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         gpg_sign_opt_quoted=${gpg_sign_opt:+$(git rev-parse --sq-quote "$gpg_sign_opt")}
 183         warn "You can amend the commit now, with"
 184         warn
 185         warn "  git commit --amend $gpg_sign_opt_quoted"
 186         warn
 187         warn "Once you are satisfied with your changes, run"
 188         warn
 189         warn "  git rebase --continue"
 190         warn
 191         exit $2
 192 }
 193
 194 die_abort () {
 195         rm -rf "$state_dir"
 196         die "$1"
 197 }
 198
 199 has_action () {
 200         test -n "$(git stripspace --strip-comments <"$1")"
 201 }
 202
 203 is_empty_commit() {
 204         tree=$(git rev-parse -q --verify "$1"^{tree} 2>/dev/null ||
 205                 die "$1: not a commit that can be picked")
 206         ptree=$(git rev-parse -q --verify "$1"^^{tree} 2>/dev/null ||
 207                 ptree=4b825dc642cb6eb9a060e54bf8d69288fbee4904)
 208         test "$tree" = "$ptree"
 209 }
 210
 211 is_merge_commit()
 212 {
 213         git rev-parse --verify --quiet "$1"^2 >/dev/null 2>&1
 214 }
 215
 216 # Run command with GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, and
 217 # GIT_AUTHOR_DATE exported from the current environment.
 218 do_with_author () {
 219         (
 220                 export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_AUTHOR_DATE
 221                 "$@"
 222         )
 223 }
 224
 225 git_sequence_editor () {
 226         if test -z "$GIT_SEQUENCE_EDITOR"
 227         then
 228                 GIT_SEQUENCE_EDITOR="$(git config sequence.editor)"
 229                 if [ -z "$GIT_SEQUENCE_EDITOR" ]
 230                 then
 231                         GIT_SEQUENCE_EDITOR="$(git var GIT_EDITOR)" || return $?
 232                 fi
 233         fi
 234
 235         eval "$GIT_SEQUENCE_EDITOR" '"$@"'
 236 }
 237
 238 pick_one () {
 239         ff=--ff
 240
 241         case "$1" in -n) sha1=$2; ff= ;; *) sha1=$1 ;; esac
 242         case "$force_rebase" in '') ;; ?*) ff= ;; esac
 243         output git rev-parse --verify $sha1 || die "Invalid commit name: $sha1"
 244
 245         if is_empty_commit "$sha1"
 246         then
 247                 empty_args="--allow-empty"
 248         fi
 249
 250         test -d "$rewritten" &&
 251                 pick_one_preserving_merges "$@" && return
 252         output eval git cherry-pick \
 253                         ${gpg_sign_opt:+$(git rev-parse --sq-quote "$gpg_sign_opt")} \
 254                         "$strategy_args" $empty_args $ff "$@"
 255 }
 256
 257 pick_one_preserving_merges () {
 258         fast_forward=t
 259         case "$1" in
 260         -n)
 261                 fast_forward=f
 262                 sha1=$2
 263                 ;;
 264         *)
 265                 sha1=$1
 266                 ;;
 267         esac
 268         sha1=$(git rev-parse $sha1)
 269
 270         if test -f "$state_dir"/current-commit
 271         then
 272                 if test "$fast_forward" = t
 273                 then
 274                         while read current_commit
 275                         do
 276                                 git rev-parse HEAD > "$rewritten"/$current_commit
 277                         done <"$state_dir"/current-commit
 278                         rm "$state_dir"/current-commit ||
 279                         die "Cannot write current commit's replacement sha1"
 280                 fi
 281         fi
 282
 283         echo $sha1 >> "$state_dir"/current-commit
 284
 285         # rewrite parents; if none were rewritten, we can fast-forward.
