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 . git-sh-setup
  14
  15 # The file containing rebase commands, comments, and empty lines.
  16 # This file is created by "git rebase -i" then edited by the user.  As
  17 # the lines are processed, they are removed from the front of this
  18 # file and written to the tail of $done.
  19 todo="$state_dir"/git-rebase-todo
  20
  21 # The rebase command lines that have already been processed.  A line
  22 # is moved here when it is first handled, before any associated user
  23 # actions.
  24 done="$state_dir"/done
  25
  26 # The commit message that is planned to be used for any changes that
  27 # need to be committed following a user interaction.
  28 msg="$state_dir"/message
  29
  30 # The file into which is accumulated the suggested commit message for
  31 # squash/fixup commands.  When the first of a series of squash/fixups
  32 # is seen, the file is created and the commit message from the
  33 # previous commit and from the first squash/fixup commit are written
  34 # to it.  The commit message for each subsequent squash/fixup commit
  35 # is appended to the file as it is processed.
  36 #
  37 # The first line of the file is of the form
  38 #     # This is a combination of $count commits.
  39 # where $count is the number of commits whose messages have been
  40 # written to the file so far (including the initial "pick" commit).
  41 # Each time that a commit message is processed, this line is read and
  42 # updated.  It is deleted just before the combined commit is made.
  43 squash_msg="$state_dir"/message-squash
  44
  45 # If the current series of squash/fixups has not yet included a squash
  46 # command, then this file exists and holds the commit message of the
  47 # original "pick" commit.  (If the series ends without a "squash"
  48 # command, then this can be used as the commit message of the combined
  49 # commit without opening the editor.)
  50 fixup_msg="$state_dir"/message-fixup
  51
  52 # $rewritten is the name of a directory containing files for each
  53 # commit that is reachable by at least one merge base of $head and
  54 # $upstream. They are not necessarily rewritten, but their children
  55 # might be.  This ensures that commits on merged, but otherwise
  56 # unrelated side branches are left alone. (Think "X" in the man page's
  57 # example.)
  58 rewritten="$state_dir"/rewritten
  59
  60 dropped="$state_dir"/dropped
  61
  62 # A script to set the GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, and
  63 # GIT_AUTHOR_DATE that will be used for the commit that is currently
  64 # being rebased.
  65 author_script="$state_dir"/author-script
  66
  67 # When an "edit" rebase command is being processed, the SHA1 of the
  68 # commit to be edited is recorded in this file.  When "git rebase
  69 # --continue" is executed, if there are any staged changes then they
  70 # will be amended to the HEAD commit, but only provided the HEAD
  71 # commit is still the commit to be edited.  When any other rebase
  72 # command is processed, this file is deleted.
  73 amend="$state_dir"/amend
  74
  75 # For the post-rewrite hook, we make a list of rewritten commits and
  76 # their new sha1s.  The rewritten-pending list keeps the sha1s of
  77 # commits that have been processed, but not committed yet,
  78 # e.g. because they are waiting for a 'squash' command.
  79 rewritten_list="$state_dir"/rewritten-list
  80 rewritten_pending="$state_dir"/rewritten-pending
  81
  82 GIT_CHERRY_PICK_HELP="$resolvemsg"
  83 export GIT_CHERRY_PICK_HELP
  84
  85 warn () {
  86         printf '%s\n' "$*" >&2
  87 }
  88
  89 # Output the commit message for the specified commit.
