[augeas-devel] Wildcarded key/value pairs and nested blocks (dovecot lens development)

[Raphaël Pinson]

On Wed, Mar 6, 2013 at 4:54 PM, Serge Smetana <serge.smetana at gmail.com>wrote:

> Hi Raphaël,
>
> Thank you very much for the comments.
> I cannot apply all of them because currently we use Augeas 0.10 but
> will make changes for the rest.
>
> My main question was is there any way to describe keys as regexp
> instead of having fixed list and to have lens for the blocks without
> "overlapping lenses" exception?
>


Sure, you can use regexps for keys. You can write things like:

    key /(no)?flag/

or:

    key /one|two|three/

for example.


As for the blocks, you could have a look at the way keepalived was written
before Build.block* constructs were introduced. Keep in mind that
Build.block* constructs cost me quite a few hours of headaches to properly
cover edge cases, and implementing these cases manually will be hard.



Raphaël




>
> Thank you.
>
> Serge
>
> On Wed, Mar 6, 2013 at 9:35 AM, Raphaël Pinson
> <raphael.pinson at camptocamp.com> wrote:
> > Hi Serge,
> >
> >
> > Great job! I've left some comments on github directly.
> >
> >
> > Regards,
> >
> > Raphaël
> >
> >
> > On Tue, Mar 5, 2013 at 7:28 PM, Serge Smetana <serge.smetana at gmail.com>
> > wrote:
> >>
> >> Hello,
> >>
> >> I'm trying to create lens for Dovecot config.
> >> I'm already have working lens here:
> >>
> >>
> https://github.com/smetana/augeas/commit/0cbd6b88e0f1bf2e281fa3ea16803abbf8b3d770
> >>
> >> But it is too "tight" because of the fixed list of keywords for the
> >> entries.
> >> Dovecot supports blocks and nested blocks like
> >>
> >> service auth {
> >>   unix_listener auth-userdb {
> >>      ...
> >>   }
> >> }
> >>
> >> and if I create wildcarded lens for simple entry
> >>
> >>    let entry = [ indent . key Rx.word. eq . (store value)? . eol ]
> >>
> >> I am unable to create lens for the block
> >>
> >>    let block_names = ("protocol" | "service" | "plugin" | "namespace" |
> >> "map" )
> >>    let block =
> >>        [ indent . key block_names . block_args? . block_open . eol
> >>        . (entry | empty | comment)*
> >>        . indent . block_close . eol ]
> >>
> >> I end up with exception: overlapping lenses in tree union.put
> >>     Example matched by both:  { "protocol" }
> >>
> >> Is there any way to define possible keys as something like a
> >> subsctraction (Rx.word - block_names)
> >> meaning "match anything but not /protocol|service|map/"?
> >>
> >> Thank you!
> >> Great job!
> >>
> >> Serge
> >>
> >> _______________________________________________
> >> augeas-devel mailing list
> >> augeas-devel at redhat.com
> >> https://www.redhat.com/mailman/listinfo/augeas-devel
> >
> >
> >
> >
> > --
> > Raphaël Pinson
> > Administrateur Systèmes & Réseaux
> > Camptocamp France
> > Savoie Technolac
> > BP 352
> > 48, avenue du Lac du Bourget
> > 73372 Le Bourget du Lac, Cedex
> > www.camptocamp.com
>



-- 
Raphaël Pinson
Administrateur Systèmes & Réseaux
Camptocamp France
Savoie Technolac
BP 352
48, avenue du Lac du Bourget
73372 Le Bourget du Lac, Cedex
www.camptocamp.com
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