git-rebase--interactive.sh

   1 # This shell script fragment is sourced by git-rebase to implement
   2 # its interactive mode.  "git rebase --interactive" makes it easy
   3 # to fix up commits in the middle of a series and rearrange commits.
   4 #
   5 # Copyright (c) 2006 Johannes E. Schindelin
   6 #
   7 # The original idea comes from Eric W. Biederman, in
   8 # http://article.gmane.org/gmane.comp.version-control.git/22407
   9 #
  10 # The file containing rebase commands, comments, and empty lines.
  11 # This file is created by "git rebase -i" then edited by the user.  As
  12 # the lines are processed, they are removed from the front of this
  13 # file and written to the tail of $done.
  14 todo="$state_dir"/git-rebase-todo
  15
  16 # The rebase command lines that have already been processed.  A line
  17 # is moved here when it is first handled, before any associated user
  18 # actions.
  19 done="$state_dir"/done
  20
  21 # The commit message that is planned to be used for any changes that
  22 # need to be committed following a user interaction.
  23 msg="$state_dir"/message
  24
  25 # The file into which is accumulated the suggested commit message for
  26 # squash/fixup commands.  When the first of a series of squash/fixups
  27 # is seen, the file is created and the commit message from the
  28 # previous commit and from the first squash/fixup commit are written
  29 # to it.  The commit message for each subsequent squash/fixup commit
  30 # is appended to the file as it is processed.
  31 #
  32 # The first line of the file is of the form
  33 #     # This is a combination of $count commits.
  34 # where $count is the number of commits whose messages have been
  35 # written to the file so far (including the initial "pick" commit).
  36 # Each time that a commit message is processed, this line is read and
  37 # updated.  It is deleted just before the combined commit is made.
  38 squash_msg="$state_dir"/message-squash
  39
  40 # If the current series of squash/fixups has not yet included a squash
  41 # command, then this file exists and holds the commit message of the
  42 # original "pick" commit.  (If the series ends without a "squash"
  43 # command, then this can be used as the commit message of the combined
  44 # commit without opening the editor.)
  45 fixup_msg="$state_dir"/message-fixup
  46
  47 # $rewritten is the name of a directory containing files for each
  48 # commit that is reachable by at least one merge base of $head and
  49 # $upstream. They are not necessarily rewritten, but their children
  50 # might be.  This ensures that commits on merged, but otherwise
  51 # unrelated side branches are left alone. (Think "X" in the man page's
  52 # example.)
  53 rewritten="$state_dir"/rewritten
  54
  55 dropped="$state_dir"/dropped
  56
  57 end="$state_dir"/end
  58 msgnum="$state_dir"/msgnum
  59
  60 # A script to set the GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, and
  61 # GIT_AUTHOR_DATE that will be used for the commit that is currently
  62 # being rebased.
  63 author_script="$state_dir"/author-script
  64
  65 # When an "edit" rebase command is being processed, the SHA1 of the
  66 # commit to be edited is recorded in this file.  When "git rebase
  67 # --continue" is executed, if there are any staged changes then they
  68 # will be amended to the HEAD commit, but only provided the HEAD
  69 # commit is still the commit to be edited.  When any other rebase
  70 # command is processed, this file is deleted.
  71 amend="$state_dir"/amend
  72
  73 # For the post-rewrite hook, we make a list of rewritten commits and
  74 # their new sha1s.  The rewritten-pending list keeps the sha1s of
  75 # commits that have been processed, but not committed yet,
  76 # e.g. because they are waiting for a 'squash' command.
  77 rewritten_list="$state_dir"/rewritten-list
  78 rewritten_pending="$state_dir"/rewritten-pending
  79
  80 strategy_args=
  81 if test -n "$do_merge"
  82 then
  83         strategy_args=${strategy:+--strategy=$strategy}
  84         eval '
  85                 for strategy_opt in '"$strategy_opts"'
  86                 do
  87                         strategy_args="$strategy_args -X$(git rev-parse --sq-quote "${strategy_opt#--}")"
  88                 done
  89         '
  90 fi
  91
  92 GIT_CHERRY_PICK_HELP="$resolvemsg"
  93 export GIT_CHERRY_PICK_HELP
  94
  95 comment_char=$(git config --get core.commentchar 2>/dev/null | cut -c1)
  96 : ${comment_char:=#}
  97
  98 warn () {
  99         printf '%s\n' "$*" >&2
 100 }
 101
 102 # Output the commit message for the specified commit.
