git-rebase--preserve-merges.sh

   1 # This shell script fragment is sourced by git-rebase to implement its
   2 # preserve-merges mode.
   3 #
   4 # Copyright (c) 2006 Johannes E. Schindelin
   5 #
   6 # The file containing rebase commands, comments, and empty lines.
   7 # This file is created by "git rebase -i" then edited by the user.  As
   8 # the lines are processed, they are removed from the front of this
   9 # file and written to the tail of $done.
  10 todo="$state_dir"/git-rebase-todo
  11
  12 # The rebase command lines that have already been processed.  A line
  13 # is moved here when it is first handled, before any associated user
  14 # actions.
  15 done="$state_dir"/done
  16
  17 # The commit message that is planned to be used for any changes that
  18 # need to be committed following a user interaction.
  19 msg="$state_dir"/message
  20
  21 # The file into which is accumulated the suggested commit message for
  22 # squash/fixup commands.  When the first of a series of squash/fixups
  23 # is seen, the file is created and the commit message from the
  24 # previous commit and from the first squash/fixup commit are written
  25 # to it.  The commit message for each subsequent squash/fixup commit
  26 # is appended to the file as it is processed.
  27 #
  28 # The first line of the file is of the form
  29 #     # This is a combination of $count commits.
  30 # where $count is the number of commits whose messages have been
  31 # written to the file so far (including the initial "pick" commit).
  32 # Each time that a commit message is processed, this line is read and
  33 # updated.  It is deleted just before the combined commit is made.
  34 squash_msg="$state_dir"/message-squash
  35
  36 # If the current series of squash/fixups has not yet included a squash
  37 # command, then this file exists and holds the commit message of the
  38 # original "pick" commit.  (If the series ends without a "squash"
  39 # command, then this can be used as the commit message of the combined
  40 # commit without opening the editor.)
  41 fixup_msg="$state_dir"/message-fixup
  42
  43 # $rewritten is the name of a directory containing files for each
  44 # commit that is reachable by at least one merge base of $head and
  45 # $upstream. They are not necessarily rewritten, but their children
  46 # might be.  This ensures that commits on merged, but otherwise
  47 # unrelated side branches are left alone. (Think "X" in the man page's
  48 # example.)
  49 rewritten="$state_dir"/rewritten
  50
  51 dropped="$state_dir"/dropped
  52
  53 end="$state_dir"/end
  54 msgnum="$state_dir"/msgnum
  55
  56 # A script to set the GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, and
  57 # GIT_AUTHOR_DATE that will be used for the commit that is currently
  58 # being rebased.
  59 author_script="$state_dir"/author-script
  60
  61 # When an "edit" rebase command is being processed, the SHA1 of the
  62 # commit to be edited is recorded in this file.  When "git rebase
  63 # --continue" is executed, if there are any staged changes then they
  64 # will be amended to the HEAD commit, but only provided the HEAD
  65 # commit is still the commit to be edited.  When any other rebase
  66 # command is processed, this file is deleted.
  67 amend="$state_dir"/amend
  68
  69 # For the post-rewrite hook, we make a list of rewritten commits and
  70 # their new sha1s.  The rewritten-pending list keeps the sha1s of
  71 # commits that have been processed, but not committed yet,
  72 # e.g. because they are waiting for a 'squash' command.
  73 rewritten_list="$state_dir"/rewritten-list
  74 rewritten_pending="$state_dir"/rewritten-pending
  75
  76 # Work around Git for Windows' Bash whose "read" does not strip CRLF
  77 # and leaves CR at the end instead.
  78 cr=$(printf "\015")
  79
  80 strategy_args=${strategy:+--strategy=$strategy}
  81 test -n "$strategy_opts" &&
  82 eval '
  83         for strategy_opt in '"$strategy_opts"'
  84         do
  85                 strategy_args="$strategy_args -X$(git rev-parse --sq-quote "${strategy_opt#--}")"
  86         done
  87 '
  88
  89 GIT_CHERRY_PICK_HELP="$resolvemsg"
  90 export GIT_CHERRY_PICK_HELP
  91
  92 comment_char=$(git config --get core.commentchar 2>/dev/null)
  93 case "$comment_char" in
  94 '' | auto)
  95         comment_char="#"
  96         ;;
  97 ?)
  98         ;;
  99 *)
 100         comment_char=$(echo "$comment_char" | cut -c1)
 101         ;;
 102 esac
 103
 104 warn () {
 105         printf '%s\n' "$*" >&2
 106 }
 107
 108 # Output the commit message for the specified commit.