  90 commit_message () {
  91         git cat-file commit "$1" | sed "1,/^$/d"
  92 }
  93
  94 orig_reflog_action="$GIT_REFLOG_ACTION"
  95
  96 comment_for_reflog () {
  97         case "$orig_reflog_action" in
  98         ''|rebase*)
  99                 GIT_REFLOG_ACTION="rebase -i ($1)"
 100                 export GIT_REFLOG_ACTION
 101                 ;;
 102         esac
 103 }
 104
 105 last_count=
 106 mark_action_done () {
 107         sed -e 1q < "$todo" >> "$done"
 108         sed -e 1d < "$todo" >> "$todo".new
 109         mv -f "$todo".new "$todo"
 110         new_count=$(sane_grep -c '^[^#]' < "$done")
 111         total=$(($new_count+$(sane_grep -c '^[^#]' < "$todo")))
 112         if test "$last_count" != "$new_count"
 113         then
 114                 last_count=$new_count
 115                 printf "Rebasing (%d/%d)\r" $new_count $total
 116                 test -z "$verbose" || echo
 117         fi
 118 }
 119
 120 make_patch () {
 121         sha1_and_parents="$(git rev-list --parents -1 "$1")"
 122         case "$sha1_and_parents" in
 123         ?*' '?*' '?*)
 124                 git diff --cc $sha1_and_parents
 125                 ;;
 126         ?*' '?*)
 127                 git diff-tree -p "$1^!"
 128                 ;;
 129         *)
 130                 echo "Root commit"
 131                 ;;
 132         esac > "$state_dir"/patch
 133         test -f "$msg" ||
 134                 commit_message "$1" > "$msg"
 135         test -f "$author_script" ||
 136                 get_author_ident_from_commit "$1" > "$author_script"
 137 }
 138
 139 die_with_patch () {
 140         echo "$1" > "$state_dir"/stopped-sha
 141         make_patch "$1"
 142         git rerere
 143         die "$2"
 144 }
 145
 146 die_abort () {
 147         rm -rf "$state_dir"
 148         die "$1"
 149 }
 150
 151 has_action () {
 152         sane_grep '^[^#]' "$1" >/dev/null
 153 }
 154
 155 # Run command with GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, and
 156 # GIT_AUTHOR_DATE exported from the current environment.
 157 do_with_author () {
 158         (
 159                 export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_AUTHOR_DATE
 160                 "$@"
 161         )
 162 }
 163
 164 pick_one () {
 165         ff=--ff
 166         case "$1" in -n) sha1=$2; ff= ;; *) sha1=$1 ;; esac
 167         case "$force_rebase" in '') ;; ?*) ff= ;; esac
 168         output git rev-parse --verify $sha1 || die "Invalid commit name: $sha1"
 169         test -d "$rewritten" &&
 170                 pick_one_preserving_merges "$@" && return
 171         output git cherry-pick $ff "$@"
 172 }
 173
 174 pick_one_preserving_merges () {
 175         fast_forward=t
 176         case "$1" in
 177         -n)
 178                 fast_forward=f
 179                 sha1=$2
 180                 ;;
 181         *)
 182                 sha1=$1
 183                 ;;
 184         esac
 185         sha1=$(git rev-parse $sha1)
 186
 187         if test -f "$state_dir"/current-commit
 188         then
 189                 if test "$fast_forward" = t
 190                 then
 191                         while read current_commit
 192                         do
 193                                 git rev-parse HEAD > "$rewritten"/$current_commit
 194                         done <"$state_dir"/current-commit
 195                         rm "$state_dir"/current-commit ||
 196                         die "Cannot write current commit's replacement sha1"
 197                 fi
 198         fi
 199
 200         echo $sha1 >> "$state_dir"/current-commit
 201
 202         # rewrite parents; if none were rewritten, we can fast-forward.
