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 exit_with_patch () {
 147         echo "$1" > "$state_dir"/stopped-sha
 148         make_patch $1
 149         git rev-parse --verify HEAD > "$amend"
 150         warn "You can amend the commit now, with"
 151         warn
 152         warn "  git commit --amend"
 153         warn
 154         warn "Once you are satisfied with your changes, run"
 155         warn
 156         warn "  git rebase --continue"
 157         warn
 158         exit $2
 159 }
 160
 161 die_abort () {
 162         rm -rf "$state_dir"
 163         die "$1"
 164 }
 165
 166 has_action () {
 167         sane_grep '^[^#]' "$1" >/dev/null
 168 }
 169
 170 is_empty_commit() {
 171         tree=$(git rev-parse -q --verify "$1"^{tree} 2>/dev/null ||
 172                 die "$1: not a commit that can be picked")
 173         ptree=$(git rev-parse -q --verify "$1"^^{tree} 2>/dev/null ||
 174                 ptree=4b825dc642cb6eb9a060e54bf8d69288fbee4904)
 175         test "$tree" = "$ptree"
 176 }
 177
 178 # Run command with GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, and
 179 # GIT_AUTHOR_DATE exported from the current environment.
 180 do_with_author () {
 181         (
 182                 export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_AUTHOR_DATE
 183                 "$@"
 184         )
 185 }
 186
 187 git_sequence_editor () {
 188         if test -z "$GIT_SEQUENCE_EDITOR"
 189         then
 190                 GIT_SEQUENCE_EDITOR="$(git config sequence.editor)"
 191                 if [ -z "$GIT_SEQUENCE_EDITOR" ]
 192                 then
 193                         GIT_SEQUENCE_EDITOR="$(git var GIT_EDITOR)" || return $?
 194                 fi
 195         fi
 196
 197         eval "$GIT_SEQUENCE_EDITOR" '"$@"'
 198 }
 199
 200 pick_one () {
 201         ff=--ff
 202
 203         case "$1" in -n) sha1=$2; ff= ;; *) sha1=$1 ;; esac
 204         case "$force_rebase" in '') ;; ?*) ff= ;; esac
 205         output git rev-parse --verify $sha1 || die "Invalid commit name: $sha1"
 206
 207         if is_empty_commit "$sha1"
 208         then
 209                 empty_args="--allow-empty"
 210         fi
 211
 212         test -d "$rewritten" &&
 213                 pick_one_preserving_merges "$@" && return
 214         output git cherry-pick $empty_args $ff "$@"
 215 }
 216
 217 pick_one_preserving_merges () {
 218         fast_forward=t
 219         case "$1" in
 220         -n)
 221                 fast_forward=f
 222                 sha1=$2
 223                 ;;
 224         *)
 225                 sha1=$1
 226                 ;;
 227         esac
 228         sha1=$(git rev-parse $sha1)
 229
 230         if test -f "$state_dir"/current-commit
 231         then
 232                 if test "$fast_forward" = t
 233                 then
 234                         while read current_commit
 235                         do
 236                                 git rev-parse HEAD > "$rewritten"/$current_commit
 237                         done <"$state_dir"/current-commit
 238                         rm "$state_dir"/current-commit ||
 239                         die "Cannot write current commit's replacement sha1"
 240                 fi
 241         fi
 242
 243         echo $sha1 >> "$state_dir"/current-commit
 244
 245         # rewrite parents; if none were rewritten, we can fast-forward.
