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 no-ff              cherry-pick all commits, even if unchanged
  24 m,merge            always used (no-op)
  25 i,interactive      always used (no-op)
  26  Actions:
  27 continue           continue rebasing process
  28 abort              abort rebasing process and restore original branch
  29 skip               skip current patch and continue rebasing process
  30 no-verify          override pre-rebase hook from stopping the operation
  31 verify             allow pre-rebase hook to run
  32 root               rebase all reachable commmits up to the root(s)
  33 autosquash         move commits that begin with squash!/fixup! under -i
  34 "
  35
  36 . git-sh-setup
  37 require_work_tree
  38
  39 DOTEST="$GIT_DIR/rebase-merge"
  40
  41 # The file containing rebase commands, comments, and empty lines.
  42 # This file is created by "git rebase -i" then edited by the user.  As
  43 # the lines are processed, they are removed from the front of this
  44 # file and written to the tail of $DONE.
  45 TODO="$DOTEST"/git-rebase-todo
  46
  47 # The rebase command lines that have already been processed.  A line
  48 # is moved here when it is first handled, before any associated user
  49 # actions.
  50 DONE="$DOTEST"/done
  51
  52 # The commit message that is planned to be used for any changes that
  53 # need to be committed following a user interaction.
  54 MSG="$DOTEST"/message
  55
  56 # The file into which is accumulated the suggested commit message for
  57 # squash/fixup commands.  When the first of a series of squash/fixups
  58 # is seen, the file is created and the commit message from the
  59 # previous commit and from the first squash/fixup commit are written
  60 # to it.  The commit message for each subsequent squash/fixup commit
  61 # is appended to the file as it is processed.
  62 #
  63 # The first line of the file is of the form
  64 #     # This is a combination of $COUNT commits.
  65 # where $COUNT is the number of commits whose messages have been
  66 # written to the file so far (including the initial "pick" commit).
  67 # Each time that a commit message is processed, this line is read and
  68 # updated.  It is deleted just before the combined commit is made.
  69 SQUASH_MSG="$DOTEST"/message-squash
  70
  71 # If the current series of squash/fixups has not yet included a squash
  72 # command, then this file exists and holds the commit message of the
  73 # original "pick" commit.  (If the series ends without a "squash"
  74 # command, then this can be used as the commit message of the combined
  75 # commit without opening the editor.)
  76 FIXUP_MSG="$DOTEST"/message-fixup
  77
  78 # $REWRITTEN is the name of a directory containing files for each
  79 # commit that is reachable by at least one merge base of $HEAD and
  80 # $UPSTREAM. They are not necessarily rewritten, but their children
  81 # might be.  This ensures that commits on merged, but otherwise
  82 # unrelated side branches are left alone. (Think "X" in the man page's
  83 # example.)
  84 REWRITTEN="$DOTEST"/rewritten
  85
  86 DROPPED="$DOTEST"/dropped
  87
  88 # A script to set the GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, and
  89 # GIT_AUTHOR_DATE that will be used for the commit that is currently
  90 # being rebased.
  91 AUTHOR_SCRIPT="$DOTEST"/author-script
  92
  93 # When an "edit" rebase command is being processed, the SHA1 of the
  94 # commit to be edited is recorded in this file.  When "git rebase
  95 # --continue" is executed, if there are any staged changes then they
  96 # will be amended to the HEAD commit, but only provided the HEAD
  97 # commit is still the commit to be edited.  When any other rebase
  98 # command is processed, this file is deleted.
  99 AMEND="$DOTEST"/amend
 100
 101 # For the post-rewrite hook, we make a list of rewritten commits and
 102 # their new sha1s.  The rewritten-pending list keeps the sha1s of
 103 # commits that have been processed, but not committed yet,
 104 # e.g. because they are waiting for a 'squash' command.
 105 REWRITTEN_LIST="$DOTEST"/rewritten-list
 106 REWRITTEN_PENDING="$DOTEST"/rewritten-pending
 107
 108 PRESERVE_MERGES=
 109 STRATEGY=
 110 ONTO=
 111 VERBOSE=
 112 OK_TO_SKIP_PRE_REBASE=
 113 REBASE_ROOT=
 114 AUTOSQUASH=
 115 test "$(git config --bool rebase.autosquash)" = "true" && AUTOSQUASH=t
 116 NEVER_FF=
 117
 118 GIT_CHERRY_PICK_HELP="\
 119 hint: after resolving the conflicts, mark the corrected paths
 120 hint: with 'git add <paths>' and run 'git rebase --continue'"
 121 export GIT_CHERRY_PICK_HELP
 122
 123 warn () {
 124         printf '%s\n' "$*" >&2
 125 }
 126
 127 output () {
 128         case "$VERBOSE" in
 129         '')
 130                 output=$("$@" 2>&1 )
 131                 status=$?
 132                 test $status != 0 && printf "%s\n" "$output"
 133                 return $status
 134                 ;;
 135         *)
 136                 "$@"
 137                 ;;
 138         esac
 139 }
 140
 141 # Output the commit message for the specified commit.
