git-rebase--interactive.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2006 Johannes E. Schindelin
   4
   5 # SHORT DESCRIPTION
   6 #
   7 # This script makes it easy to fix up commits in the middle of a series,
   8 # and rearrange commits.
   9 #
  10 # The original idea comes from Eric W. Biederman, in
  11 # http://article.gmane.org/gmane.comp.version-control.git/22407
  12
  13 OPTIONS_KEEPDASHDASH=
  14 OPTIONS_SPEC="\
  15 git-rebase [-i] [options] [--] <upstream> [<branch>]
  16 git-rebase [-i] (--continue | --abort | --skip)
  17 --
  18  Available options are
  19 v,verbose          display a diffstat of what changed upstream
  20 onto=              rebase onto given branch instead of upstream
  21 p,preserve-merges  try to recreate merges instead of ignoring them
  22 s,strategy=        use the given merge strategy
  23 m,merge            always used (no-op)
  24 i,interactive      always used (no-op)
  25  Actions:
  26 continue           continue rebasing process
  27 abort              abort rebasing process and restore original branch
  28 skip               skip current patch and continue rebasing process
  29 "
  30
  31 . git-sh-setup
  32 require_work_tree
  33
  34 DOTEST="$GIT_DIR/rebase-merge"
  35 TODO="$DOTEST"/git-rebase-todo
  36 DONE="$DOTEST"/done
  37 MSG="$DOTEST"/message
  38 SQUASH_MSG="$DOTEST"/message-squash
  39 REWRITTEN="$DOTEST"/rewritten
  40 PRESERVE_MERGES=
  41 STRATEGY=
  42 ONTO=
  43 VERBOSE=
  44
  45 GIT_CHERRY_PICK_HELP="  After resolving the conflicts,
  46 mark the corrected paths with 'git add <paths>', and
  47 run 'git rebase --continue'"
  48 export GIT_CHERRY_PICK_HELP
  49
  50 warn () {
  51         echo "$*" >&2
  52 }
  53
  54 output () {
  55         case "$VERBOSE" in
  56         '')
  57                 output=$("$@" 2>&1 )
  58                 status=$?
  59                 test $status != 0 && printf "%s\n" "$output"
  60                 return $status
  61                 ;;
  62         *)
  63                 "$@"
  64                 ;;
  65         esac
  66 }
  67
  68 require_clean_work_tree () {
  69         # test if working tree is dirty
  70         git rev-parse --verify HEAD > /dev/null &&
  71         git update-index --ignore-submodules --refresh &&
  72         git diff-files --quiet --ignore-submodules &&
  73         git diff-index --cached --quiet HEAD --ignore-submodules -- ||
  74         die "Working tree is dirty"
  75 }
  76
  77 ORIG_REFLOG_ACTION="$GIT_REFLOG_ACTION"
  78
  79 comment_for_reflog () {
  80         case "$ORIG_REFLOG_ACTION" in
  81         ''|rebase*)
  82                 GIT_REFLOG_ACTION="rebase -i ($1)"
  83                 export GIT_REFLOG_ACTION
  84                 ;;
  85         esac
  86 }
  87
  88 last_count=
  89 mark_action_done () {
  90         sed -e 1q < "$TODO" >> "$DONE"
  91         sed -e 1d < "$TODO" >> "$TODO".new
  92         mv -f "$TODO".new "$TODO"
  93         count=$(grep -c '^[^#]' < "$DONE")
  94         total=$(($count+$(grep -c '^[^#]' < "$TODO")))
  95         if test "$last_count" != "$count"
  96         then
  97                 last_count=$count
  98                 printf "Rebasing (%d/%d)\r" $count $total
  99                 test -z "$VERBOSE" || echo
 100         fi
 101 }
 102
 103 make_patch () {
 104         parent_sha1=$(git rev-parse --verify "$1"^) ||
 105                 die "Cannot get patch for $1^"
 106         git diff-tree -p "$parent_sha1".."$1" > "$DOTEST"/patch
 107         test -f "$DOTEST"/message ||
 108                 git cat-file commit "$1" | sed "1,/^$/d" > "$DOTEST"/message
 109         test -f "$DOTEST"/author-script ||
 110                 get_author_ident_from_commit "$1" > "$DOTEST"/author-script
 111 }
 112
 113 die_with_patch () {
 114         make_patch "$1"
 115         git rerere
 116         die "$2"
 117 }
 118
 119 die_abort () {
 120         rm -rf "$DOTEST"
 121         die "$1"
 122 }
 123
 124 has_action () {
 125         grep '^[^#]' "$1" >/dev/null
 126 }
 127
 128 pick_one () {
 129         no_ff=
 130         case "$1" in -n) sha1=$2; no_ff=t ;; *) sha1=$1 ;; esac
 131         output git rev-parse --verify $sha1 || die "Invalid commit name: $sha1"
 132         test -d "$REWRITTEN" &&
 133                 pick_one_preserving_merges "$@" && return
 134         parent_sha1=$(git rev-parse --verify $sha1^) ||
 135                 die "Could not get the parent of $sha1"
