[thirdparty/git.git] / git-cvsimport-script

#!/usr/bin/perl -w

# This tool is copyright (c) 2005, Matthias Urlichs.
# It is released under the Gnu Public License, version 2.
#
# The basic idea is to aggregate CVS check-ins into related changes.
# Fortunately, "cvsps" does that for us; all we have to do is to parse
# its output.
#
# Checking out the files is done by a single long-running CVS connection
# / server process.
#
# The head revision is on branch "origin" by default.
# You can change that with the '-o' option.

use strict;
use warnings;
use Getopt::Std;
use File::Path qw(mkpath);
use File::Basename qw(basename dirname);
use Time::Local;
use IO::Socket;
use IO::Pipe;
use POSIX qw(strftime dup2);

$SIG{'PIPE'}="IGNORE";
$ENV{'TZ'}="UTC";

our($opt_h,$opt_o,$opt_v,$opt_d,$opt_p,$opt_C);

sub usage() {
	print STDERR <<END;
Usage: ${\basename $0}     # fetch/update GIT from CVS
	   [ -o branch-for-HEAD ] [ -h ] [ -v ] [ -d CVSROOT ]
       [ -p opts-for-cvsps ] [ -C GIT_repository ]
       [ CVS_module ]
END
	exit(1);
}

getopts("hqvo:d:p:C:") or usage();
usage if $opt_h;

@ARGV <= 1 or usage();

if($opt_d) {
	$ENV{"CVSROOT"} = $opt_d;
} elsif(-f 'CVS/Root') {
	open my $f, '<', 'CVS/Root' or die 'Failed to open CVS/Root';
	$opt_d = <$f>;
	chomp $opt_d;
	close $f;
	$ENV{"CVSROOT"} = $opt_d;
} elsif($ENV{"CVSROOT"}) {
	$opt_d = $ENV{"CVSROOT"};
} else {
	die "CVSROOT needs to be set";
}
$opt_o ||= "origin";
my $git_tree = $opt_C;
$git_tree ||= ".";

my $cvs_tree;
if ($#ARGV == 0) {
	$cvs_tree = $ARGV[0];
} elsif (-f 'CVS/Repository') {
	open my $f, '<', 'CVS/Repository' or 
	    die 'Failed to open CVS/Repository';
	$cvs_tree = <$f>;
	chomp $cvs_tree;
	close $f
} else {
	usage();
}

select(STDERR); $|=1; select(STDOUT);


package CVSconn;
# Basic CVS dialog.
# We're only interested in connecting and downloading, so ...

use POSIX qw(strftime dup2);

sub new {
	my($what,$repo,$subdir) = @_;
	$what=ref($what) if ref($what);

	my $self = {};
	$self->{'buffer'} = "";
	bless($self,$what);

	$repo =~ s#/+$##;
	$self->{'fullrep'} = $repo;
	$self->conn();

	$self->{'subdir'} = $subdir;
	$self->{'lines'} = undef;

	return $self;
}

sub conn {
	my $self = shift;
	my $repo = $self->{'fullrep'};
	if($repo =~ s/^:pserver:(?:(.*?)(?::(.*?))?@)?([^:\/]*)(?::(\d*))?//) {
		my($user,$pass,$serv,$port) = ($1,$2,$3,$4);
		$user="anonymous" unless defined $user;
		my $rr2 = "-";
		unless($port) {
			$rr2 = ":pserver:$user\@$serv:$repo";
			$port=2401;
		}
		my $rr = ":pserver:$user\@$serv:$port$repo";

		unless($pass) {
			open(H,$ENV{'HOME'}."/.cvspass") and do {
				# :pserver:cvs@mea.tmt.tele.fi:/cvsroot/zmailer Ah<Z
				while(<H>) {
					chomp;
					s/^\/\d+\s+//;
					my ($w,$p) = split(/\s/,$_,2);
					if($w eq $rr or $w eq $rr2) {
						$pass = $p;
						last;
					}
				}
			};
		}
		$pass="A" unless $pass;

		my $s = IO::Socket::INET->new(PeerHost => $serv, PeerPort => $port);
		die "Socket to $serv: $!\n" unless defined $s;
		$s->write("BEGIN AUTH REQUEST\n$repo\n$user\n$pass\nEND AUTH REQUEST\n")
			or die "Write to $serv: $!\n";
		$s->flush();

		my $rep = <$s>;

		if($rep ne "I LOVE YOU\n") {
			$rep="<unknown>" unless $rep;
			die "AuthReply: $rep\n";
		}
		$self->{'socketo'} = $s;
		$self->{'socketi'} = $s;
	} else { # local: Fork off our own cvs server.
		my $pr = IO::Pipe->new();
		my $pw = IO::Pipe->new();
		my $pid = fork();
		die "Fork: $!\n" unless defined $pid;
		my $cvs = 'cvs';
		$cvs = $ENV{CVS_SERVER} if exists $ENV{CVS_SERVER};
		unless($pid) {
			$pr->writer();
			$pw->reader();
			dup2($pw->fileno(),0);
			dup2($pr->fileno(),1);
			$pr->close();
			$pw->close();
			exec($cvs,"server");
		}
		$pw->writer();
		$pr->reader();
		$self->{'socketo'} = $pw;
		$self->{'socketi'} = $pr;
	}
	$self->{'socketo'}->write("Root $repo\n");

	# Trial and error says that this probably is the minimum set
	$self->{'socketo'}->write("Valid-responses ok error Valid-requests Mode M Mbinary E F Checked-in Created Updated Merged Removed\n");

	$self->{'socketo'}->write("valid-requests\n");
	$self->{'socketo'}->flush();

	chomp(my $rep=$self->readline());
	if($rep !~ s/^Valid-requests\s*//) {
		$rep="<unknown>" unless $rep;
		die "Expected Valid-requests from server, but got: $rep\n";
	}
	chomp(my $res=$self->readline());
	die "validReply: $res\n" if $res ne "ok";

