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 "
  30
  31 . git-sh-setup
  32 require_work_tree
  33
  34 DOTEST="$GIT_DIR/rebase-merge"
  35 TODO="$DOTEST"/git-rebase-todo
  36 DONE="$DOTEST"/done
  37 MSG="$DOTEST"/message
  38 SQUASH_MSG="$DOTEST"/message-squash
  39 REWRITTEN="$DOTEST"/rewritten
  40 DROPPED="$DOTEST"/dropped
  41 PRESERVE_MERGES=
  42 STRATEGY=
  43 ONTO=
  44 VERBOSE=
  45
  46 GIT_CHERRY_PICK_HELP="  After resolving the conflicts,
  47 mark the corrected paths with 'git add <paths>', and
  48 run 'git rebase --continue'"
  49 export GIT_CHERRY_PICK_HELP
  50
  51 warn () {
  52         echo "$*" >&2
  53 }
  54
  55 output () {
  56         case "$VERBOSE" in
  57         '')
  58                 output=$("$@" 2>&1 )
  59                 status=$?
  60                 test $status != 0 && printf "%s\n" "$output"
  61                 return $status
  62                 ;;
  63         *)
  64                 "$@"
  65                 ;;
  66         esac
  67 }
  68
  69 run_pre_rebase_hook () {
  70         if test -x "$GIT_DIR/hooks/pre-rebase"
  71         then
  72                 "$GIT_DIR/hooks/pre-rebase" ${1+"$@"} || {
  73                         echo >&2 "The pre-rebase hook refused to rebase."
  74                         exit 1
  75                 }
  76         fi
  77 }
  78
  79 require_clean_work_tree () {
  80         # test if working tree is dirty
  81         git rev-parse --verify HEAD > /dev/null &&
  82         git update-index --ignore-submodules --refresh &&
  83         git diff-files --quiet --ignore-submodules &&
  84         git diff-index --cached --quiet HEAD --ignore-submodules -- ||
  85         die "Working tree is dirty"
  86 }
  87
  88 ORIG_REFLOG_ACTION="$GIT_REFLOG_ACTION"
  89
  90 comment_for_reflog () {
  91         case "$ORIG_REFLOG_ACTION" in
  92         ''|rebase*)
  93                 GIT_REFLOG_ACTION="rebase -i ($1)"
  94                 export GIT_REFLOG_ACTION
  95                 ;;
  96         esac
  97 }
  98
  99 last_count=
 100 mark_action_done () {
 101         sed -e 1q < "$TODO" >> "$DONE"
 102         sed -e 1d < "$TODO" >> "$TODO".new
 103         mv -f "$TODO".new "$TODO"
 104         count=$(grep -c '^[^#]' < "$DONE")
 105         total=$(($count+$(grep -c '^[^#]' < "$TODO")))
 106         if test "$last_count" != "$count"
 107         then
 108                 last_count=$count
 109                 printf "Rebasing (%d/%d)\r" $count $total
 110                 test -z "$VERBOSE" || echo
 111         fi
 112 }
 113
 114 make_patch () {
 115         parent_sha1=$(git rev-parse --verify "$1"^) ||
 116                 die "Cannot get patch for $1^"
 117         git diff-tree -p "$parent_sha1".."$1" > "$DOTEST"/patch
 118         test -f "$DOTEST"/message ||
 119                 git cat-file commit "$1" | sed "1,/^$/d" > "$DOTEST"/message
 120         test -f "$DOTEST"/author-script ||
 121                 get_author_ident_from_commit "$1" > "$DOTEST"/author-script
 122 }
 123
 124 die_with_patch () {
 125         make_patch "$1"
 126         git rerere
 127         die "$2"
 128 }
 129
 130 die_abort () {
 131         rm -rf "$DOTEST"
 132         die "$1"
 133 }
 134
 135 has_action () {
 136         grep '^[^#]' "$1" >/dev/null
 137 }
 138
 139 pick_one () {
 140         no_ff=
 141         case "$1" in -n) sha1=$2; no_ff=t ;; *) sha1=$1 ;; esac
 142         output git rev-parse --verify $sha1 || die "Invalid commit name: $sha1"
 143         test -d "$REWRITTEN" &&
 144                 pick_one_preserving_merges "$@" && return
 145         parent_sha1=$(git rev-parse --verify $sha1^) ||
 146                 die "Could not get the parent of $sha1"
 147         current_sha1=$(git rev-parse --verify HEAD)
 148         if test "$no_ff$current_sha1" = "$parent_sha1"; then
 149                 output git reset --hard $sha1
 150                 test "a$1" = a-n && output git reset --soft $current_sha1
 151                 sha1=$(git rev-parse --short $sha1)
 152                 output warn Fast forward to $sha1
 153         else
 154                 output git cherry-pick "$@"
 155         fi
 156 }
 157
 158 pick_one_preserving_merges () {
 159         fast_forward=t
 160         case "$1" in
 161         -n)
 162                 fast_forward=f
 163                 sha1=$2
 164                 ;;
 165         *)
 166                 sha1=$1
 167                 ;;
 168         esac
 169         sha1=$(git rev-parse $sha1)
 170
 171         if test -f "$DOTEST"/current-commit
 172         then
 173                 if [ "$fast_forward" == "t" ]
 174                 then
 175                         cat "$DOTEST"/current-commit | while read current_commit
 176                         do