 203         new_parents=
 204         pend=" $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)"
 205         if test "$pend" = " "
 206         then
 207                 pend=" root"
 208         fi
 209         while [ "$pend" != "" ]
 210         do
 211                 p=$(expr "$pend" : ' \([^ ]*\)')
 212                 pend="${pend# $p}"
 213
 214                 if test -f "$rewritten"/$p
 215                 then
 216                         new_p=$(cat "$rewritten"/$p)
 217
 218                         # If the todo reordered commits, and our parent is marked for
 219                         # rewriting, but hasn't been gotten to yet, assume the user meant to
 220                         # drop it on top of the current HEAD
 221                         if test -z "$new_p"
 222                         then
 223                                 new_p=$(git rev-parse HEAD)
 224                         fi
 225
 226                         test $p != $new_p && fast_forward=f
 227                         case "$new_parents" in
 228                         *$new_p*)
 229                                 ;; # do nothing; that parent is already there
 230                         *)
 231                                 new_parents="$new_parents $new_p"
 232                                 ;;
 233                         esac
 234                 else
 235                         if test -f "$dropped"/$p
 236                         then
 237                                 fast_forward=f
 238                                 replacement="$(cat "$dropped"/$p)"
 239                                 test -z "$replacement" && replacement=root
 240                                 pend=" $replacement$pend"
 241                         else
 242                                 new_parents="$new_parents $p"
 243                         fi
 244                 fi
 245         done
 246         case $fast_forward in
 247         t)
 248                 output warn "Fast-forward to $sha1"
 249                 output git reset --hard $sha1 ||
 250                         die "Cannot fast-forward to $sha1"
 251                 ;;
 252         f)
 253                 first_parent=$(expr "$new_parents" : ' \([^ ]*\)')
 254
 255                 if [ "$1" != "-n" ]
 256                 then
 257                         # detach HEAD to current parent
 258                         output git checkout $first_parent 2> /dev/null ||
 259                                 die "Cannot move HEAD to $first_parent"
 260                 fi
 261
 262                 case "$new_parents" in
 263                 ' '*' '*)
 264                         test "a$1" = a-n && die "Refusing to squash a merge: $sha1"
 265
 266                         # redo merge
 267                         author_script_content=$(get_author_ident_from_commit $sha1)
 268                         eval "$author_script_content"
 269                         msg_content="$(commit_message $sha1)"
 270                         # No point in merging the first parent, that's HEAD
 271                         new_parents=${new_parents# $first_parent}
 272                         if ! do_with_author output \
 273                                 git merge --no-ff ${strategy:+-s $strategy} -m \
 274                                         "$msg_content" $new_parents
 275                         then
 276                                 printf "%s\n" "$msg_content" > "$GIT_DIR"/MERGE_MSG
 277                                 die_with_patch $sha1 "Error redoing merge $sha1"
 278                         fi
 279                         echo "$sha1 $(git rev-parse HEAD^0)" >> "$rewritten_list"
 280                         ;;
 281                 *)
 282                         output git cherry-pick "$@" ||
 283                                 die_with_patch $sha1 "Could not pick $sha1"
 284                         ;;
 285                 esac
 286                 ;;
 287         esac
 288 }
 289
 290 nth_string () {
 291         case "$1" in
 292         *1[0-9]|*[04-9]) echo "$1"th;;
 293         *1) echo "$1"st;;
 294         *2) echo "$1"nd;;
 295         *3) echo "$1"rd;;
 296         esac
 297 }
 298
 299 update_squash_messages () {
 300         if test -f "$squash_msg"; then
 301                 mv "$squash_msg" "$squash_msg".bak || exit
 302                 count=$(($(sed -n \
 303                         -e "1s/^# This is a combination of \(.*\) commits\./\1/p" \
 304                         -e "q" < "$squash_msg".bak)+1))
 305                 {
 306                         echo "# This is a combination of $count commits."
 307                         sed -e 1d -e '2,/^./{
 308                                 /^$/d
 309                         }' <"$squash_msg".bak
 310                 } >"$squash_msg"
 311         else
 312                 commit_message HEAD > "$fixup_msg" || die "Cannot write $fixup_msg"
 313                 count=2
 314                 {
 315                         echo "# This is a combination of 2 commits."
