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