git-rebase.sh

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