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 SVN connection.
9#
10# The head revision is on branch "origin" by default.
11# You can change that with the '-o' option.
12
13require v5.8.0; # for shell-safe open("-|",LIST)
14use strict;
15use warnings;
16use Getopt::Std;
17use File::Spec;
18use File::Temp qw(tempfile);
19use File::Path qw(mkpath);
20use File::Basename qw(basename dirname);
21use Time::Local;
22use IO::Pipe;
23use POSIX qw(strftime dup2);
24use IPC::Open2;
25use SVN::Core;
26use SVN::Ra;
27
28die "Need CVN:Core 1.2.1 or better" if $SVN::Core::VERSION lt "1.2.1";
29
30$SIG{'PIPE'}="IGNORE";
31$ENV{'TZ'}="UTC";
32
33our($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,$opt_d,$opt_D);
34
35sub usage() {
36 print STDERR <<END;
37Usage: ${\basename $0} # fetch/update GIT from CVS
38 [-o branch-for-HEAD] [-h] [-v] [-l max_num_changes]
39 [-C GIT_repository] [-t tagname] [-T trunkname] [-b branchname]
40 [-d|-D] [-i] [-u] [-s start_chg] [-m] [-M regex] [SVN_URL]
41END
42 exit(1);
43}
44
45getopts("b:C:dDhil:mM:o:s:t:T:uv") or usage();
46usage if $opt_h;
47
48my $tag_name = $opt_t || "tags";
49my $trunk_name = $opt_T || "trunk";
50my $branch_name = $opt_b || "branches";
51
52@ARGV == 1 or @ARGV == 2 or usage();
53
54$opt_o ||= "origin";
55$opt_s ||= 1;
56$opt_l = 100 unless defined $opt_l;
57my $git_tree = $opt_C;
58$git_tree ||= ".";
59
60my $svn_url = $ARGV[0];
61my $svn_dir = $ARGV[1];
62
63our @mergerx = ();
64if ($opt_m) {
65 @mergerx = ( qr/\W(?:from|of|merge|merging|merged) (\w+)/i );
66}
67if ($opt_M) {
68 push (@mergerx, qr/$opt_M/);
69}
70
71select(STDERR); $|=1; select(STDOUT);
72
73
74package SVNconn;
75# Basic SVN connection.
76# We're only interested in connecting and downloading, so ...
77
78use File::Spec;
79use File::Temp qw(tempfile);
80use POSIX qw(strftime dup2);
81
82sub new {
83 my($what,$repo) = @_;
84 $what=ref($what) if ref($what);
85
86 my $self = {};
87 $self->{'buffer'} = "";
88 bless($self,$what);
89
90 $repo =~ s#/+$##;
91 $self->{'fullrep'} = $repo;
92 $self->conn();
93
94 return $self;
95}
96
97sub conn {
98 my $self = shift;
99 my $repo = $self->{'fullrep'};
100 my $s = SVN::Ra->new($repo);
101
102 die "SVN connection to $repo: $!\n" unless defined $s;
103 $self->{'svn'} = $s;
104 $self->{'repo'} = $repo;
105 $self->{'maxrev'} = $s->get_latest_revnum();
106}
107
108sub file {
109 my($self,$path,$rev) = @_;
110
111 my ($fh, $name) = tempfile('gitsvn.XXXXXX',
112 DIR => File::Spec->tmpdir(), UNLINK => 1);
113
114 print "... $rev $path ...\n" if $opt_v;
115 eval { $self->{'svn'}->get_file($path,$rev,$fh); };
116 if($@) {
117 return undef if $@ =~ /Attempted to get checksum/;
118 die $@;
119 }
120 close ($fh);
121
122 return $name;
123}
124
125package main;
126use URI;
127
128my $svn = $svn_url;
129$svn .= "/$svn_dir" if defined $svn_dir;
130$svn = SVNconn->new($svn);
131
132my $lwp_ua;
133if($opt_d or $opt_D) {
134 $svn_url = URI->new($svn_url)->canonical;
135 if($opt_D) {
136 $svn_dir =~ s#/*$#/#;
137 } else {
138 $svn_dir = "";
139 }
140 if ($svn_url->scheme eq "http") {
141 use LWP::UserAgent;
142 $lwp_ua = LWP::UserAgent->new(keep_alive => 1, requests_redirectable => []);
143 } else {
144 print STDERR "Warning: not HTTP; turning off direct file access\n";
145 $opt_d=0;
146 }
147}
