git-rebase--interactive.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2006 Johannes E. Schindelin
   4
   5 # SHORT DESCRIPTION
   6 #
   7 # This script makes it easy to fix up commits in the middle of a series,
   8 # and rearrange commits.
   9 #
  10 # The original idea comes from Eric W. Biederman, in
  11 # http://article.gmane.org/gmane.comp.version-control.git/22407
  12
  13 OPTIONS_KEEPDASHDASH=
  14 OPTIONS_SPEC="\
  15 git-rebase [-i] [options] [--] <upstream> [<branch>]
  16 git-rebase [-i] (--continue | --abort | --skip)
  17 --
  18  Available options are
  19 v,verbose          display a diffstat of what changed upstream
  20 onto=              rebase onto given branch instead of upstream
  21 p,preserve-merges  try to recreate merges instead of ignoring them
  22 s,strategy=        use the given merge strategy
  23 m,merge            always used (no-op)
  24 i,interactive      always used (no-op)
  25  Actions:
  26 continue           continue rebasing process
  27 abort              abort rebasing process and restore original branch
  28 skip               skip current patch and continue rebasing process
  29 no-verify          override pre-rebase hook from stopping the operation
  30 root               rebase all reachable commmits up to the root(s)
  31 autosquash         move commits that begin with squash!/fixup! under -i
  32 "
  33
  34 . git-sh-setup
  35 require_work_tree
  36
  37 DOTEST="$GIT_DIR/rebase-merge"
  38
  39 # The file containing rebase commands, comments, and empty lines.
  40 # This file is created by "git rebase -i" then edited by the user.  As
  41 # the lines are processed, they are removed from the front of this
  42 # file and written to the tail of $DONE.
  43 TODO="$DOTEST"/git-rebase-todo
  44
  45 # The rebase command lines that have already been processed.  A line
  46 # is moved here when it is first handled, before any associated user
  47 # actions.
  48 DONE="$DOTEST"/done
  49
  50 # The commit message that is planned to be used for any changes that
  51 # need to be committed following a user interaction.
  52 MSG="$DOTEST"/message
  53
  54 # The file into which is accumulated the suggested commit message for
  55 # squash/fixup commands.  When the first of a series of squash/fixups
  56 # is seen, the file is created and the commit message from the
  57 # previous commit and from the first squash/fixup commit are written
  58 # to it.  The commit message for each subsequent squash/fixup commit
  59 # is appended to the file as it is processed.
  60 #
  61 # The first line of the file is of the form
  62 #     # This is a combination of $COUNT commits.
  63 # where $COUNT is the number of commits whose messages have been
  64 # written to the file so far (including the initial "pick" commit).
  65 # Each time that a commit message is processed, this line is read and
  66 # updated.  It is deleted just before the combined commit is made.
  67 SQUASH_MSG="$DOTEST"/message-squash
  68
  69 # If the current series of squash/fixups has not yet included a squash
  70 # command, then this file exists and holds the commit message of the
  71 # original "pick" commit.  (If the series ends without a "squash"
  72 # command, then this can be used as the commit message of the combined
  73 # commit without opening the editor.)
  74 FIXUP_MSG="$DOTEST"/message-fixup
  75
  76 # $REWRITTEN is the name of a directory containing files for each
  77 # commit that is reachable by at least one merge base of $HEAD and
  78 # $UPSTREAM. They are not necessarily rewritten, but their children
  79 # might be.  This ensures that commits on merged, but otherwise
  80 # unrelated side branches are left alone. (Think "X" in the man page's
  81 # example.)
  82 REWRITTEN="$DOTEST"/rewritten
  83
  84 DROPPED="$DOTEST"/dropped
  85
  86 # A script to set the GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, and
  87 # GIT_AUTHOR_DATE that will be used for the commit that is currently
  88 # being rebased.
  89 AUTHOR_SCRIPT="$DOTEST"/author-script
  90
  91 # When an "edit" rebase command is being processed, the SHA1 of the
  92 # commit to be edited is recorded in this file.  When "git rebase
  93 # --continue" is executed, if there are any staged changes then they
  94 # will be amended to the HEAD commit, but only provided the HEAD
  95 # commit is still the commit to be edited.  When any other rebase
  96 # command is processed, this file is deleted.