 109 commit_message () {
 110         git cat-file commit "$1" | sed "1,/^$/d"
 111 }
 112
 113 orig_reflog_action="$GIT_REFLOG_ACTION"
 114
 115 comment_for_reflog () {
 116         case "$orig_reflog_action" in
 117         ''|rebase*)
 118                 GIT_REFLOG_ACTION="rebase -i ($1)"
 119                 export GIT_REFLOG_ACTION
 120                 ;;
 121         esac
 122 }
 123
 124 last_count=
 125 mark_action_done () {
 126         sed -e 1q < "$todo" >> "$done"
 127         sed -e 1d < "$todo" >> "$todo".new
 128         mv -f "$todo".new "$todo"
 129         new_count=$(( $(git stripspace --strip-comments <"$done" | wc -l) ))
 130         echo $new_count >"$msgnum"
 131         total=$(($new_count + $(git stripspace --strip-comments <"$todo" | wc -l)))
 132         echo $total >"$end"
 133         if test "$last_count" != "$new_count"
 134         then
 135                 last_count=$new_count
 136                 eval_gettext "Rebasing (\$new_count/\$total)"; printf "\r"
 137                 test -z "$verbose" || echo
 138         fi
 139 }
 140
 141 # Put the last action marked done at the beginning of the todo list
 142 # again. If there has not been an action marked done yet, leave the list of
 143 # items on the todo list unchanged.
 144 reschedule_last_action () {
 145         tail -n 1 "$done" | cat - "$todo" >"$todo".new
 146         sed -e \$d <"$done" >"$done".new
 147         mv -f "$todo".new "$todo"
 148         mv -f "$done".new "$done"
 149 }
 150
 151 append_todo_help () {
 152         gettext "
 153 Commands:
 154 p, pick <commit> = use commit
 155 r, reword <commit> = use commit, but edit the commit message
 156 e, edit <commit> = use commit, but stop for amending
 157 s, squash <commit> = use commit, but meld into previous commit
 158 f, fixup <commit> = like \"squash\", but discard this commit's log message
 159 x, exec <commit> = run command (the rest of the line) using shell
 160 d, drop <commit> = remove commit
 161 l, label <label> = label current HEAD with a name
 162 t, reset <label> = reset HEAD to a label
 163 m, merge [-C <commit> | -c <commit>] <label> [# <oneline>]
 164 .       create a merge commit using the original merge commit's
 165 .       message (or the oneline, if no original merge commit was
 166 .       specified). Use -c <commit> to reword the commit message.
 167
 168 These lines can be re-ordered; they are executed from top to bottom.
 169 " | git stripspace --comment-lines >>"$todo"
 170
 171         if test $(get_missing_commit_check_level) = error
 172         then
 173                 gettext "
 174 Do not remove any line. Use 'drop' explicitly to remove a commit.
 175 " | git stripspace --comment-lines >>"$todo"
 176         else
 177                 gettext "
 178 If you remove a line here THAT COMMIT WILL BE LOST.
 179 " | git stripspace --comment-lines >>"$todo"
 180         fi
 181 }
 182
 183 make_patch () {
 184         sha1_and_parents="$(git rev-list --parents -1 "$1")"
 185         case "$sha1_and_parents" in
 186         ?*' '?*' '?*)
 187                 git diff --cc $sha1_and_parents
 188                 ;;
 189         ?*' '?*)
 190                 git diff-tree -p "$1^!"
 191                 ;;
 192         *)
 193                 echo "Root commit"
 194                 ;;
 195         esac > "$state_dir"/patch
 196         test -f "$msg" ||
 197                 commit_message "$1" > "$msg"
 198         test -f "$author_script" ||
 199                 get_author_ident_from_commit "$1" > "$author_script"
 200 }
 201
 202 die_with_patch () {
 203         echo "$1" > "$state_dir"/stopped-sha
 204         git update-ref REBASE_HEAD "$1"
 205         make_patch "$1"
 206         die "$2"
 207 }
 208
 209 exit_with_patch () {
 210         echo "$1" > "$state_dir"/stopped-sha
 211         git update-ref REBASE_HEAD "$1"
 212         make_patch $1
 213         git rev-parse --verify HEAD > "$amend"
 214         gpg_sign_opt_quoted=${gpg_sign_opt:+$(git rev-parse --sq-quote "$gpg_sign_opt")}
 215         warn "$(eval_gettext "\
 216 You can amend the commit now, with
 217
 218         git commit --amend \$gpg_sign_opt_quoted
 219
 220 Once you are satisfied with your changes, run
 221
 222         git rebase --continue")"
 223         warn
 224         exit $2
 225 }
 226
 227 die_abort () {
 228         apply_autostash
 229         rm -rf "$state_dir"
 230         die "$1"
 231 }
 232
 233 has_action () {
 234         test -n "$(git stripspace --strip-comments <"$1")"
 235 }
 236
 237 is_empty_commit() {
 238         tree=$(git rev-parse -q --verify "$1"^{tree} 2>/dev/null) || {
 239                 sha1=$1
 240                 die "$(eval_gettext "\$sha1: not a commit that can be picked")"
 241         }
 242         ptree=$(git rev-parse -q --verify "$1"^^{tree} 2>/dev/null) ||
 243                 ptree=4b825dc642cb6eb9a060e54bf8d69288fbee4904
 244         test "$tree" = "$ptree"
 245 }
 246
 247 is_merge_commit()
 248 {
 249         git rev-parse --verify --quiet "$1"^2 >/dev/null 2>&1
 250 }
 251
 252 # Run command with GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, and
 253 # GIT_AUTHOR_DATE exported from the current environment.