 286         new_parents=
 287         pend=" $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)"
 288         if test "$pend" = " "
 289         then
 290                 pend=" root"
 291         fi
 292         while [ "$pend" != "" ]
 293         do
 294                 p=$(expr "$pend" : ' \([^ ]*\)')
 295                 pend="${pend# $p}"
 296
 297                 if test -f "$rewritten"/$p
 298                 then
 299                         new_p=$(cat "$rewritten"/$p)
 300
 301                         # If the todo reordered commits, and our parent is marked for
 302                         # rewriting, but hasn't been gotten to yet, assume the user meant to
 303                         # drop it on top of the current HEAD
 304                         if test -z "$new_p"
 305                         then
 306                                 new_p=$(git rev-parse HEAD)
 307                         fi
 308
 309                         test $p != $new_p && fast_forward=f
 310                         case "$new_parents" in
 311                         *$new_p*)
 312                                 ;; # do nothing; that parent is already there
 313                         *)
 314                                 new_parents="$new_parents $new_p"
 315                                 ;;
 316                         esac
 317                 else
 318                         if test -f "$dropped"/$p
 319                         then
 320                                 fast_forward=f
 321                                 replacement="$(cat "$dropped"/$p)"
 322                                 test -z "$replacement" && replacement=root
 323                                 pend=" $replacement$pend"
 324                         else
 325                                 new_parents="$new_parents $p"
 326                         fi
 327                 fi
 328         done
 329         case $fast_forward in
 330         t)
 331                 output warn "Fast-forward to $sha1"
 332                 output git reset --hard $sha1 ||
 333                         die "Cannot fast-forward to $sha1"
 334                 ;;
 335         f)
 336                 first_parent=$(expr "$new_parents" : ' \([^ ]*\)')
 337
 338                 if [ "$1" != "-n" ]
 339                 then
 340                         # detach HEAD to current parent
 341                         output git checkout $first_parent 2> /dev/null ||
 342                                 die "Cannot move HEAD to $first_parent"
 343                 fi
 344
 345                 case "$new_parents" in
 346                 ' '*' '*)
 347                         test "a$1" = a-n && die "Refusing to squash a merge: $sha1"
 348
 349                         # redo merge
 350                         author_script_content=$(get_author_ident_from_commit $sha1)
 351                         eval "$author_script_content"
 352                         msg_content="$(commit_message $sha1)"
 353                         # No point in merging the first parent, that's HEAD
 354                         new_parents=${new_parents# $first_parent}
 355                         merge_args="--no-log --no-ff"
 356                         if ! do_with_author output eval \
 357                         'git merge ${gpg_sign_opt:+"$gpg_sign_opt"} \
 358                                 $merge_args $strategy_args -m "$msg_content" $new_parents'
 359                         then
 360                                 printf "%s\n" "$msg_content" > "$GIT_DIR"/MERGE_MSG
 361                                 die_with_patch $sha1 "Error redoing merge $sha1"
 362                         fi
 363                         echo "$sha1 $(git rev-parse HEAD^0)" >> "$rewritten_list"
 364                         ;;
 365                 *)
 366                         output eval git cherry-pick \
 367                                 ${gpg_sign_opt:+$(git rev-parse --sq-quote "$gpg_sign_opt")} \
 368                                 "$strategy_args" "$@" ||
 369                                 die_with_patch $sha1 "Could not pick $sha1"
 370                         ;;
 371                 esac
 372                 ;;
 373         esac
 374 }
 375
 376 nth_string () {
 377         case "$1" in
 378         *1[0-9]|*[04-9]) echo "$1"th;;
 379         *1) echo "$1"st;;
 380         *2) echo "$1"nd;;
 381         *3) echo "$1"rd;;
 382         esac
 383 }
 384
 385 update_squash_messages () {
 386         if test -f "$squash_msg"; then
 387                 mv "$squash_msg" "$squash_msg".bak || exit
 388                 count=$(($(sed -n \
 389                         -e "1s/^. This is a combination of \(.*\) commits\./\1/p" \
 390                         -e "q" < "$squash_msg".bak)+1))
 391                 {
 392                         printf '%s\n' "$comment_char This is a combination of $count commits."
 393                         sed -e 1d -e '2,/^./{
 394                                 /^$/d
 395                         }' <"$squash_msg".bak
 396                 } >"$squash_msg"
 397         else
 398                 commit_message HEAD > "$fixup_msg" || die "Cannot write $fixup_msg"
 399                 count=2
 400                 {
 401                         printf '%s\n' "$comment_char This is a combination of 2 commits."
