[Spacewalk-list] Variables not passing to snippets

[Michael Gliwinski]

On Friday 04 Feb 2011 13:19:43 Hagberg, Keith wrote:
> What determines when you need raw mode.

Basically with templating you have two levels at which $-variables are 
interpreted.  If you want them interpreted when the kickstart is generated, do 
*not* escape them, if you want them interpreted by the shell at kickstart time 
(pre/post script) *do* escape them.

The '#raw' thing is a method for escaping entire blocks.  That is you need to 
use it when you want an entire block passed to shell at kickstart time as is, 
it disables templating of the encompassed block.

> If I remove #raw and #end raw the snippet does not get put into the
> kickstart. When the kickstart is created it still has the snippet  name in
> it.

The '$SNIPPET()' is an instruction to the templating system.  The '#raw' block 
disables templating.

> I tried to escape the $ETH variable and it still will not replace it.

Where do you define ETH?  Is it a variable defined in 'Kickstart 
Details/Variables' section in the wizard?

If so then you actually do *not* want to escape it.

> Here is my snippet
> 
> #raw

#raw disables templating so you don't want it here.

> SPEED=`ethtool $ETH | grep Speed | cut -d' ' -f2`

SPEED is a shell variable defined at the kickstart time, so $-references to it 
*will* need to be escaped.

> if [ "$SPEED" == "1000Mb/s" ]; then

like here, this should be ... "\$SPEED" == "1000Mb/s" ...

>    echo NIC running at 1000mb/s
>    echo "ETHTOOL_OPTS=\"speed 1000 duplex full autoneg on\"" >>
> /etc/sysconfig/network-scripts/ifcfg-$ETH echo "Resetting "$ETH

if ETH is a template variable then it should stay as is (unescaped)

>    ifup $DEV

what's DEV?

> elif [ "$SPEED" == "100Mb/s" ]; then

again, SPEED needs to be escaped here

>    echo NIC running at 100mb/s
>    echo "ETHTOOL_OPTS=\"speed 100 duplex full autoneg off\"" >>
> /etc/sysconfig/network-scripts/ifcfg-"$ETH" echo "Resetting "$ETH
>    ifup $ETH

and ETH stays as is

> else
>    echo could not determine speed
> fi
> ethtool $ETH

likewise here

> #end raw

and get rid of that.

Hope I managed to explain this a bit.

Remember that you also need the script where you're including the '$SNIPPET()' 
call to have the 'Template' option checked, as otherwise it will be implicitly 
wrapped in '#raw' and '#end raw' statements which would disable templating 
(and therefore prevent ETH variable from being resolved in your example).


-- 
Michael Gliwinski
Henderson Group Information Services
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Phone: 028 9034 3319

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