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 restore 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_SPEC=
  32 . git-sh-setup
  33 set_reflog_action rebase
  34 require_work_tree
  35 cd_to_toplevel
  36
  37 LF='
  38 '
  39 OK_TO_SKIP_PRE_REBASE=
  40 RESOLVEMSG="
  41 When you have resolved this problem run \"git rebase --continue\".
  42 If you would prefer to skip this patch, instead run \"git rebase --skip\".
  43 To restore the original branch and stop rebasing run \"git rebase --abort\".
  44 "
  45 unset newbase
  46 strategy=recursive
  47 strategy_opts=
  48 do_merge=
  49 merge_dir="$GIT_DIR"/rebase-merge
  50 apply_dir="$GIT_DIR"/rebase-apply
  51 prec=4
  52 verbose=
  53 diffstat=
  54 test "$(git config --bool rebase.stat)" = true && diffstat=t
  55 git_am_opt=
  56 rebase_root=
  57 force_rebase=
  58 allow_rerere_autoupdate=
  59
  60 read_state () {
  61         if test -d "$merge_dir"
  62         then
  63                 state_dir="$merge_dir"
  64                 prev_head=$(cat "$merge_dir"/prev_head) &&
  65                 onto_name=$(cat "$merge_dir"/onto_name) &&
  66                 end=$(cat "$merge_dir"/end) &&
  67                 msgnum=$(cat "$merge_dir"/msgnum)
  68         else
  69                 state_dir="$apply_dir"
  70         fi &&
  71         head_name=$(cat "$state_dir"/head-name) &&
  72         onto=$(cat "$state_dir"/onto) &&
  73         orig_head=$(cat "$state_dir"/orig-head) &&
  74         GIT_QUIET=$(cat "$state_dir"/quiet)
  75 }
  76
  77 continue_merge () {
  78         test -n "$prev_head" || die "prev_head must be defined"
  79         test -d "$merge_dir" || die "$merge_dir directory does not exist"
  80
  81         unmerged=$(git ls-files -u)
  82         if test -n "$unmerged"
  83         then
  84                 echo "You still have unmerged paths in your index"
  85                 echo "did you forget to use git add?"
  86                 die "$RESOLVEMSG"
  87         fi
  88
  89         cmt=`cat "$merge_dir/current"`
  90         if ! git diff-index --quiet --ignore-submodules HEAD --
  91         then
  92                 if ! git commit --no-verify -C "$cmt"
  93                 then
  94                         echo "Commit failed, please do not call \"git commit\""
  95                         echo "directly, but instead do one of the following: "
  96                         die "$RESOLVEMSG"
  97                 fi
  98                 if test -z "$GIT_QUIET"
  99                 then
 100                         printf "Committed: %0${prec}d " $msgnum
 101                 fi
 102                 echo "$cmt $(git rev-parse HEAD^0)" >> "$merge_dir/rewritten"
 103         else
 104                 if test -z "$GIT_QUIET"
 105                 then
 106                         printf "Already applied: %0${prec}d " $msgnum
 107                 fi
 108         fi
 109         test -z "$GIT_QUIET" &&
 110         GIT_PAGER='' git log --format=%s -1 "$cmt"
 111
 112         prev_head=`git rev-parse HEAD^0`
 113         # save the resulting commit so we can read-tree on it later
 114         echo "$prev_head" > "$merge_dir/prev_head"
 115
 116         # onto the next patch:
 117         msgnum=$(($msgnum + 1))
 118         echo "$msgnum" >"$merge_dir/msgnum"
 119 }
 120
 121 call_merge () {
 122         cmt="$(cat "$merge_dir/cmt.$1")"
 123         echo "$cmt" > "$merge_dir/current"
 124         hd=$(git rev-parse --verify HEAD)
 125         cmt_name=$(git symbolic-ref HEAD 2> /dev/null || echo HEAD)
 126         msgnum=$(cat "$merge_dir/msgnum")
 127         eval GITHEAD_$cmt='"${cmt_name##refs/heads/}~$(($end - $msgnum))"'
 128         eval GITHEAD_$hd='$onto_name'
 129         export GITHEAD_$cmt GITHEAD_$hd
 130         if test -n "$GIT_QUIET"
 131         then
 132                 GIT_MERGE_VERBOSITY=1 && export GIT_MERGE_VERBOSITY
 133         fi
 134         eval 'git-merge-$strategy' $strategy_opts '"$cmt^" -- "$hd" "$cmt"'
 135         rv=$?