 254 do_with_author () {
 255         (
 256                 export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_AUTHOR_DATE
 257                 "$@"
 258         )
 259 }
 260
 261 git_sequence_editor () {
 262         if test -z "$GIT_SEQUENCE_EDITOR"
 263         then
 264                 GIT_SEQUENCE_EDITOR="$(git config sequence.editor)"
 265                 if [ -z "$GIT_SEQUENCE_EDITOR" ]
 266                 then
 267                         GIT_SEQUENCE_EDITOR="$(git var GIT_EDITOR)" || return $?
 268                 fi
 269         fi
 270
 271         eval "$GIT_SEQUENCE_EDITOR" '"$@"'
 272 }
 273
 274 pick_one () {
 275         ff=--ff
 276
 277         case "$1" in -n) sha1=$2; ff= ;; *) sha1=$1 ;; esac
 278         case "$force_rebase" in '') ;; ?*) ff= ;; esac
 279         output git rev-parse --verify $sha1 || die "$(eval_gettext "Invalid commit name: \$sha1")"
 280
 281         if is_empty_commit "$sha1"
 282         then
 283                 empty_args="--allow-empty"
 284         fi
 285
 286         pick_one_preserving_merges "$@"
 287 }
 288
 289 pick_one_preserving_merges () {
 290         fast_forward=t
 291         case "$1" in
 292         -n)
 293                 fast_forward=f
 294                 sha1=$2
 295                 ;;
 296         *)
 297                 sha1=$1
 298                 ;;
 299         esac
 300         sha1=$(git rev-parse $sha1)
 301
 302         if test -f "$state_dir"/current-commit && test "$fast_forward" = t
 303         then
 304                 while read current_commit
 305                 do
 306                         git rev-parse HEAD > "$rewritten"/$current_commit
 307                 done <"$state_dir"/current-commit
 308                 rm "$state_dir"/current-commit ||
 309                         die "$(gettext "Cannot write current commit's replacement sha1")"
 310         fi
 311
 312         echo $sha1 >> "$state_dir"/current-commit
 313
 314         # rewrite parents; if none were rewritten, we can fast-forward.
 315         new_parents=
 316         pend=" $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)"
 317         if test "$pend" = " "
 318         then
 319                 pend=" root"
 320         fi
 321         while [ "$pend" != "" ]
 322         do
 323                 p=$(expr "$pend" : ' \([^ ]*\)')
 324                 pend="${pend# $p}"
 325
 326                 if test -f "$rewritten"/$p
 327                 then
 328                         new_p=$(cat "$rewritten"/$p)
 329
 330                         # If the todo reordered commits, and our parent is marked for
 331                         # rewriting, but hasn't been gotten to yet, assume the user meant to
 332                         # drop it on top of the current HEAD
 333                         if test -z "$new_p"
 334                         then
 335                                 new_p=$(git rev-parse HEAD)
 336                         fi
 337
 338                         test $p != $new_p && fast_forward=f
 339                         case "$new_parents" in
 340                         *$new_p*)
 341                                 ;; # do nothing; that parent is already there
 342                         *)
 343                                 new_parents="$new_parents $new_p"
 344                                 ;;
 345                         esac
 346                 else
 347                         if test -f "$dropped"/$p
 348                         then
 349                                 fast_forward=f
 350                                 replacement="$(cat "$dropped"/$p)"
 351                                 test -z "$replacement" && replacement=root
 352                                 pend=" $replacement$pend"
 353                         else
 354                                 new_parents="$new_parents $p"
 355                         fi
 356                 fi
 357         done
 358         case $fast_forward in
 359         t)
 360                 output warn "$(eval_gettext "Fast-forward to \$sha1")"
 361                 output git reset --hard $sha1 ||
 362                         die "$(eval_gettext "Cannot fast-forward to \$sha1")"
 363                 ;;
 364         f)
 365                 first_parent=$(expr "$new_parents" : ' \([^ ]*\)')
 366
 367                 if [ "$1" != "-n" ]
 368                 then
 369                         # detach HEAD to current parent
 370                         output git checkout $first_parent 2> /dev/null ||
 371                                 die "$(eval_gettext "Cannot move HEAD to \$first_parent")"
 372                 fi
 373
 374                 case "$new_parents" in
 375                 ' '*' '*)
 376                         test "a$1" = a-n && die "$(eval_gettext "Refusing to squash a merge: \$sha1")"
 377
 378                         # redo merge
 379                         author_script_content=$(get_author_ident_from_commit $sha1)
 380                         eval "$author_script_content"
 381                         msg_content="$(commit_message $sha1)"
 382                         # No point in merging the first parent, that's HEAD
 383                         new_parents=${new_parents# $first_parent}
 384                         merge_args="--no-log --no-ff"
 385                         if ! do_with_author output eval \
 386                                 git merge ${gpg_sign_opt:+$(git rev-parse \
 387                                         --sq-quote "$gpg_sign_opt")} \
 388                                 $allow_rerere_autoupdate "$merge_args" \
 389                                 "$strategy_args" \