 246         new_parents=
 247         pend=" $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)"
 248         if test "$pend" = " "
 249         then
 250                 pend=" root"
 251         fi
 252         while [ "$pend" != "" ]
 253         do
 254                 p=$(expr "$pend" : ' \([^ ]*\)')
 255                 pend="${pend# $p}"
 256
 257                 if test -f "$rewritten"/$p
 258                 then
 259                         new_p=$(cat "$rewritten"/$p)
 260
 261                         # If the todo reordered commits, and our parent is marked for
 262                         # rewriting, but hasn't been gotten to yet, assume the user meant to
 263                         # drop it on top of the current HEAD
 264                         if test -z "$new_p"
 265                         then
 266                                 new_p=$(git rev-parse HEAD)
 267                         fi
 268
 269                         test $p != $new_p && fast_forward=f
 270                         case "$new_parents" in
 271                         *$new_p*)
 272                                 ;; # do nothing; that parent is already there
 273                         *)
 274                                 new_parents="$new_parents $new_p"
 275                                 ;;
 276                         esac
 277                 else
 278                         if test -f "$dropped"/$p
 279                         then
 280                                 fast_forward=f
 281                                 replacement="$(cat "$dropped"/$p)"
 282                                 test -z "$replacement" && replacement=root
 283                                 pend=" $replacement$pend"
 284                         else
 285                                 new_parents="$new_parents $p"
 286                         fi
 287                 fi
 288         done
 289         case $fast_forward in
 290         t)
 291                 output warn "Fast-forward to $sha1"
 292                 output git reset --hard $sha1 ||
 293                         die "Cannot fast-forward to $sha1"
 294                 ;;
 295         f)
 296                 first_parent=$(expr "$new_parents" : ' \([^ ]*\)')
 297
 298                 if [ "$1" != "-n" ]
 299                 then
 300                         # detach HEAD to current parent
 301                         output git checkout $first_parent 2> /dev/null ||
 302                                 die "Cannot move HEAD to $first_parent"
 303                 fi
 304
 305                 case "$new_parents" in
 306                 ' '*' '*)
 307                         test "a$1" = a-n && die "Refusing to squash a merge: $sha1"
 308
 309                         # redo merge
 310                         author_script_content=$(get_author_ident_from_commit $sha1)
 311                         eval "$author_script_content"
 312                         msg_content="$(commit_message $sha1)"
 313                         # No point in merging the first parent, that's HEAD
 314                         new_parents=${new_parents# $first_parent}
 315                         if ! do_with_author output \
 316                                 git merge --no-ff ${strategy:+-s $strategy} -m \
 317                                         "$msg_content" $new_parents
 318                         then
 319                                 printf "%s\n" "$msg_content" > "$GIT_DIR"/MERGE_MSG
 320                                 die_with_patch $sha1 "Error redoing merge $sha1"
 321                         fi
 322                         echo "$sha1 $(git rev-parse HEAD^0)" >> "$rewritten_list"
 323                         ;;
 324                 *)
 325                         output git cherry-pick "$@" ||
 326                                 die_with_patch $sha1 "Could not pick $sha1"
 327                         ;;
 328                 esac
 329                 ;;
 330         esac
 331 }
 332
 333 nth_string () {
 334         case "$1" in
 335         *1[0-9]|*[04-9]) echo "$1"th;;
 336         *1) echo "$1"st;;
 337         *2) echo "$1"nd;;
 338         *3) echo "$1"rd;;
 339         esac
 340 }
 341
 342 update_squash_messages () {
 343         if test -f "$squash_msg"; then
 344                 mv "$squash_msg" "$squash_msg".bak || exit
 345                 count=$(($(sed -n \
 346                         -e "1s/^# This is a combination of \(.*\) commits\./\1/p" \
 347                         -e "q" < "$squash_msg".bak)+1))
 348                 {
 349                         echo "# This is a combination of $count commits."
 350                         sed -e 1d -e '2,/^./{
 351                                 /^$/d
 352                         }' <"$squash_msg".bak
 353                 } >"$squash_msg"
 354         else
 355                 commit_message HEAD > "$fixup_msg" || die "Cannot write $fixup_msg"
 356                 count=2
 357                 {
 358                         echo "# This is a combination of 2 commits."
