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,$opt_s,$opt_l);
  35
  36 sub usage() {
  37         print STDERR <<END;
  38 Usage: ${\basename $0}     # fetch/update GIT from CVS
  39        [-o branch-for-HEAD] [-h] [-v] [-l max_num_changes]
  40        [-C GIT_repository] [-t tagname] [-T trunkname] [-b branchname]
  41        [-i] [-u] [-s start_chg] [-m] [-M regex] [SVN_URL]
  42 END
  43         exit(1);
  44 }
  45
  46 getopts("b:C:hil:mM:o:s:t:T:uv") 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 $opt_s ||= 1;
  57 $opt_l = 100 unless defined $opt_l;
  58 my $git_tree = $opt_C;
  59 $git_tree ||= ".";
  60
  61 my $cvs_tree;
  62 if ($#ARGV == 0) {
  63         $cvs_tree = $ARGV[0];
  64 } elsif (-f 'CVS/Repository') {
  65         open my $f, '<', 'CVS/Repository' or
  66             die 'Failed to open CVS/Repository';
  67         $cvs_tree = <$f>;
  68         chomp $cvs_tree;
  69         close $f;
  70 } else {
  71         usage();
  72 }
  73
  74 our @mergerx = ();
  75 if ($opt_m) {
  76         @mergerx = ( qr/\W(?:from|of|merge|merging|merged) (\w+)/i );
  77 }
  78 if ($opt_M) {
  79         push (@mergerx, qr/$opt_M/);
  80 }
  81
  82 select(STDERR); $|=1; select(STDOUT);
  83
  84
  85 package SVNconn;
  86 # Basic SVN connection.
  87 # We're only interested in connecting and downloading, so ...
  88
  89 use File::Spec;
  90 use File::Temp qw(tempfile);
  91 use POSIX qw(strftime dup2);
  92
  93 sub new {
  94         my($what,$repo) = @_;
  95         $what=ref($what) if ref($what);
  96
  97         my $self = {};
  98         $self->{'buffer'} = "";
  99         bless($self,$what);
 100
 101         $repo =~ s#/+$##;
 102         $self->{'fullrep'} = $repo;
 103         $self->conn();
 104
 105         return $self;
 106 }
 107
 108 sub conn {
 109         my $self = shift;
 110         my $repo = $self->{'fullrep'};
 111         my $s = SVN::Ra->new($repo);
 112
 113         die "SVN connection to $repo: $!\n" unless defined $s;
 114         $self->{'svn'} = $s;
 115         $self->{'repo'} = $repo;
 116         $self->{'maxrev'} = $s->get_latest_revnum();
 117 }
 118
 119 sub file {
 120         my($self,$path,$rev) = @_;
 121         my $res;
 122
 123         my ($fh, $name) = tempfile('gitsvn.XXXXXX',
 124                     DIR => File::Spec->tmpdir(), UNLINK => 1);
 125
 126         print "... $rev $path ...\n" if $opt_v;
 127         eval { $self->{'svn'}->get_file($path,$rev,$fh); };
 128         if ($@ and $@ !~ /Attempted to get checksum/) {
 129             # retry
 130             $self->conn();
 131                 eval { $self->{'svn'}->get_file($path,$rev,$fh); };
 132         };
 133         return () if $@ and $@ !~ /Attempted to get checksum/;
 134         die $@ if $@;
 135         close ($fh);
 136
 137         return ($name, $res);
 138 }
 139
 140
 141 package main;
 142
 143 my $svn = SVNconn->new($cvs_tree);
 144
 145
 146 sub pdate($) {
 147         my($d) = @_;
 148         $d =~ m#(\d\d\d\d)-(\d\d)-(\d\d)T(\d\d):(\d\d):(\d\d)#
 149                 or die "Unparseable date: $d\n";
 150         my $y=$1; $y-=1900 if $y>1900;
 151         return timegm($6||0,$5,$4,$3,$2-1,$y);
 152 }
 153
 154 sub getwd() {
 155         my $pwd = `pwd`;
 156         chomp $pwd;
 157         return $pwd;
 158 }
 159
 160
 161 sub get_headref($$) {
 162     my $name    = shift;
 163     my $git_dir = shift;
 164     my $sha;
 165
 166     if (open(C,"$git_dir/refs/heads/$name")) {
 167         chomp($sha = <C>);
 168         close(C);
 169         length($sha) == 40
 170             or die "Cannot get head id for $name ($sha): $!\n";
 171     }
 172     return $sha;
 173 }
 174
 175
 176 -d $git_tree
 177         or mkdir($git_tree,0777)
