# common/manifests/defines/line.pp -- a trivial mechanism to ensure a line exists in a file
# Copyright (C) 2007 David Schmitt <david@schmitt.edv-bus.at>
# See LICENSE for the full license granted to you.

# Usage:
# line { description:
# 	file => "filename",
# 	line => "content",
# 	ensure => {absent,*present*}
# }
#
# Example:
# The following ensures that the line "allow ^$munin_host$" exists
# in /etc/munin/munin-node.conf, and if there are any changes notify the service for
# a restart
#
# line { allow_munin_host:
#       file => "/etc/munin/munin-node.conf",
#       line => "allow ^$munin_host$",
#       ensure => present,
#       notify => Service[munin-node],
#       require => Package[munin-node],
# }
#
#
define line($file, $line, $ensure = 'present') {
	case $ensure {
		default : { err ( "unknown ensure value '${ensure}'" ) }
		present: {
			exec { "echo '${line}' >> '${file}'":
				unless => "grep -qFx '${line}' '${file}'"
			}
		}
		absent: {
			exec { "perl -ni -e 'print if \$_ ne \"${line}\n\";' '${file}'":
				onlyif => "grep -qFx '${line}' '${file}'"
			}
		}
	}
}