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 run_pre_rebase_hook () {
  69         if test -x "$GIT_DIR/hooks/pre-rebase"
  70         then
  71                 "$GIT_DIR/hooks/pre-rebase" ${1+"$@"} || {
  72                         echo >&2 "The pre-rebase hook refused to rebase."
  73                         exit 1
  74                 }
  75         fi
  76 }
  77
  78 require_clean_work_tree () {
  79         # test if working tree is dirty
  80         git rev-parse --verify HEAD > /dev/null &&
  81         git update-index --ignore-submodules --refresh &&
  82         git diff-files --quiet --ignore-submodules &&
  83         git diff-index --cached --quiet HEAD --ignore-submodules -- ||
  84         die "Working tree is dirty"
  85 }
  86
  87 ORIG_REFLOG_ACTION="$GIT_REFLOG_ACTION"
  88
  89 comment_for_reflog () {
  90         case "$ORIG_REFLOG_ACTION" in
  91         ''|rebase*)
  92                 GIT_REFLOG_ACTION="rebase -i ($1)"
  93                 export GIT_REFLOG_ACTION
  94                 ;;
  95         esac
  96 }
  97
  98 last_count=
  99 mark_action_done () {
 100         sed -e 1q < "$TODO" >> "$DONE"
 101         sed -e 1d < "$TODO" >> "$TODO".new
 102         mv -f "$TODO".new "$TODO"
 103         count=$(grep -c '^[^#]' < "$DONE")
 104         total=$(($count+$(grep -c '^[^#]' < "$TODO")))
 105         if test "$last_count" != "$count"
 106         then
 107                 last_count=$count
 108                 printf "Rebasing (%d/%d)\r" $count $total
 109                 test -z "$VERBOSE" || echo
 110         fi
 111 }
 112
 113 make_patch () {
 114         parent_sha1=$(git rev-parse --verify "$1"^) ||
 115                 die "Cannot get patch for $1^"
 116         git diff-tree -p "$parent_sha1".."$1" > "$DOTEST"/patch
 117         test -f "$DOTEST"/message ||
 118                 git cat-file commit "$1" | sed "1,/^$/d" > "$DOTEST"/message
 119         test -f "$DOTEST"/author-script ||
 120                 get_author_ident_from_commit "$1" > "$DOTEST"/author-script
 121 }
 122
 123 die_with_patch () {
 124         make_patch "$1"
 125         git rerere
 126         die "$2"
 127 }
 128
 129 die_abort () {
 130         rm -rf "$DOTEST"
 131         die "$1"
 132 }
 133
 134 has_action () {
 135         grep '^[^#]' "$1" >/dev/null
 136 }
 137
 138 pick_one () {
 139         no_ff=
 140         case "$1" in -n) sha1=$2; no_ff=t ;; *) sha1=$1 ;; esac
 141         output git rev-parse --verify $sha1 || die "Invalid commit name: $sha1"
 142         test -d "$REWRITTEN" &&
 143                 pick_one_preserving_merges "$@" && return
 144         parent_sha1=$(git rev-parse --verify $sha1^) ||
 145                 die "Could not get the parent of $sha1"
 146         current_sha1=$(git rev-parse --verify HEAD)
 147         if test "$no_ff$current_sha1" = "$parent_sha1"; then
 148                 output git reset --hard $sha1
 149                 test "a$1" = a-n && output git reset --soft $current_sha1
 150                 sha1=$(git rev-parse --short $sha1)
 151                 output warn Fast forward to $sha1
 152         else
 153                 output git cherry-pick "$@"
 154         fi
 155 }
 156
 157 pick_one_preserving_merges () {
 158         fast_forward=t
 159         case "$1" in
 160         -n)
 161                 fast_forward=f
 162                 sha1=$2
 163                 ;;
 164         *)
 165                 sha1=$1
 166                 ;;
 167         esac
 168         sha1=$(git rev-parse $sha1)
 169
 170         if test -f "$DOTEST"/current-commit
 171         then
 172                 current_commit=$(cat "$DOTEST"/current-commit) &&
 173                 git rev-parse HEAD > "$REWRITTEN"/$current_commit &&
 174                 rm "$DOTEST"/current-commit ||
 175                 die "Cannot write current commit's replacement sha1"
 176         fi
 177
 178         echo $sha1 > "$DOTEST"/current-commit
 179
 180         # rewrite parents; if none were rewritten, we can fast-forward.