 103 commit_message () {
 104         git cat-file commit "$1" | sed "1,/^$/d"
 105 }
 106
 107 orig_reflog_action="$GIT_REFLOG_ACTION"
 108
 109 comment_for_reflog () {
 110         case "$orig_reflog_action" in
 111         ''|rebase*)
 112                 GIT_REFLOG_ACTION="rebase -i ($1)"
 113                 export GIT_REFLOG_ACTION
 114                 ;;
 115         esac
 116 }
 117
 118 last_count=
 119 mark_action_done () {
 120         sed -e 1q < "$todo" >> "$done"
 121         sed -e 1d < "$todo" >> "$todo".new
 122         mv -f "$todo".new "$todo"
 123         new_count=$(git stripspace --strip-comments <"$done" | wc -l)
 124         echo $new_count >"$msgnum"
 125         total=$(($new_count + $(git stripspace --strip-comments <"$todo" | wc -l)))
 126         echo $total >"$end"
 127         if test "$last_count" != "$new_count"
 128         then
 129                 last_count=$new_count
 130                 printf "Rebasing (%d/%d)\r" $new_count $total
 131                 test -z "$verbose" || echo
 132         fi
 133 }
 134
 135 append_todo_help () {
 136         git stripspace --comment-lines >>"$todo" <<\EOF
 137
 138 Commands:
 139  p, pick = use commit
 140  r, reword = use commit, but edit the commit message
 141  e, edit = use commit, but stop for amending
 142  s, squash = use commit, but meld into previous commit
 143  f, fixup = like "squash", but discard this commit's log message
 144  x, exec = run command (the rest of the line) using shell
 145
 146 These lines can be re-ordered; they are executed from top to bottom.
 147
 148 If you remove a line here THAT COMMIT WILL BE LOST.
 149 EOF
 150 }
 151
 152 make_patch () {
 153         sha1_and_parents="$(git rev-list --parents -1 "$1")"
 154         case "$sha1_and_parents" in
 155         ?*' '?*' '?*)
 156                 git diff --cc $sha1_and_parents
 157                 ;;
 158         ?*' '?*)
 159                 git diff-tree -p "$1^!"
 160                 ;;
 161         *)
 162                 echo "Root commit"
 163                 ;;
 164         esac > "$state_dir"/patch
 165         test -f "$msg" ||
 166                 commit_message "$1" > "$msg"
 167         test -f "$author_script" ||
 168                 get_author_ident_from_commit "$1" > "$author_script"
 169 }
 170
 171 die_with_patch () {
 172         echo "$1" > "$state_dir"/stopped-sha
 173         make_patch "$1"
 174         git rerere
 175         die "$2"
 176 }
 177
 178 exit_with_patch () {
 179         echo "$1" > "$state_dir"/stopped-sha
 180         make_patch $1
 181         git rev-parse --verify HEAD > "$amend"
 182         warn "You can amend the commit now, with"
 183         warn
 184         warn "  git commit --amend"
 185         warn
 186         warn "Once you are satisfied with your changes, run"
 187         warn
 188         warn "  git rebase --continue"
 189         warn
 190         exit $2
 191 }
 192
 193 die_abort () {
 194         rm -rf "$state_dir"
 195         die "$1"
 196 }
 197
 198 has_action () {
 199         test -n "$(git stripspace --strip-comments <"$1")"
 200 }
 201
 202 is_empty_commit() {
 203         tree=$(git rev-parse -q --verify "$1"^{tree} 2>/dev/null ||
 204                 die "$1: not a commit that can be picked")
 205         ptree=$(git rev-parse -q --verify "$1"^^{tree} 2>/dev/null ||
 206                 ptree=4b825dc642cb6eb9a060e54bf8d69288fbee4904)
 207         test "$tree" = "$ptree"
 208 }
 209
 210 is_merge_commit()
 211 {
 212         git rev-parse --verify --quiet "$1"^2 >/dev/null 2>&1
 213 }
 214
 215 # Run command with GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, and
 216 # GIT_AUTHOR_DATE exported from the current environment.
 217 do_with_author () {
 218         (
 219                 export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_AUTHOR_DATE
 220                 "$@"
 221         )
 222 }
 223
 224 git_sequence_editor () {
 225         if test -z "$GIT_SEQUENCE_EDITOR"
 226         then
 227                 GIT_SEQUENCE_EDITOR="$(git config sequence.editor)"
 228                 if [ -z "$GIT_SEQUENCE_EDITOR" ]