 359                         echo "# The first commit's message is:"
 360                         echo
 361                         cat "$fixup_msg"
 362                 } >"$squash_msg"
 363         fi
 364         case $1 in
 365         squash)
 366                 rm -f "$fixup_msg"
 367                 echo
 368                 echo "# This is the $(nth_string $count) commit message:"
 369                 echo
 370                 commit_message $2
 371                 ;;
 372         fixup)
 373                 echo
 374                 echo "# The $(nth_string $count) commit message will be skipped:"
 375                 echo
 376                 commit_message $2 | sed -e 's/^/#       /'
 377                 ;;
 378         esac >>"$squash_msg"
 379 }
 380
 381 peek_next_command () {
 382         sed -n -e "/^#/d" -e '/^$/d' -e "s/ .*//p" -e "q" < "$todo"
 383 }
 384
 385 # A squash/fixup has failed.  Prepare the long version of the squash
 386 # commit message, then die_with_patch.  This code path requires the
 387 # user to edit the combined commit message for all commits that have
 388 # been squashed/fixedup so far.  So also erase the old squash
 389 # messages, effectively causing the combined commit to be used as the
 390 # new basis for any further squash/fixups.  Args: sha1 rest
 391 die_failed_squash() {
 392         mv "$squash_msg" "$msg" || exit
 393         rm -f "$fixup_msg"
 394         cp "$msg" "$GIT_DIR"/MERGE_MSG || exit
 395         warn
 396         warn "Could not apply $1... $2"
 397         die_with_patch $1 ""
 398 }
 399
 400 flush_rewritten_pending() {
 401         test -s "$rewritten_pending" || return
 402         newsha1="$(git rev-parse HEAD^0)"
 403         sed "s/$/ $newsha1/" < "$rewritten_pending" >> "$rewritten_list"
 404         rm -f "$rewritten_pending"
 405 }
 406
 407 record_in_rewritten() {
 408         oldsha1="$(git rev-parse $1)"
 409         echo "$oldsha1" >> "$rewritten_pending"
 410
 411         case "$(peek_next_command)" in
 412         squash|s|fixup|f)
 413                 ;;
 414         *)
 415                 flush_rewritten_pending
 416                 ;;
 417         esac
 418 }
 419
 420 do_next () {
 421         rm -f "$msg" "$author_script" "$amend" || exit
 422         read -r command sha1 rest < "$todo"
 423         case "$command" in
 424         '#'*|''|noop)
 425                 mark_action_done
 426                 ;;
 427         pick|p)
 428                 comment_for_reflog pick
 429
 430                 mark_action_done
 431                 pick_one $sha1 ||
 432                         die_with_patch $sha1 "Could not apply $sha1... $rest"
 433                 record_in_rewritten $sha1
 434                 ;;
 435         reword|r)
 436                 comment_for_reflog reword
 437
 438                 mark_action_done
 439                 pick_one $sha1 ||
 440                         die_with_patch $sha1 "Could not apply $sha1... $rest"
 441                 git commit --amend --no-post-rewrite || {
 442                         warn "Could not amend commit after successfully picking $sha1... $rest"
 443                         warn "This is most likely due to an empty commit message, or the pre-commit hook"
 444                         warn "failed. If the pre-commit hook failed, you may need to resolve the issue before"
 445                         warn "you are able to reword the commit."
