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