 142 commit_message () {
 143         git cat-file commit "$1" | sed "1,/^$/d"
 144 }
 145
 146 run_pre_rebase_hook () {
 147         if test -z "$OK_TO_SKIP_PRE_REBASE" &&
 148            test -x "$GIT_DIR/hooks/pre-rebase"
 149         then
 150                 "$GIT_DIR/hooks/pre-rebase" ${1+"$@"} || {
 151                         echo >&2 "The pre-rebase hook refused to rebase."
 152                         exit 1
 153                 }
 154         fi
 155 }
 156
 157
 158 ORIG_REFLOG_ACTION="$GIT_REFLOG_ACTION"
 159
 160 comment_for_reflog () {
 161         case "$ORIG_REFLOG_ACTION" in
 162         ''|rebase*)
 163                 GIT_REFLOG_ACTION="rebase -i ($1)"
 164                 export GIT_REFLOG_ACTION
 165                 ;;
 166         esac
 167 }
 168
 169 last_count=
 170 mark_action_done () {
 171         sed -e 1q < "$TODO" >> "$DONE"
 172         sed -e 1d < "$TODO" >> "$TODO".new
 173         mv -f "$TODO".new "$TODO"
 174         count=$(sane_grep -c '^[^#]' < "$DONE")
 175         total=$(($count+$(sane_grep -c '^[^#]' < "$TODO")))
 176         if test "$last_count" != "$count"
 177         then
 178                 last_count=$count
 179                 printf "Rebasing (%d/%d)\r" $count $total
 180                 test -z "$VERBOSE" || echo
 181         fi
 182 }
 183
 184 make_patch () {
 185         sha1_and_parents="$(git rev-list --parents -1 "$1")"
 186         case "$sha1_and_parents" in
 187         ?*' '?*' '?*)
 188                 git diff --cc $sha1_and_parents
 189                 ;;
 190         ?*' '?*)
 191                 git diff-tree -p "$1^!"
 192                 ;;
 193         *)
 194                 echo "Root commit"
 195                 ;;
 196         esac > "$DOTEST"/patch
 197         test -f "$MSG" ||
 198                 commit_message "$1" > "$MSG"
 199         test -f "$AUTHOR_SCRIPT" ||
 200                 get_author_ident_from_commit "$1" > "$AUTHOR_SCRIPT"
 201 }
 202
 203 die_with_patch () {
 204         echo "$1" > "$DOTEST"/stopped-sha
 205         make_patch "$1"
 206         git rerere
 207         die "$2"
 208 }
 209
 210 die_abort () {
 211         rm -rf "$DOTEST"
 212         die "$1"
 213 }
 214
 215 has_action () {
 216         sane_grep '^[^#]' "$1" >/dev/null
 217 }
 218
 219 # Run command with GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, and
 220 # GIT_AUTHOR_DATE exported from the current environment.
 221 do_with_author () {
 222         (
 223                 export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_AUTHOR_DATE
 224                 "$@"
 225         )
 226 }
 227
 228 pick_one () {
 229         ff=--ff
 230         case "$1" in -n) sha1=$2; ff= ;; *) sha1=$1 ;; esac
 231         case "$NEVER_FF" in '') ;; ?*) ff= ;; esac
 232         output git rev-parse --verify $sha1 || die "Invalid commit name: $sha1"
 233         test -d "$REWRITTEN" &&
 234                 pick_one_preserving_merges "$@" && return
 235         if test -n "$REBASE_ROOT"
 236         then
 237                 output git cherry-pick "$@"
 238                 return
 239         fi
 240         output git cherry-pick $ff "$@"
 241 }
 242
 243 pick_one_preserving_merges () {
 244         fast_forward=t
 245         case "$1" in
 246         -n)
 247                 fast_forward=f
 248                 sha1=$2
 249                 ;;
 250         *)
 251                 sha1=$1
 252                 ;;
 253         esac
 254         sha1=$(git rev-parse $sha1)
 255
 256         if test -f "$DOTEST"/current-commit
 257         then
 258                 if test "$fast_forward" = t
 259                 then
 260                         while read current_commit
 261                         do
 262                                 git rev-parse HEAD > "$REWRITTEN"/$current_commit
 263                         done <"$DOTEST"/current-commit
 264                         rm "$DOTEST"/current-commit ||
 265                         die "Cannot write current commit's replacement sha1"
 266                 fi
 267         fi
 268
 269         echo $sha1 >> "$DOTEST"/current-commit
 270
 271         # rewrite parents; if none were rewritten, we can fast-forward.
