[Puppet Users] problems with exported exec resources

I've got an exported exec that looks like:

38 @@exec { "commvault_subclient_$hostname":
39 command => "/usr/local/sbin/commvault_auto_subclient
--touchstamp /srv/mnt/.$hostname_commvault_backed_up $hostname",
40 creates => "/srv/mnt/.$hostname_commvault_backed_up",
41 tag => "commvault_nfs_subclient"
42 }

Elsewhere I've got some manifest to collect these:

90 # Collect the exec's that automatically setup commvault backups
91 Exec <<| tag == 'commvault_nfs_subclient' |>>
92


But on the host that has that collection, I'm not seeing the resulting
script run (which creates the file mentioned as the --touchstamp
argument). It's like the collection is silently failing.

I'm not sure how to debug this. Other exported resources are working,
I'm successfully doing:
@@nagios_host { $hostname:
address => $ipaddress,
use => 'linux-host',
alias => $hostname,
}
@@nagios_service { "$hostname-ping":
use => 'alive-service',
host_name => $hostname,
}

And collecting them with:
Nagios_service <<| |>>
Nagios_host <<| |>>

I'm also seeing in my mysql database entries in the 'resources' table
that have restype='Exec' and have a title like commvault_subclient_webapp01.

I'm running puppet 2.6.2 on the master and the involved clients. Any
suggestions?

Cheers,
Geoff Crompton