On 15 May 2013 15:24, jcbollinger <john.bollin...@stjude.org> wrote:

>
>
> On Wednesday, May 15, 2013 6:29:14 AM UTC-5, Dick Davies wrote:
>>
>>
>> At the minute we've set an empty string, but then templates etc. need to
>> be littered with
>>
>> if ($url_from_hiera != "") {
>>   do_stuff()
>> }
>>
>> which feels like the sort of 'magic variable' that will bite future me in
>> the ass in around 6 months.
>>
>>
>
> So, what do you envision hiera returning instead?  undef?  How would that
> make things better for you?  Wouldn't you still need similar conditional
> logic in all the same places?
>
>
I can get a bit closer to the ideal if I set the value as : false
- then the templates look like this (the $yum_proxy_url gets unpacked out
of hiera
up in the module):

<%- if yum_proxy_url != false %>
# use proxy
proxy=<%=yum_proxy_url %>
<% end -%>

which is a bit more readable. Not really clear why the : != false part is
required, but
feels cleaner to me.

And no, annoyingly

proxy=

breaks yum :)


I don't see the magic variable problem in this case, in that the empty
> string is actually a pretty good representation of the meaning you want to
> convey.  You might even find that setting the http_proxy environment
> variable to an empty string has the desired effect (of not trying to use a
> proxy), though that's speculative on my part.  If that did work then the
> empty string wouldn't be magic at all.
>

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