 402                         printf '%s\n' "$comment_char The first commit's message is:"
 403                         echo
 404                         cat "$fixup_msg"
 405                 } >"$squash_msg"
 406         fi
 407         case $1 in
 408         squash)
 409                 rm -f "$fixup_msg"
 410                 echo
 411                 printf '%s\n' "$comment_char This is the $(nth_string $count) commit message:"
 412                 echo
 413                 commit_message $2
 414                 ;;
 415         fixup)
 416                 echo
 417                 printf '%s\n' "$comment_char The $(nth_string $count) commit message will be skipped:"
 418                 echo
 419                 # Change the space after the comment character to TAB:
 420                 commit_message $2 | git stripspace --comment-lines | sed -e 's/ /       /'
 421                 ;;
 422         esac >>"$squash_msg"
 423 }
 424
 425 peek_next_command () {
 426         git stripspace --strip-comments <"$todo" | sed -n -e 's/ .*//p' -e q
 427 }
 428
 429 # A squash/fixup has failed.  Prepare the long version of the squash
 430 # commit message, then die_with_patch.  This code path requires the
 431 # user to edit the combined commit message for all commits that have
 432 # been squashed/fixedup so far.  So also erase the old squash
 433 # messages, effectively causing the combined commit to be used as the
 434 # new basis for any further squash/fixups.  Args: sha1 rest
 435 die_failed_squash() {
 436         mv "$squash_msg" "$msg" || exit
 437         rm -f "$fixup_msg"
 438         cp "$msg" "$GIT_DIR"/MERGE_MSG || exit
 439         warn
 440         warn "Could not apply $1... $2"
 441         die_with_patch $1 ""
 442 }
 443
 444 flush_rewritten_pending() {
 445         test -s "$rewritten_pending" || return
 446         newsha1="$(git rev-parse HEAD^0)"
 447         sed "s/$/ $newsha1/" < "$rewritten_pending" >> "$rewritten_list"
 448         rm -f "$rewritten_pending"
 449 }
 450
 451 record_in_rewritten() {
 452         oldsha1="$(git rev-parse $1)"
 453         echo "$oldsha1" >> "$rewritten_pending"
 454
 455         case "$(peek_next_command)" in
 456         squash|s|fixup|f)
 457                 ;;
 458         *)
 459                 flush_rewritten_pending
 460                 ;;
 461         esac
 462 }
 463
 464 do_pick () {
 465         if test "$(git rev-parse HEAD)" = "$squash_onto"
 466         then
 467                 # Set the correct commit message and author info on the
 468                 # sentinel root before cherry-picking the original changes
 469                 # without committing (-n).  Finally, update the sentinel again
 470                 # to include these changes.  If the cherry-pick results in a
 471                 # conflict, this means our behaviour is similar to a standard
 472                 # failed cherry-pick during rebase, with a dirty index to
 473                 # resolve before manually running git commit --amend then git
 474                 # rebase --continue.
 475                 git commit --allow-empty --allow-empty-message --amend \
 476                            --no-post-rewrite -n -q -C $1 &&
 477                         pick_one -n $1 &&
 478                         git commit --allow-empty --allow-empty-message \
 479                                    --amend --no-post-rewrite -n -q -C $1 \
 480                                    ${gpg_sign_opt:+"$gpg_sign_opt"} ||
 481                         die_with_patch $1 "Could not apply $1... $2"
 482         else
 483                 pick_one $1 ||
 484                         die_with_patch $1 "Could not apply $1... $2"
 485         fi
 486 }
 487
 488 do_next () {
 489         rm -f "$msg" "$author_script" "$amend" || exit
 490         read -r command sha1 rest < "$todo"
 491         case "$command" in
 492         "$comment_char"*|''|noop)
 493                 mark_action_done
 494                 ;;
 495         pick|p)
 496                 comment_for_reflog pick
 497
 498                 mark_action_done
 499                 do_pick $sha1 "$rest"
 500                 record_in_rewritten $sha1
 501                 ;;
 502         reword|r)
 503                 comment_for_reflog reword
 504
 505                 mark_action_done
 506                 do_pick $sha1 "$rest"
 507                 git commit --amend --no-post-rewrite ${gpg_sign_opt:+"$gpg_sign_opt"} || {
 508                         warn "Could not amend commit after successfully picking $sha1... $rest"
 509                         warn "This is most likely due to an empty commit message, or the pre-commit hook"
 510                         warn "failed. If the pre-commit hook failed, you may need to resolve the issue before"
 511                         warn "you are able to reword the commit."
