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 "
  32
  33 . git-sh-setup
  34 require_work_tree
  35
  36 DOTEST="$GIT_DIR/rebase-merge"
  37
  38 # The file containing rebase commands, comments, and empty lines.
  39 # This file is created by "git rebase -i" then edited by the user.  As
  40 # the lines are processed, they are removed from the front of this
  41 # file and written to the tail of $DONE.
  42 TODO="$DOTEST"/git-rebase-todo
  43
  44 # The rebase command lines that have already been processed.  A line
  45 # is moved here when it is first handled, before any associated user
  46 # actions.
  47 DONE="$DOTEST"/done
  48
  49 # The commit message that is planned to be used for any changes that
  50 # need to be committed following a user interaction.
  51 MSG="$DOTEST"/message
  52
  53 # The file into which is accumulated the suggested commit message for
  54 # squash/fixup commands.  When the first of a series of squash/fixups
  55 # is seen, the file is created and the commit message from the
  56 # previous commit and from the first squash/fixup commit are written
  57 # to it.  The commit message for each subsequent squash/fixup commit
  58 # is appended to the file as it is processed.
  59 #
  60 # The first line of the file is of the form
  61 #     # This is a combination of $COUNT commits.
  62 # where $COUNT is the number of commits whose messages have been
  63 # written to the file so far (including the initial "pick" commit).
  64 # Each time that a commit message is processed, this line is read and
  65 # updated.  It is deleted just before the combined commit is made.
  66 SQUASH_MSG="$DOTEST"/message-squash
  67
  68 # If the current series of squash/fixups has not yet included a squash
  69 # command, then this file exists and holds the commit message of the
  70 # original "pick" commit.  (If the series ends without a "squash"
  71 # command, then this can be used as the commit message of the combined
  72 # commit without opening the editor.)
  73 FIXUP_MSG="$DOTEST"/message-fixup
  74
  75 # $REWRITTEN is the name of a directory containing files for each
  76 # commit that is reachable by at least one merge base of $HEAD and
  77 # $UPSTREAM. They are not necessarily rewritten, but their children
  78 # might be.  This ensures that commits on merged, but otherwise
  79 # unrelated side branches are left alone. (Think "X" in the man page's
  80 # example.)
  81 REWRITTEN="$DOTEST"/rewritten
  82
  83 DROPPED="$DOTEST"/dropped
  84
  85 # A script to set the GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, and
  86 # GIT_AUTHOR_DATE that will be used for the commit that is currently
  87 # being rebased.
  88 AUTHOR_SCRIPT="$DOTEST"/author-script
  89
  90 # When an "edit" rebase command is being processed, the SHA1 of the
  91 # commit to be edited is recorded in this file.  When "git rebase
  92 # --continue" is executed, if there are any staged changes then they
  93 # will be amended to the HEAD commit, but only provided the HEAD
  94 # commit is still the commit to be edited.  When any other rebase
  95 # command is processed, this file is deleted.
  96 AMEND="$DOTEST"/amend
  97
  98 PRESERVE_MERGES=
  99 STRATEGY=
 100 ONTO=
 101 VERBOSE=
 102 OK_TO_SKIP_PRE_REBASE=
 103 REBASE_ROOT=
 104
 105 GIT_CHERRY_PICK_HELP="  After resolving the conflicts,
 106 mark the corrected paths with 'git add <paths>', and
 107 run 'git rebase --continue'"
 108 export GIT_CHERRY_PICK_HELP
 109
 110 warn () {
 111         echo "$*" >&2
 112 }
 113
 114 output () {
 115         case "$VERBOSE" in
 116         '')
 117                 output=$("$@" 2>&1 )
 118                 status=$?
 119                 test $status != 0 && printf "%s\n" "$output"
 120                 return $status
 121                 ;;
 122         *)
 123                 "$@"
 124                 ;;
 125         esac
 126 }
 127
 128 # Output the commit message for the specified commit.
 129 commit_message () {
 130         git cat-file commit "$1" | sed "1,/^$/d"
 131 }
 132
 133 run_pre_rebase_hook () {
 134         if test -z "$OK_TO_SKIP_PRE_REBASE" &&
 135            test -x "$GIT_DIR/hooks/pre-rebase"
 136         then
 137                 "$GIT_DIR/hooks/pre-rebase" ${1+"$@"} || {
 138                         echo >&2 "The pre-rebase hook refused to rebase."