 177                                 git rev-parse HEAD > "$REWRITTEN"/$current_commit
 178                         done
 179                         rm "$DOTEST"/current-commit ||
 180                         die "Cannot write current commit's replacement sha1"
 181                 fi
 182         fi
 183
 184         echo $sha1 >> "$DOTEST"/current-commit
 185
 186         # rewrite parents; if none were rewritten, we can fast-forward.
 187         new_parents=
 188         pend=" $(git rev-list --parents -1 $sha1 | cut -d' ' -f2-)"
 189         while [ "$pend" != "" ]
 190         do
 191                 p=$(expr "$pend" : ' \([^ ]*\)')
 192                 pend="${pend# $p}"
 193
 194                 if test -f "$REWRITTEN"/$p
 195                 then
 196                         new_p=$(cat "$REWRITTEN"/$p)
 197
 198                         # If the todo reordered commits, and our parent is marked for
 199                         # rewriting, but hasn't been gotten to yet, assume the user meant to
 200                         # drop it on top of the current HEAD
 201                         if test -z "$new_p"
 202                         then
 203                                 new_p=$(git rev-parse HEAD)
 204                         fi
 205
 206                         test $p != $new_p && fast_forward=f
 207                         case "$new_parents" in
 208                         *$new_p*)
 209                                 ;; # do nothing; that parent is already there
 210                         *)
 211                                 new_parents="$new_parents $new_p"
 212                                 ;;
 213                         esac
 214                 else
 215                         if test -f "$DROPPED"/$p
 216                         then
 217                                 fast_forward=f
 218                                 pend=" $(cat "$DROPPED"/$p)$pend"
 219                         else
 220                                 new_parents="$new_parents $p"
 221                         fi
 222                 fi
 223         done
 224         case $fast_forward in
 225         t)
 226                 output warn "Fast forward to $sha1"
 227                 output git reset --hard $sha1 ||
 228                         die "Cannot fast forward to $sha1"
 229                 ;;
 230         f)
 231                 first_parent=$(expr "$new_parents" : ' \([^ ]*\)')
 232
 233                 if [ "$1" != "-n" ]
 234                 then
 235                         # detach HEAD to current parent
 236                         output git checkout $first_parent 2> /dev/null ||
 237                                 die "Cannot move HEAD to $first_parent"
 238                 fi
 239
 240                 case "$new_parents" in
 241                 ' '*' '*)
 242                         test "a$1" = a-n && die "Refusing to squash a merge: $sha1"
 243
 244                         # redo merge
 245                         author_script=$(get_author_ident_from_commit $sha1)
 246                         eval "$author_script"
 247                         msg="$(git cat-file commit $sha1 | sed -e '1,/^$/d')"
 248                         # No point in merging the first parent, that's HEAD
 249                         new_parents=${new_parents# $first_parent}
 250                         if ! GIT_AUTHOR_NAME="$GIT_AUTHOR_NAME" \
 251                                 GIT_AUTHOR_EMAIL="$GIT_AUTHOR_EMAIL" \
 252                                 GIT_AUTHOR_DATE="$GIT_AUTHOR_DATE" \
 253                                 output git merge $STRATEGY -m "$msg" \
 254                                         $new_parents
 255                         then
 256                                 git rerere
 257                                 printf "%s\n" "$msg" > "$GIT_DIR"/MERGE_MSG
 258                                 die Error redoing merge $sha1
 259                         fi
 260                         ;;
 261                 *)
 262                         output git cherry-pick "$@" ||
 263                                 die_with_patch $sha1 "Could not pick $sha1"
 264                         ;;
 265                 esac
 266                 ;;
 267         esac
 268 }
 269
 270 nth_string () {
 271         case "$1" in
 272         *1[0-9]|*[04-9]) echo "$1"th;;
 273         *1) echo "$1"st;;
 274         *2) echo "$1"nd;;
 275         *3) echo "$1"rd;;
 276         esac
 277 }
 278
 279 make_squash_message () {
 280         if test -f "$SQUASH_MSG"; then
 281                 COUNT=$(($(sed -n "s/^# This is [^0-9]*\([1-9][0-9]*\).*/\1/p" \
 282                         < "$SQUASH_MSG" | sed -ne '$p')+1))
 283                 echo "# This is a combination of $COUNT commits."