 136         current_sha1=$(git rev-parse --verify HEAD)
 137         if test "$no_ff$current_sha1" = "$parent_sha1"; then
 138                 output git reset --hard $sha1
 139                 test "a$1" = a-n && output git reset --soft $current_sha1
 140                 sha1=$(git rev-parse --short $sha1)
 141                 output warn Fast forward to $sha1
 142         else
 143                 output git cherry-pick "$@"
 144         fi
 145 }
 146
 147 pick_one_preserving_merges () {
 148         case "$1" in -n) sha1=$2 ;; *) sha1=$1 ;; esac
 149         sha1=$(git rev-parse $sha1)
 150
 151         if test -f "$DOTEST"/current-commit
 152         then
 153                 current_commit=$(cat "$DOTEST"/current-commit) &&
 154                 git rev-parse HEAD > "$REWRITTEN"/$current_commit &&
 155                 rm "$DOTEST"/current-commit ||
 156                 die "Cannot write current commit's replacement sha1"
 157         fi
 158
 159         # rewrite parents; if none were rewritten, we can fast-forward.
 160         fast_forward=t
 161         preserve=t
 162         new_parents=
 163         for p in $(git rev-list --parents -1 $sha1 | cut -d' ' -f2-)
 164         do
 165                 if test -f "$REWRITTEN"/$p
 166                 then
 167                         preserve=f
 168                         new_p=$(cat "$REWRITTEN"/$p)
 169                         test $p != $new_p && fast_forward=f
 170                         case "$new_parents" in
 171                         *$new_p*)
 172                                 ;; # do nothing; that parent is already there
 173                         *)
 174                                 new_parents="$new_parents $new_p"
 175                                 ;;
 176                         esac
 177                 else
 178                         new_parents="$new_parents $p"
 179                 fi
 180         done
 181         case $fast_forward in
 182         t)
 183                 output warn "Fast forward to $sha1"
 184                 test $preserve = f || echo $sha1 > "$REWRITTEN"/$sha1
 185                 ;;
 186         f)
 187                 test "a$1" = a-n && die "Refusing to squash a merge: $sha1"
 188
 189                 first_parent=$(expr "$new_parents" : ' \([^ ]*\)')
 190                 # detach HEAD to current parent
 191                 output git checkout $first_parent 2> /dev/null ||
 192                         die "Cannot move HEAD to $first_parent"
 193
 194                 echo $sha1 > "$DOTEST"/current-commit
 195                 case "$new_parents" in
 196                 ' '*' '*)
 197                         # redo merge
 198                         author_script=$(get_author_ident_from_commit $sha1)
 199                         eval "$author_script"
 200                         msg="$(git cat-file commit $sha1 | sed -e '1,/^$/d')"
 201                         # No point in merging the first parent, that's HEAD
 202                         new_parents=${new_parents# $first_parent}
 203                         if ! GIT_AUTHOR_NAME="$GIT_AUTHOR_NAME" \
 204                                 GIT_AUTHOR_EMAIL="$GIT_AUTHOR_EMAIL" \
 205                                 GIT_AUTHOR_DATE="$GIT_AUTHOR_DATE" \
 206                                 output git merge $STRATEGY -m "$msg" \
 207                                         $new_parents
 208                         then
 209                                 git rerere
 210                                 printf "%s\n" "$msg" > "$GIT_DIR"/MERGE_MSG
 211                                 die Error redoing merge $sha1
 212                         fi
 213                         ;;
 214                 *)
 215                         output git cherry-pick "$@" ||
 216                                 die_with_patch $sha1 "Could not pick $sha1"
 217                         ;;
 218                 esac
 219                 ;;
 220         esac
 221 }
 222
 223 nth_string () {
 224         case "$1" in
 225         *1[0-9]|*[04-9]) echo "$1"th;;
 226         *1) echo "$1"st;;
 227         *2) echo "$1"nd;;
 228         *3) echo "$1"rd;;
 229         esac
 230 }
 231
 232 make_squash_message () {
 233         if test -f "$SQUASH_MSG"; then
 234                 COUNT=$(($(sed -n "s/^# This is [^0-9]*\([1-9][0-9]*\).*/\1/p" \
 235                         < "$SQUASH_MSG" | sed -ne '$p')+1))
 236                 echo "# This is a combination of $COUNT commits."