 316                         echo "# The first commit's message is:"
 317                         echo
 318                         cat "$fixup_msg"
 319                 } >"$squash_msg"
 320         fi
 321         case $1 in
 322         squash)
 323                 rm -f "$fixup_msg"
 324                 echo
 325                 echo "# This is the $(nth_string $count) commit message:"
 326                 echo
 327                 commit_message $2
 328                 ;;
 329         fixup)
 330                 echo
 331                 echo "# The $(nth_string $count) commit message will be skipped:"
 332                 echo
 333                 commit_message $2 | sed -e 's/^/#       /'
 334                 ;;
 335         esac >>"$squash_msg"
 336 }
 337
 338 peek_next_command () {
 339         sed -n -e "/^#/d" -e '/^$/d' -e "s/ .*//p" -e "q" < "$todo"
 340 }
 341
 342 # A squash/fixup has failed.  Prepare the long version of the squash
 343 # commit message, then die_with_patch.  This code path requires the
 344 # user to edit the combined commit message for all commits that have
 345 # been squashed/fixedup so far.  So also erase the old squash
 346 # messages, effectively causing the combined commit to be used as the
 347 # new basis for any further squash/fixups.  Args: sha1 rest
 348 die_failed_squash() {
 349         mv "$squash_msg" "$msg" || exit
 350         rm -f "$fixup_msg"
 351         cp "$msg" "$GIT_DIR"/MERGE_MSG || exit
 352         warn
 353         warn "Could not apply $1... $2"
 354         die_with_patch $1 ""
 355 }
 356
 357 flush_rewritten_pending() {
 358         test -s "$rewritten_pending" || return
 359         newsha1="$(git rev-parse HEAD^0)"
 360         sed "s/$/ $newsha1/" < "$rewritten_pending" >> "$rewritten_list"
 361         rm -f "$rewritten_pending"
 362 }
 363
 364 record_in_rewritten() {
 365         oldsha1="$(git rev-parse $1)"
 366         echo "$oldsha1" >> "$rewritten_pending"
 367
 368         case "$(peek_next_command)" in
 369         squash|s|fixup|f)
 370                 ;;
 371         *)
 372                 flush_rewritten_pending
 373                 ;;
 374         esac
 375 }
 376
 377 do_next () {
 378         rm -f "$msg" "$author_script" "$amend" || exit
 379         read -r command sha1 rest < "$todo"
 380         case "$command" in
 381         '#'*|''|noop)
 382                 mark_action_done
 383                 ;;
 384         pick|p)
 385                 comment_for_reflog pick
 386
 387                 mark_action_done
 388                 pick_one $sha1 ||
 389                         die_with_patch $sha1 "Could not apply $sha1... $rest"
 390                 record_in_rewritten $sha1
 391                 ;;
 392         reword|r)
 393                 comment_for_reflog reword
 394
 395                 mark_action_done
 396                 pick_one $sha1 ||
 397                         die_with_patch $sha1 "Could not apply $sha1... $rest"
 398                 git commit --amend --no-post-rewrite
 399                 record_in_rewritten $sha1
 400                 ;;
 401         edit|e)
 402                 comment_for_reflog edit
 403
 404                 mark_action_done
 405                 pick_one $sha1 ||
 406                         die_with_patch $sha1 "Could not apply $sha1... $rest"
 407                 echo "$sha1" > "$state_dir"/stopped-sha
 408                 make_patch $sha1
 409                 git rev-parse --verify HEAD > "$amend"
 410                 warn "Stopped at $sha1... $rest"
 411                 warn "You can amend the commit now, with"
 412                 warn
 413                 warn "  git commit --amend"
 414                 warn
 415                 warn "Once you are satisfied with your changes, run"
 416                 warn
 417                 warn "  git rebase --continue"
 418                 warn
 419                 exit 0
 420                 ;;
 421         squash|s|fixup|f)
 422                 case "$command" in
 423                 squash|s)
 424                         squash_style=squash
 425                         ;;
 426                 fixup|f)
 427                         squash_style=fixup
 428                         ;;
 429                 esac
 430                 comment_for_reflog $squash_style
 431
 432                 test -f "$done" && has_action "$done" ||
 433                         die "Cannot '$squash_style' without a previous commit"
 434
 435                 mark_action_done
 436                 update_squash_messages $squash_style $sha1
 437                 author_script_content=$(get_author_ident_from_commit HEAD)
 438                 echo "$author_script_content" > "$author_script"
 439                 eval "$author_script_content"
 440                 output git reset --soft HEAD^
 441                 pick_one -n $sha1 || die_failed_squash $sha1 "$rest"
