On Oct 13, 2008, at 10:24 AM, Joel Nimety wrote:
>
>
>
> Luke Kanies wrote:
>> On Oct 11, 2008, at 11:46 AM, Joel Nimety wrote:
>>
>>
>>
>> The problem with this is that by the time the 'file' resource has
>> gotten the 'notify' message, the file's already been changed so it's
>> too late to back it up.
>>
>> You'd either need your type to somehow track the files it's going to
>> change and back them up (which is what the ParsedFile types do), or
>> you'd need Puppet, as a whole, to keep track of files that *might*
>> change, back them up preemptively, and then remove any backups that
>> aren't needed. Or something like that.
>>
>> Either way, this isn't easy.
>
> How about a pre-notify meta parameter? Leave it to the external tool
> (augeas, exec, whatever) to decide if a file is about to be changed
> and
> notify the File resource beforehand. The File type would backup the
> file, no questions asked if notified to do so.
That would be a completely new subsystem to transactions -- instant
action. The 'notify' and 'subscribe' mechanisms all just involve
queues.
I'm not entirely convinced that's the right solution, since it's not
come up before; I'd prefer to find a way to fit it into the current
design, rather than adding new functionality.
The augeas type could do this itself, of course -- automatically back
up any files it should be notifying -- without adding a new subsystem.
--
Now and then an innocent man is sent to the legislature.
--Kin Hubbard
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Luke Kanies | http://reductivelabs.com | http://madstop.com
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