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 "
  31
  32 . git-sh-setup
  33 require_work_tree
  34
  35 DOTEST="$GIT_DIR/rebase-merge"
  36 TODO="$DOTEST"/git-rebase-todo
  37 DONE="$DOTEST"/done
  38 MSG="$DOTEST"/message
  39 SQUASH_MSG="$DOTEST"/message-squash
  40 REWRITTEN="$DOTEST"/rewritten
  41 DROPPED="$DOTEST"/dropped
  42 PRESERVE_MERGES=
  43 STRATEGY=
  44 ONTO=
  45 VERBOSE=
  46 OK_TO_SKIP_PRE_REBASE=
  47
  48 GIT_CHERRY_PICK_HELP="  After resolving the conflicts,
  49 mark the corrected paths with 'git add <paths>', and
  50 run 'git rebase --continue'"
  51 export GIT_CHERRY_PICK_HELP
  52
  53 warn () {
  54         echo "$*" >&2
  55 }
  56
  57 output () {
  58         case "$VERBOSE" in
  59         '')
  60                 output=$("$@" 2>&1 )
  61                 status=$?
  62                 test $status != 0 && printf "%s\n" "$output"
  63                 return $status
  64                 ;;
  65         *)
  66                 "$@"
  67                 ;;
  68         esac
  69 }
  70
  71 run_pre_rebase_hook () {
  72         if test -z "$OK_TO_SKIP_PRE_REBASE" &&
  73            test -x "$GIT_DIR/hooks/pre-rebase"
  74         then
  75                 "$GIT_DIR/hooks/pre-rebase" ${1+"$@"} || {
  76                         echo >&2 "The pre-rebase hook refused to rebase."
  77                         exit 1
  78                 }
  79         fi
  80 }
  81
  82 require_clean_work_tree () {
  83         # test if working tree is dirty
  84         git rev-parse --verify HEAD > /dev/null &&
  85         git update-index --ignore-submodules --refresh &&
  86         git diff-files --quiet --ignore-submodules &&
  87         git diff-index --cached --quiet HEAD --ignore-submodules -- ||
  88         die "Working tree is dirty"
  89 }
  90
  91 ORIG_REFLOG_ACTION="$GIT_REFLOG_ACTION"
  92
  93 comment_for_reflog () {
  94         case "$ORIG_REFLOG_ACTION" in
  95         ''|rebase*)
  96                 GIT_REFLOG_ACTION="rebase -i ($1)"
  97                 export GIT_REFLOG_ACTION
  98                 ;;
  99         esac
 100 }
 101
 102 last_count=
 103 mark_action_done () {
 104         sed -e 1q < "$TODO" >> "$DONE"
 105         sed -e 1d < "$TODO" >> "$TODO".new
 106         mv -f "$TODO".new "$TODO"
 107         count=$(grep -c '^[^#]' < "$DONE")
 108         total=$(($count+$(grep -c '^[^#]' < "$TODO")))
 109         if test "$last_count" != "$count"
 110         then
 111                 last_count=$count
 112                 printf "Rebasing (%d/%d)\r" $count $total
 113                 test -z "$VERBOSE" || echo
 114         fi
 115 }
 116
 117 make_patch () {
 118         sha1_and_parents="$(git rev-list --parents -1 "$1")"
 119         case "$sha1_and_parents" in
 120         ?*' '?*' '?*)
 121                 git diff --cc $sha1_and_parents
 122                 ;;
 123         ?*' '?*)
 124                 git diff-tree -p "$1^!"