 512                         exit_with_patch $sha1 1
 513                 }
 514                 record_in_rewritten $sha1
 515                 ;;
 516         edit|e)
 517                 comment_for_reflog edit
 518
 519                 mark_action_done
 520                 do_pick $sha1 "$rest"
 521                 warn "Stopped at $sha1... $rest"
 522                 exit_with_patch $sha1 0
 523                 ;;
 524         squash|s|fixup|f)
 525                 case "$command" in
 526                 squash|s)
 527                         squash_style=squash
 528                         ;;
 529                 fixup|f)
 530                         squash_style=fixup
 531                         ;;
 532                 esac
 533                 comment_for_reflog $squash_style
 534
 535                 test -f "$done" && has_action "$done" ||
 536                         die "Cannot '$squash_style' without a previous commit"
 537
 538                 mark_action_done
 539                 update_squash_messages $squash_style $sha1
 540                 author_script_content=$(get_author_ident_from_commit HEAD)
 541                 echo "$author_script_content" > "$author_script"
 542                 eval "$author_script_content"
 543                 if ! pick_one -n $sha1
 544                 then
 545                         git rev-parse --verify HEAD >"$amend"
 546                         die_failed_squash $sha1 "$rest"
 547                 fi
 548                 case "$(peek_next_command)" in
 549                 squash|s|fixup|f)
 550                         # This is an intermediate commit; its message will only be
 551                         # used in case of trouble.  So use the long version:
 552                         do_with_author output git commit --amend --no-verify -F "$squash_msg" \
 553                                 ${gpg_sign_opt:+"$gpg_sign_opt"} ||
 554                                 die_failed_squash $sha1 "$rest"
 555                         ;;
 556                 *)
 557                         # This is the final command of this squash/fixup group
 558                         if test -f "$fixup_msg"
 559                         then
 560                                 do_with_author git commit --amend --no-verify -F "$fixup_msg" \
 561                                         ${gpg_sign_opt:+"$gpg_sign_opt"} ||
 562                                         die_failed_squash $sha1 "$rest"
 563                         else
 564                                 cp "$squash_msg" "$GIT_DIR"/SQUASH_MSG || exit
 565                                 rm -f "$GIT_DIR"/MERGE_MSG
 566                                 do_with_author git commit --amend --no-verify -F "$GIT_DIR"/SQUASH_MSG -e \
 567                                         ${gpg_sign_opt:+"$gpg_sign_opt"} ||
 568                                         die_failed_squash $sha1 "$rest"
 569                         fi
 570                         rm -f "$squash_msg" "$fixup_msg"
 571                         ;;
 572                 esac
 573                 record_in_rewritten $sha1
 574                 ;;
 575         x|"exec")
 576                 read -r command rest < "$todo"
 577                 mark_action_done
 578                 printf 'Executing: %s\n' "$rest"
 579                 # "exec" command doesn't take a sha1 in the todo-list.
 580                 # => can't just use $sha1 here.
 581                 git rev-parse --verify HEAD > "$state_dir"/stopped-sha
 582                 ${SHELL:-@SHELL_PATH@} -c "$rest" # Actual execution
 583                 status=$?
 584                 # Run in subshell because require_clean_work_tree can die.
 585                 dirty=f
 586                 (require_clean_work_tree "rebase" 2>/dev/null) || dirty=t
 587                 if test "$status" -ne 0
 588                 then
 589                         warn "Execution failed: $rest"
 590                         test "$dirty" = f ||
 591                         warn "and made changes to the index and/or the working tree"
 592
 593                         warn "You can fix the problem, and then run"
 594                         warn
 595                         warn "  git rebase --continue"
 596                         warn
 597                         if test $status -eq 127         # command not found
 598                         then
 599                                 status=1
 600                         fi
 601                         exit "$status"
 602                 elif test "$dirty" = t
 603                 then
 604                         warn "Execution succeeded: $rest"
 605                         warn "but left changes to the index and/or the working tree"
 606                         warn "Commit or stash your changes, and then run"
 607                         warn
 608                         warn "  git rebase --continue"
 609                         warn
 610                         exit 1
 611                 fi
 612                 ;;
 613         *)
 614                 warn "Unknown command: $command $sha1 $rest"
 615                 fixtodo="Please fix this using 'git rebase --edit-todo'."
