git-rebase.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005 Junio C Hamano.
   4 #
   5
   6 SUBDIRECTORY_OK=Yes
   7 OPTIONS_KEEPDASHDASH=
   8 OPTIONS_SPEC="\
   9 git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] [<upstream>] [<branch>]
  10 git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] --root [<branch>]
  11 git-rebase --continue | --abort | --skip
  12 --
  13  Available options are
  14 v,verbose!         display a diffstat of what changed upstream
  15 q,quiet!           be quiet. implies --no-stat
  16 onto=!             rebase onto given branch instead of upstream
  17 p,preserve-merges! try to recreate merges instead of ignoring them
  18 s,strategy=!       use the given merge strategy
  19 no-ff!             cherry-pick all commits, even if unchanged
  20 m,merge!           use merging strategies to rebase
  21 i,interactive!     let the user edit the list of commits to rebase
  22 x,exec=!           add exec lines after each commit of the editable list
  23 k,keep-empty       preserve empty commits during rebase
  24 f,force-rebase!    force rebase even if branch is up to date
  25 X,strategy-option=! pass the argument through to the merge strategy
  26 stat!              display a diffstat of what changed upstream
  27 n,no-stat!         do not show diffstat of what changed upstream
  28 verify             allow pre-rebase hook to run
  29 rerere-autoupdate  allow rerere to update index with resolved conflicts
  30 root!              rebase all reachable commits up to the root(s)
  31 autosquash         move commits that begin with squash!/fixup! under -i
  32 committer-date-is-author-date! passed to 'git am'
  33 ignore-date!       passed to 'git am'
  34 whitespace=!       passed to 'git apply'
  35 ignore-whitespace! passed to 'git apply'
  36 C=!                passed to 'git apply'
  37  Actions:
  38 continue!          continue
  39 abort!             abort and check out the original branch
  40 skip!              skip current patch and continue
  41 "
  42 . git-sh-setup
  43 . git-sh-i18n
  44 set_reflog_action rebase
  45 require_work_tree_exists
  46 cd_to_toplevel
  47
  48 LF='
  49 '
  50 ok_to_skip_pre_rebase=
  51 resolvemsg="
  52 $(gettext 'When you have resolved this problem, run "git rebase --continue".
  53 If you prefer to skip this patch, run "git rebase --skip" instead.
  54 To check out the original branch and stop rebasing, run "git rebase --abort".')
  55 "
  56 unset onto
  57 cmd=
  58 strategy=
  59 strategy_opts=
  60 do_merge=
  61 merge_dir="$GIT_DIR"/rebase-merge
  62 apply_dir="$GIT_DIR"/rebase-apply
  63 verbose=
  64 diffstat=
  65 test "$(git config --bool rebase.stat)" = true && diffstat=t
  66 git_am_opt=
  67 rebase_root=
  68 force_rebase=
  69 allow_rerere_autoupdate=
  70 # Non-empty if a rebase was in progress when 'git rebase' was invoked
  71 in_progress=
  72 # One of {am, merge, interactive}
  73 type=
  74 # One of {"$GIT_DIR"/rebase-apply, "$GIT_DIR"/rebase-merge}
  75 state_dir=
  76 # One of {'', continue, skip, abort}, as parsed from command line
  77 action=
  78 preserve_merges=
  79 autosquash=
  80 keep_empty=
  81 test "$(git config --bool rebase.autosquash)" = "true" && autosquash=t
  82
  83 read_basic_state () {
  84         head_name=$(cat "$state_dir"/head-name) &&
  85         onto=$(cat "$state_dir"/onto) &&
  86         # We always write to orig-head, but interactive rebase used to write to
  87         # head. Fall back to reading from head to cover for the case that the
  88         # user upgraded git with an ongoing interactive rebase.