 125                 ;;
 126         *)
 127                 echo "Root commit"
 128                 ;;
 129         esac > "$DOTEST"/patch
 130         test -f "$DOTEST"/message ||
 131                 git cat-file commit "$1" | sed "1,/^$/d" > "$DOTEST"/message
 132         test -f "$DOTEST"/author-script ||
 133                 get_author_ident_from_commit "$1" > "$DOTEST"/author-script
 134 }
 135
 136 die_with_patch () {
 137         make_patch "$1"
 138         git rerere
 139         die "$2"
 140 }
 141
 142 die_abort () {
 143         rm -rf "$DOTEST"
 144         die "$1"
 145 }
 146
 147 has_action () {
 148         grep '^[^#]' "$1" >/dev/null
 149 }
 150
 151 pick_one () {
 152         no_ff=
 153         case "$1" in -n) sha1=$2; no_ff=t ;; *) sha1=$1 ;; esac
 154         output git rev-parse --verify $sha1 || die "Invalid commit name: $sha1"
 155         test -d "$REWRITTEN" &&
 156                 pick_one_preserving_merges "$@" && return
 157         parent_sha1=$(git rev-parse --verify $sha1^) ||
 158                 die "Could not get the parent of $sha1"
 159         current_sha1=$(git rev-parse --verify HEAD)
 160         if test "$no_ff$current_sha1" = "$parent_sha1"; then
 161                 output git reset --hard $sha1
 162                 test "a$1" = a-n && output git reset --soft $current_sha1
 163                 sha1=$(git rev-parse --short $sha1)
 164                 output warn Fast forward to $sha1
 165         else
 166                 output git cherry-pick "$@"
 167         fi
 168 }
 169
 170 pick_one_preserving_merges () {
 171         fast_forward=t
 172         case "$1" in
 173         -n)
 174                 fast_forward=f
 175                 sha1=$2
 176                 ;;
 177         *)
 178                 sha1=$1
 179                 ;;
 180         esac
 181         sha1=$(git rev-parse $sha1)
 182
 183         if test -f "$DOTEST"/current-commit
 184         then
 185                 if test "$fast_forward" = t
 186                 then
 187                         cat "$DOTEST"/current-commit | while read current_commit
 188                         do
 189                                 git rev-parse HEAD > "$REWRITTEN"/$current_commit
 190                         done
 191                         rm "$DOTEST"/current-commit ||
 192                         die "Cannot write current commit's replacement sha1"
 193                 fi
 194         fi
 195
 196         echo $sha1 >> "$DOTEST"/current-commit
 197
 198         # rewrite parents; if none were rewritten, we can fast-forward.
 199         new_parents=
 200         pend=" $(git rev-list --parents -1 $sha1 | cut -d' ' -f2-)"
 201         while [ "$pend" != "" ]
 202         do
 203                 p=$(expr "$pend" : ' \([^ ]*\)')
 204                 pend="${pend# $p}"
 205
 206                 if test -f "$REWRITTEN"/$p
 207                 then
 208                         new_p=$(cat "$REWRITTEN"/$p)
 209
 210                         # If the todo reordered commits, and our parent is marked for
 211                         # rewriting, but hasn't been gotten to yet, assume the user meant to
 212                         # drop it on top of the current HEAD
 213                         if test -z "$new_p"
 214                         then
 215                                 new_p=$(git rev-parse HEAD)
 216                         fi
 217
 218                         test $p != $new_p && fast_forward=f
 219                         case "$new_parents" in
 220                         *$new_p*)
 221                                 ;; # do nothing; that parent is already there
 222                         *)
 223                                 new_parents="$new_parents $new_p"
 224                                 ;;
 225                         esac
 226                 else
 227                         if test -f "$DROPPED"/$p
 228                         then
 229                                 fast_forward=f
 230                                 pend=" $(cat "$DROPPED"/$p)$pend"
 231                         else
 232                                 new_parents="$new_parents $p"
 233                         fi
 234                 fi
 235         done
 236         case $fast_forward in
 237         t)
 238                 output warn "Fast forward to $sha1"
 239                 output git reset --hard $sha1 ||
 240                         die "Cannot fast forward to $sha1"
 241                 ;;
 242         f)
 243                 first_parent=$(expr "$new_parents" : ' \([^ ]*\)')
 244
 245                 if [ "$1" != "-n" ]
 246                 then
 247                         # detach HEAD to current parent
 248                         output git checkout $first_parent 2> /dev/null ||
 249                                 die "Cannot move HEAD to $first_parent"
 250                 fi
 251
 252                 case "$new_parents" in
 253                 ' '*' '*)
 254                         test "a$1" = a-n && die "Refusing to squash a merge: $sha1"
 255
 256                         # redo merge
 257                         author_script=$(get_author_ident_from_commit $sha1)
 258                         eval "$author_script"
 259                         msg="$(git cat-file commit $sha1 | sed -e '1,/^$/d')"
 260                         # No point in merging the first parent, that's HEAD
 261                         new_parents=${new_parents# $first_parent}
 262                         if ! GIT_AUTHOR_NAME="$GIT_AUTHOR_NAME" \
 263                                 GIT_AUTHOR_EMAIL="$GIT_AUTHOR_EMAIL" \
 264                                 GIT_AUTHOR_DATE="$GIT_AUTHOR_DATE" \
 265                                 output git merge $STRATEGY -m "$msg" \
 266                                         $new_parents
 267                         then
 268                                 printf "%s\n" "$msg" > "$GIT_DIR"/MERGE_MSG
 269                                 die_with_patch $sha1 "Error redoing merge $sha1"
 270                         fi
 271                         ;;
 272                 *)
 273                         output git cherry-pick "$@" ||
 274                                 die_with_patch $sha1 "Could not pick $sha1"
 275                         ;;
 276                 esac
 277                 ;;
 278         esac
 279 }
 280
 281 nth_string () {
 282         case "$1" in
 283         *1[0-9]|*[04-9]) echo "$1"th;;
 284         *1) echo "$1"st;;
 285         *2) echo "$1"nd;;
 286         *3) echo "$1"rd;;
 287         esac
 288 }
 289
 290 make_squash_message () {
 291         if test -f "$SQUASH_MSG"; then
 292                 COUNT=$(($(sed -n "s/^# This is [^0-9]*\([1-9][0-9]*\).*/\1/p" \
 293                         < "$SQUASH_MSG" | sed -ne '$p')+1))
 294                 echo "# This is a combination of $COUNT commits."