 139                         exit 1
 140                 }
 141         fi
 142 }
 143
 144 require_clean_work_tree () {
 145         # test if working tree is dirty
 146         git rev-parse --verify HEAD > /dev/null &&
 147         git update-index --ignore-submodules --refresh &&
 148         git diff-files --quiet --ignore-submodules &&
 149         git diff-index --cached --quiet HEAD --ignore-submodules -- ||
 150         die "Working tree is dirty"
 151 }
 152
 153 ORIG_REFLOG_ACTION="$GIT_REFLOG_ACTION"
 154
 155 comment_for_reflog () {
 156         case "$ORIG_REFLOG_ACTION" in
 157         ''|rebase*)
 158                 GIT_REFLOG_ACTION="rebase -i ($1)"
 159                 export GIT_REFLOG_ACTION
 160                 ;;
 161         esac
 162 }
 163
 164 last_count=
 165 mark_action_done () {
 166         sed -e 1q < "$TODO" >> "$DONE"
 167         sed -e 1d < "$TODO" >> "$TODO".new
 168         mv -f "$TODO".new "$TODO"
 169         count=$(sane_grep -c '^[^#]' < "$DONE")
 170         total=$(($count+$(sane_grep -c '^[^#]' < "$TODO")))
 171         if test "$last_count" != "$count"
 172         then
 173                 last_count=$count
 174                 printf "Rebasing (%d/%d)\r" $count $total
 175                 test -z "$VERBOSE" || echo
 176         fi
 177 }
 178
 179 make_patch () {
 180         sha1_and_parents="$(git rev-list --parents -1 "$1")"
 181         case "$sha1_and_parents" in
 182         ?*' '?*' '?*)
 183                 git diff --cc $sha1_and_parents
 184                 ;;
 185         ?*' '?*)
 186                 git diff-tree -p "$1^!"
 187                 ;;
 188         *)
 189                 echo "Root commit"
 190                 ;;
 191         esac > "$DOTEST"/patch
 192         test -f "$MSG" ||
 193                 commit_message "$1" > "$MSG"
 194         test -f "$AUTHOR_SCRIPT" ||
 195                 get_author_ident_from_commit "$1" > "$AUTHOR_SCRIPT"
 196 }
 197
 198 die_with_patch () {
 199         make_patch "$1"
 200         git rerere
 201         die "$2"
 202 }
 203
 204 die_abort () {
 205         rm -rf "$DOTEST"
 206         die "$1"
 207 }
 208
 209 has_action () {
 210         sane_grep '^[^#]' "$1" >/dev/null
 211 }
 212
 213 # Run command with GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, and
 214 # GIT_AUTHOR_DATE exported from the current environment.
 215 do_with_author () {
 216         GIT_AUTHOR_NAME="$GIT_AUTHOR_NAME" \
 217         GIT_AUTHOR_EMAIL="$GIT_AUTHOR_EMAIL" \
 218         GIT_AUTHOR_DATE="$GIT_AUTHOR_DATE" \
 219         "$@"
 220 }
 221
 222 pick_one () {
 223         no_ff=
 224         case "$1" in -n) sha1=$2; no_ff=t ;; *) sha1=$1 ;; esac
 225         output git rev-parse --verify $sha1 || die "Invalid commit name: $sha1"
 226         test -d "$REWRITTEN" &&
 227                 pick_one_preserving_merges "$@" && return
 228         if test -n "$REBASE_ROOT"
 229         then
 230                 output git cherry-pick "$@"
 231                 return
 232         fi
 233         parent_sha1=$(git rev-parse --verify $sha1^) ||
 234                 die "Could not get the parent of $sha1"
 235         current_sha1=$(git rev-parse --verify HEAD)
 236         if test -z "$no_ff" -a "$current_sha1" = "$parent_sha1"
 237         then
 238                 output git reset --hard $sha1
 239                 output warn Fast-forward to $(git rev-parse --short $sha1)
 240         else
 241                 output git cherry-pick "$@"
 242         fi
 243 }
 244
 245 pick_one_preserving_merges () {
 246         fast_forward=t
 247         case "$1" in
 248         -n)
 249                 fast_forward=f
 250                 sha1=$2
 251                 ;;
 252         *)
 253                 sha1=$1
 254                 ;;
 255         esac
 256         sha1=$(git rev-parse $sha1)
 257
 258         if test -f "$DOTEST"/current-commit
 259         then
 260                 if test "$fast_forward" = t
 261                 then
 262                         cat "$DOTEST"/current-commit | while read current_commit
 263                         do
 264                                 git rev-parse HEAD > "$REWRITTEN"/$current_commit
 265                         done
 266                         rm "$DOTEST"/current-commit ||
 267                         die "Cannot write current commit's replacement sha1"
 268                 fi
 269         fi
 270
 271         echo $sha1 >> "$DOTEST"/current-commit
 272
 273         # rewrite parents; if none were rewritten, we can fast-forward.