	$self->{'socketo'}->write("UseUnchanged\n") if $rep =~ /\bUseUnchanged\b/;
	$self->{'repo'} = $repo;
}

sub readline {
	my($self) = @_;
	return $self->{'socketi'}->getline();
}

sub _file {
	# Request a file with a given revision.
	# Trial and error says this is a good way to do it. :-/
	my($self,$fn,$rev) = @_;
	$self->{'socketo'}->write("Argument -N\n") or return undef;
	$self->{'socketo'}->write("Argument -P\n") or return undef;
	# $self->{'socketo'}->write("Argument -ko\n") or return undef;
	# -ko: Linus' version doesn't use it
	$self->{'socketo'}->write("Argument -r\n") or return undef;
	$self->{'socketo'}->write("Argument $rev\n") or return undef;
	$self->{'socketo'}->write("Argument --\n") or return undef;
	$self->{'socketo'}->write("Argument $self->{'subdir'}/$fn\n") or return undef;
	$self->{'socketo'}->write("Directory .\n") or return undef;
	$self->{'socketo'}->write("$self->{'repo'}\n") or return undef;
	# $self->{'socketo'}->write("Sticky T1.0\n") or return undef;
	$self->{'socketo'}->write("co\n") or return undef;
	$self->{'socketo'}->flush() or return undef;
	$self->{'lines'} = 0;
	return 1;
}
sub _line {
	# Read a line from the server.
	# ... except that 'line' may be an entire file. ;-)
	my($self) = @_;
	die "Not in lines" unless defined $self->{'lines'};

	my $line;
	my $res="";
	while(defined($line = $self->readline())) {
		# M U gnupg-cvs-rep/AUTHORS
		# Updated gnupg-cvs-rep/
		# /daten/src/rsync/gnupg-cvs-rep/AUTHORS
		# /AUTHORS/1.1///T1.1
		# u=rw,g=rw,o=rw
		# 0
		# ok

		if($line =~ s/^(?:Created|Updated) //) {
			$line = $self->readline(); # path
			$line = $self->readline(); # Entries line
			my $mode = $self->readline(); chomp $mode;
			$self->{'mode'} = $mode;
			defined (my $cnt = $self->readline())
				or die "EOF from server after 'Changed'\n";
			chomp $cnt;
			die "Duh: Filesize $cnt" if $cnt !~ /^\d+$/;
			$line="";
			$res="";
			while($cnt) {
				my $buf;
				my $num = $self->{'socketi'}->read($buf,$cnt);
				die "Server: Filesize $cnt: $num: $!\n" if not defined $num or $num<=0;
				$res .= $buf;
				$cnt -= $num;
			}
		} elsif($line =~ s/^ //) {
			$res .= $line;
		} elsif($line =~ /^M\b/) {
			# output, do nothing
		} elsif($line =~ /^Mbinary\b/) {
			my $cnt;
			die "EOF from server after 'Mbinary'" unless defined ($cnt = $self->readline());
			chomp $cnt;
			die "Duh: Mbinary $cnt" if $cnt !~ /^\d+$/ or $cnt<1;
			$line="";
			while($cnt) {
				my $buf;
				my $num = $self->{'socketi'}->read($buf,$cnt);
				die "S: Mbinary $cnt: $num: $!\n" if not defined $num or $num<=0;
				$res .= $buf;
				$cnt -= $num;
			}
		} else {
			chomp $line;
			if($line eq "ok") {
				# print STDERR "S: ok (".length($res).")\n";
				return $res;
			} elsif($line =~ s/^E //) {
				# print STDERR "S: $line\n";
			} else {
				die "Unknown: $line\n";
			}
		}
	}
}
sub file {
	my($self,$fn,$rev) = @_;
	my $res;

	if ($self->_file($fn,$rev)) {
		$res = $self->_line();
		return $res if defined $res;
	}

	# retry
	$self->conn();
	$self->_file($fn,$rev)
		or die "No file command send\n";
	$res = $self->_line();
	die "No input: $fn $rev\n" unless defined $res;
	return $res;
}


package main;

my $cvs = CVSconn->new($opt_d, $cvs_tree);


sub pdate($) {
	my($d) = @_;
	m#(\d{2,4})/(\d\d)/(\d\d)\s(\d\d):(\d\d)(?::(\d\d))?#
		or die "Unparseable date: $d\n";
	my $y=$1; $y-=1900 if $y>1900;
	return timegm($6||0,$5,$4,$3,$2-1,$y);
}

sub pmode($) {
	my($mode) = @_;
	my $m = 0;
	my $mm = 0;
	my $um = 0;
	for my $x(split(//,$mode)) {
		if($x eq ",") {
			$m |= $mm&$um;
			$mm = 0;
			$um = 0;
		} elsif($x eq "u") { $um |= 0700;
		} elsif($x eq "g") { $um |= 0070;
		} elsif($x eq "o") { $um |= 0007;
		} elsif($x eq "r") { $mm |= 0444;
		} elsif($x eq "w") { $mm |= 0222;
		} elsif($x eq "x") { $mm |= 0111;
		} elsif($x eq "=") { # do nothing
		} else { die "Unknown mode: $mode\n";
		}
	}
	$m |= $mm&$um;
	return $m;
}

my $tmpcv = "/var/cache/cvs";

sub getwd() {
	my $pwd = `pwd`;
	chomp $pwd;
	return $pwd;
}

-d $git_tree
	or mkdir($git_tree,0777)
	or die "Could not create $git_tree: $!";
chdir($git_tree);

my $last_branch = "";
my $orig_branch = "";
my %branch_date;

my $git_dir = $ENV{"GIT_DIR"} || ".git";
$git_dir = getwd()."/".$git_dir unless $git_dir =~ m#^/#;
$ENV{"GIT_DIR"} = $git_dir;
unless(-d $git_dir) {
	system("git-init-db");
	die "Cannot init the GIT db at $git_tree: $?\n" if $?;
	system("git-read-tree");
	die "Cannot init an empty tree: $?\n" if $?;

	$last_branch = $opt_o;
	$orig_branch = "";
} else {
	-f "$git_dir/refs/head/$opt_o"
		or die "Branch '$opt_o' does not exist.\n".
		       "Either use the correct '-o branch' option,\n".
		       "or import to a new repository.\n";

	$last_branch = basename(readlink("$git_dir/HEAD"));
	unless($last_branch) {
		warn "Cannot read the last branch name: $! -- assuming 'master'\n";
		$last_branch = "master";
	}
	$orig_branch = $last_branch;

	# Get the last import timestamps
	opendir(D,"$git_dir/refs/heads");
	while(defined(my $head = readdir(D))) {
		next if $head =~ /^\./;
		open(F,"$git_dir/refs/heads/$head")
			or die "Bad head branch: $head: $!\n";
		chomp(my $ftag = <F>);
		close(F);
		open(F,"git-cat-file commit $ftag |");
		while(<F>) {
			next unless /^author\s.*\s(\d+)\s[-+]\d{4}$/;
			$branch_date{$head} = $1;
			last;
		}
		close(F);
	}
	closedir(D);
}