 616                 if git rev-parse --verify -q "$sha1" >/dev/null
 617                 then
 618                         die_with_patch $sha1 "$fixtodo"
 619                 else
 620                         die "$fixtodo"
 621                 fi
 622                 ;;
 623         esac
 624         test -s "$todo" && return
 625
 626         comment_for_reflog finish &&
 627         newhead=$(git rev-parse HEAD) &&
 628         case $head_name in
 629         refs/*)
 630                 message="$GIT_REFLOG_ACTION: $head_name onto $onto" &&
 631                 git update-ref -m "$message" $head_name $newhead $orig_head &&
 632                 git symbolic-ref \
 633                   -m "$GIT_REFLOG_ACTION: returning to $head_name" \
 634                   HEAD $head_name
 635                 ;;
 636         esac && {
 637                 test ! -f "$state_dir"/verbose ||
 638                         git diff-tree --stat $orig_head..HEAD
 639         } &&
 640         {
 641                 test -s "$rewritten_list" &&
 642                 git notes copy --for-rewrite=rebase < "$rewritten_list" ||
 643                 true # we don't care if this copying failed
 644         } &&
 645         if test -x "$GIT_DIR"/hooks/post-rewrite &&
 646                 test -s "$rewritten_list"; then
 647                 "$GIT_DIR"/hooks/post-rewrite rebase < "$rewritten_list"
 648                 true # we don't care if this hook failed
 649         fi &&
 650         warn "Successfully rebased and updated $head_name."
 651
 652         return 1 # not failure; just to break the do_rest loop
 653 }
 654
 655 # can only return 0, when the infinite loop breaks
 656 do_rest () {
 657         while :
 658         do
 659                 do_next || break
 660         done
 661 }
 662
 663 # skip picking commits whose parents are unchanged
 664 skip_unnecessary_picks () {
 665         fd=3
 666         while read -r command rest
 667         do
 668                 # fd=3 means we skip the command
 669                 case "$fd,$command" in
 670                 3,pick|3,p)
 671                         # pick a commit whose parent is current $onto -> skip
 672                         sha1=${rest%% *}
 673                         case "$(git rev-parse --verify --quiet "$sha1"^)" in
 674                         "$onto"*)
 675                                 onto=$sha1
 676                                 ;;
 677                         *)
 678                                 fd=1
 679                                 ;;
 680                         esac
 681                         ;;
 682                 3,"$comment_char"*|3,)
 683                         # copy comments
 684                         ;;
 685                 *)
 686                         fd=1
 687                         ;;
 688                 esac
 689                 printf '%s\n' "$command${rest:+ }$rest" >&$fd
 690         done <"$todo" >"$todo.new" 3>>"$done" &&
 691         mv -f "$todo".new "$todo" &&
 692         case "$(peek_next_command)" in
 693         squash|s|fixup|f)
 694                 record_in_rewritten "$onto"
 695                 ;;
 696         esac ||
 697         die "Could not skip unnecessary pick commands"
 698 }
 699
 700 transform_todo_ids () {
 701         while read -r command rest
 702         do
 703                 case "$command" in
 704                 "$comment_char"* | exec)
 705                         # Be careful for oddball commands like 'exec'
 706                         # that do not have a SHA-1 at the beginning of $rest.
 707                         ;;
 708                 *)
 709                         sha1=$(git rev-parse --verify --quiet "$@" ${rest%% *}) &&
 710                         rest="$sha1 ${rest#* }"
 711                         ;;
 712                 esac
 713                 printf '%s\n' "$command${rest:+ }$rest"
 714         done <"$todo" >"$todo.new" &&
 715         mv -f "$todo.new" "$todo"
 716 }
 717
 718 expand_todo_ids() {
 719         transform_todo_ids
 720 }
 721
 722 collapse_todo_ids() {
 723         transform_todo_ids --short
 724 }
 725
 726 # Rearrange the todo list that has both "pick sha1 msg" and
 727 # "pick sha1 fixup!/squash! msg" appears in it so that the latter
 728 # comes immediately after the former, and change "pick" to
 729 # "fixup"/"squash".
