Added the 'packages' disco ball that installs and removes packages for you from parameters. Minor fixups to disco-fs-diff. Fixed a bug in disco-ball where files would not get deleted, and .unionfs was rsynced back into /.

balls/packages/scripts/00-installpkgs.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+#########################
+#
+# 00-installpkgs.sh
+#
+# For each package listed under $(hostname)/packages/[present|absent], 
+# install/remove the package there using the package management 
+# commands under $(hostname)/packages/commands/[present|absent].
+#########################
+
+HOSTNAME=$(hostname)
+RETVAL=0
+
+for op in present absent
+do
+    PKGCMD=$(disco-param get ${HOSTNAME}/packages/commands/${op})
+    for pkgname in $(disco-param keys ${HOSTNAME}/packages/${op})
+    do
+	$PKGCMD $pkgname
+	RETVAL=$(expr $RETVAL + $?)
+    done
+done
+
+exit $RETVAL