 181         new_parents=
 182         for p in $(git rev-list --parents -1 $sha1 | cut -d' ' -f2-)
 183         do
 184                 if test -f "$REWRITTEN"/$p
 185                 then
 186                         new_p=$(cat "$REWRITTEN"/$p)
 187                         test $p != $new_p && fast_forward=f
 188                         case "$new_parents" in
 189                         *$new_p*)
 190                                 ;; # do nothing; that parent is already there
 191                         *)
 192                                 new_parents="$new_parents $new_p"
 193                                 ;;
 194                         esac
 195                 else
 196                         new_parents="$new_parents $p"
 197                 fi
 198         done
 199         case $fast_forward in
 200         t)
 201                 output warn "Fast forward to $sha1"
 202                 output git reset --hard $sha1 ||
 203                         die "Cannot fast forward to $sha1"
 204                 ;;
 205         f)
 206                 test "a$1" = a-n && die "Refusing to squash a merge: $sha1"
 207
 208                 first_parent=$(expr "$new_parents" : ' \([^ ]*\)')
 209                 # detach HEAD to current parent
 210                 output git checkout $first_parent 2> /dev/null ||
 211                         die "Cannot move HEAD to $first_parent"
 212
 213                 case "$new_parents" in
 214                 ' '*' '*)
 215                         # redo merge
 216                         author_script=$(get_author_ident_from_commit $sha1)
 217                         eval "$author_script"
 218                         msg="$(git cat-file commit $sha1 | sed -e '1,/^$/d')"
 219                         # No point in merging the first parent, that's HEAD
 220                         new_parents=${new_parents# $first_parent}
 221                         if ! GIT_AUTHOR_NAME="$GIT_AUTHOR_NAME" \
 222                                 GIT_AUTHOR_EMAIL="$GIT_AUTHOR_EMAIL" \
 223                                 GIT_AUTHOR_DATE="$GIT_AUTHOR_DATE" \
 224                                 output git merge $STRATEGY -m "$msg" \
 225                                         $new_parents
 226                         then
 227                                 git rerere
 228                                 printf "%s\n" "$msg" > "$GIT_DIR"/MERGE_MSG
 229                                 die Error redoing merge $sha1
 230                         fi
 231                         ;;
 232                 *)
 233                         output git cherry-pick "$@" ||
 234                                 die_with_patch $sha1 "Could not pick $sha1"
 235                         ;;
 236                 esac
 237                 ;;
 238         esac
 239 }
 240
 241 nth_string () {
 242         case "$1" in
 243         *1[0-9]|*[04-9]) echo "$1"th;;
 244         *1) echo "$1"st;;
 245         *2) echo "$1"nd;;
 246         *3) echo "$1"rd;;
 247         esac
 248 }
 249
 250 make_squash_message () {
 251         if test -f "$SQUASH_MSG"; then
 252                 COUNT=$(($(sed -n "s/^# This is [^0-9]*\([1-9][0-9]*\).*/\1/p" \
 253                         < "$SQUASH_MSG" | sed -ne '$p')+1))
 254                 echo "# This is a combination of $COUNT commits."
 255                 sed -e 1d -e '2,/^./{
 256                         /^$/d
 257                 }' <"$SQUASH_MSG"
 258         else
 259                 COUNT=2
 260                 echo "# This is a combination of two commits."
