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annotate modules/stdlib/README_DEVELOPER.markdown @ 335:aa9f570d6a9c

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Switch to PHP 7.4 now that NextCloud has reached v18 7.3 only lasted until December 2020 with active support. 7.4 is good until December 2021 with security until 2022.
author IBBoard <dev@ibboard.co.uk>
date Sun, 22 Mar 2020 19:41:50 +0000
parents 956e484adc12
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1 Puppet Specific Facts
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2 =====================
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3
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4 Facter is meant to stand alone and apart from Puppet. However, Facter often
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5 runs inside Puppet and all custom facts included in the stdlib module will
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6 almost always be evaluated in the context of Puppet and Facter working
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7 together.
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9 Still, we don't want to write custom facts that blow up in the users face if
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10 Puppet is not loaded in memory. This is often the case if the user runs
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11 `facter` without also supplying the `--puppet` flag.
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13 Ah! But Jeff, the custom fact won't be in the `$LOAD_PATH` unless the user
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14 supplies `--facter`! You might say...
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16 Not (always) true I say! If the user happens to have a CWD of
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17 `<modulepath>/stdlib/lib` then the facts will automatically be evaluated and
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18 blow up.
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19
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20 In any event, it's pretty easy to write a fact that has no value if Puppet is
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21 not loaded. Simply do it like this:
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23 Facter.add(:node_vardir) do
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24 setcode do
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25 # This will be nil if Puppet is not available.
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26 Facter::Util::PuppetSettings.with_puppet do
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27 Puppet[:vardir]
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28 end
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29 end
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30 end
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32 The `Facter::Util::PuppetSettings.with_puppet` method accepts a block and
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33 yields to it only if the Puppet library is loaded. If the Puppet library is
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34 not loaded, then the method silently returns `nil` which Facter interprets as
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35 an undefined fact value. The net effect is that the fact won't be set.