-d $git_dir
	or die "Could not create git subdir ($git_dir).\n";

my $pid = open(CVS,"-|");
die "Cannot fork: $!\n" unless defined $pid;
unless($pid) {
	my @opt;
	@opt = split(/,/,$opt_p) if defined $opt_p;
	exec("cvsps",@opt,"-x","-A","--cvs-direct",'--root',$opt_d,$cvs_tree);
	die "Could not start cvsps: $!\n";
}


## cvsps output:
#---------------------
#PatchSet 314
#Date: 1999/09/18 13:03:59
#Author: wkoch
#Branch: STABLE-BRANCH-1-0
#Ancestor branch: HEAD
#Tag: (none)
#Log:
#    See ChangeLog: Sat Sep 18 13:03:28 CEST 1999  Werner Koch
#Members:
#	README:1.57->1.57.2.1
#	VERSION:1.96->1.96.2.1
#
#---------------------

my $state = 0;

my($patchset,$date,$author,$branch,$ancestor,$tag,$logmsg);
my(@old,@new);
my $commit = sub {
	my $pid;
	while(@old) {
		my @o2;
		if(@old > 55) {
			@o2 = splice(@old,0,50);
		} else {
			@o2 = @old;
			@old = ();
		}
		system("git-update-cache","--force-remove","--",@o2);
		die "Cannot remove files: $?\n" if $?;
	}
	while(@new) {
		my @n2;
		if(@new > 55) {
			@n2 = splice(@new,0,50);
		} else {
			@n2 = @new;
			@new = ();
		}
		system("git-update-cache","--add","--",@n2);
		die "Cannot add files: $?\n" if $?;
	}

	$pid = open(C,"-|");
	die "Cannot fork: $!" unless defined $pid;
	unless($pid) {
		exec("git-write-tree");
		die "Cannot exec git-write-tree: $!\n";
	}
	chomp(my $tree = <C>);
	length($tree) == 40
		or die "Cannot get tree id ($tree): $!\n";
	close(C)
		or die "Error running git-write-tree: $?\n";
	print "Tree ID $tree\n" if $opt_v;

	my $parent = "";
	if(open(C,"$git_dir/refs/heads/$last_branch")) {
		chomp($parent = <C>);
		close(C);
		length($parent) == 40
			or die "Cannot get parent id ($parent): $!\n";
		print "Parent ID $parent\n" if $opt_v;
	}

	my $pr = IO::Pipe->new();
	my $pw = IO::Pipe->new();
	$pid = fork();
	die "Fork: $!\n" unless defined $pid;
	unless($pid) {
		$pr->writer();
		$pw->reader();
		dup2($pw->fileno(),0);
		dup2($pr->fileno(),1);
		$pr->close();
		$pw->close();

		my @par = ();
		@par = ("-p",$parent) if $parent;
		exec("env",
			"GIT_AUTHOR_NAME=$author",
			"GIT_AUTHOR_EMAIL=$author",
			"GIT_AUTHOR_DATE=".strftime("+0000 %Y-%m-%d %H:%M:%S",gmtime($date)),
			"GIT_COMMITTER_NAME=$author",
			"GIT_COMMITTER_EMAIL=$author",
			"GIT_COMMITTER_DATE=".strftime("+0000 %Y-%m-%d %H:%M:%S",gmtime($date)),
			"git-commit-tree", $tree,@par);
		die "Cannot exec git-commit-tree: $!\n";
	}
	$pw->writer();
	$pr->reader();

	# compatibility with git2cvs
	substr($logmsg,32767) = "" if length($logmsg) > 32767;
	$logmsg =~ s/[\s\n]+\z//;

	print $pw "$logmsg\n"
		or die "Error writing to git-commit-tree: $!\n";
	$pw->close();

	print "Committed patch $patchset ($branch)\n" if $opt_v;
	chomp(my $cid = <$pr>);
	length($cid) == 40
		or die "Cannot get commit id ($cid): $!\n";
	print "Commit ID $cid\n" if $opt_v;
	$pr->close();

	waitpid($pid,0);
	die "Error running git-commit-tree: $?\n" if $?;

	open(C,">$git_dir/refs/heads/$branch")
		or die "Cannot open branch $branch for update: $!\n";
	print C "$cid\n"
		or die "Cannot write branch $branch for update: $!\n";
	close(C)
		or die "Cannot write branch $branch for update: $!\n";

	if($tag) {
		open(C,">$git_dir/refs/tags/$tag")
			or die "Cannot create tag $tag: $!\n";
		print C "$cid\n"
			or die "Cannot write tag $branch: $!\n";
		close(C)
			or die "Cannot write tag $branch: $!\n";
		print "Created tag '$tag' on '$branch'\n" if $opt_v;
	}
};