 178         or die "Could not create $git_tree: $!";
 179 chdir($git_tree);
 180
 181 my $orig_branch = "";
 182 my $forward_master = 0;
 183 my %branches;
 184
 185 my $git_dir = $ENV{"GIT_DIR"} || ".git";
 186 $git_dir = getwd()."/".$git_dir unless $git_dir =~ m#^/#;
 187 $ENV{"GIT_DIR"} = $git_dir;
 188 my $orig_git_index;
 189 $orig_git_index = $ENV{GIT_INDEX_FILE} if exists $ENV{GIT_INDEX_FILE};
 190 my ($git_ih, $git_index) = tempfile('gitXXXXXX', SUFFIX => '.idx',
 191                                     DIR => File::Spec->tmpdir());
 192 close ($git_ih);
 193 $ENV{GIT_INDEX_FILE} = $git_index;
 194 my $maxnum = 0;
 195 my $last_rev = "";
 196 my $last_branch;
 197 my $current_rev = $opt_s-1;
 198 unless(-d $git_dir) {
 199         system("git-init-db");
 200         die "Cannot init the GIT db at $git_tree: $?\n" if $?;
 201         system("git-read-tree");
 202         die "Cannot init an empty tree: $?\n" if $?;
 203
 204         $last_branch = $opt_o;
 205         $orig_branch = "";
 206 } else {
 207         -f "$git_dir/refs/heads/$opt_o"
 208                 or die "Branch '$opt_o' does not exist.\n".
 209                        "Either use the correct '-o branch' option,\n".
 210                        "or import to a new repository.\n";
 211
 212         -f "$git_dir/svn2git"
 213                 or die "'$git_dir/svn2git' does not exist.\n".
 214                        "You need that file for incremental imports.\n";
 215         $last_branch = basename(readlink("$git_dir/HEAD"));
 216         unless($last_branch) {
 217                 warn "Cannot read the last branch name: $! -- assuming 'master'\n";
 218                 $last_branch = "master";
 219         }
 220         $orig_branch = $last_branch;
 221         $last_rev = get_headref($orig_branch, $git_dir);
 222         if (-f "$git_dir/SVN2GIT_HEAD") {
 223                 die <<EOM;
 224 SVN2GIT_HEAD exists.
 225 Make sure your working directory corresponds to HEAD and remove SVN2GIT_HEAD.
 226 You may need to run
 227
 228     git-read-tree -m -u SVN2GIT_HEAD HEAD
 229 EOM
 230         }
 231         system('cp', "$git_dir/HEAD", "$git_dir/SVN2GIT_HEAD");
 232
 233         $forward_master =
 234             $opt_o ne 'master' && -f "$git_dir/refs/heads/master" &&
 235             system('cmp', '-s', "$git_dir/refs/heads/master",
 236                                 "$git_dir/refs/heads/$opt_o") == 0;
 237
 238         # populate index
 239         system('git-read-tree', $last_rev);
 240         die "read-tree failed: $?\n" if $?;
 241
 242         # Get the last import timestamps
 243         open my $B,"<", "$git_dir/svn2git";
 244         while(<$B>) {
 245                 chomp;
 246                 my($num,$branch,$ref) = split;
 247                 $branches{$branch}{$num} = $ref;
 248                 $branches{$branch}{"LAST"} = $ref;
 249                 $current_rev = $num if $current_rev < $num;
 250         }
 251         close($B);
 252 }
 253 -d $git_dir
 254         or die "Could not create git subdir ($git_dir).\n";
 255
 256 open BRANCHES,">>", "$git_dir/svn2git";
 257
 258
 259 ## cvsps output:
 260 #---------------------
 261 #PatchSet 314
 262 #Date: 1999/09/18 13:03:59
 263 #Author: wkoch
 264 #Branch: STABLE-BRANCH-1-0
 265 #Ancestor branch: HEAD
 266 #Tag: (none)
 267 #Log:
 268 #    See ChangeLog: Sat Sep 18 13:03:28 CEST 1999  Werner Koch
 269 #Members:
 270 #       README:1.57->1.57.2.1
 271 #       VERSION:1.96->1.96.2.1
 272 #
 273 #---------------------
 274
 275 my $state = 0;
 276
 277 sub get_file($$$) {
 278         my($rev,$branch,$path) = @_;
 279
 280         # revert split_path(), below
 281         my $svnpath;
 282         $path = "" if $path eq "/"; # this should not happen, but ...