  89         if test -f "$state_dir"/orig-head
  90         then
  91                 orig_head=$(cat "$state_dir"/orig-head)
  92         else
  93                 orig_head=$(cat "$state_dir"/head)
  94         fi &&
  95         GIT_QUIET=$(cat "$state_dir"/quiet) &&
  96         test -f "$state_dir"/verbose && verbose=t
  97         test -f "$state_dir"/strategy && strategy="$(cat "$state_dir"/strategy)"
  98         test -f "$state_dir"/strategy_opts &&
  99                 strategy_opts="$(cat "$state_dir"/strategy_opts)"
 100         test -f "$state_dir"/allow_rerere_autoupdate &&
 101                 allow_rerere_autoupdate="$(cat "$state_dir"/allow_rerere_autoupdate)"
 102 }
 103
 104 write_basic_state () {
 105         echo "$head_name" > "$state_dir"/head-name &&
 106         echo "$onto" > "$state_dir"/onto &&
 107         echo "$orig_head" > "$state_dir"/orig-head &&
 108         echo "$GIT_QUIET" > "$state_dir"/quiet &&
 109         test t = "$verbose" && : > "$state_dir"/verbose
 110         test -n "$strategy" && echo "$strategy" > "$state_dir"/strategy
 111         test -n "$strategy_opts" && echo "$strategy_opts" > \
 112                 "$state_dir"/strategy_opts
 113         test -n "$allow_rerere_autoupdate" && echo "$allow_rerere_autoupdate" > \
 114                 "$state_dir"/allow_rerere_autoupdate
 115 }
 116
 117 output () {
 118         case "$verbose" in
 119         '')
 120                 output=$("$@" 2>&1 )
 121                 status=$?
 122                 test $status != 0 && printf "%s\n" "$output"
 123                 return $status
 124                 ;;
 125         *)
 126                 "$@"
 127                 ;;
 128         esac
 129 }
 130
 131 move_to_original_branch () {
 132         case "$head_name" in
 133         refs/*)
 134                 message="rebase finished: $head_name onto $onto"
 135                 git update-ref -m "$message" \
 136                         $head_name $(git rev-parse HEAD) $orig_head &&
 137                 git symbolic-ref \
 138                         -m "rebase finished: returning to $head_name" \
 139                         HEAD $head_name ||
 140                 die "$(gettext "Could not move back to $head_name")"
 141                 ;;
 142         esac
 143 }
 144
 145 run_specific_rebase () {
 146         if [ "$interactive_rebase" = implied ]; then
 147                 GIT_EDITOR=:
 148                 export GIT_EDITOR
 149                 autosquash=
 150         fi
 151         . git-rebase--$type
 152 }
 153
 154 run_pre_rebase_hook () {
 155         if test -z "$ok_to_skip_pre_rebase" &&
 156            test -x "$GIT_DIR/hooks/pre-rebase"
 157         then
 158                 "$GIT_DIR/hooks/pre-rebase" ${1+"$@"} ||
 159                 die "$(gettext "The pre-rebase hook refused to rebase.")"
 160         fi
 161 }
 162
 163 test -f "$apply_dir"/applying &&
 164         die "$(gettext "It looks like git-am is in progress. Cannot rebase.")"