 229                 then
 230                         GIT_SEQUENCE_EDITOR="$(git var GIT_EDITOR)" || return $?
 231                 fi
 232         fi
 233
 234         eval "$GIT_SEQUENCE_EDITOR" '"$@"'
 235 }
 236
 237 pick_one () {
 238         ff=--ff
 239
 240         case "$1" in -n) sha1=$2; ff= ;; *) sha1=$1 ;; esac
 241         case "$force_rebase" in '') ;; ?*) ff= ;; esac
 242         output git rev-parse --verify $sha1 || die "Invalid commit name: $sha1"
 243
 244         if is_empty_commit "$sha1"
 245         then
 246                 empty_args="--allow-empty"
 247         fi
 248
 249         test -d "$rewritten" &&
 250                 pick_one_preserving_merges "$@" && return
 251         output eval git cherry-pick "$strategy_args" $empty_args $ff "$@"
 252 }
 253
 254 pick_one_preserving_merges () {
 255         fast_forward=t
 256         case "$1" in
 257         -n)
 258                 fast_forward=f
 259                 sha1=$2
 260                 ;;
 261         *)
 262                 sha1=$1
 263                 ;;
 264         esac
 265         sha1=$(git rev-parse $sha1)
 266
 267         if test -f "$state_dir"/current-commit
 268         then
 269                 if test "$fast_forward" = t
 270                 then
 271                         while read current_commit
 272                         do
 273                                 git rev-parse HEAD > "$rewritten"/$current_commit
 274                         done <"$state_dir"/current-commit
 275                         rm "$state_dir"/current-commit ||
 276                         die "Cannot write current commit's replacement sha1"
 277                 fi
 278         fi
 279
 280         echo $sha1 >> "$state_dir"/current-commit
 281
 282         # rewrite parents; if none were rewritten, we can fast-forward.
 283         new_parents=
 284         pend=" $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)"
 285         if test "$pend" = " "
 286         then
 287                 pend=" root"
 288         fi
 289         while [ "$pend" != "" ]
 290         do
 291                 p=$(expr "$pend" : ' \([^ ]*\)')
 292                 pend="${pend# $p}"
 293
 294                 if test -f "$rewritten"/$p
 295                 then
 296                         new_p=$(cat "$rewritten"/$p)
 297
 298                         # If the todo reordered commits, and our parent is marked for
 299                         # rewriting, but hasn't been gotten to yet, assume the user meant to
 300                         # drop it on top of the current HEAD
 301                         if test -z "$new_p"
 302                         then
 303                                 new_p=$(git rev-parse HEAD)
 304                         fi
 305
 306                         test $p != $new_p && fast_forward=f
 307                         case "$new_parents" in
 308                         *$new_p*)
 309                                 ;; # do nothing; that parent is already there
 310                         *)
 311                                 new_parents="$new_parents $new_p"
 312                                 ;;
 313                         esac
 314                 else
 315                         if test -f "$dropped"/$p
 316                         then
 317                                 fast_forward=f
 318                                 replacement="$(cat "$dropped"/$p)"
 319                                 test -z "$replacement" && replacement=root
 320                                 pend=" $replacement$pend"
 321                         else
 322                                 new_parents="$new_parents $p"
 323                         fi
 324                 fi
 325         done
 326         case $fast_forward in
 327         t)
 328                 output warn "Fast-forward to $sha1"
 329                 output git reset --hard $sha1 ||
 330                         die "Cannot fast-forward to $sha1"
 331                 ;;
 332         f)
 333                 first_parent=$(expr "$new_parents" : ' \([^ ]*\)')
 334
 335                 if [ "$1" != "-n" ]
 336                 then
 337                         # detach HEAD to current parent
 338                         output git checkout $first_parent 2> /dev/null ||
 339                                 die "Cannot move HEAD to $first_parent"
 340                 fi
 341
 342                 case "$new_parents" in
 343                 ' '*' '*)
 344                         test "a$1" = a-n && die "Refusing to squash a merge: $sha1"
 345
 346                         # redo merge
 347                         author_script_content=$(get_author_ident_from_commit $sha1)
 348                         eval "$author_script_content"
 349                         msg_content="$(commit_message $sha1)"
 350                         # No point in merging the first parent, that's HEAD
 351                         new_parents=${new_parents# $first_parent}
 352                         merge_args="--no-log --no-ff"
 353                         if ! do_with_author output eval \
 354                         'git merge $merge_args $strategy_args -m "$msg_content" $new_parents'
 355                         then
 356                                 printf "%s\n" "$msg_content" > "$GIT_DIR"/MERGE_MSG
 357                                 die_with_patch $sha1 "Error redoing merge $sha1"
 358                         fi
 359                         echo "$sha1 $(git rev-parse HEAD^0)" >> "$rewritten_list"
 360                         ;;
 361                 *)
 362                         output eval git cherry-pick "$strategy_args" "$@" ||
 363                                 die_with_patch $sha1 "Could not pick $sha1"
 364                         ;;
 365                 esac
 366                 ;;
 367         esac
 368 }
 369
 370 nth_string () {
 371         case "$1" in
 372         *1[0-9]|*[04-9]) echo "$1"th;;
 373         *1) echo "$1"st;;
 374         *2) echo "$1"nd;;
 375         *3) echo "$1"rd;;
 376         esac
 377 }
 378
 379 update_squash_messages () {
 380         if test -f "$squash_msg"; then
 381                 mv "$squash_msg" "$squash_msg".bak || exit
 382                 count=$(($(sed -n \
 383                         -e "1s/^. This is a combination of \(.*\) commits\./\1/p" \
 384                         -e "q" < "$squash_msg".bak)+1))
 385                 {
 386                         printf '%s\n' "$comment_char This is a combination of $count commits."
