On Thursday 25 Feb 2010 23:19:33 Andrew Hamilton wrote:
> > unlessIf this parameter is set, then this exec will run unless the
> > command returns 0
>
> I interpret this to be the return value of the command and not the output
> of the command. So if the return value of my command is 0 then the
> command will not run, yet I can verify that the return value of the
> command is 0, yet it still runs. Unless I have this backwards and my
> interpretations are incorrect.
>
Yes, that's right, it's the return value that matters. And since grep returns
0 if match was found and 1 otherwise, this really should work.
For reference here's how my exec for creating users looks like (after
expanding some parameters):
----
exec { "psql:${name}":
command => "psql -c \"CREATE ROLE \\\"${name}\\\"",
unless => "psql -P format=unaligned -tc '\\du ${name}' |grep '^ *${name}'",
user => 'postgres',
path => ['/bin', '/sbin', '/usr/bin', '/usr/sbin', '/usr/local/bin',
'/usr/local/sbin'],
logoutput => on_failure,
require => [Service['postgresql'], User['postgres'],
}
----
Basically '-P format=unaligned' makes psql print tuples without spaces used to
align their width, it uses the default separator (|) but that can be changed
with fieldsep option. And the '-t' option makes it print tuples only (without
headers and footer). That should produce exactly one line if the user already
exists or none otherwise, the grep is mostly used to get that return value
right.
If that doesn't work for you, maybe try changing the field separator (i.e. '-P
fieldsep=,' or sth) and see if you can work with that.
Regards,
Michael
--
Michael Gliwinski
Henderson Group Information Services
9-11 Hightown Avenue, Newtownabby, BT36 4RT
Phone: 028 9034 3319
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