 283         if($branch eq "/") {
 284                 $svnpath = "/$trunk_name/$path";
 285         } elsif($branch =~ m#^/#) {
 286                 $svnpath = "/$tag_name$branch/$path";
 287         } else {
 288                 $svnpath = "/$branch_name/$branch/$path";
 289         }
 290
 291         # now get it
 292         my ($name, $res) = eval { $svn->file($svnpath,$rev); };
 293         return () unless defined $name;
 294
 295         open my $F, '-|', "git-hash-object", "-w", $name
 296                 or die "Cannot create object: $!\n";
 297         my $sha = <$F>;
 298         chomp $sha;
 299         close $F;
 300         unlink $name;
 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 $rev;
 370         if($revision > $opt_s and 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 != $opt_s 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         my $cid;
 414         if($tag and not %$changed_paths) {
 415                 $cid = $rev;
 416         } else {
 417                 while(my($path,$action) = each %$changed_paths) {
 418                         if ($action->[0] eq "A") {
 419                                 my $f = get_file($revision,$branch,$path);
 420                                 push(@new,$f) if $f;
 421                         } elsif ($action->[0] eq "D") {
 422                                 push(@old,$path);
 423                         } elsif ($action->[0] eq "M") {
 424                                 my $f = get_file($revision,$branch,$path);
 425                                 push(@new,$f) if $f;
 426                         } elsif ($action->[0] eq "R") {
 427                                 # refer to a file/tree in an earlier commit
 428                                 push(@old,$path); # remove any old stuff
 429
 430                                 # ... and add any new stuff
 431                                 my($b,$p) = split_path($revision,$action->[1]);
 432                                 open my $F,"-|","git-ls-tree","-r","-z", $branches{$b}{$action->[2]}, $p;
 433                                 local $/ = '\0';
 434                                 while(<$F>) {
 435                                         chomp;
 436                                         my($m,$p) = split(/\t/,$_,2);
 437                                         my($mode,$type,$sha1) = split(/ /,$m);
 438                                         next if $type ne "blob";
 439                                         push(@new,[$mode,$sha1,$p]);
 440                                 }
 441                         } else {
 442                                 die "$revision: unknown action '".$action->[0]."' for $path\n";
 443                         }
 444                 }
 445
 446                 if(@old) {
 447                         open my $F, "-|", "git-ls-files", "-z", @old or die $!;
 448                         @old = ();
 449                         local $/ = '\0';
 450                         while(<$F>) {
 451                                 chomp;
 452                                 push(@old,$_);
 453                         }
 454                         close($F);
 455
 456                         while(@old) {
 457                                 my @o2;
 458                                 if(@old > 55) {
 459                                         @o2 = splice(@old,0,50);
 460                                 } else {
 461                                         @o2 = @old;
 462                                         @old = ();
 463                                 }
 464                                 system("git-update-index","--force-remove","--",@o2);
 465                                 die "Cannot remove files: $?\n" if $?;
 466                         }
 467                 }
 468                 while(@new) {
 469                         my @n2;
 470                         if(@new > 12) {
 471                                 @n2 = splice(@new,0,10);
 472                         } else {
 473                                 @n2 = @new;
 474                                 @new = ();
 475                         }
 476                         system("git-update-index","--add",
 477                                 (map { ('--cacheinfo', @$_) } @n2));
 478                         die "Cannot add files: $?\n" if $?;