 390                                 -m "$(git rev-parse --sq-quote "$msg_content")" \
 391                                 "$new_parents"
 392                         then
 393                                 printf "%s\n" "$msg_content" > "$GIT_DIR"/MERGE_MSG
 394                                 die_with_patch $sha1 "$(eval_gettext "Error redoing merge \$sha1")"
 395                         fi
 396                         echo "$sha1 $(git rev-parse HEAD^0)" >> "$rewritten_list"
 397                         ;;
 398                 *)
 399                         output eval git cherry-pick $allow_rerere_autoupdate \
 400                                 $allow_empty_message \
 401                                 ${gpg_sign_opt:+$(git rev-parse --sq-quote "$gpg_sign_opt")} \
 402                                 "$strategy_args" "$@" ||
 403                                 die_with_patch $sha1 "$(eval_gettext "Could not pick \$sha1")"
 404                         ;;
 405                 esac
 406                 ;;
 407         esac
 408 }
 409
 410 this_nth_commit_message () {
 411         n=$1
 412         eval_gettext "This is the commit message #\${n}:"
 413 }
 414
 415 skip_nth_commit_message () {
 416         n=$1
 417         eval_gettext "The commit message #\${n} will be skipped:"
 418 }
 419
 420 update_squash_messages () {
 421         if test -f "$squash_msg"; then
 422                 mv "$squash_msg" "$squash_msg".bak || exit
 423                 count=$(($(sed -n \
 424                         -e "1s/^$comment_char[^0-9]*\([0-9][0-9]*\).*/\1/p" \
 425                         -e "q" < "$squash_msg".bak)+1))
 426                 {
 427                         printf '%s\n' "$comment_char $(eval_ngettext \
 428                                 "This is a combination of \$count commit." \
 429                                 "This is a combination of \$count commits." \
 430                                 $count)"
 431                         sed -e 1d -e '2,/^./{
 432                                 /^$/d
 433                         }' <"$squash_msg".bak
 434                 } >"$squash_msg"
 435         else
 436                 commit_message HEAD >"$fixup_msg" ||
 437                 die "$(eval_gettext "Cannot write \$fixup_msg")"
 438                 count=2
 439                 {
 440                         printf '%s\n' "$comment_char $(gettext "This is a combination of 2 commits.")"
 441                         printf '%s\n' "$comment_char $(gettext "This is the 1st commit message:")"
 442                         echo
 443                         cat "$fixup_msg"
 444                 } >"$squash_msg"
 445         fi
 446         case $1 in
 447         squash)
 448                 rm -f "$fixup_msg"
 449                 echo
 450                 printf '%s\n' "$comment_char $(this_nth_commit_message $count)"
 451                 echo
 452                 commit_message $2
 453                 ;;
 454         fixup)
 455                 echo
 456                 printf '%s\n' "$comment_char $(skip_nth_commit_message $count)"
 457                 echo
 458                 # Change the space after the comment character to TAB:
 459                 commit_message $2 | git stripspace --comment-lines | sed -e 's/ /       /'
 460                 ;;
 461         esac >>"$squash_msg"
 462 }
 463
 464 peek_next_command () {
 465         git stripspace --strip-comments <"$todo" | sed -n -e 's/ .*//p' -e q
 466 }
 467
 468 # A squash/fixup has failed.  Prepare the long version of the squash
 469 # commit message, then die_with_patch.  This code path requires the
 470 # user to edit the combined commit message for all commits that have
 471 # been squashed/fixedup so far.  So also erase the old squash
 472 # messages, effectively causing the combined commit to be used as the
 473 # new basis for any further squash/fixups.  Args: sha1 rest
 474 die_failed_squash() {
 475         sha1=$1
 476         rest=$2
 477         mv "$squash_msg" "$msg" || exit
 478         rm -f "$fixup_msg"
 479         cp "$msg" "$GIT_DIR"/MERGE_MSG || exit
 480         warn
 481         warn "$(eval_gettext "Could not apply \$sha1... \$rest")"
 482         die_with_patch $sha1 ""
 483 }
 484
 485 flush_rewritten_pending() {
 486         test -s "$rewritten_pending" || return
 487         newsha1="$(git rev-parse HEAD^0)"
 488         sed "s/$/ $newsha1/" < "$rewritten_pending" >> "$rewritten_list"
 489         rm -f "$rewritten_pending"
 490 }
 491
 492 record_in_rewritten() {
 493         oldsha1="$(git rev-parse $1)"
 494         echo "$oldsha1" >> "$rewritten_pending"
 495
 496         case "$(peek_next_command)" in
 497         squash|s|fixup|f)
 498                 ;;
 499         *)
 500                 flush_rewritten_pending
 501                 ;;
 502         esac
 503 }
 504
 505 do_pick () {
 506         sha1=$1
 507         rest=$2
 508         if test "$(git rev-parse HEAD)" = "$squash_onto"
 509         then
 510                 # Set the correct commit message and author info on the
 511                 # sentinel root before cherry-picking the original changes
 512                 # without committing (-n).  Finally, update the sentinel again
 513                 # to include these changes.  If the cherry-pick results in a
 514                 # conflict, this means our behaviour is similar to a standard
 515                 # failed cherry-pick during rebase, with a dirty index to
 516                 # resolve before manually running git commit --amend then git
 517                 # rebase --continue.
