Thanks Jeff,
I copy-pasted the code and it just worked. Here is my function:
require 'uri'
module Puppet::Parser::Functions
newfunction(:loadyaml, :doc => <<-'ENDHEREDOC') do |args|
Load a YAML file containing a hash, set the hash values.
Support puppet urls
For example:
loadyaml('/etc/puppet/data/myhash.yaml')
loadyaml('puppet:///modules/name/myhash.yaml')
ENDHEREDOC
unless args.length == 1
raise Puppet::ParseError, ("loadyaml(): wrong number of
arguments (#{args.length}; must be 1)")
end
params = nil
path = args[0]
unless Puppet::Util.absolute_path?(path)
uri = URI.parse(URI.escape(path))
raise Puppet::ParseError, ("Cannot use relative URLs
'#{path}'") unless uri.absolute?
raise Puppet::ParseError, ("Cannot use opaque URLs
'#{path}'") unless uri.hierarchical?
raise Puppet::ParseError, ("Cannot use URLs of type
'#{uri.scheme}' as source for fileserving") unless
%w{puppet}.include?(uri.scheme)
Puppet.info "loading parameters from #{path}"
content = Puppet::FileServing::Content.indirection.find(path)
params = YAML.load(content.content)
else
params = YAML.load_file(path)
end
params.each do |param, value|
setvar(param, value)
end
end
end
2012/11/14 Jeff McCune <
jeff@puppetlabs.com>:
On Tue, Nov 13, 2012 at 5:25 AM, woosley. xu. wrote:
I am thinking about loading some paramters from a external file for my
souces. Eg,
class test {
## set parameters.
load_from_yaml("puppet:///modules/test/config.yaml")
}
Ah, cool idea. I think this would be a really valuable function to
include in the stdlib [1] module.
While it's very difficult to get the filesystem path, it seems like
you really only need the contents of the file. If you have a
puppet:// URI, you can speak to the Puppet fileserve using the REST
API to get the file contents. This would avoid the need to read the
file from disk yourself and it will work well even in multiple-master
deployment scenarios since you're speaking to the API rather than to
the underlying filesystem.
The static compiler does just this. It reads the contents of the file
using the FileServer API in the store_content method:
https://github.com/puppetlabs/puppet/blob/master/lib/puppet/indirector/catalog/static_compiler.rb#L160-161You might be able to do something similar in your parser function.
Given a URI, pass the string form to
Puppet::FileServing::Content.indirection.find and you should get back
a Ruby instance that models the file metadata and contains the
content.
Hope this helps,
-Jeff
[1]
https://forge.puppetlabs.com/puppetlabs/stdlib--
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