git-svnimport.perl

   1 #!/usr/bin/perl -w
   2
   3 # This tool is copyright (c) 2005, Matthias Urlichs.
   4 # It is released under the Gnu Public License, version 2.
   5 #
   6 # The basic idea is to pull and analyze SVN changes.
   7 #
   8 # Checking out the files is done by a single long-running CVS connection
   9 # / server process.
  10 #
  11 # The head revision is on branch "origin" by default.
  12 # You can change that with the '-o' option.
  13
  14 require v5.8.0; # for shell-safe open("-|",LIST)
  15 use strict;
  16 use warnings;
  17 use Getopt::Std;
  18 use File::Spec;
  19 use File::Temp qw(tempfile);
  20 use File::Path qw(mkpath);
  21 use File::Basename qw(basename dirname);
  22 use Time::Local;
  23 use IO::Pipe;
  24 use POSIX qw(strftime dup2);
  25 use IPC::Open2;
  26 use SVN::Core;
  27 use SVN::Ra;
  28
  29 die "Need CVN:COre 1.2.1 or better" if $SVN::Core::VERSION lt "1.2.1";
  30
  31 $SIG{'PIPE'}="IGNORE";
  32 $ENV{'TZ'}="UTC";
  33
  34 our($opt_h,$opt_o,$opt_v,$opt_u,$opt_C,$opt_i,$opt_m,$opt_M,$opt_t,$opt_T,$opt_b);
  35
  36 sub usage() {
  37         print STDERR <<END;
  38 Usage: ${\basename $0}     # fetch/update GIT from CVS
  39        [-o branch-for-HEAD] [-h] [-v]
  40        [-C GIT_repository] [-t tagname] [-T trunkname] [-b branchname]
  41        [-i] [-u] [-s subst] [-m] [-M regex] [SVN_URL]
  42 END
  43         exit(1);
  44 }
  45
  46 getopts("b:C:hivmM:o:t:T:u") or usage();
  47 usage if $opt_h;
  48
  49 my $tag_name = $opt_t || "tags";
  50 my $trunk_name = $opt_T || "trunk";
  51 my $branch_name = $opt_b || "branches";
  52
  53 @ARGV <= 1 or usage();
  54
  55 $opt_o ||= "origin";
  56 my $git_tree = $opt_C;
  57 $git_tree ||= ".";
  58
  59 my $cvs_tree;
  60 if ($#ARGV == 0) {
  61         $cvs_tree = $ARGV[0];
  62 } elsif (-f 'CVS/Repository') {
  63         open my $f, '<', 'CVS/Repository' or
  64             die 'Failed to open CVS/Repository';
  65         $cvs_tree = <$f>;
  66         chomp $cvs_tree;
  67         close $f;
  68 } else {
  69         usage();
  70 }
  71
  72 our @mergerx = ();
  73 if ($opt_m) {
  74         @mergerx = ( qr/\W(?:from|of|merge|merging|merged) (\w+)/i );
  75 }
  76 if ($opt_M) {
  77         push (@mergerx, qr/$opt_M/);
  78 }
  79
  80 select(STDERR); $|=1; select(STDOUT);
  81
  82
  83 package SVNconn;
  84 # Basic SVN connection.
  85 # We're only interested in connecting and downloading, so ...