while(<CVS>) {
	chomp;
	if($state == 0 and /^-+$/) {
		$state = 1;
	} elsif($state == 0) {
		$state = 1;
		redo;
	} elsif(($state==0 or $state==1) and s/^PatchSet\s+//) {
		$patchset = 0+$_;
		$state=2;
	} elsif($state == 2 and s/^Date:\s+//) {
		$date = pdate($_);
		unless($date) {
			print STDERR "Could not parse date: $_\n";
			$state=0;
			next;
		}
		$state=3;
	} elsif($state == 3 and s/^Author:\s+//) {
		s/\s+$//;
		$author = $_;
		$state = 4;
	} elsif($state == 4 and s/^Branch:\s+//) {
		s/\s+$//;
		$branch = $_;
		$state = 5;
	} elsif($state == 5 and s/^Ancestor branch:\s+//) {
		s/\s+$//;
		$ancestor = $_;
		$ancestor = $opt_o if $ancestor eq "HEAD";
		$state = 6;
	} elsif($state == 5) {
		$ancestor = undef;
		$state = 6;
		redo;
	} elsif($state == 6 and s/^Tag:\s+//) {
		s/\s+$//;
		if($_ eq "(none)") {
			$tag = undef;
		} else {
			$tag = $_;
		}
		$state = 7;
	} elsif($state == 7 and /^Log:/) {
		$logmsg = "";
		$state = 8;
	} elsif($state == 8 and /^Members:/) {
		$branch = $opt_o if $branch eq "HEAD";
		if(defined $branch_date{$branch} and $branch_date{$branch} >= $date) {
			# skip
			print "skip patchset $patchset: $date before $branch_date{$branch}\n";
			$state = 11;
			next;
		}
		if($ancestor) {
			if(-f "$git_dir/refs/heads/$branch") {
				print STDERR "Branch $branch already exists!\n";
				$state=11;
				next;
			}
			unless(open(H,"$git_dir/refs/heads/$ancestor")) {
				print STDERR "Branch $ancestor does not exist!\n";
				$state=11;
				next;
			}
			chomp(my $id = <H>);
			close(H);
			unless(open(H,"> $git_dir/refs/heads/$branch")) {
				print STDERR "Could not create branch $branch: $!\n";
				$state=11;
				next;
			}
			print H "$id\n"
				or die "Could not write branch $branch: $!";
			close(H)
				or die "Could not write branch $branch: $!";
		}
		if(($ancestor || $branch) ne $last_branch) {
			print "Switching from $last_branch to $branch\n" if $opt_v;
			system("git-read-tree","-m","-u","$last_branch","$branch");
			die "read-tree failed: $?\n" if $?;
		}
		if($branch ne $last_branch) {
			unlink("$git_dir/HEAD");
			symlink("refs/heads/$branch","$git_dir/HEAD");
			$last_branch = $branch;
		}
		$state = 9;
	} elsif($state == 8) {
		$logmsg .= "$_\n";
	} elsif($state == 9 and /^\s+(\S+):(INITIAL|\d(?:\.\d+)+)->(\d(?:\.\d+)+)\s*$/) {
#	VERSION:1.96->1.96.2.1
		my $init = ($2 eq "INITIAL");
		my $fn = $1;
		my $rev = $3;
		$fn =~ s#^/+##;
		my $data = $cvs->file($fn,$rev);
		print "".($init ? "New" : "Update")." $fn: ".length($data)." bytes.\n";
		mkpath(dirname($fn),$opt_v);
		open(F,"> ./$fn")
			or die "Cannot create '$fn': $!\n";
		print F $data
			or die "Cannot write to '$fn': $!\n";
		close(F)
			or die "Cannot write to '$fn': $!\n";
		chmod(pmode($cvs->{'mode'}), $fn);
		push(@new,$fn); # may be resurrected!
	} elsif($state == 9 and /^\s+(\S+):\d(?:\.\d+)+->(\d(?:\.\d+)+)\(DEAD\)\s*$/) {
		my $fn = $1;
		$fn =~ s#^/+##;
		push(@old,$fn);
	} elsif($state == 9 and /^\s*$/) {
		$state = 10;
	} elsif(($state == 9 or $state == 10) and /^-+$/) {
		&$commit();
		$state = 1;
	} elsif($state == 11 and /^-+$/) {
		$state = 1;
	} elsif(/^-+$/) { # end of unknown-line processing
		$state = 1;
	} elsif($state != 11) { # ignore stuff when skipping
		print "* UNKNOWN LINE * $_\n";
	}
}
&$commit() if $branch and $state != 11;

# Now switch back to the branch we were in before all of this happened
if($orig_branch) {
	print "DONE; switching back to $orig_branch\n" if $opt_v;
} else {
	$orig_branch = "master";
	print "DONE; creating $orig_branch branch\n" if $opt_v;
	system("cp","$git_dir/refs/heads/$opt_o","$git_dir/refs/heads/master")
		unless -f "$git_dir/refs/heads/master";
}

system("git-read-tree","-m","-u","$last_branch","$orig_branch");
die "read-tree failed: $?\n" if $?;

