On Wednesday, November 1, 2017 at 6:07:49 AM UTC-5, Martijn wrote: > > Well, if you do $disks = facts['os']['disks'] (note: facts, not facter), > you'll have a hash of all disks in $disks. Some of the functions in > puppetlabs-stdlib let you modify hashes. Take a look at delete > <https://forge.puppet.com/puppetlabs/stdlib#delete> to drop keys like > 'fd0' and 'sda' from the hash, then you can use the remaining hash as input > for the LVM module. > > I have always thought that the stdlib docs are a bit colloquial and imprecise where they describe functions that supposedly modify an array or hash. What they actually do, I think, is create a *new* array or hash whose contents match the original, except for the specified modifications. This is the same distinction as between Ruby's Array.reject! and Array.reject, and although it's a bit subtle, it makes a tremendous difference. It therefore behooves us to be as clear as possible.
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