  86
  87 use File::Spec;
  88 use File::Temp qw(tempfile);
  89 use POSIX qw(strftime dup2);
  90
  91 sub new {
  92         my($what,$repo) = @_;
  93         $what=ref($what) if ref($what);
  94
  95         my $self = {};
  96         $self->{'buffer'} = "";
  97         bless($self,$what);
  98
  99         $repo =~ s#/+$##;
 100         $self->{'fullrep'} = $repo;
 101         $self->conn();
 102
 103         return $self;
 104 }
 105
 106 sub conn {
 107         my $self = shift;
 108         my $repo = $self->{'fullrep'};
 109         my $s = SVN::Ra->new($repo);
 110
 111         die "SVN connection to $repo: $!\n" unless defined $s;
 112         $self->{'svn'} = $s;
 113         print STDERR "*** SVN *** $s ***\n";
 114         $self->{'repo'} = $repo;
 115         $self->{'maxrev'} = $s->get_latest_revnum();
 116 }
 117
 118 sub file {
 119         my($self,$path,$rev) = @_;
 120         my $res;
 121
 122         my ($fh, $name) = tempfile('gitsvn.XXXXXX',
 123                     DIR => File::Spec->tmpdir(), UNLINK => 1);
 124
 125         print "... $rev $path ...\n" if $opt_v;
 126         my $s = $self->{'svn'};
 127         print STDERR "*** GET *** $s ***\n";
 128         eval { $s->get_file($path,$rev,$fh); };
 129         if ($@ and $@ !~ /Attempted to get checksum/) {
 130             # retry
 131             $self->conn();
 132                 eval { $self->{'svn'}->get_file($path,$rev,$fh); };
 133         };
 134         return () if $@ and $@ !~ /Attempted to get checksum/;
 135         die $@ if $@;
 136         close ($fh);
 137
 138         return ($name, $res);
 139 }
 140
 141
 142 package main;
 143
 144 my $svn = SVNconn->new($cvs_tree);
 145
 146
 147 sub pdate($) {
 148         my($d) = @_;
 149         $d =~ m#(\d\d\d\d)-(\d\d)-(\d\d)T(\d\d):(\d\d):(\d\d)#
 150                 or die "Unparseable date: $d\n";
 151         my $y=$1; $y-=1900 if $y>1900;
 152         return timegm($6||0,$5,$4,$3,$2-1,$y);
 153 }
 154
 155 sub getwd() {
 156         my $pwd = `pwd`;
 157         chomp $pwd;
 158         return $pwd;
 159 }
 160
 161
 162 sub get_headref($$) {
 163     my $name    = shift;
 164     my $git_dir = shift;
 165     my $sha;
 166
 167     if (open(C,"$git_dir/refs/heads/$name")) {
 168         chomp($sha = <C>);
 169         close(C);
 170         length($sha) == 40
 171             or die "Cannot get head id for $name ($sha): $!\n";
 172     }
 173     return $sha;
 174 }
 175
 176
 177 -d $git_tree
 178         or mkdir($git_tree,0777)
 179         or die "Could not create $git_tree: $!";
 180 chdir($git_tree);
 181
 182 my $orig_branch = "";
 183 my $forward_master = 0;
 184 my %branches;
 185
 186 my $git_dir = $ENV{"GIT_DIR"} || ".git";
 187 $git_dir = getwd()."/".$git_dir unless $git_dir =~ m#^/#;
 188 $ENV{"GIT_DIR"} = $git_dir;
 189 my $orig_git_index;
 190 $orig_git_index = $ENV{GIT_INDEX_FILE} if exists $ENV{GIT_INDEX_FILE};
 191 my ($git_ih, $git_index) = tempfile('gitXXXXXX', SUFFIX => '.idx',
 192                                     DIR => File::Spec->tmpdir());
 193 close ($git_ih);
 194 $ENV{GIT_INDEX_FILE} = $git_index;
 195 my $maxnum = 0;
 196 my $last_rev = "";
 197 my $last_branch;
 198 my $current_rev = 0;
 199 unless(-d $git_dir) {
 200         system("git-init-db");
 201         die "Cannot init the GIT db at $git_tree: $?\n" if $?;
 202         system("git-read-tree");
 203         die "Cannot init an empty tree: $?\n" if $?;
 204
 205         $last_branch = $opt_o;
 206         $orig_branch = "";
 207 } else {
 208         -f "$git_dir/refs/heads/$opt_o"
 209                 or die "Branch '$opt_o' does not exist.\n".
 210                        "Either use the correct '-o branch' option,\n".
 211                        "or import to a new repository.\n";
 212
 213         -f "$git_dir/svn2git"
 214                 or die "'$git_dir/svn2git' does not exist.\n".
 215                        "You need that file for incremental imports.\n";
 216         $last_branch = basename(readlink("$git_dir/HEAD"));
 217         unless($last_branch) {
 218                 warn "Cannot read the last branch name: $! -- assuming 'master'\n";
 219                 $last_branch = "master";
 220         }
 221         $orig_branch = $last_branch;
 222         $last_rev = get_headref($orig_branch, $git_dir);
 223         if (-f "$git_dir/SVN2GIT_HEAD") {
 224                 die <<EOM;