 274         new_parents=
 275         pend=" $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)"
 276         if test "$pend" = " "
 277         then
 278                 pend=" root"
 279         fi
 280         while [ "$pend" != "" ]
 281         do
 282                 p=$(expr "$pend" : ' \([^ ]*\)')
 283                 pend="${pend# $p}"
 284
 285                 if test -f "$REWRITTEN"/$p
 286                 then
 287                         new_p=$(cat "$REWRITTEN"/$p)
 288
 289                         # If the todo reordered commits, and our parent is marked for
 290                         # rewriting, but hasn't been gotten to yet, assume the user meant to
 291                         # drop it on top of the current HEAD
 292                         if test -z "$new_p"
 293                         then
 294                                 new_p=$(git rev-parse HEAD)
 295                         fi
 296
 297                         test $p != $new_p && fast_forward=f
 298                         case "$new_parents" in
 299                         *$new_p*)
 300                                 ;; # do nothing; that parent is already there
 301                         *)
 302                                 new_parents="$new_parents $new_p"
 303                                 ;;
 304                         esac
 305                 else
 306                         if test -f "$DROPPED"/$p
 307                         then
 308                                 fast_forward=f
 309                                 replacement="$(cat "$DROPPED"/$p)"
 310                                 test -z "$replacement" && replacement=root
 311                                 pend=" $replacement$pend"
 312                         else
 313                                 new_parents="$new_parents $p"
 314                         fi
 315                 fi
 316         done
 317         case $fast_forward in
 318         t)
 319                 output warn "Fast-forward to $sha1"
 320                 output git reset --hard $sha1 ||
 321                         die "Cannot fast-forward to $sha1"
 322                 ;;
 323         f)
 324                 first_parent=$(expr "$new_parents" : ' \([^ ]*\)')
 325
 326                 if [ "$1" != "-n" ]
 327                 then
 328                         # detach HEAD to current parent
 329                         output git checkout $first_parent 2> /dev/null ||
 330                                 die "Cannot move HEAD to $first_parent"
 331                 fi
 332
 333                 case "$new_parents" in
 334                 ' '*' '*)
 335                         test "a$1" = a-n && die "Refusing to squash a merge: $sha1"
 336
 337                         # redo merge
 338                         author_script=$(get_author_ident_from_commit $sha1)
 339                         eval "$author_script"
 340                         msg="$(commit_message $sha1)"
 341                         # No point in merging the first parent, that's HEAD
 342                         new_parents=${new_parents# $first_parent}
 343                         if ! do_with_author output \
 344                                 git merge $STRATEGY -m "$msg" $new_parents
 345                         then
 346                                 printf "%s\n" "$msg" > "$GIT_DIR"/MERGE_MSG
 347                                 die_with_patch $sha1 "Error redoing merge $sha1"
 348                         fi
 349                         ;;
 350                 *)
 351                         output git cherry-pick "$@" ||
 352                                 die_with_patch $sha1 "Could not pick $sha1"
 353                         ;;
 354                 esac
 355                 ;;
 356         esac
 357 }
 358
 359 nth_string () {
 360         case "$1" in
 361         *1[0-9]|*[04-9]) echo "$1"th;;
 362         *1) echo "$1"st;;
 363         *2) echo "$1"nd;;
 364         *3) echo "$1"rd;;
 365         esac
 366 }
 367
 368 update_squash_messages () {
 369         if test -f "$SQUASH_MSG"; then
 370                 mv "$SQUASH_MSG" "$SQUASH_MSG".bak || exit
 371                 COUNT=$(($(sed -n \
 372                         -e "1s/^# This is a combination of \(.*\) commits\./\1/p" \
 373                         -e "q" < "$SQUASH_MSG".bak)+1))
 374                 {
 375                         echo "# This is a combination of $COUNT commits."