 261                 echo "# The first commit's message is:"
 262                 echo
 263                 git cat-file commit HEAD | sed -e '1,/^$/d'
 264         fi
 265         echo
 266         echo "# This is the $(nth_string $COUNT) commit message:"
 267         echo
 268         git cat-file commit $1 | sed -e '1,/^$/d'
 269 }
 270
 271 peek_next_command () {
 272         sed -n "1s/ .*$//p" < "$TODO"
 273 }
 274
 275 do_next () {
 276         rm -f "$DOTEST"/message "$DOTEST"/author-script \
 277                 "$DOTEST"/amend || exit
 278         read command sha1 rest < "$TODO"
 279         case "$command" in
 280         '#'*|'')
 281                 mark_action_done
 282                 ;;
 283         pick|p)
 284                 comment_for_reflog pick
 285
 286                 mark_action_done
 287                 pick_one $sha1 ||
 288                         die_with_patch $sha1 "Could not apply $sha1... $rest"
 289                 ;;
 290         edit|e)
 291                 comment_for_reflog edit
 292
 293                 mark_action_done
 294                 pick_one $sha1 ||
 295                         die_with_patch $sha1 "Could not apply $sha1... $rest"
 296                 make_patch $sha1
 297                 git rev-parse --verify HEAD > "$DOTEST"/amend
 298                 warn "Stopped at $sha1... $rest"
 299                 warn "You can amend the commit now, with"
 300                 warn
 301                 warn "  git commit --amend"
 302                 warn
 303                 warn "Once you are satisfied with your changes, run"
 304                 warn
 305                 warn "  git rebase --continue"
 306                 warn
 307                 exit 0
 308                 ;;
 309         squash|s)
 310                 comment_for_reflog squash
 311
 312                 has_action "$DONE" ||
 313                         die "Cannot 'squash' without a previous commit"
 314
 315                 mark_action_done
 316                 make_squash_message $sha1 > "$MSG"
 317                 case "$(peek_next_command)" in
 318                 squash|s)
 319                         EDIT_COMMIT=
 320                         USE_OUTPUT=output
 321                         cp "$MSG" "$SQUASH_MSG"
 322                         ;;
 323                 *)
 324                         EDIT_COMMIT=-e
 325                         USE_OUTPUT=
 326                         rm -f "$SQUASH_MSG" || exit
 327                         ;;
 328                 esac
 329
 330                 failed=f
 331                 author_script=$(get_author_ident_from_commit HEAD)
 332                 output git reset --soft HEAD^
 333                 pick_one -n $sha1 || failed=t
 334                 echo "$author_script" > "$DOTEST"/author-script
 335                 if test $failed = f
 336                 then
 337                         # This is like --amend, but with a different message
 338                         eval "$author_script"
 339                         GIT_AUTHOR_NAME="$GIT_AUTHOR_NAME" \
 340                         GIT_AUTHOR_EMAIL="$GIT_AUTHOR_EMAIL" \
 341                         GIT_AUTHOR_DATE="$GIT_AUTHOR_DATE" \
 342                         $USE_OUTPUT git commit --no-verify -F "$MSG" $EDIT_COMMIT || failed=t
 343                 fi
 344                 if test $failed = t
 345                 then
 346                         cp "$MSG" "$GIT_DIR"/MERGE_MSG
 347                         warn
 348                         warn "Could not apply $sha1... $rest"
 349                         die_with_patch $sha1 ""
 350                 fi
 351                 ;;
 352         *)
 353                 warn "Unknown command: $command $sha1 $rest"
 354                 die_with_patch $sha1 "Please fix this in the file $TODO."
 355                 ;;
 356         esac
 357         test -s "$TODO" && return
 358
 359         comment_for_reflog finish &&
 360         HEADNAME=$(cat "$DOTEST"/head-name) &&
 361         OLDHEAD=$(cat "$DOTEST"/head) &&
 362         SHORTONTO=$(git rev-parse --short $(cat "$DOTEST"/onto)) &&
 363         if test -d "$REWRITTEN"
 364         then
 365                 test -f "$DOTEST"/current-commit &&
 366                         current_commit=$(cat "$DOTEST"/current-commit) &&
 367                         git rev-parse HEAD > "$REWRITTEN"/$current_commit
 368                 if test -f "$REWRITTEN"/$OLDHEAD
 369                 then
 370                         NEWHEAD=$(cat "$REWRITTEN"/$OLDHEAD)
 371                 else
 372                         NEWHEAD=$OLDHEAD
 373                 fi
 374         else
 375                 NEWHEAD=$(git rev-parse HEAD)
 376         fi &&
 377         case $HEADNAME in
 378         refs/*)
 379                 message="$GIT_REFLOG_ACTION: $HEADNAME onto $SHORTONTO)" &&
 380                 git update-ref -m "$message" $HEADNAME $NEWHEAD $OLDHEAD &&
 381                 git symbolic-ref HEAD $HEADNAME
 382                 ;;
 383         esac && {
 384                 test ! -f "$DOTEST"/verbose ||
 385                         git diff-tree --stat $(cat "$DOTEST"/head)..HEAD
 386         } &&
 387         rm -rf "$DOTEST" &&
 388         git gc --auto &&
 389         warn "Successfully rebased and updated $HEADNAME."