 518                 git commit --allow-empty --allow-empty-message --amend \
 519                            --no-post-rewrite -n -q -C $sha1 $signoff &&
 520                         pick_one -n $sha1 &&
 521                         git commit --allow-empty --allow-empty-message \
 522                                    --amend --no-post-rewrite -n -q -C $sha1 $signoff \
 523                                    ${gpg_sign_opt:+"$gpg_sign_opt"} ||
 524                                    die_with_patch $sha1 "$(eval_gettext "Could not apply \$sha1... \$rest")"
 525         else
 526                 pick_one $sha1 ||
 527                         die_with_patch $sha1 "$(eval_gettext "Could not apply \$sha1... \$rest")"
 528         fi
 529 }
 530
 531 do_next () {
 532         rm -f "$msg" "$author_script" "$amend" "$state_dir"/stopped-sha || exit
 533         read -r command sha1 rest < "$todo"
 534         case "$command" in
 535         "$comment_char"*|''|noop|drop|d)
 536                 mark_action_done
 537                 ;;
 538         "$cr")
 539                 # Work around CR left by "read" (e.g. with Git for Windows' Bash).
 540                 mark_action_done
 541                 ;;
 542         pick|p)
 543                 comment_for_reflog pick
 544
 545                 mark_action_done
 546                 do_pick $sha1 "$rest"
 547                 record_in_rewritten $sha1
 548                 ;;
 549         reword|r)
 550                 comment_for_reflog reword
 551
 552                 mark_action_done
 553                 do_pick $sha1 "$rest"
 554                 git commit --amend --no-post-rewrite ${gpg_sign_opt:+"$gpg_sign_opt"} \
 555                         $allow_empty_message || {
 556                         warn "$(eval_gettext "\
 557 Could not amend commit after successfully picking \$sha1... \$rest
 558 This is most likely due to an empty commit message, or the pre-commit hook
 559 failed. If the pre-commit hook failed, you may need to resolve the issue before
 560 you are able to reword the commit.")"
 561                         exit_with_patch $sha1 1
 562                 }
 563                 record_in_rewritten $sha1
 564                 ;;
 565         edit|e)
 566                 comment_for_reflog edit
 567
 568                 mark_action_done
 569                 do_pick $sha1 "$rest"
 570                 sha1_abbrev=$(git rev-parse --short $sha1)
 571                 warn "$(eval_gettext "Stopped at \$sha1_abbrev... \$rest")"
 572                 exit_with_patch $sha1 0
 573                 ;;
 574         squash|s|fixup|f)
 575                 case "$command" in
 576                 squash|s)
 577                         squash_style=squash
 578                         ;;
 579                 fixup|f)
 580                         squash_style=fixup
 581                         ;;
 582                 esac
 583                 comment_for_reflog $squash_style
 584
 585                 test -f "$done" && has_action "$done" ||
 586                         die "$(eval_gettext "Cannot '\$squash_style' without a previous commit")"
 587
 588                 mark_action_done
 589                 update_squash_messages $squash_style $sha1
 590                 author_script_content=$(get_author_ident_from_commit HEAD)
 591                 echo "$author_script_content" > "$author_script"
 592                 eval "$author_script_content"
 593                 if ! pick_one -n $sha1
 594                 then
 595                         git rev-parse --verify HEAD >"$amend"
 596                         die_failed_squash $sha1 "$rest"
 597                 fi
 598                 case "$(peek_next_command)" in
 599                 squash|s|fixup|f)
 600                         # This is an intermediate commit; its message will only be
 601                         # used in case of trouble.  So use the long version:
 602                         do_with_author output git commit --amend --no-verify -F "$squash_msg" \
 603                                 ${gpg_sign_opt:+"$gpg_sign_opt"} $allow_empty_message ||
 604                                 die_failed_squash $sha1 "$rest"
 605                         ;;
 606                 *)
 607                         # This is the final command of this squash/fixup group
 608                         if test -f "$fixup_msg"
 609                         then
 610                                 do_with_author git commit --amend --no-verify -F "$fixup_msg" \
 611                                         ${gpg_sign_opt:+"$gpg_sign_opt"} $allow_empty_message ||
 612                                         die_failed_squash $sha1 "$rest"
 613                         else
 614                                 cp "$squash_msg" "$GIT_DIR"/SQUASH_MSG || exit
 615                                 rm -f "$GIT_DIR"/MERGE_MSG
 616                                 do_with_author git commit --amend --no-verify -F "$GIT_DIR"/SQUASH_MSG -e \
 617                                         ${gpg_sign_opt:+"$gpg_sign_opt"} $allow_empty_message ||
 618                                         die_failed_squash $sha1 "$rest"
 619                         fi
 620                         rm -f "$squash_msg" "$fixup_msg"
 621                         ;;
 622                 esac
 623                 record_in_rewritten $sha1
 624                 ;;
 625         x|"exec")
 626                 read -r command rest < "$todo"
 627                 mark_action_done
 628                 eval_gettextln "Executing: \$rest"
 629                 "${SHELL:-@SHELL_PATH@}" -c "$rest" # Actual execution
 630                 status=$?
