On Fri, Aug 10, 2012 at 05:10:20PM -0700, Douglas Garstang wrote:
> How can I pass an array to a define? It's not documented in the puppet
> language guide.
>
> I've got:
>
> define lvm::create_vg ( $pvdisks ) {
> exec {
> 'pvcreate':
> command => "/sbin/pvcreate -yf $pvdisks",
> unless => "/sbin/pvdisplay $pvdisks",
> ...
> }
> }
>
> class someclass {
> lvm::create_vg {
> 'bcvg01':
> pvdisks => ['/dev/xvdb1', '/dev/xvdc1'];
> }
> }
>
> Inside the define, $pvdisks gets expanded to '/dev/xvdb1/dev/xvdc1'
>
> Doug.
Inside your define $pvdisks is whatever you passed as the pvdisks
parameter, so in your case $pvdisks *is* an array. But in the unless
parameter you use the array in a string context so all your items are
concatenated. Unfortunately puppet does not have a join function to
convert an array to a string.
On the other hand it may not be desired to destroy every disk you pass
as in the pvdisks array if only one of the disks is not a LVM disk (as
pvdisplay returns with a non-zero exitcode as soon as one disk is not
recognized to be a LVM disk)
So the best approach is probably to get the LVM puppet plugin and
replace your exec with
physical_volume { $pvdisks:
ensure => present,
}
The physical_volume is a new type that comes with the LVM plugin.
[1] http://forge.puppetlabs.com/puppetlabs/lvm
-Stefan
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