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