Create a variable out of a bash command and notify it

[Nir Fishler]

Hello,

I'd like to store an output of a bash command into a variable, and then print it to stdout using notify in Puppet.

Main goal: get a list of upgrade-able packages and notify the user about it.

I have tried the below but it doesn't seem to work:

$pkgs_list = $("/usr/bin/apt --simulate upgrade | grep '^Inst' | awk -F ' ' '{print $2}'")

notify { "STDOUT: ${pkgs_list}": }

[Martin Alfke]

Hi Nir,

You want to collect information on nodes and you want to use this information in a catalog.

This is what facter is used for. 

<module>/lib/facter/upgradable_packages.rb

Facter.add(:upgradable_packages) do

  setcode do

    Facter::Core::Execution.execute("/usr/bin/apt --simulate upgrade | grep '^Inst' | awk -F ' ' '{print $2}'")

  end

end

Within your puppet code you can then refer to the fact:

notify { $upgradable_packages: }

Hth,

Martin

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[Dirk Heinrichs]

Am Sonntag, dem 04.12.2022 um 07:43 -0800 schrieb Nir Fishler:

Main goal: get a list of upgrade-able packages and notify the user about it.

The puppetlabs-apt module from the Puppet Forge has various facts for this.

HTH...

Dirk

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Dirk Heinrichs

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[Nir Fishler]

Thanks a lot guys for your prompt reply!

Gonna try it out later on.

[Nir Fishler]

@Martin,

I have tried your approach; I put the facter file underneath:

/opt/puppetlabs/puppet/lib/ruby/vendor_ruby/facter/custom_facts/core/execution/

file:

username.rb

content:

# username.rb

Facter.add(:username) do

  setcode do

    Facter::Core::Execution.execute("/usr/bin/hostname |/usr/bin/awk -F'-' {'print $1'}")

  end

end

But I keep getting an error:

Error: Evaluation Error: Empty string title at 0. Title strings must have a length greater than zero. (line: 1, column: 8) on node puppet-master.domain.com

what am I missing here?

[Dirk Heinrichs]

Am Sonntag, dem 18.12.2022 um 05:10 -0800 schrieb Nir Fishler:

/opt/puppetlabs/puppet/lib/ruby/vendor_ruby/facter/custom_facts/core/execution/

This is the wrong place. Ruby based facts should be put into "lib/facter/" inside a module, see https://puppet.com/docs/puppet/7/custom_facts.html.