adamwolf@xxxxxxxxxxxxxxxxxxxx wrote:
Hennessey Daniel wrote:
Hey people,
I am trying to use the ksmeta="" construct to pass a list of
dictionaries through to the kickstart file where I am using a cheetah
"#for $var in $vars" loop to unravel them.
Is this possible?
Achieving that result is possible, though as you've entered it, the
variable will just be a string, not a data structure. --ksmeta in the
command line allows for "key=value key=value" ... key/value pairs
seperated by spaces. Those values aren't evaluated to be Python data
structures.
I have not really used Cheetah for ultra-advanced templating usage,
though it does allow executing arbitrary python code, so in theory,
you could pass in arbitrary strings and work on them in Python,
including evaling them to create real data structures. Whether this
works
as advertised I don't know... though I could definitely use some more
advanced templating examples for the Wiki.
I'd be inclined to take a simpler approach though, and pass in simple
variables like --ksmeta="eth0=dhcp eth1=dhcp", and then check
for the values of those expressions, possibly in conjunction with "#if"
templating
#if defined $eth0 # syntax for this is probably wrong :)
some line containing value for $eth0
#end
etc
I spent some time working with this today.
Cheetah allows you to use #if $variable as a shortcut for "is the variable
defined?"
This shortcut will not work with Cobbler. If something like that is
written in a kickstart template, and the profile with which it is
associated doesn't have the variable in its ksmeta, cobbler sync will
crash.
Interesting... I'll take a look at this. There may be a workaround in
the way we are using the Cheetah API.
There's a workaround.
Instead of using the shortcut to see if the variable is defined, define it
to "none" or something obviously wrong/null in the profile.
For example, we have default printer information stored in Cobbler. If we
set the profile to have the ksmeta pair of DefaultPrinter=none, our
kickstart template can have the section
#if $DefaultPrinter != "none"
lpoptions -d $DefaultPrinter
#end if
It works, and is only slightly less elegant than the (not working)
#if $DefaultPrinter
lpoptions -d $DefaultPrinter
#end if
I'm running the git sources from 2 days ago, if it matters to anyone.
Adam Wolf
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