148
149sub pdate($) {
150 my($d) = @_;
151 $d =~ m#(\d\d\d\d)-(\d\d)-(\d\d)T(\d\d):(\d\d):(\d\d)#
152 or die "Unparseable date: $d\n";
153 my $y=$1; $y-=1900 if $y>1900;
154 return timegm($6||0,$5,$4,$3,$2-1,$y);
155}
156
157sub getwd() {
158 my $pwd = `pwd`;
159 chomp $pwd;
160 return $pwd;
161}
162
163
164sub get_headref($$) {
165 my $name = shift;
166 my $git_dir = shift;
167 my $sha;
168
169 if (open(C,"$git_dir/refs/heads/$name")) {
170 chomp($sha = <C>);
171 close(C);
172 length($sha) == 40
173 or die "Cannot get head id for $name ($sha): $!\n";
174 }
175 return $sha;
176}
177
178
179-d $git_tree
180 or mkdir($git_tree,0777)
181 or die "Could not create $git_tree: $!";
182chdir($git_tree);
183
184my $orig_branch = "";
185my $forward_master = 0;
186my %branches;
187
188my $git_dir = $ENV{"GIT_DIR"} || ".git";
189$git_dir = getwd()."/".$git_dir unless $git_dir =~ m#^/#;
190$ENV{"GIT_DIR"} = $git_dir;
191my $orig_git_index;
192$orig_git_index = $ENV{GIT_INDEX_FILE} if exists $ENV{GIT_INDEX_FILE};
193my ($git_ih, $git_index) = tempfile('gitXXXXXX', SUFFIX => '.idx',
194 DIR => File::Spec->tmpdir());
195close ($git_ih);
196$ENV{GIT_INDEX_FILE} = $git_index;
197my $maxnum = 0;
198my $last_rev = "";
199my $last_branch;
200my $current_rev = $opt_s-1;
201unless(-d $git_dir) {
202 system("git-init-db");
203 die "Cannot init the GIT db at $git_tree: $?\n" if $?;
204 system("git-read-tree");
205 die "Cannot init an empty tree: $?\n" if $?;
206
207 $last_branch = $opt_o;
208 $orig_branch = "";
209} else {
210 -f "$git_dir/refs/heads/$opt_o"
211 or die "Branch '$opt_o' does not exist.\n".
212 "Either use the correct '-o branch' option,\n".
213 "or import to a new repository.\n";
214
215 -f "$git_dir/svn2git"
216 or die "'$git_dir/svn2git' does not exist.\n".
217 "You need that file for incremental imports.\n";
218 $last_branch = basename(readlink("$git_dir/HEAD"));
219 unless($last_branch) {
220 warn "Cannot read the last branch name: $! -- assuming 'master'\n";
221 $last_branch = "master";
222 }
223 $orig_branch = $last_branch;
224 $last_rev = get_headref($orig_branch, $git_dir);
225 if (-f "$git_dir/SVN2GIT_HEAD") {
226 die <<EOM;
227SVN2GIT_HEAD exists.
228Make sure your working directory corresponds to HEAD and remove SVN2GIT_HEAD.
229You may need to run
230
231 git-read-tree -m -u SVN2GIT_HEAD HEAD
232EOM
233 }
234 system('cp', "$git_dir/HEAD", "$git_dir/SVN2GIT_HEAD");
235
236 $forward_master =
237 $opt_o ne 'master' && -f "$git_dir/refs/heads/master" &&
238 system('cmp', '-s', "$git_dir/refs/heads/master",
239 "$git_dir/refs/heads/$opt_o") == 0;
240
241 # populate index
242 system('git-read-tree', $last_rev);
243 die "read-tree failed: $?\n" if $?;
244
245 # Get the last import timestamps
246 open my $B,"<", "$git_dir/svn2git";
247 while(<$B>) {
248 chomp;
249 my($num,$branch,$ref) = split;
250 $branches{$branch}{$num} = $ref;
251 $branches{$branch}{"LAST"} = $ref;
252 $current_rev = $num if $current_rev < $num;
253 }
254 close($B);
255}
256-d $git_dir
257 or die "Could not create git subdir ($git_dir).\n";
258
259open BRANCHES,">>", "$git_dir/svn2git";
260
261sub get_file($$$) {
262 my($rev,$branch,$path) = @_;
263
264 # revert split_path(), below
265 my $svnpath;
266 $path = "" if $path eq "/"; # this should not happen, but ...