 376                         sed -e 1d -e '2,/^./{
 377                                 /^$/d
 378                         }' <"$SQUASH_MSG".bak
 379                 } >$SQUASH_MSG
 380         else
 381                 commit_message HEAD > "$FIXUP_MSG" || die "Cannot write $FIXUP_MSG"
 382                 COUNT=2
 383                 {
 384                         echo "# This is a combination of 2 commits."
 385                         echo "# The first commit's message is:"
 386                         echo
 387                         cat "$FIXUP_MSG"
 388                 } >$SQUASH_MSG
 389         fi
 390         case $1 in
 391         squash)
 392                 rm -f "$FIXUP_MSG"
 393                 echo
 394                 echo "# This is the $(nth_string $COUNT) commit message:"
 395                 echo
 396                 commit_message $2
 397                 ;;
 398         fixup)
 399                 echo
 400                 echo "# The $(nth_string $COUNT) commit message will be skipped:"
 401                 echo
 402                 commit_message $2 | sed -e 's/^/#       /'
 403                 ;;
 404         esac >>$SQUASH_MSG
 405 }
 406
 407 peek_next_command () {
 408         sed -n -e "/^#/d" -e "/^$/d" -e "s/ .*//p" -e "q" < "$TODO"
 409 }
 410
 411 do_next () {
 412         rm -f "$MSG" "$AUTHOR_SCRIPT" "$AMEND" || exit
 413         read command sha1 rest < "$TODO"
 414         case "$command" in
 415         '#'*|''|noop)
 416                 mark_action_done
 417                 ;;
 418         pick|p)
 419                 comment_for_reflog pick
 420
 421                 mark_action_done
 422                 pick_one $sha1 ||
 423                         die_with_patch $sha1 "Could not apply $sha1... $rest"
 424                 ;;
 425         reword|r)
 426                 comment_for_reflog reword
 427
 428                 mark_action_done
 429                 pick_one $sha1 ||
 430                         die_with_patch $sha1 "Could not apply $sha1... $rest"
 431                 git commit --amend
 432                 ;;
 433         edit|e)
 434                 comment_for_reflog edit
 435
 436                 mark_action_done
 437                 pick_one $sha1 ||
 438                         die_with_patch $sha1 "Could not apply $sha1... $rest"
 439                 make_patch $sha1
 440                 git rev-parse --verify HEAD > "$AMEND"
 441                 warn "Stopped at $sha1... $rest"
 442                 warn "You can amend the commit now, with"
 443                 warn
 444                 warn "  git commit --amend"
 445                 warn
 446                 warn "Once you are satisfied with your changes, run"
 447                 warn
 448                 warn "  git rebase --continue"
 449                 warn
 450                 exit 0
 451                 ;;
 452         squash|s|fixup|f)
 453                 case "$command" in
 454                 squash|s)
 455                         squash_style=squash
 456                         ;;
 457                 fixup|f)
 458                         squash_style=fixup
 459                         ;;
 460                 esac
 461                 comment_for_reflog $squash_style
 462
 463                 test -f "$DONE" && has_action "$DONE" ||
 464                         die "Cannot '$squash_style' without a previous commit"
 465
 466                 mark_action_done
 467                 update_squash_messages $squash_style $sha1
 468                 failed=f
 469                 author_script=$(get_author_ident_from_commit HEAD)
 470                 echo "$author_script" > "$AUTHOR_SCRIPT"
 471                 eval "$author_script"
 472                 output git reset --soft HEAD^
 473                 pick_one -n $sha1 || failed=t
 474                 case "$(peek_next_command)" in
 475                 squash|s|fixup|f)
