[Puppet Users] escaping the @ symbol
Hi
I've been writing a little module to handle some grub settings on RHEL
6 and appear the have run into a silly little problem that I just
can't fix.
I've trying to append the string crashkernel=128M@16M to the kernel
line in my grub.conf. The following module works 100% if I leave out
the @ symbol. Any ideas how I can escape the @ ??
I know I can use crashkernel=auto but I would like to know how
to insert any string I chooseeven an @.
Thanks
init.pp:
class grub {
include grub::grub
grub::set {
timeout: value = 10;
}
grub::insert {
/files/boot/grub/grub.conf/title/kernel/ro: value =
'crashkerne128M@16M';
}
}
grub.pp:
class grub::grub {
define set ( $value ) {
$key = $name
$context = /files/boot/grub/grub.conf
augeas { grub_conf/$key:
context = $context,
onlyif = get $key != '$value',
changes = set $key '$value',
incl= '/boot/grub/grub.conf',
lens= 'grub.lns',
}
}
define insert ( $value ) {
$key = $name
$context = /files/boot/grub/grub.conf
augeas { grub_conf/$key:
context = $context,
changes = insert '$value' after \'$key',
incl= '/boot/grub/grub.conf',
lens= 'grub.lns',
}
}
file { grub_conf:
name = $operatingsystem ? {
default = /boot/grub/grub.conf,
},
}
}
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Re: [Puppet Users] escaping the @ symbol
On 02/04/12 11:07, bruce bushby wrote:
Hi
I've been writing a little module to handle some grub settings on RHEL
6 and appear the have run into a silly little problem that I just
can't fix.
I've trying to append the string crashkernel=128M@16M to the kernel
line in my grub.conf. The following module works 100% if I leave out
the @ symbol. Any ideas how I can escape the @ ??
I know I can use crashkernel=auto but I would like to know how
to insert any string I chooseeven an @.
The code snippet below also has a typo as it's missing the =, so I
think the combination of these two missing characters meant it worked
for you. Anyway, I think that's a red herring for the real problem.
define insert ( $value ) {
$key = $name
$context = /files/boot/grub/grub.conf
augeas { grub_conf/$key:
context = $context,
changes = insert '$value' after \'$key',
This bit of code where $value is crashkernel=128M@16M isn't doing the
right thing. Augeas represents this as a label crashkernel with a
value 128M@16M. The insert command takes just the label name, not
the whole string.
This is how it should look in augtool:
augtool print /files/boot/grub/menu.lst/title[1]/kernel
/files/boot/grub/menu.lst/title[1]/kernel = /vmlinuz-3.2.10-1.fc16.x86_64
[snip]
/files/boot/grub/menu.lst/title[1]/kernel/KEYTABLE = uk
/files/boot/grub/menu.lst/title[1]/kernel/quiet
/files/boot/grub/menu.lst/title[1]/kernel/crashkernel = 128M@16M
When you use insert, if it were possible, it would create:
/files/boot/grub/menu.lst/title[1]/kernel/crashkernel=128M@16M = (none)
So instead you need to use the set command to set both the label and
value. Heading back to init.pp and using your existing define:
grub::set { /files/boot/grub/grub.conf/title[1]/kernel/crashkernel:
value = 128M@16M
}
I've also changed title to title[1] in case you have multiple
kernels in grub.conf. A better idea is to use the setm (set multiple)
command to set it on every kernel line, but you'll need Augeas 0.7.2,
ruby-augeas 0.4.0 and Puppet 2.7.0.
There's a good description here of how to use it, which you can wrap
into a define again:
http://planet.ergo-project.org/blog/jmeeuwen/2011/02/13/using-noop-io-scheduler-kvm-virtualization-through-puppet-and-augeas
Hope that helps.
--
Dominic Cleal
Red Hat Consulting
m: +44 (0)7817 878113
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