git-am.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005, 2006 Junio C Hamano
   4
   5 SUBDIRECTORY_OK=Yes
   6 OPTIONS_KEEPDASHDASH=
   7 OPTIONS_SPEC="\
   8 git am [options] [<mbox>|<Maildir>...]
   9 git am [options] (--resolved | --skip | --abort)
  10 --
  11 i,interactive   run interactively
  12 b,binary*       (historical option -- no-op)
  13 3,3way          allow fall back on 3way merging if needed
  14 q,quiet         be quiet
  15 s,signoff       add a Signed-off-by line to the commit message
  16 u,utf8          recode into utf8 (default)
  17 k,keep          pass -k flag to git-mailinfo
  18 c,scissors      strip everything before a scissors line
  19 whitespace=     pass it through git-apply
  20 ignore-space-change pass it through git-apply
  21 ignore-whitespace pass it through git-apply
  22 directory=      pass it through git-apply
  23 C=              pass it through git-apply
  24 p=              pass it through git-apply
  25 patch-format=   format the patch(es) are in
  26 reject          pass it through git-apply
  27 resolvemsg=     override error message when patch failure occurs
  28 r,resolved      to be used after a patch failure
  29 skip            skip the current patch
  30 abort           restore the original branch and abort the patching operation.
  31 committer-date-is-author-date    lie about committer date
  32 ignore-date     use current timestamp for author date
  33 rebasing*       (internal use for git-rebase)"
  34
  35 . git-sh-setup
  36 prefix=$(git rev-parse --show-prefix)
  37 set_reflog_action am
  38 require_work_tree
  39 cd_to_toplevel
  40
  41 git var GIT_COMMITTER_IDENT >/dev/null ||
  42         die "You need to set your committer info first"
  43
  44 if git rev-parse --verify -q HEAD >/dev/null
  45 then
  46         HAS_HEAD=yes
  47 else
  48         HAS_HEAD=
  49 fi
  50
  51 sq () {
  52         git rev-parse --sq-quote "$@"
  53 }
  54
  55 stop_here () {
  56     echo "$1" >"$dotest/next"
  57     exit 1
  58 }
  59
  60 stop_here_user_resolve () {
  61     if [ -n "$resolvemsg" ]; then
  62             printf '%s\n' "$resolvemsg"
  63             stop_here $1
  64     fi
  65     cmdline="git am"
  66     if test '' != "$interactive"
  67     then
  68         cmdline="$cmdline -i"
  69     fi
  70     if test '' != "$threeway"
  71     then
  72         cmdline="$cmdline -3"
  73     fi
  74     echo "When you have resolved this problem run \"$cmdline --resolved\"."
  75     echo "If you would prefer to skip this patch, instead run \"$cmdline --skip\"."
  76     echo "To restore the original branch and stop patching run \"$cmdline --abort\"."
  77
  78     stop_here $1
  79 }
  80
  81 go_next () {
  82         rm -f "$dotest/$msgnum" "$dotest/msg" "$dotest/msg-clean" \
  83                 "$dotest/patch" "$dotest/info"
  84         echo "$next" >"$dotest/next"
  85         this=$next
  86 }
  87
  88 cannot_fallback () {
  89         echo "$1"
  90         echo "Cannot fall back to three-way merge."
  91         exit 1
  92 }
  93
  94 fall_back_3way () {
  95     O_OBJECT=`cd "$GIT_OBJECT_DIRECTORY" && pwd`
  96
  97     rm -fr "$dotest"/patch-merge-*
  98     mkdir "$dotest/patch-merge-tmp-dir"
  99
 100     # First see if the patch records the index info that we can use.
 101     git apply --build-fake-ancestor "$dotest/patch-merge-tmp-index" \
 102         "$dotest/patch" &&
 103     GIT_INDEX_FILE="$dotest/patch-merge-tmp-index" \
 104     git write-tree >"$dotest/patch-merge-base+" ||
 105     cannot_fallback "Repository lacks necessary blobs to fall back on 3-way merge."