 479                 }
 480
 481                 my $pid = open(C,"-|");
 482                 die "Cannot fork: $!" unless defined $pid;
 483                 unless($pid) {
 484                         exec("git-write-tree");
 485                         die "Cannot exec git-write-tree: $!\n";
 486                 }
 487                 chomp(my $tree = <C>);
 488                 length($tree) == 40
 489                         or die "Cannot get tree id ($tree): $!\n";
 490                 close(C)
 491                         or die "Error running git-write-tree: $?\n";
 492                 print "Tree ID $tree\n" if $opt_v;
 493
 494                 my $pr = IO::Pipe->new() or die "Cannot open pipe: $!\n";
 495                 my $pw = IO::Pipe->new() or die "Cannot open pipe: $!\n";
 496                 $pid = fork();
 497                 die "Fork: $!\n" unless defined $pid;
 498                 unless($pid) {
 499                         $pr->writer();
 500                         $pw->reader();
 501                         open(OUT,">&STDOUT");
 502                         dup2($pw->fileno(),0);
 503                         dup2($pr->fileno(),1);
 504                         $pr->close();
 505                         $pw->close();
 506
 507                         my @par = ();
 508                         @par = ("-p",$rev) if defined $rev;
 509
 510                         # loose detection of merges
 511                         # based on the commit msg
 512                         foreach my $rx (@mergerx) {
 513                                 if ($message =~ $rx) {
 514                                         my $mparent = $1;
 515                                         if ($mparent eq 'HEAD') { $mparent = $opt_o };
 516                                         if ( -e "$git_dir/refs/heads/$mparent") {
 517                                                 $mparent = get_headref($mparent, $git_dir);
 518                                                 push @par, '-p', $mparent;
 519                                                 print OUT "Merge parent branch: $mparent\n" if $opt_v;
 520                                         }
 521                                 }
 522                         }
 523
 524                         exec("env",
 525                                 "GIT_AUTHOR_NAME=$author_name",
 526                                 "GIT_AUTHOR_EMAIL=$author_email",
 527                                 "GIT_AUTHOR_DATE=".strftime("+0000 %Y-%m-%d %H:%M:%S",gmtime($date)),
 528                                 "GIT_COMMITTER_NAME=$author_name",
 529                                 "GIT_COMMITTER_EMAIL=$author_email",
 530                                 "GIT_COMMITTER_DATE=".strftime("+0000 %Y-%m-%d %H:%M:%S",gmtime($date)),
 531                                 "git-commit-tree", $tree,@par);
 532                         die "Cannot exec git-commit-tree: $!\n";
 533                 }
 534                 $pw->writer();
 535                 $pr->reader();
 536
 537                 $message =~ s/[\s\n]+\z//;
 538
 539                 print $pw "$message\n"
 540                         or die "Error writing to git-commit-tree: $!\n";
 541                 $pw->close();
 542
 543                 print "Committed change $revision:$branch ".strftime("%Y-%m-%d %H:%M:%S",gmtime($date)).")\n" if $opt_v;
 544                 chomp($cid = <$pr>);
 545                 length($cid) == 40
 546                         or die "Cannot get commit id ($cid): $!\n";
 547                 print "Commit ID $cid\n" if $opt_v;
 548                 $pr->close();
 549
 550                 waitpid($pid,0);
 551                 die "Error running git-commit-tree: $?\n" if $?;
 552         }
 553
 554         if(not defined $dest) {
 555                 print "... no known parent\n" if $opt_v;
 556         } elsif(not $tag) {
 557                 print "Writing to refs/heads/$dest\n" if $opt_v;
 558                 open(C,">$git_dir/refs/heads/$dest") and
 559                 print C ("$cid\n") and
 560                 close(C)
 561                         or die "Cannot write branch $dest for update: $!\n";
 562         }
 563
 564         if($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                 $dest =~ 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 $dest\n".
