --abbrev=7 --reverse --left-right --topo-order \
 838                         $REVISIONS | \
 839                         sed -n "s/^>//p" | while read shortsha1 rest
 840                 do
 841                         if test t != "$PRESERVE_MERGES"
 842                         then
 843                                 echo "pick $shortsha1 $rest" >> "$TODO"
 844                         else
 845                                 sha1=$(git rev-parse $shortsha1)
 846                                 if test -z "$REBASE_ROOT"
 847                                 then
 848                                         preserve=t
 849                                         for p in $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)
 850                                         do
 851                                                 if test -f "$REWRITTEN"/$p -a \( $p != $ONTO -o $sha1 = $first_after_upstream \)
 852                                                 then
 853                                                         preserve=f
 854                                                 fi
 855                                         done
 856                                 else
 857                                         preserve=f
 858                                 fi
 859                                 if test f = "$preserve"
 860                                 then
 861                                         touch "$REWRITTEN"/$sha1
 862                                         echo "pick $shortsha1 $rest" >> "$TODO"
 863                                 fi
 864                         fi
 865                 done
 866
 867                 # Watch for commits that been dropped by --cherry-pick
 868                 if test t = "$PRESERVE_MERGES"
 869                 then
 870                         mkdir "$DROPPED"
 871                         # Save all non-cherry-picked changes
 872                         git rev-list $REVISIONS --left-right --cherry-pick | \
 873                                 sed -n "s/^>//p" > "$DOTEST"/not-cherry-picks
 874                         # Now all commits and note which ones are missing in
 875                         # not-cherry-picks and hence being dropped
 876                         git rev-list $REVISIONS |
 877                         while read rev
 878                         do
 879                                 if test -f "$REWRITTEN"/$rev -a "$(sane_grep "$rev" "$DOTEST"/not-cherry-picks)" = ""
 880                                 then
 881                                         # Use -f2 because if rev-list is telling us this commit is
 882                                         # not worthwhile, we don't want to track its multiple heads,
 883                                         # just the history of its first-parent for others that will
 884                                         # be rebasing on top of it
 885                                         git rev-list --parents -1 $rev | cut -d' ' -s -f2 > "$DROPPED"/$rev
 886                                         short=$(git rev-list -1 --abbrev-commit --abbrev=7 $rev)
 887                                         sane_grep -v "^[a-z][a-z]* $short" <"$TODO" > "${TODO}2" ; mv "${TODO}2" "$TODO"
 888                                         rm "$REWRITTEN"/$rev
 889                                 fi
 890                         done
 891                 fi
 892
 893                 test -s "$TODO" || echo noop >> "$TODO"
 894                 test -n "$AUTOSQUASH" && rearrange_squash "$TODO"
 895                 cat >> "$TODO" << EOF
 896
 897 # Rebase $SHORTREVISIONS onto $SHORTONTO
 898 #
 899 # Commands:
 900 #  p, pick = use commit
 901 #  r, reword = use commit, but edit the commit message
 902 #  e, edit = use commit, but stop for amending
 903 #  s, squash = use commit, but meld into previous commit
 904 #  f, fixup = like "squash", but discard this commit's log message
 905 #
 906 # If you remove a line here THAT COMMIT WILL BE LOST.
 907 # However, if you remove everything, the rebase will be aborted.
 908 #
 909 EOF
 910
 911                 has_action "$TODO" ||
 912                         die_abort "Nothing to do"
 913
 914                 cp "$TODO" "$TODO".backup
 915                 git_editor "$TODO" ||
 916                         die_abort "Could not execute editor"
 917
 918                 has_action "$TODO" ||
 919                         die_abort "Nothing to do"
 920
 921                 test -d "$REWRITTEN" || skip_unnecessary_picks
 922
 923                 git update-ref ORIG_HEAD $HEAD
 924                 output git checkout $ONTO && do_rest
 925                 ;;
 926         esac
 927         shift
 928 done