Jira (PUP-8593) Add alias to lookup_options and make it redirect to lookup of the alias

[Henrik Lindberg (JIRA)]

Henrik Lindberg created an issue

Puppet / PUP-8593 Add alias to lookup_options and make it redirect to lookup of the alias Issue Type: New Feature Assignee: Unassigned Created: 2018/03/23 3:56 AM Priority: Normal Reporter: Henrik Lindberg The existing hiera interpolation function alias is problematic to use. By adding a key alias in lookup_options for an original-key a lookup should take that alias-key and use it to lookup instead of the given original-key. Details: The implementation must guard against circular aliases There is an option wrt handling of the other lookup_options: Use the options for original-key and ignore those in alias-key ignore the options for original-key and use those for the alias-key merge the options with original-key at higher t If an alias-key is in turn aliased, the process recurses Option 3 allows for just specifying alias and getting the rest of the options from the aliased key. We can also add advanced features: If the alias-key is an array, the entries in that array are used as aliased lookups and the result is an array with those values. If the alias-key is a hash, the keys are used as keys in the resulting hash where values are the looked up keys Add Comment

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[Thomas Hallgren (JIRA)]

Thomas Hallgren commented on PUP-8593

Re: Add alias to lookup_options and make it redirect to lookup of the alias A simpler, and perhaps more straight forward solution that was proposed in PUP-8341, is to introduce an additional interpolation function. This has already been done in the Go version of Hiera. The function is called `strict_alias` and behaves like `alias` with the exception that a not found is propagated instead of translated into an empty string.

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[Henrik Lindberg (JIRA)]

Henrik Lindberg commented on PUP-8593

Re: Add alias to lookup_options and make it redirect to lookup of the alias

Thomas Hallgren That is solving PUP-8341, a completely different problem than this ticket (what is described above would also benefit from having some kind of "strict" option). I think PUP-8341 should be reopened for the purpose of adding strict_alias interpolation function. This ticket is about having a more powerful mechanism for aliasing than what is currently possible with the hiera interpolation functions.

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[Thomas Hallgren (JIRA)]

Thomas Hallgren commented on PUP-8593

Re: Add alias to lookup_options and make it redirect to lookup of the alias

Not sure why that is. The only thing that the current alias doesn't, is to propagate the "not-found" condition. It preserves the type and it guards against recursion. Perhaps I'm missing something but besides the "advanced features" (which I personally think we should avoid), I don't see more value added here.

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[Maggie Dreyer (Jira)]

Maggie Dreyer updated an issue

Puppet / PUP-8593

Add alias to lookup_options and make it redirect to lookup of the alias

Change By: Maggie Dreyer Component/s: Hiera & Lookup

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