 446                         exit_with_patch $sha1 1
 447                 }
 448                 record_in_rewritten $sha1
 449                 ;;
 450         edit|e)
 451                 comment_for_reflog edit
 452
 453                 mark_action_done
 454                 pick_one $sha1 ||
 455                         die_with_patch $sha1 "Could not apply $sha1... $rest"
 456                 warn "Stopped at $sha1... $rest"
 457                 exit_with_patch $sha1 0
 458                 ;;
 459         squash|s|fixup|f)
 460                 case "$command" in
 461                 squash|s)
 462                         squash_style=squash
 463                         ;;
 464                 fixup|f)
 465                         squash_style=fixup
 466                         ;;
 467                 esac
 468                 comment_for_reflog $squash_style
 469
 470                 test -f "$done" && has_action "$done" ||
 471                         die "Cannot '$squash_style' without a previous commit"
 472
 473                 mark_action_done
 474                 update_squash_messages $squash_style $sha1
 475                 author_script_content=$(get_author_ident_from_commit HEAD)
 476                 echo "$author_script_content" > "$author_script"
 477                 eval "$author_script_content"
 478                 output git reset --soft HEAD^
 479                 pick_one -n $sha1 || die_failed_squash $sha1 "$rest"
 480                 case "$(peek_next_command)" in
 481                 squash|s|fixup|f)
 482                         # This is an intermediate commit; its message will only be
 483                         # used in case of trouble.  So use the long version:
 484                         do_with_author output git commit --no-verify -F "$squash_msg" ||
 485                                 die_failed_squash $sha1 "$rest"
 486                         ;;
 487                 *)
 488                         # This is the final command of this squash/fixup group
 489                         if test -f "$fixup_msg"
 490                         then
 491                                 do_with_author git commit --no-verify -F "$fixup_msg" ||
 492                                         die_failed_squash $sha1 "$rest"
 493                         else
 494                                 cp "$squash_msg" "$GIT_DIR"/SQUASH_MSG || exit
 495                                 rm -f "$GIT_DIR"/MERGE_MSG
 496                                 do_with_author git commit --no-verify -e ||
 497                                         die_failed_squash $sha1 "$rest"
 498                         fi
 499                         rm -f "$squash_msg" "$fixup_msg"
 500                         ;;
 501                 esac
 502                 record_in_rewritten $sha1
 503                 ;;
 504         x|"exec")
 505                 read -r command rest < "$todo"
 506                 mark_action_done
 507                 printf 'Executing: %s\n' "$rest"
 508                 # "exec" command doesn't take a sha1 in the todo-list.
 509                 # => can't just use $sha1 here.
 510                 git rev-parse --verify HEAD > "$state_dir"/stopped-sha
 511                 ${SHELL:-@SHELL_PATH@} -c "$rest" # Actual execution
 512                 status=$?
 513                 # Run in subshell because require_clean_work_tree can die.
 514                 dirty=f
 515                 (require_clean_work_tree "rebase" 2>/dev/null) || dirty=t
 516                 if test "$status" -ne 0
 517                 then
 518                         warn "Execution failed: $rest"
 519                         test "$dirty" = f ||
 520                         warn "and made changes to the index and/or the working tree"
 521
 522                         warn "You can fix the problem, and then run"
 523                         warn
 524                         warn "  git rebase --continue"
 525                         warn
 526                         exit "$status"
 527                 elif test "$dirty" = t
 528                 then
 529                         warn "Execution succeeded: $rest"
 530                         warn "but left changes to the index and/or the working tree"
 531                         warn "Commit or stash your changes, and then run"
 532                         warn
 533                         warn "  git rebase --continue"
 534                         warn
 535                         exit 1
 536                 fi
 537                 ;;
 538         *)
 539                 warn "Unknown command: $command $sha1 $rest"
 540                 if git rev-parse --verify -q "$sha1" >/dev/null
 541                 then
 542                         die_with_patch $sha1 "Please fix this in the file $todo."
 543                 else
 544                         die "Please fix this in the file $todo."
 545                 fi
 546                 ;;
 547         esac
 548         test -s "$todo" && return
 549
 550         comment_for_reflog finish &&
 551         shortonto=$(git rev-parse --short $onto) &&
 552         newhead=$(git rev-parse HEAD) &&
 553         case $head_name in
 554         refs/*)
 555                 message="$GIT_REFLOG_ACTION: $head_name onto $shortonto" &&
 556                 git update-ref -m "$message" $head_name $newhead $orig_head &&
 557                 git symbolic-ref \
 558                   -m "$GIT_REFLOG_ACTION: returning to $head_name" \
 559                   HEAD $head_name
 560                 ;;
 561         esac && {
 562                 test ! -f "$state_dir"/verbose ||
 563                         git diff-tree --stat $orig_head..HEAD
 564         } &&
 565         {
 566                 test -s "$rewritten_list" &&
 567                 git notes copy --for-rewrite=rebase < "$rewritten_list" ||
 568                 true # we don't care if this copying failed
 569         } &&
 570         if test -x "$GIT_DIR"/hooks/post-rewrite &&
 571                 test -s "$rewritten_list"; then
 572                 "$GIT_DIR"/hooks/post-rewrite rebase < "$rewritten_list"
 573                 true # we don't care if this hook failed
 574         fi &&
 575         rm -rf "$state_dir" &&
 576         git gc --auto &&
 577         warn "Successfully rebased and updated $head_name."