 165
 166 if test -d "$apply_dir"
 167 then
 168         type=am
 169         state_dir="$apply_dir"
 170 elif test -d "$merge_dir"
 171 then
 172         if test -f "$merge_dir"/interactive
 173         then
 174                 type=interactive
 175                 interactive_rebase=explicit
 176         else
 177                 type=merge
 178         fi
 179         state_dir="$merge_dir"
 180 fi
 181 test -n "$type" && in_progress=t
 182
 183 total_argc=$#
 184 while test $# != 0
 185 do
 186         case "$1" in
 187         --no-verify)
 188                 ok_to_skip_pre_rebase=yes
 189                 ;;
 190         --verify)
 191                 ok_to_skip_pre_rebase=
 192                 ;;
 193         --continue|--skip|--abort)
 194                 test $total_argc -eq 2 || usage
 195                 action=${1##--}
 196                 ;;
 197         --onto)
 198                 test 2 -le "$#" || usage
 199                 onto="$2"
 200                 shift
 201                 ;;
 202         -x)
 203                 test 2 -le "$#" || usage
 204                 cmd="${cmd}exec $2${LF}"
 205                 shift
 206                 ;;
 207         -i)
 208                 interactive_rebase=explicit
 209                 ;;
 210         -k)
 211                 keep_empty=yes
 212                 ;;
 213         -p)
 214                 preserve_merges=t
 215                 test -z "$interactive_rebase" && interactive_rebase=implied
 216                 ;;
 217         --autosquash)
 218                 autosquash=t
 219                 ;;
 220         --no-autosquash)
 221                 autosquash=
 222                 ;;
 223         -M|-m)
 224                 do_merge=t
 225                 ;;
 226         -X)
 227                 shift
 228                 strategy_opts="$strategy_opts $(git rev-parse --sq-quote "--$1")"
 229                 do_merge=t
 230                 test -z "$strategy" && strategy=recursive
 231                 ;;
 232         -s)
 233                 shift
 234                 strategy="$1"
 235                 do_merge=t
 236                 ;;
 237         -n)
 238                 diffstat=
 239                 ;;
 240         --stat)
 241                 diffstat=t
 242                 ;;
 243         -v)
 244                 verbose=t
 245                 diffstat=t
 246                 GIT_QUIET=
 247                 ;;
 248         -q)
 249                 GIT_QUIET=t
 250                 git_am_opt="$git_am_opt -q"
 251                 verbose=
 252                 diffstat=
 253                 ;;
 254         --whitespace)
 255                 shift
 256                 git_am_opt="$git_am_opt --whitespace=$1"
 257                 case "$1" in
 258                 fix|strip)
 259                         force_rebase=t
 260                         ;;
 261                 esac
 262                 ;;
 263         --ignore-whitespace)
 264                 git_am_opt="$git_am_opt $1"
 265                 ;;
 266         --committer-date-is-author-date|--ignore-date)
 267                 git_am_opt="$git_am_opt $1"
 268                 force_rebase=t
 269                 ;;
 270         -C)
 271                 shift
 272                 git_am_opt="$git_am_opt -C$1"
 273                 ;;
 274         --root)
 275                 rebase_root=t
 276                 ;;
 277         -f|--no-ff)
 278                 force_rebase=t
 279                 ;;
 280         --rerere-autoupdate|--no-rerere-autoupdate)
 281                 allow_rerere_autoupdate="$1"
 282                 ;;
 283         --)
 284                 shift
 285                 break
 286                 ;;
 287         esac
 288         shift
 289 done
 290 test $# -gt 2 && usage
 291
 292 if test -n "$cmd" &&
 293    test "$interactive_rebase" != explicit
 294 then
 295         die "$(gettext "The --exec option must be used with the --interactive option")"
 296 fi
 297
 298 if test -n "$action"
 299 then
 300         test -z "$in_progress" && die "$(gettext "No rebase in progress?")"
 301         # Only interactive rebase uses detailed reflog messages
 302         if test "$type" = interactive && test "$GIT_REFLOG_ACTION" = rebase
 303         then
 304                 GIT_REFLOG_ACTION="rebase -i ($action)"
 305                 export GIT_REFLOG_ACTION
 306         fi
 307 fi
 308
 309 case "$action" in
 310 continue)
 311         # Sanity check
 312         git rev-parse --verify HEAD >/dev/null ||
 313                 die "$(gettext "Cannot read HEAD")"
 314         git update-index --ignore-submodules --refresh &&
 315         git diff-files --quiet --ignore-submodules || {
 316                 echo "$(gettext "You must edit all merge conflicts and then
 317 mark them as resolved using git add")"
 318                 exit 1
 319         }
 320         read_basic_state
 321         run_specific_rebase
 322         ;;
 323 skip)
 324         output git reset --hard HEAD || exit $?
