Puppet users - May 2008 - triggering exec after file transfer

Hello puppet-users,

my task is to roll-out an application archive and then (if the local
file is not present or has the wrong md5 sum)
to extract it (but only then!). Is the following code correct, I just
want to make sure that the extraction is triggered
by the file command.

        # transfer application archive
        file { "/var/adm/application_1_0.tar.gz" :
                source => "puppet://puppetmaster.xyz/
application_1_0.tar.gz",
                owner => root,
                group => root,
                mode => 755,
                checksum => md5
        }

        # extract archive
        exec { "/bin/zcat /var/adm/application_1_0.tar.gz | ( cd /opt;
tar xvf - )":
                cwd => "/root",
                path => ["/bin", "/usr/bin",
"/usr/sbin"],
                subscribe =>
File["/var/adm/application_1_0.tar.gz"],
                refreshonly => true
        }



thanks for your help
,
Stefan
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Hi Stefan,

using refreshonly prohibites execution until this element is notified. 
So using this would be correct:

        # extract archive
        exec { "/bin/zcat /var/adm/application_1_0.tar.gz | ( cd /opt; 
tar xvf - )":
                cwd => "/root",
                path => ["/bin", "/usr/bin",
"/usr/sbin"],
                subscribe =>
File["/var/adm/application_1_0.tar.gz"],
                refreshonly => true,
                alias => "extractapplication",             # just
for
some shortening the notify
        }

But to have the exec executed you need to notify it:
>         file { "/var/adm/application_1_0.tar.gz" :
>                 source => 
> "puppet://puppetmaster.xyz/application_1_0.tar.gz",
>                 owner => root,
>                 group => root,
>                 mode => 755,
>                 checksum => md5
>                 notify => Exec["extractapplication"],
>         }
>
hope this helps.

    Phillip

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On Friday 30 May 2008, Phillip Scholz wrote:
> Hi Stefan,
>
> using refreshonly prohibites execution until this element is notified.
> So using this would be correct:
>
>         # extract archive
>         exec { "/bin/zcat /var/adm/application_1_0.tar.gz | ( cd /opt;
> tar xvf - )":
>                 subscribe =>
File["/var/adm/application_1_0.tar.gz"],
>         }
>
> But to have the exec executed you need to notify it:
> >         file { "/var/adm/application_1_0.tar.gz" :
> >                 notify => Exec["extractapplication"],
The subscribe and the notify do exactly the same, only from different 
directions. Much worse IMHO is, that the tar will never delete file which are 
not present in the current version of the tarball but were in earlier ones.

Also, changing the version number will lead to maintenance headaches
("Where
else did I use this name?")



Regards, DavidS
- -- 
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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On 5/30/2008 9:47 AM, David Schmitt wrote:
> The subscribe and the notify do exactly the same, only from different
>  directions. Much worse IMHO is, that the tar will never delete file
> which are not present in the current version of the tarball but were
> in earlier ones.
Would it also filebucket the old .tar.gz files? That could be a hassle, too.

You might consider migrating to stow or native package management tools. 
I''ve got some writeups on that at the following:

- rsync, stow, and puppet: http://preview.tinyurl.com/3n5npl
- roll your own Debian packages: http://preview.tinyurl.com/4xpsbx
- roll your own Solaris packages: http://preview.tinyurl.com/3f73sc

-- 
Mike Renfro  / R&D Engineer, Center for Manufacturing Research,
931 372-3601 / Tennessee Technological University

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