 136         case "$rv" in
 137         0)
 138                 unset GITHEAD_$cmt GITHEAD_$hd
 139                 return
 140                 ;;
 141         1)
 142                 git rerere $allow_rerere_autoupdate
 143                 die "$RESOLVEMSG"
 144                 ;;
 145         2)
 146                 echo "Strategy: $rv $strategy failed, try another" 1>&2
 147                 die "$RESOLVEMSG"
 148                 ;;
 149         *)
 150                 die "Unknown exit code ($rv) from command:" \
 151                         "git-merge-$strategy $cmt^ -- HEAD $cmt"
 152                 ;;
 153         esac
 154 }
 155
 156 move_to_original_branch () {
 157         case "$head_name" in
 158         refs/*)
 159                 message="rebase finished: $head_name onto $onto"
 160                 git update-ref -m "$message" \
 161                         $head_name $(git rev-parse HEAD) $orig_head &&
 162                 git symbolic-ref HEAD $head_name ||
 163                 die "Could not move back to $head_name"
 164                 ;;
 165         esac
 166 }
 167
 168 finish_rb_merge () {
 169         move_to_original_branch
 170         git notes copy --for-rewrite=rebase < "$merge_dir"/rewritten
 171         if test -x "$GIT_DIR"/hooks/post-rewrite &&
 172                 test -s "$merge_dir"/rewritten; then
 173                 "$GIT_DIR"/hooks/post-rewrite rebase < "$merge_dir"/rewritten
 174         fi
 175         rm -r "$merge_dir"
 176         say All done.
 177 }
 178
 179 is_interactive () {
 180         while test $# != 0
 181         do
 182                 case "$1" in
 183                         -i|--interactive)
 184                                 interactive_rebase=explicit
 185                                 break
 186                         ;;
 187                         -p|--preserve-merges)
 188                                 interactive_rebase=implied
 189                         ;;
 190                 esac
 191                 shift
 192         done
 193
 194         if [ "$interactive_rebase" = implied ]; then
 195                 GIT_EDITOR=:
 196                 export GIT_EDITOR
 197         fi
 198
 199         test -n "$interactive_rebase" || test -f "$merge_dir"/interactive
 200 }
 201
 202 run_pre_rebase_hook () {
 203         if test -z "$OK_TO_SKIP_PRE_REBASE" &&
 204            test -x "$GIT_DIR/hooks/pre-rebase"
 205         then
 206                 "$GIT_DIR/hooks/pre-rebase" ${1+"$@"} ||
 207                 die "The pre-rebase hook refused to rebase."
 208         fi
 209 }
 210
 211 test -f "$apply_dir"/applying &&
 212         die 'It looks like git-am is in progress. Cannot rebase.'
 213
 214 is_interactive "$@" && exec git-rebase--interactive "$@"
 215
 216 while test $# != 0
 217 do
 218         case "$1" in
 219         --no-verify)
 220                 OK_TO_SKIP_PRE_REBASE=yes
 221                 ;;
 222         --verify)
 223                 OK_TO_SKIP_PRE_REBASE=
 224                 ;;
 225         --continue)
 226                 test -d "$merge_dir" -o -d "$apply_dir" ||
 227                         die "No rebase in progress?"
 228
 229                 git update-index --ignore-submodules --refresh &&
 230                 git diff-files --quiet --ignore-submodules || {
 231                         echo "You must edit all merge conflicts and then"
 232                         echo "mark them as resolved using git add"
 233                         exit 1
 234                 }
 235                 read_state
 236                 if test -d "$merge_dir"
 237                 then
 238                         continue_merge
 239                         while test "$msgnum" -le "$end"
 240                         do
 241                                 call_merge "$msgnum"
 242                                 continue_merge
 243                         done
 244                         finish_rb_merge
 245                         exit
 246                 fi
 247                 git am --resolved --3way --resolvemsg="$RESOLVEMSG" &&
 248                 move_to_original_branch
 249                 exit
 250                 ;;
 251         --skip)
 252                 test -d "$merge_dir" -o -d "$apply_dir" ||
 253                         die "No rebase in progress?"