 387                         sed -e 1d -e '2,/^./{
 388                                 /^$/d
 389                         }' <"$squash_msg".bak
 390                 } >"$squash_msg"
 391         else
 392                 commit_message HEAD > "$fixup_msg" || die "Cannot write $fixup_msg"
 393                 count=2
 394                 {
 395                         printf '%s\n' "$comment_char This is a combination of 2 commits."
 396                         printf '%s\n' "$comment_char The first commit's message is:"
 397                         echo
 398                         cat "$fixup_msg"
 399                 } >"$squash_msg"
 400         fi
 401         case $1 in
 402         squash)
 403                 rm -f "$fixup_msg"
 404                 echo
 405                 printf '%s\n' "$comment_char This is the $(nth_string $count) commit message:"
 406                 echo
 407                 commit_message $2
 408                 ;;
 409         fixup)
 410                 echo
 411                 printf '%s\n' "$comment_char The $(nth_string $count) commit message will be skipped:"
 412                 echo
 413                 # Change the space after the comment character to TAB:
 414                 commit_message $2 | git stripspace --comment-lines | sed -e 's/ /       /'
 415                 ;;
 416         esac >>"$squash_msg"
 417 }
 418
 419 peek_next_command () {
 420         git stripspace --strip-comments <"$todo" | sed -n -e 's/ .*//p' -e q
 421 }
 422
 423 # A squash/fixup has failed.  Prepare the long version of the squash
 424 # commit message, then die_with_patch.  This code path requires the
 425 # user to edit the combined commit message for all commits that have
 426 # been squashed/fixedup so far.  So also erase the old squash
 427 # messages, effectively causing the combined commit to be used as the
 428 # new basis for any further squash/fixups.  Args: sha1 rest
 429 die_failed_squash() {
 430         mv "$squash_msg" "$msg" || exit
 431         rm -f "$fixup_msg"
 432         cp "$msg" "$GIT_DIR"/MERGE_MSG || exit
 433         warn
 434         warn "Could not apply $1... $2"
 435         die_with_patch $1 ""
 436 }
 437
 438 flush_rewritten_pending() {
 439         test -s "$rewritten_pending" || return
 440         newsha1="$(git rev-parse HEAD^0)"
 441         sed "s/$/ $newsha1/" < "$rewritten_pending" >> "$rewritten_list"
 442         rm -f "$rewritten_pending"
 443 }
 444
 445 record_in_rewritten() {
 446         oldsha1="$(git rev-parse $1)"
 447         echo "$oldsha1" >> "$rewritten_pending"
 448
 449         case "$(peek_next_command)" in
 450         squash|s|fixup|f)
 451                 ;;
 452         *)
 453                 flush_rewritten_pending
 454                 ;;
 455         esac
 456 }
 457
 458 do_pick () {
 459         if test "$(git rev-parse HEAD)" = "$squash_onto"
 460         then
 461                 # Set the correct commit message and author info on the
 462                 # sentinel root before cherry-picking the original changes
 463                 # without committing (-n).  Finally, update the sentinel again
 464                 # to include these changes.  If the cherry-pick results in a
 465                 # conflict, this means our behaviour is similar to a standard
 466                 # failed cherry-pick during rebase, with a dirty index to
 467                 # resolve before manually running git commit --amend then git
 468                 # rebase --continue.
 469                 git commit --allow-empty --allow-empty-message --amend \
 470                            --no-post-rewrite -n -q -C $1 &&
 471                         pick_one -n $1 &&
 472                         git commit --allow-empty --allow-empty-message \
 473                                    --amend --no-post-rewrite -n -q -C $1 ||
 474                         die_with_patch $1 "Could not apply $1... $2"
 475         else
 476                 pick_one $1 ||
 477                         die_with_patch $1 "Could not apply $1... $2"
 478         fi
 479 }
 480
 481 do_next () {
 482         rm -f "$msg" "$author_script" "$amend" || exit
 483         read -r command sha1 rest < "$todo"
 484         case "$command" in
 485         "$comment_char"*|''|noop)
 486                 mark_action_done
 487                 ;;
 488         pick|p)
 489                 comment_for_reflog pick
 490
 491                 mark_action_done
 492                 do_pick $sha1 "$rest"
 493                 record_in_rewritten $sha1
 494                 ;;
 495         reword|r)
 496                 comment_for_reflog reword
 497
 498                 mark_action_done
 499                 do_pick $sha1 "$rest"
 500                 git commit --amend --no-post-rewrite || {
 501                         warn "Could not amend commit after successfully picking $sha1... $rest"
 502                         warn "This is most likely due to an empty commit message, or the pre-commit hook"
 503                         warn "failed. If the pre-commit hook failed, you may need to resolve the issue before"
 504                         warn "you are able to reword the commit."