 106
 107     say Using index info to reconstruct a base tree...
 108     if GIT_INDEX_FILE="$dotest/patch-merge-tmp-index" \
 109         git apply --cached <"$dotest/patch"
 110     then
 111         mv "$dotest/patch-merge-base+" "$dotest/patch-merge-base"
 112         mv "$dotest/patch-merge-tmp-index" "$dotest/patch-merge-index"
 113     else
 114         cannot_fallback "Did you hand edit your patch?
 115 It does not apply to blobs recorded in its index."
 116     fi
 117
 118     test -f "$dotest/patch-merge-index" &&
 119     his_tree=$(GIT_INDEX_FILE="$dotest/patch-merge-index" git write-tree) &&
 120     orig_tree=$(cat "$dotest/patch-merge-base") &&
 121     rm -fr "$dotest"/patch-merge-* || exit 1
 122
 123     say Falling back to patching base and 3-way merge...
 124
 125     # This is not so wrong.  Depending on which base we picked,
 126     # orig_tree may be wildly different from ours, but his_tree
 127     # has the same set of wildly different changes in parts the
 128     # patch did not touch, so recursive ends up canceling them,
 129     # saying that we reverted all those changes.
 130
 131     eval GITHEAD_$his_tree='"$FIRSTLINE"'
 132     export GITHEAD_$his_tree
 133     if test -n "$GIT_QUIET"
 134     then
 135             export GIT_MERGE_VERBOSITY=0
 136     fi
 137     git-merge-recursive $orig_tree -- HEAD $his_tree || {
 138             git rerere
 139             echo Failed to merge in the changes.
 140             exit 1
 141     }
 142     unset GITHEAD_$his_tree
 143 }
 144
 145 clean_abort () {
 146         test $# = 0 || echo >&2 "$@"
 147         rm -fr "$dotest"
 148         exit 1
 149 }
 150
 151 patch_format=
 152
 153 check_patch_format () {
 154         # early return if patch_format was set from the command line
 155         if test -n "$patch_format"
 156         then
 157                 return 0
 158         fi
 159
 160         # we default to mbox format if input is from stdin and for
 161         # directories
 162         if test $# = 0 || test "x$1" = "x-" || test -d "$1"
 163         then
 164                 patch_format=mbox
 165                 return 0
 166         fi
 167
 168         # otherwise, check the first few lines of the first patch to try
 169         # to detect its format
 170         {
 171                 read l1
 172                 read l2
 173                 read l3
 174                 case "$l1" in
 175                 "From "* | "From: "*)
 176                         patch_format=mbox
 177                         ;;
 178                 '# This series applies on GIT commit'*)
 179                         patch_format=stgit-series
 180                         ;;
 181                 "# HG changeset patch")
 182                         patch_format=hg
 183                         ;;
 184                 *)
 185                         # if the second line is empty and the third is
 186                         # a From, Author or Date entry, this is very
 187                         # likely an StGIT patch
 188                         case "$l2,$l3" in
 189                         ,"From: "* | ,"Author: "* | ,"Date: "*)
 190                                 patch_format=stgit
 191                                 ;;
 192                         *)
 193                                 ;;
 194                         esac
 195                         ;;
 196                 esac
 197                 if test -z "$patch_format" &&
 198                         test -n "$l1" &&
 199                         test -n "$l2" &&
 200                         test -n "$l3"
 201                 then
 202                         # This begins with three non-empty lines.  Is this a
 203                         # piece of e-mail a-la RFC2822?  Grab all the headers,
 204                         # discarding the indented remainder of folded lines,
 205                         # and see if it looks like that they all begin with the
 206                         # header field names...
