Puppet users - Apr 2009 - Installing crontabs and syncing files to temporary location

Is there a way to copy a source file to a temporary location? Or to
download a file by comparing it to a different file?  The problem I am
trying to solve is updating crontabs when the source file changes.
Our crontab files are checked into version control, synced by "file"
to a temp file, and applied with "crontab".  For various reasons, we
can''t use the cron type.

define crontab($host = $hostname) {
    $path = "/tmp/$name.$host.cron"
    remotefile { $path:
        source => "operations/cron/$host/$name.cron",
    }
    exec { "crontab-$name":
        command => "crontab -u $name $path",
        subscribe => File[$path],
        refreshonly => true,
    }
}

The problem is it compares the source file to the temp file. If is the
crontab is changed manually, this doesn''t notice.  In fact, it only
syncs when the temp file is deleted weekly by tmpwatch.  It should be
possible to compare the source file with /var/spool/cron/$name.  I
would prefer to use the "crontab" command to install  it which means
downloading to a temp file. I am guessing that the issue shows up with
other files that need to be installed with a command.

 - Ian

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What about something like this.



file { "/tmp/your_crontab_file":
    ensure => present,
    source => your_source,
    before => Correct_crontab[''ensure_correct_cron'']
}

correct_crontab { "ensure_correct_crontab": }

define correct_crontab {
    exec { "command you want to run":
        path ["/path/you/need/here"],
        unless => "`diff /tmp/your_crontab_file /etc/crontab >
/dev/null
2>&1`",
    }
}



It would put your cron source in a temp dir, and execute a command for
updating your crontab only if the crontab and the source is different.


Regards



2009/4/17 Ian Burrell <ianburrell@gmail.com>
>
> Is there a way to copy a source file to a temporary location? Or to
> download a file by comparing it to a different file?  The problem I am
> trying to solve is updating crontabs when the source file changes.
> Our crontab files are checked into version control, synced by
"file"
> to a temp file, and applied with "crontab".  For various reasons,
we
> can''t use the cron type.
>
> define crontab($host = $hostname) {
>    $path = "/tmp/$name.$host.cron"
>    remotefile { $path:
>        source => "operations/cron/$host/$name.cron",
>    }
>    exec { "crontab-$name":
>        command => "crontab -u $name $path",
>        subscribe => File[$path],
>        refreshonly => true,
>    }
> }
>
> The problem is it compares the source file to the temp file. If is the
> crontab is changed manually, this doesn''t notice.  In fact, it
only
> syncs when the temp file is deleted weekly by tmpwatch.  It should be
> possible to compare the source file with /var/spool/cron/$name.  I
> would prefer to use the "crontab" command to install  it which
means
> downloading to a temp file. I am guessing that the issue shows up with
> other files that need to be installed with a command.
>
>  - Ian
>
> >
>
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