267 if($branch eq "/") {
268 $svnpath = "$trunk_name/$path";
269 } elsif($branch =~ m#^/#) {
270 $svnpath = "$tag_name$branch/$path";
271 } else {
272 $svnpath = "$branch_name/$branch/$path";
273 }
274
275 # now get it
276 my $name;
277 if($opt_d) {
278 my($req,$res);
279
280 # /svn/!svn/bc/2/django/trunk/django-docs/build.py
281 my $url=$svn_url->clone();
282 $url->path($url->path."/!svn/bc/$rev/$svn_dir$svnpath");
283 print "... $path...\n" if $opt_v;
284 $req = HTTP::Request->new(GET => $url);
285 $res = $lwp_ua->request($req);
286 if ($res->is_success) {
287 my $fh;
288 ($fh, $name) = tempfile('gitsvn.XXXXXX',
289 DIR => File::Spec->tmpdir(), UNLINK => 1);
290 print $fh $res->content;
291 close($fh) or die "Could not write $name: $!\n";
292 } else {
293 return undef if $res->code == 301; # directory?
294 die $res->status_line." at $url\n";
295 }
296 } else {
297 $name = $svn->file("/$svnpath",$rev);
298 return undef unless defined $name;
299 }
300
301 open my $F, '-|', "git-hash-object", "-w", $name
302 or die "Cannot create object: $!\n";
303 my $sha = <$F>;
304 chomp $sha;
305 close $F;
306 unlink $name;
307 my $mode = "0644"; # SV does not seem to store any file modes
308 return [$mode, $sha, $path];
309}
310
311sub split_path($$) {
312 my($rev,$path) = @_;
313 my $branch;
314
315 if($path =~ s#^/\Q$tag_name\E/([^/]+)/?##) {
316 $branch = "/$1";
317 } elsif($path =~ s#^/\Q$trunk_name\E/?##) {
318 $branch = "/";
319 } elsif($path =~ s#^/\Q$branch_name\E/([^/]+)/?##) {
320 $branch = $1;
321 } else {
322 print STDERR "$rev: Unrecognized path: $path\n";
323 return ()
324 }
325 $path = "/" if $path eq "";
326 return ($branch,$path);
327}
328
329sub copy_subdir($$$$$$) {
330 # Somebody copied a whole subdirectory.
331 # We need to find the index entries from the old version which the
332 # SVN log entry points to, and add them to the new place.
333
334 my($newrev,$newbranch,$path,$oldpath,$rev,$new) = @_;
335 my($branch,$srcpath) = split_path($rev,$oldpath);
336
337 my $gitrev = $branches{$branch}{$rev};
338 unless($gitrev) {
339 print STDERR "$newrev:$newbranch: could not find $oldpath \@ $rev\n";
340 return;
341 }
342 print "$newrev:$newbranch:$path: copying from $branch:$srcpath @ $rev\n" if $opt_v;
343 $srcpath =~ s#/*$#/#;
344 open my $f,"-|","git-ls-tree","-r","-z",$gitrev,$srcpath;
345 local $/ = "\0";
346 while(<$f>) {
347 chomp;
348 my($m,$p) = split(/\t/,$_,2);
349 my($mode,$type,$sha1) = split(/ /,$m);
350 next if $type ne "blob";
351 $p = substr($p,length($srcpath)-1);
352 print "... found $path$p ...\n" if $opt_v;
353 push(@$new,[$mode,$sha1,$path.$p]);
354 }
355 close($f) or
356 print STDERR "$newrev:$newbranch: could not list files in $oldpath \@ $rev\n";
357}
358
359sub commit {
360 my($branch, $changed_paths, $revision, $author, $date, $message) = @_;
361 my($author_name,$author_email,$dest);
362 my(@old,@new);
363
364 if (not defined $author) {
365 $author_name = $author_email = "unknown";
366 } elsif ($author =~ /^(.*?)\s+<(.*)>$/) {
367 ($author_name, $author_email) = ($1, $2);
368 } else {
369 $author =~ s/^<(.*)>$/$1/;
370 $author_name = $author_email = $author;
371 }
372 $date = pdate($date);
373
374 my $tag;
375 my $parent;
376 if($branch eq "/") { # trunk
377 $parent = $opt_o;
378 } elsif($branch =~ m#^/(.+)#) { # tag
