Brian Ferris schrieb:
> I have a list of databases and a list of users. I want to to grant
> privileges on each database to each user, for a total of # databases x
> # users. I'd rather not write out the grant snippet for each unique
> combination, but rather define the databases as an array of values
> along with the users as an array of values, and then iterate over
> their cross-product. However, I'm finding this tricky to do in
> Puppet.
>
> The main way to perform iteration in Puppet seems to be the Array as
> $name trick:
>
> file { ['a','b','c']: ... } is expanded to file {'a':..}, file
> {'b': ...}, file {'c': ...}
>
> I'm not sure how I can make this trick worth with a cross-product of
> two arrays. Something like:
>
> define outer_loop($inner_values) {
> inner_loop { $inner_values:
> outer_value => $name
> }
> }
>
> define inner_loop($outer_value) {
> # perform op on ${outer_value} + ${name}
> }
>
> Doesn't work, because the call to inner_loop in each iteration of the
> array results in duplicate definition instantiations. I know I'm not
> supposed to think of definitions as functions, but is there some way
> of getting the desired before I'm looking for?
This is one of the applications of my prefix_with function:
http://github.com/DavidS/puppet-common/blob/de7690c4e76ddd7c1f01d81fe92c75771da47c51/plugins/puppet/parser/functions/prefix_with.rb
>
> define outer_loop($inner_values) {
> inner_loop { prefix_with("${name}/", $inner_values):
> outer_value => $name
> }
> }
>
> define inner_loop($outer_value) {
> # perform op on ${outer_value} + ${name}
> }
>
On the downside, you will have to use something like regsubst(0.24.8+)
or gsub(common module) to get the original value back.
On the upside, this creates unique and more descriptive names.
Regards, DavidS
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