Using undef in a class declaration... appears to be the subject of a bunch of documents I am ill-qualified to interpret.
https://docs.puppetlabs.com/puppet/latest/reference/lang_data_undef.html "Puppet’s special undef value is roughly equivalent to nil in Ruby; it represents the absence of a value", implying that using undef in a class parameter is like not having that class parameter in the first place. I thought of hiera because when hiera returns nil it is interpreted as "value not present" per that thread. https://docs.puppetlabs.com/puppet/latest/reference/lang_classes.html#overriding-resource-attributes https://projects.puppetlabs.com/issues/16221 So yes, absolutely doesn't work. On Tue, Oct 27, 2015 at 12:07:26PM +0100, DEGREMONT Aurelien wrote: > Le 27/10/2015 11:12, Christopher Wood a écrit : > >Unless there have been any developments of which I am unaware, you would > >need to handle this in the code+hiera. Here's where I dribbled all over this > >thing a few months ago: > > > >https://groups.google.com/forum/#!msg/puppet-users/0l3m4VCHjOg/KKlz5LNpCgYJ > > I think it is different. In my example, there is no hiera involved. > My problem is : > I want my class param value to be 'undef', and not it being 'use the default > value' > > There is no way to set a class param value to undef if there is default > value for it different from undef. > > Thanks anyway > > > > >On Tue, Oct 27, 2015 at 10:03:19AM +0100, DEGREMONT Aurelien wrote: > >>Hello > >> > >>When using class parameters I often face the same issue regarding undef > >>usage. > >>Let's say I got this simple class: > >> > >>class foo ( > >> $service_ensure = 'running', > >>) { > >> service { 'foo': > >> ensure => $service_ensure; > >> } > >>} > >> > >> > >>include foo # will set the service running > >> > >> > >>class { 'foo': > >> service_ensure => 'stopped'; # will set the service stopped > >>} > >> > >> > >>And now, I would like to say 'do not care about ensure'. Do not touch it. > >>For that, I need that ensure is set to 'undef' > >> > >>But I cannot use: > >> > >>class { 'foo': > >> service_ensure => undef; > >>} > >> > >>because in this case, Puppet will use the default value of the parameter, in > >>this case: running. > >> > >>I have this problem for a lot of different modules and I looking for a > >>simple way to do this. > >>I would like to avoid adding an if/else in all my classes. > >> > >> > >>Thanks in advance > >> > >>Aurélien > >> > >>-- > >>You received this message because you are subscribed to the Google Groups > >>"Puppet Users" group. > >>To unsubscribe from this group and stop receiving emails from it, send an > >>email to puppet-users+unsubscr...@googlegroups.com. > >>To view this discussion on the web visit > >>https://groups.google.com/d/msgid/puppet-users/562F3DD7.8010008%40cea.fr. > >>For more options, visit https://groups.google.com/d/optout. > > -- > You received this message because you are subscribed to the Google Groups > "Puppet Users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to puppet-users+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/puppet-users/562F5AEE.8040007%40cea.fr. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "Puppet Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to puppet-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/puppet-users/20151027131434.GA19540%40iniquitous.heresiarch.ca. For more options, visit https://groups.google.com/d/optout.