 442                 case "$(peek_next_command)" in
 443                 squash|s|fixup|f)
 444                         # This is an intermediate commit; its message will only be
 445                         # used in case of trouble.  So use the long version:
 446                         do_with_author output git commit --no-verify -F "$squash_msg" ||
 447                                 die_failed_squash $sha1 "$rest"
 448                         ;;
 449                 *)
 450                         # This is the final command of this squash/fixup group
 451                         if test -f "$fixup_msg"
 452                         then
 453                                 do_with_author git commit --no-verify -F "$fixup_msg" ||
 454                                         die_failed_squash $sha1 "$rest"
 455                         else
 456                                 cp "$squash_msg" "$GIT_DIR"/SQUASH_MSG || exit
 457                                 rm -f "$GIT_DIR"/MERGE_MSG
 458                                 do_with_author git commit --no-verify -e ||
 459                                         die_failed_squash $sha1 "$rest"
 460                         fi
 461                         rm -f "$squash_msg" "$fixup_msg"
 462                         ;;
 463                 esac
 464                 record_in_rewritten $sha1
 465                 ;;
 466         x|"exec")
 467                 read -r command rest < "$todo"
 468                 mark_action_done
 469                 printf 'Executing: %s\n' "$rest"
 470                 # "exec" command doesn't take a sha1 in the todo-list.
 471                 # => can't just use $sha1 here.
 472                 git rev-parse --verify HEAD > "$state_dir"/stopped-sha
 473                 ${SHELL:-@SHELL_PATH@} -c "$rest" # Actual execution
 474                 status=$?
 475                 # Run in subshell because require_clean_work_tree can die.
 476                 dirty=f
 477                 (require_clean_work_tree "rebase" 2>/dev/null) || dirty=t
 478                 if test "$status" -ne 0
 479                 then
 480                         warn "Execution failed: $rest"
 481                         test "$dirty" = f ||
 482                         warn "and made changes to the index and/or the working tree"
 483
 484                         warn "You can fix the problem, and then run"
 485                         warn
 486                         warn "  git rebase --continue"
 487                         warn
 488                         exit "$status"
 489                 elif test "$dirty" = t
 490                 then
 491                         warn "Execution succeeded: $rest"
 492                         warn "but left changes to the index and/or the working tree"
 493                         warn "Commit or stash your changes, and then run"
 494                         warn
 495                         warn "  git rebase --continue"
 496                         warn
 497                         exit 1
 498                 fi
 499                 ;;
 500         *)
 501                 warn "Unknown command: $command $sha1 $rest"
 502                 if git rev-parse --verify -q "$sha1" >/dev/null
 503                 then
 504                         die_with_patch $sha1 "Please fix this in the file $todo."
 505                 else
 506                         die "Please fix this in the file $todo."
 507                 fi
 508                 ;;
 509         esac
 510         test -s "$todo" && return
 511
 512         comment_for_reflog finish &&
 513         shortonto=$(git rev-parse --short $onto) &&
 514         newhead=$(git rev-parse HEAD) &&
 515         case $head_name in
 516         refs/*)
 517                 message="$GIT_REFLOG_ACTION: $head_name onto $shortonto" &&
 518                 git update-ref -m "$message" $head_name $newhead $orig_head &&
 519                 git symbolic-ref \
 520                   -m "$GIT_REFLOG_ACTION: returning to $head_name" \
 521                   HEAD $head_name
 522                 ;;
 523         esac && {
 524                 test ! -f "$state_dir"/verbose ||
 525                         git diff-tree --stat $orig_head..HEAD
 526         } &&
 527         {
 528                 test -s "$rewritten_list" &&
 529                 git notes copy --for-rewrite=rebase < "$rewritten_list" ||
 530                 true # we don't care if this copying failed
 531         } &&
 532         if test -x "$GIT_DIR"/hooks/post-rewrite &&
 533                 test -s "$rewritten_list"; then
 534                 "$GIT_DIR"/hooks/post-rewrite rebase < "$rewritten_list"
 535                 true # we don't care if this hook failed
 536         fi &&
 537         rm -rf "$state_dir" &&
 538         git gc --auto &&
 539         warn "Successfully rebased and updated $head_name."