 295                 sed -e 1d -e '2,/^./{
 296                         /^$/d
 297                 }' <"$SQUASH_MSG"
 298         else
 299                 COUNT=2
 300                 echo "# This is a combination of two commits."
 301                 echo "# The first commit's message is:"
 302                 echo
 303                 git cat-file commit HEAD | sed -e '1,/^$/d'
 304         fi
 305         echo
 306         echo "# This is the $(nth_string $COUNT) commit message:"
 307         echo
 308         git cat-file commit $1 | sed -e '1,/^$/d'
 309 }
 310
 311 peek_next_command () {
 312         sed -n "1s/ .*$//p" < "$TODO"
 313 }
 314
 315 do_next () {
 316         rm -f "$DOTEST"/message "$DOTEST"/author-script \
 317                 "$DOTEST"/amend || exit
 318         read command sha1 rest < "$TODO"
 319         case "$command" in
 320         '#'*|''|noop)
 321                 mark_action_done
 322                 ;;
 323         pick|p)
 324                 comment_for_reflog pick
 325
 326                 mark_action_done
 327                 pick_one $sha1 ||
 328                         die_with_patch $sha1 "Could not apply $sha1... $rest"
 329                 ;;
 330         edit|e)
 331                 comment_for_reflog edit
 332
 333                 mark_action_done
 334                 pick_one $sha1 ||
 335                         die_with_patch $sha1 "Could not apply $sha1... $rest"
 336                 make_patch $sha1
 337                 git rev-parse --verify HEAD > "$DOTEST"/amend
 338                 warn "Stopped at $sha1... $rest"
 339                 warn "You can amend the commit now, with"
 340                 warn
 341                 warn "  git commit --amend"
 342                 warn
 343                 warn "Once you are satisfied with your changes, run"
 344                 warn
 345                 warn "  git rebase --continue"
 346                 warn
 347                 exit 0
 348                 ;;
 349         squash|s)
 350                 comment_for_reflog squash
 351
 352                 test -f "$DONE" && has_action "$DONE" ||
 353                         die "Cannot 'squash' without a previous commit"
 354
 355                 mark_action_done
 356                 make_squash_message $sha1 > "$MSG"
 357                 failed=f
 358                 author_script=$(get_author_ident_from_commit HEAD)
 359                 output git reset --soft HEAD^
 360                 pick_one -n $sha1 || failed=t
 361                 case "$(peek_next_command)" in
 362                 squash|s)
 363                         USE_OUTPUT=output
 364                         MSG_OPT=-F
 365                         EDIT_OR_FILE="$MSG"
 366                         cp "$MSG" "$SQUASH_MSG"
 367                         ;;
 368                 *)
 369                         USE_OUTPUT=
 370                         MSG_OPT=
 371                         EDIT_OR_FILE=-e
 372                         rm -f "$SQUASH_MSG" || exit
 373                         cp "$MSG" "$GIT_DIR"/SQUASH_MSG
 374                         rm -f "$GIT_DIR"/MERGE_MSG || exit
 375                         ;;
 376                 esac
 377                 echo "$author_script" > "$DOTEST"/author-script
 378                 if test $failed = f
 379                 then
 380                         # This is like --amend, but with a different message
 381                         eval "$author_script"
 382                         GIT_AUTHOR_NAME="$GIT_AUTHOR_NAME" \
 383                         GIT_AUTHOR_EMAIL="$GIT_AUTHOR_EMAIL" \
 384                         GIT_AUTHOR_DATE="$GIT_AUTHOR_DATE" \
 385                         $USE_OUTPUT git commit --no-verify \
 386                                 $MSG_OPT "$EDIT_OR_FILE" || failed=t
 387                 fi
 388                 if test $failed = t
 389                 then
 390                         cp "$MSG" "$GIT_DIR"/MERGE_MSG
 391                         warn
 392                         warn "Could not apply $sha1... $rest"
 393                         die_with_patch $sha1 ""
 394                 fi
 395                 ;;
 396         *)
 397                 warn "Unknown command: $command $sha1 $rest"
 398                 die_with_patch $sha1 "Please fix this in the file $TODO."