 476                         # This is an intermediate commit; its message will only be
 477                         # used in case of trouble.  So use the long version:
 478                         if test $failed = f
 479                         then
 480                                 do_with_author output git commit --no-verify -F "$SQUASH_MSG" ||
 481                                         failed=t
 482                         fi
 483                         if test $failed = t
 484                         then
 485                                 cp "$SQUASH_MSG" "$MSG" || exit
 486                                 # After any kind of hiccup, prevent committing without
 487                                 # opening the commit message editor:
 488                                 rm -f "$FIXUP_MSG"
 489                                 cp "$MSG" "$GIT_DIR"/MERGE_MSG || exit
 490                                 warn
 491                                 warn "Could not apply $sha1... $rest"
 492                                 die_with_patch $sha1 ""
 493                         fi
 494                         ;;
 495                 *)
 496                         # This is the final command of this squash/fixup group
 497                         if test $failed = f
 498                         then
 499                                 if test -f "$FIXUP_MSG"
 500                                 then
 501                                         do_with_author git commit --no-verify -F "$FIXUP_MSG" ||
 502                                                 failed=t
 503                                 else
 504                                         cp "$SQUASH_MSG" "$GIT_DIR"/SQUASH_MSG || exit
 505                                         rm -f "$GIT_DIR"/MERGE_MSG
 506                                         do_with_author git commit --no-verify -e ||
 507                                                 failed=t
 508                                 fi
 509                         fi
 510                         rm -f "$FIXUP_MSG"
 511                         if test $failed = t
 512                         then
 513                                 mv "$SQUASH_MSG" "$MSG" || exit
 514                                 cp "$MSG" "$GIT_DIR"/MERGE_MSG || exit
 515                                 warn
 516                                 warn "Could not apply $sha1... $rest"
 517                                 die_with_patch $sha1 ""
 518                         fi
 519                         rm -f "$SQUASH_MSG"
 520                         ;;
 521                 esac
 522                 ;;
 523         *)
 524                 warn "Unknown command: $command $sha1 $rest"
 525                 if git rev-parse --verify -q "$sha1" >/dev/null
 526                 then
 527                         die_with_patch $sha1 "Please fix this in the file $TODO."
 528                 else
 529                         die "Please fix this in the file $TODO."
 530                 fi
 531                 ;;
 532         esac
 533         test -s "$TODO" && return
 534
 535         comment_for_reflog finish &&
 536         HEADNAME=$(cat "$DOTEST"/head-name) &&
 537         OLDHEAD=$(cat "$DOTEST"/head) &&
 538         SHORTONTO=$(git rev-parse --short $(cat "$DOTEST"/onto)) &&
 539         NEWHEAD=$(git rev-parse HEAD) &&
 540         case $HEADNAME in
 541         refs/*)
 542                 message="$GIT_REFLOG_ACTION: $HEADNAME onto $SHORTONTO" &&
 543                 git update-ref -m "$message" $HEADNAME $NEWHEAD $OLDHEAD &&
 544                 git symbolic-ref HEAD $HEADNAME
 545                 ;;
 546         esac && {
 547                 test ! -f "$DOTEST"/verbose ||
 548                         git diff-tree --stat $(cat "$DOTEST"/head)..HEAD
 549         } &&
 550         rm -rf "$DOTEST" &&
 551         git gc --auto &&
 552         warn "Successfully rebased and updated $HEADNAME."
