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________________________________
> From: danpg102(a)hotmail.com
> To: cobbler(a)lists.fedorahosted.org
> Subject: Snippet with generalized functions
> Date: Mon, 28 Jul 2008 18:26:37 -0500
>
> Attached is a snippet that makes use of cheetah methods. These are similar to some of
the functionality that the Solaris SST offers. They basically encapsulate many (usually
obscure) sed commands into handy functions.
>
$set_config_value('/etc/login.defs', 'LOGIN_RETRIES', 3)
is more readable than:
perl -npe 's/^([ \t]*$LOGIN_RETRIES[ \t]+)[\x21-\x7E]*([
\t]*(#.*)?)$/\${1}3\${2}/' -i '/etc/login.defs'
and the perl (sed) command doesn't take into account the possibility that
LOGIN_RETRIES may not already be present in the file. The use of a function makes
kickstart templates more readable and helps avoid errors.
Because of the utility of these functions, I would suggest they be distributed with
cobbler, possibly as 'built-in' methods.
Development note: although I have tested that these functions do not cause any Cheetah
errors, I have not tested the resulting kickstarts in an actual provision. They may still
cause errors on the client side :( .
~
Dan
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Dan,
Neat. Do you have a patch to cobbler to make this automatically
available to all cobbler templates? Something like this might be
interesting.
Basically I think it's just an edit to templar.py to insert the include
at the top of all the templates, and we could ship it in
/etc/cobbler/cheetah.includes or something?
I'm also interested in your generalization of Snippet inclusion with the
"Advanced Snippet" functionality down to Cheetah functions, as that
function is something we could also include in that file.
--Michael