 390
 391         exit
 392 }
 393
 394 do_rest () {
 395         while :
 396         do
 397                 do_next
 398         done
 399 }
 400
 401 # check if no other options are set
 402 is_standalone () {
 403         test $# -eq 2 -a "$2" = '--' &&
 404         test -z "$ONTO" &&
 405         test -z "$PRESERVE_MERGES" &&
 406         test -z "$STRATEGY" &&
 407         test -z "$VERBOSE"
 408 }
 409
 410 get_saved_options () {
 411         test -d "$REWRITTEN" && PRESERVE_MERGES=t
 412         test -f "$DOTEST"/strategy && STRATEGY="$(cat "$DOTEST"/strategy)"
 413         test -f "$DOTEST"/verbose && VERBOSE=t
 414 }
 415
 416 while test $# != 0
 417 do
 418         case "$1" in
 419         --continue)
 420                 is_standalone "$@" || usage
 421                 get_saved_options
 422                 comment_for_reflog continue
 423
 424                 test -d "$DOTEST" || die "No interactive rebase running"
 425
 426                 # Sanity check
 427                 git rev-parse --verify HEAD >/dev/null ||
 428                         die "Cannot read HEAD"
 429                 git update-index --ignore-submodules --refresh &&
 430                         git diff-files --quiet --ignore-submodules ||
 431                         die "Working tree is dirty"
 432
 433                 # do we have anything to commit?
 434                 if git diff-index --cached --quiet --ignore-submodules HEAD --
 435                 then
 436                         : Nothing to commit -- skip this
 437                 else
 438                         . "$DOTEST"/author-script ||
 439                                 die "Cannot find the author identity"
 440                         amend=
 441                         if test -f "$DOTEST"/amend
 442                         then
 443                                 amend=$(git rev-parse --verify HEAD)
 444                                 test "$amend" = $(cat "$DOTEST"/amend) ||
 445                                 die "\
 446 You have uncommitted changes in your working tree. Please, commit them
 447 first and then run 'git rebase --continue' again."
 448                                 git reset --soft HEAD^ ||
 449                                 die "Cannot rewind the HEAD"
 450                         fi
 451                         export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_AUTHOR_DATE &&
 452                         git commit --no-verify -F "$DOTEST"/message -e || {
 453                                 test -n "$amend" && git reset --soft $amend
 454                                 die "Could not commit staged changes."
 455                         }
 456                 fi
 457
 458                 require_clean_work_tree
 459                 do_rest
 460                 ;;
 461         --abort)
 462                 is_standalone "$@" || usage
 463                 get_saved_options
 464                 comment_for_reflog abort
 465
 466                 git rerere clear
 467                 test -d "$DOTEST" || die "No interactive rebase running"
 468
 469                 HEADNAME=$(cat "$DOTEST"/head-name)
 470                 HEAD=$(cat "$DOTEST"/head)
 471                 case $HEADNAME in
 472                 refs/*)
 473                         git symbolic-ref HEAD $HEADNAME
 474                         ;;
 475                 esac &&
 476                 output git reset --hard $HEAD &&
 477                 rm -rf "$DOTEST"
 478                 exit
 479                 ;;
 480         --skip)
 481                 is_standalone "$@" || usage
 482                 get_saved_options
 483                 comment_for_reflog skip
 484
 485                 git rerere clear
 486                 test -d "$DOTEST" || die "No interactive rebase running"
 487
 488                 output git reset --hard && do_rest
 489                 ;;
 490         -s)
 491                 case "$#,$1" in
 492                 *,*=*)
 493                         STRATEGY="-s "$(expr "z$1" : 'z-[^=]*=\(.*\)') ;;
 494                 1,*)
 495                         usage ;;
 496                 *)
 497                         STRATEGY="-s $2"
 498                         shift ;;
 499                 esac
 500                 ;;
 501         -m)
 502                 # we use merge anyway
 503                 ;;
 504         -v)
 505                 VERBOSE=t
 506                 ;;
 507         -p)
 508                 PRESERVE_MERGES=t
 509                 ;;
 510         -i)
 511                 # yeah, we know
 512                 ;;
 513         --onto)
 514                 shift
 515                 ONTO=$(git rev-parse --verify "$1") ||
 516                         die "Does not point to a valid commit: $1"
 517                 ;;
 518         --)
 519                 shift
 520                 run_pre_rebase_hook ${1+"$@"}
 521                 test $# -eq 1 -o $# -eq 2 || usage
 522                 test -d "$DOTEST" &&
 523                         die "Interactive rebase already started"
 524
 525                 git var GIT_COMMITTER_IDENT >/dev/null ||
 526                         die "You need to set your committer info first"
 527
 528                 comment_for_reflog start
 529
 530                 require_clean_work_tree
 531
 532                 UPSTREAM=$(git rev-parse --verify "$1") || die "Invalid base"
 533                 test -z "$ONTO" && ONTO=$UPSTREAM
 534
 535                 if test ! -z "$2"
 536                 then
 537                         output git show-ref --verify --quiet "refs/heads/$2" ||
 538                                 die "Invalid branchname: $2"
 539                         output git checkout "$2" ||
 540                                 die "Could not checkout $2"
