--- trunk/vz-clone.pl	2007/10/04 13:19:26	22
+++ trunk/vz-clone.pl	2007/10/04 23:42:24	27
@@ -1,17 +1,57 @@
 #!/usr/bin/perl -w
 
 use strict;
-use Shell qw/rsync vzlist lvcreate mount umount lvremove/;
+use Shell qw/rsync vzlist lvcreate mount umount lvremove which lvdisplay mke2fs vzctl/;
 
 my $vz   = '/vz';
 my $conf = '/etc/vz/conf';
 
 my $snap_size = '100M';
 
-my $VEID = shift @ARGV || die "Usage: $0 VEID\n\n",vzlist;
+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";
 
 die "$VEID config $orig_conf doesn't exist\n" unless -e $orig_conf;
@@ -26,15 +66,26 @@
 	my @v = split(/\s+/,$_);
 	if ( $v[1] =~ m/\Q$vz\E/ ) {
 		$vz_lv = $v[0];
-		warn "found lv $vz_lv for $vz\n";
+		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 -> $to\n";
-	rsync('-ra', "$from/", "$to/" );
+	rsync('-raSHAD', "$from/", "$to/" );
 }
 
 if ( $vz_lv ) {
@@ -42,25 +93,72 @@
 	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" );
 	
-	print "Creating $snap_size snapshot $snap from $vz_lv\n";
+	}
+
+	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" );
 
-	lvcreate( '--size', $snap_size, '--snapshot', '--name', $snap, $vz_lv );
+	test_mkdir( "/tmp/$clone/private" );
+	test_mkdir( "/tmp/$clone/root" );
 
-	my $snap_path = "/tmp/$snap";
-	mkdir $snap_path || die "can't create $snap_path: $!";
+	mount_bind( "/tmp/$clone/private", "$vz/private/$CVEID" );
+	mount_bind( "/tmp/$clone/root", "$vz/root/$CVEID" );
 
-	print "Mounting $vz_lv_path/$snap to $snap_path\n";
+	if ( $use_snapshot ) {
 
-	mount( "$vz_lv_path/$snap", $snap_path, '-o', 'noatime' );
+		copy_files( "/tmp/$snap/private/$VEID", "$vz/private/$CVEID" );
 
-	copy_files( "$snap_path/private/$VEID", "$vz/private/$CVEID" );
+		print "Cleanup\n";
 
-	print "Umount $snap_path and remove $vz_lv_path/$snap\n";
+		#umount( "$vz_lv_path/$clone" );
+		umount( "$vz_lv_path/$snap" );
 
-	umount( $snap_path );
+		lvremove( '-f', "$vz_lv_path/$snap" );
 
-	lvremove( '-f', "$vz_lv_path/$snap" );
+	} else {
+		copy_files( "$vz/private/$VEID", "$vz/private/$CVEID" );
+
+	}
 
 } else {