> -----Original Message----- > From: puppet-users@googlegroups.com [mailto:puppet- > us...@googlegroups.com] On Behalf Of Daniel Pittman > Sent: Wednesday, June 02, 2010 1:36 AM > To: puppet-users@googlegroups.com > Subject: Re: [Puppet Users] do X if package Y is installed? > > Bill Weiss <bwe...@backstopsolutions.com> writes: > > > Sorry if this is a FAQ that I’ve missed. A pointer to TFM would be > > appreciated if so. > > > > I’m looking for a conditional include of sorts. In module X, I’d > like to > > frob a file if the httpd package is installed. If it’s not, I want > to just > > skip it. Is there a simple way to do this? > > Other people pointed you to writing a custom fact. Let me instead tell > you > why this isn't the best strategy, and suggest another approach that > might work > better in the long run: > > Generally speaking, the more decisions you make in your code the harder > it is > to understand. For example, module foo might do something or might not > based > on module bar being included — in this case, module bar is the HTTPD > package > being installed. > > > A better approach, and one that is simpler, is to specify policy: > > Any host that needs a web server has httpd installed and this file > frobbed. > > Any host that doesn't need a web server does not have httpd > installed. > > Then, code that up in your manifests without the decision: > > In X, install httpd[1] and frob the file. In Y, don't do either. > > Daniel > > Footnotes: > [1] Probably best done by include a httpd class rather than directly > writing > out the 'package' stanza, so other modules can also add the httpd > service.
Sorry for raising my thread from the past here. My problem is, in this case, there are machines that need X but not Y, Y but not X, X and Y, or neither. I can obviously write all of those cases out separately, but that means duplication of code for setting up the parts of X and Y that aren't dependant. Custom facts are probably the best way for me to do this, but I'd love to hear that there's a simpler way. -- You received this message because you are subscribed to the Google Groups "Puppet Users" group. To post to this group, send email to puppet-us...@googlegroups.com. To unsubscribe from this group, send email to puppet-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/puppet-users?hl=en.