 207                         sed -n -e '/^$/q' -e '/^[       ]/d' -e p "$1" |
 208                         LC_ALL=C egrep -v '^[!-9;-~]+:' >/dev/null ||
 209                         patch_format=mbox
 210                 fi
 211         } < "$1" || clean_abort
 212 }
 213
 214 split_patches () {
 215         case "$patch_format" in
 216         mbox)
 217                 case "$rebasing" in
 218                 '')
 219                         keep_cr= ;;
 220                 ?*)
 221                         keep_cr=--keep-cr ;;
 222                 esac
 223                 git mailsplit -d"$prec" -o"$dotest" -b $keep_cr -- "$@" > "$dotest/last" ||
 224                 clean_abort
 225                 ;;
 226         stgit-series)
 227                 if test $# -ne 1
 228                 then
 229                         clean_abort "Only one StGIT patch series can be applied at once"
 230                 fi
 231                 series_dir=`dirname "$1"`
 232                 series_file="$1"
 233                 shift
 234                 {
 235                         set x
 236                         while read filename
 237                         do
 238                                 set "$@" "$series_dir/$filename"
 239                         done
 240                         # remove the safety x
 241                         shift
 242                         # remove the arg coming from the first-line comment
 243                         shift
 244                 } < "$series_file" || clean_abort
 245                 # set the patch format appropriately
 246                 patch_format=stgit
 247                 # now handle the actual StGIT patches
 248                 split_patches "$@"
 249                 ;;
 250         stgit)
 251                 this=0
 252                 for stgit in "$@"
 253                 do
 254                         this=`expr "$this" + 1`
 255                         msgnum=`printf "%0${prec}d" $this`
 256                         # Perl version of StGIT parse_patch. The first nonemptyline
 257                         # not starting with Author, From or Date is the
 258                         # subject, and the body starts with the next nonempty
 259                         # line not starting with Author, From or Date
 260                         perl -ne 'BEGIN { $subject = 0 }
 261                                 if ($subject > 1) { print ; }
 262                                 elsif (/^\s+$/) { next ; }
 263                                 elsif (/^Author:/) { print s/Author/From/ ; }
 264                                 elsif (/^(From|Date)/) { print ; }
 265                                 elsif ($subject) {
 266                                         $subject = 2 ;
 267                                         print "\n" ;
 268                                         print ;
 269                                 } else {
 270                                         print "Subject: ", $_ ;
 271                                         $subject = 1;
 272                                 }
 273                         ' < "$stgit" > "$dotest/$msgnum" || clean_abort
 274                 done
 275                 echo "$this" > "$dotest/last"
 276                 this=
 277                 msgnum=
 278                 ;;
 279         *)
 280                 if test -n "$parse_patch" ; then
 281                         clean_abort "Patch format $patch_format is not supported."
 282                 else
 283                         clean_abort "Patch format detection failed."
 284                 fi
 285                 ;;
 286         esac
 287 }
 288
 289 prec=4
 290 dotest="$GIT_DIR/rebase-apply"
 291 sign= utf8=t keep= skip= interactive= resolved= rebasing= abort=
 292 resolvemsg= resume= scissors=
 293 git_apply_opt=
 294 committer_date_is_author_date=
 295 ignore_date=
 296
 297 while test $# != 0
 298 do
 299         case "$1" in
 300         -i|--interactive)
 301                 interactive=t ;;
 302         -b|--binary)
 303                 : ;;
 304         -3|--3way)
 305                 threeway=t ;;
 306         -s|--signoff)
 307                 sign=t ;;
 308         -u|--utf8)
 309                 utf8=t ;; # this is now default
 310         --no-utf8)
 311                 utf8= ;;
 312         -k|--keep)
 313                 keep=t ;;
 314         -c|--scissors)
 315                 scissors=t ;;
 316         --no-scissors)
 317                 scissors=f ;;
 318         -r|--resolved)
 319                 resolved=t ;;
 320         --skip)
 321                 skip=t ;;
 322         --abort)
 323                 abort=t ;;
 324         --rebasing)
 325                 rebasing=t threeway=t keep=t scissors=f ;;
 326         -d|--dotest)
 327                 die "-d option is no longer supported.  Do not use."