 399                 ;;
 400         esac
 401         test -s "$TODO" && return
 402
 403         comment_for_reflog finish &&
 404         HEADNAME=$(cat "$DOTEST"/head-name) &&
 405         OLDHEAD=$(cat "$DOTEST"/head) &&
 406         SHORTONTO=$(git rev-parse --short $(cat "$DOTEST"/onto)) &&
 407         NEWHEAD=$(git rev-parse HEAD) &&
 408         case $HEADNAME in
 409         refs/*)
 410                 message="$GIT_REFLOG_ACTION: $HEADNAME onto $SHORTONTO)" &&
 411                 git update-ref -m "$message" $HEADNAME $NEWHEAD $OLDHEAD &&
 412                 git symbolic-ref HEAD $HEADNAME
 413                 ;;
 414         esac && {
 415                 test ! -f "$DOTEST"/verbose ||
 416                         git diff-tree --stat $(cat "$DOTEST"/head)..HEAD
 417         } &&
 418         rm -rf "$DOTEST" &&
 419         git gc --auto &&
 420         warn "Successfully rebased and updated $HEADNAME."
 421
 422         exit
 423 }
 424
 425 do_rest () {
 426         while :
 427         do
 428                 do_next
 429         done
 430 }
 431
 432 # check if no other options are set
 433 is_standalone () {
 434         test $# -eq 2 -a "$2" = '--' &&
 435         test -z "$ONTO" &&
 436         test -z "$PRESERVE_MERGES" &&
 437         test -z "$STRATEGY" &&
 438         test -z "$VERBOSE"
 439 }
 440
 441 get_saved_options () {
 442         test -d "$REWRITTEN" && PRESERVE_MERGES=t
 443         test -f "$DOTEST"/strategy && STRATEGY="$(cat "$DOTEST"/strategy)"
 444         test -f "$DOTEST"/verbose && VERBOSE=t
 445 }
 446
 447 while test $# != 0
 448 do
 449         case "$1" in
 450         --no-verify)
 451                 OK_TO_SKIP_PRE_REBASE=yes
 452                 ;;
 453         --verify)
 454                 ;;
 455         --continue)
 456                 is_standalone "$@" || usage
 457                 get_saved_options
 458                 comment_for_reflog continue
 459
 460                 test -d "$DOTEST" || die "No interactive rebase running"
 461
 462                 # Sanity check
 463                 git rev-parse --verify HEAD >/dev/null ||
 464                         die "Cannot read HEAD"
 465                 git update-index --ignore-submodules --refresh &&
 466                         git diff-files --quiet --ignore-submodules ||
 467                         die "Working tree is dirty"
 468
 469                 # do we have anything to commit?
 470                 if git diff-index --cached --quiet --ignore-submodules HEAD --
 471                 then
 472                         : Nothing to commit -- skip this
 473                 else
 474                         . "$DOTEST"/author-script ||
 475                                 die "Cannot find the author identity"
 476                         amend=
 477                         if test -f "$DOTEST"/amend
 478                         then
 479                                 amend=$(git rev-parse --verify HEAD)
 480                                 test "$amend" = $(cat "$DOTEST"/amend) ||
 481                                 die "\
 482 You have uncommitted changes in your working tree. Please, commit them
 483 first and then run 'git rebase --continue' again."
 484                                 git reset --soft HEAD^ ||
 485                                 die "Cannot rewind the HEAD"
 486                         fi
 487                         export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_AUTHOR_DATE &&
 488                         git commit --no-verify -F "$DOTEST"/message -e || {
 489                                 test -n "$amend" && git reset --soft $amend
 490                                 die "Could not commit staged changes."