  97 AMEND="$DOTEST"/amend
  98
  99 PRESERVE_MERGES=
 100 STRATEGY=
 101 ONTO=
 102 VERBOSE=
 103 OK_TO_SKIP_PRE_REBASE=
 104 REBASE_ROOT=
 105 AUTOSQUASH=
 106
 107 GIT_CHERRY_PICK_HELP="  After resolving the conflicts,
 108 mark the corrected paths with 'git add <paths>', and
 109 run 'git rebase --continue'"
 110 export GIT_CHERRY_PICK_HELP
 111
 112 warn () {
 113         echo "$*" >&2
 114 }
 115
 116 output () {
 117         case "$VERBOSE" in
 118         '')
 119                 output=$("$@" 2>&1 )
 120                 status=$?
 121                 test $status != 0 && printf "%s\n" "$output"
 122                 return $status
 123                 ;;
 124         *)
 125                 "$@"
 126                 ;;
 127         esac
 128 }
 129
 130 # Output the commit message for the specified commit.
 131 commit_message () {
 132         git cat-file commit "$1" | sed "1,/^$/d"
 133 }
 134
 135 run_pre_rebase_hook () {
 136         if test -z "$OK_TO_SKIP_PRE_REBASE" &&
 137            test -x "$GIT_DIR/hooks/pre-rebase"
 138         then
 139                 "$GIT_DIR/hooks/pre-rebase" ${1+"$@"} || {
 140                         echo >&2 "The pre-rebase hook refused to rebase."
 141                         exit 1
 142                 }
 143         fi
 144 }
 145
 146 require_clean_work_tree () {
 147         # test if working tree is dirty
 148         git rev-parse --verify HEAD > /dev/null &&
 149         git update-index --ignore-submodules --refresh &&
 150         git diff-files --quiet --ignore-submodules &&
 151         git diff-index --cached --quiet HEAD --ignore-submodules -- ||
 152         die "Working tree is dirty"
 153 }
 154
 155 ORIG_REFLOG_ACTION="$GIT_REFLOG_ACTION"
 156
 157 comment_for_reflog () {
 158         case "$ORIG_REFLOG_ACTION" in
 159         ''|rebase*)
 160                 GIT_REFLOG_ACTION="rebase -i ($1)"
 161                 export GIT_REFLOG_ACTION
 162                 ;;
 163         esac
 164 }
 165
 166 last_count=
 167 mark_action_done () {
 168         sed -e 1q < "$TODO" >> "$DONE"
 169         sed -e 1d < "$TODO" >> "$TODO".new
 170         mv -f "$TODO".new "$TODO"
 171         count=$(sane_grep -c '^[^#]' < "$DONE")
 172         total=$(($count+$(sane_grep -c '^[^#]' < "$TODO")))
 173         if test "$last_count" != "$count"
 174         then
 175                 last_count=$count
 176                 printf "Rebasing (%d/%d)\r" $count $total
 177                 test -z "$VERBOSE" || echo
 178         fi
 179 }
 180
 181 make_patch () {
 182         sha1_and_parents="$(git rev-list --parents -1 "$1")"
 183         case "$sha1_and_parents" in
 184         ?*' '?*' '?*)
 185                 git diff --cc $sha1_and_parents
 186                 ;;
 187         ?*' '?*)
 188                 git diff-tree -p "$1^!"
 189                 ;;
 190         *)
 191                 echo "Root commit"
 192                 ;;
 193         esac > "$DOTEST"/patch
 194         test -f "$MSG" ||
 195                 commit_message "$1" > "$MSG"
 196         test -f "$AUTHOR_SCRIPT" ||
 197                 get_author_ident_from_commit "$1" > "$AUTHOR_SCRIPT"
 198 }
 199
 200 die_with_patch () {
 201         make_patch "$1"
 202         git rerere
 203         die "$2"
 204 }
 205
 206 die_abort () {
 207         rm -rf "$DOTEST"
 208         die "$1"
 209 }
 210
 211 has_action () {
 212         sane_grep '^[^#]' "$1" >/dev/null
 213 }
 214
 215 # Run command with GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, and
 216 # GIT_AUTHOR_DATE exported from the current environment.