 328                 ;;
 329         --resolvemsg)
 330                 shift; resolvemsg=$1 ;;
 331         --whitespace|--directory)
 332                 git_apply_opt="$git_apply_opt $(sq "$1=$2")"; shift ;;
 333         -C|-p)
 334                 git_apply_opt="$git_apply_opt $(sq "$1$2")"; shift ;;
 335         --patch-format)
 336                 shift ; patch_format="$1" ;;
 337         --reject|--ignore-whitespace|--ignore-space-change)
 338                 git_apply_opt="$git_apply_opt $1" ;;
 339         --committer-date-is-author-date)
 340                 committer_date_is_author_date=t ;;
 341         --ignore-date)
 342                 ignore_date=t ;;
 343         -q|--quiet)
 344                 GIT_QUIET=t ;;
 345         --)
 346                 shift; break ;;
 347         *)
 348                 usage ;;
 349         esac
 350         shift
 351 done
 352
 353 # If the dotest directory exists, but we have finished applying all the
 354 # patches in them, clear it out.
 355 if test -d "$dotest" &&
 356    last=$(cat "$dotest/last") &&
 357    next=$(cat "$dotest/next") &&
 358    test $# != 0 &&
 359    test "$next" -gt "$last"
 360 then
 361    rm -fr "$dotest"
 362 fi
 363
 364 if test -d "$dotest"
 365 then
 366         case "$#,$skip$resolved$abort" in
 367         0,*t*)
 368                 # Explicit resume command and we do not have file, so
 369                 # we are happy.
 370                 : ;;
 371         0,)
 372                 # No file input but without resume parameters; catch
 373                 # user error to feed us a patch from standard input
 374                 # when there is already $dotest.  This is somewhat
 375                 # unreliable -- stdin could be /dev/null for example
 376                 # and the caller did not intend to feed us a patch but
 377                 # wanted to continue unattended.
 378                 test -t 0
 379                 ;;
 380         *)
 381                 false
 382                 ;;
 383         esac ||
 384         die "previous rebase directory $dotest still exists but mbox given."
 385         resume=yes
 386
 387         case "$skip,$abort" in
 388         t,t)
 389                 die "Please make up your mind. --skip or --abort?"
 390                 ;;
 391         t,)
 392                 git rerere clear
 393                 git read-tree --reset -u HEAD HEAD
 394                 orig_head=$(cat "$GIT_DIR/ORIG_HEAD")
 395                 git reset HEAD
 396                 git update-ref ORIG_HEAD $orig_head
 397                 ;;
 398         ,t)
 399                 if test -f "$dotest/rebasing"
 400                 then
 401                         exec git rebase --abort
 402                 fi
 403                 git rerere clear
 404                 test -f "$dotest/dirtyindex" || {
 405                         git read-tree --reset -u HEAD ORIG_HEAD
 406                         git reset ORIG_HEAD
 407                 }
 408                 rm -fr "$dotest"
 409                 exit ;;
 410         esac
 411         rm -f "$dotest/dirtyindex"
 412 else
 413         # Make sure we are not given --skip, --resolved, nor --abort
 414         test "$skip$resolved$abort" = "" ||
 415                 die "Resolve operation not in progress, we are not resuming."
 416
 417         # Start afresh.