 578
 579         exit
 580 }
 581
 582 do_rest () {
 583         while :
 584         do
 585                 do_next
 586         done
 587 }
 588
 589 # skip picking commits whose parents are unchanged
 590 skip_unnecessary_picks () {
 591         fd=3
 592         while read -r command rest
 593         do
 594                 # fd=3 means we skip the command
 595                 case "$fd,$command" in
 596                 3,pick|3,p)
 597                         # pick a commit whose parent is current $onto -> skip
 598                         sha1=${rest%% *}
 599                         case "$(git rev-parse --verify --quiet "$sha1"^)" in
 600                         "$onto"*)
 601                                 onto=$sha1
 602                                 ;;
 603                         *)
 604                                 fd=1
 605                                 ;;
 606                         esac
 607                         ;;
 608                 3,#*|3,)
 609                         # copy comments
 610                         ;;
 611                 *)
 612                         fd=1
 613                         ;;
 614                 esac
 615                 printf '%s\n' "$command${rest:+ }$rest" >&$fd
 616         done <"$todo" >"$todo.new" 3>>"$done" &&
 617         mv -f "$todo".new "$todo" &&
 618         case "$(peek_next_command)" in
 619         squash|s|fixup|f)
 620                 record_in_rewritten "$onto"
 621                 ;;
 622         esac ||
 623         die "Could not skip unnecessary pick commands"
 624 }
 625
 626 # Rearrange the todo list that has both "pick sha1 msg" and
 627 # "pick sha1 fixup!/squash! msg" appears in it so that the latter
 628 # comes immediately after the former, and change "pick" to
 629 # "fixup"/"squash".
 630 rearrange_squash () {
 631         # extract fixup!/squash! lines and resolve any referenced sha1's
 632         while read -r pick sha1 message
 633         do
 634                 case "$message" in
 635                 "squash! "*|"fixup! "*)
 636                         action="${message%%!*}"
 637                         rest="${message#*! }"
 638                         echo "$sha1 $action $rest"
 639                         # if it's a single word, try to resolve to a full sha1 and
 640                         # emit a second copy. This allows us to match on both message
 641                         # and on sha1 prefix
 642                         if test "${rest#* }" = "$rest"; then
 643                                 fullsha="$(git rev-parse -q --verify "$rest" 2>/dev/null)"
 644                                 if test -n "$fullsha"; then
 645                                         # prefix the action to uniquely identify this line as
 646                                         # intended for full sha1 match
 647                                         echo "$sha1 +$action $fullsha"
 648                                 fi
 649                         fi
 650                 esac
 651         done >"$1.sq" <"$1"
 652         test -s "$1.sq" || return
 653
 654         used=
 655         while read -r pick sha1 message
 656         do
 657                 case " $used" in
 658                 *" $sha1 "*) continue ;;
 659                 esac
 660                 printf '%s\n' "$pick $sha1 $message"
 661                 used="$used$sha1 "
 662                 while read -r squash action msg_content
 663                 do
 664                         case " $used" in
 665                         *" $squash "*) continue ;;
 666                         esac
 667                         emit=0
 668                         case "$action" in
 669                         +*)
 670                                 action="${action#+}"
 671                                 # full sha1 prefix test
 672                                 case "$msg_content" in "$sha1"*) emit=1;; esac ;;
 673                         *)
 674                                 # message prefix test
 675                                 case "$message" in "$msg_content"*) emit=1;; esac ;;
 676                         esac
 677                         if test $emit = 1; then
 678                                 printf '%s\n' "$action $squash $action! $msg_content"
 679                                 used="$used$squash "
 680                         fi
 681                 done <"$1.sq"
 682         done >"$1.rearranged" <"$1"
 683         cat "$1.rearranged" >"$1"
 684         rm -f "$1.sq" "$1.rearranged"
 685 }
 686
 687 case "$action" in
 688 continue)
 689         # do we have anything to commit?