 217 do_with_author () {
 218         GIT_AUTHOR_NAME="$GIT_AUTHOR_NAME" \
 219         GIT_AUTHOR_EMAIL="$GIT_AUTHOR_EMAIL" \
 220         GIT_AUTHOR_DATE="$GIT_AUTHOR_DATE" \
 221         "$@"
 222 }
 223
 224 pick_one () {
 225         no_ff=
 226         case "$1" in -n) sha1=$2; no_ff=t ;; *) sha1=$1 ;; esac
 227         output git rev-parse --verify $sha1 || die "Invalid commit name: $sha1"
 228         test -d "$REWRITTEN" &&
 229                 pick_one_preserving_merges "$@" && return
 230         if test -n "$REBASE_ROOT"
 231         then
 232                 output git cherry-pick "$@"
 233                 return
 234         fi
 235         parent_sha1=$(git rev-parse --verify $sha1^) ||
 236                 die "Could not get the parent of $sha1"
 237         current_sha1=$(git rev-parse --verify HEAD)
 238         if test -z "$no_ff" -a "$current_sha1" = "$parent_sha1"
 239         then
 240                 output git reset --hard $sha1
 241                 output warn Fast-forward to $(git rev-parse --short $sha1)
 242         else
 243                 output git cherry-pick "$@"
 244         fi
 245 }
 246
 247 pick_one_preserving_merges () {
 248         fast_forward=t
 249         case "$1" in
 250         -n)
 251                 fast_forward=f
 252                 sha1=$2
 253                 ;;
 254         *)
 255                 sha1=$1
 256                 ;;
 257         esac
 258         sha1=$(git rev-parse $sha1)
 259
 260         if test -f "$DOTEST"/current-commit
 261         then
 262                 if test "$fast_forward" = t
 263                 then
 264                         cat "$DOTEST"/current-commit | while read current_commit
 265                         do
 266                                 git rev-parse HEAD > "$REWRITTEN"/$current_commit
 267                         done
 268                         rm "$DOTEST"/current-commit ||
 269                         die "Cannot write current commit's replacement sha1"
 270                 fi
 271         fi
 272
 273         echo $sha1 >> "$DOTEST"/current-commit
 274
 275         # rewrite parents; if none were rewritten, we can fast-forward.
 276         new_parents=
 277         pend=" $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)"
 278         if test "$pend" = " "
 279         then
 280                 pend=" root"
 281         fi
 282         while [ "$pend" != "" ]
 283         do
 284                 p=$(expr "$pend" : ' \([^ ]*\)')
 285                 pend="${pend# $p}"
 286
 287                 if test -f "$REWRITTEN"/$p
 288                 then
 289                         new_p=$(cat "$REWRITTEN"/$p)
 290
 291                         # If the todo reordered commits, and our parent is marked for
 292                         # rewriting, but hasn't been gotten to yet, assume the user meant to
 293                         # drop it on top of the current HEAD
 294                         if test -z "$new_p"
 295                         then
 296                                 new_p=$(git rev-parse HEAD)
 297                         fi
 298
 299                         test $p != $new_p && fast_forward=f
 300                         case "$new_parents" in
 301                         *$new_p*)
 302                                 ;; # do nothing; that parent is already there
 303                         *)
 304                                 new_parents="$new_parents $new_p"
 305                                 ;;
 306                         esac
 307                 else
 308                         if test -f "$DROPPED"/$p
 309                         then
 310                                 fast_forward=f
 311                                 replacement="$(cat "$DROPPED"/$p)"
 312                                 test -z "$replacement" && replacement=root
 313                                 pend=" $replacement$pend"
 314                         else
 315                                 new_parents="$new_parents $p"
 316                         fi
 317                 fi
 318         done
 319         case $fast_forward in
 320         t)
 321                 output warn "Fast-forward to $sha1"
 322                 output git reset --hard $sha1 ||
 323                         die "Cannot fast-forward to $sha1"
 324                 ;;
 325         f)
 326                 first_parent=$(expr "$new_parents" : ' \([^ ]*\)')
 327
 328                 if [ "$1" != "-n" ]
 329                 then
 330                         # detach HEAD to current parent
 331                         output git checkout $first_parent 2> /dev/null ||
 332                                 die "Cannot move HEAD to $first_parent"
 333                 fi
 334
 335                 case "$new_parents" in
 336                 ' '*' '*)
 337                         test "a$1" = a-n && die "Refusing to squash a merge: $sha1"
 338
 339                         # redo merge
 340                         author_script=$(get_author_ident_from_commit $sha1)
 341                         eval "$author_script"
 342                         msg="$(commit_message $sha1)"
 343                         # No point in merging the first parent, that's HEAD
 344                         new_parents=${new_parents# $first_parent}
 345                         if ! do_with_author output \
 346                                 git merge $STRATEGY -m "$msg" $new_parents
 347                         then
 348                                 printf "%s\n" "$msg" > "$GIT_DIR"/MERGE_MSG
 349                                 die_with_patch $sha1 "Error redoing merge $sha1"
 350                         fi
 351                         ;;
 352                 *)
 353                         output git cherry-pick "$@" ||
 354                                 die_with_patch $sha1 "Could not pick $sha1"
 355                         ;;
 356                 esac
 357                 ;;
 358         esac
 359 }
 360
 361 nth_string () {
 362         case "$1" in
 363         *1[0-9]|*[04-9]) echo "$1"th;;
 364         *1) echo "$1"st;;
 365         *2) echo "$1"nd;;
 366         *3) echo "$1"rd;;
 367         esac
 368 }
 369
 370 update_squash_messages () {
 371         if test -f "$SQUASH_MSG"; then
 372                 mv "$SQUASH_MSG" "$SQUASH_MSG".bak || exit
 373                 COUNT=$(($(sed -n \
 374                         -e "1s/^# This is a combination of \(.*\) commits\./\1/p" \
 375                         -e "q" < "$SQUASH_MSG".bak)+1))
 376                 {
 377                         echo "# This is a combination of $COUNT commits."