 254
 255                 git reset --hard HEAD || exit $?
 256                 read_state
 257                 if test -d "$merge_dir"
 258                 then
 259                         git rerere clear
 260                         msgnum=$(($msgnum + 1))
 261                         while test "$msgnum" -le "$end"
 262                         do
 263                                 call_merge "$msgnum"
 264                                 continue_merge
 265                         done
 266                         finish_rb_merge
 267                         exit
 268                 fi
 269                 git am -3 --skip --resolvemsg="$RESOLVEMSG" &&
 270                 move_to_original_branch
 271                 exit
 272                 ;;
 273         --abort)
 274                 test -d "$merge_dir" -o -d "$apply_dir" ||
 275                         die "No rebase in progress?"
 276
 277                 git rerere clear
 278                 read_state
 279                 case "$head_name" in
 280                 refs/*)
 281                         git symbolic-ref HEAD $head_name ||
 282                         die "Could not move back to $head_name"
 283                         ;;
 284                 esac
 285                 git reset --hard $orig_head
 286                 rm -r "$state_dir"
 287                 exit
 288                 ;;
 289         --onto)
 290                 test 2 -le "$#" || usage
 291                 newbase="$2"
 292                 shift
 293                 ;;
 294         -M|-m|--m|--me|--mer|--merg|--merge)
 295                 do_merge=t
 296                 ;;
 297         -X*|--strategy-option*)
 298                 case "$#,$1" in
 299                 1,-X|1,--strategy-option)
 300                         usage ;;
 301                 *,-X|*,--strategy-option)
 302                         newopt="$2"
 303                         shift ;;
 304                 *,--strategy-option=*)
 305                         newopt="$(expr " $1" : ' --strategy-option=\(.*\)')" ;;
 306                 *,-X*)
 307                         newopt="$(expr " $1" : ' -X\(.*\)')" ;;
 308                 1,*)
 309                         usage ;;
 310                 esac
 311                 strategy_opts="$strategy_opts $(git rev-parse --sq-quote "--$newopt")"
 312                 do_merge=t
 313                 ;;
 314         -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
 315                 --strateg=*|--strategy=*|\
 316         -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
 317                 case "$#,$1" in
 318                 *,*=*)
 319                         strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
 320                 1,*)
 321                         usage ;;
 322                 *)
 323                         strategy="$2"
 324                         shift ;;
 325                 esac
 326                 do_merge=t
 327                 ;;
 328         -n|--no-stat)
 329                 diffstat=
 330                 ;;
 331         --stat)
 332                 diffstat=t
 333                 ;;
 334         -v|--verbose)
 335                 verbose=t
 336                 diffstat=t
 337                 GIT_QUIET=
 338                 ;;
 339         -q|--quiet)
 340                 GIT_QUIET=t
 341                 git_am_opt="$git_am_opt -q"
 342                 verbose=
 343                 diffstat=
 344                 ;;
 345         --whitespace=*)
 346                 git_am_opt="$git_am_opt $1"
 347                 case "$1" in
 348                 --whitespace=fix|--whitespace=strip)
 349                         force_rebase=t
 350                         ;;
 351                 esac
 352                 ;;
 353         --ignore-whitespace)
 354                 git_am_opt="$git_am_opt $1"
 355                 ;;
 356         --committer-date-is-author-date|--ignore-date)
 357                 git_am_opt="$git_am_opt $1"
 358                 force_rebase=t
 359                 ;;
 360         -C*)
 361                 git_am_opt="$git_am_opt $1"
 362                 ;;
 363         --root)
 364                 rebase_root=t
 365                 ;;
 366         -f|--f|--fo|--for|--forc|--force|--force-r|--force-re|--force-reb|--force-reba|--force-rebas|--force-rebase|--no-ff)
 367                 force_rebase=t
 368                 ;;
 369         --rerere-autoupdate|--no-rerere-autoupdate)
 370                 allow_rerere_autoupdate="$1"
 371                 ;;
 372         -*)
 373                 usage
 374                 ;;
 375         *)
 376                 break
 377                 ;;
 378         esac
 379         shift
 380 done
 381 test $# -gt 2 && usage
 382
 383 if test $# -eq 0 && test -z "$rebase_root"
 384 then
 385         test -d "$merge_dir" -o -d "$apply_dir" || usage
 386         test -d "$merge_dir" -o -f "$apply_dir"/rebasing &&
 387                 die 'A rebase is in progress, try --continue, --skip or --abort.'
