Puppet users - Aug 2012 - Accessing a fileserver file from a custom function

Hi

I''m struggling with a relatively straightforward custom function.  All
it
is designed to do is check for the existence of a file (on the 
puppetmaster).  It works fine when I specify the full path to the file, but 
I would like to refer to a file in the module''s files directory (e.g. 
"puppet:///modules/apache/local-modules").

How could I acheive this please?  I''d rather not hard-code the full
path as
this would be brittle - how can I "resolve" the puppet:/// url to the 
actual file location please?

(btw I need the function in order to execute classes/ types conditionally 
depending ont he presence of files - it''s for a defined type).

Thanks, James.

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Hi James,

[...]
> How could I acheive this please?  I''d rather not hard-code the
full path as this would be brittle - how can I "resolve" the
puppet:/// url to the actual file location please?
Using "puppet:///" and "file:///" in a way similar to what
the File type offers from within a custom function is actually not that
straight-forward, sadly. There is a lot of code which deals with resolving these
URLs that deals with SSL certificates (since you can request an artifact from
different Puppet Master), etc. I found it not that easy to work with outside of
the File type, but perhaps somebody was more successful than I was (?) :-)

KW

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On Tue, Aug 7, 2012 at 11:13 AM, Krzysztof Wilczynski
<krzysztof.wilczynski@linux.com> wrote:
> Hi James,
>
> [...]
>> How could I acheive this please?  I''d rather not hard-code the
full path as this would be brittle - how can I "resolve" the
puppet:/// url to the actual file location please?
>
> Using "puppet:///" and "file:///" in a way similar to
what the File type offers from within a custom function is actually not that
straight-forward, sadly. There is a lot of code which deals with resolving these
URLs that deals with SSL certificates (since you can request an artifact from
different Puppet Master), etc. I found it not that easy to work with outside of
the File type, but perhaps somebody was more successful than I was (?) :-)
Here''s a function that loads a files in puppet module path which you
can alter to suit your needs:
https://gist.github.com/3289446

This uses the same path as templates so instead of puppet:///, just
module_file(module_name/file_name), and you can look at the template
function for some ideas as well.

Nan

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Fantastic thank you Nan, I''ll give this a try tonight.  It should be
easy
to modify yours to do what I need, thank you for sharing it :)

On Tuesday, August 7, 2012 10:52:42 PM UTC+1, Nan Liu
wrote:
>
> On Tue, Aug 7, 2012 at 11:13 AM, Krzysztof Wilczynski 
> <krzysztof....@linux.com <javascript:>> wrote: 
> > Hi James, 
> > 
> > [...] 
> >> How could I acheive this please?  I''d rather not
hard-code the full
> path as this would be brittle - how can I "resolve" the
puppet:/// url to
> the actual file location please? 
> > 
> > Using "puppet:///" and "file:///" in a way similar
to what the File type
> offers from within a custom function is actually not that straight-forward,
> sadly. There is a lot of code which deals with resolving these URLs that 
> deals with SSL certificates (since you can request an artifact from 
> different Puppet Master), etc. I found it not that easy to work with 
> outside of the File type, but perhaps somebody was more successful than I 
> was (?) :-) 
>
> Here''s a function that loads a files in puppet module path which
you
> can alter to suit your needs: 
> https://gist.github.com/3289446 
>
> This uses the same path as templates so instead of puppet:///, just 
> module_file(module_name/file_name), and you can look at the template 
> function for some ideas as well. 
>
> Nan 
>
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I only just noticed this, but I was actually modifying your gist KW to add 
the puppet:/// parsing.  I''ve forked it but can''t see how to
create a
pull-request for it (I''m fairly new to gihub I''m afraid).

Anyway, for anyone else wanting the function I''ve posted it here: 
https://gist.github.com/3307835.

The next limitation is that it doesn''t resolve template paths.  That
should
probably be in a separate function anyway.

Thank you both for your help.

James.

On Monday, August 6, 2012 10:22:51 AM UTC+1, j4m3s
wrote:
>
> Hi
>
> I''m struggling with a relatively straightforward custom function. 
All it
> is designed to do is check for the existence of a file (on the 
> puppetmaster).  It works fine when I specify the full path to the file, but
> I would like to refer to a file in the module''s files directory
(e.g.
> "puppet:///modules/apache/local-modules").
>
> How could I acheive this please?  I''d rather not hard-code the
full path
> as this would be brittle - how can I "resolve" the puppet:/// url
to the
> actual file location please?
>
> (btw I need the function in order to execute classes/ types conditionally 
> depending ont he presence of files - it''s for a defined type).
>
> Thanks, James.
>
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On Thu, Aug 9, 2012 at 1:45 PM, j4m3s <mrfellows@gmail.com>
wrote:
> I only just noticed this, but I was actually modifying your gist KW to add
> the puppet:/// parsing.  I''ve forked it but can''t see how
to create a
> pull-request for it (I''m fairly new to gihub I''m afraid).
>
> Anyway, for anyone else wanting the function I''ve posted it here:
> https://gist.github.com/3307835.
>
> The next limitation is that it doesn''t resolve template paths. 
That should
> probably be in a separate function anyway.
I just notice Dan contributed something very similar that''s much more
generic to stdlib:

https://github.com/puppetlabs/puppetlabs-stdlib/blob/master/lib/puppet/parser/functions/get_module_path.rb

Thanks,

Nan

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This seems to use the same Puppet::Module.find function that yours did - 
the only difference I can see is that he gets the environment using 

 compiler.environment.to_s

instead of 
Puppet[:environment]

 - is that the improved generic part you''re referring to?

On Thursday, August 9, 2012 9:50:50 PM UTC+1, Nan Liu
wrote:
>
> On Thu, Aug 9, 2012 at 1:45 PM, j4m3s <mrfe...@gmail.com
<javascript:>>
> wrote: 
> > I only just noticed this, but I was actually modifying your gist KW to
> add 
> > the puppet:/// parsing.  I''ve forked it but can''t
see how to create a
> > pull-request for it (I''m fairly new to gihub I''m
afraid).
> > 
> > Anyway, for anyone else wanting the function I''ve posted it
here:
> > https://gist.github.com/3307835. 
> > 
> > The next limitation is that it doesn''t resolve template
paths.  That
> should 
> > probably be in a separate function anyway. 
>
> I just notice Dan contributed something very similar that''s much
more
> generic to stdlib: 
>
>
>
https://github.com/puppetlabs/puppetlabs-stdlib/blob/master/lib/puppet/parser/functions/get_module_path.rb
>
> Thanks, 
>
> Nan 
>
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