 491                         }
 492                 fi
 493
 494                 require_clean_work_tree
 495                 do_rest
 496                 ;;
 497         --abort)
 498                 is_standalone "$@" || usage
 499                 get_saved_options
 500                 comment_for_reflog abort
 501
 502                 git rerere clear
 503                 test -d "$DOTEST" || die "No interactive rebase running"
 504
 505                 HEADNAME=$(cat "$DOTEST"/head-name)
 506                 HEAD=$(cat "$DOTEST"/head)
 507                 case $HEADNAME in
 508                 refs/*)
 509                         git symbolic-ref HEAD $HEADNAME
 510                         ;;
 511                 esac &&
 512                 output git reset --hard $HEAD &&
 513                 rm -rf "$DOTEST"
 514                 exit
 515                 ;;
 516         --skip)
 517                 is_standalone "$@" || usage
 518                 get_saved_options
 519                 comment_for_reflog skip
 520
 521                 git rerere clear
 522                 test -d "$DOTEST" || die "No interactive rebase running"
 523
 524                 output git reset --hard && do_rest
 525                 ;;
 526         -s)
 527                 case "$#,$1" in
 528                 *,*=*)
 529                         STRATEGY="-s "$(expr "z$1" : 'z-[^=]*=\(.*\)') ;;
 530                 1,*)
 531                         usage ;;
 532                 *)
 533                         STRATEGY="-s $2"
 534                         shift ;;
 535                 esac
 536                 ;;
 537         -m)
 538                 # we use merge anyway
 539                 ;;
 540         -v)
 541                 VERBOSE=t
 542                 ;;
 543         -p)
 544                 PRESERVE_MERGES=t
 545                 ;;
 546         -i)
 547                 # yeah, we know
 548                 ;;
 549         --onto)
 550                 shift
 551                 ONTO=$(git rev-parse --verify "$1") ||
 552                         die "Does not point to a valid commit: $1"
 553                 ;;
 554         --)
 555                 shift
 556                 run_pre_rebase_hook ${1+"$@"}
 557                 test $# -eq 1 -o $# -eq 2 || usage
 558                 test -d "$DOTEST" &&
 559                         die "Interactive rebase already started"
 560
 561                 git var GIT_COMMITTER_IDENT >/dev/null ||
 562                         die "You need to set your committer info first"
 563
 564                 comment_for_reflog start
 565
 566                 require_clean_work_tree
 567
 568                 UPSTREAM=$(git rev-parse --verify "$1") || die "Invalid base"
 569                 test -z "$ONTO" && ONTO=$UPSTREAM
 570
 571                 if test ! -z "$2"
 572                 then
 573                         output git show-ref --verify --quiet "refs/heads/$2" ||
 574                                 die "Invalid branchname: $2"
 575                         output git checkout "$2" ||
 576                                 die "Could not checkout $2"
 577                 fi
 578
 579                 HEAD=$(git rev-parse --verify HEAD) || die "No HEAD?"
 580                 mkdir "$DOTEST" || die "Could not create temporary $DOTEST"
 581
 582                 : > "$DOTEST"/interactive || die "Could not mark as interactive"
 583                 git symbolic-ref HEAD > "$DOTEST"/head-name 2> /dev/null ||
 584                         echo "detached HEAD" > "$DOTEST"/head-name
 585
 586                 echo $HEAD > "$DOTEST"/head
 587                 echo $UPSTREAM > "$DOTEST"/upstream
 588                 echo $ONTO > "$DOTEST"/onto
 589                 test -z "$STRATEGY" || echo "$STRATEGY" > "$DOTEST"/strategy
 590                 test t = "$VERBOSE" && : > "$DOTEST"/verbose
 591                 if test t = "$PRESERVE_MERGES"
 592                 then
 593                         # $REWRITTEN contains files for each commit that is
 594                         # reachable by at least one merge base of $HEAD and
 595                         # $UPSTREAM. They are not necessarily rewritten, but
 596                         # their children might be.
 597                         # This ensures that commits on merged, but otherwise
 598                         # unrelated side branches are left alone. (Think "X"
 599                         # in the man page's example.)