 730 rearrange_squash () {
 731         # extract fixup!/squash! lines and resolve any referenced sha1's
 732         while read -r pick sha1 message
 733         do
 734                 case "$message" in
 735                 "squash! "*|"fixup! "*)
 736                         action="${message%%!*}"
 737                         rest=$message
 738                         prefix=
 739                         # skip all squash! or fixup! (but save for later)
 740                         while :
 741                         do
 742                                 case "$rest" in
 743                                 "squash! "*|"fixup! "*)
 744                                         prefix="$prefix${rest%%!*},"
 745                                         rest="${rest#*! }"
 746                                         ;;
 747                                 *)
 748                                         break
 749                                         ;;
 750                                 esac
 751                         done
 752                         printf '%s %s %s %s\n' "$sha1" "$action" "$prefix" "$rest"
 753                         # if it's a single word, try to resolve to a full sha1 and
 754                         # emit a second copy. This allows us to match on both message
 755                         # and on sha1 prefix
 756                         if test "${rest#* }" = "$rest"; then
 757                                 fullsha="$(git rev-parse -q --verify "$rest" 2>/dev/null)"
 758                                 if test -n "$fullsha"; then
 759                                         # prefix the action to uniquely identify this line as
 760                                         # intended for full sha1 match
 761                                         echo "$sha1 +$action $prefix $fullsha"
 762                                 fi
 763                         fi
 764                 esac
 765         done >"$1.sq" <"$1"
 766         test -s "$1.sq" || return
 767
 768         used=
 769         while read -r pick sha1 message
 770         do
 771                 case " $used" in
 772                 *" $sha1 "*) continue ;;
 773                 esac
 774                 printf '%s\n' "$pick $sha1 $message"
 775                 used="$used$sha1 "
 776                 while read -r squash action msg_prefix msg_content
 777                 do
 778                         case " $used" in
 779                         *" $squash "*) continue ;;
 780                         esac
 781                         emit=0
 782                         case "$action" in
 783                         +*)
 784                                 action="${action#+}"
 785                                 # full sha1 prefix test
 786                                 case "$msg_content" in "$sha1"*) emit=1;; esac ;;
 787                         *)
 788                                 # message prefix test
 789                                 case "$message" in "$msg_content"*) emit=1;; esac ;;
 790                         esac
 791                         if test $emit = 1; then
 792                                 real_prefix=$(echo "$msg_prefix" | sed "s/,/! /g")
 793                                 printf '%s\n' "$action $squash ${real_prefix}$msg_content"
 794                                 used="$used$squash "
 795                         fi
 796                 done <"$1.sq"
 797         done >"$1.rearranged" <"$1"
 798         cat "$1.rearranged" >"$1"
 799         rm -f "$1.sq" "$1.rearranged"
 800 }
 801
 802 # Add commands after a pick or after a squash/fixup serie
 803 # in the todo list.
 804 add_exec_commands () {
 805         {
 806                 first=t
 807                 while read -r insn rest
 808                 do
 809                         case $insn in
 810                         pick)
 811                                 test -n "$first" ||
 812                                 printf "%s" "$cmd"
 813                                 ;;
 814                         esac
 815                         printf "%s %s\n" "$insn" "$rest"
 816                         first=
 817                 done
 818                 printf "%s" "$cmd"
 819         } <"$1" >"$1.new" &&
 820         mv "$1.new" "$1"
 821 }
 822
 823 # The whole contents of this file is run by dot-sourcing it from
 824 # inside a shell function.  It used to be that "return"s we see
 825 # below were not inside any function, and expected to return
 826 # to the function that dot-sourced us.
 827 #
 828 # However, FreeBSD /bin/sh misbehaves on such a construct and
 829 # continues to run the statements that follow such a "return".
 830 # As a work-around, we introduce an extra layer of a function
 831 # here, and immediately call it after defining it.
 832 git_rebase__interactive () {
 833
 834 case "$action" in
 835 continue)
 836         # do we have anything to commit?