 378                         sed -e 1d -e '2,/^./{
 379                                 /^$/d
 380                         }' <"$SQUASH_MSG".bak
 381                 } >$SQUASH_MSG
 382         else
 383                 commit_message HEAD > "$FIXUP_MSG" || die "Cannot write $FIXUP_MSG"
 384                 COUNT=2
 385                 {
 386                         echo "# This is a combination of 2 commits."
 387                         echo "# The first commit's message is:"
 388                         echo
 389                         cat "$FIXUP_MSG"
 390                 } >$SQUASH_MSG
 391         fi
 392         case $1 in
 393         squash)
 394                 rm -f "$FIXUP_MSG"
 395                 echo
 396                 echo "# This is the $(nth_string $COUNT) commit message:"
 397                 echo
 398                 commit_message $2
 399                 ;;
 400         fixup)
 401                 echo
 402                 echo "# The $(nth_string $COUNT) commit message will be skipped:"
 403                 echo
 404                 commit_message $2 | sed -e 's/^/#       /'
 405                 ;;
 406         esac >>$SQUASH_MSG
 407 }
 408
 409 peek_next_command () {
 410         sed -n -e "/^#/d" -e "/^$/d" -e "s/ .*//p" -e "q" < "$TODO"
 411 }
 412
 413 # A squash/fixup has failed.  Prepare the long version of the squash
 414 # commit message, then die_with_patch.  This code path requires the
 415 # user to edit the combined commit message for all commits that have
 416 # been squashed/fixedup so far.  So also erase the old squash
 417 # messages, effectively causing the combined commit to be used as the
 418 # new basis for any further squash/fixups.  Args: sha1 rest
 419 die_failed_squash() {
 420         mv "$SQUASH_MSG" "$MSG" || exit
 421         rm -f "$FIXUP_MSG"
 422         cp "$MSG" "$GIT_DIR"/MERGE_MSG || exit
 423         warn
 424         warn "Could not apply $1... $2"
 425         die_with_patch $1 ""
 426 }
 427
 428 do_next () {
 429         rm -f "$MSG" "$AUTHOR_SCRIPT" "$AMEND" || exit
 430         read command sha1 rest < "$TODO"
 431         case "$command" in
 432         '#'*|''|noop)
 433                 mark_action_done
 434                 ;;
 435         pick|p)
 436                 comment_for_reflog pick
 437
 438                 mark_action_done
 439                 pick_one $sha1 ||
 440                         die_with_patch $sha1 "Could not apply $sha1... $rest"
 441                 ;;
 442         reword|r)
 443                 comment_for_reflog reword
 444
 445                 mark_action_done
 446                 pick_one $sha1 ||
 447                         die_with_patch $sha1 "Could not apply $sha1... $rest"
 448                 git commit --amend
 449                 ;;
 450         edit|e)
 451                 comment_for_reflog edit
 452
 453                 mark_action_done
 454                 pick_one $sha1 ||
 455                         die_with_patch $sha1 "Could not apply $sha1... $rest"
 456                 make_patch $sha1
 457                 git rev-parse --verify HEAD > "$AMEND"
 458                 warn "Stopped at $sha1... $rest"
 459                 warn "You can amend the commit now, with"
 460                 warn
 461                 warn "  git commit --amend"
 462                 warn
 463                 warn "Once you are satisfied with your changes, run"
 464                 warn
 465                 warn "  git rebase --continue"
 466                 warn
 467                 exit 0
 468                 ;;
 469         squash|s|fixup|f)
 470                 case "$command" in
 471                 squash|s)
 472                         squash_style=squash
 473                         ;;
 474                 fixup|f)
 475                         squash_style=fixup
 476                         ;;
 477                 esac
 478                 comment_for_reflog $squash_style
 479
 480                 test -f "$DONE" && has_action "$DONE" ||
 481                         die "Cannot '$squash_style' without a previous commit"
 482
 483                 mark_action_done
 484                 update_squash_messages $squash_style $sha1
 485                 author_script=$(get_author_ident_from_commit HEAD)
 486                 echo "$author_script" > "$AUTHOR_SCRIPT"
 487                 eval "$author_script"
 488                 output git reset --soft HEAD^
