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