 237                 sed -e 1d -e '2,/^./{
 238                         /^$/d
 239                 }' <"$SQUASH_MSG"
 240         else
 241                 COUNT=2
 242                 echo "# This is a combination of two commits."
 243                 echo "# The first commit's message is:"
 244                 echo
 245                 git cat-file commit HEAD | sed -e '1,/^$/d'
 246         fi
 247         echo
 248         echo "# This is the $(nth_string $COUNT) commit message:"
 249         echo
 250         git cat-file commit $1 | sed -e '1,/^$/d'
 251 }
 252
 253 peek_next_command () {
 254         sed -n "1s/ .*$//p" < "$TODO"
 255 }
 256
 257 do_next () {
 258         rm -f "$DOTEST"/message "$DOTEST"/author-script \
 259                 "$DOTEST"/amend || exit
 260         read command sha1 rest < "$TODO"
 261         case "$command" in
 262         '#'*|'')
 263                 mark_action_done
 264                 ;;
 265         pick|p)
 266                 comment_for_reflog pick
 267
 268                 mark_action_done
 269                 pick_one $sha1 ||
 270                         die_with_patch $sha1 "Could not apply $sha1... $rest"
 271                 ;;
 272         edit|e)
 273                 comment_for_reflog edit
 274
 275                 mark_action_done
 276                 pick_one $sha1 ||
 277                         die_with_patch $sha1 "Could not apply $sha1... $rest"
 278                 make_patch $sha1
 279                 : > "$DOTEST"/amend
 280                 warn "Stopped at $sha1... $rest"
 281                 warn "You can amend the commit now, with"
 282                 warn
 283                 warn "  git commit --amend"
 284                 warn
 285                 warn "Once you are satisfied with your changes, run"
 286                 warn
 287                 warn "  git rebase --continue"
 288                 warn
 289                 exit 0
 290                 ;;
 291         squash|s)
 292                 comment_for_reflog squash
 293
 294                 has_action "$DONE" ||
 295                         die "Cannot 'squash' without a previous commit"
 296
 297                 mark_action_done
 298                 make_squash_message $sha1 > "$MSG"
 299                 case "$(peek_next_command)" in
 300                 squash|s)
 301                         EDIT_COMMIT=
 302                         USE_OUTPUT=output
 303                         cp "$MSG" "$SQUASH_MSG"
 304                         ;;
 305                 *)
 306                         EDIT_COMMIT=-e
 307                         USE_OUTPUT=
 308                         rm -f "$SQUASH_MSG" || exit
 309                         ;;
 310                 esac
 311
 312                 failed=f
 313                 author_script=$(get_author_ident_from_commit HEAD)
 314                 output git reset --soft HEAD^
 315                 pick_one -n $sha1 || failed=t
 316                 echo "$author_script" > "$DOTEST"/author-script
 317                 if test $failed = f
 318                 then
 319                         # This is like --amend, but with a different message
 320                         eval "$author_script"
 321                         GIT_AUTHOR_NAME="$GIT_AUTHOR_NAME" \
 322                         GIT_AUTHOR_EMAIL="$GIT_AUTHOR_EMAIL" \
 323                         GIT_AUTHOR_DATE="$GIT_AUTHOR_DATE" \
 324                         $USE_OUTPUT git commit --no-verify -F "$MSG" $EDIT_COMMIT || failed=t
 325                 fi
 326                 if test $failed = t
 327                 then
 328                         cp "$MSG" "$GIT_DIR"/MERGE_MSG
 329                         warn
 330                         warn "Could not apply $sha1... $rest"
 331                         die_with_patch $sha1 ""
 332                 fi
 333                 ;;
 334         *)
 335                 warn "Unknown command: $command $sha1 $rest"
 336                 die_with_patch $sha1 "Please fix this in the file $TODO."
