Added a pcs wrapper to serialize pcs constraint calls.

Signed-off-by: digimer <mkelly@alteeve.ca>

Anvil/Tools.pm

@@ -1254,7 +1254,7 @@ sub _set_paths
 				pamscale			=>	"/usr/bin/pamscale",
 				pamtopng			=>	"/usr/bin/pamtopng",
 				passwd				=>	"/usr/bin/passwd",
-				pcs				=>	"/usr/sbin/pcs",
+				pcs				=>	"/usr/sbin/anvil-pcs-wrapper",
 				perccli64			=>	"/opt/MegaRAID/perccli/perccli64",
 				pidof				=>	"/usr/sbin/pidof",
 				ping				=>	"/usr/bin/ping",

tools/Makefile.am

@@ -28,6 +28,7 @@ dist_sbin_SCRIPTS	= \
 			  anvil-migrate-server \
 			  anvil-network-profiler \
 			  anvil-parse-fence-agents \
+			  anvil-pcs-wrapper \
 			  anvil-provision-server \
 			  anvil-rename-server \
 			  anvil-report-usage \

tools/anvil-pcs-wrapper

@@ -0,0 +1,10 @@
+#!/bin/sh -e
+
+(
+	if [ "$1" != "constraint" ]; then
+		pcs $@
+		exit $?
+	fi
+	flock -e 200
+	pcs $@
+) 200>/tmp/pcs.lock