 272         new_parents=
 273         pend=" $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)"
 274         if test "$pend" = " "
 275         then
 276                 pend=" root"
 277         fi
 278         while [ "$pend" != "" ]
 279         do
 280                 p=$(expr "$pend" : ' \([^ ]*\)')
 281                 pend="${pend# $p}"
 282
 283                 if test -f "$REWRITTEN"/$p
 284                 then
 285                         new_p=$(cat "$REWRITTEN"/$p)
 286
 287                         # If the todo reordered commits, and our parent is marked for
 288                         # rewriting, but hasn't been gotten to yet, assume the user meant to
 289                         # drop it on top of the current HEAD
 290                         if test -z "$new_p"
 291                         then
 292                                 new_p=$(git rev-parse HEAD)
 293                         fi
 294
 295                         test $p != $new_p && fast_forward=f
 296                         case "$new_parents" in
 297                         *$new_p*)
 298                                 ;; # do nothing; that parent is already there
 299                         *)
 300                                 new_parents="$new_parents $new_p"
 301                                 ;;
 302                         esac
 303                 else
 304                         if test -f "$DROPPED"/$p
 305                         then
 306                                 fast_forward=f
 307                                 replacement="$(cat "$DROPPED"/$p)"
 308                                 test -z "$replacement" && replacement=root
 309                                 pend=" $replacement$pend"
 310                         else
 311                                 new_parents="$new_parents $p"
 312                         fi
 313                 fi
 314         done
 315         case $fast_forward in
 316         t)
 317                 output warn "Fast-forward to $sha1"
 318                 output git reset --hard $sha1 ||
 319                         die "Cannot fast-forward to $sha1"
 320                 ;;
 321         f)
 322                 first_parent=$(expr "$new_parents" : ' \([^ ]*\)')
 323
 324                 if [ "$1" != "-n" ]
 325                 then
 326                         # detach HEAD to current parent
 327                         output git checkout $first_parent 2> /dev/null ||
 328                                 die "Cannot move HEAD to $first_parent"
 329                 fi
 330
 331                 case "$new_parents" in
 332                 ' '*' '*)
 333                         test "a$1" = a-n && die "Refusing to squash a merge: $sha1"
 334
 335                         # redo merge
 336                         author_script=$(get_author_ident_from_commit $sha1)
 337                         eval "$author_script"
 338                         msg="$(commit_message $sha1)"
 339                         # No point in merging the first parent, that's HEAD
 340                         new_parents=${new_parents# $first_parent}
 341                         if ! do_with_author output \
 342                                 git merge $STRATEGY -m "$msg" $new_parents
 343                         then
 344                                 printf "%s\n" "$msg" > "$GIT_DIR"/MERGE_MSG
 345                                 die_with_patch $sha1 "Error redoing merge $sha1"
 346                         fi
 347                         echo "$sha1 $(git rev-parse HEAD^0)" >> "$REWRITTEN_LIST"
 348                         ;;
 349                 *)
 350                         output git cherry-pick "$@" ||
 351                                 die_with_patch $sha1 "Could not pick $sha1"
 352                         ;;
 353                 esac
 354                 ;;
 355         esac
 356 }
 357
 358 nth_string () {
 359         case "$1" in
 360         *1[0-9]|*[04-9]) echo "$1"th;;
 361         *1) echo "$1"st;;
 362         *2) echo "$1"nd;;
 363         *3) echo "$1"rd;;
 364         esac
 365 }
 366
 367 update_squash_messages () {
 368         if test -f "$SQUASH_MSG"; then
 369                 mv "$SQUASH_MSG" "$SQUASH_MSG".bak || exit
 370                 COUNT=$(($(sed -n \
 371                         -e "1s/^# This is a combination of \(.*\) commits\./\1/p" \
 372                         -e "q" < "$SQUASH_MSG".bak)+1))
 373                 {
 374                         echo "# This is a combination of $COUNT commits."
 375                         sed -e 1d -e '2,/^./{
 376                                 /^$/d
 377                         }' <"$SQUASH_MSG".bak
 378                 } >"$SQUASH_MSG"
 379         else
 380                 commit_message HEAD > "$FIXUP_MSG" || die "Cannot write $FIXUP_MSG"
 381                 COUNT=2
 382                 {
 383                         echo "# This is a combination of 2 commits."
