On Fri, Oct 26, 2012 at 06:55:32AM -0700, Dave Mankoff wrote:
> Howdy. I feel like I am missing something really simply with regards to the
> way that Puppet works and I am wondering if someone can point me in the
> write direction.
>
> I have written a class that downloads, uncompresses, compiles, and installs
> Python from source. So far so good. The problem is that it only needs to do
> this once, when Python is not already in place (or some other custom
> indicator of the Python version). I have my 3 calls to exec doing their
> checks just fine, but my calls to wget::fetch and archive::untar both fire
> during every apply. Specifically, archive::untar takes about 30 seconds to
> run and I'd prefer it if it only ran conditionally.
>
> What is the best way to make sure that this code:
>
> wget::fetch { "python-${version}":
> source =>
> "http://python.org/ftp/python/${version}/Python-${version}.tgz";,
> destination => "/tmp/Python-${version}.tgz",
> }
>
> archive::untar {"/tmp/python-${version}":
> source => "/tmp/Python-${version}.tgz",
> compression => 'gz',
> rootdir => "Python-${version}",
> require => Wget::Fetch["python-${version}"],
> }
>
> only runs when some condition is met? I can easily put a custom file in
> place to look for, but how do I make these commands dependent on its
> absence? I tried making such a file and subscribing to it, but these
> commands still ran each time.
>
You don't tell us how wget::fetch is implemented so I can only guess
that there is an exec resource in there? The wget::fetch resource is
*always* evaluated so you have to make sure that the exec resource inside
does not do anything (the exec resource has a `creates` parameter you
can point to a file. If this file is present the command specified by
the `command´ parameter will not run).
Is there a reason why you do not install python as a package or build a
package your own?
-Stefan
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