 225 SVN2GIT_HEAD exists.
 226 Make sure your working directory corresponds to HEAD and remove SVN2GIT_HEAD.
 227 You may need to run
 228
 229     git-read-tree -m -u SVN2GIT_HEAD HEAD
 230 EOM
 231         }
 232         system('cp', "$git_dir/HEAD", "$git_dir/SVN2GIT_HEAD");
 233
 234         $forward_master =
 235             $opt_o ne 'master' && -f "$git_dir/refs/heads/master" &&
 236             system('cmp', '-s', "$git_dir/refs/heads/master",
 237                                 "$git_dir/refs/heads/$opt_o") == 0;
 238
 239         # populate index
 240         system('git-read-tree', $last_rev);
 241         die "read-tree failed: $?\n" if $?;
 242
 243         # Get the last import timestamps
 244         open my $B,"<", "$git_dir/svn2git";
 245         while(<$B>) {
 246                 chomp;
 247                 my($num,$branch,$ref) = split;
 248                 $branches{$branch}{$num} = $ref;
 249                 $branches{$branch}{"LAST"} = $ref;
 250                 $current_rev = $num+1 if $current_rev < $num+1;
 251         }
 252         close($B);
 253 }
 254 -d $git_dir
 255         or die "Could not create git subdir ($git_dir).\n";
 256
 257 open BRANCHES,">>", "$git_dir/svn2git";
 258
 259
 260 ## cvsps output:
 261 #---------------------
 262 #PatchSet 314
 263 #Date: 1999/09/18 13:03:59
 264 #Author: wkoch
 265 #Branch: STABLE-BRANCH-1-0
 266 #Ancestor branch: HEAD
 267 #Tag: (none)
 268 #Log:
 269 #    See ChangeLog: Sat Sep 18 13:03:28 CEST 1999  Werner Koch
 270 #Members:
 271 #       README:1.57->1.57.2.1
 272 #       VERSION:1.96->1.96.2.1
 273 #
 274 #---------------------
 275
 276 my $state = 0;
 277
 278 sub get_file($$$) {
 279         my($rev,$branch,$path) = @_;
 280
 281         # revert split_path(), below
 282         my $svnpath;
 283         $path = "" if $path eq "/"; # this should not happen, but ...
 284         if($branch eq "/") {
 285                 $svnpath = "/$trunk_name/$path";
 286         } elsif($branch =~ m#^/#) {
 287                 $svnpath = "/$tag_name$branch/$path";
 288         } else {
 289                 $svnpath = "/$branch_name/$branch/$path";
 290         }
 291
 292         # now get it
 293         my ($name, $res) = eval { $svn->file($svnpath,$rev); };
 294         return () unless defined $name;
 295
 296         open my $F, '-|', "git-hash-object", "-w", $name
 297                 or die "Cannot create object: $!\n";
 298         my $sha = <$F>;
 299         chomp $sha;
 300         close $F;
 301         my $mode = "0644"; # SV does not seem to store any file modes
 302         return [$mode, $sha, $path];
 303 }
 304
 305 sub split_path($$) {
 306         my($rev,$path) = @_;
 307         my $branch;
 308
 309         if($path =~ s#^/\Q$tag_name\E/([^/]+)/?##) {
 310                 $branch = "/$1";
 311         } elsif($path =~ s#^/\Q$trunk_name\E/?##) {
 312                 $branch = "/";
 313         } elsif($path =~ s#^/\Q$branch_name\E/([^/]+)/?##) {
 314                 $branch = $1;
 315         } else {
 316                 print STDERR "$rev: Unrecognized path: $path\n";
 317                 return ()
 318         }
 319         $path = "/" if $path eq "";
 320         return ($branch,$path);
 321 }
 322
 323 sub commit {
 324         my($branch, $changed_paths, $revision, $author, $date, $message) = @_;
 325         my($author_name,$author_email,$dest);
 326         my(@old,@new);
 327
 328         if (not defined $author) {
 329                 $author_name = $author_email = "unknown";
 330         } elsif ($author =~ /^(.*?)\s+<(.*)>$/) {
 331                 ($author_name, $author_email) = ($1, $2);
 332         } else {
 333                 $author =~ s/^<(.*)>$/$1/;
 334                 $author_name = $author_email = $author;
 335         }
 336         $date = pdate($date);
 337
 338         my $tag;
 339         my $parent;
 340         if($branch eq "/") { # trunk
 341                 $parent = $opt_o;
 342         } elsif($branch =~ m#^/(.+)#) { # tag
 343                 $tag = 1;
 344                 $parent = $1;
 345         } else { # "normal" branch
 346                 # nothing to do
 347                 $parent = $branch;
 348         }
 349         $dest = $parent;
 350
 351         my $prev = $changed_paths->{"/"};
 352         if($prev and $prev->[0] eq "A") {
 353                 delete $changed_paths->{"/"};
 354                 my $oldpath = $prev->[1];
 355                 my $rev;
 356                 if(defined $oldpath) {
 357                         my $p;
 358                         ($parent,$p) = split_path($revision,$oldpath);
 359                         if($parent eq "/") {
 360                                 $parent = $opt_o;
