On Thu, 15 Feb 2018, at 11:41, buoyant_puppy wrote:
> I think I got this. My main issue was the 'true' logic with an 'onlyif',
> because that's always only going to either run (= and therefore meet the
> requirement) or not run at all (= which also meets the requirement since
> it's not a failure).
>
> I feel the choice of words here leaves room for confusion. Like "unless"...
> unless succeeds? unless fails? "requires" also leaves some amgiuity as
"unless this thing is true" seems clear to me, also in line with how ruby works
and also puppet
if $thing { }
unless $thing { }
> well, since it considers the requirement met as long as the required
> resource did not explicitly return a failure. So "notrun" is just as good
> as success, which to me doesn't really intuitively match what I think
> "require" means.
require means the required resource is in the desired start. Your desired
state is not to run at certain times, the desired behavior was reached so the
resource is in pass state. require is a generic meta param that applies to all
resources - it does not know the particulars of what you think a certain
resource is doing, its at a higher level.
>
> Here's a set of tests that illustrate all this more clearly, in case it
> helps someone else that stumbles on this post:
> exec { "test1": command => "/bin/false", unless => "/bin/true" } #
> unless = only if this fails
> notify { "false, unless true fails, which it wont: this should not fail
> (notrun) and i should see this": require => Exec["test1"] }
> exec { "test2": command => "/bin/false", onlyif => "/bin/true" } #
> onlyif = only if this returns true
> notify { "false, but only if true: this should fail and i should not see
> this": require => Exec["test2"] }
> exec { "test3": command => "/bin/true", unless => "/bin/true" } # unless
> = only if this fails
> notify { "true, unless true fails, which it wont: this should not run
> true (notrun) and i should see this": require => Exec["test3"] }
> exec { "test4": command => "/bin/true", onlyif => "/bin/false" } # onlyif
> = only if this returns true
> notify { "true, but only if false returns true, which it wont: true will
> be run and i should see this": require => Exec["test4"] }
>
>
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