Re: [Puppet Users] Augeas JSON example?

[John Simpson]

On 2013-11-13, at 1456, David Lutterkort lut...@puppetlabs.com wrote:

 I don't have any examples handy, but the easiest way to try out managing the 
 file with Puppet is to store it somewhere, say /tmp/file.json and then play 
 around with it in augtool:

That's what I eventually ended up doing, and after several hours of tinkering 
with it I was able to come up with most of what I need - I have puppet 
templates which store strings and numbers in the top-level dict within the 
JSON file.

The last part is being able to maintain an array of dictionaries within the 
top-level dict (in particular, an array of LDAP DN's.) In the file, it looks 
like this:

{
  server : hostname.domain.xyz ,
  port   : 12345 ,
  groups : [
{ dn : cn=Users,dc=domain,dc=xyz } ,
{ dn : cn=Admins,dc=domain,dc=xyz }
  ]
}

In augtool, I am able to do the following:

set /augeas/load/Json/lens Json.lns
set /augeas/load/Json/incl /tmp/file.json
load
set /files/tmp/file.json/dict/entry[last()+1] 'groups'
touch /files/tmp/file.json/dict/entry[last()]/array

However, when I try to do it in Puppet:

  augeas { groups_array :
incl= '/tmp/file.json' ,
lens= 'Json.lns' ,
changes = [
  set dict/entry[last()+1] 'groups' ,
  touch dict/entry[last()]/array ,
] ,
onlyif  = match dict/entry[*][.='groups'] size == 0 ,
require = File['/tmp/file.json'] ,
  }

I get the following error:

Error: /Stage[main]/Module::Groups/Augeas[groups_array]: Could not evaluate: 
Unknown command touch

Does the Puppet augeas module not support the touch command at all? If not, 
is there a way to declare an array like this, without declaring a member of the 
array at the same time? The class itself declares the array, and it also 
defines a template that another class will call one or more times to add items 
to the array. Different machines will need different numbers of items in the 
array, and some machines may not need any items at all.

The most frustrating thing to me is how little documentation there seems to be 
out there, about using the JSON lens. The augeas web site doesn't list it with 
the other lenses, and on the list of core lenses page it's there but the link 
goes to a page which doesn't exist. I think it's amazing that I was able to 
cobble together what I already have, and I think once I get this all figured 
out, I'll have to write a page on my personal web site explaining it.

--
John Simpson j...@voalte.com
Unix System/VM Developer and Engineering Operations, Voalte
+1 (941) 312-2830 x148

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[Puppet Users] Augeas JSON example?

[John Simpson]

Greetings.

I'm trying to find a few concrete examples of how to use augeas within a Puppet 
module, to make changes to a JSON file. I've been googling for the past hour 
and a half, and while I have found several pages which provide reference-type 
documentation, I have yet to see a single usable example. All of the augeas 
examples seem to demonstrate how to maintain a file for which some other lens 
applies, such as /etc/hosts or /etc/ssh/sshd_config.

My situation: I have a system-wide JSON file which contains a series of 
key-value pairs, like so:

{
  svc_host : server.domain.xyz ,
  svc_port : 12345 ,
  svc_user : username ,
  svc_pass : password ,

  versions : [ 1.0 , 1.0.1 , 1.0.2 ] ,

  agent_installed : 1383331588 ,

  comment  : This is a gratuitous comment.
}

I know that JSON is probably not be the best format for the file, but it's 
human readable, and it saves us having to write and debug configuration file 
parsing routines in seven different languages on four platforms.

I would like to be able to use Puppet modules to maintain the file. My first 
thought, of course, was to use a template, but there are several different 
components of the system which all store data in the one file, so different 
modules need to maintain different sets of keys within the file.

Is anybody doing something similar, and if so, would you mind sharing the 
relevant bits of your manifests? Or point me to an example of a WORKING augeas 
resource which adds or 

--
John Simpson j...@voalte.com
Unix System/VM Developer and Engineering Operations, Voalte
+1 (941) 312-2830 x148

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