 388 fi
 389
 390 # Make sure we do not have $apply_dir or $merge_dir
 391 if test -z "$do_merge"
 392 then
 393         if mkdir "$apply_dir" 2>/dev/null
 394         then
 395                 rmdir "$apply_dir"
 396         else
 397                 echo >&2 '
 398 It seems that I cannot create a rebase-apply directory, and
 399 I wonder if you are in the middle of patch application or another
 400 rebase.  If that is not the case, please
 401         rm -fr '"$apply_dir"'
 402 and run me again.  I am stopping in case you still have something
 403 valuable there.'
 404                 exit 1
 405         fi
 406 else
 407         if test -d "$merge_dir"
 408         then
 409                 die "previous rebase directory $merge_dir still exists." \
 410                         'Try git rebase (--continue | --abort | --skip)'
 411         fi
 412 fi
 413
 414 require_clean_work_tree "rebase" "Please commit or stash them."
 415
 416 if test -z "$rebase_root"
 417 then
 418         # The upstream head must be given.  Make sure it is valid.
 419         upstream_name="$1"
 420         shift
 421         upstream=`git rev-parse --verify "${upstream_name}^0"` ||
 422         die "invalid upstream $upstream_name"
 423         unset root_flag
 424         upstream_arg="$upstream_name"
 425 else
 426         test -z "$newbase" && die "--root must be used with --onto"
 427         unset upstream_name
 428         unset upstream
 429         root_flag="--root"
 430         upstream_arg="$root_flag"
 431 fi
 432
 433 # Make sure the branch to rebase onto is valid.
 434 onto_name=${newbase-"$upstream_name"}
 435 case "$onto_name" in
 436 *...*)
 437         if      left=${onto_name%...*} right=${onto_name#*...} &&
 438                 onto=$(git merge-base --all ${left:-HEAD} ${right:-HEAD})
 439         then
 440                 case "$onto" in
 441                 ?*"$LF"?*)
 442                         die "$onto_name: there are more than one merge bases"
 443                         ;;
 444                 '')
 445                         die "$onto_name: there is no merge base"
 446                         ;;
 447                 esac
 448         else
 449                 die "$onto_name: there is no merge base"
 450         fi
 451         ;;
 452 *)
 453         onto=$(git rev-parse --verify "${onto_name}^0") || exit
 454         ;;
 455 esac
 456
 457 # If a hook exists, give it a chance to interrupt
 458 run_pre_rebase_hook "$upstream_arg" "$@"
 459
 460 # If the branch to rebase is given, that is the branch we will rebase
 461 # $branch_name -- branch being rebased, or HEAD (already detached)
 462 # $orig_head -- commit object name of tip of the branch before rebasing
 463 # $head_name -- refs/heads/<that-branch> or "detached HEAD"
 464 switch_to=
 465 case "$#" in
 466 1)
 467         # Is it "rebase other $branchname" or "rebase other $commit"?
 468         branch_name="$1"
 469         switch_to="$1"
 470
 471         if git show-ref --verify --quiet -- "refs/heads/$1" &&
 472            branch=$(git rev-parse -q --verify "refs/heads/$1")
 473         then
 474                 head_name="refs/heads/$1"
 475         elif branch=$(git rev-parse -q --verify "$1")
 476         then
 477                 head_name="detached HEAD"
 478         else
 479                 echo >&2 "fatal: no such branch: $1"
 480                 usage
 481         fi
 482         ;;
 483 *)
 484         # Do not need to switch branches, we are already on it.
