Hi folks,
This is a "best practices" question as much as a technical one.
I am trying to redefine variables when I include a specific class. The
use case is installing php 5.3 on a few select centos 5 boxes while
keeping the default php 5.1 install on others. Here is the relevant part
of my apache module:
---------------------------------------------------------------------
class apache::php inherits apache::base {
include apache::params
package { 'php':
name => $apache::params::php_package,
ensure => installed,
require => Package['httpd'],
notify => Service['httpd'];
'php-gd':
name => $apache::params::php_gd_package,
ensure => installed,
require => Package['php'],
notify => Service['httpd'];
'php-imap':
name => $apache::params::php_imap_package,
ensure => installed,
require => Package['php'],
notify => Service['httpd'];
'php-ldap':
name => $apache::params::php_ldap_package,
ensure => installed,
require => Package['php'],
notify => Service['httpd'];
}
}
class apache::php53 inherits apache::php {
# $os is defined in site.pp.
if $::os == 'rhel5' {
# Dirty hack. Yuck.
exec { '/usr/bin/yum -y replace php --replace-with php53u':
onlyif => '/bin/rpm -q php',
# Class common::redhat::el::el5 installs yum-plugin-replace.
require => Class['common::redhat::el::el5'],
notify => Service['httpd'],
}
}
else {
warning 'Class apache::php53 should only ever be defined for RHEL5 and its
clones.'
}
}
class apache::params {
case $::os {
# .../...
'rhel5': {
$httpd_package = 'httpd'
$httpd_service = 'httpd'
$rootdir = '/var/www/html'
if defined(Class['apache::php53']) {
$php_package = 'php53u'
$php_gd_package = 'php53u-gd'
$php_imap_package = 'php53u-imap'
$php_ldap_package = 'php53u-ldap'
}
else {
$php_package = 'php'
$php_gd_package = 'php-gd'
$php_imap_package = 'php-imap'
$php_ldap_package = 'php-ldap'
}
}
}
}
---------------------------------------------------------------------
When I add the apache::php53 to my host (I use LDAP as a node classifier
if that matters), php and its extensions get upgraded to 5.3. However,
when I add a class that depends on apache::php53, the defined function
evaluates as false.
class wordpress {
# apache::lamp includes apache::php
include apache::lamp
if $::os == 'rhel5' {
include apache::php53
}
# .../...
}
I understand defined is quite unreliable. So I am wondering if there is
a better option (read a working one)?
Hardcoding the packages names in class apache::php53 is not enough as I
have a bunch of other classes installing additional PHP modules. I
suppose I could subclass them as well but things would probably get
quite messy quite fast.
Thanks,
--
Arnaud
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