Puppet users - Jan 2013 - How to manage one line in a file by puppet

Hi,

I want to write a puppet module for xen on Debian. This module will need
to manage one line in the file /etc/default/grub, namely the line
starting with "GRUB_CMDLINE_XEN=". Currently I want to leave the rest
of
the file untouched.

Which would be the best way to do this?

I see two options:

a) Do some `sed` magic on the file in a `exec` call. Downside: puppet
won''t notice when the line gets manually changed.

b) Have some support for sections inside files, like this:

[... part of file untouched by puppet ...]
###
# BEGIN MANAGED BY PUPPET: IDENTIFIEROFPUPPETRESOURCE
###
GRUB_CMDLINE_XEN=''my options''
###
# END MANAGED BY PUPPET: IDENTIFIEROFPUPPETRESOURCE
###
[... rest of file untouched by puppet ...]

Is there support for something like this?

Cheers, Andreas.

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I''m doing this with the augeas piece like so:

augeas { ''make_grub_verbose'':
      context => ''/files/etc/grub.conf'',
      changes => [
                    ''rm hiddenmenu'',
                    ''rm splashimage'',
                 ],
   }

You should be able to use those features as you like.


--Jerald


On Jan 4, 2013, at 12:46 PM, Andreas Hilboll <lists@hilboll.de> wrote:
> Hi,
> 
> I want to write a puppet module for xen on Debian. This module will need
> to manage one line in the file /etc/default/grub, namely the line
> starting with "GRUB_CMDLINE_XEN=". Currently I want to leave the
rest of
> the file untouched.
> 
> Which would be the best way to do this?
> 
> I see two options:
> 
> a) Do some `sed` magic on the file in a `exec` call. Downside: puppet
> won''t notice when the line gets manually changed.
> 
> b) Have some support for sections inside files, like this:
> 
> [... part of file untouched by puppet ...]
> ###
> # BEGIN MANAGED BY PUPPET: IDENTIFIEROFPUPPETRESOURCE
> ###
> GRUB_CMDLINE_XEN=''my options''
> ###
> # END MANAGED BY PUPPET: IDENTIFIEROFPUPPETRESOURCE
> ###
> [... rest of file untouched by puppet ...]
> 
> Is there support for something like this?
> 
> Cheers, Andreas.
> 
> -- 
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> 
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> Hi,
> 
> I want to write a puppet module for xen on Debian. This module will need
> to manage one line in the file /etc/default/grub, namely the line
> starting with "GRUB_CMDLINE_XEN=". Currently I want to leave the
rest of
> the file untouched.
> 
> Which would be the best way to do this?
> 
Would the file_line resource from the puppetlabs stdlib do what you
want?

http://puppetlabs.com/blog/module-of-the-week-puppetlabsstdlib-puppet-labs-standard-library/

-Steve

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Hi!

On Fri, Jan 4, 2013 at 9:46 AM, Andreas Hilboll <lists@hilboll.de>
wrote:
> Hi,
>
> I want to write a puppet module for xen on Debian. This module will need
> to manage one line in the file /etc/default/grub, namely the line
> starting with "GRUB_CMDLINE_XEN=". Currently I want to leave the
rest of
> the file untouched.
>
> Which would be the best way to do this?
>
> I see two options:
There''s an extra option involving augeas that may work for you:
    http://projects.puppetlabs.com/projects/1/wiki/puppet_augeas

Thanks,
Roman.

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http://docs.puppetlabs.com/references/latest/type.html#augeas

http://forge.puppetlabs.com/puppetlabs/stdlib (file_line with match parameter)


“Sometimes I think the surest sign that intelligent life exists elsewhere in the
universe is that none of it has tried to contact us.”
Bill Waterson (Calvin & Hobbes)

----- Original Message -----
From: "Andreas Hilboll" <lists@hilboll.de>
To: "Puppet Users" <puppet-users@googlegroups.com>
Sent: Friday, January 4, 2013 12:46:34 PM
Subject: [Puppet Users] How to manage one line in a file by puppet

Hi,

I want to write a puppet module for xen on Debian. This module will need
to manage one line in the file /etc/default/grub, namely the line
starting with "GRUB_CMDLINE_XEN=". Currently I want to leave the rest
of
the file untouched.

Which would be the best way to do this?

I see two options:

a) Do some `sed` magic on the file in a `exec` call. Downside: puppet
won''t notice when the line gets manually changed.

b) Have some support for sections inside files, like this:

[... part of file untouched by puppet ...]
###
# BEGIN MANAGED BY PUPPET: IDENTIFIEROFPUPPETRESOURCE
###
GRUB_CMDLINE_XEN=''my options''
###
# END MANAGED BY PUPPET: IDENTIFIEROFPUPPETRESOURCE
###
[... rest of file untouched by puppet ...]

Is there support for something like this?

Cheers, Andreas.

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Thanks guys, you''re amazing :) While augeas looks like a powerful tool,
I went for the quick''n''easy file_line resource, with a match
parameter
to ensure the parameter isn''t set multiple times.

Cheers, have a nice weekend!
Andreas.

Am 04.01.2013 20:06, schrieb Stephen Jahl:
>> Hi,
>>
>> I want to write a puppet module for xen on Debian. This module will
need
>> to manage one line in the file /etc/default/grub, namely the line
>> starting with "GRUB_CMDLINE_XEN=". Currently I want to leave
the rest of
>> the file untouched.
>>
>> Which would be the best way to do this?
>>
> 
> Would the file_line resource from the puppetlabs stdlib do what you
> want?
> 
>
http://puppetlabs.com/blog/module-of-the-week-puppetlabsstdlib-puppet-labs-standard-library/
> 
> -Steve
> 
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