Puppet users - Nov 2007 - A more elegant way of obtaining the major OS release number

Hello all:
> 	We operate in an environment where we might sometimes wish to do
> certain tasks based solely upon the MAJOR version number of an OS
> release, disregarding the minor portion of the version number. For
> instance, CentOS 4.0 through 4.5 would all be ''CentOS 4''
to some
> scripts, and CentOS 5.0 and greater would all be ''CentOS
5''.
> 
> 	I slightly modified facter (via editing
> /usr/lib/site_ruby/1.8/facter.rb) to expose a new variable named
> lsbdistrelease_majorversion which only includes the portion of the LSB
> distribution release before the decimal point (if there is a point at
> all):
> 
> =======> 621c621,622
> <         {   "LSBRelease" => %r{^LSB Version:\t(.*)$},
> ---
> >         {
> >             "LSBRelease" => %r{^LSB Version:\t(.*)$},
> 623a625
> >             "LSBDistRelease_MajorVersion" =>
> %r{^Release:\t([0-9]+)},
> ======> 
> However, this seems like a rather unelegant, non-standard solution,
> and it''s Linux-specific!
> 
> Can you think of any way in which one might distinguish between, say,
> ''Solaris 7'' and ''Solaris 8'', without
caring if it''s 7.1 or 7.2 or 7.3
> within ''7''... or ''CentOS 4'' without
distinguishing between 4.0 or 4.5?
> 
> Any feedback you could provide along these lines would be very much
> appreciated. I can''t seem to find a way to do something like:
> 
> ==============================> class osdep-helloworld {
>     file { "/etc/helloworld":
>         owner => root,
>         group => root,
>         mode => 443,
>         source => $lsbdistrelease ? {
>                 >=4 =>
> "puppet://puppetmaster.1515.mtvi.com/dist/apps/misc/helloworld-centos-
> 4",
>                 >=5 =>
> "puppet://puppetmaster.1515.mtvi.com/dist/apps/misc/helloworld-centos-
> 5",
>                 }
>     }
> }
> ==============================> 
> Instead, I''d have to do a kluge like this:
> 
> 
> ==============================> class osdep-helloworld {
>     file { "/etc/helloworld":
>         owner => root,
>         group => root,
>         mode => 456,
>         source => $lsbdistrelease ? {
>                 "4.0" =>
> "puppet://puppetmaster.1515.mtvi.com/dist/apps/misc/helloworld-centos-
> 4",
>                 "4.1" =>
> "puppet://puppetmaster.1515.mtvi.com/dist/apps/misc/helloworld-centos-
> 4",
>                 "4.2" =>
> "puppet://puppetmaster.1515.mtvi.com/dist/apps/misc/helloworld-centos-
> 4",
>                 "4.3" =>
> "puppet://puppetmaster.1515.mtvi.com/dist/apps/misc/helloworld-centos-
> 4",
>                 "4.4" =>
> "puppet://puppetmaster.1515.mtvi.com/dist/apps/misc/helloworld-centos-
> 4",
>                 "4.5" =>
> "puppet://puppetmaster.1515.mtvi.com/dist/apps/misc/helloworld-centos-
> 4",
>                 "5" =>
> "puppet://puppetmaster.1515.mtvi.com/dist/apps/misc/helloworld-centos-
> 5",
>                 }
>     }
> }
> ==============================> 
> Or, of course, use my modification to facter.
> 
> I eagerly await any helpful hints you might be able to offer.
> 
> Many thanks,
> 
> --Jessica

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On Wednesday 07 November 2007, Blank, Jessica wrote:
> Hello all:
> > 	We operate in an environment where we might sometimes wish to do
> > certain tasks based solely upon the MAJOR version number of an OS
> > release, disregarding the minor portion of the version number. For
> > instance, CentOS 4.0 through 4.5 would all be ''CentOS
4'' to some
> > scripts, and CentOS 5.0 and greater would all be ''CentOS
5''.
> >
> > I eagerly await any helpful hints you might be able to offer.
You could write yourself a function which munges the value as needed.

See the wiki on "WritingYourOwnFunctions" or the functions in my repo
at
http://git.black.co.at/?p=manifests.git;a=tree;f=modules/common/plugins/puppet/parser/functions;hb=HEAD
.
Especially the gsub function might be of use to you.

Regards, David

- -- 
The primary freedom of open source is not the freedom from cost, but the free-
dom to shape software to do what you want. This freedom is /never/ exercised
without cost, but is available /at all/ only by accepting the very different
costs associated with open source, costs not in money, but in time and effort.
- -- http://www.schierer.org/~luke/log/20070710-1129/on-forks-and-forking
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