On Sun, Dec 19, 2010 at 4:40 AM, Spenser Gilliland <spenser...@gmail.com> wrote:
> On Sun, Dec 19, 2010 at 4:14 AM, Matthew Macdonald-Wallace
> <li...@truthisfreedom.org.uk> wrote:
>> On Sun, 2010-12-19 at 01:51 -0600, Spenser Gilliland wrote:
>>> Yeap, I'm seeing that it doesn't exist yet either. I'm thinking maybe
>>> I can use exported resources or maybe just an exec that increments a
>>> counter on the host. Either way it's not very pretty. My use case is
>>> as follows:
>>>
>>> In Debian, Redmine has the option of being installed as several
>>> instances controlled by a single debconf variable. In order to
>>> utilize this feature, I need to supply debconf with the name of all
>>> instances of Redmine on the server. I've split this out into the
>>> following way: A class called Redmine which installs the Redmine
>>> package and should hold an array of all the instances of Redmine to
>>> feed to debconf using the "responsefile" parameter.
>>>
>>> So I think I've come up with a solution in my head but it involves me
>>> guaranteeing that the redmine class is instantiated before any of the
>>> redmine::instances are defined. Essentially, I'll use an
>>> environmental variable or file and clear it with the Redmine class and
>>> append to it for each redmine::instance. Maybe like below?
>>>
>>> class redmine {
>>> exec{"rm /tmp/instances && touch /tmp/instances"}
>>> }
>>>
>>> define redmine::instance
>>> exec{"echo $name >> /tmp/instances"}
>>> }
>>
>> Can you "read" (from the file system or list the redmine databases in
>> mysql/postgresql server?) a list of installed instances?
>>
>> If so, why not setup a custom fact which has all the instances listed as
>> a csv string:
>>
>> ========== PSEUDO CODE!!! ==========
>> instances = read_instances() # a class which connects to the db/file
>> # system to read in the instances and converts them to CSV format #
>>
>> Facter.add redmine_instances do
>> setcode do
>> instances
>> end
>> end
>> ===================================
>>
>> and then template the /tmp/instances file using erb:
>>
>> ========== PSEUDO CODE!!! ============
>> <% redmine_instances.each do |instance| -%>
>> instance
>> <% end -%>
>> ======================================
>>
>> Your manifest could then source this template onto the file system and
>> feed the file to debconf.
>>
>> It's a bit more long winded, however it means that if you want to add
>> instances, you just add an extra value to the fact.
>>
>> We use this technique to manage MySQL replication and it works really
>> well!
>>
>> Cheers,
>>
>> M.
>>
>>
>>
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>
> Matthew,
>
> I'm a bit confused on your code, how does an instance get added to the db?
>
> Matthias
>
> Approach one won't work, I am doing this from multiple different
> locations in the code. Also because this is eventually something I
> want to hide I would probably just set it up using a variable in the
> node definition and have it read by the redmine class.
>
> node redmine {
> $instances = ["john", "ted", "nancy"]
> include redmine
> redmine::instance{"john", "ted", "nancy"}
> }
>
> Approach two is similar to Matthews, so I have the same question how
> do I add an instance to the db?
>
> Thanks,
> Spenser
>
> --
> Spenser Gilliland
> Computer Engineer
> Illinois Institute of Technology
>
Also, just out of interest. Would it make sense to create a feature
request for this? I can think of quite a few instances where this
would be useful.
Thanks,
Spenser
--
Spenser Gilliland
Computer Engineer
Illinois Institute of Technology
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