 690         if git diff-index --cached --quiet HEAD --
 691         then
 692                 : Nothing to commit -- skip this
 693         else
 694                 if ! test -f "$author_script"
 695                 then
 696                         die "You have staged changes in your working tree. If these changes are meant to be
 697 squashed into the previous commit, run:
 698
 699   git commit --amend
 700
 701 If they are meant to go into a new commit, run:
 702
 703   git commit
 704
 705 In both case, once you're done, continue with:
 706
 707   git rebase --continue
 708 "
 709                 fi
 710                 . "$author_script" ||
 711                         die "Error trying to find the author identity to amend commit"
 712                 current_head=
 713                 if test -f "$amend"
 714                 then
 715                         current_head=$(git rev-parse --verify HEAD)
 716                         test "$current_head" = $(cat "$amend") ||
 717                         die "\
 718 You have uncommitted changes in your working tree. Please, commit them
 719 first and then run 'git rebase --continue' again."
 720                         git reset --soft HEAD^ ||
 721                         die "Cannot rewind the HEAD"
 722                 fi
 723                 do_with_author git commit --no-verify -F "$msg" -e || {
 724                         test -n "$current_head" && git reset --soft $current_head
 725                         die "Could not commit staged changes."
 726                 }
 727         fi
 728
 729         record_in_rewritten "$(cat "$state_dir"/stopped-sha)"
 730
 731         require_clean_work_tree "rebase"
 732         do_rest
 733         ;;
 734 skip)
 735         git rerere clear
 736
 737         do_rest
 738         ;;
 739 esac
 740
 741 git var GIT_COMMITTER_IDENT >/dev/null ||
 742         die "You need to set your committer info first"
 743
 744 comment_for_reflog start
 745
 746 if test ! -z "$switch_to"
 747 then
 748         output git checkout "$switch_to" -- ||
 749                 die "Could not checkout $switch_to"
 750 fi
 751
 752 orig_head=$(git rev-parse --verify HEAD) || die "No HEAD?"
 753 mkdir "$state_dir" || die "Could not create temporary $state_dir"
 754
 755 : > "$state_dir"/interactive || die "Could not mark as interactive"
 756 write_basic_state
 757 if test t = "$preserve_merges"
 758 then
 759         if test -z "$rebase_root"
 760         then
 761                 mkdir "$rewritten" &&
 762                 for c in $(git merge-base --all $orig_head $upstream)
 763                 do
 764                         echo $onto > "$rewritten"/$c ||
 765                                 die "Could not init rewritten commits"
 766                 done
 767         else
 768                 mkdir "$rewritten" &&
 769                 echo $onto > "$rewritten"/root ||
 770                         die "Could not init rewritten commits"
 771         fi
 772         # No cherry-pick because our first pass is to determine
 773         # parents to rewrite and skipping dropped commits would
 774         # prematurely end our probe
 775         merges_option=
 776 else
 777         merges_option="--no-merges --cherry-pick"
 778 fi
 779
 780 shorthead=$(git rev-parse --short $orig_head)
 781 shortonto=$(git rev-parse --short $onto)
 782 if test -z "$rebase_root"
 783         # this is now equivalent to ! -z "$upstream"
 784 then
 785         shortupstream=$(git rev-parse --short $upstream)
 786         revisions=$upstream...$orig_head
 787         shortrevisions=$shortupstream..$shorthead
 788 else
 789         revisions=$onto...$orig_head
 790         shortrevisions=$shorthead
 791 fi
 792 git rev-list $merges_option --pretty=oneline --abbrev-commit \
 793         --abbrev=7 --reverse --left-right --topo-order \
 794         $revisions | \
 795         sed -n "s/^>//p" |
 796 while read -r shortsha1 rest
 797 do
 798
