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