My external node classifier returns some arrays in the list of
parameters. Example output (names have been changed to protect the
innocent):
$ ./node_classifier a.b.com
--- %YAML:1.0
"classes": ["class1", "class2",
"class3"]
"parameters":
"hostname": "a"
"name": "a"
"domain": "b.com"
"fqdn": "a.b.com"
"group": "<host group>"
"clusters": ["cluster1", "cluster2",
"cluster3", "cluster4"]
In my puppet manifests, I would like to be able to use the elements in
the clusters array to generate multiple files to use for the source
parameter of the file type. For example, given the above YML, I''d like
the end result of the file parameter to behave like this:
file { "/etc/somefile.conf":
source => [
"puppet://server/module/configfile.cluster1",
"puppet://server/module/configfile.cluster2",
"puppet://server/module/configfile.cluster3",
"puppet://server/module/configfile.cluster4",
"puppet://server/module/configfile.default"
];
}
However, I can''t figure out how to generate the multiple sources from
the array. This (unsurprisingly) doesn''t work:
file { "/etc/somefile.conf":
source => [
"puppet://server/module/configfile.$clusters"
];
}
Is what I want to do here possible using the native Puppet language?
Will I need to write a custom function to generate the source files
myself, then pass them to the file type? Is there some other step that
I''m just missing?
Thanks in advance for any help. Getting this to work will save me a
whole lot of time.
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I guess one way would be to write a small custom function which gets an
array as an argument and returns an array of sources.
(didnt test :))
module Puppet::Parser::Functions
newfunction(:array2source, :type => :rvalue) do |args|
if args[0].is_a?(Array)
sources = Array.new
args[0].each {|s| source <<
"puppet://server/module/configfile.#{s}"}
end
sources << "puppet://server/module/configfile.default"
return sources
end
end
and then in your manifest just do:
file { "/etc/somefile.conf":
source => array2source(clusters)
}
cheers,
Ohad
On Sun, Feb 1, 2009 at 10:25 AM, threetee <threetee@gmail.com> wrote:
>
> My external node classifier returns some arrays in the list of
> parameters. Example output (names have been changed to protect the
> innocent):
>
> $ ./node_classifier a.b.com
> --- %YAML:1.0
> "classes": ["class1", "class2",
"class3"]
> "parameters":
> "hostname": "a"
> "name": "a"
> "domain": "b.com"
> "fqdn": "a.b.com"
> "group": "<host group>"
> "clusters": ["cluster1", "cluster2",
"cluster3", "cluster4"]
>
> In my puppet manifests, I would like to be able to use the elements in
> the clusters array to generate multiple files to use for the source
> parameter of the file type. For example, given the above YML, I''d
like
> the end result of the file parameter to behave like this:
>
> file { "/etc/somefile.conf":
> source => [
> "puppet://server/module/configfile.cluster1",
> "puppet://server/module/configfile.cluster2",
> "puppet://server/module/configfile.cluster3",
> "puppet://server/module/configfile.cluster4",
> "puppet://server/module/configfile.default"
> ];
> }
>
> However, I can''t figure out how to generate the multiple sources
from
> the array. This (unsurprisingly) doesn''t work:
>
> file { "/etc/somefile.conf":
> source => [
> "puppet://server/module/configfile.$clusters"
> ];
> }
>
> Is what I want to do here possible using the native Puppet language?
> Will I need to write a custom function to generate the source files
> myself, then pass them to the file type? Is there some other step that
> I''m just missing?
>
> Thanks in advance for any help. Getting this to work will save me a
> whole lot of time.
> >
>
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Thanks Ohad, I think that got me headed in the right direction. Here''s
what I came up with for the custom function (I made it more reusable):
---- snip ----
Puppet::Parser::Functions::newfunction(:array_merge, :type
=> :rvalue, :doc => "A function that accepts a normal string
and an array. The function returns an array that contains each of
the input
array''s values, merged with the string. Merging is performed by
replacing
the <VAL> token in the string with the array value. If no <VAL>
token
exists, the array string is appended to the end of the string.")
do |args|
token = ''<VAL>''
inputstring = args[0]
if args[1] then
outputstrings = Array.new
args[1].each do |val|
if inputstring.match(token) then
outputstrings << inputstring.sub(token, val)
else
outputstrings << inputstring.concat(val)
end
end
else
return false
end
return outputstrings
end
---- snip ----
In my manifest, I can do this and it works:
---- snip ----
$clustersources = array_merge("puppet://server/module/
configfile.<VAL>", $clusters)
file { "/etc/somefile.conf":
source => $clustersources;
}
---- snip ----
However, I still haven''t figured out how to tack on the default
configfile ("puppet://server/module/configfile.default") to the array.
I tried this, but it doesn''t work:
file { "/etc/somefile.conf":
source => [
$clustersources,
"puppet://server/module/configfile.default",
};
}
Also in some cases, in addition to the default config file, I''ll also
need some config files to go before the cluster-specific config files
in the array. I tried using the += operator to append data to the
array, but that doesn''t work because everything''s in the same
scope (I
get the error, "Cannot append, variable sources is defined in this
scope").
Am I still going about this the right way? Thanks to all for any help
you can give me.
On Jan 31, 6:50 pm, Ohad Levy <ohadl...@gmail.com>
wrote:> I guess one way would be to write a small custom function which gets an
> array as an argument and returns an array of sources.
>
> (didnt test :))
>
> module Puppet::Parser::Functions
> newfunction(:array2source, :type => :rvalue) do |args|
> if args[0].is_a?(Array)
> sources = Array.new
> args[0].each {|s| source <<
"puppet://server/module/configfile.#{s}"}
> end
> sources << "puppet://server/module/configfile.default"
> return sources
> end
> end
>
> and then in your manifest just do:
>
> file { "/etc/somefile.conf":
> source => array2source(clusters)
>
> }
>
> cheers,
> Ohad
>
> On Sun, Feb 1, 2009 at 10:25 AM, threetee <three...@gmail.com> wrote:
>
> > My external node classifier returns some arrays in the list of
> > parameters. Example output (names have been changed to protect the
> > innocent):
>
> > $ ./node_classifier a.b.com
> > --- %YAML:1.0
> > "classes": ["class1", "class2",
"class3"]
> > "parameters":
> > "hostname": "a"
> > "name": "a"
> > "domain": "b.com"
> > "fqdn": "a.b.com"
> > "group": "<host group>"
> > "clusters": ["cluster1", "cluster2",
"cluster3", "cluster4"]
>
> > In my puppet manifests, I would like to be able to use the elements in
> > the clusters array to generate multiple files to use for the source
> > parameter of the file type. For example, given the above YML,
I''d like
> > the end result of the file parameter to behave like this:
>
> > file { "/etc/somefile.conf":
> > source => [
> > "puppet://server/module/configfile.cluster1",
> > "puppet://server/module/configfile.cluster2",
> > "puppet://server/module/configfile.cluster3",
> > "puppet://server/module/configfile.cluster4",
> > "puppet://server/module/configfile.default"
> > ];
> > }
>
> > However, I can''t figure out how to generate the multiple
sources from
> > the array. This (unsurprisingly) doesn''t work:
>
> > file { "/etc/somefile.conf":
> > source => [
> > "puppet://server/module/configfile.$clusters"
> > ];
> > }
>
> > Is what I want to do here possible using the native Puppet language?
> > Will I need to write a custom function to generate the source files
> > myself, then pass them to the file type? Is there some other step that
> > I''m just missing?
>
> > Thanks in advance for any help. Getting this to work will save me a
> > whole lot of time.
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