Adds a new apt source to the sources.list.d. Runs apt-get update for only that source and installs a package from the new source.

apt-update-init.pp

define apt-update-single($repofile=$title,$source){
	file{"/etc/apt/sources.list.d/${repofile}.list":
		ensure=>'present',
		content=>$source,
	}

	exec{"apt-get-update-$repofile":
		command=>"/usr/bin/apt-get update -o Dir::Etc::sourcelist=\"sources.list.d/${repofile}.list\" -o Dir::Etc::sourceparts=\"-\" -o APT::Get::List-Cleanup=\"0\"",
		require=>File["/etc/apt/sources.list.d/${repofile}.list"],
		unless=>"/bin/ls /var/lib/apt/lists/|grep $repofile 2>/dev/null"
	}
}

apt-update-single{'sublime':
	source=>'deb http://ppa.launchpad.net/webupd8team/sublime-text-2/ubuntu raring main'
}

package{'sublime-text':
 ensure => 'present',
 require => Apt-update-single['sublime']
}

unless=>"/bin/ls /var/lib/apt/lists/|grep $repofile 2>/dev/null"
I still feel iffy about that line. Its works in the two cases I am using it for but I am sure it wont for all cases. It looks in the place that ubuntu dumps its package databases to try and guess if this repository had previously been apt-get updated. If it sees the file with the matching name it skips it. This lets me keep reprovisioning down to 0.38 seconds.