 418         mkdir -p "$dotest" || exit
 419
 420         if test -n "$prefix" && test $# != 0
 421         then
 422                 first=t
 423                 for arg
 424                 do
 425                         test -n "$first" && {
 426                                 set x
 427                                 first=
 428                         }
 429                         case "$arg" in
 430                         /*)
 431                                 set "$@" "$arg" ;;
 432                         *)
 433                                 set "$@" "$prefix$arg" ;;
 434                         esac
 435                 done
 436                 shift
 437         fi
 438
 439         check_patch_format "$@"
 440
 441         split_patches "$@"
 442
 443         # -i can and must be given when resuming; everything
 444         # else is kept
 445         echo " $git_apply_opt" >"$dotest/apply-opt"
 446         echo "$threeway" >"$dotest/threeway"
 447         echo "$sign" >"$dotest/sign"
 448         echo "$utf8" >"$dotest/utf8"
 449         echo "$keep" >"$dotest/keep"
 450         echo "$scissors" >"$dotest/scissors"
 451         echo "$GIT_QUIET" >"$dotest/quiet"
 452         echo 1 >"$dotest/next"
 453         if test -n "$rebasing"
 454         then
 455                 : >"$dotest/rebasing"
 456         else
 457                 : >"$dotest/applying"
 458                 if test -n "$HAS_HEAD"
 459                 then
 460                         git update-ref ORIG_HEAD HEAD
 461                 else
 462                         git update-ref -d ORIG_HEAD >/dev/null 2>&1
 463                 fi
 464         fi
 465 fi
 466
 467 case "$resolved" in
 468 '')
 469         case "$HAS_HEAD" in
 470         '')
 471                 files=$(git ls-files) ;;
 472         ?*)
 473                 files=$(git diff-index --cached --name-only HEAD --) ;;
 474         esac || exit
 475         if test "$files"
 476         then
 477                 test -n "$HAS_HEAD" && : >"$dotest/dirtyindex"
 478                 die "Dirty index: cannot apply patches (dirty: $files)"
 479         fi
 480 esac
 481
 482 if test "$(cat "$dotest/utf8")" = t
 483 then
 484         utf8=-u
 485 else
 486         utf8=-n
 487 fi
 488 if test "$(cat "$dotest/keep")" = t
 489 then
 490         keep=-k
 491 fi
 492 case "$(cat "$dotest/scissors")" in
 493 t)
 494         scissors=--scissors ;;
 495 f)
 496         scissors=--no-scissors ;;
 497 esac
 498 if test "$(cat "$dotest/quiet")" = t
 499 then
 500         GIT_QUIET=t
 501 fi
 502 if test "$(cat "$dotest/threeway")" = t
 503 then
 504         threeway=t
 505 fi
 506 git_apply_opt=$(cat "$dotest/apply-opt")
 507 if test "$(cat "$dotest/sign")" = t
 508 then
 509         SIGNOFF=`git var GIT_COMMITTER_IDENT | sed -e '
 510                         s/>.*/>/
 511                         s/^/Signed-off-by: /'
 512                 `
 513 else
 514         SIGNOFF=
 515 fi
 516
 517 last=`cat "$dotest/last"`
 518 this=`cat "$dotest/next"`
 519 if test "$skip" = t
 520 then
 521         this=`expr "$this" + 1`
 522         resume=
 523 fi
 524
 525 if test "$this" -gt "$last"
 526 then
 527         say Nothing to do.
 528         rm -fr "$dotest"
 529         exit
 530 fi
 531
 532 while test "$this" -le "$last"
 533 do
 534         msgnum=`printf "%0${prec}d" $this`
 535         next=`expr "$this" + 1`
 536         test -f "$dotest/$msgnum" || {
 537                 resume=
 538                 go_next
 539                 continue
 540         }
 541
 542         # If we are not resuming, parse and extract the patch information
 543         # into separate files:
 544         #  - info records the authorship and title
 545         #  - msg is the rest of commit log message
 546         #  - patch is the patch body.
 547         #
 548         # When we are resuming, these files are either already prepared
 549         # by the user, or the user can tell us to do so by --resolved flag.
 550         case "$resume" in
 551         '')
 552                 git mailinfo $keep $scissors $utf8 "$dotest/msg" "$dotest/patch" \
 553                         <"$dotest/$msgnum" >"$dotest/info" ||
 554                         stop_here $this
 555
 556                 # skip pine's internal folder data
 557                 grep '^Author: Mail System Internal Data$' \
 558                         <"$dotest"/info >/dev/null &&
 559                         go_next && continue
 560
 561                 test -s "$dotest/patch" || {
 562                         echo "Patch is empty.  Was it split wrong?"
