puppet_mutex
Do-nothing define to implement a mutex between classes, defines, etc.
Version information
released Nov 6th 2014
This version is compatible with:
- Puppet Enterprise 3.x
- Puppet >=2.7.20 <4.0.0
- Fedora, RedHat, CentOS, Scientific, SLES, Debian, Ubuntu
Start using this module
Add this module to your Puppetfile:
mod 'wcooley-puppet_mutex', '1.0.0'Learn more about managing modules with a PuppetfileDocumentation
wcooley/puppet_mutex — version 1.0.0 Nov 6th 2014
puppet_mutex
Do-nothing define to clearly express and enforce mutal exclusivity between classes or defines.
Sometimes one has classes which, while otherwise unrelated, should never both
be declared for the same host. For example, one generally cannot manage local
accounts while LDAP is configured for managing accounts. There is no obvious
error that this should be so, except that the useradd provider for the
user type will fail with some incomprehensible message. Pretty much
everything else will work, however, so noticing the error requires looking
for it.
With a puppet_mutex with the same name declared in both classes, the catalog
will fail to compile so mistakes are easier to notice.Moreover, a declaration
with this define clearly expresses the intention that the two classes should
never both be declare.
Attempting to use the defined function to enforce exclusivity is unreliable,
as it is parse-order dependent and generally suggested against.
Parameters
None.
Variables
None.
Examples
To ensure that account::ldap and account::local cannot be both declared
at the same time, declare the same puppet_mutex in both classes.
class account::ldap {
puppet_mutex { 'user-account': }
}
class account::local {
puppet_mutex { 'user-account': }
}
Author
Wil Cooley <wcooley@nakedape.cc>
Copyright
Copyright 2014 Wil Cooley
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