[augeas-devel] adjustment to the krb5.aug lense

[Raphaël Pinson]

Hi Pat,

Sorry for the long delay in replying to you.


On Thu, Apr 19, 2012 at 11:47 PM, Pat Riehecky <riehecky at fnal.gov> wrote:

>
> (Apologies for the return of this old thread, but the history seemed to
> help provide context)
>
> I've almost got this working the way I think it should and reading my
> site's krb5.conf.  The only remaining issue I'm running into is with
> 'default_tgs_enctypes'.  I'd love to get it into a sequence, but I can't
> seem to figure out how.  The attached patch gets me really close, where
> I've got a sequence called 'type' under default_tgs_enctypes, but the extra
> part of the tree seems to be extra rather than useful, plus it seems to
> make setting those things a bit messy when it wasn't before - Was
> /files/etc/krb5.conf/**libdefaults/default_tgs_**enctypes = 'thing' my
> changes make /files/etc/krb5.conf/**libdefaults/default_tgs_**enctypes/type[x]
> = 'thing' which is not right.....
>
>

The patch you attached leads to an ambiguity:

$ augparse -I . krb5.aug
Syntax error in lens definition
krb5.aug:49.0-53.87:Failed to compile libdefaults
krb5.aug:47.26-.71:exception: ambiguous iteration
      Iterated regexp: /([a-zA-Z0-9]+-[a-zA-Z0-9]+-[a-zA-Z0-9]+)([ \t,]*)/
      'A-A-AAA-A-A' can be split into
      'A-A-A|=|AA-A-A'

     and
      'A-A-AA|=|A-A-A'

    Iterated lens: krb5.aug:47.26-.70:




> If I may ask three questions:
>
> So what can I do to get the sequence to populate when there are multiple
> items, but not when there are not?
> And how do I use the regex match for the sequence name?
> Is my attempt at a fix even on the right track?
>


If you mean to generate an array only where there is more than one element,
and use a fix value otherwise, dynamically, then it's a rather bad idea,
since it will make it hard to add a second value to an existing unique one.

However, if supporting arrays vs single values is linked to specific keys,
they you could explicitely split the cases to have a lens for array entries
and another lens for simple entries. This is already done in quite a few
modules.


Raphaël
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