custom functions

[Chris Donovan]

Hello,

So I'm working my way through writing custom functions for puppet 2.7.6, and what I think is valid seems not to be, and unfortunately I can't find any additional help in the docs.  I've got a pastebin link (http://pastebin.com/HimPyWHh) that shows my function, site.pp, and the file I'm trying to manipulate with my function.  It's fairly basic as you can tell.

I'm getting the following error from the client: err: Could not retrieve catalog from remote server: Error 400 on SERVER: can't convert nil into String at /etc/puppet/manifests/site.pp:81 on node thing
I've been through the troubleshooting stages, ruby -rpuppet fileModify.rb, irb etc. and those work fine.

If I make a syntax error in the function, puppet quite happily complains about it, so it can certainly read the function file.

any suggestions? questions? help? :)
ohh, and I'm following this guide here: http://docs.puppetlabs.com/guides/custom_functions.html


Chris-

[Gary Larizza]

At first glance (on phone), Check this line: 

1.     file = File.open(file, 'r+')

Don't you want filename as the argument?

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Gary Larizza

Professional Services Engineer

Puppet Labs

[Chris Donovan]

Hi,

Yes, filename is what is supposed to be there. That's not my issue
however though, my issue is that it doesn't load / run properly.

If puppet 2.7.6 still does not run functions on the client then that's
great, and I'll write a provider, and possibly a type.

Chris-

[Gary Larizza]

On Wednesday, April 18, 2012, Chris Donovan wrote:

Hi,

Yes, filename is what is supposed to be there.  That's not my issue
however though, my issue is that it doesn't load / run properly.

If puppet 2.7.6 still does not run functions on the client then that's
great, and I'll write a provider, and possibly a type.

Puppet only executes functions on the master - that's by design. Custom facts are executed in the client. 

You might want to look at the file_line type ( https://github.com/puppetlabs/puppetlabs-stdlib/blob/11156fd29a6ccee64663a5a32cf0b37d1867cfb0/lib/puppet/type/file_line.rb ) or Augeas to modify lines in a file. 

[Chris Donovan]

OK, so now that I understand where the functions run, I'll write a
type / provider.

The reason I need to get something custom run on the client is to
learn how puppet works at that level. Then once I'm happy with the
level of knowledge I will get with customizing puppet, I'll be able to
figure out what to use, and / or what I'll need to write.

With regards to augeas, I think it's horrible and would never use
that. The syntax alone is cringe worthy to me.

On the type that you sent me via the link, where does it actually
write IO to the file to insert / append the line?? Is there some
additional function that the type uses? I'm still reading up on types
right now.

Chris-