 384                         echo "# The first commit's message is:"
 385                         echo
 386                         cat "$FIXUP_MSG"
 387                 } >"$SQUASH_MSG"
 388         fi
 389         case $1 in
 390         squash)
 391                 rm -f "$FIXUP_MSG"
 392                 echo
 393                 echo "# This is the $(nth_string $COUNT) commit message:"
 394                 echo
 395                 commit_message $2
 396                 ;;
 397         fixup)
 398                 echo
 399                 echo "# The $(nth_string $COUNT) commit message will be skipped:"
 400                 echo
 401                 commit_message $2 | sed -e 's/^/#       /'
 402                 ;;
 403         esac >>"$SQUASH_MSG"
 404 }
 405
 406 peek_next_command () {
 407         sed -n -e "/^#/d" -e '/^$/d' -e "s/ .*//p" -e "q" < "$TODO"
 408 }
 409
 410 # A squash/fixup has failed.  Prepare the long version of the squash
 411 # commit message, then die_with_patch.  This code path requires the
 412 # user to edit the combined commit message for all commits that have
 413 # been squashed/fixedup so far.  So also erase the old squash
 414 # messages, effectively causing the combined commit to be used as the
 415 # new basis for any further squash/fixups.  Args: sha1 rest
 416 die_failed_squash() {
 417         mv "$SQUASH_MSG" "$MSG" || exit
 418         rm -f "$FIXUP_MSG"
 419         cp "$MSG" "$GIT_DIR"/MERGE_MSG || exit
 420         warn
 421         warn "Could not apply $1... $2"
 422         die_with_patch $1 ""
 423 }
 424
 425 flush_rewritten_pending() {
 426         test -s "$REWRITTEN_PENDING" || return
 427         newsha1="$(git rev-parse HEAD^0)"
 428         sed "s/$/ $newsha1/" < "$REWRITTEN_PENDING" >> "$REWRITTEN_LIST"
 429         rm -f "$REWRITTEN_PENDING"
 430 }
 431
 432 record_in_rewritten() {
 433         oldsha1="$(git rev-parse $1)"
 434         echo "$oldsha1" >> "$REWRITTEN_PENDING"
 435
 436         case "$(peek_next_command)" in
 437         squash|s|fixup|f)
 438                 ;;
 439         *)
 440                 flush_rewritten_pending
 441                 ;;
 442         esac
 443 }
 444
 445 do_next () {
 446         rm -f "$MSG" "$AUTHOR_SCRIPT" "$AMEND" || exit
 447         read -r command sha1 rest < "$TODO"
 448         case "$command" in
 449         '#'*|''|noop)
 450                 mark_action_done
 451                 ;;
 452         pick|p)
 453                 comment_for_reflog pick
 454
 455                 mark_action_done
 456                 pick_one $sha1 ||
 457                         die_with_patch $sha1 "Could not apply $sha1... $rest"
 458                 record_in_rewritten $sha1
 459                 ;;
 460         reword|r)
 461                 comment_for_reflog reword
 462
 463                 mark_action_done
 464                 pick_one $sha1 ||
 465                         die_with_patch $sha1 "Could not apply $sha1... $rest"
 466                 git commit --amend --no-post-rewrite
 467                 record_in_rewritten $sha1
 468                 ;;
 469         edit|e)
 470                 comment_for_reflog edit
 471
 472                 mark_action_done
 473                 pick_one $sha1 ||
 474                         die_with_patch $sha1 "Could not apply $sha1... $rest"
 475                 echo "$sha1" > "$DOTEST"/stopped-sha
 476                 make_patch $sha1
 477                 git rev-parse --verify HEAD > "$AMEND"
 478                 warn "Stopped at $sha1... $rest"
 479                 warn "You can amend the commit now, with"
 480                 warn
 481                 warn "  git commit --amend"
 482                 warn
 483                 warn "Once you are satisfied with your changes, run"
 484                 warn
 485                 warn "  git rebase --continue"
 486                 warn
 487                 exit 0
 488                 ;;
 489         squash|s|fixup|f)
 490                 case "$command" in
 491                 squash|s)
 492                         squash_style=squash
 493                         ;;
 494                 fixup|f)
 495                         squash_style=fixup
 496                         ;;
 497                 esac
 498                 comment_for_reflog $squash_style
 499
 500                 test -f "$DONE" && has_action "$DONE" ||
 501                         die "Cannot '$squash_style' without a previous commit"
 502
 503                 mark_action_done
 504                 update_squash_messages $squash_style $sha1
 505                 author_script=$(get_author_ident_from_commit HEAD)
 506                 echo "$author_script" > "$AUTHOR_SCRIPT"
 507                 eval "$author_script"
 508                 output git reset --soft HEAD^
 509                 pick_one -n $sha1 || die_failed_squash $sha1 "$rest"
 510                 case "$(peek_next_command)" in
 511                 squash|s|fixup|f)
 512                         # This is an intermediate commit; its message will only be
 513                         # used in case of trouble.  So use the long version:
 514                         do_with_author output git commit --no-verify -F "$SQUASH_MSG" ||
 515                                 die_failed_squash $sha1 "$rest"
 516                         ;;
 517                 *)
 518                         # This is the final command of this squash/fixup group
 519                         if test -f "$FIXUP_MSG"
 520                         then
 521                                 do_with_author git commit --no-verify -F "$FIXUP_MSG" ||
 522                                         die_failed_squash $sha1 "$rest"
 523                         else
 524                                 cp "$SQUASH_MSG" "$GIT_DIR"/SQUASH_MSG || exit
 525                                 rm -f "$GIT_DIR"/MERGE_MSG
 526                                 do_with_author git commit --no-verify -e ||
 527                                         die_failed_squash $sha1 "$rest"
 528                         fi
 529                         rm -f "$SQUASH_MSG" "$FIXUP_MSG"
 530                         ;;
 531                 esac
 532                 record_in_rewritten $sha1
 533                 ;;
 534         x|"exec")
 535                 read -r command rest < "$TODO"
 536                 mark_action_done
 537                 printf 'Executing: %s\n' "$rest"
 538                 # "exec" command doesn't take a sha1 in the todo-list.
 539                 # => can't just use $sha1 here.