 540
 541         exit
 542 }
 543
 544 do_rest () {
 545         while :
 546         do
 547                 do_next
 548         done
 549 }
 550
 551 # skip picking commits whose parents are unchanged
 552 skip_unnecessary_picks () {
 553         fd=3
 554         while read -r command rest
 555         do
 556                 # fd=3 means we skip the command
 557                 case "$fd,$command" in
 558                 3,pick|3,p)
 559                         # pick a commit whose parent is current $onto -> skip
 560                         sha1=${rest%% *}
 561                         case "$(git rev-parse --verify --quiet "$sha1"^)" in
 562                         "$onto"*)
 563                                 onto=$sha1
 564                                 ;;
 565                         *)
 566                                 fd=1
 567                                 ;;
 568                         esac
 569                         ;;
 570                 3,#*|3,)
 571                         # copy comments
 572                         ;;
 573                 *)
 574                         fd=1
 575                         ;;
 576                 esac
 577                 printf '%s\n' "$command${rest:+ }$rest" >&$fd
 578         done <"$todo" >"$todo.new" 3>>"$done" &&
 579         mv -f "$todo".new "$todo" &&
 580         case "$(peek_next_command)" in
 581         squash|s|fixup|f)
 582                 record_in_rewritten "$onto"
 583                 ;;
 584         esac ||
 585         die "Could not skip unnecessary pick commands"
 586 }
 587
 588 # Rearrange the todo list that has both "pick sha1 msg" and
 589 # "pick sha1 fixup!/squash! msg" appears in it so that the latter
 590 # comes immediately after the former, and change "pick" to
 591 # "fixup"/"squash".
 592 rearrange_squash () {
 593         # extract fixup!/squash! lines and resolve any referenced sha1's
 594         while read -r pick sha1 message
 595         do
 596                 case "$message" in
 597                 "squash! "*|"fixup! "*)
 598                         action="${message%%!*}"
 599                         rest="${message#*! }"
 600                         echo "$sha1 $action $rest"
 601                         # if it's a single word, try to resolve to a full sha1 and
 602                         # emit a second copy. This allows us to match on both message
 603                         # and on sha1 prefix
 604                         if test "${rest#* }" = "$rest"; then
 605                                 fullsha="$(git rev-parse -q --verify "$rest" 2>/dev/null)"
 606                                 if test -n "$fullsha"; then
 607                                         # prefix the action to uniquely identify this line as
 608                                         # intended for full sha1 match
 609                                         echo "$sha1 +$action $fullsha"
 610                                 fi
 611                         fi
 612                 esac
 613         done >"$1.sq" <"$1"
 614         test -s "$1.sq" || return
 615
 616         used=
 617         while read -r pick sha1 message
 618         do
 619                 case " $used" in
 620                 *" $sha1 "*) continue ;;
 621                 esac
 622                 printf '%s\n' "$pick $sha1 $message"
 623                 used="$used$sha1 "
 624                 while read -r squash action msg_content
 625                 do
 626                         case " $used" in
 627                         *" $squash "*) continue ;;
 628                         esac
 629                         emit=0
 630                         case "$action" in
 631                         +*)
 632                                 action="${action#+}"
 633                                 # full sha1 prefix test
 634                                 case "$msg_content" in "$sha1"*) emit=1;; esac ;;
 635                         *)
 636                                 # message prefix test
 637                                 case "$message" in "$msg_content"*) emit=1;; esac ;;
 638                         esac
 639                         if test $emit = 1; then
 640                                 printf '%s\n' "$action $squash $action! $msg_content"
 641                                 used="$used$squash "
 642                         fi
 643                 done <"$1.sq"
 644         done >"$1.rearranged" <"$1"
 645         cat "$1.rearranged" >"$1"
 646         rm -f "$1.sq" "$1.rearranged"
 647 }
 648
 649 case "$action" in
 650 continue)
 651         # do we have anything to commit?