379 $tag = 1;
380 $parent = $1;
381 } else { # "normal" branch
382 # nothing to do
383 $parent = $branch;
384 }
385 $dest = $parent;
386
387 my $prev = $changed_paths->{"/"};
388 if($prev and $prev->[0] eq "A") {
389 delete $changed_paths->{"/"};
390 my $oldpath = $prev->[1];
391 my $rev;
392 if(defined $oldpath) {
393 my $p;
394 ($parent,$p) = split_path($revision,$oldpath);
395 if($parent eq "/") {
396 $parent = $opt_o;
397 } else {
398 $parent =~ s#^/##; # if it's a tag
399 }
400 } else {
401 $parent = undef;
402 }
403 }
404
405 my $rev;
406 if($revision > $opt_s and defined $parent) {
407 open(H,"git-rev-parse --verify $parent |");
408 $rev = <H>;
409 close(H) or do {
410 print STDERR "$revision: cannot find commit '$parent'!\n";
411 return;
412 };
413 chop $rev;
414 if(length($rev) != 40) {
415 print STDERR "$revision: cannot find commit '$parent'!\n";
416 return;
417 }
418 $rev = $branches{($parent eq $opt_o) ? "/" : $parent}{"LAST"};
419 if($revision != $opt_s and not $rev) {
420 print STDERR "$revision: do not know ancestor for '$parent'!\n";
421 return;
422 }
423 } else {
424 $rev = undef;
425 }
426
427# if($prev and $prev->[0] eq "A") {
428# if(not $tag) {
429# unless(open(H,"> $git_dir/refs/heads/$branch")) {
430# print STDERR "$revision: Could not create branch $branch: $!\n";
431# $state=11;
432# next;
433# }
434# print H "$rev\n"
435# or die "Could not write branch $branch: $!";
436# close(H)
437# or die "Could not write branch $branch: $!";
438# }
439# }
440 if(not defined $rev) {
441 unlink($git_index);
442 } elsif ($rev ne $last_rev) {
443 print "Switching from $last_rev to $rev ($branch)\n" if $opt_v;
444 system("git-read-tree", $rev);
445 die "read-tree failed for $rev: $?\n" if $?;
446 $last_rev = $rev;
447 }
448
449 my $cid;
450 if($tag and not %$changed_paths) {
451 $cid = $rev;
452 } else {
453 my @paths = sort keys %$changed_paths;
454 foreach my $path(@paths) {
455 my $action = $changed_paths->{$path};
456
457 if ($action->[0] eq "A") {
458 my $f = get_file($revision,$branch,$path);
459 if($f) {
460 push(@new,$f) if $f;
461 } elsif($action->[1]) {
462 copy_subdir($revision,$branch,$path,$action->[1],$action->[2],\@new);
463 } else {
464 my $opath = $action->[3];
465 print STDERR "$revision: $branch: could not fetch '$opath'\n";
466 }
467 } elsif ($action->[0] eq "D") {
468 push(@old,$path);
469 } elsif ($action->[0] eq "M") {
470 my $f = get_file($revision,$branch,$path);
471 push(@new,$f) if $f;
472 } elsif ($action->[0] eq "R") {
473 # refer to a file/tree in an earlier commit
474 push(@old,$path); # remove any old stuff
475
476 # ... and add any new stuff
477 my($b,$srcpath) = split_path($revision,$action->[1]);
478 $srcpath =~ s#/*$#/#;
479 open my $F,"-|","git-ls-tree","-r","-z", $branches{$b}{$action->[2]}, $srcpath;
480 local $/ = "\0";
481 while(<$F>) {
482 chomp;
483 my($m,$p) = split(/\t/,$_,2);
484 my($mode,$type,$sha1) = split(/ /,$m);
485 next if $type ne "blob";
486 $p = substr($p,length($srcpath)-1);
487 push(@new,[$mode,$sha1,$path.$p]);
488 }
489 close($F);
490 } else {
491 die "$revision: unknown action '".$action->[0]."' for $path\n";
492 }
493 }
494
495 if(@old) {
496 open my $F, "-|", "git-ls-files", "-z", @old or die $!;
497 @old = ();
498 local $/ = "\0";