 631                 # Run in subshell because require_clean_work_tree can die.
 632                 dirty=f
 633                 (require_clean_work_tree "rebase" 2>/dev/null) || dirty=t
 634                 if test "$status" -ne 0
 635                 then
 636                         warn "$(eval_gettext "Execution failed: \$rest")"
 637                         test "$dirty" = f ||
 638                                 warn "$(gettext "and made changes to the index and/or the working tree")"
 639
 640                         warn "$(gettext "\
 641 You can fix the problem, and then run
 642
 643         git rebase --continue")"
 644                         warn
 645                         if test $status -eq 127         # command not found
 646                         then
 647                                 status=1
 648                         fi
 649                         exit "$status"
 650                 elif test "$dirty" = t
 651                 then
 652                         # TRANSLATORS: after these lines is a command to be issued by the user
 653                         warn "$(eval_gettext "\
 654 Execution succeeded: \$rest
 655 but left changes to the index and/or the working tree
 656 Commit or stash your changes, and then run
 657
 658         git rebase --continue")"
 659                         warn
 660                         exit 1
 661                 fi
 662                 ;;
 663         *)
 664                 warn "$(eval_gettext "Unknown command: \$command \$sha1 \$rest")"
 665                 fixtodo="$(gettext "Please fix this using 'git rebase --edit-todo'.")"
 666                 if git rev-parse --verify -q "$sha1" >/dev/null
 667                 then
 668                         die_with_patch $sha1 "$fixtodo"
 669                 else
 670                         die "$fixtodo"
 671                 fi
 672                 ;;
 673         esac
 674         test -s "$todo" && return
 675
 676         comment_for_reflog finish &&
 677         newhead=$(git rev-parse HEAD) &&
 678         case $head_name in
 679         refs/*)
 680                 message="$GIT_REFLOG_ACTION: $head_name onto $onto" &&
 681                 git update-ref -m "$message" $head_name $newhead $orig_head &&
 682                 git symbolic-ref \
 683                   -m "$GIT_REFLOG_ACTION: returning to $head_name" \
 684                   HEAD $head_name
 685                 ;;
 686         esac && {
 687                 test ! -f "$state_dir"/verbose ||
 688                         git diff-tree --stat $orig_head..HEAD
 689         } &&
 690         {
 691                 test -s "$rewritten_list" &&
 692                 git notes copy --for-rewrite=rebase < "$rewritten_list" ||
 693                 true # we don't care if this copying failed
 694         } &&
 695         hook="$(git rev-parse --git-path hooks/post-rewrite)"
 696         if test -x "$hook" && test -s "$rewritten_list"; then
 697                 "$hook" rebase < "$rewritten_list"
 698                 true # we don't care if this hook failed
 699         fi &&
 700                 warn "$(eval_gettext "Successfully rebased and updated \$head_name.")"
 701
 702         return 1 # not failure; just to break the do_rest loop
 703 }
 704
 705 # can only return 0, when the infinite loop breaks
 706 do_rest () {
 707         while :
 708         do
 709                 do_next || break
 710         done
 711 }
 712
 713 expand_todo_ids() {
 714         git rebase--interactive --expand-ids
 715 }
 716
 717 collapse_todo_ids() {
 718         git rebase--interactive --shorten-ids
 719 }
 720
 721 # Switch to the branch in $into and notify it in the reflog
 722 checkout_onto () {
 723         GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $onto_name"
 724         output git checkout $onto || die_abort "$(gettext "could not detach HEAD")"
 725         git update-ref ORIG_HEAD $orig_head
 726 }
 727
 728 get_missing_commit_check_level () {
 729         check_level=$(git config --get rebase.missingCommitsCheck)
 730         check_level=${check_level:-ignore}
 731         # Don't be case sensitive
 732         printf '%s' "$check_level" | tr 'A-Z' 'a-z'
 733 }
 734
 735 # Initiate an action. If the cannot be any
 736 # further action it  may exec a command
 737 # or exit and not return.
 738 #
 739 # TODO: Consider a cleaner return model so it
 740 # never exits and always return 0 if process
 741 # is complete.
 742 #
 743 # Parameter 1 is the action to initiate.
 744 #
 745 # Returns 0 if the action was able to complete
 746 # and if 1 if further processing is required.