 489                 pick_one -n $sha1 || die_failed_squash $sha1 "$rest"
 490                 case "$(peek_next_command)" in
 491                 squash|s|fixup|f)
 492                         # This is an intermediate commit; its message will only be
 493                         # used in case of trouble.  So use the long version:
 494                         do_with_author output git commit --no-verify -F "$SQUASH_MSG" ||
 495                                 die_failed_squash $sha1 "$rest"
 496                         ;;
 497                 *)
 498                         # This is the final command of this squash/fixup group
 499                         if test -f "$FIXUP_MSG"
 500                         then
 501                                 do_with_author git commit --no-verify -F "$FIXUP_MSG" ||
 502                                         die_failed_squash $sha1 "$rest"
 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                                         die_failed_squash $sha1 "$rest"
 508                         fi
 509                         rm -f "$SQUASH_MSG" "$FIXUP_MSG"
 510                         ;;
 511                 esac
 512                 ;;
 513         *)
 514                 warn "Unknown command: $command $sha1 $rest"
 515                 if git rev-parse --verify -q "$sha1" >/dev/null
 516                 then
 517                         die_with_patch $sha1 "Please fix this in the file $TODO."
 518                 else
 519                         die "Please fix this in the file $TODO."
 520                 fi
 521                 ;;
 522         esac
 523         test -s "$TODO" && return
 524
 525         comment_for_reflog finish &&
 526         HEADNAME=$(cat "$DOTEST"/head-name) &&
 527         OLDHEAD=$(cat "$DOTEST"/head) &&
 528         SHORTONTO=$(git rev-parse --short $(cat "$DOTEST"/onto)) &&
 529         NEWHEAD=$(git rev-parse HEAD) &&
 530         case $HEADNAME in
 531         refs/*)
 532                 message="$GIT_REFLOG_ACTION: $HEADNAME onto $SHORTONTO" &&
 533                 git update-ref -m "$message" $HEADNAME $NEWHEAD $OLDHEAD &&
 534                 git symbolic-ref HEAD $HEADNAME
 535                 ;;
 536         esac && {
 537                 test ! -f "$DOTEST"/verbose ||
 538                         git diff-tree --stat $(cat "$DOTEST"/head)..HEAD
 539         } &&
 540         rm -rf "$DOTEST" &&
 541         git gc --auto &&
 542         warn "Successfully rebased and updated $HEADNAME."
 543
 544         exit
 545 }
 546
 547 do_rest () {
 548         while :
 549         do
 550                 do_next
 551         done
 552 }
 553
 554 # skip picking commits whose parents are unchanged
 555 skip_unnecessary_picks () {
 556         fd=3
 557         while read command sha1 rest
 558         do
 559                 # fd=3 means we skip the command
 560                 case "$fd,$command,$(git rev-parse --verify --quiet $sha1^)" in
 561                 3,pick,"$ONTO"*|3,p,"$ONTO"*)
 562                         # pick a commit whose parent is current $ONTO -> skip
 563                         ONTO=$sha1
 564                         ;;
 565                 3,#*|3,,*)
 566                         # copy comments
 567                         ;;
 568                 *)
 569                         fd=1
 570                         ;;
 571                 esac
 572                 echo "$command${sha1:+ }$sha1${rest:+ }$rest" >&$fd
 573         done <"$TODO" >"$TODO.new" 3>>"$DONE" &&
 574         mv -f "$TODO".new "$TODO" ||
 575         die "Could not skip unnecessary pick commands"
 576 }
 577
 578 # check if no other options are set
 579 is_standalone () {
 580         test $# -eq 2 -a "$2" = '--' &&
 581         test -z "$ONTO" &&
 582         test -z "$PRESERVE_MERGES" &&
 583         test -z "$STRATEGY" &&
 584         test -z "$VERBOSE"
 585 }
 586
 587 get_saved_options () {
 588         test -d "$REWRITTEN" && PRESERVE_MERGES=t
 589         test -f "$DOTEST"/strategy && STRATEGY="$(cat "$DOTEST"/strategy)"
 590         test -f "$DOTEST"/verbose && VERBOSE=t
 591         test -f "$DOTEST"/rebase-root && REBASE_ROOT=t
 592 }
 593
 594 # Rearrange the todo list that has both "pick sha1 msg" and
 595 # "pick sha1 fixup!/squash! msg" appears in it so that the latter
 596 # comes immediately after the former, and change "pick" to
 597 # "fixup"/"squash".
