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                 exit 0
 272                 ;;
 273         squash|s)
 274                 comment_for_reflog squash
 275
 276                 has_action "$DONE" ||
 277                         die "Cannot 'squash' without a previous commit"
 278
 279                 mark_action_done
 280                 make_squash_message $sha1 > "$MSG"
 281                 case "$(peek_next_command)" in
 282                 squash|s)
 283                         EDIT_COMMIT=
 284                         USE_OUTPUT=output
 285                         cp "$MSG" "$SQUASH_MSG"
 286                         ;;
 287                 *)
 288                         EDIT_COMMIT=-e
 289                         USE_OUTPUT=
 290                         rm -f "$SQUASH_MSG" || exit
 291                         ;;
 292                 esac
 293
 294                 failed=f
 295                 author_script=$(get_author_ident_from_commit HEAD)
 296                 output git reset --soft HEAD^
 297                 pick_one -n $sha1 || failed=t
 298                 echo "$author_script" > "$DOTEST"/author-script
 299                 if test $failed = f
 300                 then
 301                         # This is like --amend, but with a different message
 302                         eval "$author_script"
 303                         GIT_AUTHOR_NAME="$GIT_AUTHOR_NAME" \
 304                         GIT_AUTHOR_EMAIL="$GIT_AUTHOR_EMAIL" \
 305                         GIT_AUTHOR_DATE="$GIT_AUTHOR_DATE" \
 306                         $USE_OUTPUT git commit --no-verify -F "$MSG" $EDIT_COMMIT || failed=t
 307                 fi
 308                 if test $failed = t
 309                 then
 310                         cp "$MSG" "$GIT_DIR"/MERGE_MSG
 311                         warn
 312                         warn "Could not apply $sha1... $rest"
 313                         die_with_patch $sha1 ""
 314                 fi
 315                 ;;
 316         *)
 317                 warn "Unknown command: $command $sha1 $rest"
 318                 die_with_patch $sha1 "Please fix this in the file $TODO."
 319                 ;;
 320         esac
 321         test -s "$TODO" && return
 322
 323         comment_for_reflog finish &&
 324         HEADNAME=$(cat "$DOTEST"/head-name) &&
 325         OLDHEAD=$(cat "$DOTEST"/head) &&
 326         SHORTONTO=$(git rev-parse --short $(cat "$DOTEST"/onto)) &&
 327         if test -d "$REWRITTEN"
 328         then
 329                 test -f "$DOTEST"/current-commit &&
 330                         current_commit=$(cat "$DOTEST"/current-commit) &&
 331                         git rev-parse HEAD > "$REWRITTEN"/$current_commit
 332                 if test -f "$REWRITTEN"/$OLDHEAD
 333                 then
 334                         NEWHEAD=$(cat "$REWRITTEN"/$OLDHEAD)
 335                 else
 336                         NEWHEAD=$OLDHEAD
 337                 fi
 338         else
 339                 NEWHEAD=$(git rev-parse HEAD)
 340         fi &&
 341         case $HEADNAME in
 342         refs/*)
 343                 message="$GIT_REFLOG_ACTION: $HEADNAME onto $SHORTONTO)" &&
 344                 git update-ref -m "$message" $HEADNAME $NEWHEAD $OLDHEAD &&
 345                 git symbolic-ref HEAD $HEADNAME
 346                 ;;
 347         esac && {
 348                 test ! -f "$DOTEST"/verbose ||
 349                         git diff-tree --stat $(cat "$DOTEST"/head)..HEAD
 350         } &&
 351         rm -rf "$DOTEST" &&
 352         git gc --auto &&
 353         warn "Successfully rebased and updated $HEADNAME."
 354
 355         exit
 356 }
 357
 358 do_rest () {
 359         while :
 360         do
 361                 do_next
 362         done
 363 }
 364
 365 while test $# != 0
 366 do
 367         case "$1" in
 368         --continue)
 369                 comment_for_reflog continue
 370
 371                 test -d "$DOTEST" || die "No interactive rebase running"
 372
 373                 # Sanity check
 374                 git rev-parse --verify HEAD >/dev/null ||
 375                         die "Cannot read HEAD"
 376                 git update-index --refresh && git diff-files --quiet ||
 377                         die "Working tree is dirty"
 378
 379                 # do we have anything to commit?
 380                 if git diff-index --cached --quiet HEAD --
 381                 then
 382                         : Nothing to commit -- skip this
 383                 else
 384                         . "$DOTEST"/author-script ||
 385                                 die "Cannot find the author identity"
 386                         if test -f "$DOTEST"/amend
 387                         then
 388                                 git reset --soft HEAD^ ||
 389                                 die "Cannot rewind the HEAD"
 390                         fi
 391                         export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_AUTHOR_DATE &&
 392                         git commit --no-verify -F "$DOTEST"/message -e ||
 393                         die "Could not commit staged changes."