 747 initiate_action () {
 748         case "$1" in
 749         continue)
 750                 # do we have anything to commit?
 751                 if git diff-index --cached --quiet HEAD --
 752                 then
 753                         # Nothing to commit -- skip this commit
 754
 755                         test ! -f "$GIT_DIR"/CHERRY_PICK_HEAD ||
 756                         rm "$GIT_DIR"/CHERRY_PICK_HEAD ||
 757                         die "$(gettext "Could not remove CHERRY_PICK_HEAD")"
 758                 else
 759                         if ! test -f "$author_script"
 760                         then
 761                                 gpg_sign_opt_quoted=${gpg_sign_opt:+$(git rev-parse --sq-quote "$gpg_sign_opt")}
 762                                 die "$(eval_gettext "\
 763 You have staged changes in your working tree.
 764 If these changes are meant to be
 765 squashed into the previous commit, run:
 766
 767   git commit --amend \$gpg_sign_opt_quoted
 768
 769 If they are meant to go into a new commit, run:
 770
 771   git commit \$gpg_sign_opt_quoted
 772
 773 In both cases, once you're done, continue with:
 774
 775   git rebase --continue
 776 ")"
 777                         fi
 778                         . "$author_script" ||
 779                                 die "$(gettext "Error trying to find the author identity to amend commit")"
 780                         if test -f "$amend"
 781                         then
 782                                 current_head=$(git rev-parse --verify HEAD)
 783                                 test "$current_head" = $(cat "$amend") ||
 784                                 die "$(gettext "\
 785 You have uncommitted changes in your working tree. Please commit them
 786 first and then run 'git rebase --continue' again.")"
 787                                 do_with_author git commit --amend --no-verify -F "$msg" -e \
 788                                         ${gpg_sign_opt:+"$gpg_sign_opt"} $allow_empty_message ||
 789                                         die "$(gettext "Could not commit staged changes.")"
 790                         else
 791                                 do_with_author git commit --no-verify -F "$msg" -e \
 792                                         ${gpg_sign_opt:+"$gpg_sign_opt"} $allow_empty_message ||
 793                                         die "$(gettext "Could not commit staged changes.")"
 794                         fi
 795                 fi
 796
 797                 if test -r "$state_dir"/stopped-sha
 798                 then
 799                         record_in_rewritten "$(cat "$state_dir"/stopped-sha)"
 800                 fi
 801
 802                 require_clean_work_tree "rebase"
 803                 do_rest
 804                 return 0
 805                 ;;
 806         skip)
 807                 git rerere clear
 808                 do_rest
 809                 return 0
 810                 ;;
 811         edit-todo)
 812                 git stripspace --strip-comments <"$todo" >"$todo".new
 813                 mv -f "$todo".new "$todo"
 814                 collapse_todo_ids
 815                 append_todo_help
 816                 gettext "
 817 You are editing the todo file of an ongoing interactive rebase.
 818 To continue rebase after editing, run:
 819     git rebase --continue
 820
 821 " | git stripspace --comment-lines >>"$todo"
 822
 823                 git_sequence_editor "$todo" ||
 824                         die "$(gettext "Could not execute editor")"
 825                 expand_todo_ids
 826
 827                 exit
 828                 ;;
 829         show-current-patch)
 830                 exec git show REBASE_HEAD --
 831                 ;;
 832         *)
 833                 return 1 # continue
 834                 ;;
 835         esac
 836 }
 837
 838 setup_reflog_action () {
 839         comment_for_reflog start
 840
 841         if test ! -z "$switch_to"
 842         then
 843                 GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $switch_to"
 844                 output git checkout "$switch_to" -- ||
 845                         die "$(eval_gettext "Could not checkout \$switch_to")"
 846
 847                 comment_for_reflog start
 848         fi
 849 }
 850
 851 init_basic_state () {
 852         orig_head=$(git rev-parse --verify HEAD) || die "$(gettext "No HEAD?")"
 853         mkdir -p "$state_dir" || die "$(eval_gettext "Could not create temporary \$state_dir")"
 854         rm -f "$(git rev-parse --git-path REBASE_HEAD)"
 855
 856         : > "$state_dir"/interactive || die "$(gettext "Could not mark as interactive")"
 857         write_basic_state
 858 }
 859
 860 init_revisions_and_shortrevisions () {
 861         shorthead=$(git rev-parse --short $orig_head)
 862         shortonto=$(git rev-parse --short $onto)
 863         if test -z "$rebase_root"
 864                 # this is now equivalent to ! -z "$upstream"
 865         then
 866                 shortupstream=$(git rev-parse --short $upstream)
 867                 revisions=$upstream...$orig_head
 868                 shortrevisions=$shortupstream..$shorthead
 869         else
 870                 revisions=$onto...$orig_head
 871                 shortrevisions=$shorthead
 872                 test -z "$squash_onto" ||
 873                 echo "$squash_onto" >"$state_dir"/squash-onto
 874         fi
 875 }
 876
 877 complete_action() {
 878         test -s "$todo" || echo noop >> "$todo"
 879         test -z "$autosquash" || git rebase--interactive --rearrange-squash || exit
 880         test -n "$cmd" && git rebase--interactive --add-exec-commands --cmd "$cmd"
 881
 882         todocount=$(git stripspace --strip-comments <"$todo" | wc -l)
 883         todocount=${todocount##* }
 884
 885 cat >>"$todo" <<EOF
 886
 887 $comment_char $(eval_ngettext \
 888         "Rebase \$shortrevisions onto \$shortonto (\$todocount command)" \
 889         "Rebase \$shortrevisions onto \$shortonto (\$todocount commands)" \
 890         "$todocount")
 891 EOF
 892         append_todo_help
 893         gettext "