 598 rearrange_squash () {
 599         sed -n -e 's/^pick \([0-9a-f]*\) \(squash\)! /\1 \2 /p' \
 600                 -e 's/^pick \([0-9a-f]*\) \(fixup\)! /\1 \2 /p' \
 601                 "$1" >"$1.sq"
 602         test -s "$1.sq" || return
 603
 604         used=
 605         while read pick sha1 message
 606         do
 607                 case " $used" in
 608                 *" $sha1 "*) continue ;;
 609                 esac
 610                 echo "$pick $sha1 $message"
 611                 while read squash action msg
 612                 do
 613                         case "$message" in
 614                         "$msg"*)
 615                                 echo "$action $squash $action! $msg"
 616                                 used="$used$squash "
 617                                 ;;
 618                         esac
 619                 done <"$1.sq"
 620         done >"$1.rearranged" <"$1"
 621         cat "$1.rearranged" >"$1"
 622         rm -f "$1.sq" "$1.rearranged"
 623 }
 624
 625 LF='
 626 '
 627 parse_onto () {
 628         case "$1" in
 629         *...*)
 630                 if      left=${1%...*} right=${1#*...} &&
 631                         onto=$(git merge-base --all ${left:-HEAD} ${right:-HEAD})
 632                 then
 633                         case "$onto" in
 634                         ?*"$LF"?* | '')
 635                                 exit 1 ;;
 636                         esac
 637                         echo "$onto"
 638                         exit 0
 639                 fi
 640         esac
 641         git rev-parse --verify "$1^0"
 642 }
 643
 644 while test $# != 0
 645 do
 646         case "$1" in
 647         --no-verify)
 648                 OK_TO_SKIP_PRE_REBASE=yes
 649                 ;;
 650         --verify)
 651                 ;;
 652         --continue)
 653                 is_standalone "$@" || usage
 654                 get_saved_options
 655                 comment_for_reflog continue
 656
 657                 test -d "$DOTEST" || die "No interactive rebase running"
 658
 659                 # Sanity check
 660                 git rev-parse --verify HEAD >/dev/null ||
 661                         die "Cannot read HEAD"
 662                 git update-index --ignore-submodules --refresh &&
 663                         git diff-files --quiet --ignore-submodules ||
 664                         die "Working tree is dirty"
 665
 666                 # do we have anything to commit?
 667                 if git diff-index --cached --quiet --ignore-submodules HEAD --
 668                 then
 669                         : Nothing to commit -- skip this
 670                 else
 671                         . "$AUTHOR_SCRIPT" ||
 672                                 die "Cannot find the author identity"
 673                         amend=
 674                         if test -f "$AMEND"
 675                         then
 676                                 amend=$(git rev-parse --verify HEAD)
 677                                 test "$amend" = $(cat "$AMEND") ||
 678                                 die "\
 679 You have uncommitted changes in your working tree. Please, commit them
 680 first and then run 'git rebase --continue' again."
 681                                 git reset --soft HEAD^ ||
 682                                 die "Cannot rewind the HEAD"
 683                         fi
 684                         do_with_author git commit --no-verify -F "$MSG" -e || {
 685                                 test -n "$amend" && git reset --soft $amend
 686                                 die "Could not commit staged changes."
