Puppet users - Oct 2012 - Is the assignment of variables executed before the package resource?

Hi, all
I''m confused about the execution sequence in puppet.
*The background:*
*   * I want to get mysql package version after installing it with the 
Package resource. And I''ll configure /etc/my.cnf according the version
of
mysql package. The code is as following.
    -----------------------------------------------    
    class mysql{
        package { "mysql":
           ensure => latest,
        }
  
        $mysql_version = get_pkg_version("mysql")

        file { ''/etc/my.cnf'':
             ensure => present,
             content => template(''mysql/mysql.cnf''),
             require => Package["mysql"],
         }
    }
    -----------------------------
   Note: get_pkg_version is a user defined function written by me. It can 
get mysql rpm version when mysql is installed.

*Issue:*
    First time I executed *puppet agent -t, *the variable
*mysql_version*didn''t get the value of mysql rpm version.
    But the second time, after mysql is installed. *mysql_version* can 
get the value of mysql rpm version. 

Can anyone help me with the problem? 


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Hi,

the function is executed on the puppet master at the time of compiling 
the catalog.

The catalog is then transferred to the agent where all resources are 
applied.

Depending on your setup this might not only be two different stages in 
the process, but also two different machines!

This is explained in more depth here:
> http://docs.puppetlabs.com/learning/manifests.html

Best Regards, David

On 23.10.2012 11:09, Apple Wang wrote:
> Hi, all
> I''m confused about the execution sequence in puppet.
> *The background:*
> ** I want to get mysql package version after installing it with the
> Package resource. And I''ll configure /etc/my.cnf according the
version
> of mysql package. The code is as following.
>      -----------------------------------------------
>      class mysql{
>          package { "mysql":
>             ensure => latest,
>          }
>          $mysql_version = get_pkg_version("mysql")
>
>          file { ''/etc/my.cnf'':
>               ensure => present,
>               content => template(''mysql/mysql.cnf''),
>               require => Package["mysql"],
>           }
>      }
>      -----------------------------
>     Note: get_pkg_version is a user defined function written by me. It
> can get mysql rpm version when mysql is installed.
>
> *Issue:*
>      First time I executed /*puppet agent -t*, /the variable
> */mysql_version/* didn''t get the value of mysql rpm version.
>      But the second time, after mysql is installed.
> */mysql_version/* can get the value of mysql rpm version.
>
> Can anyone help me with the problem?
>
>
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Hi, David

Thanks for your reply. I have been more clear about the compiling of puppet.
Do you have any good method to get the package version after installing if 
with Package resource? I need the version to configure the my.cnf file.

I know a method to get the version of packages that already installed, 
which are as follows.

Puppet::Parser::Functions::newfunction(:get_pkg_version, :type => :rvalue) 
do |args|
  pkg_name = args[0]
  pkg = Puppet::Type.type(:package).new(:name => pkg_name)
  version = pkg.retrieve[pkg.property(:ensure)].to_s
  version.split(/-|\+/).at 0
end

But is there any function of Package type that can get the latest version 
in the software repository (e.g. yum or zypper)? So that I can get the 
version of a package which will be installed and configure its conf file.

Really looking forward for your answer!

Thanks
Apple

在 2012年10月23日星期二UTC+8下午10时49分03秒，David Schmitt写道：
>
> Hi, 
>
> the function is executed on the puppet master at the time of compiling 
> the catalog. 
>
> The catalog is then transferred to the agent where all resources are 
> applied. 
>
> Depending on your setup this might not only be two different stages in 
> the process, but also two different machines! 
>
> This is explained in more depth here: 
>
> > http://docs.puppetlabs.com/learning/manifests.html 
>
>
> Best Regards, David 
>
> On 23.10.2012 11:09, Apple Wang wrote: 
> > Hi, all 
> > I''m confused about the execution sequence in puppet. 
> > *The background:* 
> > ** I want to get mysql package version after installing it with the 
> > Package resource. And I''ll configure /etc/my.cnf according
the version
> > of mysql package. The code is as following. 
> >      ----------------------------------------------- 
> >      class mysql{ 
> >          package { "mysql": 
> >             ensure => latest, 
> >          } 
> >          $mysql_version = get_pkg_version("mysql") 
> > 
> >          file { ''/etc/my.cnf'': 
> >               ensure => present, 
> >               content =>
template(''mysql/mysql.cnf''),
> >               require => Package["mysql"], 
> >           } 
> >      } 
> >      ----------------------------- 
> >     Note: get_pkg_version is a user defined function written by me. It
> > can get mysql rpm version when mysql is installed. 
> > 
> > *Issue:* 
> >      First time I executed /*puppet agent -t*, /the variable 
> > */mysql_version/* didn''t get the value of mysql rpm version. 
> >      But the second time, after mysql is installed. 
> > */mysql_version/* can get the value of mysql rpm version. 
> > 
> > Can anyone help me with the problem? 
> > 
> > 
> > -- 
> > You received this message because you are subscribed to the Google 
> > Groups "Puppet Users" group. 
> > To view this discussion on the web visit 
> > https://groups.google.com/d/msg/puppet-users/-/4uL89crPzDsJ. 
> > To post to this group, send email to
puppet...@googlegroups.com<javascript:>.
>
> > To unsubscribe from this group, send email to 
> > puppet-users...@googlegroups.com <javascript:>. 
> > For more options, visit this group at 
> > http://groups.google.com/group/puppet-users?hl=en. 
>
>
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On Tuesday, October 23, 2012 11:44:36 AM UTC-5, Apple Wang
wrote:
>
> Hi, David
>
> Thanks for your reply. I have been more clear about the compiling of 
> puppet.
> Do you have any good method to get the package version after installing if 
> with Package resource? I need the version to configure the my.cnf file.
>
> I know a method to get the version of packages that already installed, 
> which are as follows.
>
> Puppet::Parser::Functions::newfunction(:get_pkg_version, :type =>
:rvalue)
> do |args|
>   pkg_name = args[0]
>   pkg = Puppet::Type.type(:package).new(:name => pkg_name)
>   version = pkg.retrieve[pkg.property(:ensure)].to_s
>   version.split(/-|\+/).at 0
> end
>
>
I am pretty sure that doesn''t do anything like what you are looking
for.
In particular, because functions run *on the master*, it is incapable of 
telling you anything about the current state of the client (except when the 
client is the master itself).  It looks like that might give you the value 
of the ''ensure'' property that you specify in your manifests
for the Package
resource of interest.  If you ''ensure'' a specific version and
your catalog
is applied successfully, then that is indeed the version that the client 
will have after the Puppet run.  In that case you would already know the 
version number to expect, however, so you wouldn''t need to query it. 
If
you specify something like "ensure => ''latest''",
however, or if you don''t
give an explicit ensure at all, then that function isn''t even going to 
return a number.

 
> But is there any function of Package type that can get the latest version 
> in the software repository (e.g. yum or zypper)? So that I can get the 
> version of a package which will be installed and configure its conf file.
>
>
Now that''s an entirely different question.  Supposing that you can rely
on
the master''s repository configuration to be the same as the
client''s, you
can write a custom function that runs "yum list <packagename>"
and parses
the version number out of the result.

Really, though, I suspect you''re going about this in an unnecessarily 
difficult way.  Why does the version number of the software need to be 
recorded in the software''s own configuration file?  That seems
redundant
and brittle.  Isn''t there an alternative that would Just Work?


John

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