 361                         } else {
 362                                 $parent =~ s#^/##; # if it's a tag
 363                         }
 364                 } else {
 365                         $parent = undef;
 366                 }
 367         }
 368
 369         my $rev;
 370         if(defined $parent) {
 371                 open(H,"git-rev-parse --verify $parent |");
 372                 $rev = <H>;
 373                 close(H) or do {
 374                         print STDERR "$revision: cannot find commit '$parent'!\n";
 375                         return;
 376                 };
 377                 chop $rev;
 378                 if(length($rev) != 40) {
 379                         print STDERR "$revision: cannot find commit '$parent'!\n";
 380                         return;
 381                 }
 382                 $rev = $branches{($parent eq $opt_o) ? "/" : $parent}{"LAST"};
 383                 if($revision != 1 and not $rev) {
 384                         print STDERR "$revision: do not know ancestor for '$parent'!\n";
 385                         return;
 386                 }
 387         } else {
 388                 $rev = undef;
 389         }
 390
 391 #       if($prev and $prev->[0] eq "A") {
 392 #               if(not $tag) {
 393 #                       unless(open(H,"> $git_dir/refs/heads/$branch")) {
 394 #                               print STDERR "$revision: Could not create branch $branch: $!\n";
 395 #                               $state=11;
 396 #                               next;
 397 #                       }
 398 #                       print H "$rev\n"
 399 #                               or die "Could not write branch $branch: $!";
 400 #                       close(H)
 401 #                               or die "Could not write branch $branch: $!";
 402 #               }
 403 #       }
 404         if(not defined $rev) {
 405                 unlink($git_index);
 406         } elsif ($rev ne $last_rev) {
 407                 print "Switching from $last_rev to $rev ($branch)\n" if $opt_v;
 408                 system("git-read-tree", $rev);
 409                 die "read-tree failed for $rev: $?\n" if $?;
 410                 $last_rev = $rev;
 411         }
 412
 413         while(my($path,$action) = each %$changed_paths) {
 414                 if ($action->[0] eq "A") {
 415                         my $f = get_file($revision,$branch,$path);
 416                         push(@new,$f) if $f;
 417                 } elsif ($action->[0] eq "D") {
 418                         push(@old,$path);
 419                 } elsif ($action->[0] eq "M") {
 420                         my $f = get_file($revision,$branch,$path);
 421                         push(@new,$f) if $f;
 422                 } elsif ($action->[0] eq "R") {
 423                         # refer to a file/tree in an earlier commit
 424                         push(@old,$path); # remove any old stuff
 425
 426                         # ... and add any new stuff
 427                         my($b,$p) = split_path($revision,$action->[1]);
 428                         open my $F,"-|","git-ls-tree","-r","-z", $branches{$b}{$action->[2]}, $p;
 429                         local $/ = '\0';
 430                         while(<$F>) {
 431                                 chomp;
 432                                 my($m,$p) = split(/\t/,$_,2);
 433                                 my($mode,$type,$sha1) = split(/ /,$m);
 434                                 next if $type ne "blob";
 435                                 push(@new,[$mode,$sha1,$p]);
 436                         }
 437                 } else {
 438                         die "$revision: unknown action '".$action->[0]."' for $path\n";
 439                 }
 440         }
 441
 442         if(@old) {
 443                 open my $F, "-|", "git-ls-files", "-z", @old or die $!;
 444                 @old = ();
 445                 local $/ = '\0';
 446                 while(<$F>) {
 447                         chomp;
 448                         push(@old,$_);
 449                 }
 450                 close($F);
 451
 452                 while(@old) {
 453                         my @o2;
 454                         if(@old > 55) {
 455                                 @o2 = splice(@old,0,50);
 456                         } else {
 457                                 @o2 = @old;
 458                                 @old = ();
 459                         }
 460                         system("git-update-index","--force-remove","--",@o2);
 461                         die "Cannot remove files: $?\n" if $?;
 462                 }
 463         }
 464         while(@new) {