 541                 fi
 542
 543                 HEAD=$(git rev-parse --verify HEAD) || die "No HEAD?"
 544                 mkdir "$DOTEST" || die "Could not create temporary $DOTEST"
 545
 546                 : > "$DOTEST"/interactive || die "Could not mark as interactive"
 547                 git symbolic-ref HEAD > "$DOTEST"/head-name 2> /dev/null ||
 548                         echo "detached HEAD" > "$DOTEST"/head-name
 549
 550                 echo $HEAD > "$DOTEST"/head
 551                 echo $UPSTREAM > "$DOTEST"/upstream
 552                 echo $ONTO > "$DOTEST"/onto
 553                 test -z "$STRATEGY" || echo "$STRATEGY" > "$DOTEST"/strategy
 554                 test t = "$VERBOSE" && : > "$DOTEST"/verbose
 555                 if test t = "$PRESERVE_MERGES"
 556                 then
 557                         # $REWRITTEN contains files for each commit that is
 558                         # reachable by at least one merge base of $HEAD and
 559                         # $UPSTREAM. They are not necessarily rewritten, but
 560                         # their children might be.
 561                         # This ensures that commits on merged, but otherwise
 562                         # unrelated side branches are left alone. (Think "X"
 563                         # in the man page's example.)
 564                         mkdir "$REWRITTEN" &&
 565                         for c in $(git merge-base --all $HEAD $UPSTREAM)
 566                         do
 567                                 echo $ONTO > "$REWRITTEN"/$c ||
 568                                         die "Could not init rewritten commits"
 569                         done
 570                         MERGES_OPTION=
 571                 else
 572                         MERGES_OPTION=--no-merges
 573                 fi
 574
 575                 SHORTUPSTREAM=$(git rev-parse --short $UPSTREAM)
 576                 SHORTHEAD=$(git rev-parse --short $HEAD)
 577                 SHORTONTO=$(git rev-parse --short $ONTO)
 578                 git rev-list $MERGES_OPTION --pretty=oneline --abbrev-commit \
 579                         --abbrev=7 --reverse --left-right --cherry-pick \
 580                         $UPSTREAM...$HEAD | \
 581                         sed -n "s/^>/pick /p" > "$TODO"
 582                 cat >> "$TODO" << EOF
 583
 584 # Rebase $SHORTUPSTREAM..$SHORTHEAD onto $SHORTONTO
 585 #
 586 # Commands:
 587 #  p, pick = use commit
 588 #  e, edit = use commit, but stop for amending
 589 #  s, squash = use commit, but meld into previous commit
 590 #
 591 # If you remove a line here THAT COMMIT WILL BE LOST.
 592 # However, if you remove everything, the rebase will be aborted.
 593 #
 594 EOF
 595
 596                 has_action "$TODO" ||
 597                         die_abort "Nothing to do"
 598
 599                 cp "$TODO" "$TODO".backup
 600                 git_editor "$TODO" ||
 601                         die "Could not execute editor"
 602
 603                 has_action "$TODO" ||
 604                         die_abort "Nothing to do"
 605
 606                 git update-ref ORIG_HEAD $HEAD
 607                 output git checkout $ONTO && do_rest
 608                 ;;
 609         esac
 610         shift
 611 done