 563                         stop_here $this
 564                 }
 565                 if test -f "$dotest/rebasing" &&
 566                         commit=$(sed -e 's/^From \([0-9a-f]*\) .*/\1/' \
 567                                 -e q "$dotest/$msgnum") &&
 568                         test "$(git cat-file -t "$commit")" = commit
 569                 then
 570                         git cat-file commit "$commit" |
 571                         sed -e '1,/^$/d' >"$dotest/msg-clean"
 572                 else
 573                         SUBJECT="$(sed -n '/^Subject/ s/Subject: //p' "$dotest/info")"
 574                         case "$keep_subject" in -k)  SUBJECT="[PATCH] $SUBJECT" ;; esac
 575
 576                         (printf '%s\n\n' "$SUBJECT"; cat "$dotest/msg") |
 577                                 git stripspace > "$dotest/msg-clean"
 578                 fi
 579                 ;;
 580         esac
 581
 582         GIT_AUTHOR_NAME="$(sed -n '/^Author/ s/Author: //p' "$dotest/info")"
 583         GIT_AUTHOR_EMAIL="$(sed -n '/^Email/ s/Email: //p' "$dotest/info")"
 584         GIT_AUTHOR_DATE="$(sed -n '/^Date/ s/Date: //p' "$dotest/info")"
 585
 586         if test -z "$GIT_AUTHOR_EMAIL"
 587         then
 588                 echo "Patch does not have a valid e-mail address."
 589                 stop_here $this
 590         fi
 591
 592         export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_AUTHOR_DATE
 593
 594         case "$resume" in
 595         '')
 596             if test '' != "$SIGNOFF"
 597             then
 598                 LAST_SIGNED_OFF_BY=`
 599                     sed -ne '/^Signed-off-by: /p' \
 600                     "$dotest/msg-clean" |
 601                     sed -ne '$p'
 602                 `
 603                 ADD_SIGNOFF=`
 604                     test "$LAST_SIGNED_OFF_BY" = "$SIGNOFF" || {
 605                     test '' = "$LAST_SIGNED_OFF_BY" && echo
 606                     echo "$SIGNOFF"
 607                 }`
 608             else
 609                 ADD_SIGNOFF=
 610             fi
 611             {
 612                 if test -s "$dotest/msg-clean"
 613                 then
 614                         cat "$dotest/msg-clean"
 615                 fi
 616                 if test '' != "$ADD_SIGNOFF"
 617                 then
 618                         echo "$ADD_SIGNOFF"
 619                 fi
 620             } >"$dotest/final-commit"
 621             ;;
 622         *)
 623                 case "$resolved$interactive" in
 624                 tt)
 625                         # This is used only for interactive view option.
 626                         git diff-index -p --cached HEAD -- >"$dotest/patch"
 627                         ;;
 628                 esac
 629         esac
 630
 631         resume=
 632         if test "$interactive" = t
 633         then
 634             test -t 0 ||
 635             die "cannot be interactive without stdin connected to a terminal."