 394                 fi
 395
 396                 require_clean_work_tree
 397                 do_rest
 398                 ;;
 399         --abort)
 400                 comment_for_reflog abort
 401
 402                 git rerere clear
 403                 test -d "$DOTEST" || die "No interactive rebase running"
 404
 405                 HEADNAME=$(cat "$DOTEST"/head-name)
 406                 HEAD=$(cat "$DOTEST"/head)
 407                 case $HEADNAME in
 408                 refs/*)
 409                         git symbolic-ref HEAD $HEADNAME
 410                         ;;
 411                 esac &&
 412                 output git reset --hard $HEAD &&
 413                 rm -rf "$DOTEST"
 414                 exit
 415                 ;;
 416         --skip)
 417                 comment_for_reflog skip
 418
 419                 git rerere clear
 420                 test -d "$DOTEST" || die "No interactive rebase running"
 421
 422                 output git reset --hard && do_rest
 423                 ;;
 424         -s|--strategy)
 425                 case "$#,$1" in
 426                 *,*=*)
 427                         STRATEGY="-s "$(expr "z$1" : 'z-[^=]*=\(.*\)') ;;
 428                 1,*)
 429                         usage ;;
 430                 *)
 431                         STRATEGY="-s $2"
 432                         shift ;;
 433                 esac
 434                 ;;
 435         --merge)
 436                 # we use merge anyway
 437                 ;;
 438         -C*)
 439                 die "Interactive rebase uses merge, so $1 does not make sense"
 440                 ;;
 441         -v|--verbose)
 442                 VERBOSE=t
 443                 ;;
 444         -p|--preserve-merges)
 445                 PRESERVE_MERGES=t
 446                 ;;
 447         -i|--interactive)
 448                 # yeah, we know
 449                 ;;
 450         ''|-h)
 451                 usage
 452                 ;;
 453         *)
 454                 test -d "$DOTEST" &&
 455                         die "Interactive rebase already started"
 456
 457                 git var GIT_COMMITTER_IDENT >/dev/null ||
 458                         die "You need to set your committer info first"
 459
 460                 comment_for_reflog start
 461
 462                 ONTO=
 463                 case "$1" in
 464                 --onto)
 465                         ONTO=$(git rev-parse --verify "$2") ||
 466                                 die "Does not point to a valid commit: $2"
 467                         shift; shift
 468                         ;;
 469                 esac
 470
 471                 require_clean_work_tree
 472
 473                 if test ! -z "$2"
 474                 then
 475                         output git show-ref --verify --quiet "refs/heads/$2" ||
 476                                 die "Invalid branchname: $2"
 477                         output git checkout "$2" ||
 478                                 die "Could not checkout $2"
 479                 fi
 480
 481                 HEAD=$(git rev-parse --verify HEAD) || die "No HEAD?"
 482                 UPSTREAM=$(git rev-parse --verify "$1") || die "Invalid base"
 483
 484                 mkdir "$DOTEST" || die "Could not create temporary $DOTEST"
 485
 486                 test -z "$ONTO" && ONTO=$UPSTREAM
 487
 488                 : > "$DOTEST"/interactive || die "Could not mark as interactive"
 489                 git symbolic-ref HEAD > "$DOTEST"/head-name 2> /dev/null ||
 490                         echo "detached HEAD" > "$DOTEST"/head-name
 491
 492                 echo $HEAD > "$DOTEST"/head
 493                 echo $UPSTREAM > "$DOTEST"/upstream
 494                 echo $ONTO > "$DOTEST"/onto
 495                 test -z "$STRATEGY" || echo "$STRATEGY" > "$DOTEST"/strategy
 496                 test t = "$VERBOSE" && : > "$DOTEST"/verbose
 497                 if test t = "$PRESERVE_MERGES"
 498                 then
 499                         # $REWRITTEN contains files for each commit that is
 500                         # reachable by at least one merge base of $HEAD and
 501                         # $UPSTREAM. They are not necessarily rewritten, but
 502                         # their children might be.
 503                         # This ensures that commits on merged, but otherwise
 504                         # unrelated side branches are left alone. (Think "X"
 505                         # in the man page's example.)
 506                         mkdir "$REWRITTEN" &&
 507                         for c in $(git merge-base --all $HEAD $UPSTREAM)
 508                         do
 509                                 echo $ONTO > "$REWRITTEN"/$c ||
 510                                         die "Could not init rewritten commits"
 511                         done
 512                         MERGES_OPTION=
 513                 else
 514                         MERGES_OPTION=--no-merges
 515                 fi
 516
 517                 SHORTUPSTREAM=$(git rev-parse --short $UPSTREAM)
 518                 SHORTHEAD=$(git rev-parse --short $HEAD)
 519                 SHORTONTO=$(git rev-parse --short $ONTO)
 520                 git rev-list $MERGES_OPTION --pretty=oneline --abbrev-commit \
 521                         --abbrev=7 --reverse --left-right --cherry-pick \
 522                         $UPSTREAM...$HEAD | \
 523                         sed -n "s/^>/pick /p" > "$TODO"
 524                 cat >> "$TODO" << EOF
 525
 526 # Rebase $SHORTUPSTREAM..$SHORTHEAD onto $SHORTONTO
 527 #
 528 # Commands:
 529 #  pick = use commit
 530 #  edit = use commit, but stop for amending
 531 #  squash = use commit, but meld into previous commit
 532 #
 533 # If you remove a line here THAT COMMIT WILL BE LOST.
 534 # However, if you remove everything, the rebase will be aborted.
 535 #
 536 EOF
 537
 538                 has_action "$TODO" ||
 539                         die_abort "Nothing to do"
 540
 541                 cp "$TODO" "$TODO".backup
 542                 git_editor "$TODO" ||
 543                         die "Could not execute editor"
 544
 545                 has_action "$TODO" ||
 546                         die_abort "Nothing to do"
 547
 548                 output git checkout $ONTO && do_rest
 549                 ;;
 550         esac
 551         shift
 552 done