 652         if git diff-index --cached --quiet --ignore-submodules HEAD --
 653         then
 654                 : Nothing to commit -- skip this
 655         else
 656                 if ! test -f "$author_script"
 657                 then
 658                         die "You have staged changes in your working tree. If these changes are meant to be
 659 squashed into the previous commit, run:
 660
 661   git commit --amend
 662
 663 If they are meant to go into a new commit, run:
 664
 665   git commit
 666
 667 In both case, once you're done, continue with:
 668
 669   git rebase --continue
 670 "
 671                 fi
 672                 . "$author_script" ||
 673                         die "Error trying to find the author identity to amend commit"
 674                 current_head=
 675                 if test -f "$amend"
 676                 then
 677                         current_head=$(git rev-parse --verify HEAD)
 678                         test "$current_head" = $(cat "$amend") ||
 679                         die "\
 680 You have uncommitted changes in your working tree. Please, commit them
 681 first and then run 'git rebase --continue' again."
 682                         git reset --soft HEAD^ ||
 683                         die "Cannot rewind the HEAD"
 684                 fi
 685                 do_with_author git commit --no-verify -F "$msg" -e || {
 686                         test -n "$current_head" && git reset --soft $current_head
 687                         die "Could not commit staged changes."
 688                 }
 689         fi
 690
 691         record_in_rewritten "$(cat "$state_dir"/stopped-sha)"
 692
 693         require_clean_work_tree "rebase"
 694         do_rest
 695         ;;
 696 skip)
 697         git rerere clear
 698
 699         do_rest
 700         ;;
 701 esac
 702
 703 git var GIT_COMMITTER_IDENT >/dev/null ||
 704         die "You need to set your committer info first"
 705
 706 comment_for_reflog start
 707
 708 if test ! -z "$switch_to"
 709 then
 710         output git checkout "$switch_to" -- ||
 711                 die "Could not checkout $switch_to"
 712 fi
 713
 714 orig_head=$(git rev-parse --verify HEAD) || die "No HEAD?"
 715 mkdir "$state_dir" || die "Could not create temporary $state_dir"
 716
 717 : > "$state_dir"/interactive || die "Could not mark as interactive"
 718 write_basic_state
 719 if test t = "$preserve_merges"
 720 then
 721         if test -z "$rebase_root"
 722         then
 723                 mkdir "$rewritten" &&
 724                 for c in $(git merge-base --all $orig_head $upstream)
 725                 do
 726                         echo $onto > "$rewritten"/$c ||
 727                                 die "Could not init rewritten commits"
 728                 done
 729         else
 730                 mkdir "$rewritten" &&
 731                 echo $onto > "$rewritten"/root ||
 732                         die "Could not init rewritten commits"
 733         fi
 734         # No cherry-pick because our first pass is to determine
 735         # parents to rewrite and skipping dropped commits would
 736         # prematurely end our probe
 737         merges_option=
 738 else
 739         merges_option="--no-merges --cherry-pick"
 740 fi
 741
 742 shorthead=$(git rev-parse --short $orig_head)
 743 shortonto=$(git rev-parse --short $onto)
 744 if test -z "$rebase_root"
 745         # this is now equivalent to ! -z "$upstream"
 746 then
 747         shortupstream=$(git rev-parse --short $upstream)
 748         revisions=$upstream...$orig_head
 749         shortrevisions=$shortupstream..$shorthead
 750 else
 751         revisions=$onto...$orig_head
 752         shortrevisions=$shorthead
 753 fi
