John,
Thanks for the assist. I guess I was working from a less than stellar
example.
On Thursday, May 29, 2014 9:53:14 AM UTC-4, jcbollinger wrote:
>
>
>
> On Wednesday, May 28, 2014 9:16:47 AM UTC-5, smalderma wrote:
>>
>> Hi,
>>
>> I'm working on custom fact that uses Facter::Util::Resolution.exec to run
>> a command that returns output I want to parse with regex. If I write up a
>> ruby shell script like:
>>
>> #!/usr/bin/ruby
>>
>> out = `<command>`
>> out = out.gsub!(/<regex>/, "\\1\\3")
>> puts "#{out}"
>>
>> The desired output comes to the screen, every time, and on every system I
>> run it.
>>
>> If I modify the script to be a fact like so:
>>
>> # custom fact
>> require 'facter'
>> Facter.add(:newfact) do
>> out = Facter::Util::Resolution.exec("<command>")
>> out = out.gsub!(/<regex>/, "\\1\\3")
>> secode { out }
>> end
>>
>> A puppet run actually prints the full output of the command twice after
>> syncing the fact. Running facter -p newfact does the same. On top, the
>> printed output is the raw output not the regex filtered.
>>
>> What am I doing wrong here?
>>
>>
>
> For one thing, you are performing your fact evaluation outside the setcode
> {} block. The part in the block passed to Facter.add() but outside setcode
> {} runs when the fact is added to Facter, but the part inside the setcode
> {} block is run when the fact is evaluated. I speculate that you are
> getting output both times.
>
> There are very few statements that should ever appear in that middle
> area. The one that comes first to mind is 'confine', and others would be
> similar Facter-specific things.
>
> Your fact should look more like this:
>
> require 'facter'
> Facter.add(:newfact) do
> setcode {
> out = Facter::Util::Resolution.exec('<command>')
>
> # F::U::R::exec() may return nil
> out or out.gsub(/<regex>/, "\\1\\3")
> }
> end
>
>
> Note that whatever value is returned by the setcode {} block is taken as
> the value of the fact. There is no particular advantage to assigning it to
> a variable first, though it is harmless to do so.
>
>
> John
>
>
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