unlink("$git_dir/HEAD");
symlink("refs/heads/$orig_branch","$git_dir/HEAD");
Commit	Line	Data
a57a9493	1	#!/usr/bin/perl -w
9718a00b	2
a57a9493 MU	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 aggregate CVS check-ins into related changes.
	7	# Fortunately, "cvsps" does that for us; all we have to do is to parse
	8	# its output.
	9	#
	10	# Checking out the files is done by a single long-running CVS connection
	11	# / server process.
	12	#
	13	# The head revision is on branch "origin" by default.
	14	# You can change that with the '-o' option.
	15
	16	use strict;
	17	use warnings;
	18	use Getopt::Std;
	19	use File::Path qw(mkpath);
	20	use File::Basename qw(basename dirname);
	21	use Time::Local;
2a3e1a85 MU	22	use IO::Socket;
	23	use IO::Pipe;
	24	use POSIX qw(strftime dup2);
a57a9493 MU	25
	26	$SIG{'PIPE'}="IGNORE";
	27	$ENV{'TZ'}="UTC";
	28
f9714a4a	29	our($opt_h,$opt_o,$opt_v,$opt_d,$opt_p,$opt_C);
a57a9493 MU	30
	31	sub usage() {
	32	print STDERR <<END;
2a3e1a85 MU	33	Usage: ${\basename $0} # fetch/update GIT from CVS
2a3e1a85 MU	34	[ -o branch-for-HEAD ] [ -h ] [ -v ] [ -d CVSROOT ]
f9714a4a SV	35	[ -p opts-for-cvsps ] [ -C GIT_repository ]
f9714a4a SV	36	[ CVS_module ]
a57a9493 MU	37	END
	38	exit(1);
	39	}
	40
f9714a4a	41	getopts("hqvo:d:p:C:") or usage();
a57a9493 MU	42	usage if $opt_h;
a57a9493 MU	43
f9714a4a	44	@ARGV <= 1 or usage();
a57a9493	45
2a3e1a85 MU	46	if($opt_d) {
2a3e1a85 MU	47	$ENV{"CVSROOT"} = $opt_d;
f9714a4a SV	48	} elsif(-f 'CVS/Root') {
	49	open my $f, '<', 'CVS/Root' or die 'Failed to open CVS/Root';
	50	$opt_d = <$f>;
	51	chomp $opt_d;
	52	close $f;
	53	$ENV{"CVSROOT"} = $opt_d;
2a3e1a85 MU	54	} elsif($ENV{"CVSROOT"}) {
	55	$opt_d = $ENV{"CVSROOT"};
	56	} else {
	57	die "CVSROOT needs to be set";
	58	}
	59	$opt_o \|\|= "origin";
f9714a4a	60	my $git_tree = $opt_C;
2a3e1a85 MU	61	$git_tree \|\|= ".";
2a3e1a85 MU	62
f9714a4a SV	63	my $cvs_tree;
	64	if ($#ARGV == 0) {
	65	$cvs_tree = $ARGV[0];
	66	} elsif (-f 'CVS/Repository') {
	67	open my $f, '<', 'CVS/Repository' or
	68	die 'Failed to open CVS/Repository';
	69	$cvs_tree = <$f>;
	70	chomp $cvs_tree;
	71	close $f
	72	} else {
	73	usage();
	74	}
	75
a57a9493 MU	76	select(STDERR); $\|=1; select(STDOUT);
	77
	78
	79	package CVSconn;
	80	# Basic CVS dialog.
2a3e1a85	81	# We're only interested in connecting and downloading, so ...
a57a9493	82
f65ae603 MU	83	use POSIX qw(strftime dup2);
f65ae603 MU	84
a57a9493 MU	85	sub new {
	86	my($what,$repo,$subdir) = @_;
	87	$what=ref($what) if ref($what);
	88
	89	my $self = {};
	90	$self->{'buffer'} = "";
	91	bless($self,$what);
	92
	93	$repo =~ s#/+$##;
	94	$self->{'fullrep'} = $repo;
	95	$self->conn();
	96
	97	$self->{'subdir'} = $subdir;
	98	$self->{'lines'} = undef;
	99
	100	return $self;
	101	}
	102
	103	sub conn {
	104	my $self = shift;
	105	my $repo = $self->{'fullrep'};
	106	if($repo =~ s/^:pserver:(?:(.?)(?::(.?))?@)?([^:\/])(?::(\d))?//) {
	107	my($user,$pass,$serv,$port) = ($1,$2,$3,$4);
	108	$user="anonymous" unless defined $user;
2a3e1a85	109	my $rr2 = "-";
a57a9493 MU	110	unless($port) {
	111	$rr2 = ":pserver:$user\@$serv:$repo";
	112	$port=2401;
	113	}
	114	my $rr = ":pserver:$user\@$serv:$port$repo";
	115
	116	unless($pass) {
	117	open(H,$ENV{'HOME'}."/.cvspass") and do {
	118	# :pserver:cvs@mea.tmt.tele.fi:/cvsroot/zmailer Ah<Z
	119	while(<H>) {
	120	chomp;
	121	s/^\/\d+\s+//;
	122	my ($w,$p) = split(/\s/,$_,2);
	123	if($w eq $rr or $w eq $rr2) {
	124	$pass = $p;
	125	last;
	126	}
	127	}
	128	};
	129	}
	130	$pass="A" unless $pass;
	131
a57a9493 MU	132	my $s = IO::Socket::INET->new(PeerHost => $serv, PeerPort => $port);
	133	die "Socket to $serv: $!\n" unless defined $s;
	134	$s->write("BEGIN AUTH REQUEST\n$repo\n$user\n$pass\nEND AUTH REQUEST\n")
	135	or die "Write to $serv: $!\n";
	136	$s->flush();
	137
	138	my $rep = <$s>;
	139
	140	if($rep ne "I LOVE YOU\n") {
	141	$rep="<unknown>" unless $rep;
	142	die "AuthReply: $rep\n";
	143	}
	144	$self->{'socketo'} = $s;
	145	$self->{'socketi'} = $s;
	146	} else { # local: Fork off our own cvs server.
a57a9493 MU	147	my $pr = IO::Pipe->new();
	148	my $pw = IO::Pipe->new();
	149	my $pid = fork();
	150	die "Fork: $!\n" unless defined $pid;
8d0ea311 SV	151	my $cvs = 'cvs';
8d0ea311 SV	152	$cvs = $ENV{CVS_SERVER} if exists $ENV{CVS_SERVER};
a57a9493 MU	153	unless($pid) {
	154	$pr->writer();
	155	$pw->reader();
a57a9493 MU	156	dup2($pw->fileno(),0);
	157	dup2($pr->fileno(),1);
	158	$pr->close();
	159	$pw->close();
8d0ea311	160	exec($cvs,"server");
a57a9493 MU	161	}
	162	$pw->writer();
	163	$pr->reader();
	164	$self->{'socketo'} = $pw;
	165	$self->{'socketi'} = $pr;
	166	}
	167	$self->{'socketo'}->write("Root $repo\n");
	168
	169	# Trial and error says that this probably is the minimum set
	170	$self->{'socketo'}->write("Valid-responses ok error Valid-requests Mode M Mbinary E F Checked-in Created Updated Merged Removed\n");
	171
	172	$self->{'socketo'}->write("valid-requests\n");
	173	$self->{'socketo'}->flush();
	174
	175	chomp(my $rep=$self->readline());