 600                         mkdir "$REWRITTEN" &&
 601                         for c in $(git merge-base --all $HEAD $UPSTREAM)
 602                         do
 603                                 echo $ONTO > "$REWRITTEN"/$c ||
 604                                         die "Could not init rewritten commits"
 605                         done
 606                         # No cherry-pick because our first pass is to determine
 607                         # parents to rewrite and skipping dropped commits would
 608                         # prematurely end our probe
 609                         MERGES_OPTION=
 610                         first_after_upstream="$(git rev-list --reverse --first-parent $UPSTREAM..$HEAD | head -n 1)"
 611                 else
 612                         MERGES_OPTION="--no-merges --cherry-pick"
 613                 fi
 614
 615                 SHORTUPSTREAM=$(git rev-parse --short $UPSTREAM)
 616                 SHORTHEAD=$(git rev-parse --short $HEAD)
 617                 SHORTONTO=$(git rev-parse --short $ONTO)
 618                 git rev-list $MERGES_OPTION --pretty=oneline --abbrev-commit \
 619                         --abbrev=7 --reverse --left-right --topo-order \
 620                         $UPSTREAM...$HEAD | \
 621                         sed -n "s/^>//p" | while read shortsha1 rest
 622                 do
 623                         if test t != "$PRESERVE_MERGES"
 624                         then
 625                                 echo "pick $shortsha1 $rest" >> "$TODO"
 626                         else
 627                                 sha1=$(git rev-parse $shortsha1)
 628                                 preserve=t
 629                                 for p in $(git rev-list --parents -1 $sha1 | cut -d' ' -f2-)
 630                                 do
 631                                         if test -f "$REWRITTEN"/$p -a \( $p != $UPSTREAM -o $sha1 = $first_after_upstream \)
 632                                         then
 633                                                 preserve=f
 634                                         fi
 635                                 done
 636                                 if test f = "$preserve"
 637                                 then
 638                                         touch "$REWRITTEN"/$sha1
 639                                         echo "pick $shortsha1 $rest" >> "$TODO"
 640                                 fi
 641                         fi
 642                 done
 643
 644                 # Watch for commits that been dropped by --cherry-pick
 645                 if test t = "$PRESERVE_MERGES"
 646                 then
 647                         mkdir "$DROPPED"
 648                         # Save all non-cherry-picked changes
 649                         git rev-list $UPSTREAM...$HEAD --left-right --cherry-pick | \
 650                                 sed -n "s/^>//p" > "$DOTEST"/not-cherry-picks
 651                         # Now all commits and note which ones are missing in
 652                         # not-cherry-picks and hence being dropped
 653                         git rev-list $UPSTREAM..$HEAD |
 654                         while read rev
 655                         do
 656                                 if test -f "$REWRITTEN"/$rev -a "$(grep "$rev" "$DOTEST"/not-cherry-picks)" = ""
 657                                 then
 658                                         # Use -f2 because if rev-list is telling us this commit is
 659                                         # not worthwhile, we don't want to track its multiple heads,
 660                                         # just the history of its first-parent for others that will
 661                                         # be rebasing on top of it
 662                                         git rev-list --parents -1 $rev | cut -d' ' -f2 > "$DROPPED"/$rev
 663                                         short=$(git rev-list -1 --abbrev-commit --abbrev=7 $rev)
 664                                         grep -v "^[a-z][a-z]* $short" <"$TODO" > "${TODO}2" ; mv "${TODO}2" "$TODO"
 665                                         rm "$REWRITTEN"/$rev
 666                                 fi
 667                         done
 668                 fi
 669                 test -s "$TODO" || echo noop >> "$TODO"
 670                 cat >> "$TODO" << EOF
 671
 672 # Rebase $SHORTUPSTREAM..$SHORTHEAD onto $SHORTONTO
 673 #
 674 # Commands:
 675 #  p, pick = use commit
 676 #  e, edit = use commit, but stop for amending
 677 #  s, squash = use commit, but meld into previous commit
 678 #
 679 # If you remove a line here THAT COMMIT WILL BE LOST.
 680 # However, if you remove everything, the rebase will be aborted.
 681 #
 682 EOF
 683
 684                 has_action "$TODO" ||
 685                         die_abort "Nothing to do"
 686
 687                 cp "$TODO" "$TODO".backup
 688                 git_editor "$TODO" ||
 689                         die "Could not execute editor"
 690
 691                 has_action "$TODO" ||
 692                         die_abort "Nothing to do"
 693
 694                 git update-ref ORIG_HEAD $HEAD
 695                 output git checkout $ONTO && do_rest
 696                 ;;
 697         esac
 698         shift
 699 done