git-rebase.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005 Junio C Hamano.
   4 #
   5
   6 USAGE='[--interactive | -i] [--exec | -x <cmd>] [-v] [--force-rebase | -f]
   7        [--no-ff] [--onto <newbase>] [<upstream>|--root] [<branch>] [--quiet | -q]'
   8 LONG_USAGE='git-rebase replaces <branch> with a new branch of the
   9 same name.  When the --onto option is provided the new branch starts
  10 out with a HEAD equal to <newbase>, otherwise it is equal to <upstream>
  11 It then attempts to create a new commit for each commit from the original
  12 <branch> that does not exist in the <upstream> branch.
  13
  14 It is possible that a merge failure will prevent this process from being
  15 completely automatic.  You will have to resolve any such merge failure
  16 and run git rebase --continue.  Another option is to bypass the commit
  17 that caused the merge failure with git rebase --skip.  To check out the
  18 original <branch> and remove the .git/rebase-apply working files, use the
  19 command git rebase --abort instead.
  20
  21 Note that if <branch> is not specified on the command line, the
  22 currently checked out branch is used.
  23
  24 Example:       git-rebase master~1 topic
  25
  26         A---B---C topic                   A'\''--B'\''--C'\'' topic
  27        /                   -->           /
  28   D---E---F---G master          D---E---F---G master
  29 '
  30
  31 SUBDIRECTORY_OK=Yes
  32 OPTIONS_KEEPDASHDASH=
  33 OPTIONS_SPEC="\
  34 git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] [<upstream>] [<branch>]
  35 git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] --root [<branch>]
  36 git-rebase [-i] --continue | --abort | --skip
  37 --
  38  Available options are
  39 v,verbose!         display a diffstat of what changed upstream
  40 q,quiet!           be quiet. implies --no-stat
  41 onto=!             rebase onto given branch instead of upstream
  42 p,preserve-merges! try to recreate merges instead of ignoring them
  43 s,strategy=!       use the given merge strategy
  44 no-ff!             cherry-pick all commits, even if unchanged
  45 m,merge!           use merging strategies to rebase
  46 i,interactive!     let the user edit the list of commits to rebase
  47 x,exec=!           add exec lines after each commit of the editable list
  48 k,keep-empty       preserve empty commits during rebase
  49 f,force-rebase!    force rebase even if branch is up to date
  50 X,strategy-option=! pass the argument through to the merge strategy
  51 stat!              display a diffstat of what changed upstream
  52 n,no-stat!         do not show diffstat of what changed upstream
  53 verify             allow pre-rebase hook to run
  54 rerere-autoupdate  allow rerere to update index with resolved conflicts
  55 root!              rebase all reachable commits up to the root(s)
  56 autosquash         move commits that begin with squash!/fixup! under -i
  57 committer-date-is-author-date! passed to 'git am'
  58 ignore-date!       passed to 'git am'
  59 whitespace=!       passed to 'git apply'
  60 ignore-whitespace! passed to 'git apply'
  61 C=!                passed to 'git apply'
  62  Actions:
  63 continue!          continue
  64 abort!             abort and check out the original branch
  65 skip!              skip current patch and continue
  66 "
  67 . git-sh-setup
  68 set_reflog_action rebase
  69 require_work_tree_exists
  70 cd_to_toplevel
  71
  72 LF='
  73 '
  74 ok_to_skip_pre_rebase=
  75 resolvemsg="