 465                 my @n2;
 466                 if(@new > 12) {
 467                         @n2 = splice(@new,0,10);
 468                 } else {
 469                         @n2 = @new;
 470                         @new = ();
 471                 }
 472                 system("git-update-index","--add",
 473                         (map { ('--cacheinfo', @$_) } @n2));
 474                 die "Cannot add files: $?\n" if $?;
 475         }
 476
 477         my $pid = open(C,"-|");
 478         die "Cannot fork: $!" unless defined $pid;
 479         unless($pid) {
 480                 exec("git-write-tree");
 481                 die "Cannot exec git-write-tree: $!\n";
 482         }
 483         chomp(my $tree = <C>);
 484         length($tree) == 40
 485                 or die "Cannot get tree id ($tree): $!\n";
 486         close(C)
 487                 or die "Error running git-write-tree: $?\n";
 488         print "Tree ID $tree\n" if $opt_v;
 489
 490         my $pr = IO::Pipe->new() or die "Cannot open pipe: $!\n";
 491         my $pw = IO::Pipe->new() or die "Cannot open pipe: $!\n";
 492         $pid = fork();
 493         die "Fork: $!\n" unless defined $pid;
 494         unless($pid) {
 495                 $pr->writer();
 496                 $pw->reader();
 497                 open(OUT,">&STDOUT");
 498                 dup2($pw->fileno(),0);
 499                 dup2($pr->fileno(),1);
 500                 $pr->close();
 501                 $pw->close();
 502
 503                 my @par = ();
 504                 @par = ("-p",$rev) if defined $rev;
 505
 506                 # loose detection of merges
 507                 # based on the commit msg
 508                 foreach my $rx (@mergerx) {
 509                         if ($message =~ $rx) {
 510                                 my $mparent = $1;
 511                                 if ($mparent eq 'HEAD') { $mparent = $opt_o };
 512                                 if ( -e "$git_dir/refs/heads/$mparent") {
 513                                         $mparent = get_headref($mparent, $git_dir);
 514                                         push @par, '-p', $mparent;
 515                                         print OUT "Merge parent branch: $mparent\n" if $opt_v;
 516                                 }
 517                         }
 518                 }
 519
 520                 exec("env",
 521                         "GIT_AUTHOR_NAME=$author_name",
 522                         "GIT_AUTHOR_EMAIL=$author_email",
 523                         "GIT_AUTHOR_DATE=".strftime("+0000 %Y-%m-%d %H:%M:%S",gmtime($date)),
 524                         "GIT_COMMITTER_NAME=$author_name",
 525                         "GIT_COMMITTER_EMAIL=$author_email",
 526                         "GIT_COMMITTER_DATE=".strftime("+0000 %Y-%m-%d %H:%M:%S",gmtime($date)),
 527                         "git-commit-tree", $tree,@par);
 528                 die "Cannot exec git-commit-tree: $!\n";
 529         }
 530         $pw->writer();
 531         $pr->reader();
 532
 533         $message =~ s/[\s\n]+\z//;
 534
 535         print $pw "$message\n"
 536                 or die "Error writing to git-commit-tree: $!\n";
 537         $pw->close();
 538
 539         print "Committed change $revision:$branch ".strftime("%Y-%m-%d %H:%M:%S",gmtime($date)).")\n" if $opt_v;
 540         chomp(my $cid = <$pr>);
 541         length($cid) == 40
 542                 or die "Cannot get commit id ($cid): $!\n";
 543         print "Commit ID $cid\n" if $opt_v;
 544         $pr->close();
 545
 546         waitpid($pid,0);
 547         die "Error running git-commit-tree: $?\n" if $?;
 548
 549         if(defined $dest) {
 550                 print "Writing to refs/heads/$dest\n" if $opt_v;
 551                 open(C,">$git_dir/refs/heads/$dest") and
 552                 print C ("$cid\n") and
 553                 close(C)
 554                         or die "Cannot write branch $dest for update: $!\n";
 555         } else {
 556                 print "... no known parent\n" if $opt_v;
 557         }
 558         $branches{$branch}{"LAST"} = $cid;
 559         $branches{$branch}{$revision} = $cid;
 560         $last_rev = $cid;
 561         print BRANCHES "$revision $branch $cid\n";
 562         print "DONE: $revision $dest $cid\n" if $opt_v;
 563
 564         if($tag) {
 565                 my($in, $out) = ('','');
 566                 $last_rev = "-" if %$changed_paths;
 567                 # the tag was 'complex', i.e. did not refer to a "real" revision
 568
 569                 $tag =~ tr/_/\./ if $opt_u;
 570
 571                 my $pid = open2($in, $out, 'git-mktag');
 572                 print $out ("object $cid\n".