 553
 554         exit
 555 }
 556
 557 do_rest () {
 558         while :
 559         do
 560                 do_next
 561         done
 562 }
 563
 564 # skip picking commits whose parents are unchanged
 565 skip_unnecessary_picks () {
 566         fd=3
 567         while read command sha1 rest
 568         do
 569                 # fd=3 means we skip the command
 570                 case "$fd,$command,$(git rev-parse --verify --quiet $sha1^)" in
 571                 3,pick,"$ONTO"*|3,p,"$ONTO"*)
 572                         # pick a commit whose parent is current $ONTO -> skip
 573                         ONTO=$sha1
 574                         ;;
 575                 3,#*|3,,*)
 576                         # copy comments
 577                         ;;
 578                 *)
 579                         fd=1
 580                         ;;
 581                 esac
 582                 echo "$command${sha1:+ }$sha1${rest:+ }$rest" >&$fd
 583         done <"$TODO" >"$TODO.new" 3>>"$DONE" &&
 584         mv -f "$TODO".new "$TODO" ||
 585         die "Could not skip unnecessary pick commands"
 586 }
 587
 588 # check if no other options are set
 589 is_standalone () {
 590         test $# -eq 2 -a "$2" = '--' &&
 591         test -z "$ONTO" &&
 592         test -z "$PRESERVE_MERGES" &&
 593         test -z "$STRATEGY" &&
 594         test -z "$VERBOSE"
 595 }
 596
 597 get_saved_options () {
 598         test -d "$REWRITTEN" && PRESERVE_MERGES=t
 599         test -f "$DOTEST"/strategy && STRATEGY="$(cat "$DOTEST"/strategy)"
 600         test -f "$DOTEST"/verbose && VERBOSE=t
 601         test -f "$DOTEST"/rebase-root && REBASE_ROOT=t
 602 }
 603
 604 while test $# != 0
 605 do
 606         case "$1" in
 607         --no-verify)
 608                 OK_TO_SKIP_PRE_REBASE=yes
 609                 ;;
 610         --verify)
 611                 ;;
 612         --continue)
 613                 is_standalone "$@" || usage
 614                 get_saved_options
 615                 comment_for_reflog continue
 616
 617                 test -d "$DOTEST" || die "No interactive rebase running"
 618
 619                 # Sanity check
 620                 git rev-parse --verify HEAD >/dev/null ||
 621                         die "Cannot read HEAD"
 622                 git update-index --ignore-submodules --refresh &&
 623                         git diff-files --quiet --ignore-submodules ||
 624                         die "Working tree is dirty"
 625
 626                 # do we have anything to commit?
 627                 if git diff-index --cached --quiet --ignore-submodules HEAD --
 628                 then
 629                         : Nothing to commit -- skip this
 630                 else
 631                         . "$AUTHOR_SCRIPT" ||
 632                                 die "Cannot find the author identity"
 633                         amend=
 634                         if test -f "$AMEND"
 635                         then
 636                                 amend=$(git rev-parse --verify HEAD)
 637                                 test "$amend" = $(cat "$AMEND") ||
 638                                 die "\
 639 You have uncommitted changes in your working tree. Please, commit them
 640 first and then run 'git rebase --continue' again."
 641                                 git reset --soft HEAD^ ||
 642                                 die "Cannot rewind the HEAD"
 643                         fi
 644                         do_with_author git commit --no-verify -F "$MSG" -e || {
 645                                 test -n "$amend" && git reset --soft $amend
 646                                 die "Could not commit staged changes."
 647                         }
 648                 fi
 649
 650                 require_clean_work_tree
 651                 do_rest
 652                 ;;
 653         --abort)
 654                 is_standalone "$@" || usage
 655                 get_saved_options
 656                 comment_for_reflog abort
 657
 658                 git rerere clear
 659                 test -d "$DOTEST" || die "No interactive rebase running"
 660
 661                 HEADNAME=$(cat "$DOTEST"/head-name)
 662                 HEAD=$(cat "$DOTEST"/head)
 663                 case $HEADNAME in
 664                 refs/*)
 665                         git symbolic-ref HEAD $HEADNAME
 666                         ;;
 667                 esac &&
 668                 output git reset --hard $HEAD &&
 669                 rm -rf "$DOTEST"
 670                 exit
 671                 ;;
 672         --skip)
 673                 is_standalone "$@" || usage
 674                 get_saved_options
 675                 comment_for_reflog skip
 676
 677                 git rerere clear
 678                 test -d "$DOTEST" || die "No interactive rebase running"
 679
 680                 output git reset --hard && do_rest
 681                 ;;
 682         -s)
 683                 case "$#,$1" in
 684                 *,*=*)
