--- trunk/vz-clone.pl	2007/10/04 11:30:05	20
+++ trunk/vz-clone.pl	2007/10/05 00:28:43	28
@@ -1,14 +1,56 @@
 #!/usr/bin/perl -w
 
 use strict;
-use Shell qw/rsync vzlist/;
+use Shell qw/rsync vzlist lvcreate mount umount lvremove which lvdisplay mke2fs vzctl/;
 
 my $vz   = '/vz';
 my $conf = '/etc/vz/conf';
 
-my $VEID = shift @ARGV || die "Usage: $0 VEID\n\n",vzlist;
+my $snap_size = '100M';
 
-my $CVEID = "99$VEID";
+my ( $action, $VEID ) = @ARGV;
+
+my $use_snapshot = 0;
+
+my $valid_actions = 'create|umount|destroy';
+
+die "Usage: $0 ($valid_actions) VEID\n\n",vzlist unless $VEID && $action && $action =~ m/($valid_actions)/;
+
+my $CVEID = "10$VEID";
+
+sub vzctl_stop {
+	my $veid = shift;
+	my $vzlist = vzlist();
+	if ( $vzlist =~ m/$veid/ ) {
+		print "stop $veid\n";
+		vzctl('stop', $veid);
+	}
+}
+
+
+if ( $action eq 'create' ) {
+	vzctl_stop( $CVEID );
+} elsif ( $action eq 'destroy' ) {
+	vzctl_stop( $VEID );
+}
+
+
+if ( 1 || $action =~ m/(umount|destroy)/ ) {
+	my $clone;
+	open(my $m, '-|', 'mount') || die "can't open mount: $!";
+	while(<$m>) {
+		my @v = split(/\s+/,$_);
+		if ( $v[2] =~ m!/(private|root)/$VEID$! && $v[5] =~ m/bind/ ) {
+			umount( $v[2] );
+		} elsif ( $v[2] =~ m!vz-clone-$VEID$! ) {
+			$clone = $v[2];
+		}
+	}
+	umount( $clone ) if $clone;
+}
+
+#die "unknown action: $action" unless $action eq 'create';
+exit unless $action eq 'create';
 
 my $orig_conf = "/etc/vz/conf/$VEID.conf";
 
@@ -16,22 +58,138 @@
 
 print "Clone VE $VEID -> $CVEID\n";
 
