On 6/4/18 8:25 AM, Peter Berghold wrote:
I was looking at someone else's code one day last week and saw a pattern
I've not seen before. Maybe that's what I get for developing Puppet code
in a vacuum. :-)
class someclass (
$parm1 = $::someclass::params::parm1,
$parm2 = $::someclass::params::parm2 # so far I get it.
) inherits someclass::params { # ok, I get it
class{'someclass::package': } # OK
-> class('someclass::configure':} # right...
-> Class{'someclass':} # HUH? What does that do?
}
Is that last step necessary and why?
The last step was fairly common in Puppet 2.7 code before Anchors. It is
necessary if you want to do something like this.
class profile::mystack {
include ::otherclass
include ::someclass
Class['someclass'] -> Class['otherclass']
}
By adding that -> Class{'someclass':} to the end you create a chain that
requires all classes to completed before 'someclass' is completed.
Allows you to do the ordering I've shown.
In Puppet 3.4 the keyword 'contain' was introduced. The modern
implementation might look like
class someclass (
$parm1 = $::someclass::params::parm1,
$parm2 = $::someclass::params::parm2,
) inherits someclass::params {
contain someclass::package
contain someclass::configure
Class['someclass::package']
-> Class['someclass::configure']
}
fwiw a lot of my modules internally will mix and match include with
contain. In the case below I do not want containment around the yum repo
because in our system that's guaranteed to cause dependency cycles. Also
service usually encapsulate some systemd reloading which can cause the
same problem. Containing install and config is usually enough to allow
other modules to depend on my somedaemon module though not always.
class somedaemon {
include ::somedaemon::repo
contain ::somedaemon::install
contain ::somedaemon::config
include ::somedaemon::service
Class['::yum']
-> class['::somedaemon::install']
-> Class['::somedaemon::config']
~> Class['::somedaemon::service']
}
Ramin
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