 325         read_basic_state
 326         run_specific_rebase
 327         ;;
 328 abort)
 329         git rerere clear
 330         read_basic_state
 331         case "$head_name" in
 332         refs/*)
 333                 git symbolic-ref -m "rebase: aborting" HEAD $head_name ||
 334                 die "$(eval_gettext "Could not move back to \$head_name")"
 335                 ;;
 336         esac
 337         output git reset --hard $orig_head
 338         rm -r "$state_dir"
 339         exit
 340         ;;
 341 esac
 342
 343 # Make sure no rebase is in progress
 344 if test -n "$in_progress"
 345 then
 346         state_dir_base=${state_dir##*/}
 347         cmd_live_rebase="git rebase (--continue | --abort | --skip)"
 348         cmd_clear_stale_rebase="rm -fr \"$state_dir\""
 349         die "
 350 $(eval_gettext 'It seems that there is already a $state_dir_base directory, and
 351 I wonder if you are in the middle of another rebase.  If that is the
 352 case, please try
 353         $cmd_live_rebase
 354 If that is not the case, please
 355         $cmd_clear_stale_rebase
 356 and run me again.  I am stopping in case you still have something
 357 valuable there.')"
 358 fi
 359
 360 if test -n "$rebase_root" && test -z "$onto"
 361 then
 362         test -z "$interactive_rebase" && interactive_rebase=implied
 363 fi
 364
 365 if test -n "$interactive_rebase"
 366 then
 367         type=interactive
 368         state_dir="$merge_dir"
 369 elif test -n "$do_merge"
 370 then
 371         type=merge
 372         state_dir="$merge_dir"
 373 else
 374         type=am
 375         state_dir="$apply_dir"
 376 fi
 377
 378 if test -z "$rebase_root"
 379 then
 380         case "$#" in
 381         0)
 382                 if ! upstream_name=$(git rev-parse --symbolic-full-name \
 383                         --verify -q @{upstream} 2>/dev/null)
 384                 then
 385                         . git-parse-remote
 386                         error_on_missing_default_upstream "rebase" "rebase" \
 387                                 "against" "git rebase <branch>"
 388                 fi
 389                 ;;
 390         *)      upstream_name="$1"
 391                 shift
 392                 ;;
 393         esac
 394         upstream=`git rev-parse --verify "${upstream_name}^0"` ||
 395         die "$(eval_gettext "invalid upstream \$upstream_name")"
 396         upstream_arg="$upstream_name"
 397 else
 398         if test -z "$onto"
 399         then
 400                 empty_tree=`git hash-object -t tree /dev/null`
 401                 onto=`git commit-tree $empty_tree </dev/null`
 402                 squash_onto="$onto"
 403         fi
 404         unset upstream_name
 405         unset upstream
 406         test $# -gt 1 && usage
 407         upstream_arg=--root
 408 fi
 409
 410 # Make sure the branch to rebase onto is valid.
 411 onto_name=${onto-"$upstream_name"}
 412 case "$onto_name" in
 413 *...*)
 414         if      left=${onto_name%...*} right=${onto_name#*...} &&
 415                 onto=$(git merge-base --all ${left:-HEAD} ${right:-HEAD})
 416         then
 417                 case "$onto" in
 418                 ?*"$LF"?*)
 419                         die "$(eval_gettext "\$onto_name: there are more than one merge bases")"
 420                         ;;
 421                 '')
 422                         die "$(eval_gettext "\$onto_name: there is no merge base")"
 423                         ;;
 424                 esac
 425         else
 426                 die "$(eval_gettext "\$onto_name: there is no merge base")"
 427         fi
 428         ;;
 429 *)
 430         onto=$(git rev-parse --verify "${onto_name}^0") ||
 431         die "$(eval_gettext "Does not point to a valid commit: \$onto_name")"
 432         ;;
 433 esac
 434
 435 # If the branch to rebase is given, that is the branch we will rebase
 436 # $branch_name -- branch being rebased, or HEAD (already detached)
 437 # $orig_head -- commit object name of tip of the branch before rebasing
 438 # $head_name -- refs/heads/<that-branch> or "detached HEAD"
 439 switch_to=
 440 case "$#" in
 441 1)
 442         # Is it "rebase other $branchname" or "rebase other $commit"?