 754 git rev-list $merges_option --pretty=oneline --abbrev-commit \
 755         --abbrev=7 --reverse --left-right --topo-order \
 756         $revisions | \
 757         sed -n "s/^>//p" |
 758 while read -r shortsha1 rest
 759 do
 760         if test t != "$preserve_merges"
 761         then
 762                 printf '%s\n' "pick $shortsha1 $rest" >> "$todo"
 763         else
 764                 sha1=$(git rev-parse $shortsha1)
 765                 if test -z "$rebase_root"
 766                 then
 767                         preserve=t
 768                         for p in $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)
 769                         do
 770                                 if test -f "$rewritten"/$p
 771                                 then
 772                                         preserve=f
 773                                 fi
 774                         done
 775                 else
 776                         preserve=f
 777                 fi
 778                 if test f = "$preserve"
 779                 then
 780                         touch "$rewritten"/$sha1
 781                         printf '%s\n' "pick $shortsha1 $rest" >> "$todo"
 782                 fi
 783         fi
 784 done
 785
 786 # Watch for commits that been dropped by --cherry-pick
 787 if test t = "$preserve_merges"
 788 then
 789         mkdir "$dropped"
 790         # Save all non-cherry-picked changes
 791         git rev-list $revisions --left-right --cherry-pick | \
 792                 sed -n "s/^>//p" > "$state_dir"/not-cherry-picks
 793         # Now all commits and note which ones are missing in
 794         # not-cherry-picks and hence being dropped
 795         git rev-list $revisions |
 796         while read rev
 797         do
 798                 if test -f "$rewritten"/$rev -a "$(sane_grep "$rev" "$state_dir"/not-cherry-picks)" = ""
 799                 then
 800                         # Use -f2 because if rev-list is telling us this commit is
 801                         # not worthwhile, we don't want to track its multiple heads,
 802                         # just the history of its first-parent for others that will
 803                         # be rebasing on top of it
 804                         git rev-list --parents -1 $rev | cut -d' ' -s -f2 > "$dropped"/$rev
 805                         short=$(git rev-list -1 --abbrev-commit --abbrev=7 $rev)
 806                         sane_grep -v "^[a-z][a-z]* $short" <"$todo" > "${todo}2" ; mv "${todo}2" "$todo"
 807                         rm "$rewritten"/$rev
 808                 fi
 809         done
 810 fi
 811
 812 test -s "$todo" || echo noop >> "$todo"
 813 test -n "$autosquash" && rearrange_squash "$todo"
 814 cat >> "$todo" << EOF
 815
 816 # Rebase $shortrevisions onto $shortonto
 817 #
 818 # Commands:
 819 #  p, pick = use commit
 820 #  r, reword = use commit, but edit the commit message
 821 #  e, edit = use commit, but stop for amending
 822 #  s, squash = use commit, but meld into previous commit
 823 #  f, fixup = like "squash", but discard this commit's log message
 824 #  x, exec = run command (the rest of the line) using shell
 825 #
 826 # If you remove a line here THAT COMMIT WILL BE LOST.
 827 # However, if you remove everything, the rebase will be aborted.
 828 #
 829 EOF
 830
 831 has_action "$todo" ||
 832         die_abort "Nothing to do"
 833
 834 cp "$todo" "$todo".backup
 835 git_editor "$todo" ||
 836         die_abort "Could not execute editor"
 837
 838 has_action "$todo" ||
 839         die_abort "Nothing to do"
 840
 841 test -d "$rewritten" || test -n "$force_rebase" || skip_unnecessary_picks
 842
 843 output git checkout $onto || die_abort "could not detach HEAD"
 844 git update-ref ORIG_HEAD $orig_head
 845 do_rest