 540                 git rev-parse --verify HEAD > "$DOTEST"/stopped-sha
 541                 ${SHELL:-@SHELL_PATH@} -c "$rest" # Actual execution
 542                 status=$?
 543                 if test "$status" -ne 0
 544                 then
 545                         warn "Execution failed: $rest"
 546                         warn "You can fix the problem, and then run"
 547                         warn
 548                         warn "  git rebase --continue"
 549                         warn
 550                         exit "$status"
 551                 fi
 552                 # Run in subshell because require_clean_work_tree can die.
 553                 if ! (require_clean_work_tree "rebase")
 554                 then
 555                         warn "Commit or stash your changes, and then run"
 556                         warn
 557                         warn "  git rebase --continue"
 558                         warn
 559                         exit 1
 560                 fi
 561                 ;;
 562         *)
 563                 warn "Unknown command: $command $sha1 $rest"
 564                 if git rev-parse --verify -q "$sha1" >/dev/null
 565                 then
 566                         die_with_patch $sha1 "Please fix this in the file $TODO."
 567                 else
 568                         die "Please fix this in the file $TODO."
 569                 fi
 570                 ;;
 571         esac
 572         test -s "$TODO" && return
 573
 574         comment_for_reflog finish &&
 575         HEADNAME=$(cat "$DOTEST"/head-name) &&
 576         OLDHEAD=$(cat "$DOTEST"/head) &&
 577         SHORTONTO=$(git rev-parse --short $(cat "$DOTEST"/onto)) &&
 578         NEWHEAD=$(git rev-parse HEAD) &&
 579         case $HEADNAME in
 580         refs/*)
 581                 message="$GIT_REFLOG_ACTION: $HEADNAME onto $SHORTONTO" &&
 582                 git update-ref -m "$message" $HEADNAME $NEWHEAD $OLDHEAD &&
 583                 git symbolic-ref HEAD $HEADNAME
 584                 ;;
 585         esac && {
 586                 test ! -f "$DOTEST"/verbose ||
 587                         git diff-tree --stat $(cat "$DOTEST"/head)..HEAD
 588         } &&
 589         {
 590                 test -s "$REWRITTEN_LIST" &&
 591                 git notes copy --for-rewrite=rebase < "$REWRITTEN_LIST" ||
 592                 true # we don't care if this copying failed
 593         } &&
 594         if test -x "$GIT_DIR"/hooks/post-rewrite &&
 595                 test -s "$REWRITTEN_LIST"; then
 596                 "$GIT_DIR"/hooks/post-rewrite rebase < "$REWRITTEN_LIST"
 597                 true # we don't care if this hook failed
 598         fi &&
 599         rm -rf "$DOTEST" &&
 600         git gc --auto &&
 601         warn "Successfully rebased and updated $HEADNAME."
 602
 603         exit
 604 }
 605
 606 do_rest () {
 607         while :
 608         do
 609                 do_next
 610         done
 611 }
 612
 613 # skip picking commits whose parents are unchanged
 614 skip_unnecessary_picks () {
 615         fd=3
 616         while read -r command rest
 617         do
 618                 # fd=3 means we skip the command
 619                 case "$fd,$command" in
 620                 3,pick|3,p)
 621                         # pick a commit whose parent is current $ONTO -> skip
 622                         sha1=${rest%% *}
 623                         case "$(git rev-parse --verify --quiet "$sha1"^)" in
 624                         "$ONTO"*)
 625                                 ONTO=$sha1
 626                                 ;;
 627                         *)
 628                                 fd=1
 629                                 ;;
 630                         esac
 631                         ;;
 632                 3,#*|3,)
 633                         # copy comments
 634                         ;;
 635                 *)
 636                         fd=1
 637                         ;;
 638                 esac
 639                 printf '%s\n' "$command${rest:+ }$rest" >&$fd
 640         done <"$TODO" >"$TODO.new" 3>>"$DONE" &&
 641         mv -f "$TODO".new "$TODO" &&
 642         case "$(peek_next_command)" in
 643         squash|s|fixup|f)
 644                 record_in_rewritten "$ONTO"
 645                 ;;
 646         esac ||
 647         die "Could not skip unnecessary pick commands"
 648 }
 649
 650 # check if no other options are set
 651 is_standalone () {
 652         test $# -eq 2 -a "$2" = '--' &&
 653         test -z "$ONTO" &&
 654         test -z "$PRESERVE_MERGES" &&
 655         test -z "$STRATEGY" &&
 656         test -z "$VERBOSE"
 657 }
 658
 659 get_saved_options () {
 660         test -d "$REWRITTEN" && PRESERVE_MERGES=t
 661         test -f "$DOTEST"/strategy && STRATEGY="$(cat "$DOTEST"/strategy)"
 662         test -f "$DOTEST"/verbose && VERBOSE=t
 663         test -f "$DOTEST"/rebase-root && REBASE_ROOT=t
 664 }
 665
 666 # Rearrange the todo list that has both "pick sha1 msg" and
 667 # "pick sha1 fixup!/squash! msg" appears in it so that the latter
 668 # comes immediately after the former, and change "pick" to
 669 # "fixup"/"squash".
