Hi,
how can I create a condition based on the presence of a specific puppet
class on the host?
I'm using Foreman, some hosts have myclass_a applied, while others have
myclass_a AND myclass_b.
Resources in myclass_b are applied after resources in myclass_a.
Both classes change a parameter inside a configuration file, using augeas.
But this causes two changes in the file on each puppet run (from state b to
a, and then from state a to b again).
So I'm trying to do something like this, to prevent myclass_a from applying
the modification if also myclass_b is present:
class myname::myclass_a {
if defined("myname::myclass_b") {
$confchanges = [
'set anotherpath_b anothervalue_b', # if class B is
present, I only apply my specific edits
]
}
else {
$confchanges = [
'set anotherpath_b anothervalue_b',
'set mypath myvalue_a', # if class B is absent, I also
apply the conflicting edit
]
}
augeas { 'myconffile_a':
lens => 'Puppet.lns',
incl => '/etc/myconf.conf',
changes => $confchanges,
}
}
class myname::myclass_b {
augeas { 'myconffile_b':
lens => 'Puppet.lns',
incl => '/etc/myconf.conf',
changes => 'set mypath myvalue_b',
}
}
...but this does not work, it never gets to the "else" section. Probably
because the "defined" function is evaluated on the puppet master, where the
class always exists.
I cannot use a condition on the existence of the "myconffile_b" resource,
because this is parse order dependent and would always return false when
evaluated inside myclass_a.
Any suggestions?
I'm looking into alternatives like virtual resources or defined types, but
I cannot see anything better suited at the moment.
Thanks.
Marco
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