 799         if test -z "$keep_empty" && is_empty_commit $shortsha1
 800         then
 801                 comment_out="# "
 802         else
 803                 comment_out=
 804         fi
 805
 806         if test t != "$preserve_merges"
 807         then
 808                 printf '%s\n' "${comment_out}pick $shortsha1 $rest" >>"$todo"
 809         else
 810                 sha1=$(git rev-parse $shortsha1)
 811                 if test -z "$rebase_root"
 812                 then
 813                         preserve=t
 814                         for p in $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)
 815                         do
 816                                 if test -f "$rewritten"/$p
 817                                 then
 818                                         preserve=f
 819                                 fi
 820                         done
 821                 else
 822                         preserve=f
 823                 fi
 824                 if test f = "$preserve"
 825                 then
 826                         touch "$rewritten"/$sha1
 827                         printf '%s\n' "${comment_out}pick $shortsha1 $rest" >>"$todo"
 828                 fi
 829         fi
 830 done
 831
 832 # Watch for commits that been dropped by --cherry-pick
 833 if test t = "$preserve_merges"
 834 then
 835         mkdir "$dropped"
 836         # Save all non-cherry-picked changes
 837         git rev-list $revisions --left-right --cherry-pick | \
 838                 sed -n "s/^>//p" > "$state_dir"/not-cherry-picks
 839         # Now all commits and note which ones are missing in
 840         # not-cherry-picks and hence being dropped
 841         git rev-list $revisions |
 842         while read rev
 843         do
 844                 if test -f "$rewritten"/$rev -a "$(sane_grep "$rev" "$state_dir"/not-cherry-picks)" = ""
 845                 then
 846                         # Use -f2 because if rev-list is telling us this commit is
 847                         # not worthwhile, we don't want to track its multiple heads,
 848                         # just the history of its first-parent for others that will
 849                         # be rebasing on top of it
 850                         git rev-list --parents -1 $rev | cut -d' ' -s -f2 > "$dropped"/$rev
 851                         short=$(git rev-list -1 --abbrev-commit --abbrev=7 $rev)
 852                         sane_grep -v "^[a-z][a-z]* $short" <"$todo" > "${todo}2" ; mv "${todo}2" "$todo"
 853                         rm "$rewritten"/$rev
 854                 fi
 855         done
 856 fi
 857
 858 test -s "$todo" || echo noop >> "$todo"
 859 test -n "$autosquash" && rearrange_squash "$todo"
 860 cat >> "$todo" << EOF
 861
 862 # Rebase $shortrevisions onto $shortonto
 863 #
 864 # Commands:
 865 #  p, pick = use commit
 866 #  r, reword = use commit, but edit the commit message
 867 #  e, edit = use commit, but stop for amending
 868 #  s, squash = use commit, but meld into previous commit
 869 #  f, fixup = like "squash", but discard this commit's log message
 870 #  x, exec = run command (the rest of the line) using shell
 871 #
 872 # These lines can be re-ordered; they are executed from top to bottom.
 873 #
 874 # If you remove a line here THAT COMMIT WILL BE LOST.
 875 # However, if you remove everything, the rebase will be aborted.
 876 #
 877 EOF
 878
 879 if test -z "$keep_empty"
 880 then
 881         echo "# Note that empty commits are commented out" >>"$todo"
 882 fi
 883
 884
 885 has_action "$todo" ||
 886         die_abort "Nothing to do"
 887
 888 cp "$todo" "$todo".backup
 889 git_sequence_editor "$todo" ||
 890         die_abort "Could not execute editor"
 891
 892 has_action "$todo" ||
 893         die_abort "Nothing to do"
 894
 895 test -d "$rewritten" || test -n "$force_rebase" || skip_unnecessary_picks
 896
 897 output git checkout $onto || die_abort "could not detach HEAD"
 898 git update-ref ORIG_HEAD $orig_head
 899 do_rest