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