  76 When you have resolved this problem run \"git rebase --continue\".
  77 If you would prefer to skip this patch, instead run \"git rebase --skip\".
  78 To check out the original branch and stop rebasing run \"git rebase --abort\".
  79 "
  80 unset onto
  81 cmd=
  82 strategy=
  83 strategy_opts=
  84 do_merge=
  85 merge_dir="$GIT_DIR"/rebase-merge
  86 apply_dir="$GIT_DIR"/rebase-apply
  87 verbose=
  88 diffstat=
  89 test "$(git config --bool rebase.stat)" = true && diffstat=t
  90 git_am_opt=
  91 rebase_root=
  92 force_rebase=
  93 allow_rerere_autoupdate=
  94 # Non-empty if a rebase was in progress when 'git rebase' was invoked
  95 in_progress=
  96 # One of {am, merge, interactive}
  97 type=
  98 # One of {"$GIT_DIR"/rebase-apply, "$GIT_DIR"/rebase-merge}
  99 state_dir=
 100 # One of {'', continue, skip, abort}, as parsed from command line
 101 action=
 102 preserve_merges=
 103 autosquash=
 104 keep_empty=
 105 test "$(git config --bool rebase.autosquash)" = "true" && autosquash=t
 106
 107 read_basic_state () {
 108         head_name=$(cat "$state_dir"/head-name) &&
 109         onto=$(cat "$state_dir"/onto) &&
 110         # We always write to orig-head, but interactive rebase used to write to
 111         # head. Fall back to reading from head to cover for the case that the
 112         # user upgraded git with an ongoing interactive rebase.
 113         if test -f "$state_dir"/orig-head
 114         then
 115                 orig_head=$(cat "$state_dir"/orig-head)
 116         else
 117                 orig_head=$(cat "$state_dir"/head)
 118         fi &&
 119         GIT_QUIET=$(cat "$state_dir"/quiet) &&
 120         test -f "$state_dir"/verbose && verbose=t
 121         test -f "$state_dir"/strategy && strategy="$(cat "$state_dir"/strategy)"
 122         test -f "$state_dir"/strategy_opts &&
 123                 strategy_opts="$(cat "$state_dir"/strategy_opts)"
 124         test -f "$state_dir"/allow_rerere_autoupdate &&
 125                 allow_rerere_autoupdate="$(cat "$state_dir"/allow_rerere_autoupdate)"
 126 }
 127
 128 write_basic_state () {
 129         echo "$head_name" > "$state_dir"/head-name &&
 130         echo "$onto" > "$state_dir"/onto &&
 131         echo "$orig_head" > "$state_dir"/orig-head &&
 132         echo "$GIT_QUIET" > "$state_dir"/quiet &&
 133         test t = "$verbose" && : > "$state_dir"/verbose
 134         test -n "$strategy" && echo "$strategy" > "$state_dir"/strategy
 135         test -n "$strategy_opts" && echo "$strategy_opts" > \
 136                 "$state_dir"/strategy_opts
 137         test -n "$allow_rerere_autoupdate" && echo "$allow_rerere_autoupdate" > \
 138                 "$state_dir"/allow_rerere_autoupdate
 139 }
 140
 141 output () {
 142         case "$verbose" in
 143         '')
 144                 output=$("$@" 2>&1 )
 145                 status=$?
 146                 test $status != 0 && printf "%s\n" "$output"
 147                 return $status
 148                 ;;
 149         *)
 150                 "$@"
 151                 ;;
 152         esac
 153 }
 154
 155 move_to_original_branch () {
 156         case "$head_name" in
 157         refs/*)
 158                 message="rebase finished: $head_name onto $onto"
 159                 git update-ref -m "$message" \
 160                         $head_name $(git rev-parse HEAD) $orig_head &&
 161                 git symbolic-ref \
 162                         -m "rebase finished: returning to $head_name" \
 163                         HEAD $head_name ||
 164                 die "Could not move back to $head_name"
 165                 ;;
 166         esac
 167 }
 168
 169 run_specific_rebase () {
 170         if [ "$interactive_rebase" = implied ]; then
 171                 GIT_EDITOR=:
 172                 export GIT_EDITOR
 173                 autosquash=
 174         fi
 175         . git-rebase--$type
 176 }
 177
 178 run_pre_rebase_hook () {
 179         if test -z "$ok_to_skip_pre_rebase" &&
 180            test -x "$GIT_DIR/hooks/pre-rebase"
 181         then
 182                 "$GIT_DIR/hooks/pre-rebase" ${1+"$@"} ||
 183                 die "The pre-rebase hook refused to rebase."
 184         fi
 185 }
 186
 187 test -f "$apply_dir"/applying &&
 188         die 'It looks like git-am is in progress. Cannot rebase.'