 443         branch_name="$1"
 444         switch_to="$1"
 445
 446         if git show-ref --verify --quiet -- "refs/heads/$1" &&
 447            orig_head=$(git rev-parse -q --verify "refs/heads/$1")
 448         then
 449                 head_name="refs/heads/$1"
 450         elif orig_head=$(git rev-parse -q --verify "$1")
 451         then
 452                 head_name="detached HEAD"
 453         else
 454                 die "$(eval_gettext "fatal: no such branch: \$branch_name")"
 455         fi
 456         ;;
 457 0)
 458         # Do not need to switch branches, we are already on it.
 459         if branch_name=`git symbolic-ref -q HEAD`
 460         then
 461                 head_name=$branch_name
 462                 branch_name=`expr "z$branch_name" : 'zrefs/heads/\(.*\)'`
 463         else
 464                 head_name="detached HEAD"
 465                 branch_name=HEAD ;# detached
 466         fi
 467         orig_head=$(git rev-parse --verify "${branch_name}^0") || exit
 468         ;;
 469 *)
 470         die "BUG: unexpected number of arguments left to parse"
 471         ;;
 472 esac
 473
 474 require_clean_work_tree "rebase" "$(gettext "Please commit or stash them.")"
 475
 476 # Now we are rebasing commits $upstream..$orig_head (or with --root,
 477 # everything leading up to $orig_head) on top of $onto
 478
 479 # Check if we are already based on $onto with linear history,
 480 # but this should be done only when upstream and onto are the same
 481 # and if this is not an interactive rebase.
 482 mb=$(git merge-base "$onto" "$orig_head")
 483 if test "$type" != interactive && test "$upstream" = "$onto" &&
 484         test "$mb" = "$onto" &&
 485         # linear history?
 486         ! (git rev-list --parents "$onto".."$orig_head" | sane_grep " .* ") > /dev/null
 487 then
 488         if test -z "$force_rebase"
 489         then
 490                 # Lazily switch to the target branch if needed...
 491                 test -z "$switch_to" || git checkout "$switch_to" --
 492                 say "$(eval_gettext "Current branch \$branch_name is up to date.")"
 493                 exit 0
 494         else
 495                 say "$(eval_gettext "Current branch \$branch_name is up to date, rebase forced.")"
 496         fi
 497 fi
 498
 499 # If a hook exists, give it a chance to interrupt
 500 run_pre_rebase_hook "$upstream_arg" "$@"
 501
 502 if test -n "$diffstat"
 503 then
 504         if test -n "$verbose"
 505         then
 506                 echo "$(eval_gettext "Changes from \$mb to \$onto:")"
 507         fi
 508         # We want color (if set), but no pager
 509         GIT_PAGER='' git diff --stat --summary "$mb" "$onto"
 510 fi
 511
 512 test "$type" = interactive && run_specific_rebase
 513
 514 # Detach HEAD and reset the tree
 515 say "$(gettext "First, rewinding head to replay your work on top of it...")"
 516 git checkout -q "$onto^0" || die "could not detach HEAD"
 517 git update-ref ORIG_HEAD $orig_head
 518
 519 # If the $onto is a proper descendant of the tip of the branch, then
 520 # we just fast-forwarded.
 521 if test "$mb" = "$orig_head"
 522 then
 523         say "$(eval_gettext "Fast-forwarded \$branch_name to \$onto_name.")"
 524         move_to_original_branch
 525         exit 0
 526 fi
 527
 528 if test -n "$rebase_root"
 529 then
 530         revisions="$onto..$orig_head"
 531 else
 532         revisions="$upstream..$orig_head"
 533 fi
 534
 535 run_specific_rebase