 337                 ;;
 338         esac
 339         test -s "$TODO" && return
 340
 341         comment_for_reflog finish &&
 342         HEADNAME=$(cat "$DOTEST"/head-name) &&
 343         OLDHEAD=$(cat "$DOTEST"/head) &&
 344         SHORTONTO=$(git rev-parse --short $(cat "$DOTEST"/onto)) &&
 345         if test -d "$REWRITTEN"
 346         then
 347                 test -f "$DOTEST"/current-commit &&
 348                         current_commit=$(cat "$DOTEST"/current-commit) &&
 349                         git rev-parse HEAD > "$REWRITTEN"/$current_commit
 350                 if test -f "$REWRITTEN"/$OLDHEAD
 351                 then
 352                         NEWHEAD=$(cat "$REWRITTEN"/$OLDHEAD)
 353                 else
 354                         NEWHEAD=$OLDHEAD
 355                 fi
 356         else
 357                 NEWHEAD=$(git rev-parse HEAD)
 358         fi &&
 359         case $HEADNAME in
 360         refs/*)
 361                 message="$GIT_REFLOG_ACTION: $HEADNAME onto $SHORTONTO)" &&
 362                 git update-ref -m "$message" $HEADNAME $NEWHEAD $OLDHEAD &&
 363                 git symbolic-ref HEAD $HEADNAME
 364                 ;;
 365         esac && {
 366                 test ! -f "$DOTEST"/verbose ||
 367                         git diff-tree --stat $(cat "$DOTEST"/head)..HEAD
 368         } &&
 369         rm -rf "$DOTEST" &&
 370         git gc --auto &&
 371         warn "Successfully rebased and updated $HEADNAME."
 372
 373         exit
 374 }
 375
 376 do_rest () {
 377         while :
 378         do
 379                 do_next
 380         done
 381 }
 382
 383 # check if no other options are set
 384 is_standalone () {
 385         test $# -eq 2 -a "$2" = '--' &&
 386         test -z "$ONTO" &&
 387         test -z "$PRESERVE_MERGES" &&
 388         test -z "$STRATEGY" &&
 389         test -z "$VERBOSE"
 390 }
 391
 392 get_saved_options () {
 393         test -d "$REWRITTEN" && PRESERVE_MERGES=t
 394         test -f "$DOTEST"/strategy && STRATEGY="$(cat "$DOTEST"/strategy)"
 395         test -f "$DOTEST"/verbose && VERBOSE=t
 396 }
 397
 398 while test $# != 0
 399 do
 400         case "$1" in
 401         --continue)
 402                 is_standalone "$@" || usage
 403                 get_saved_options
 404                 comment_for_reflog continue
 405
 406                 test -d "$DOTEST" || die "No interactive rebase running"
 407
 408                 # Sanity check
 409                 git rev-parse --verify HEAD >/dev/null ||
 410                         die "Cannot read HEAD"
 411                 git update-index --ignore-submodules --refresh &&
 412                         git diff-files --quiet --ignore-submodules ||
 413                         die "Working tree is dirty"
 414
 415                 # do we have anything to commit?
 416                 if git diff-index --cached --quiet --ignore-submodules HEAD --
 417                 then
 418                         : Nothing to commit -- skip this
 419                 else
 420                         . "$DOTEST"/author-script ||
 421                                 die "Cannot find the author identity"
 422                         if test -f "$DOTEST"/amend
 423                         then
 424                                 git reset --soft HEAD^ ||
 425                                 die "Cannot rewind the HEAD"
 426                         fi
 427                         export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_AUTHOR_DATE &&
 428                         git commit --no-verify -F "$DOTEST"/message -e ||
 429                         die "Could not commit staged changes."
 430                 fi
 431
 432                 require_clean_work_tree
 433                 do_rest
 434                 ;;
 435         --abort)
 436                 is_standalone "$@" || usage
 437                 get_saved_options
 438                 comment_for_reflog abort
 439
 440                 git rerere clear
 441                 test -d "$DOTEST" || die "No interactive rebase running"
 442
 443                 HEADNAME=$(cat "$DOTEST"/head-name)
 444                 HEAD=$(cat "$DOTEST"/head)
 445                 case $HEADNAME in
 446                 refs/*)
 447                         git symbolic-ref HEAD $HEADNAME
 448                         ;;
 449                 esac &&
 450                 output git reset --hard $HEAD &&
 451                 rm -rf "$DOTEST"
 452                 exit
 453                 ;;
 454         --skip)
 455                 is_standalone "$@" || usage
 456                 get_saved_options
 457                 comment_for_reflog skip
 458
 459                 git rerere clear
 460                 test -d "$DOTEST" || die "No interactive rebase running"
 461
 462                 output git reset --hard && do_rest
 463                 ;;
 464         -s)
 465                 case "$#,$1" in
 466                 *,*=*)