 505                         exit_with_patch $sha1 1
 506                 }
 507                 record_in_rewritten $sha1
 508                 ;;
 509         edit|e)
 510                 comment_for_reflog edit
 511
 512                 mark_action_done
 513                 do_pick $sha1 "$rest"
 514                 warn "Stopped at $sha1... $rest"
 515                 exit_with_patch $sha1 0
 516                 ;;
 517         squash|s|fixup|f)
 518                 case "$command" in
 519                 squash|s)
 520                         squash_style=squash
 521                         ;;
 522                 fixup|f)
 523                         squash_style=fixup
 524                         ;;
 525                 esac
 526                 comment_for_reflog $squash_style
 527
 528                 test -f "$done" && has_action "$done" ||
 529                         die "Cannot '$squash_style' without a previous commit"
 530
 531                 mark_action_done
 532                 update_squash_messages $squash_style $sha1
 533                 author_script_content=$(get_author_ident_from_commit HEAD)
 534                 echo "$author_script_content" > "$author_script"
 535                 eval "$author_script_content"
 536                 if ! pick_one -n $sha1
 537                 then
 538                         git rev-parse --verify HEAD >"$amend"
 539                         die_failed_squash $sha1 "$rest"
 540                 fi
 541                 case "$(peek_next_command)" in
 542                 squash|s|fixup|f)
 543                         # This is an intermediate commit; its message will only be
 544                         # used in case of trouble.  So use the long version:
 545                         do_with_author output git commit --amend --no-verify -F "$squash_msg" ||
 546                                 die_failed_squash $sha1 "$rest"
 547                         ;;
 548                 *)
 549                         # This is the final command of this squash/fixup group
 550                         if test -f "$fixup_msg"
 551                         then
 552                                 do_with_author git commit --amend --no-verify -F "$fixup_msg" ||
 553                                         die_failed_squash $sha1 "$rest"
 554                         else
 555                                 cp "$squash_msg" "$GIT_DIR"/SQUASH_MSG || exit
 556                                 rm -f "$GIT_DIR"/MERGE_MSG
 557                                 do_with_author git commit --amend --no-verify -F "$GIT_DIR"/SQUASH_MSG -e ||
 558                                         die_failed_squash $sha1 "$rest"
 559                         fi
 560                         rm -f "$squash_msg" "$fixup_msg"
 561                         ;;
 562                 esac
 563                 record_in_rewritten $sha1
 564                 ;;
 565         x|"exec")
 566                 read -r command rest < "$todo"
 567                 mark_action_done
 568                 printf 'Executing: %s\n' "$rest"
 569                 # "exec" command doesn't take a sha1 in the todo-list.
 570                 # => can't just use $sha1 here.
 571                 git rev-parse --verify HEAD > "$state_dir"/stopped-sha
 572                 ${SHELL:-@SHELL_PATH@} -c "$rest" # Actual execution
 573                 status=$?
 574                 # Run in subshell because require_clean_work_tree can die.
 575                 dirty=f
 576                 (require_clean_work_tree "rebase" 2>/dev/null) || dirty=t
 577                 if test "$status" -ne 0
 578                 then
 579                         warn "Execution failed: $rest"
 580                         test "$dirty" = f ||
 581                         warn "and made changes to the index and/or the working tree"
 582
 583                         warn "You can fix the problem, and then run"
 584                         warn
 585                         warn "  git rebase --continue"
 586                         warn
 587                         if test $status -eq 127         # command not found
 588                         then
 589                                 status=1
 590                         fi
 591                         exit "$status"
 592                 elif test "$dirty" = t
 593                 then
 594                         warn "Execution succeeded: $rest"
 595                         warn "but left changes to the index and/or the working tree"
 596                         warn "Commit or stash your changes, and then run"
 597                         warn
 598                         warn "  git rebase --continue"
 599                         warn
 600                         exit 1
 601                 fi
 602                 ;;
 603         *)
 604                 warn "Unknown command: $command $sha1 $rest"
 605                 fixtodo="Please fix this using 'git rebase --edit-todo'."
 606                 if git rev-parse --verify -q "$sha1" >/dev/null
 607                 then
 608                         die_with_patch $sha1 "$fixtodo"
 609                 else
 610                         die "$fixtodo"
 611                 fi
 612                 ;;
 613         esac
 614         test -s "$todo" && return
 615
 616         comment_for_reflog finish &&
 617         newhead=$(git rev-parse HEAD) &&
 618         case $head_name in
 619         refs/*)
 620                 message="$GIT_REFLOG_ACTION: $head_name onto $onto" &&
 621                 git update-ref -m "$message" $head_name $newhead $orig_head &&
 622                 git symbolic-ref \
 623                   -m "$GIT_REFLOG_ACTION: returning to $head_name" \
 624                   HEAD $head_name
 625                 ;;
 626         esac && {
 627                 test ! -f "$state_dir"/verbose ||
 628                         git diff-tree --stat $orig_head..HEAD
 629         } &&
 630         {
 631                 test -s "$rewritten_list" &&
 632                 git notes copy --for-rewrite=rebase < "$rewritten_list" ||
 633                 true # we don't care if this copying failed
 634         } &&
 635         if test -x "$GIT_DIR"/hooks/post-rewrite &&
 636                 test -s "$rewritten_list"; then
 637                 "$GIT_DIR"/hooks/post-rewrite rebase < "$rewritten_list"
 638                 true # we don't care if this hook failed
 639         fi &&
 640         warn "Successfully rebased and updated $head_name."