 485         if branch_name=`git symbolic-ref -q HEAD`
 486         then
 487                 head_name=$branch_name
 488                 branch_name=`expr "z$branch_name" : 'zrefs/heads/\(.*\)'`
 489         else
 490                 head_name="detached HEAD"
 491                 branch_name=HEAD ;# detached
 492         fi
 493         branch=$(git rev-parse --verify "${branch_name}^0") || exit
 494         ;;
 495 esac
 496 orig_head=$branch
 497
 498 # Now we are rebasing commits $upstream..$branch (or with --root,
 499 # everything leading up to $branch) on top of $onto
 500
 501 # Check if we are already based on $onto with linear history,
 502 # but this should be done only when upstream and onto are the same.
 503 mb=$(git merge-base "$onto" "$branch")
 504 if test "$upstream" = "$onto" && test "$mb" = "$onto" &&
 505         # linear history?
 506         ! (git rev-list --parents "$onto".."$branch" | sane_grep " .* ") > /dev/null
 507 then
 508         if test -z "$force_rebase"
 509         then
 510                 # Lazily switch to the target branch if needed...
 511                 test -z "$switch_to" || git checkout "$switch_to" --
 512                 say "Current branch $branch_name is up to date."
 513                 exit 0
 514         else
 515                 say "Current branch $branch_name is up to date, rebase forced."
 516         fi
 517 fi
 518
 519 # Detach HEAD and reset the tree
 520 say "First, rewinding head to replay your work on top of it..."
 521 git checkout -q "$onto^0" || die "could not detach HEAD"
 522 git update-ref ORIG_HEAD $branch
 523
 524 if test -n "$diffstat"
 525 then
 526         if test -n "$verbose"
 527         then
 528                 echo "Changes from $mb to $onto:"
 529         fi
 530         # We want color (if set), but no pager
 531         GIT_PAGER='' git diff --stat --summary "$mb" "$onto"
 532 fi
 533
 534 # If the $onto is a proper descendant of the tip of the branch, then
 535 # we just fast-forwarded.
 536 if test "$mb" = "$branch"
 537 then
 538         say "Fast-forwarded $branch_name to $onto_name."
 539         move_to_original_branch
 540         exit 0
 541 fi
 542
 543 if test -n "$rebase_root"
 544 then
 545         revisions="$onto..$orig_head"
 546 else
 547         revisions="$upstream..$orig_head"
 548 fi
 549
 550 if test -z "$do_merge"
 551 then
 552         git format-patch -k --stdout --full-index --ignore-if-in-upstream \
 553                 --src-prefix=a/ --dst-prefix=b/ \
 554                 --no-renames $root_flag "$revisions" |
 555         git am $git_am_opt --rebasing --resolvemsg="$RESOLVEMSG" &&
 556         move_to_original_branch
 557         ret=$?
 558         test 0 != $ret -a -d "$apply_dir" &&
 559                 echo $head_name > "$apply_dir/head-name" &&
 560                 echo $onto > "$apply_dir/onto" &&
 561                 echo $orig_head > "$apply_dir/orig-head" &&
 562                 echo "$GIT_QUIET" > "$apply_dir/quiet"
 563         exit $ret
 564 fi
 565
 566 # start doing a rebase with git-merge
 567 # this is rename-aware if the recursive (default) strategy is used
 568
 569 mkdir -p "$merge_dir"
 570 echo "$onto_name" > "$merge_dir/onto_name"
 571 prev_head=$orig_head
 572 echo "$prev_head" > "$merge_dir/prev_head"
 573 echo "$head_name" > "$merge_dir/head-name"
 574 echo "$onto" > "$merge_dir/onto"
 575 echo "$orig_head" > "$merge_dir/orig-head"
 576 echo "$GIT_QUIET" > "$merge_dir/quiet"
 577
 578 msgnum=0
 579 for cmt in `git rev-list --reverse --no-merges "$revisions"`
 580 do
 581         msgnum=$(($msgnum + 1))
 582         echo "$cmt" > "$merge_dir/cmt.$msgnum"
 583 done
 584
 585 echo 1 >"$merge_dir/msgnum"
 586 echo $msgnum >"$merge_dir/end"
 587
 588 end=$msgnum
 589 msgnum=1
 590
 591 while test "$msgnum" -le "$end"
 592 do
 593         call_merge "$msgnum"
 594         continue_merge
 595 done
 596
 597 finish_rb_merge