Question on searching for and using data inside a structured fact

[Sean]

Hi,

I have been attempting (and failing miserably) at trying to obtain the UUID of a partition mounted in a specific directory from the partitions fact.  I'm using puppet 4.10.8.

As an example, let's say I'm looking for the UUID of /boot on my systems...

$ facter partitions

{"sda1"=>{"size"=>"1048576", "mount"=>"/boot/efi"}, "sda2"=>{"uuid"=>"14528e73-61cc-4503-b24f-47c3b6e2aee2", "size"=>"1048576", "mount"=>"/boot"}, "sda3"=>{"uuid"=>"c0f0fa3e-b389-4814-ae8b-dec3b14816fb", "size"=>"974673920"}}

I can successfully use the filter function to find the sda2 hash in puppet:

$x = $facts['partitions'].filter |$p,$d| { $d['mount' == '/boot' }
$k = keys($x)
$u = $x[k[0]]['uuid']
notify { "$u": }

This produces the desired resulting data, a string with the UUID, but it requires using puppetlabs-stdlib's keys function.  So, is there a way to accomplish this with native puppet alone?

Thanks you kindly.

[R.I.Pienaar]

nothing wrong with keys() but...

function uuid_for_partition($needle) {
$uuid = $facts["partitions"].reduce() |$memo, $partition| {
$partition[1]["mount"] ? {
$needle => $partition[0],
default => $memo
}
}
}

notice(uuid_for_partition("/boot"))

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R.I.Pienaar / www.devco.net / @ripienaar