 685                         STRATEGY="-s "$(expr "z$1" : 'z-[^=]*=\(.*\)') ;;
 686                 1,*)
 687                         usage ;;
 688                 *)
 689                         STRATEGY="-s $2"
 690                         shift ;;
 691                 esac
 692                 ;;
 693         -m)
 694                 # we use merge anyway
 695                 ;;
 696         -v)
 697                 VERBOSE=t
 698                 ;;
 699         -p)
 700                 PRESERVE_MERGES=t
 701                 ;;
 702         -i)
 703                 # yeah, we know
 704                 ;;
 705         --root)
 706                 REBASE_ROOT=t
 707                 ;;
 708         --onto)
 709                 shift
 710                 ONTO=$(git rev-parse --verify "$1") ||
 711                         die "Does not point to a valid commit: $1"
 712                 ;;
 713         --)
 714                 shift
 715                 test -z "$REBASE_ROOT" -a $# -ge 1 -a $# -le 2 ||
 716                 test ! -z "$REBASE_ROOT" -a $# -le 1 || usage
 717                 test -d "$DOTEST" &&
 718                         die "Interactive rebase already started"
 719
 720                 git var GIT_COMMITTER_IDENT >/dev/null ||
 721                         die "You need to set your committer info first"
 722
 723                 if test -z "$REBASE_ROOT"
 724                 then
 725                         UPSTREAM_ARG="$1"
 726                         UPSTREAM=$(git rev-parse --verify "$1") || die "Invalid base"
 727                         test -z "$ONTO" && ONTO=$UPSTREAM
 728                         shift
 729                 else
 730                         UPSTREAM=
 731                         UPSTREAM_ARG=--root
 732                         test -z "$ONTO" &&
 733                                 die "You must specify --onto when using --root"
 734                 fi
 735                 run_pre_rebase_hook "$UPSTREAM_ARG" "$@"
 736
 737                 comment_for_reflog start
 738
 739                 require_clean_work_tree
 740
 741                 if test ! -z "$1"
 742                 then
 743                         output git show-ref --verify --quiet "refs/heads/$1" ||
 744                                 die "Invalid branchname: $1"
 745                         output git checkout "$1" ||
 746                                 die "Could not checkout $1"
 747                 fi
 748
 749                 HEAD=$(git rev-parse --verify HEAD) || die "No HEAD?"
 750                 mkdir "$DOTEST" || die "Could not create temporary $DOTEST"
 751
 752                 : > "$DOTEST"/interactive || die "Could not mark as interactive"
 753                 git symbolic-ref HEAD > "$DOTEST"/head-name 2> /dev/null ||
 754                         echo "detached HEAD" > "$DOTEST"/head-name
 755
 756                 echo $HEAD > "$DOTEST"/head
 757                 case "$REBASE_ROOT" in
 758                 '')
 759                         rm -f "$DOTEST"/rebase-root ;;
 760                 *)
 761                         : >"$DOTEST"/rebase-root ;;
 762                 esac
 763                 echo $ONTO > "$DOTEST"/onto
 764                 test -z "$STRATEGY" || echo "$STRATEGY" > "$DOTEST"/strategy
 765                 test t = "$VERBOSE" && : > "$DOTEST"/verbose
 766                 if test t = "$PRESERVE_MERGES"
 767                 then
 768                         if test -z "$REBASE_ROOT"
 769                         then
 770                                 mkdir "$REWRITTEN" &&
 771                                 for c in $(git merge-base --all $HEAD $UPSTREAM)
 772                                 do
 773                                         echo $ONTO > "$REWRITTEN"/$c ||
 774                                                 die "Could not init rewritten commits"
 775                                 done
 776                         else
 777                                 mkdir "$REWRITTEN" &&
 778                                 echo $ONTO > "$REWRITTEN"/root ||
 779                                         die "Could not init rewritten commits"
 780                         fi
 781                         # No cherry-pick because our first pass is to determine
 782                         # parents to rewrite and skipping dropped commits would
 783                         # prematurely end our probe
 784                         MERGES_OPTION=
 785                         first_after_upstream="$(git rev-list --reverse --first-parent $UPSTREAM..$HEAD | head -n 1)"
 786                 else
 787                         MERGES_OPTION="--no-merges --cherry-pick"
 788                 fi
 789
 790                 SHORTHEAD=$(git rev-parse --short $HEAD)
 791                 SHORTONTO=$(git rev-parse --short $ONTO)
 792                 if test -z "$REBASE_ROOT"
 793                         # this is now equivalent to ! -z "$UPSTREAM"
 794                 then
 795                         SHORTUPSTREAM=$(git rev-parse --short $UPSTREAM)
