Update cluster_cron.pl

cluster_cron.pl

@@ -2,20 +2,41 @@
 use warnings;
 use strict;
 use Sys::Hostname;
+use File::Compare;
+use File::Copy;
 
 # We need a common directory for our nodes to write and read state from plus a couple of cronfiles
-my ($electiondir, $cronfile, $sharedcronfile) = @_;
+my ($mode, $user, $shareddir, $spooldir) = @_;
 
-unless (-d $electiondir) {
-        mkdir $electiondir;
+# Set some defaults if we didn't get them
+unless ($mode) {
+	# mode 0 = active/passive, mode 1 = active/active
+	$mode = 1;
+}
+unless ($user) {
+	$user = "www-data";
+}
+unless ($shareddir) {
+	$shareddir = "/var/lib/thruk";
+}
+unless ($spooldir) { 
+	$spooldir = "/var/spool/cron/crontabs";
 }
 
-# We need our name
+my $sharedcrondir = "$shareddir/crontab";
+my $cronfile = "$spooldir/$user";
+my $sharedcronfile = "$sharedcrondir/$user";
+my $oldsharedcronfile = "$sharedcrondir/$user.old";
+my $electiondir = "$sharedcrondir/election";
 my $hostname = hostname;
-
-# We also need to know the time
 my $time = time;
 
+# Create directories 
+unless (-d $sharedcrondir) {
+	mkdir $sharedcrondir or die "Can not create shared directory: $!";
+}
+
+
 
 # Get the nodes in the cluster
 sub get_nodes {
@@ -118,13 +139,64 @@ sub uncomment {
 
 }
 
-# Update timestamp
-write_timestamp;
+# If we are running in active/active mode
+if($mode) {
+	unless (-d $electiondir) {
+		mkdir $electiondir;
+	}
+
+	# Update timestamp
+	write_timestamp;
 
-# See if I am the one
-if (is_active(get_nodes) ){
+	# See if I am the one
+	if (is_active(get_nodes) ){
 		uncomment $sharedcronfile, $cronfile;
 
-} else {
+	} else {
 		comment_out $cronfile, $sharedcronfile;
+	}
+
 }
+
+# If we are running in actie/passive mode
+else {
+	# If we don't have any cronjob on this host
+	unless (-e $cronfile) {
+		# If we have a cronjob on the shared drive
+		if (-e $sharedcronfile) {
+			copy($sharedcronfile, $cronfile) or die "Copy failed: $!";
+			copy($sharedcronfile, $oldsharedcronfile) or die "Copy failed: $!";
+		} 
+		# Nothing to do, no cronjob on any host
+		exit;
+	} 
+
+	# If there is no cronjob on the shared drive
+	unless (-e $sharedcronfile) {
+		# But we have a cronjob on this host
+		if (-e $cronfile) {
+			copy($cronfile, $sharedcronfile) or die "Copy failed: $!";
+
+		}
+		exit;
+	} 
+
+	# Current cronfile and shared cronfile is not same
+	if(compare($cronfile, $sharedcronfile) != 0) {
+
+		# This means that the other node has changed the cron file
+		if(compare($cronfile, $oldsharedcronfile) == 0) {
+			copy($sharedcronfile, $cronfile) or die "Copy failed: $!";
+			copy($sharedcronfile, $oldsharedcronfile) or die "Copy failed: $!";
+			# All files are now the same
+		# This means that my node has changed the cron file
+		} else {
+			copy($cronfile, $sharedcronfile) or die "Copy failed: $!";
+			# The other node will now detect the difference and do the correct adjustment
+		}
+	}
+
+
+}
+
+exit;