 641
 642         return 1 # not failure; just to break the do_rest loop
 643 }
 644
 645 # can only return 0, when the infinite loop breaks
 646 do_rest () {
 647         while :
 648         do
 649                 do_next || break
 650         done
 651 }
 652
 653 # skip picking commits whose parents are unchanged
 654 skip_unnecessary_picks () {
 655         fd=3
 656         while read -r command rest
 657         do
 658                 # fd=3 means we skip the command
 659                 case "$fd,$command" in
 660                 3,pick|3,p)
 661                         # pick a commit whose parent is current $onto -> skip
 662                         sha1=${rest%% *}
 663                         case "$(git rev-parse --verify --quiet "$sha1"^)" in
 664                         "$onto"*)
 665                                 onto=$sha1
 666                                 ;;
 667                         *)
 668                                 fd=1
 669                                 ;;
 670                         esac
 671                         ;;
 672                 3,"$comment_char"*|3,)
 673                         # copy comments
 674                         ;;
 675                 *)
 676                         fd=1
 677                         ;;
 678                 esac
 679                 printf '%s\n' "$command${rest:+ }$rest" >&$fd
 680         done <"$todo" >"$todo.new" 3>>"$done" &&
 681         mv -f "$todo".new "$todo" &&
 682         case "$(peek_next_command)" in
 683         squash|s|fixup|f)
 684                 record_in_rewritten "$onto"
 685                 ;;
 686         esac ||
 687         die "Could not skip unnecessary pick commands"
 688 }
 689
 690 transform_todo_ids () {
 691         while read -r command rest
 692         do
 693                 case "$command" in
 694                 "$comment_char"* | exec)
 695                         # Be careful for oddball commands like 'exec'
 696                         # that do not have a SHA-1 at the beginning of $rest.
 697                         ;;
 698                 *)
 699                         sha1=$(git rev-parse --verify --quiet "$@" ${rest%% *}) &&
 700                         rest="$sha1 ${rest#* }"
 701                         ;;
 702                 esac
 703                 printf '%s\n' "$command${rest:+ }$rest"
 704         done <"$todo" >"$todo.new" &&
 705         mv -f "$todo.new" "$todo"
 706 }
 707
 708 expand_todo_ids() {
 709         transform_todo_ids
 710 }
 711
 712 collapse_todo_ids() {
 713         transform_todo_ids --short
 714 }
 715
 716 # Rearrange the todo list that has both "pick sha1 msg" and
 717 # "pick sha1 fixup!/squash! msg" appears in it so that the latter
 718 # comes immediately after the former, and change "pick" to
 719 # "fixup"/"squash".
 720 rearrange_squash () {
 721         # extract fixup!/squash! lines and resolve any referenced sha1's
 722         while read -r pick sha1 message
 723         do
 724                 case "$message" in
 725                 "squash! "*|"fixup! "*)
 726                         action="${message%%!*}"
 727                         rest=$message
 728                         prefix=
 729                         # skip all squash! or fixup! (but save for later)
 730                         while :
 731                         do
 732                                 case "$rest" in
 733                                 "squash! "*|"fixup! "*)
 734                                         prefix="$prefix${rest%%!*},"
 735                                         rest="${rest#*! }"
 736                                         ;;
 737                                 *)
 738                                         break
 739                                         ;;
 740                                 esac
 741                         done
 742                         printf '%s %s %s %s\n' "$sha1" "$action" "$prefix" "$rest"
 743                         # if it's a single word, try to resolve to a full sha1 and
 744                         # emit a second copy. This allows us to match on both message
 745                         # and on sha1 prefix
 746                         if test "${rest#* }" = "$rest"; then
 747                                 fullsha="$(git rev-parse -q --verify "$rest" 2>/dev/null)"
 748                                 if test -n "$fullsha"; then
 749                                         # prefix the action to uniquely identify this line as
 750                                         # intended for full sha1 match
 751                                         echo "$sha1 +$action $prefix $fullsha"
 752                                 fi
 753                         fi
 754                 esac
 755         done >"$1.sq" <"$1"
 756         test -s "$1.sq" || return
 757
 758         used=
 759         while read -r pick sha1 message
 760         do
 761                 case " $used" in
 762                 *" $sha1 "*) continue ;;
 763                 esac
 764                 printf '%s\n' "$pick $sha1 $message"
 765                 used="$used$sha1 "
 766                 while read -r squash action msg_prefix msg_content
 767                 do
 768                         case " $used" in
 769                         *" $squash "*) continue ;;
 770                         esac
 771                         emit=0
 772                         case "$action" in
 773                         +*)
 774                                 action="${action#+}"
 775                                 # full sha1 prefix test
 776                                 case "$msg_content" in "$sha1"*) emit=1;; esac ;;
 777                         *)
 778                                 # message prefix test
 779                                 case "$message" in "$msg_content"*) emit=1;; esac ;;
 780                         esac
 781                         if test $emit = 1; then
 782                                 real_prefix=$(echo "$msg_prefix" | sed "s/,/! /g")
 783                                 printf '%s\n' "$action $squash ${real_prefix}$msg_content"
 784                                 used="$used$squash "
 785                         fi
 786                 done <"$1.sq"
 787         done >"$1.rearranged" <"$1"
 788         cat "$1.rearranged" >"$1"
 789         rm -f "$1.sq" "$1.rearranged"
 790 }
 791
 792 # Add commands after a pick or after a squash/fixup serie
 793 # in the todo list.