499 while(<$F>) {
500 chomp;
501 push(@old,$_);
502 }
503 close($F);
504
505 while(@old) {
506 my @o2;
507 if(@old > 55) {
508 @o2 = splice(@old,0,50);
509 } else {
510 @o2 = @old;
511 @old = ();
512 }
513 system("git-update-index","--force-remove","--",@o2);
514 die "Cannot remove files: $?\n" if $?;
515 }
516 }
517 while(@new) {
518 my @n2;
519 if(@new > 12) {
520 @n2 = splice(@new,0,10);
521 } else {
522 @n2 = @new;
523 @new = ();
524 }
525 system("git-update-index","--add",
526 (map { ('--cacheinfo', @$_) } @n2));
527 die "Cannot add files: $?\n" if $?;
528 }
529
530 my $pid = open(C,"-|");
531 die "Cannot fork: $!" unless defined $pid;
532 unless($pid) {
533 exec("git-write-tree");
534 die "Cannot exec git-write-tree: $!\n";
535 }
536 chomp(my $tree = <C>);
537 length($tree) == 40
538 or die "Cannot get tree id ($tree): $!\n";
539 close(C)
540 or die "Error running git-write-tree: $?\n";
541 print "Tree ID $tree\n" if $opt_v;
542
543 my $pr = IO::Pipe->new() or die "Cannot open pipe: $!\n";
544 my $pw = IO::Pipe->new() or die "Cannot open pipe: $!\n";
545 $pid = fork();
546 die "Fork: $!\n" unless defined $pid;
547 unless($pid) {
548 $pr->writer();
549 $pw->reader();
550 open(OUT,">&STDOUT");
551 dup2($pw->fileno(),0);
552 dup2($pr->fileno(),1);
553 $pr->close();
554 $pw->close();
555
556 my @par = ();
557 @par = ("-p",$rev) if defined $rev;
558
559 # loose detection of merges
560 # based on the commit msg
561 foreach my $rx (@mergerx) {
562 if ($message =~ $rx) {
563 my $mparent = $1;
564 if ($mparent eq 'HEAD') { $mparent = $opt_o };
565 if ( -e "$git_dir/refs/heads/$mparent") {
566 $mparent = get_headref($mparent, $git_dir);
567 push @par, '-p', $mparent;
568 print OUT "Merge parent branch: $mparent\n" if $opt_v;
569 }
570 }
571 }
572
573 exec("env",
574 "GIT_AUTHOR_NAME=$author_name",
575 "GIT_AUTHOR_EMAIL=$author_email",
576 "GIT_AUTHOR_DATE=".strftime("+0000 %Y-%m-%d %H:%M:%S",gmtime($date)),
577 "GIT_COMMITTER_NAME=$author_name",
578 "GIT_COMMITTER_EMAIL=$author_email",
579 "GIT_COMMITTER_DATE=".strftime("+0000 %Y-%m-%d %H:%M:%S",gmtime($date)),
580 "git-commit-tree", $tree,@par);
581 die "Cannot exec git-commit-tree: $!\n";
582 }
583 $pw->writer();
584 $pr->reader();
585
586 $message =~ s/[\s\n]+\z//;
587
588 print $pw "$message\n"
589 or die "Error writing to git-commit-tree: $!\n";
590 $pw->close();
591
592 print "Committed change $revision:$branch ".strftime("%Y-%m-%d %H:%M:%S",gmtime($date)).")\n" if $opt_v;
593 chomp($cid = <$pr>);
594 length($cid) == 40
595 or die "Cannot get commit id ($cid): $!\n";
596 print "Commit ID $cid\n" if $opt_v;
597 $pr->close();
598
599 waitpid($pid,0);
600 die "Error running git-commit-tree: $?\n" if $?;
601 }
602
603 if(not defined $dest) {
604 print "... no known parent\n" if $opt_v;
605 } elsif(not $tag) {
606 print "Writing to refs/heads/$dest\n" if $opt_v;
607 open(C,">$git_dir/refs/heads/$dest") and
608 print C ("$cid\n") and
609 close(C)
610 or die "Cannot write branch $dest for update: $!\n";
611 }
612
613 if($tag) {
614 my($in, $out) = ('','');
615 $last_rev = "-" if %$changed_paths;
616 # the tag was 'complex', i.e. did not refer to a "real" revision
617
618 $dest =~ tr/_/\./ if $opt_u;
619
620 my $pid = open2($in, $out, 'git-mktag');
621 print $out ("object $cid\n".