 687                         }
 688                 fi
 689
 690                 require_clean_work_tree
 691                 do_rest
 692                 ;;
 693         --abort)
 694                 is_standalone "$@" || usage
 695                 get_saved_options
 696                 comment_for_reflog abort
 697
 698                 git rerere clear
 699                 test -d "$DOTEST" || die "No interactive rebase running"
 700
 701                 HEADNAME=$(cat "$DOTEST"/head-name)
 702                 HEAD=$(cat "$DOTEST"/head)
 703                 case $HEADNAME in
 704                 refs/*)
 705                         git symbolic-ref HEAD $HEADNAME
 706                         ;;
 707                 esac &&
 708                 output git reset --hard $HEAD &&
 709                 rm -rf "$DOTEST"
 710                 exit
 711                 ;;
 712         --skip)
 713                 is_standalone "$@" || usage
 714                 get_saved_options
 715                 comment_for_reflog skip
 716
 717                 git rerere clear
 718                 test -d "$DOTEST" || die "No interactive rebase running"
 719
 720                 output git reset --hard && do_rest
 721                 ;;
 722         -s)
 723                 case "$#,$1" in
 724                 *,*=*)
 725                         STRATEGY="-s "$(expr "z$1" : 'z-[^=]*=\(.*\)') ;;
 726                 1,*)
 727                         usage ;;
 728                 *)
 729                         STRATEGY="-s $2"
 730                         shift ;;
 731                 esac
 732                 ;;
 733         -m)
 734                 # we use merge anyway
 735                 ;;
 736         -v)
 737                 VERBOSE=t
 738                 ;;
 739         -p)
 740                 PRESERVE_MERGES=t
 741                 ;;
 742         -i)
 743                 # yeah, we know
 744                 ;;
 745         --root)
 746                 REBASE_ROOT=t
 747                 ;;
 748         --autosquash)
 749                 AUTOSQUASH=t
 750                 ;;
 751         --onto)
 752                 shift
 753                 ONTO=$(parse_onto "$1") ||
 754                         die "Does not point to a valid commit: $1"
 755                 ;;
 756         --)
 757                 shift
 758                 test -z "$REBASE_ROOT" -a $# -ge 1 -a $# -le 2 ||
 759                 test ! -z "$REBASE_ROOT" -a $# -le 1 || usage
 760                 test -d "$DOTEST" &&
 761                         die "Interactive rebase already started"
 762
 763                 git var GIT_COMMITTER_IDENT >/dev/null ||
 764                         die "You need to set your committer info first"
 765
 766                 if test -z "$REBASE_ROOT"
 767                 then
 768                         UPSTREAM_ARG="$1"
 769                         UPSTREAM=$(git rev-parse --verify "$1") || die "Invalid base"
 770                         test -z "$ONTO" && ONTO=$UPSTREAM
 771                         shift
 772                 else
 773                         UPSTREAM=
 774                         UPSTREAM_ARG=--root
 775                         test -z "$ONTO" &&
 776                                 die "You must specify --onto when using --root"
 777                 fi
 778                 run_pre_rebase_hook "$UPSTREAM_ARG" "$@"
 779
 780                 comment_for_reflog start
 781
 782                 require_clean_work_tree
 783
 784                 if test ! -z "$1"
 785                 then
 786                         output git show-ref --verify --quiet "refs/heads/$1" ||
 787                                 die "Invalid branchname: $1"
 788                         output git checkout "$1" ||
 789                                 die "Could not checkout $1"
 790                 fi
 791
 792                 HEAD=$(git rev-parse --verify HEAD) || die "No HEAD?"
 793                 mkdir "$DOTEST" || die "Could not create temporary $DOTEST"
 794
 795                 : > "$DOTEST"/interactive || die "Could not mark as interactive"
 796                 git symbolic-ref HEAD > "$DOTEST"/head-name 2> /dev/null ||
 797                         echo "detached HEAD" > "$DOTEST"/head-name
 798
 799                 echo $HEAD > "$DOTEST"/head
 800                 case "$REBASE_ROOT" in
 801                 '')
 802                         rm -f "$DOTEST"/rebase-root ;;
 803                 *)
 804                         : >"$DOTEST"/rebase-root ;;
 805                 esac
 806                 echo $ONTO > "$DOTEST"/onto
 807                 test -z "$STRATEGY" || echo "$STRATEGY" > "$DOTEST"/strategy
 808                 test t = "$VERBOSE" && : > "$DOTEST"/verbose
 809                 if test t = "$PRESERVE_MERGES"
 810                 then
 811                         if test -z "$REBASE_ROOT"
 812                         then
 813                                 mkdir "$REWRITTEN" &&
 814                                 for c in $(git merge-base --all $HEAD $UPSTREAM)
 815                                 do
 816                                         echo $ONTO > "$REWRITTEN"/$c ||
 817                                                 die "Could not init rewritten commits"
 818                                 done
 819                         else
 820                                 mkdir "$REWRITTEN" &&
 821                                 echo $ONTO > "$REWRITTEN"/root ||
 822                                         die "Could not init rewritten commits"
 823                         fi
 824                         # No cherry-pick because our first pass is to determine
 825                         # parents to rewrite and skipping dropped commits would
 826                         # prematurely end our probe
