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