	176	if($rep !~ s/^Valid-requests\s*//) {
	177	$rep="<unknown>" unless $rep;
	178	die "Expected Valid-requests from server, but got: $rep\n";
	179	}
	180	chomp(my $res=$self->readline());
	181	die "validReply: $res\n" if $res ne "ok";
	182
	183	$self->{'socketo'}->write("UseUnchanged\n") if $rep =~ /\bUseUnchanged\b/;
	184	$self->{'repo'} = $repo;
	185	}
	186
	187	sub readline {
	188	my($self) = @_;
	189	return $self->{'socketi'}->getline();
	190	}
	191
	192	sub _file {
	193	# Request a file with a given revision.
	194	# Trial and error says this is a good way to do it. :-/
	195	my($self,$fn,$rev) = @_;
	196	$self->{'socketo'}->write("Argument -N\n") or return undef;
	197	$self->{'socketo'}->write("Argument -P\n") or return undef;
	198	# $self->{'socketo'}->write("Argument -ko\n") or return undef;
	199	# -ko: Linus' version doesn't use it
	200	$self->{'socketo'}->write("Argument -r\n") or return undef;
	201	$self->{'socketo'}->write("Argument $rev\n") or return undef;
	202	$self->{'socketo'}->write("Argument --\n") or return undef;
	203	$self->{'socketo'}->write("Argument $self->{'subdir'}/$fn\n") or return undef;
	204	$self->{'socketo'}->write("Directory .\n") or return undef;
	205	$self->{'socketo'}->write("$self->{'repo'}\n") or return undef;
4f7c0caa	206	# $self->{'socketo'}->write("Sticky T1.0\n") or return undef;
a57a9493 MU	207	$self->{'socketo'}->write("co\n") or return undef;
	208	$self->{'socketo'}->flush() or return undef;
	209	$self->{'lines'} = 0;
	210	return 1;
	211	}
	212	sub _line {
	213	# Read a line from the server.
	214	# ... except that 'line' may be an entire file. ;-)
	215	my($self) = @_;
	216	die "Not in lines" unless defined $self->{'lines'};
	217
	218	my $line;
	219	my $res="";
	220	while(defined($line = $self->readline())) {
	221	# M U gnupg-cvs-rep/AUTHORS
	222	# Updated gnupg-cvs-rep/
	223	# /daten/src/rsync/gnupg-cvs-rep/AUTHORS
	224	# /AUTHORS/1.1///T1.1
	225	# u=rw,g=rw,o=rw
	226	# 0
	227	# ok
	228
	229	if($line =~ s/^(?:Created\|Updated) //) {
	230	$line = $self->readline(); # path
	231	$line = $self->readline(); # Entries line
	232	my $mode = $self->readline(); chomp $mode;
	233	$self->{'mode'} = $mode;
	234	defined (my $cnt = $self->readline())
	235	or die "EOF from server after 'Changed'\n";
	236	chomp $cnt;
	237	die "Duh: Filesize $cnt" if $cnt !~ /^\d+$/;
	238	$line="";
	239	$res="";
	240	while($cnt) {
	241	my $buf;
	242	my $num = $self->{'socketi'}->read($buf,$cnt);
	243	die "Server: Filesize $cnt: $num: $!\n" if not defined $num or $num<=0;
	244	$res .= $buf;
	245	$cnt -= $num;
	246	}
	247	} elsif($line =~ s/^ //) {
	248	$res .= $line;
	249	} elsif($line =~ /^M\b/) {
	250	# output, do nothing
	251	} elsif($line =~ /^Mbinary\b/) {
	252	my $cnt;
	253	die "EOF from server after 'Mbinary'" unless defined ($cnt = $self->readline());
	254	chomp $cnt;
	255	die "Duh: Mbinary $cnt" if $cnt !~ /^\d+$/ or $cnt<1;
	256	$line="";
	257	while($cnt) {
	258	my $buf;
	259	my $num = $self->{'socketi'}->read($buf,$cnt);
	260	die "S: Mbinary $cnt: $num: $!\n" if not defined $num or $num<=0;
	261	$res .= $buf;
	262	$cnt -= $num;
	263	}
	264	} else {
	265	chomp $line;
	266	if($line eq "ok") {
	267	# print STDERR "S: ok (".length($res).")\n";
	268	return $res;
	269	} elsif($line =~ s/^E //) {
	270	# print STDERR "S: $line\n";
271	} else {
272	die "Unknown: $line\n";
273	}
274	}
275	}
276	}
277	sub file {
278	my($self,$fn,$rev) = @_;
279	my $res;
280
281	if ($self->_file($fn,$rev)) {
282	$res = $self->_line();
283	return $res if defined $res;
284	}
285
286	# retry
287	$self->conn();
288	$self->_file($fn,$rev)
289	or die "No file command send\n";
290	$res = $self->_line();
291	die "No input: $fn $rev\n" unless defined $res;
292	return $res;
293	}
294
295
296	package main;
297
2a3e1a85	298	my $cvs = CVSconn->new($opt_d, $cvs_tree);
a57a9493 MU	299
	300
	301	sub pdate($) {
	302	my($d) = @_;
	303	m#(\d{2,4})/(\d\d)/(\d\d)\s(\d\d):(\d\d)(?::(\d\d))?#
	304	or die "Unparseable date: $d\n";
	305	my $y=$1; $y-=1900 if $y>1900;
	306	return timegm($6\|\|0,$5,$4,$3,$2-1,$y);
9718a00b TM	307	}
9718a00b TM	308
a57a9493 MU	309	sub pmode($) {
	310	my($mode) = @_;
	311	my $m = 0;
	312	my $mm = 0;
	313	my $um = 0;
	314	for my $x(split(//,$mode)) {
	315	if($x eq ",") {
	316	$m \|= $mm&$um;
	317	$mm = 0;
	318	$um = 0;
	319	} elsif($x eq "u") { $um \|= 0700;
	320	} elsif($x eq "g") { $um \|= 0070;
	321	} elsif($x eq "o") { $um \|= 0007;
	322	} elsif($x eq "r") { $mm \|= 0444;
	323	} elsif($x eq "w") { $mm \|= 0222;
	324	} elsif($x eq "x") { $mm \|= 0111;
	325	} elsif($x eq "=") { # do nothing
	326	} else { die "Unknown mode: $mode\n";
	327	}
	328	}
	329	$m \|= $mm&$um;
	330	return $m;
	331	}
d4f8b390	332
a57a9493	333	my $tmpcv = "/var/cache/cvs";
d4f8b390	334
a57a9493 MU	335	sub getwd() {
	336	my $pwd = `pwd`;
	337	chomp $pwd;
	338	return $pwd;
d4f8b390 LT	339	}
d4f8b390 LT	340
a57a9493 MU	341	-d $git_tree
	342	or mkdir($git_tree,0777)
	343	or die "Could not create $git_tree: $!";
	344	chdir($git_tree);
d4f8b390	345
a57a9493	346	my $last_branch = "";
