On Mon, Jan 19, 2009 at 01:28:53PM -0800, David Lutterkort wrote: > > On Sun, 2009-01-18 at 18:37 -0800, Robin Lee Powell wrote: > > Let's pretend that there was no alias type in Puppet (just > > because it's a file everyone's familiar with). Let's say that I > > wanted to set the postmaster alias to f...@bar.com using Augeas. > > The problem is, I have no idea what the Augeas path for > > postmaster is. The shell solution is something like: > > > > path=$(augtool match /files/etc/aliases/\*/name postmaster | sed > > 's;/[^/]*$;;') > > > > augtool set $path/value f...@bar.com > > This is what I am trying to address with better path expressions in > Augeas itself. That lets you write > > set "/files/etc/aliases/*[name = 'postmaster']/value" > f...@bar.com > > to do exactly the same thing.
That'd be excellent. I'd want a regex option there too, though. Any idea when this will be out? > Path expressions are modeled on XPath, and the patches I have (and > still need to clean up some, but I've never been closer) implement > a subset of XPath that makes it possible to write down pretty > powerful queries as one expression Coolness. > > I can't see any way to do anything like this in the Augeas type > > we have now, so I propose the following extensions, which would > > conflict with the "changes" argument. This would limit things > > to one change per Augeas type entry as far as I can tell, but oh > > well. > > > > command => set > > path => STRING > > value => STRING > > > > command => insert/ins > > where => before/after > > path => STRING > > value => STRING > > > > command => mv > > path => STRING > > destination => STRING > > > > command => rm/remove/delete > > path => STRING > > > > command => clear > > path => STRING > > Isn't that just splitting the mini-language that changes currently > understands into attributes on the puppet level ? I'm not sure I understand the question, but that was all from a Puppet perspective. Puppet does not give access to the results from match or get, you see, and what it does do works quite a bit differently than those. See http://reductivelabs.com/trac/puppet/wiki/TypeReference#augeas > > Nothing terribly exciting there; the new bit is that instead of > > "path" you can use one of these: > > > > match_path => STRING > > match_type => int/integer/size > > match_args => [ COMPARATOR, INT ] > > > > match_path => STRING > > match_type => regex/not_regex > > match_args => [ STRING ] > > > > match_path => STRING > > match_type => in/not_in > > match_args => [ STRING, STRING, ... ] > > > > The "size" and "in" types are basically identical to the current > > onlyif stuff. regex looks for a path that matches the given regex. > > not_in and not_regex match if the string isn't found or doesn't > > match the regex, respectively. > > This mostly maps to 'predicates' in the path expressions; I don't > have support for regex matching in there yet, but other than that > what you describe above is covered. But not actually available currently, correct? > This sort of brains (slicing and dicing the Augeas tree) really > belongs into Augeas - the Puppet type should mostly bridge the gap > between Augeas' command-oriented structure and Puppet's > state-oriented veiw of the world. Fair enough. I didn't know you were trying to do this kind of stuff on your end, and like I said, I was prepared to write the Puppet stuff myself, because I can. I really can't help you with the Augeas stuff, and I'm feeling impatient. :) I'll try to hold off, though. -Robin -- They say: "The first AIs will be built by the military as weapons." And I'm thinking: "Does it even occur to you to try for something other than the default outcome?" -- http://shorl.com/tydruhedufogre http://www.digitalkingdom.org/~rlpowell/ *** http://www.lojban.org/ --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Puppet Users" group. To post to this group, send email to puppet-users@googlegroups.com To unsubscribe from this group, send email to puppet-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/puppet-users?hl=en -~----------~----~----~----~------~----~------~--~---