622 "type commit\n".
623 "tag $dest\n".
624 "tagger $author_name <$author_email>\n") and
625 close($out)
626 or die "Cannot create tag object $dest: $!\n";
627
628 my $tagobj = <$in>;
629 chomp $tagobj;
630
631 if ( !close($in) or waitpid($pid, 0) != $pid or
632 $? != 0 or $tagobj !~ /^[0123456789abcdef]{40}$/ ) {
633 die "Cannot create tag object $dest: $!\n";
634 }
635
636 open(C,">$git_dir/refs/tags/$dest") and
637 print C ("$tagobj\n") and
638 close(C)
639 or die "Cannot create tag $branch: $!\n";
640
641 print "Created tag '$dest' on '$branch'\n" if $opt_v;
642 }
643 $branches{$branch}{"LAST"} = $cid;
644 $branches{$branch}{$revision} = $cid;
645 $last_rev = $cid;
646 print BRANCHES "$revision $branch $cid\n";
647 print "DONE: $revision $dest $cid\n" if $opt_v;
648}
649
650my ($changed_paths, $revision, $author, $date, $message, $pool) = @_;
651sub _commit_all {
652 ($changed_paths, $revision, $author, $date, $message, $pool) = @_;
653 my %p;
654 while(my($path,$action) = each %$changed_paths) {
655 $p{$path} = [ $action->action,$action->copyfrom_path, $action->copyfrom_rev, $path ];
656 }
657 $changed_paths = \%p;
658}
659
660sub commit_all {
661 my %done;
662 my @col;
663 my $pref;
664 my $branch;
665
666 while(my($path,$action) = each %$changed_paths) {
667 ($branch,$path) = split_path($revision,$path);
668 next if not defined $branch;
669 $done{$branch}{$path} = $action;
670 }
671 while(($branch,$changed_paths) = each %done) {
672 commit($branch, $changed_paths, $revision, $author, $date, $message);
673 }
674}
675
676while(++$current_rev <= $svn->{'maxrev'}) {
677 $svn->{'svn'}->get_log("/",$current_rev,$current_rev,$current_rev,1,1,\&_commit_all,"");
678 commit_all();
679 if($opt_l and not --$opt_l) {
680 print STDERR "Stopping, because there is a memory leak (in the SVN library).\n";
681 print STDERR "Please repeat this command; it will continue safely\n";
682 last;
683 }
684}
685
686
687unlink($git_index);
688
689if (defined $orig_git_index) {
690 $ENV{GIT_INDEX_FILE} = $orig_git_index;
691} else {
692 delete $ENV{GIT_INDEX_FILE};
693}
694
695# Now switch back to the branch we were in before all of this happened
696if($orig_branch) {
697 print "DONE\n" if $opt_v and (not defined $opt_l or $opt_l > 0);
698 system("cp","$git_dir/refs/heads/$opt_o","$git_dir/refs/heads/master")
699 if $forward_master;
700 unless ($opt_i) {
701 system('git-read-tree', '-m', '-u', 'SVN2GIT_HEAD', 'HEAD');
702 die "read-tree failed: $?\n" if $?;
703 }
704} else {
705 $orig_branch = "master";
706 print "DONE; creating $orig_branch branch\n" if $opt_v and (not defined $opt_l or $opt_l > 0);
707 system("cp","$git_dir/refs/heads/$opt_o","$git_dir/refs/heads/master")
708 unless -f "$git_dir/refs/heads/master";
709 unlink("$git_dir/HEAD");
710 symlink("refs/heads/$orig_branch","$git_dir/HEAD");
711 unless ($opt_i) {
712 system('git checkout');
713 die "checkout failed: $?\n" if $?;
714 }
715}
716unlink("$git_dir/SVN2GIT_HEAD");
717close(BRANCHES);