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# A system to construct files using fragments from other files or templates.
#
# This requires at least puppet 0.25 to work correctly as we use some
# enhancements in recursive directory management and regular expressions
# to do the work here.
#
# USAGE:
# The basic use case is as below:
#
# concat{"/etc/named.conf":
# notify => Service["named"]
# }
#
# concat::fragment{"foo.com_config":
# target => "/etc/named.conf",
# order => 10,
# content => template("named_conf_zone.erb")
# }
#
# # add a fragment not managed by puppet so local users
# # can add content to managed file
# concat::fragment{"foo.com_user_config":
# target => "/etc/named.conf",
# order => 12,
# ensure => "/etc/named.conf.local"
# }
#
# This will use the template named_conf_zone.erb to build a single
# bit of config up and put it into the fragments dir. The file
# will have an number prefix of 10, you can use the order option
# to control that and thus control the order the final file gets built in.
#
# SETUP:
# The class concat::setup defines a variable $concatdir - you should set this
# to a directory where you want all the temporary files and fragments to be
# stored. Avoid placing this somewhere like /tmp since you should never
# delete files here, puppet will manage them.
#
# There's some regular expression magic to figure out the puppet version but
# if you're on an older 0.24 version just set $puppetversion = 24
#
# Before you can use any of the concat features you should include the
# class concat::setup somewhere on your node first.
#
# DETAIL:
# We use a helper shell script called concatfragments.sh that gets placed
# in /usr/local/bin to do the concatenation. While this might seem more
# complex than some of the one-liner alternatives you might find on the net
# we do a lot of error checking and safety checks in the script to avoid
# problems that might be caused by complex escaping errors etc.
#
# LICENSE:
# Apache Version 2
#
# LATEST:
# http://github.com/ripienaar/puppet-concat/
#
# CONTACT:
# R.I.Pienaar <rip@devco.net>
# Volcane on freenode
# @ripienaar on twitter
# www.devco.net
# Sets up so that you can use fragments to build a final config file,
#
# OPTIONS:
# - mode The mode of the final file
# - owner Who will own the file
# - group Who will own the file
# - force Enables creating empty files if no fragments are present
# - warn Adds a normal shell style comment top of the file indicating
# that it is built by puppet
# - backup Controls the filebucketing behavior of the final file and
# see File type reference for its use. Defaults to 'puppet'
#
# ACTIONS:
# - Creates fragment directories if it didn't exist already
# - Executes the concatfragments.sh script to build the final file, this script will create
# directory/fragments.concat. Execution happens only when:
# * The directory changes
# * fragments.concat != final destination, this means rebuilds will happen whenever
# someone changes or deletes the final file. Checking is done using /usr/bin/cmp.
# * The Exec gets notified by something else - like the concat::fragment define
# - Copies the file over to the final destination using a file resource
#
# ALIASES:
# - The exec can notified using Exec["concat_/path/to/file"] or Exec["concat_/path/to/directory"]
# - The final file can be referened as File["/path/to/file"] or File["concat_/path/to/file"]
define concat($mode = 0644, $owner = "root", $group = "root", $warn = "false", $force = "false", $backup = "puppet") {
$safe_name = regsubst($name, '/', '_', 'G')
$concatdir = $concat::setup::concatdir
$version = $concat::setup::majorversion
$fragdir = "${concatdir}/${safe_name}"
$concat_name = "fragments.concat.out"
$default_warn_message = '# This file is managed by Puppet. DO NOT EDIT.'
case $warn {
'true',true,yes,on: { $warnmsg = "$default_warn_message" }
'false',false,no,off: { $warnmsg = "" }
default: { $warnmsg = "$warn" }
}
$warnmsg_escaped = regsubst($warnmsg, "'", "'\\\\''", 'G')
$warnflag = $warnmsg_escaped ? {
'' => '',
default => "-w '$warnmsg_escaped'"
}
case $force {
'true',true,yes,on: { $forceflag = "-f" }
'false',false,no,off: { $forceflag = "" }
default: { fail("Improper 'force' value given to concat: $force") }
}
File{
owner => root,
group => root,
mode => $mode,
backup => $backup
}
file{$fragdir:
ensure => directory;
"${fragdir}/fragments":
ensure => directory,
recurse => true,
purge => true,
force => true,
ignore => [".svn", ".git", ".gitignore"],
source => $version ? {
24 => "puppet:///concat/null",
default => undef,
},
notify => Exec["concat_${name}"];
"${fragdir}/fragments.concat":
ensure => present;
"${fragdir}/${concat_name}":
ensure => present;
$name:
ensure => present,
source => "${fragdir}/${concat_name}",
owner => $owner,
group => $group,
checksum => md5,
mode => $mode,
alias => "concat_${name}";
}
exec{"concat_${name}":
user => root,
group => root,
notify => File[$name],
subscribe => File[$fragdir],
alias => "concat_${fragdir}",
require => [ File["/usr/local/bin/concatfragments.sh"], File[$fragdir], File["${fragdir}/fragments"], File["${fragdir}/fragments.concat"] ],
unless => "/usr/local/bin/concatfragments.sh -o ${fragdir}/${concat_name} -d ${fragdir} -t ${warnflag} ${forceflag}",
command => "/usr/local/bin/concatfragments.sh -o ${fragdir}/${concat_name} -d ${fragdir} ${warnflag} ${forceflag}",
}
}
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