 189
 190 if test -d "$apply_dir"
 191 then
 192         type=am
 193         state_dir="$apply_dir"
 194 elif test -d "$merge_dir"
 195 then
 196         if test -f "$merge_dir"/interactive
 197         then
 198                 type=interactive
 199                 interactive_rebase=explicit
 200         else
 201                 type=merge
 202         fi
 203         state_dir="$merge_dir"
 204 fi
 205 test -n "$type" && in_progress=t
 206
 207 total_argc=$#
 208 while test $# != 0
 209 do
 210         case "$1" in
 211         --no-verify)
 212                 ok_to_skip_pre_rebase=yes
 213                 ;;
 214         --verify)
 215                 ok_to_skip_pre_rebase=
 216                 ;;
 217         --continue|--skip|--abort)
 218                 test $total_argc -eq 2 || usage
 219                 action=${1##--}
 220                 ;;
 221         --onto)
 222                 test 2 -le "$#" || usage
 223                 onto="$2"
 224                 shift
 225                 ;;
 226         -x)
 227                 test 2 -le "$#" || usage
 228                 cmd="${cmd}exec $2${LF}"
 229                 shift
 230                 ;;
 231         -i)
 232                 interactive_rebase=explicit
 233                 ;;
 234         -k)
 235                 keep_empty=yes
 236                 ;;
 237         -p)
 238                 preserve_merges=t
 239                 test -z "$interactive_rebase" && interactive_rebase=implied
 240                 ;;
 241         --autosquash)
 242                 autosquash=t
 243                 ;;
 244         --no-autosquash)
 245                 autosquash=
 246                 ;;
 247         -M|-m)
 248                 do_merge=t
 249                 ;;
 250         -X)
 251                 shift
 252                 strategy_opts="$strategy_opts $(git rev-parse --sq-quote "--$1")"
 253                 do_merge=t
 254                 test -z "$strategy" && strategy=recursive
 255                 ;;
 256         -s)
 257                 shift
 258                 strategy="$1"
 259                 do_merge=t
 260                 ;;
 261         -n)
 262                 diffstat=
 263                 ;;
 264         --stat)
 265                 diffstat=t
 266                 ;;
 267         -v)
 268                 verbose=t
 269                 diffstat=t
 270                 GIT_QUIET=
 271                 ;;
 272         -q)
 273                 GIT_QUIET=t
 274                 git_am_opt="$git_am_opt -q"
 275                 verbose=
 276                 diffstat=
 277                 ;;
 278         --whitespace)
 279                 shift
 280                 git_am_opt="$git_am_opt --whitespace=$1"
 281                 case "$1" in
 282                 fix|strip)
 283                         force_rebase=t
 284                         ;;
 285                 esac
 286                 ;;
 287         --ignore-whitespace)
 288                 git_am_opt="$git_am_opt $1"
 289                 ;;
 290         --committer-date-is-author-date|--ignore-date)
 291                 git_am_opt="$git_am_opt $1"
 292                 force_rebase=t
 293                 ;;
 294         -C)
 295                 shift
 296                 git_am_opt="$git_am_opt -C$1"
 297                 ;;
 298         --root)
 299                 rebase_root=t
 300                 ;;
 301         -f|--no-ff)
 302                 force_rebase=t
 303                 ;;
 304         --rerere-autoupdate|--no-rerere-autoupdate)
 305                 allow_rerere_autoupdate="$1"
 306                 ;;
 307         --)
 308                 shift
 309                 break
 310                 ;;
 311         esac
 312         shift
 313 done
 314 test $# -gt 2 && usage
 315
 316 if test -n "$cmd" &&
 317    test "$interactive_rebase" != explicit
 318 then
 319         die "--exec option must be used with --interactive option"
 320 fi
 321
 322 if test -n "$action"
 323 then
 324         test -z "$in_progress" && die "No rebase in progress?"