 467                         STRATEGY="-s "$(expr "z$1" : 'z-[^=]*=\(.*\)') ;;
 468                 1,*)
 469                         usage ;;
 470                 *)
 471                         STRATEGY="-s $2"
 472                         shift ;;
 473                 esac
 474                 ;;
 475         -m)
 476                 # we use merge anyway
 477                 ;;
 478         -v)
 479                 VERBOSE=t
 480                 ;;
 481         -p)
 482                 PRESERVE_MERGES=t
 483                 ;;
 484         -i)
 485                 # yeah, we know
 486                 ;;
 487         --onto)
 488                 shift
 489                 ONTO=$(git rev-parse --verify "$1") ||
 490                         die "Does not point to a valid commit: $1"
 491                 ;;
 492         --)
 493                 shift
 494                 test $# -eq 1 -o $# -eq 2 || usage
 495                 test -d "$DOTEST" &&
 496                         die "Interactive rebase already started"
 497
 498                 git var GIT_COMMITTER_IDENT >/dev/null ||
 499                         die "You need to set your committer info first"
 500
 501                 comment_for_reflog start
 502
 503                 require_clean_work_tree
 504
 505                 UPSTREAM=$(git rev-parse --verify "$1") || die "Invalid base"
 506                 test -z "$ONTO" && ONTO=$UPSTREAM
 507
 508                 if test ! -z "$2"
 509                 then
 510                         output git show-ref --verify --quiet "refs/heads/$2" ||
 511                                 die "Invalid branchname: $2"
 512                         output git checkout "$2" ||
 513                                 die "Could not checkout $2"
 514                 fi
 515
 516                 HEAD=$(git rev-parse --verify HEAD) || die "No HEAD?"
 517                 mkdir "$DOTEST" || die "Could not create temporary $DOTEST"
 518
 519                 : > "$DOTEST"/interactive || die "Could not mark as interactive"
 520                 git symbolic-ref HEAD > "$DOTEST"/head-name 2> /dev/null ||
 521                         echo "detached HEAD" > "$DOTEST"/head-name
 522
 523                 echo $HEAD > "$DOTEST"/head
 524                 echo $UPSTREAM > "$DOTEST"/upstream
 525                 echo $ONTO > "$DOTEST"/onto
 526                 test -z "$STRATEGY" || echo "$STRATEGY" > "$DOTEST"/strategy
 527                 test t = "$VERBOSE" && : > "$DOTEST"/verbose
 528                 if test t = "$PRESERVE_MERGES"
 529                 then
 530                         # $REWRITTEN contains files for each commit that is
 531                         # reachable by at least one merge base of $HEAD and
 532                         # $UPSTREAM. They are not necessarily rewritten, but
 533                         # their children might be.
 534                         # This ensures that commits on merged, but otherwise
 535                         # unrelated side branches are left alone. (Think "X"
 536                         # in the man page's example.)
 537                         mkdir "$REWRITTEN" &&
 538                         for c in $(git merge-base --all $HEAD $UPSTREAM)
 539                         do
 540                                 echo $ONTO > "$REWRITTEN"/$c ||
 541                                         die "Could not init rewritten commits"
 542                         done
 543                         MERGES_OPTION=
 544                 else
 545                         MERGES_OPTION=--no-merges
 546                 fi
 547
 548                 SHORTUPSTREAM=$(git rev-parse --short $UPSTREAM)
 549                 SHORTHEAD=$(git rev-parse --short $HEAD)
 550                 SHORTONTO=$(git rev-parse --short $ONTO)
 551                 git rev-list $MERGES_OPTION --pretty=oneline --abbrev-commit \
 552                         --abbrev=7 --reverse --left-right --cherry-pick \
 553                         $UPSTREAM...$HEAD | \
 554                         sed -n "s/^>/pick /p" > "$TODO"
 555                 cat >> "$TODO" << EOF
 556
 557 # Rebase $SHORTUPSTREAM..$SHORTHEAD onto $SHORTONTO
 558 #
 559 # Commands:
 560 #  p, pick = use commit
 561 #  e, edit = use commit, but stop for amending
 562 #  s, squash = use commit, but meld into previous commit
 563 #
 564 # If you remove a line here THAT COMMIT WILL BE LOST.
 565 # However, if you remove everything, the rebase will be aborted.
 566 #
 567 EOF
 568
 569                 has_action "$TODO" ||
 570                         die_abort "Nothing to do"
 571
 572                 cp "$TODO" "$TODO".backup
 573                 git_editor "$TODO" ||
 574                         die "Could not execute editor"
 575
 576                 has_action "$TODO" ||
 577                         die_abort "Nothing to do"
 578
 579                 git update-ref ORIG_HEAD $HEAD
 580                 output git checkout $ONTO && do_rest
 581                 ;;
 582         esac
 583         shift
 584 done