 573                     "type commit\n".
 574                     "tag $tag\n".
 575                     "tagger $author_name <$author_email>\n") and
 576                 close($out)
 577                     or die "Cannot create tag object $tag: $!\n";
 578
 579                 my $tagobj = <$in>;
 580                 chomp $tagobj;
 581
 582                 if ( !close($in) or waitpid($pid, 0) != $pid or
 583                                 $? != 0 or $tagobj !~ /^[0123456789abcdef]{40}$/ ) {
 584                         die "Cannot create tag object $tag: $!\n";
 585                 }
 586
 587
 588                 open(C,">$git_dir/refs/tags/$tag")
 589                         or die "Cannot create tag $tag: $!\n";
 590                 print C "$tagobj\n"
 591                         or die "Cannot write tag $tag: $!\n";
 592                 close(C)
 593                         or die "Cannot write tag $tag: $!\n";
 594
 595                 print "Created tag '$tag' on '$branch'\n" if $opt_v;
 596         }
 597 }
 598
 599 my ($changed_paths, $revision, $author, $date, $message, $pool) = @_;
 600 sub _commit_all {
 601         ($changed_paths, $revision, $author, $date, $message, $pool) = @_;
 602         my %p;
 603         while(my($path,$action) = each %$changed_paths) {
 604                 $p{$path} = [ $action->action,$action->copyfrom_path, $action->copyfrom_rev ];
 605         }
 606         $changed_paths = \%p;
 607 }
 608
 609 sub commit_all {
 610         my %done;
 611         my @col;
 612         my $pref;
 613         my $branch;
 614
 615         while(my($path,$action) = each %$changed_paths) {
 616                 ($branch,$path) = split_path($revision,$path);
 617                 next if not defined $branch;
 618                 $done{$branch}{$path} = $action;
 619         }
 620         while(($branch,$changed_paths) = each %done) {
 621                 commit($branch, $changed_paths, $revision, $author, $date, $message);
 622         }
 623 }
 624
 625 while(++$current_rev < $svn->{'maxrev'}) {
 626         $svn->{'svn'}->get_log("/",$current_rev,$current_rev,$current_rev,1,1,\&_commit_all,"");
 627         commit_all();
 628 }
 629
 630
 631 unlink($git_index);
 632
 633 if (defined $orig_git_index) {
 634         $ENV{GIT_INDEX_FILE} = $orig_git_index;
 635 } else {
 636         delete $ENV{GIT_INDEX_FILE};
 637 }
 638
 639 # Now switch back to the branch we were in before all of this happened
 640 if($orig_branch) {
 641         print "DONE\n" if $opt_v;
 642         system("cp","$git_dir/refs/heads/$opt_o","$git_dir/refs/heads/master")
 643                 if $forward_master;
 644         unless ($opt_i) {
 645                 system('git-read-tree', '-m', '-u', 'SVN2GIT_HEAD', 'HEAD');
 646                 die "read-tree failed: $?\n" if $?;
 647         }
 648 } else {
 649         $orig_branch = "master";
 650         print "DONE; creating $orig_branch branch\n" if $opt_v;
 651         system("cp","$git_dir/refs/heads/$opt_o","$git_dir/refs/heads/master")
 652                 unless -f "$git_dir/refs/heads/master";
 653         unlink("$git_dir/HEAD");
 654         symlink("refs/heads/$orig_branch","$git_dir/HEAD");
 655         unless ($opt_i) {
 656                 system('git checkout');
 657                 die "checkout failed: $?\n" if $?;
 658         }
 659 }
 660 unlink("$git_dir/SVN2GIT_HEAD");
 661 close(BRANCHES);