46541669	347	my $orig_branch = "";
a57a9493 MU	348	my %branch_date;
	349
	350	my $git_dir = $ENV{"GIT_DIR"} \|\| ".git";
	351	$git_dir = getwd()."/".$git_dir unless $git_dir =~ m#^/#;
	352	$ENV{"GIT_DIR"} = $git_dir;
	353	unless(-d $git_dir) {
	354	system("git-init-db");
	355	die "Cannot init the GIT db at $git_tree: $?\n" if $?;
	356	system("git-read-tree");
	357	die "Cannot init an empty tree: $?\n" if $?;
	358
	359	$last_branch = $opt_o;
46541669	360	$orig_branch = "";
a57a9493	361	} else {
4c24e089 MU	362	-f "$git_dir/refs/head/$opt_o"
	363	or die "Branch '$opt_o' does not exist.\n".
	364	"Either use the correct '-o branch' option,\n".
	365	"or import to a new repository.\n";
	366
a57a9493	367	$last_branch = basename(readlink("$git_dir/HEAD"));
46541669 MU	368	unless($last_branch) {
	369	warn "Cannot read the last branch name: $! -- assuming 'master'\n";
	370	$last_branch = "master";
	371	}
	372	$orig_branch = $last_branch;
a57a9493 MU	373
	374	# Get the last import timestamps
	375	opendir(D,"$git_dir/refs/heads");
	376	while(defined(my $head = readdir(D))) {
	377	next if $head =~ /^\./;
	378	open(F,"$git_dir/refs/heads/$head")
	379	or die "Bad head branch: $head: $!\n";
	380	chomp(my $ftag = <F>);
	381	close(F);
	382	open(F,"git-cat-file commit $ftag \|");
	383	while(<F>) {
	384	next unless /^author\s.*\s(\d+)\s[-+]\d{4}$/;
	385	$branch_date{$head} = $1;
	386	last;
	387	}
	388	close(F);
	389	}
	390	closedir(D);
	391	}
	392
	393	-d $git_dir
	394	or die "Could not create git subdir ($git_dir).\n";
	395
	396	my $pid = open(CVS,"-\|");
	397	die "Cannot fork: $!\n" unless defined $pid;
	398	unless($pid) {
2be4fcc3 MU	399	my @opt;
2be4fcc3 MU	400	@opt = split(/,/,$opt_p) if defined $opt_p;
f9714a4a	401	exec("cvsps",@opt,"-x","-A","--cvs-direct",'--root',$opt_d,$cvs_tree);
a57a9493 MU	402	die "Could not start cvsps: $!\n";
	403	}
	404
	405
	406	## cvsps output:
	407	#---------------------
	408	#PatchSet 314
	409	#Date: 1999/09/18 13:03:59
	410	#Author: wkoch
	411	#Branch: STABLE-BRANCH-1-0
	412	#Ancestor branch: HEAD
	413	#Tag: (none)
	414	#Log:
	415	# See ChangeLog: Sat Sep 18 13:03:28 CEST 1999 Werner Koch
	416	#Members:
	417	# README:1.57->1.57.2.1
	418	# VERSION:1.96->1.96.2.1
	419	#
	420	#---------------------
	421
	422	my $state = 0;
	423
	424	my($patchset,$date,$author,$branch,$ancestor,$tag,$logmsg);
	425	my(@old,@new);
	426	my $commit = sub {
	427	my $pid;
4abdecbf MU	428	while(@old) {
	429	my @o2;
	430	if(@old > 55) {
	431	@o2 = splice(@old,0,50);
	432	} else {
	433	@o2 = @old;
	434	@old = ();
	435	}
	436	system("git-update-cache","--force-remove","--",@o2);
	437	die "Cannot remove files: $?\n" if $?;
	438	}
	439	while(@new) {
	440	my @n2;
	441	if(@new > 55) {
	442	@n2 = splice(@new,0,50);
	443	} else {
	444	@n2 = @new;
	445	@new = ();
	446	}
	447	system("git-update-cache","--add","--",@n2);
	448	die "Cannot add files: $?\n" if $?;
	449	}
a57a9493 MU	450
	451	$pid = open(C,"-\|");
	452	die "Cannot fork: $!" unless defined $pid;
	453	unless($pid) {
	454	exec("git-write-tree");
	455	die "Cannot exec git-write-tree: $!\n";
	456	}
	457	chomp(my $tree = <C>);
	458	length($tree) == 40
	459	or die "Cannot get tree id ($tree): $!\n";
	460	close(C)
	461	or die "Error running git-write-tree: $?\n";
	462	print "Tree ID $tree\n" if $opt_v;
	463
	464	my $parent = "";
	465	if(open(C,"$git_dir/refs/heads/$last_branch")) {
	466	chomp($parent = <C>);
	467	close(C);
	468	length($parent) == 40
	469	or die "Cannot get parent id ($parent): $!\n";
	470	print "Parent ID $parent\n" if $opt_v;
	471	}
	472
2a3e1a85 MU	473	my $pr = IO::Pipe->new();
	474	my $pw = IO::Pipe->new();
	475	$pid = fork();
	476	die "Fork: $!\n" unless defined $pid;
a57a9493	477	unless($pid) {
2a3e1a85 MU	478	$pr->writer();
	479	$pw->reader();
	480	dup2($pw->fileno(),0);
	481	dup2($pr->fileno(),1);
	482	$pr->close();
	483	$pw->close();
	484
a57a9493 MU	485	my @par = ();
	486	@par = ("-p",$parent) if $parent;
	487	exec("env",
	488	"GIT_AUTHOR_NAME=$author",
	489	"GIT_AUTHOR_EMAIL=$author",
	490	"GIT_AUTHOR_DATE=".strftime("+0000 %Y-%m-%d %H:%M:%S",gmtime($date)),
	491	"GIT_COMMITTER_NAME=$author",
	492	"GIT_COMMITTER_EMAIL=$author",
	493	"GIT_COMMITTER_DATE=".strftime("+0000 %Y-%m-%d %H:%M:%S",gmtime($date)),
	494	"git-commit-tree", $tree,@par);
	495	die "Cannot exec git-commit-tree: $!\n";
	496	}
2a3e1a85 MU	497	$pw->writer();
2a3e1a85 MU	498	$pr->reader();
e371046b MU	499
	500	# compatibility with git2cvs
	501	substr($logmsg,32767) = "" if length($logmsg) > 32767;
	502	$logmsg =~ s/[\s\n]+\z//;
	503
	504	print $pw "$logmsg\n"
a57a9493	505	or die "Error writing to git-commit-tree: $!\n";
2a3e1a85 MU	506	$pw->close();
2a3e1a85 MU	507
a57a9493	508	print "Committed patch $patchset ($branch)\n" if $opt_v;
2a3e1a85	509	chomp(my $cid = <$pr>);
a57a9493 MU	510	length($cid) == 40
	511	or die "Cannot get commit id ($cid): $!\n";
	512	print "Commit ID $cid\n" if $opt_v;
2a3e1a85 MU	513	$pr->close();
	514
	515	waitpid($pid,0);
	516	die "Error running git-commit-tree: $?\n" if $?;
a57a9493 MU	517