 670 rearrange_squash () {
 671         # extract fixup!/squash! lines and resolve any referenced sha1's
 672         while read -r pick sha1 message
 673         do
 674                 case "$message" in
 675                 "squash! "*|"fixup! "*)
 676                         action="${message%%!*}"
 677                         rest="${message#*! }"
 678                         echo "$sha1 $action $rest"
 679                         # if it's a single word, try to resolve to a full sha1 and
 680                         # emit a second copy. This allows us to match on both message
 681                         # and on sha1 prefix
 682                         if test "${rest#* }" = "$rest"; then
 683                                 fullsha="$(git rev-parse -q --verify "$rest" 2>/dev/null)"
 684                                 if test -n "$fullsha"; then
 685                                         # prefix the action to uniquely identify this line as
 686                                         # intended for full sha1 match
 687                                         echo "$sha1 +$action $fullsha"
 688                                 fi
 689                         fi
 690                 esac
 691         done >"$1.sq" <"$1"
 692         test -s "$1.sq" || return
 693
 694         used=
 695         while read -r pick sha1 message
 696         do
 697                 case " $used" in
 698                 *" $sha1 "*) continue ;;
 699                 esac
 700                 printf '%s\n' "$pick $sha1 $message"
 701                 used="$used$sha1 "
 702                 while read -r squash action msg
 703                 do
 704                         case " $used" in
 705                         *" $squash "*) continue ;;
 706                         esac
 707                         emit=0
 708                         case "$action" in
 709                         +*)
 710                                 action="${action#+}"
 711                                 # full sha1 prefix test
 712                                 case "$msg" in "$sha1"*) emit=1;; esac ;;
 713                         *)
 714                                 # message prefix test
 715                                 case "$message" in "$msg"*) emit=1;; esac ;;
 716                         esac
 717                         if test $emit = 1; then
 718                                 printf '%s\n' "$action $squash $action! $msg"
 719                                 used="$used$squash "
 720                         fi
 721                 done <"$1.sq"
 722         done >"$1.rearranged" <"$1"
 723         cat "$1.rearranged" >"$1"
 724         rm -f "$1.sq" "$1.rearranged"
 725 }
 726
 727 LF='
 728 '
 729 parse_onto () {
 730         case "$1" in
 731         *...*)
 732                 if      left=${1%...*} right=${1#*...} &&
 733                         onto=$(git merge-base --all ${left:-HEAD} ${right:-HEAD})
 734                 then
 735                         case "$onto" in
 736                         ?*"$LF"?* | '')
 737                                 exit 1 ;;
 738                         esac
 739                         echo "$onto"
 740                         exit 0
 741                 fi
 742         esac
 743         git rev-parse --verify "$1^0"
 744 }
 745
 746 while test $# != 0
 747 do
 748         case "$1" in
 749         --no-verify)
 750                 OK_TO_SKIP_PRE_REBASE=yes
 751                 ;;
 752         --verify)
 753                 OK_TO_SKIP_PRE_REBASE=
 754                 ;;
 755         --continue)
 756                 is_standalone "$@" || usage
 757                 get_saved_options
 758                 comment_for_reflog continue
 759
 760                 test -d "$DOTEST" || die "No interactive rebase running"
 761
 762                 # Sanity check
 763                 git rev-parse --verify HEAD >/dev/null ||
 764                         die "Cannot read HEAD"
 765                 git update-index --ignore-submodules --refresh &&
 766                         git diff-files --quiet --ignore-submodules ||
 767                         die "Working tree is dirty"
 768
 769                 # do we have anything to commit?
 770                 if git diff-index --cached --quiet --ignore-submodules HEAD --
 771                 then
 772                         : Nothing to commit -- skip this
 773                 else
 774                         . "$AUTHOR_SCRIPT" ||
 775                                 die "Cannot find the author identity"
 776                         amend=
 777                         if test -f "$AMEND"
 778                         then
 779                                 amend=$(git rev-parse --verify HEAD)
 780                                 test "$amend" = $(cat "$AMEND") ||
 781                                 die "\
 782 You have uncommitted changes in your working tree. Please, commit them
 783 first and then run 'git rebase --continue' again."
 784                                 git reset --soft HEAD^ ||
 785                                 die "Cannot rewind the HEAD"
 786                         fi
 787                         do_with_author git commit --no-verify -F "$MSG" -e || {
 788                                 test -n "$amend" && git reset --soft $amend
 789                                 die "Could not commit staged changes."