 284                 sed -e 1d -e '2,/^./{
 285                         /^$/d
 286                 }' <"$SQUASH_MSG"
 287         else
 288                 COUNT=2
 289                 echo "# This is a combination of two commits."
 290                 echo "# The first commit's message is:"
 291                 echo
 292                 git cat-file commit HEAD | sed -e '1,/^$/d'
 293         fi
 294         echo
 295         echo "# This is the $(nth_string $COUNT) commit message:"
 296         echo
 297         git cat-file commit $1 | sed -e '1,/^$/d'
 298 }
 299
 300 peek_next_command () {
 301         sed -n "1s/ .*$//p" < "$TODO"
 302 }
 303
 304 do_next () {
 305         rm -f "$DOTEST"/message "$DOTEST"/author-script \
 306                 "$DOTEST"/amend || exit
 307         read command sha1 rest < "$TODO"
 308         case "$command" in
 309         '#'*|''|noop)
 310                 mark_action_done
 311                 ;;
 312         pick|p)
 313                 comment_for_reflog pick
 314
 315                 mark_action_done
 316                 pick_one $sha1 ||
 317                         die_with_patch $sha1 "Could not apply $sha1... $rest"
 318                 ;;
 319         edit|e)
 320                 comment_for_reflog edit
 321
 322                 mark_action_done
 323                 pick_one $sha1 ||
 324                         die_with_patch $sha1 "Could not apply $sha1... $rest"
 325                 make_patch $sha1
 326                 git rev-parse --verify HEAD > "$DOTEST"/amend
 327                 warn "Stopped at $sha1... $rest"
 328                 warn "You can amend the commit now, with"
 329                 warn
 330                 warn "  git commit --amend"
 331                 warn
 332                 warn "Once you are satisfied with your changes, run"
 333                 warn
 334                 warn "  git rebase --continue"
 335                 warn
 336                 exit 0
 337                 ;;
 338         squash|s)
 339                 comment_for_reflog squash
 340
 341                 has_action "$DONE" ||
 342                         die "Cannot 'squash' without a previous commit"
 343
 344                 mark_action_done
 345                 make_squash_message $sha1 > "$MSG"
 346                 failed=f
 347                 author_script=$(get_author_ident_from_commit HEAD)
 348                 output git reset --soft HEAD^
 349                 pick_one -n $sha1 || failed=t
 350                 case "$(peek_next_command)" in
 351                 squash|s)
 352                         EDIT_COMMIT=
 353                         USE_OUTPUT=output
 354                         MSG_OPT=-F
 355                         MSG_FILE="$MSG"
 356                         cp "$MSG" "$SQUASH_MSG"
 357                         ;;
 358                 *)
 359                         EDIT_COMMIT=-e
 360                         USE_OUTPUT=
 361                         MSG_OPT=
 362                         MSG_FILE=
 363                         rm -f "$SQUASH_MSG" || exit
 364                         cp "$MSG" "$GIT_DIR"/SQUASH_MSG
 365                         rm -f "$GIT_DIR"/MERGE_MSG || exit
 366                         ;;
 367                 esac
 368                 echo "$author_script" > "$DOTEST"/author-script
 369                 if test $failed = f
 370                 then
 371                         # This is like --amend, but with a different message
 372                         eval "$author_script"
 373                         GIT_AUTHOR_NAME="$GIT_AUTHOR_NAME" \
 374                         GIT_AUTHOR_EMAIL="$GIT_AUTHOR_EMAIL" \
 375                         GIT_AUTHOR_DATE="$GIT_AUTHOR_DATE" \
 376                         $USE_OUTPUT git commit --no-verify $MSG_OPT "$MSG_FILE" $EDIT_COMMIT || failed=t
 377                 fi
 378                 if test $failed = t
 379                 then
 380                         cp "$MSG" "$GIT_DIR"/MERGE_MSG
 381                         warn
 382                         warn "Could not apply $sha1... $rest"
 383                         die_with_patch $sha1 ""
 384                 fi
 385                 ;;
 386         *)
 387                 warn "Unknown command: $command $sha1 $rest"
 388                 die_with_patch $sha1 "Please fix this in the file $TODO."