 794 add_exec_commands () {
 795         {
 796                 first=t
 797                 while read -r insn rest
 798                 do
 799                         case $insn in
 800                         pick)
 801                                 test -n "$first" ||
 802                                 printf "%s" "$cmd"
 803                                 ;;
 804                         esac
 805                         printf "%s %s\n" "$insn" "$rest"
 806                         first=
 807                 done
 808                 printf "%s" "$cmd"
 809         } <"$1" >"$1.new" &&
 810         mv "$1.new" "$1"
 811 }
 812
 813 case "$action" in
 814 continue)
 815         # do we have anything to commit?
 816         if git diff-index --cached --quiet HEAD --
 817         then
 818                 : Nothing to commit -- skip this
 819         else
 820                 if ! test -f "$author_script"
 821                 then
 822                         die "You have staged changes in your working tree. If these changes are meant to be
 823 squashed into the previous commit, run:
 824
 825   git commit --amend
 826
 827 If they are meant to go into a new commit, run:
 828
 829   git commit
 830
 831 In both case, once you're done, continue with:
 832
 833   git rebase --continue
 834 "
 835                 fi
 836                 . "$author_script" ||
 837                         die "Error trying to find the author identity to amend commit"
 838                 if test -f "$amend"
 839                 then
 840                         current_head=$(git rev-parse --verify HEAD)
 841                         test "$current_head" = $(cat "$amend") ||
 842                         die "\
 843 You have uncommitted changes in your working tree. Please, commit them
 844 first and then run 'git rebase --continue' again."
 845                         do_with_author git commit --amend --no-verify -F "$msg" -e ||
 846                                 die "Could not commit staged changes."
 847                 else
 848                         do_with_author git commit --no-verify -F "$msg" -e ||
 849                                 die "Could not commit staged changes."
 850                 fi
 851         fi
 852
 853         record_in_rewritten "$(cat "$state_dir"/stopped-sha)"
 854
 855         require_clean_work_tree "rebase"
 856         do_rest
 857         return 0
 858         ;;
 859 skip)
 860         git rerere clear
 861
 862         do_rest
 863         return 0
 864         ;;
 865 edit-todo)
 866         git stripspace --strip-comments <"$todo" >"$todo".new
 867         mv -f "$todo".new "$todo"
 868         collapse_todo_ids
 869         append_todo_help
 870         git stripspace --comment-lines >>"$todo" <<\EOF
 871
 872 You are editing the todo file of an ongoing interactive rebase.
 873 To continue rebase after editing, run:
 874     git rebase --continue
 875
 876 EOF
 877
 878         git_sequence_editor "$todo" ||
 879                 die "Could not execute editor"
 880         expand_todo_ids
 881
 882         exit
 883         ;;
 884 esac
 885
 886 git var GIT_COMMITTER_IDENT >/dev/null ||
 887         die "You need to set your committer info first"
 888
 889 comment_for_reflog start
 890
 891 if test ! -z "$switch_to"
 892 then
 893         GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $switch_to"
 894         output git checkout "$switch_to" -- ||
 895         die "Could not checkout $switch_to"
 896
 897         comment_for_reflog start
 898 fi
 899
 900 orig_head=$(git rev-parse --verify HEAD) || die "No HEAD?"