 790                         }
 791                 fi
 792
 793                 record_in_rewritten "$(cat "$DOTEST"/stopped-sha)"
 794
 795                 require_clean_work_tree "rebase"
 796                 do_rest
 797                 ;;
 798         --abort)
 799                 is_standalone "$@" || usage
 800                 get_saved_options
 801                 comment_for_reflog abort
 802
 803                 git rerere clear
 804                 test -d "$DOTEST" || die "No interactive rebase running"
 805
 806                 HEADNAME=$(cat "$DOTEST"/head-name)
 807                 HEAD=$(cat "$DOTEST"/head)
 808                 case $HEADNAME in
 809                 refs/*)
 810                         git symbolic-ref HEAD $HEADNAME
 811                         ;;
 812                 esac &&
 813                 output git reset --hard $HEAD &&
 814                 rm -rf "$DOTEST"
 815                 exit
 816                 ;;
 817         --skip)
 818                 is_standalone "$@" || usage
 819                 get_saved_options
 820                 comment_for_reflog skip
 821
 822                 git rerere clear
 823                 test -d "$DOTEST" || die "No interactive rebase running"
 824
 825                 output git reset --hard && do_rest
 826                 ;;
 827         -s)
 828                 case "$#,$1" in
 829                 *,*=*)
 830                         STRATEGY="-s "$(expr "z$1" : 'z-[^=]*=\(.*\)') ;;
 831                 1,*)
 832                         usage ;;
 833                 *)
 834                         STRATEGY="-s $2"
 835                         shift ;;
 836                 esac
 837                 ;;
 838         -m)
 839                 # we use merge anyway
 840                 ;;
 841         -v)
 842                 VERBOSE=t
 843                 ;;
 844         -p)
 845                 PRESERVE_MERGES=t
 846                 ;;
 847         -i)
 848                 # yeah, we know
 849                 ;;
 850         --no-ff)
 851                 NEVER_FF=t
 852                 ;;
 853         --root)
 854                 REBASE_ROOT=t
 855                 ;;
 856         --autosquash)
 857                 AUTOSQUASH=t
 858                 ;;
 859         --no-autosquash)
 860                 AUTOSQUASH=
 861                 ;;
 862         --onto)
 863                 shift
 864                 ONTO=$(parse_onto "$1") ||
 865                         die "Does not point to a valid commit: $1"
 866                 ;;
 867         --)
 868                 shift
 869                 test -z "$REBASE_ROOT" -a $# -ge 1 -a $# -le 2 ||
 870                 test ! -z "$REBASE_ROOT" -a $# -le 1 || usage
 871                 test -d "$DOTEST" &&
 872                         die "Interactive rebase already started"
 873
 874                 git var GIT_COMMITTER_IDENT >/dev/null ||
 875                         die "You need to set your committer info first"
 876
 877                 if test -z "$REBASE_ROOT"
 878                 then
 879                         UPSTREAM_ARG="$1"
 880                         UPSTREAM=$(git rev-parse --verify "$1") || die "Invalid base"
 881                         test -z "$ONTO" && ONTO=$UPSTREAM
 882                         shift
 883                 else
 884                         UPSTREAM=
 885                         UPSTREAM_ARG=--root
 886                         test -z "$ONTO" &&
 887                                 die "You must specify --onto when using --root"
 888                 fi
 889                 run_pre_rebase_hook "$UPSTREAM_ARG" "$@"
 890
 891                 comment_for_reflog start
 892
 893                 require_clean_work_tree "rebase" "Please commit or stash them."
 894
 895                 if test ! -z "$1"
 896                 then
 897                         output git checkout "$1" ||
 898                                 die "Could not checkout $1"
 899                 fi
 900
 901                 HEAD=$(git rev-parse --verify HEAD) || die "No HEAD?"
 902                 mkdir "$DOTEST" || die "Could not create temporary $DOTEST"
 903
 904                 : > "$DOTEST"/interactive || die "Could not mark as interactive"
 905                 git symbolic-ref HEAD > "$DOTEST"/head-name 2> /dev/null ||
 906                         echo "detached HEAD" > "$DOTEST"/head-name
 907
 908                 echo $HEAD > "$DOTEST"/head
 909                 case "$REBASE_ROOT" in
 910                 '')
 911                         rm -f "$DOTEST"/rebase-root ;;
 912                 *)
 913                         : >"$DOTEST"/rebase-root ;;
 914                 esac
 915                 echo $ONTO > "$DOTEST"/onto
 916                 test -z "$STRATEGY" || echo "$STRATEGY" > "$DOTEST"/strategy
 917                 test t = "$VERBOSE" && : > "$DOTEST"/verbose
 918                 if test t = "$PRESERVE_MERGES"
 919                 then
 920                         if test -z "$REBASE_ROOT"
 921                         then
 922                                 mkdir "$REWRITTEN" &&
 923                                 for c in $(git merge-base --all $HEAD $UPSTREAM)
 924                                 do
 925                                         echo $ONTO > "$REWRITTEN"/$c ||
 926                                                 die "Could not init rewritten commits"
 927                                 done
 928                         else
 929                                 mkdir "$REWRITTEN" &&
 930                                 echo $ONTO > "$REWRITTEN"/root ||
 931                                         die "Could not init rewritten commits"
 932                         fi
 933                         # No cherry-pick because our first pass is to determine
 934                         # parents to rewrite and skipping dropped commits would
 935                         # prematurely end our probe