 636             action=again
 637             while test "$action" = again
 638             do
 639                 echo "Commit Body is:"
 640                 echo "--------------------------"
 641                 cat "$dotest/final-commit"
 642                 echo "--------------------------"
 643                 printf "Apply? [y]es/[n]o/[e]dit/[v]iew patch/[a]ccept all "
 644                 read reply
 645                 case "$reply" in
 646                 [yY]*) action=yes ;;
 647                 [aA]*) action=yes interactive= ;;
 648                 [nN]*) action=skip ;;
 649                 [eE]*) git_editor "$dotest/final-commit"
 650                        action=again ;;
 651                 [vV]*) action=again
 652                        : ${GIT_PAGER=$(git var GIT_PAGER)}
 653                        : ${LESS=-FRSX}
 654                        export LESS
 655                        $GIT_PAGER "$dotest/patch" ;;
 656                 *)     action=again ;;
 657                 esac
 658             done
 659         else
 660             action=yes
 661         fi
 662         FIRSTLINE=$(sed 1q "$dotest/final-commit")
 663
 664         if test $action = skip
 665         then
 666                 go_next
 667                 continue
 668         fi
 669
 670         if test -x "$GIT_DIR"/hooks/applypatch-msg
 671         then
 672                 "$GIT_DIR"/hooks/applypatch-msg "$dotest/final-commit" ||
 673                 stop_here $this
 674         fi
 675
 676         say "Applying: $FIRSTLINE"
 677
 678         case "$resolved" in
 679         '')
 680                 # When we are allowed to fall back to 3-way later, don't give
 681                 # false errors during the initial attempt.
 682                 squelch=
 683                 if test "$threeway" = t
 684                 then
 685                         squelch='>/dev/null 2>&1 '
 686                 fi
 687                 eval "git apply $squelch$git_apply_opt"' --index "$dotest/patch"'
 688                 apply_status=$?
 689                 ;;
 690         t)
 691                 # Resolved means the user did all the hard work, and
 692                 # we do not have to do any patch application.  Just
 693                 # trust what the user has in the index file and the
 694                 # working tree.
 695                 resolved=
 696                 git diff-index --quiet --cached HEAD -- && {
 697                         echo "No changes - did you forget to use 'git add'?"
 698                         stop_here_user_resolve $this
 699                 }
 700                 unmerged=$(git ls-files -u)
 701                 if test -n "$unmerged"
 702                 then
 703                         echo "You still have unmerged paths in your index"
 704                         echo "did you forget to use 'git add'?"
 705                         stop_here_user_resolve $this
 706                 fi
 707                 apply_status=0
 708                 git rerere
 709                 ;;
 710         esac
 711
 712         if test $apply_status = 1 && test "$threeway" = t
 713         then
 714                 if (fall_back_3way)
 715                 then
 716                     # Applying the patch to an earlier tree and merging the
 717                     # result may have produced the same tree as ours.
 718                     git diff-index --quiet --cached HEAD -- && {
 719                         say No changes -- Patch already applied.
 720                         go_next
 721                         continue
 722                     }
 723                     # clear apply_status -- we have successfully merged.
 724                     apply_status=0
 725                 fi
 726         fi
 727         if test $apply_status != 0
 728         then
 729                 printf 'Patch failed at %s %s\n' "$msgnum" "$FIRSTLINE"
 730                 stop_here_user_resolve $this
 731         fi
 732
 733         if test -x "$GIT_DIR"/hooks/pre-applypatch
 734         then
 735                 "$GIT_DIR"/hooks/pre-applypatch || stop_here $this
 736         fi
 737
 738         tree=$(git write-tree) &&
 739         commit=$(
 740                 if test -n "$ignore_date"
 741                 then
 742                         GIT_AUTHOR_DATE=
 743                 fi
 744                 parent=$(git rev-parse --verify -q HEAD) ||
 745                 say >&2 "applying to an empty history"
 746
 747                 if test -n "$committer_date_is_author_date"
 748                 then
 749                         GIT_COMMITTER_DATE="$GIT_AUTHOR_DATE"
 750                         export GIT_COMMITTER_DATE
 751                 fi &&
 752                 git commit-tree $tree ${parent:+-p} $parent <"$dotest/final-commit"
 753         ) &&
 754         git update-ref -m "$GIT_REFLOG_ACTION: $FIRSTLINE" HEAD $commit $parent ||
 755         stop_here $this
 756
 757         if test -x "$GIT_DIR"/hooks/post-applypatch
 758         then
 759                 "$GIT_DIR"/hooks/post-applypatch
 760         fi
 761
 762         go_next
 763 done
 764
 765 git gc --auto
 766
 767 rm -fr "$dotest"