 894 However, if you remove everything, the rebase will be aborted.
 895
 896 " | git stripspace --comment-lines >>"$todo"
 897
 898         if test -z "$keep_empty"
 899         then
 900                 printf '%s\n' "$comment_char $(gettext "Note that empty commits are commented out")" >>"$todo"
 901         fi
 902
 903
 904         has_action "$todo" ||
 905                 return 2
 906
 907         cp "$todo" "$todo".backup
 908         collapse_todo_ids
 909         git_sequence_editor "$todo" ||
 910                 die_abort "$(gettext "Could not execute editor")"
 911
 912         has_action "$todo" ||
 913                 return 2
 914
 915         git rebase--interactive --check-todo-list || {
 916                 ret=$?
 917                 checkout_onto
 918                 exit $ret
 919         }
 920
 921         expand_todo_ids
 922         checkout_onto
 923         do_rest
 924 }
 925
 926 git_rebase__preserve_merges () {
 927         initiate_action "$action"
 928         ret=$?
 929         if test $ret = 0; then
 930                 return 0
 931         fi
 932
 933         setup_reflog_action
 934         init_basic_state
 935
 936         if test -z "$rebase_root"
 937         then
 938                 mkdir "$rewritten" &&
 939                 for c in $(git merge-base --all $orig_head $upstream)
 940                 do
 941                         echo $onto > "$rewritten"/$c ||
 942                                 die "$(gettext "Could not init rewritten commits")"
 943                 done
 944         else
 945                 mkdir "$rewritten" &&
 946                 echo $onto > "$rewritten"/root ||
 947                         die "$(gettext "Could not init rewritten commits")"
 948         fi
 949
 950         init_revisions_and_shortrevisions
 951
 952         format=$(git config --get rebase.instructionFormat)
 953         # the 'rev-list .. | sed' requires %m to parse; the instruction requires %H to parse
 954         git rev-list --format="%m%H ${format:-%s}" \
 955                 --reverse --left-right --topo-order \
 956                 $revisions ${restrict_revision+^$restrict_revision} | \
 957                 sed -n "s/^>//p" |
 958         while read -r sha1 rest
 959         do
 960                 if test -z "$keep_empty" && is_empty_commit $sha1 && ! is_merge_commit $sha1
 961                 then
 962                         comment_out="$comment_char "
 963                 else
 964                         comment_out=
 965                 fi
 966
 967                 if test -z "$rebase_root"
 968                 then
 969                         preserve=t
 970                         for p in $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)
 971                         do
 972                                 if test -f "$rewritten"/$p
 973                                 then
 974                                         preserve=f
 975                                 fi
 976                         done
 977                 else
 978                         preserve=f
 979                 fi
 980                 if test f = "$preserve"
 981                 then
 982                         touch "$rewritten"/$sha1
 983                         printf '%s\n' "${comment_out}pick $sha1 $rest" >>"$todo"
 984                 fi
 985         done
 986
 987         # Watch for commits that been dropped by --cherry-pick
 988         mkdir "$dropped"
 989         # Save all non-cherry-picked changes
 990         git rev-list $revisions --left-right --cherry-pick | \
 991                 sed -n "s/^>//p" > "$state_dir"/not-cherry-picks
 992         # Now all commits and note which ones are missing in
 993         # not-cherry-picks and hence being dropped
 994         git rev-list $revisions |
 995         while read rev
 996         do
 997                 if test -f "$rewritten"/$rev &&
 998                    ! sane_grep "$rev" "$state_dir"/not-cherry-picks >/dev/null
 999                 then
1000                         # Use -f2 because if rev-list is telling us this commit is
1001                         # not worthwhile, we don't want to track its multiple heads,
1002                         # just the history of its first-parent for others that will
1003                         # be rebasing on top of it
1004                         git rev-list --parents -1 $rev | cut -d' ' -s -f2 > "$dropped"/$rev
1005                         sha1=$(git rev-list -1 $rev)
1006                         sane_grep -v "^[a-z][a-z]* $sha1" <"$todo" > "${todo}2" ; mv "${todo}2" "$todo"
1007                         rm "$rewritten"/$rev
1008                 fi
1009         done
1010
1011         complete_action
1012 }