 901 mkdir -p "$state_dir" || die "Could not create temporary $state_dir"
 902
 903 : > "$state_dir"/interactive || die "Could not mark as interactive"
 904 write_basic_state
 905 if test t = "$preserve_merges"
 906 then
 907         if test -z "$rebase_root"
 908         then
 909                 mkdir "$rewritten" &&
 910                 for c in $(git merge-base --all $orig_head $upstream)
 911                 do
 912                         echo $onto > "$rewritten"/$c ||
 913                                 die "Could not init rewritten commits"
 914                 done
 915         else
 916                 mkdir "$rewritten" &&
 917                 echo $onto > "$rewritten"/root ||
 918                         die "Could not init rewritten commits"
 919         fi
 920         # No cherry-pick because our first pass is to determine
 921         # parents to rewrite and skipping dropped commits would
 922         # prematurely end our probe
 923         merges_option=
 924 else
 925         merges_option="--no-merges --cherry-pick"
 926 fi
 927
 928 shorthead=$(git rev-parse --short $orig_head)
 929 shortonto=$(git rev-parse --short $onto)
 930 if test -z "$rebase_root"
 931         # this is now equivalent to ! -z "$upstream"
 932 then
 933         shortupstream=$(git rev-parse --short $upstream)
 934         revisions=$upstream...$orig_head
 935         shortrevisions=$shortupstream..$shorthead
 936 else
 937         revisions=$onto...$orig_head
 938         shortrevisions=$shorthead
 939 fi
 940 git rev-list $merges_option --pretty=oneline --abbrev-commit \
 941         --abbrev=7 --reverse --left-right --topo-order \
 942         $revisions | \
 943         sed -n "s/^>//p" |
 944 while read -r shortsha1 rest
 945 do
 946
 947         if test -z "$keep_empty" && is_empty_commit $shortsha1 && ! is_merge_commit $shortsha1
 948         then
 949                 comment_out="$comment_char "
 950         else
 951                 comment_out=
 952         fi
 953
 954         if test t != "$preserve_merges"
 955         then
 956                 printf '%s\n' "${comment_out}pick $shortsha1 $rest" >>"$todo"
 957         else
 958                 sha1=$(git rev-parse $shortsha1)
 959                 if test -z "$rebase_root"
 960                 then
 961                         preserve=t
 962                         for p in $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)
 963                         do
 964                                 if test -f "$rewritten"/$p
 965                                 then
 966                                         preserve=f
 967                                 fi
 968                         done
 969                 else
 970                         preserve=f
 971                 fi
 972                 if test f = "$preserve"
 973                 then
 974                         touch "$rewritten"/$sha1
 975                         printf '%s\n' "${comment_out}pick $shortsha1 $rest" >>"$todo"
 976                 fi
 977         fi
 978 done
 979
 980 # Watch for commits that been dropped by --cherry-pick
 981 if test t = "$preserve_merges"
 982 then
 983         mkdir "$dropped"
 984         # Save all non-cherry-picked changes
 985         git rev-list $revisions --left-right --cherry-pick | \
 986                 sed -n "s/^>//p" > "$state_dir"/not-cherry-picks
 987         # Now all commits and note which ones are missing in
 988         # not-cherry-picks and hence being dropped
 989         git rev-list $revisions |
 990         while read rev
 991         do
 992                 if test -f "$rewritten"/$rev -a "$(sane_grep "$rev" "$state_dir"/not-cherry-picks)" = ""
 993                 then
 994                         # Use -f2 because if rev-list is telling us this commit is
 995                         # not worthwhile, we don't want to track its multiple heads,
 996                         # just the history of its first-parent for others that will
 997                         # be rebasing on top of it
 998                         git rev-list --parents -1 $rev | cut -d' ' -s -f2 > "$dropped"/$rev
 999                         short=$(git rev-list -1 --abbrev-commit --abbrev=7 $rev)
1000                         sane_grep -v "^[a-z][a-z]* $short" <"$todo" > "${todo}2" ; mv "${todo}2" "$todo"
1001                         rm "$rewritten"/$rev
1002                 fi
1003         done
1004 fi
1005
1006 test -s "$todo" || echo noop >> "$todo"
1007 test -n "$autosquash" && rearrange_squash "$todo"
1008 test -n "$cmd" && add_exec_commands "$todo"
1009
1010 cat >>"$todo" <<EOF
1011
1012 $comment_char Rebase $shortrevisions onto $shortonto
1013 EOF
1014 append_todo_help
1015 git stripspace --comment-lines >>"$todo" <<\EOF
1016
1017 However, if you remove everything, the rebase will be aborted.
1018
1019 EOF
1020
1021 if test -z "$keep_empty"
1022 then
1023         printf '%s\n' "$comment_char Note that empty commits are commented out" >>"$todo"
1024 fi
1025
1026
1027 has_action "$todo" ||
1028         die_abort "Nothing to do"
1029
1030 cp "$todo" "$todo".backup
1031 git_sequence_editor "$todo" ||
1032         die_abort "Could not execute editor"
1033
1034 has_action "$todo" ||
1035         die_abort "Nothing to do"
1036
1037 expand_todo_ids
1038
1039 test -d "$rewritten" || test -n "$force_rebase" || skip_unnecessary_picks
1040
1041 GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $onto_name"
1042 output git checkout $onto || die_abort "could not detach HEAD"
1043 git update-ref ORIG_HEAD $orig_head
1044 do_rest