fact truth, string interpolation, and str2bool

[Clay Caviness]

I'm going through our puppet configuration trying to get ready for an eventual upgrade to puppet 4.

One thing I'm curious about, though, is the use of str2bool.

In the introduction to the future parser in the 3.8 documentation (http://docs.puppetlabs.com/puppet/3.8/reference/experiments_future.html#facts-can-have-additional-data-types), the suggestion for having code that works in both puppet 3 and 4 is to:

* Interpolate the fact into a string ("$is_virtual")…

* …then pass the string to the stdlib str2bool function (str2bool("$is_virtual")).

However, I'm not sure why interpolating into a string is necessary? If you pass a bool into str2bool, you get that bool right back out, and my tests (with puppet 3.8 and with and without --parser=future) show that interpolating into a string first isn't necessary.

Is there a subtlety I'm missing?

Thanks

[Trevor Vaughan]

If I'm remembering correctly, str2bool used to fail when passed a Boolean.

Therefore, to be safe in *all* cases, you would want to use the prescribed method.

Trevor

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Trevor Vaughan
Vice President, Onyx Point, Inc
(410) 541-6699

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