 575                     "tagger $author_name <$author_email>\n") and
 576                 close($out)
 577                     or die "Cannot create tag object $dest: $!\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 $dest: $!\n";
 585                 }
 586
 587                 open(C,">$git_dir/refs/tags/$dest") and
 588                 print C ("$tagobj\n") and
 589                 close(C)
 590                         or die "Cannot create tag $branch: $!\n";
 591
 592                 print "Created tag '$dest' on '$branch'\n" if $opt_v;
 593         }
 594         $branches{$branch}{"LAST"} = $cid;
 595         $branches{$branch}{$revision} = $cid;
 596         $last_rev = $cid;
 597         print BRANCHES "$revision $branch $cid\n";
 598         print "DONE: $revision $dest $cid\n" if $opt_v;
 599 }
 600
 601 my ($changed_paths, $revision, $author, $date, $message, $pool) = @_;
 602 sub _commit_all {
 603         ($changed_paths, $revision, $author, $date, $message, $pool) = @_;
 604         my %p;
 605         while(my($path,$action) = each %$changed_paths) {
 606                 $p{$path} = [ $action->action,$action->copyfrom_path, $action->copyfrom_rev ];
 607         }
 608         $changed_paths = \%p;
 609 }
 610
 611 sub commit_all {
 612         my %done;
 613         my @col;
 614         my $pref;
 615         my $branch;
 616
 617         while(my($path,$action) = each %$changed_paths) {
 618                 ($branch,$path) = split_path($revision,$path);
 619                 next if not defined $branch;
 620                 $done{$branch}{$path} = $action;
 621         }
 622         while(($branch,$changed_paths) = each %done) {
 623                 commit($branch, $changed_paths, $revision, $author, $date, $message);
 624         }
 625 }
 626
 627 while(++$current_rev <= $svn->{'maxrev'}) {
 628         $svn->{'svn'}->get_log("/",$current_rev,$current_rev,$current_rev,1,1,\&_commit_all,"");
 629         commit_all();
 630         if($opt_l and not --$opt_l) {
 631                 print STDERR "Exiting due to a memory leak. Repeat, please.\n";
 632                 last;
 633         }
 634 }
 635
 636
 637 unlink($git_index);
 638
 639 if (defined $orig_git_index) {
 640         $ENV{GIT_INDEX_FILE} = $orig_git_index;
 641 } else {
 642         delete $ENV{GIT_INDEX_FILE};
 643 }
 644
 645 # Now switch back to the branch we were in before all of this happened
 646 if($orig_branch) {
 647         print "DONE\n" if $opt_v and (not defined $opt_l or $opt_l > 0);
 648         system("cp","$git_dir/refs/heads/$opt_o","$git_dir/refs/heads/master")
 649                 if $forward_master;
 650         unless ($opt_i) {
 651                 system('git-read-tree', '-m', '-u', 'SVN2GIT_HEAD', 'HEAD');
 652                 die "read-tree failed: $?\n" if $?;
 653         }
 654 } else {
 655         $orig_branch = "master";
 656         print "DONE; creating $orig_branch branch\n" if $opt_v and (not defined $opt_l or $opt_l > 0);
 657         system("cp","$git_dir/refs/heads/$opt_o","$git_dir/refs/heads/master")
 658                 unless -f "$git_dir/refs/heads/master";
 659         unlink("$git_dir/HEAD");
 660         symlink("refs/heads/$orig_branch","$git_dir/HEAD");
 661         unless ($opt_i) {
 662                 system('git checkout');
 663                 die "checkout failed: $?\n" if $?;
 664         }
 665 }
 666 unlink("$git_dir/SVN2GIT_HEAD");
 667 close(BRANCHES);