 837         if git diff-index --cached --quiet HEAD --
 838         then
 839                 : Nothing to commit -- skip this
 840         else
 841                 if ! test -f "$author_script"
 842                 then
 843                         gpg_sign_opt_quoted=${gpg_sign_opt:+$(git rev-parse --sq-quote "$gpg_sign_opt")}
 844                         die "You have staged changes in your working tree. If these changes are meant to be
 845 squashed into the previous commit, run:
 846
 847   git commit --amend $gpg_sign_opt_quoted
 848
 849 If they are meant to go into a new commit, run:
 850
 851   git commit $gpg_sign_opt_quoted
 852
 853 In both case, once you're done, continue with:
 854
 855   git rebase --continue
 856 "
 857                 fi
 858                 . "$author_script" ||
 859                         die "Error trying to find the author identity to amend commit"
 860                 if test -f "$amend"
 861                 then
 862                         current_head=$(git rev-parse --verify HEAD)
 863                         test "$current_head" = $(cat "$amend") ||
 864                         die "\
 865 You have uncommitted changes in your working tree. Please, commit them
 866 first and then run 'git rebase --continue' again."
 867                         do_with_author git commit --amend --no-verify -F "$msg" -e \
 868                                 ${gpg_sign_opt:+"$gpg_sign_opt"} ||
 869                                 die "Could not commit staged changes."
 870                 else
 871                         do_with_author git commit --no-verify -F "$msg" -e \
 872                                 ${gpg_sign_opt:+"$gpg_sign_opt"} ||
 873                                 die "Could not commit staged changes."
 874                 fi
 875         fi
 876
 877         record_in_rewritten "$(cat "$state_dir"/stopped-sha)"
 878
 879         require_clean_work_tree "rebase"
 880         do_rest
 881         return 0
 882         ;;
 883 skip)
 884         git rerere clear
 885
 886         do_rest
 887         return 0
 888         ;;
 889 edit-todo)
 890         git stripspace --strip-comments <"$todo" >"$todo".new
 891         mv -f "$todo".new "$todo"
 892         collapse_todo_ids
 893         append_todo_help
 894         git stripspace --comment-lines >>"$todo" <<\EOF
 895
 896 You are editing the todo file of an ongoing interactive rebase.
 897 To continue rebase after editing, run:
 898     git rebase --continue
 899
 900 EOF
 901
 902         git_sequence_editor "$todo" ||
 903                 die "Could not execute editor"
 904         expand_todo_ids
 905
 906         exit
 907         ;;
 908 esac
 909
 910 git var GIT_COMMITTER_IDENT >/dev/null ||
 911         die "You need to set your committer info first"
 912
 913 comment_for_reflog start
 914
 915 if test ! -z "$switch_to"
 916 then
 917         GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $switch_to"
 918         output git checkout "$switch_to" -- ||
 919         die "Could not checkout $switch_to"
 920
 921         comment_for_reflog start
 922 fi
 923
 924 orig_head=$(git rev-parse --verify HEAD) || die "No HEAD?"
 925 mkdir -p "$state_dir" || die "Could not create temporary $state_dir"
 926
 927 : > "$state_dir"/interactive || die "Could not mark as interactive"
 928 write_basic_state
 929 if test t = "$preserve_merges"
 930 then
 931         if test -z "$rebase_root"
 932         then
 933                 mkdir "$rewritten" &&
 934                 for c in $(git merge-base --all $orig_head $upstream)
 935                 do
 936                         echo $onto > "$rewritten"/$c ||
 937                                 die "Could not init rewritten commits"
 938                 done
 939         else
 940                 mkdir "$rewritten" &&
 941                 echo $onto > "$rewritten"/root ||
 942                         die "Could not init rewritten commits"
 943         fi
 944         # No cherry-pick because our first pass is to determine
 945         # parents to rewrite and skipping dropped commits would
 946         # prematurely end our probe
 947         merges_option=
 948 else
 949         merges_option="--no-merges --cherry-pick"
 950 fi
 951
 952 shorthead=$(git rev-parse --short $orig_head)
 953 shortonto=$(git rev-parse --short $onto)
 954 if test -z "$rebase_root"
 955         # this is now equivalent to ! -z "$upstream"