 827                         MERGES_OPTION=
 828                         first_after_upstream="$(git rev-list --reverse --first-parent $UPSTREAM..$HEAD | head -n 1)"
 829                 else
 830                         MERGES_OPTION="--no-merges --cherry-pick"
 831                 fi
 832
 833                 SHORTHEAD=$(git rev-parse --short $HEAD)
 834                 SHORTONTO=$(git rev-parse --short $ONTO)
 835                 if test -z "$REBASE_ROOT"
 836                         # this is now equivalent to ! -z "$UPSTREAM"
 837                 then
 838                         SHORTUPSTREAM=$(git rev-parse --short $UPSTREAM)
 839                         REVISIONS=$UPSTREAM...$HEAD
 840                         SHORTREVISIONS=$SHORTUPSTREAM..$SHORTHEAD
 841                 else
 842                         REVISIONS=$ONTO...$HEAD
 843                         SHORTREVISIONS=$SHORTHEAD
 844                 fi
 845                 git rev-list $MERGES_OPTION --pretty=oneline --abbrev-commit \
 846                         --abbrev=7 --reverse --left-right --topo-order \
 847                         $REVISIONS | \
 848                         sed -n "s/^>//p" | while read shortsha1 rest
 849                 do
 850                         if test t != "$PRESERVE_MERGES"
 851                         then
 852                                 echo "pick $shortsha1 $rest" >> "$TODO"
 853                         else
 854                                 sha1=$(git rev-parse $shortsha1)
 855                                 if test -z "$REBASE_ROOT"
 856                                 then
 857                                         preserve=t
 858                                         for p in $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)
 859                                         do
 860                                                 if test -f "$REWRITTEN"/$p -a \( $p != $ONTO -o $sha1 = $first_after_upstream \)
 861                                                 then
 862                                                         preserve=f
 863                                                 fi
 864                                         done
 865                                 else
 866                                         preserve=f
 867                                 fi
 868                                 if test f = "$preserve"
 869                                 then
 870                                         touch "$REWRITTEN"/$sha1
 871                                         echo "pick $shortsha1 $rest" >> "$TODO"
 872                                 fi
 873                         fi
 874                 done
 875
 876                 # Watch for commits that been dropped by --cherry-pick
 877                 if test t = "$PRESERVE_MERGES"
 878                 then
 879                         mkdir "$DROPPED"
 880                         # Save all non-cherry-picked changes
 881                         git rev-list $REVISIONS --left-right --cherry-pick | \
 882                                 sed -n "s/^>//p" > "$DOTEST"/not-cherry-picks
 883                         # Now all commits and note which ones are missing in
 884                         # not-cherry-picks and hence being dropped
 885                         git rev-list $REVISIONS |
 886                         while read rev
 887                         do
 888                                 if test -f "$REWRITTEN"/$rev -a "$(sane_grep "$rev" "$DOTEST"/not-cherry-picks)" = ""
 889                                 then
 890                                         # Use -f2 because if rev-list is telling us this commit is
 891                                         # not worthwhile, we don't want to track its multiple heads,
 892                                         # just the history of its first-parent for others that will
 893                                         # be rebasing on top of it
 894                                         git rev-list --parents -1 $rev | cut -d' ' -s -f2 > "$DROPPED"/$rev
 895                                         short=$(git rev-list -1 --abbrev-commit --abbrev=7 $rev)
 896                                         sane_grep -v "^[a-z][a-z]* $short" <"$TODO" > "${TODO}2" ; mv "${TODO}2" "$TODO"
 897                                         rm "$REWRITTEN"/$rev
 898                                 fi
 899                         done
 900                 fi
 901
 902                 test -s "$TODO" || echo noop >> "$TODO"
 903                 test -n "$AUTOSQUASH" && rearrange_squash "$TODO"
 904                 cat >> "$TODO" << EOF
 905
 906 # Rebase $SHORTREVISIONS onto $SHORTONTO
 907 #
 908 # Commands:
 909 #  p, pick = use commit
 910 #  r, reword = use commit, but edit the commit message
 911 #  e, edit = use commit, but stop for amending
 912 #  s, squash = use commit, but meld into previous commit
 913 #  f, fixup = like "squash", but discard this commit's log message
 914 #
 915 # If you remove a line here THAT COMMIT WILL BE LOST.
 916 # However, if you remove everything, the rebase will be aborted.
 917 #
 918 EOF
 919
 920                 has_action "$TODO" ||
 921                         die_abort "Nothing to do"
 922
 923                 cp "$TODO" "$TODO".backup
 924                 git_editor "$TODO" ||
 925                         die_abort "Could not execute editor"
 926
 927                 has_action "$TODO" ||
 928                         die_abort "Nothing to do"
 929
 930                 test -d "$REWRITTEN" || skip_unnecessary_picks
 931
 932                 git update-ref ORIG_HEAD $HEAD
 933                 output git checkout $ONTO && do_rest
 934                 ;;
 935         esac
 936         shift
 937 done