Grokbase › Groups › Puppet › puppet-users › July 2012
FAQ
Is it possible to access @resource variables inside a type?

I would like to make some decisions on parameters based on other parameters
that may have already been set.

For example,
---
newparam(:param1) do
Puppet.debug "Found drivesperarray parameter"
desc "parameter 1"
validate do |value|
if resource[:otherparam] then
#dosomething
else
resource[:param1] = 0
end
end
Puppet.debug "Parameter 1 is: #{@resource[:param1]}"
end
---

But I keep getting messages like "undefined method `[]' for nil:NilClass"

Anyone have experience with this? I've tried searching around for example
without much luck...

Thanks!

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  • ZJE at Jul 31, 2012 at 9:20 pm ⇧

    On Tuesday, July 31, 2012 4:05:28 PM UTC-5, ZJE wrote:
    Is it possible to access @resource variables inside a type?

    I would like to make some decisions on parameters based on other
    parameters that may have already been set.

    For example,
    ---
    newparam(:param1) do
    Puppet.debug "Found drivesperarray parameter"
    desc "parameter 1"
    validate do |value|
    if resource[:otherparam] then
    #dosomething
    else
    resource[:param1] = 0
    end
    end
    Puppet.debug "Parameter 1 is: #{@resource[:param1]}"
    end
    ---

    But I keep getting messages like "undefined method `[]' for nil:NilClass"

    Anyone have experience with this? I've tried searching around for example
    without much luck...

    Thanks!

    Actually, it turns out that setting "resource[:param1] = 0" invokes the
    validate loop and the whole thing blows up eventually throws "stack level
    too deep" (glad that it didn't let it keep going)

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  • Nick Lewis at Jul 31, 2012 at 11:54 pm ⇧

    On Tuesday, July 31, 2012 2:05:28 PM UTC-7, ZJE wrote:
    Is it possible to access @resource variables inside a type?

    I would like to make some decisions on parameters based on other
    parameters that may have already been set.

    For example,
    ---
    newparam(:param1) do
    Puppet.debug "Found drivesperarray parameter"
    desc "parameter 1"
    validate do |value|
    if resource[:otherparam] then
    #dosomething
    else
    resource[:param1] = 0
    end
    end
    Puppet.debug "Parameter 1 is: #{@resource[:param1]}"
    end
    ---

    But I keep getting messages like "undefined method `[]' for nil:NilClass"

    Anyone have experience with this? I've tried searching around for example
    without much luck...
    It sounds like what you actually want is a munge block, which is used to
    change the value of the parameter.

    munge do |value|
    if resource[:otherparam] then
    #dosomething
    else

    end
    end

    validate should be used only to raise an exception if the value is invalid.
    Puppet will call validate and then munge. Also, parameters are set in the
    order they're defined in the type/<type>.rb file, and validated/munged
    before moving on to the next parameter. So a parameter can only depend on
    the values of parameters that come *before* it.

    Thanks!
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  • ZJE at Aug 1, 2012 at 12:46 pm ⇧

    On Tuesday, July 31, 2012 6:54:14 PM UTC-5, Nick Lewis wrote:
    On Tuesday, July 31, 2012 2:05:28 PM UTC-7, ZJE wrote:

    Is it possible to access @resource variables inside a type?

    I would like to make some decisions on parameters based on other
    parameters that may have already been set.

    For example,
    ---
    newparam(:param1) do
    Puppet.debug "Found drivesperarray parameter"
    desc "parameter 1"
    validate do |value|
    if resource[:otherparam] then
    #dosomething
    else
    resource[:param1] = 0
    end
    end
    Puppet.debug "Parameter 1 is: #{@resource[:param1]}"
    end
    ---

    But I keep getting messages like "undefined method `[]' for nil:NilClass"

    Anyone have experience with this? I've tried searching around for example
    without much luck...
    It sounds like what you actually want is a munge block, which is used to
    change the value of the parameter.

    munge do |value|
    if resource[:otherparam] then
    #dosomething
    else

    end
    end

    validate should be used only to raise an exception if the value is
    invalid. Puppet will call validate and then munge. Also, parameters are set
    in the order they're defined in the type/<type>.rb file, and
    validated/munged before moving on to the next parameter. So a parameter can
    only depend on the values of parameters that come *before* it.

    Thanks!
    Hi Nick,

    You're exactly right - even though I had read about munge, I completely
    forgot it and must've missed it a million times in the documentation.

    Thanks so much!

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postedJul 31, '12 at 9:05p
activeAug 1, '12 at 12:46p
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