 325         # Only interactive rebase uses detailed reflog messages
 326         if test "$type" = interactive && test "$GIT_REFLOG_ACTION" = rebase
 327         then
 328                 GIT_REFLOG_ACTION="rebase -i ($action)"
 329                 export GIT_REFLOG_ACTION
 330         fi
 331 fi
 332
 333 case "$action" in
 334 continue)
 335         # Sanity check
 336         git rev-parse --verify HEAD >/dev/null ||
 337                 die "Cannot read HEAD"
 338         git update-index --ignore-submodules --refresh &&
 339         git diff-files --quiet --ignore-submodules || {
 340                 echo "You must edit all merge conflicts and then"
 341                 echo "mark them as resolved using git add"
 342                 exit 1
 343         }
 344         read_basic_state
 345         run_specific_rebase
 346         ;;
 347 skip)
 348         output git reset --hard HEAD || exit $?
 349         read_basic_state
 350         run_specific_rebase
 351         ;;
 352 abort)
 353         git rerere clear
 354         read_basic_state
 355         case "$head_name" in
 356         refs/*)
 357                 git symbolic-ref -m "rebase: aborting" HEAD $head_name ||
 358                 die "Could not move back to $head_name"
 359                 ;;
 360         esac
 361         output git reset --hard $orig_head
 362         rm -r "$state_dir"
 363         exit
 364         ;;
 365 esac
 366
 367 # Make sure no rebase is in progress
 368 if test -n "$in_progress"
 369 then
 370         die '
 371 It seems that there is already a '"${state_dir##*/}"' directory, and
 372 I wonder if you are in the middle of another rebase.  If that is the
 373 case, please try
 374         git rebase (--continue | --abort | --skip)
 375 If that is not the case, please
 376         rm -fr '"$state_dir"'
 377 and run me again.  I am stopping in case you still have something
 378 valuable there.'
 379 fi
 380
 381 if test -n "$rebase_root" && test -z "$onto"
 382 then
 383         test -z "$interactive_rebase" && interactive_rebase=implied
 384 fi
 385
 386 if test -n "$interactive_rebase"
 387 then
 388         type=interactive
 389         state_dir="$merge_dir"
 390 elif test -n "$do_merge"
 391 then
 392         type=merge
 393         state_dir="$merge_dir"
 394 else
 395         type=am
 396         state_dir="$apply_dir"
 397 fi
 398
 399 if test -z "$rebase_root"
 400 then
 401         case "$#" in
 402         0)
 403                 if ! upstream_name=$(git rev-parse --symbolic-full-name \
 404                         --verify -q @{upstream} 2>/dev/null)
 405                 then
 406                         . git-parse-remote
 407                         error_on_missing_default_upstream "rebase" "rebase" \
 408                                 "against" "git rebase <branch>"
 409                 fi
 410                 ;;
 411         *)      upstream_name="$1"
 412                 shift
 413                 ;;
 414         esac
 415         upstream=`git rev-parse --verify "${upstream_name}^0"` ||
 416         die "invalid upstream $upstream_name"
 417         upstream_arg="$upstream_name"
 418 else
 419         if test -z "$onto"
 420         then
 421                 empty_tree=`git hash-object -t tree /dev/null`
 422                 onto=`git commit-tree $empty_tree </dev/null`
 423                 squash_onto="$onto"
 424         fi
 425         unset upstream_name
 426         unset upstream
 427         test $# -gt 1 && usage
 428         upstream_arg=--root
 429 fi
 430
 431 # Make sure the branch to rebase onto is valid.
 432 onto_name=${onto-"$upstream_name"}
 433 case "$onto_name" in
 434 *...*)
 435         if      left=${onto_name%...*} right=${onto_name#*...} &&
 436                 onto=$(git merge-base --all ${left:-HEAD} ${right:-HEAD})
 437         then
 438                 case "$onto" in
 439                 ?*"$LF"?*)
 440                         die "$onto_name: there are more than one merge bases"
 441                         ;;
 442                 '')
 443                         die "$onto_name: there is no merge base"
 444                         ;;
 445                 esac
 446         else
 447                 die "$onto_name: there is no merge base"
 448         fi
 449         ;;
 450 *)
 451         onto=$(git rev-parse --verify "${onto_name}^0") ||
 452         die "Does not point to a valid commit: $onto_name"
 453         ;;
 454 esac
 455
 456 # If the branch to rebase is given, that is the branch we will rebase
 457 # $branch_name -- branch being rebased, or HEAD (already detached)
 458 # $orig_head -- commit object name of tip of the branch before rebasing
 459 # $head_name -- refs/heads/<that-branch> or "detached HEAD"
 460 switch_to=
 461 case "$#" in
 462 1)
 463         # Is it "rebase other $branchname" or "rebase other $commit"?