-rsync('-ra', "$vz/private/$VEID", "$vz/private/$CVEID" );
+my $vz_lv;
+
+open(my $m, '<', '/etc/fstab') || die "can't open /etc/fstab: $!";
+while(<$m>) {
+	next if m/^#/;
+	my @v = split(/\s+/,$_);
+	if ( $v[1] =~ m/\Q$vz\E/ ) {
+		$vz_lv = $v[0];
+		warn "found LV $vz_lv for $vz\n";
+		last;
+	}
+}
+
+sub fs_quota {
+	my $id = shift;
+	open(my $q, '-|', "vzquota -b show $id") || die "can't exec vzquota show $id: $!";
+	my $l = <$q>;
+	$l =~ s/^\s+//;
+	my ( $usage, $soft, $hard ) = split(/\s+/,$l);
+	warn "quota for $id | $soft < $hard | usage: $usage\n";
+	return ( $usage, $soft, $hard ) if wantarray;
+	return $soft;
+}
+
+sub copy_files {
+	my ( $from, $to ) = @_;
+	warn "rsync $from -> $to\n";
+	rsync('-raSHAD', "$from/", "$to/" );
+}
+
+if ( $vz_lv ) {
+
+	my ( $vz_lv_path, $vz_lv_name ) = ( $1, $2 ) if ( $vz_lv =~ m!^(.+)/([^/]+)$! );
+
+	my $snap = $vz_lv_name . '-snap';
+	my $clone = "vz-clone-$CVEID";
+
+	sub do_mount {
+		my ( $from, $to ) = @_;
+		mkdir $to || die "can't create $to: $!";
+		print "Mounting $from to $to\n";
+		mount( $from, $to, '-o', 'noatime' );
+	}
+
+	sub test_mkdir {
+		my $dir = shift;
+		if ( ! -d $dir ) {
+			mkdir $dir || die "can't mkdir $dir: $!";
+		}
+	}
+
+	sub mount_bind {
+		my ( $from, $to ) = @_;
+		die "$from doesn't exist!" unless -d $from;
+		test_mkdir( $to );
+		mount( '--bind', $from, $to );
+	}
+
+	if ( $use_snapshot ) {
+
+		print "Creating $snap_size snapshot $snap from $vz_lv\n";
+		lvcreate( '--size', $snap_size, '--snapshot', '--name', $snap, $vz_lv );
+
+		do_mount( "$vz_lv_path/$snap", "/tmp/$snap" );
+	
+	}
+
+	my $clone_size = fs_quota( $VEID ) . 'k';
+	my $vg_name = $1 if ( $vz_lv_path =~ m!/([^/]+)/*$! );
+
+	if ( lvdisplay( "$vz_lv_path/$clone" ) ) {
+		warn "using existing $vz_lv_path/$clone\n";
+	} else {
+		print "Creating LV $clone ($clone_size bytes) in VG $vg_name for $VEID clone filesystem\n";
+		lvcreate( '--size', $clone_size, '--name', $clone, $vg_name );
+		mke2fs( '-m', 0, '-j', "$vz_lv_path/$clone" );
+	}
+
+	do_mount( "$vz_lv_path/$clone", "/tmp/$clone" );
+
+	test_mkdir( "/tmp/$clone/private" );
+	test_mkdir( "/tmp/$clone/root" );
+
+	mount_bind( "/tmp/$clone/private", "$vz/private/$CVEID" );
+	mount_bind( "/tmp/$clone/root", "$vz/root/$CVEID" );
+
+	if ( $use_snapshot ) {
+
+		copy_files( "/tmp/$snap/private/$VEID", "/tmp/$clone/private" );
+
+		print "Cleanup\n";
+
+		#umount( "$vz_lv_path/$clone" );
+		umount( "$vz_lv_path/$snap" );
+
+		lvremove( '-f', "$vz_lv_path/$snap" );
+
+	} else {
+		copy_files( "$vz/private/$VEID", "/tmp/$clone/private" );
+
+	}
+
+} else {
+
+	copy_files( "$vz/private/$VEID", "$vz/private/$CVEID" );
+}
+
+my $note = "# modified by $0\n";
 
 sub fix_ip {
 	my $ip = shift;
+	$ip =~ s/['"]//g;
 	$ip =~ s/^\d+\./10./;
 	warn "$CVEID new IP number: $ip\n";
-	return qq{IP_ADDRESS=$ip};
+	return $note . qq{IP_ADDRESS="$ip"};
+}
+
+sub fix_hostname {
+	my $hostname = shift;
+	$hostname =~ s/['"]//g;
+	$hostname = "clone-$hostname";
+	warn "$CVEID new hostname: $hostname\n";
+	return $note . qq{HOSTNAME="$hostname"};
 }
 
 open(my $o, '<', "$conf/$VEID.conf")  || die "can't open $conf/$VEID.conf: $!";
 open(my $n, '>', "$conf/$CVEID.conf") || die "can't open $conf/$CVEID.conf: $!";
 while(<$o>) {
-	s!^(HOSTNAME=)(.*)$!$1clone-$2!i;
-	s!^(IP_ADDRESS=.*)$!fix_up($1)!e;
-	s!^(ONBOOT=).*$!# modified by $0\n$1="no"!gi;
+	s!^HOSTNAME=(.*)$!fix_hostname($1)!ie;
+	s!^IP_ADDRESS=(.*)$!fix_ip($1)!ie;
+	s!^(ONBOOT=).*$!# modified by $0\n$1"no"!i;
 	print $n $_;
 }
 
-print "Please edit config $conf/$CVEID.conf before vzctl start $CVEID\n"
+print "\nPlease review config file: $conf/$CVEID.conf\nAdd NAT for new VE with: iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE\nStart clone of $VEID with: vzctl start $CVEID\n"