 389                 ;;
 390         esac
 391         test -s "$TODO" && return
 392
 393         comment_for_reflog finish &&
 394         HEADNAME=$(cat "$DOTEST"/head-name) &&
 395         OLDHEAD=$(cat "$DOTEST"/head) &&
 396         SHORTONTO=$(git rev-parse --short $(cat "$DOTEST"/onto)) &&
 397         NEWHEAD=$(git rev-parse HEAD) &&
 398         case $HEADNAME in
 399         refs/*)
 400                 message="$GIT_REFLOG_ACTION: $HEADNAME onto $SHORTONTO)" &&
 401                 git update-ref -m "$message" $HEADNAME $NEWHEAD $OLDHEAD &&
 402                 git symbolic-ref HEAD $HEADNAME
 403                 ;;
 404         esac && {
 405                 test ! -f "$DOTEST"/verbose ||
 406                         git diff-tree --stat $(cat "$DOTEST"/head)..HEAD
 407         } &&
 408         rm -rf "$DOTEST" &&
 409         git gc --auto &&
 410         warn "Successfully rebased and updated $HEADNAME."
 411
 412         exit
 413 }
 414
 415 do_rest () {
 416         while :
 417         do
 418                 do_next
 419         done
 420 }
 421
 422 # check if no other options are set
 423 is_standalone () {
 424         test $# -eq 2 -a "$2" = '--' &&
 425         test -z "$ONTO" &&
 426         test -z "$PRESERVE_MERGES" &&
 427         test -z "$STRATEGY" &&
 428         test -z "$VERBOSE"
 429 }
 430
 431 get_saved_options () {
 432         test -d "$REWRITTEN" && PRESERVE_MERGES=t
 433         test -f "$DOTEST"/strategy && STRATEGY="$(cat "$DOTEST"/strategy)"
 434         test -f "$DOTEST"/verbose && VERBOSE=t
 435 }
 436
 437 while test $# != 0
 438 do
 439         case "$1" in
 440         --continue)
 441                 is_standalone "$@" || usage
 442                 get_saved_options
 443                 comment_for_reflog continue
 444
 445                 test -d "$DOTEST" || die "No interactive rebase running"
 446
 447                 # Sanity check
 448                 git rev-parse --verify HEAD >/dev/null ||
 449                         die "Cannot read HEAD"
 450                 git update-index --ignore-submodules --refresh &&
 451                         git diff-files --quiet --ignore-submodules ||
 452                         die "Working tree is dirty"
 453
 454                 # do we have anything to commit?
 455                 if git diff-index --cached --quiet --ignore-submodules HEAD --
 456                 then
 457                         : Nothing to commit -- skip this
 458                 else
 459                         . "$DOTEST"/author-script ||
 460                                 die "Cannot find the author identity"
 461                         amend=
 462                         if test -f "$DOTEST"/amend
 463                         then
 464                                 amend=$(git rev-parse --verify HEAD)
 465                                 test "$amend" = $(cat "$DOTEST"/amend) ||
 466                                 die "\
 467 You have uncommitted changes in your working tree. Please, commit them
 468 first and then run 'git rebase --continue' again."
 469                                 git reset --soft HEAD^ ||
 470                                 die "Cannot rewind the HEAD"
 471                         fi
 472                         export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_AUTHOR_DATE &&
 473                         git commit --no-verify -F "$DOTEST"/message -e || {
 474                                 test -n "$amend" && git reset --soft $amend
 475                                 die "Could not commit staged changes."