 464         branch_name="$1"
 465         switch_to="$1"
 466
 467         if git show-ref --verify --quiet -- "refs/heads/$1" &&
 468            orig_head=$(git rev-parse -q --verify "refs/heads/$1")
 469         then
 470                 head_name="refs/heads/$1"
 471         elif orig_head=$(git rev-parse -q --verify "$1")
 472         then
 473                 head_name="detached HEAD"
 474         else
 475                 die "fatal: no such branch: $1"
 476         fi
 477         ;;
 478 0)
 479         # Do not need to switch branches, we are already on it.
 480         if branch_name=`git symbolic-ref -q HEAD`
 481         then
 482                 head_name=$branch_name
 483                 branch_name=`expr "z$branch_name" : 'zrefs/heads/\(.*\)'`
 484         else
 485                 head_name="detached HEAD"
 486                 branch_name=HEAD ;# detached
 487         fi
 488         orig_head=$(git rev-parse --verify "${branch_name}^0") || exit
 489         ;;
 490 *)
 491         die "BUG: unexpected number of arguments left to parse"
 492         ;;
 493 esac
 494
 495 require_clean_work_tree "rebase" "Please commit or stash them."
 496
 497 # Now we are rebasing commits $upstream..$orig_head (or with --root,
 498 # everything leading up to $orig_head) on top of $onto
 499
 500 # Check if we are already based on $onto with linear history,
 501 # but this should be done only when upstream and onto are the same
 502 # and if this is not an interactive rebase.
 503 mb=$(git merge-base "$onto" "$orig_head")
 504 if test "$type" != interactive && test "$upstream" = "$onto" &&
 505         test "$mb" = "$onto" &&
 506         # linear history?
 507         ! (git rev-list --parents "$onto".."$orig_head" | sane_grep " .* ") > /dev/null
 508 then
 509         if test -z "$force_rebase"
 510         then
 511                 # Lazily switch to the target branch if needed...
 512                 test -z "$switch_to" || git checkout "$switch_to" --
 513                 say "Current branch $branch_name is up to date."
 514                 exit 0
 515         else
 516                 say "Current branch $branch_name is up to date, rebase forced."
 517         fi
 518 fi
 519
 520 # If a hook exists, give it a chance to interrupt
 521 run_pre_rebase_hook "$upstream_arg" "$@"
 522
 523 if test -n "$diffstat"
 524 then
 525         if test -n "$verbose"
 526         then
 527                 echo "Changes from $mb to $onto:"
 528         fi
 529         # We want color (if set), but no pager
 530         GIT_PAGER='' git diff --stat --summary "$mb" "$onto"
 531 fi
 532
 533 test "$type" = interactive && run_specific_rebase
 534
 535 # Detach HEAD and reset the tree
 536 say "First, rewinding head to replay your work on top of it..."
 537 git checkout -q "$onto^0" || die "could not detach HEAD"
 538 git update-ref ORIG_HEAD $orig_head
 539
 540 # If the $onto is a proper descendant of the tip of the branch, then
 541 # we just fast-forwarded.
 542 if test "$mb" = "$orig_head"
 543 then
 544         say "Fast-forwarded $branch_name to $onto_name."
 545         move_to_original_branch
 546         exit 0
 547 fi
 548
 549 if test -n "$rebase_root"
 550 then
 551         revisions="$onto..$orig_head"
 552 else
 553         revisions="$upstream..$orig_head"
 554 fi
 555
 556 run_specific_rebase