 796                         REVISIONS=$UPSTREAM...$HEAD
 797                         SHORTREVISIONS=$SHORTUPSTREAM..$SHORTHEAD
 798                 else
 799                         REVISIONS=$ONTO...$HEAD
 800                         SHORTREVISIONS=$SHORTHEAD
 801                 fi
 802                 git rev-list $MERGES_OPTION --pretty=oneline --abbrev-commit \
 803                         --abbrev=7 --reverse --left-right --topo-order \
 804                         $REVISIONS | \
 805                         sed -n "s/^>//p" | while read shortsha1 rest
 806                 do
 807                         if test t != "$PRESERVE_MERGES"
 808                         then
 809                                 echo "pick $shortsha1 $rest" >> "$TODO"
 810                         else
 811                                 sha1=$(git rev-parse $shortsha1)
 812                                 if test -z "$REBASE_ROOT"
 813                                 then
 814                                         preserve=t
 815                                         for p in $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)
 816                                         do
 817                                                 if test -f "$REWRITTEN"/$p -a \( $p != $ONTO -o $sha1 = $first_after_upstream \)
 818                                                 then
 819                                                         preserve=f
 820                                                 fi
 821                                         done
 822                                 else
 823                                         preserve=f
 824                                 fi
 825                                 if test f = "$preserve"
 826                                 then
 827                                         touch "$REWRITTEN"/$sha1
 828                                         echo "pick $shortsha1 $rest" >> "$TODO"
 829                                 fi
 830                         fi
 831                 done
 832
 833                 # Watch for commits that been dropped by --cherry-pick
 834                 if test t = "$PRESERVE_MERGES"
 835                 then
 836                         mkdir "$DROPPED"
 837                         # Save all non-cherry-picked changes
 838                         git rev-list $REVISIONS --left-right --cherry-pick | \
 839                                 sed -n "s/^>//p" > "$DOTEST"/not-cherry-picks
 840                         # Now all commits and note which ones are missing in
 841                         # not-cherry-picks and hence being dropped
 842                         git rev-list $REVISIONS |
 843                         while read rev
 844                         do
 845                                 if test -f "$REWRITTEN"/$rev -a "$(sane_grep "$rev" "$DOTEST"/not-cherry-picks)" = ""
 846                                 then
 847                                         # Use -f2 because if rev-list is telling us this commit is
 848                                         # not worthwhile, we don't want to track its multiple heads,
 849                                         # just the history of its first-parent for others that will
 850                                         # be rebasing on top of it
 851                                         git rev-list --parents -1 $rev | cut -d' ' -s -f2 > "$DROPPED"/$rev
 852                                         short=$(git rev-list -1 --abbrev-commit --abbrev=7 $rev)
 853                                         sane_grep -v "^[a-z][a-z]* $short" <"$TODO" > "${TODO}2" ; mv "${TODO}2" "$TODO"
 854                                         rm "$REWRITTEN"/$rev
 855                                 fi
 856                         done
 857                 fi
 858
 859                 test -s "$TODO" || echo noop >> "$TODO"
 860                 cat >> "$TODO" << EOF
 861
 862 # Rebase $SHORTREVISIONS onto $SHORTONTO
 863 #
 864 # Commands:
 865 #  p, pick = use commit
 866 #  r, reword = use commit, but edit the commit message
 867 #  e, edit = use commit, but stop for amending
 868 #  s, squash = use commit, but meld into previous commit
 869 #  f, fixup = like "squash", but discard this commit's log message
 870 #
 871 # If you remove a line here THAT COMMIT WILL BE LOST.
 872 # However, if you remove everything, the rebase will be aborted.
 873 #
 874 EOF
 875
 876                 has_action "$TODO" ||
 877                         die_abort "Nothing to do"
 878
 879                 cp "$TODO" "$TODO".backup
 880                 git_editor "$TODO" ||
 881                         die "Could not execute editor"
 882
 883                 has_action "$TODO" ||
 884                         die_abort "Nothing to do"
 885
 886                 test -d "$REWRITTEN" || skip_unnecessary_picks
 887
 888                 git update-ref ORIG_HEAD $HEAD
 889                 output git checkout $ONTO && do_rest
 890                 ;;
 891         esac
 892         shift
 893 done