 936                         MERGES_OPTION=
 937                         first_after_upstream="$(git rev-list --reverse --first-parent $UPSTREAM..$HEAD | head -n 1)"
 938                 else
 939                         MERGES_OPTION="--no-merges --cherry-pick"
 940                 fi
 941
 942                 SHORTHEAD=$(git rev-parse --short $HEAD)
 943                 SHORTONTO=$(git rev-parse --short $ONTO)
 944                 if test -z "$REBASE_ROOT"
 945                         # this is now equivalent to ! -z "$UPSTREAM"
 946                 then
 947                         SHORTUPSTREAM=$(git rev-parse --short $UPSTREAM)
 948                         REVISIONS=$UPSTREAM...$HEAD
 949                         SHORTREVISIONS=$SHORTUPSTREAM..$SHORTHEAD
 950                 else
 951                         REVISIONS=$ONTO...$HEAD
 952                         SHORTREVISIONS=$SHORTHEAD
 953                 fi
 954                 git rev-list $MERGES_OPTION --pretty=oneline --abbrev-commit \
 955                         --abbrev=7 --reverse --left-right --topo-order \
 956                         $REVISIONS | \
 957                         sed -n "s/^>//p" |
 958                 while read -r shortsha1 rest
 959                 do
 960                         if test t != "$PRESERVE_MERGES"
 961                         then
 962                                 printf '%s\n' "pick $shortsha1 $rest" >> "$TODO"
 963                         else
 964                                 sha1=$(git rev-parse $shortsha1)
 965                                 if test -z "$REBASE_ROOT"
 966                                 then
 967                                         preserve=t
 968                                         for p in $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)
 969                                         do
 970                                                 if test -f "$REWRITTEN"/$p -a \( $p != $ONTO -o $sha1 = $first_after_upstream \)
 971                                                 then
 972                                                         preserve=f
 973                                                 fi
 974                                         done
 975                                 else
 976                                         preserve=f
 977                                 fi
 978                                 if test f = "$preserve"
 979                                 then
 980                                         touch "$REWRITTEN"/$sha1
 981                                         printf '%s\n' "pick $shortsha1 $rest" >> "$TODO"
 982                                 fi
 983                         fi
 984                 done
 985
 986                 # Watch for commits that been dropped by --cherry-pick
 987                 if test t = "$PRESERVE_MERGES"
 988                 then
 989                         mkdir "$DROPPED"
 990                         # Save all non-cherry-picked changes
 991                         git rev-list $REVISIONS --left-right --cherry-pick | \
 992                                 sed -n "s/^>//p" > "$DOTEST"/not-cherry-picks
 993                         # Now all commits and note which ones are missing in
 994                         # not-cherry-picks and hence being dropped
 995                         git rev-list $REVISIONS |
 996                         while read rev
 997                         do
 998                                 if test -f "$REWRITTEN"/$rev -a "$(sane_grep "$rev" "$DOTEST"/not-cherry-picks)" = ""
 999                                 then
1000                                         # Use -f2 because if rev-list is telling us this commit is
1001                                         # not worthwhile, we don't want to track its multiple heads,
1002                                         # just the history of its first-parent for others that will
1003                                         # be rebasing on top of it
1004                                         git rev-list --parents -1 $rev | cut -d' ' -s -f2 > "$DROPPED"/$rev
1005                                         short=$(git rev-list -1 --abbrev-commit --abbrev=7 $rev)
1006                                         sane_grep -v "^[a-z][a-z]* $short" <"$TODO" > "${TODO}2" ; mv "${TODO}2" "$TODO"
1007                                         rm "$REWRITTEN"/$rev
1008                                 fi
1009                         done
1010                 fi
1011
1012                 test -s "$TODO" || echo noop >> "$TODO"
1013                 test -n "$AUTOSQUASH" && rearrange_squash "$TODO"
1014                 cat >> "$TODO" << EOF
1015
1016 # Rebase $SHORTREVISIONS onto $SHORTONTO
1017 #
1018 # Commands:
1019 #  p, pick = use commit
1020 #  r, reword = use commit, but edit the commit message
1021 #  e, edit = use commit, but stop for amending
1022 #  s, squash = use commit, but meld into previous commit
1023 #  f, fixup = like "squash", but discard this commit's log message
1024 #  x <cmd>, exec <cmd> = Run a shell command <cmd>, and stop if it fails
1025 #
1026 # If you remove a line here THAT COMMIT WILL BE LOST.
1027 # However, if you remove everything, the rebase will be aborted.
1028 #
1029 EOF
1030
1031                 has_action "$TODO" ||
1032                         die_abort "Nothing to do"
1033
1034                 cp "$TODO" "$TODO".backup
1035                 git_editor "$TODO" ||
1036                         die_abort "Could not execute editor"
1037
1038                 has_action "$TODO" ||
1039                         die_abort "Nothing to do"
1040
1041                 test -d "$REWRITTEN" || test -n "$NEVER_FF" || skip_unnecessary_picks
1042
1043                 output git checkout $ONTO || die_abort "could not detach HEAD"
1044                 git update-ref ORIG_HEAD $HEAD
1045                 do_rest
1046                 ;;
1047         esac
1048         shift
1049 done