 476                         }
 477                 fi
 478
 479                 require_clean_work_tree
 480                 do_rest
 481                 ;;
 482         --abort)
 483                 is_standalone "$@" || usage
 484                 get_saved_options
 485                 comment_for_reflog abort
 486
 487                 git rerere clear
 488                 test -d "$DOTEST" || die "No interactive rebase running"
 489
 490                 HEADNAME=$(cat "$DOTEST"/head-name)
 491                 HEAD=$(cat "$DOTEST"/head)
 492                 case $HEADNAME in
 493                 refs/*)
 494                         git symbolic-ref HEAD $HEADNAME
 495                         ;;
 496                 esac &&
 497                 output git reset --hard $HEAD &&
 498                 rm -rf "$DOTEST"
 499                 exit
 500                 ;;
 501         --skip)
 502                 is_standalone "$@" || usage
 503                 get_saved_options
 504                 comment_for_reflog skip
 505
 506                 git rerere clear
 507                 test -d "$DOTEST" || die "No interactive rebase running"
 508
 509                 output git reset --hard && do_rest
 510                 ;;
 511         -s)
 512                 case "$#,$1" in
 513                 *,*=*)
 514                         STRATEGY="-s "$(expr "z$1" : 'z-[^=]*=\(.*\)') ;;
 515                 1,*)
 516                         usage ;;
 517                 *)
 518                         STRATEGY="-s $2"
 519                         shift ;;
 520                 esac
 521                 ;;
 522         -m)
 523                 # we use merge anyway
 524                 ;;
 525         -v)
 526                 VERBOSE=t
 527                 ;;
 528         -p)
 529                 PRESERVE_MERGES=t
 530                 ;;
 531         -i)
 532                 # yeah, we know
 533                 ;;
 534         --onto)
 535                 shift
 536                 ONTO=$(git rev-parse --verify "$1") ||
 537                         die "Does not point to a valid commit: $1"
 538                 ;;
 539         --)
 540                 shift
 541                 run_pre_rebase_hook ${1+"$@"}
 542                 test $# -eq 1 -o $# -eq 2 || usage
 543                 test -d "$DOTEST" &&
 544                         die "Interactive rebase already started"
 545
 546                 git var GIT_COMMITTER_IDENT >/dev/null ||
 547                         die "You need to set your committer info first"
 548
 549                 comment_for_reflog start
 550
 551                 require_clean_work_tree
 552
 553                 UPSTREAM=$(git rev-parse --verify "$1") || die "Invalid base"
 554                 test -z "$ONTO" && ONTO=$UPSTREAM
 555
 556                 if test ! -z "$2"
 557                 then
 558                         output git show-ref --verify --quiet "refs/heads/$2" ||
 559                                 die "Invalid branchname: $2"
 560                         output git checkout "$2" ||
 561                                 die "Could not checkout $2"
 562                 fi
 563
 564                 HEAD=$(git rev-parse --verify HEAD) || die "No HEAD?"
 565                 mkdir "$DOTEST" || die "Could not create temporary $DOTEST"
 566
 567                 : > "$DOTEST"/interactive || die "Could not mark as interactive"
 568                 git symbolic-ref HEAD > "$DOTEST"/head-name 2> /dev/null ||
 569                         echo "detached HEAD" > "$DOTEST"/head-name
 570
 571                 echo $HEAD > "$DOTEST"/head
 572                 echo $UPSTREAM > "$DOTEST"/upstream
 573                 echo $ONTO > "$DOTEST"/onto
 574                 test -z "$STRATEGY" || echo "$STRATEGY" > "$DOTEST"/strategy
 575                 test t = "$VERBOSE" && : > "$DOTEST"/verbose
 576                 if test t = "$PRESERVE_MERGES"
 577                 then
 578                         # $REWRITTEN contains files for each commit that is
 579                         # reachable by at least one merge base of $HEAD and
 580                         # $UPSTREAM. They are not necessarily rewritten, but
 581                         # their children might be.
 582                         # This ensures that commits on merged, but otherwise
 583                         # unrelated side branches are left alone. (Think "X"
 584                         # in the man page's example.)