 956 then
 957         shortupstream=$(git rev-parse --short $upstream)
 958         revisions=$upstream...$orig_head
 959         shortrevisions=$shortupstream..$shorthead
 960 else
 961         revisions=$onto...$orig_head
 962         shortrevisions=$shorthead
 963 fi
 964 git rev-list $merges_option --pretty=oneline --abbrev-commit \
 965         --abbrev=7 --reverse --left-right --topo-order \
 966         $revisions ${restrict_revision+^$restrict_revision} | \
 967         sed -n "s/^>//p" |
 968 while read -r shortsha1 rest
 969 do
 970
 971         if test -z "$keep_empty" && is_empty_commit $shortsha1 && ! is_merge_commit $shortsha1
 972         then
 973                 comment_out="$comment_char "
 974         else
 975                 comment_out=
 976         fi
 977
 978         if test t != "$preserve_merges"
 979         then
 980                 printf '%s\n' "${comment_out}pick $shortsha1 $rest" >>"$todo"
 981         else
 982                 sha1=$(git rev-parse $shortsha1)
 983                 if test -z "$rebase_root"
 984                 then
 985                         preserve=t
 986                         for p in $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)
 987                         do
 988                                 if test -f "$rewritten"/$p
 989                                 then
 990                                         preserve=f
 991                                 fi
 992                         done
 993                 else
 994                         preserve=f
 995                 fi
 996                 if test f = "$preserve"
 997                 then
 998                         touch "$rewritten"/$sha1
 999                         printf '%s\n' "${comment_out}pick $shortsha1 $rest" >>"$todo"
1000                 fi
1001         fi
1002 done
1003
1004 # Watch for commits that been dropped by --cherry-pick
1005 if test t = "$preserve_merges"
1006 then
1007         mkdir "$dropped"
1008         # Save all non-cherry-picked changes
1009         git rev-list $revisions --left-right --cherry-pick | \
1010                 sed -n "s/^>//p" > "$state_dir"/not-cherry-picks
1011         # Now all commits and note which ones are missing in
1012         # not-cherry-picks and hence being dropped
1013         git rev-list $revisions |
1014         while read rev
1015         do
1016                 if test -f "$rewritten"/$rev && test "$(sane_grep "$rev" "$state_dir"/not-cherry-picks)" = ""
1017                 then
1018                         # Use -f2 because if rev-list is telling us this commit is
1019                         # not worthwhile, we don't want to track its multiple heads,
1020                         # just the history of its first-parent for others that will
1021                         # be rebasing on top of it
1022                         git rev-list --parents -1 $rev | cut -d' ' -s -f2 > "$dropped"/$rev
1023                         short=$(git rev-list -1 --abbrev-commit --abbrev=7 $rev)
1024                         sane_grep -v "^[a-z][a-z]* $short" <"$todo" > "${todo}2" ; mv "${todo}2" "$todo"
1025                         rm "$rewritten"/$rev
1026                 fi
1027         done
1028 fi
1029
1030 test -s "$todo" || echo noop >> "$todo"
1031 test -n "$autosquash" && rearrange_squash "$todo"
1032 test -n "$cmd" && add_exec_commands "$todo"
1033
1034 cat >>"$todo" <<EOF
1035
1036 $comment_char Rebase $shortrevisions onto $shortonto
1037 EOF
1038 append_todo_help
1039 git stripspace --comment-lines >>"$todo" <<\EOF
1040
1041 However, if you remove everything, the rebase will be aborted.
1042
1043 EOF
1044
1045 if test -z "$keep_empty"
1046 then
1047         printf '%s\n' "$comment_char Note that empty commits are commented out" >>"$todo"
1048 fi
1049
1050
1051 has_action "$todo" ||
1052         return 2
1053
1054 cp "$todo" "$todo".backup
1055 git_sequence_editor "$todo" ||
1056         die_abort "Could not execute editor"
1057
1058 has_action "$todo" ||
1059         return 2
1060
1061 expand_todo_ids
1062
1063 test -d "$rewritten" || test -n "$force_rebase" || skip_unnecessary_picks
1064
1065 GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $onto_name"
1066 output git checkout $onto || die_abort "could not detach HEAD"
1067 git update-ref ORIG_HEAD $orig_head
1068 do_rest
1069
1070 }
1071 # ... and then we call the whole thing.
1072 git_rebase__interactive