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# 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.
# Ensures that a specific line is present or absent in a file. This can
# be very brittle, since even small changes can throw this off.
#
# If the line is not present yet, it will be appended to the file.
#
# The name of the define is not used. Just keep it (globally) unique and
# descriptive.
#
# Use this only for very trivial stuff. Usually replacing the whole file
# is a more stable solution with less maintenance headaches afterwards.
#
# 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}'"
}
}
}
}
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