 585                         mkdir "$REWRITTEN" &&
 586                         for c in $(git merge-base --all $HEAD $UPSTREAM)
 587                         do
 588                                 echo $ONTO > "$REWRITTEN"/$c ||
 589                                         die "Could not init rewritten commits"
 590                         done
 591                         # No cherry-pick because our first pass is to determine
 592                         # parents to rewrite and skipping dropped commits would
 593                         # prematurely end our probe
 594                         MERGES_OPTION=
 595                         first_after_upstream="$(git rev-list --reverse --first-parent $UPSTREAM..$HEAD | head -n 1)"
 596                 else
 597                         MERGES_OPTION="--no-merges --cherry-pick"
 598                 fi
 599
 600                 SHORTUPSTREAM=$(git rev-parse --short $UPSTREAM)
 601                 SHORTHEAD=$(git rev-parse --short $HEAD)
 602                 SHORTONTO=$(git rev-parse --short $ONTO)
 603                 git rev-list $MERGES_OPTION --pretty=oneline --abbrev-commit \
 604                         --abbrev=7 --reverse --left-right --topo-order \
 605                         $UPSTREAM...$HEAD | \
 606                         sed -n "s/^>//p" | while read shortsha1 rest
 607                 do
 608                         if test t != "$PRESERVE_MERGES"
 609                         then
 610                                 echo "pick $shortsha1 $rest" >> "$TODO"
 611                         else
 612                                 sha1=$(git rev-parse $shortsha1)
 613                                 preserve=t
 614                                 for p in $(git rev-list --parents -1 $sha1 | cut -d' ' -f2-)
 615                                 do
 616                                         if test -f "$REWRITTEN"/$p -a \( $p != $UPSTREAM -o $sha1 = $first_after_upstream \)
 617                                         then
 618                                                 preserve=f
 619                                         fi
 620                                 done
 621                                 if test f = "$preserve"
 622                                 then
 623                                         touch "$REWRITTEN"/$sha1
 624                                         echo "pick $shortsha1 $rest" >> "$TODO"
 625                                 fi
 626                         fi
 627                 done
 628
 629                 # Watch for commits that been dropped by --cherry-pick
 630                 if test t = "$PRESERVE_MERGES"
 631                 then
 632                         mkdir "$DROPPED"
 633                         # Save all non-cherry-picked changes
 634                         git rev-list $UPSTREAM...$HEAD --left-right --cherry-pick | \
 635                                 sed -n "s/^>//p" > "$DOTEST"/not-cherry-picks
 636                         # Now all commits and note which ones are missing in
 637                         # not-cherry-picks and hence being dropped
 638                         git rev-list $UPSTREAM...$HEAD --left-right | \
 639                                 sed -n "s/^>//p" | while read rev
 640                         do
 641                                 if test -f "$REWRITTEN"/$rev -a "$(grep "$rev" "$DOTEST"/not-cherry-picks)" = ""
 642                                 then
 643                                         # Use -f2 because if rev-list is telling us this commit is
 644                                         # not worthwhile, we don't want to track its multiple heads,
 645                                         # just the history of its first-parent for others that will
 646                                         # be rebasing on top of it
 647                                         git rev-list --parents -1 $rev | cut -d' ' -f2 > "$DROPPED"/$rev
 648                                         cat "$TODO" | grep -v "${rev:0:7}" > "${TODO}2" ; mv "${TODO}2" "$TODO"
 649                                         rm "$REWRITTEN"/$rev
 650                                 fi
 651                         done
 652                 fi
 653                 test -s "$TODO" || echo noop >> "$TODO"
 654                 cat >> "$TODO" << EOF
 655
 656 # Rebase $SHORTUPSTREAM..$SHORTHEAD onto $SHORTONTO
 657 #
 658 # Commands:
 659 #  p, pick = use commit
 660 #  e, edit = use commit, but stop for amending
 661 #  s, squash = use commit, but meld into previous commit
 662 #
 663 # If you remove a line here THAT COMMIT WILL BE LOST.
 664 # However, if you remove everything, the rebase will be aborted.
 665 #
 666 EOF
 667
 668                 has_action "$TODO" ||
 669                         die_abort "Nothing to do"
 670
 671                 cp "$TODO" "$TODO".backup
 672                 git_editor "$TODO" ||
 673                         die "Could not execute editor"
 674
 675                 has_action "$TODO" ||
 676                         die_abort "Nothing to do"
 677
 678                 git update-ref ORIG_HEAD $HEAD
 679                 output git checkout $ONTO && do_rest
 680                 ;;
 681         esac
 682         shift
 683 done