Puppet users - Jul 2012 - execute a command if a package isn't installed, then install the package

Hi, I''m trying to install the ''unbound'' dns resolver
in ubuntu via
puppet and I''m running into some issues.  The issue isn''t that
the
package doesn''t install, but rather that apt automatically starts the
daemon - and when the daemon starts, it updates resolv.conf in a way
that breaks DNS.

There''s a command, ''resolvconf --disable-updates''
that will stop
unbound from making the change it wants to.  What I''d like to do is:

- If unbound isn''t installed, then execute --disable-updates
- Then install unbound
- Then --enable-updates

Is there anyway to do this?  Thanks.

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On Jul 14, 2012, at 5:19 PM, loki77 <loki77@gmail.com> wrote:
> Hi, I''m trying to install the ''unbound'' dns
resolver in ubuntu via
> puppet and I''m running into some issues.  The issue isn''t
that the
> package doesn''t install, but rather that apt automatically starts
the
> daemon - and when the daemon starts, it updates resolv.conf in a way
> that breaks DNS.
> 
> There''s a command, ''resolvconf
--disable-updates'' that will stop
> unbound from making the change it wants to.  What I''d like to do
is:
> 
> - If unbound isn''t installed, then execute --disable-updates
> - Then install unbound
> - Then --enable-updates
> 
> Is there anyway to do this?  Thanks.
You can either write a custom fact that gets set when unbound is
installed/active and use that in an if block around the stop-install-start
procedure, or use the ''resolvconf --disable-updates'' exec
resource''s ''unless'' parameter to test for a running
unbound daemon prior to installing the package.

--
Peter Bukowinski

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The only downside to that is that resolvconf could be left disabled
for longer than just the installation of the package.  While I don''t
think this will be a problem in most cases I''m hoping there''s
another
way to handle this.  Thanks!

On Jul 14, 3:30 pm, Peter Bukowinski <pmb...@gmail.com>
wrote:
> On Jul 14, 2012, at 5:19 PM, loki77 <lok...@gmail.com> wrote:
>
> > Hi, I''m trying to install the ''unbound'' dns
resolver in ubuntu via
> > puppet and I''m running into some issues.  The issue
isn''t that the
> > package doesn''t install, but rather that apt automatically
starts the
> > daemon - and when the daemon starts, it updates resolv.conf in a way
> > that breaks DNS.
>
> > There''s a command, ''resolvconf
--disable-updates'' that will stop
> > unbound from making the change it wants to.  What I''d like to
do is:
>
> > - If unbound isn''t installed, then execute --disable-updates
> > - Then install unbound
> > - Then --enable-updates
>
> > Is there anyway to do this?  Thanks.
>
> You can either write a custom fact that gets set when unbound is
installed/active and use that in an if block around the stop-install-start
procedure, or use the ''resolvconf --disable-updates'' exec
resource''s ''unless'' parameter to test for a running
unbound daemon prior to installing the package.
>
> --
> Peter Bukowinski
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Hi
On 15.07.2012, at 00:30, Peter Bukowinski wrote:
> On Jul 14, 2012, at 5:19 PM, loki77 <loki77@gmail.com> wrote:
> 
>> Hi, I''m trying to install the ''unbound'' dns
resolver in ubuntu via
>> puppet and I''m running into some issues.  The issue
isn''t that the
>> package doesn''t install, but rather that apt automatically
starts the
>> daemon - and when the daemon starts, it updates resolv.conf in a way
>> that breaks DNS.
>> 
>> There''s a command, ''resolvconf
--disable-updates'' that will stop
>> unbound from making the change it wants to.  What I''d like to
do is:
>> 
>> - If unbound isn''t installed, then execute --disable-updates
>> - Then install unbound
>> - Then --enable-updates
>> 
>> Is there anyway to do this?  Thanks.
> 
> You can either write a custom fact that gets set when unbound is
installed/active and use that in an if block around the stop-install-start
procedure, or use the ''resolvconf --disable-updates'' exec
resource''s ''unless'' parameter to test for a running
unbound daemon prior to installing the package.

You can use require and notify within the package resource to run exec
statements.

e.g. (untested)

exec { ''disable'':
	command => ''/path/to/resolvconf --disable-updates'',
	onlyif => ''dpkg -l | grep -c unbound | wc -l'',
}
exec { ''enable'':
	command => ''/path/tp/resolvconf --enable-updates'',
	unless => ''dpkg -l | grep -c unbound | wc -l'',
}
package { ''unbound'':
	requires => Exec[''disable''],
	notify => Exec[''enable''],
}

- Martin

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