	518	open(C,">$git_dir/refs/heads/$branch")
	519	or die "Cannot open branch $branch for update: $!\n";
	520	print C "$cid\n"
	521	or die "Cannot write branch $branch for update: $!\n";
	522	close(C)
	523	or die "Cannot write branch $branch for update: $!\n";
	524
	525	if($tag) {
	526	open(C,">$git_dir/refs/tags/$tag")
	527	or die "Cannot create tag $tag: $!\n";
	528	print C "$cid\n"
	529	or die "Cannot write tag $branch: $!\n";
	530	close(C)
	531	or die "Cannot write tag $branch: $!\n";
	532	print "Created tag '$tag' on '$branch'\n" if $opt_v;
	533	}
a57a9493 MU	534	};
	535
	536	while(<CVS>) {
	537	chomp;
	538	if($state == 0 and /^-+$/) {
	539	$state = 1;
	540	} elsif($state == 0) {
	541	$state = 1;
	542	redo;
	543	} elsif(($state==0 or $state==1) and s/^PatchSet\s+//) {
	544	$patchset = 0+$_;
	545	$state=2;
	546	} elsif($state == 2 and s/^Date:\s+//) {
	547	$date = pdate($_);
	548	unless($date) {
	549	print STDERR "Could not parse date: $_\n";
	550	$state=0;
	551	next;
	552	}
	553	$state=3;
	554	} elsif($state == 3 and s/^Author:\s+//) {
	555	s/\s+$//;
	556	$author = $_;
	557	$state = 4;
	558	} elsif($state == 4 and s/^Branch:\s+//) {
	559	s/\s+$//;
	560	$branch = $_;
	561	$state = 5;
	562	} elsif($state == 5 and s/^Ancestor branch:\s+//) {
	563	s/\s+$//;
	564	$ancestor = $_;
0fa2824f	565	$ancestor = $opt_o if $ancestor eq "HEAD";
a57a9493 MU	566	$state = 6;
	567	} elsif($state == 5) {
	568	$ancestor = undef;
	569	$state = 6;
	570	redo;
	571	} elsif($state == 6 and s/^Tag:\s+//) {
	572	s/\s+$//;
	573	if($_ eq "(none)") {
	574	$tag = undef;
	575	} else {
	576	$tag = $_;
	577	}
	578	$state = 7;
	579	} elsif($state == 7 and /^Log:/) {
	580	$logmsg = "";
	581	$state = 8;
	582	} elsif($state == 8 and /^Members:/) {
	583	$branch = $opt_o if $branch eq "HEAD";
	584	if(defined $branch_date{$branch} and $branch_date{$branch} >= $date) {
	585	# skip
	586	print "skip patchset $patchset: $date before $branch_date{$branch}\n";
	587	$state = 11;
	588	next;
	589	}
	590	if($ancestor) {
	591	if(-f "$git_dir/refs/heads/$branch") {
	592	print STDERR "Branch $branch already exists!\n";
	593	$state=11;
	594	next;
	595	}
	596	unless(open(H,"$git_dir/refs/heads/$ancestor")) {
	597	print STDERR "Branch $ancestor does not exist!\n";
	598	$state=11;
	599	next;
	600	}
	601	chomp(my $id = <H>);
	602	close(H);
	603	unless(open(H,"> $git_dir/refs/heads/$branch")) {
	604	print STDERR "Could not create branch $branch: $!\n";
	605	$state=11;
	606	next;
	607	}
	608	print H "$id\n"
	609	or die "Could not write branch $branch: $!";
	610	close(H)
	611	or die "Could not write branch $branch: $!";
	612	}
	613	if(($ancestor \|\| $branch) ne $last_branch) {
2a3e1a85	614	print "Switching from $last_branch to $branch\n" if $opt_v;
46541669 MU	615	system("git-read-tree","-m","-u","$last_branch","$branch");
46541669 MU	616	die "read-tree failed: $?\n" if $?;
a57a9493 MU	617	}
	618	if($branch ne $last_branch) {
	619	unlink("$git_dir/HEAD");
	620	symlink("refs/heads/$branch","$git_dir/HEAD");
	621	$last_branch = $branch;
	622	}
	623	$state = 9;
	624	} elsif($state == 8) {
	625	$logmsg .= "$_\n";
2a3e1a85	626	} elsif($state == 9 and /^\s+(\S+):(INITIAL\|\d(?:\.\d+)+)->(\d(?:\.\d+)+)\s*$/) {
a57a9493	627	# VERSION:1.96->1.96.2.1
2a3e1a85	628	my $init = ($2 eq "INITIAL");
a57a9493	629	my $fn = $1;
f65ae603 MU	630	my $rev = $3;
	631	$fn =~ s#^/+##;
	632	my $data = $cvs->file($fn,$rev);
2a3e1a85	633	print "".($init ? "New" : "Update")." $fn: ".length($data)." bytes.\n";
a57a9493 MU	634	mkpath(dirname($fn),$opt_v);
	635	open(F,"> ./$fn")
	636	or die "Cannot create '$fn': $!\n";
	637	print F $data
	638	or die "Cannot write to '$fn': $!\n";
	639	close(F)
	640	or die "Cannot write to '$fn': $!\n";
	641	chmod(pmode($cvs->{'mode'}), $fn);
	642	push(@new,$fn); # may be resurrected!
	643	} elsif($state == 9 and /^\s+(\S+):\d(?:\.\d+)+->(\d(?:\.\d+)+)\(DEAD\)\s*$/) {
f65ae603 MU	644	my $fn = $1;
	645	$fn =~ s#^/+##;
	646	push(@old,$fn);
a57a9493 MU	647	} elsif($state == 9 and /^\s*$/) {
	648	$state = 10;
	649	} elsif(($state == 9 or $state == 10) and /^-+$/) {
	650	&$commit();
	651	$state = 1;
	652	} elsif($state == 11 and /^-+$/) {
	653	$state = 1;
	654	} elsif(/^-+$/) { # end of unknown-line processing
	655	$state = 1;
	656	} elsif($state != 11) { # ignore stuff when skipping
	657	print "* UNKNOWN LINE * $_\n";
	658	}
	659	}
	660	&$commit() if $branch and $state != 11;
d4f8b390	661
46541669 MU	662	# Now switch back to the branch we were in before all of this happened
	663	if($orig_branch) {
	664	print "DONE; switching back to $orig_branch\n" if $opt_v;
	665	} else {
	666	$orig_branch = "master";
	667	print "DONE; creating $orig_branch branch\n" if $opt_v;
	668	system("cp","$git_dir/refs/heads/$opt_o","$git_dir/refs/heads/master")
	669	unless -f "$git_dir/refs/heads/master";
	670	}
	671
	672	system("git-read-tree","-m","-u","$last_branch","$orig_branch");
	673	die "read-tree failed: $?\n" if $?;
	674
	675	unlink("$git_dir/HEAD");
	676	symlink("refs/heads/$orig_branch","$git_dir/HEAD");
	677