Puppet users - Nov 2008 - existence test inside a selector ?

I was wondering if it is possible to do a conditional inside a selector to
test for the existence of a file.

I currently have something like this (just an excerpt):

    file {
        smbshares:
            path => "/etc/samba/shares.conf",
            source => $hostname ? {
                nodename1 =>
"puppet:///samba/shares/nodename1.conf",
                nodename2 =>
"puppet:///samba/shares/nodename2.conf",
                default => "puppet:///samba/shares/default.conf",
            };
      }

The smb.conf does an include on /etc/samba/shares.conf so in order to add or
create custom shares I drop a file in modules/samba/files/shares named after
the hostname of the target machine and then place the corresonding line in
the file block above. It works pretty well, but since the file is named
after the hostname I was thinking it would be pretty slick if that part were
a little more dynamic.

Logically speaking it would look something like this:

            source => $hostname ? {
                [ -f puppet:///samba/shares/$hostname.conf ] =>
"puppet:///samba/shares/$hostname.conf",
                default => "puppet:///samba/shares/default.conf",
            };

I just can''t quite seem to come up with what the syntax would need to
look.
The shell syntax above is just to convey the logic I''m looking for.

Any ideas, or is there a better way to do this?

Thanks.

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Robert Foreman wrote:
> Logically speaking it would look something like this:
> 
>             source => $hostname ? {
>                 [ -f puppet:///samba/shares/$hostname.conf ] => 
> "puppet:///samba/shares/$hostname.conf",
>                 default =>
"puppet:///samba/shares/default.conf",
>             };
> 
> I just can''t quite seem to come up with what the syntax would need
to
> look. The shell syntax above is just to convey the logic I''m
looking for.
> 
> Any ideas, or is there a better way to do this?
You need to read the documentation for the source parameter of the file type.
It already supports what you want to do.


	/Thomas Bellman

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Found it. Thanks. I thought I had read something like that somewhere, but I
got hung with using a selector.

file { "/path/to/my/file":
    source => [
        "/nfs/files/file.$host",
        "/nfs/files/file.$operatingsystem",
        "/nfs/files/file"
    ]
}


On Wed, Nov 19, 2008 at 9:01 AM, Thomas Bellman <bellman@nsc.liu.se>
wrote:
>
> Robert Foreman wrote:
>
> > Logically speaking it would look something like this:
> >
> >             source => $hostname ? {
> >                 [ -f puppet:///samba/shares/$hostname.conf ] =>
> > "puppet:///samba/shares/$hostname.conf",
> >                 default =>
"puppet:///samba/shares/default.conf",
> >             };
> >
> > I just can''t quite seem to come up with what the syntax would
need to
> > look. The shell syntax above is just to convey the logic I''m
looking for.
> >
> > Any ideas, or is there a better way to do this?
>
> You need to read the documentation for the source parameter of the file
> type.
> It already supports what you want to do.
>
>
>        /Thomas Bellman
>
> >
>
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hi Robert,

I''m only new to puppet so I''m not sure if this is what you are
after but
would the folowing work?

    file {
        smbshares:
            path => "/etc/samba/shares.conf",
            source => $hostname ? {
                nodename1 =>
["puppet:///samba/shares/nodename1.conf",
"puppet:///samba/shares/default.conf"],
                nodename2 =>
["puppet:///samba/shares/nodename2.conf",
"puppet:///samba/shares/default.conf"],
                default => "puppet:///samba/shares/default.conf",
            };
      }

This way it would check for the file called nodename1.conf then failing
that it would look for the default.

Cheers,

Henry



Robert Foreman wrote:
> I was wondering if it is possible to do a conditional inside a selector
to test for the existence of a file.
>
> I currently have something like this (just an excerpt):
>
>     file {
>         smbshares:
>             path => "/etc/samba/shares.conf",
>             source => $hostname ? {
>                 nodename1 =>
"puppet:///samba/shares/nodename1.conf",
>                 nodename2 =>
"puppet:///samba/shares/nodename2.conf",
>                 default =>
"puppet:///samba/shares/default.conf",
>             };
>       }
>
> The smb.conf does an include on /etc/samba/shares.conf so in order to
add or create custom shares I drop a file in modules/samba/files/shares
named after the hostname of the target machine and then place the
corresonding line in the file block above. It works pretty well, but
since the file is named after the hostname I was thinking it would be
pretty slick if that part were a little more dynamic.
>
> Logically speaking it would look something like this:
>
>             source => $hostname ? {
>                 [ -f puppet:///samba/shares/$hostname.conf ] =>
"puppet:///samba/shares/$hostname.conf",
>                 default =>
"puppet:///samba/shares/default.conf",
>             };
>
> I just can''t quite seem to come up with what the syntax would need
to
look. The shell syntax above is just to convey the logic I''m looking
for.
>
> Any ideas, or is there a better way to do this?
>
> Thanks.
>
>
>
> >
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I don''t know if that would work or not, but it turns out I was over
complicating things. All I needed to do was this:

    file {
        smbshares:
            path => "/etc/samba/shares.conf",
            source => [
                "puppet:///samba/shares/$hostname.conf",
                "puppet:///samba/shares/default.conf",
            ];
    }

As Thomas Bellman pointed out the file type already supports this. If you
specify multiple file sources for a file then the first source that exists
will be used.

On Thu, Nov 20, 2008 at 3:14 AM, Henry Jenkins
<henry@henryjenkins.name>wrote:
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Hi Robert,
>
> I''m only new to puppet so I''m not sure if this is what
you are after but
> would the folowing work?
>
>    file {
>        smbshares:
>            path => "/etc/samba/shares.conf",
>            source => $hostname ? {
>                nodename1 =>
["puppet:///samba/shares/nodename1.conf",
> "puppet:///samba/shares/default.conf"],
>                 nodename2 =>
["puppet:///samba/shares/nodename2.conf",
> "puppet:///samba/shares/default.conf"],
>                 default =>
"puppet:///samba/shares/default.conf",
>            };
>      }
>
> This way it would check for the file called nodename1.conf then failing
> that it would look for the default.
>
> Cheers,
>
> Henry
>
>
>
> Robert Foreman wrote:
> > I was wondering if it is possible to do a conditional inside a
selector
> to test for the existence of a file.
> >
> > I currently have something like this (just an excerpt):
> >
> >     file {
> >         smbshares:
> >             path => "/etc/samba/shares.conf",
> >             source => $hostname ? {
> >                 nodename1 =>
"puppet:///samba/shares/nodename1.conf",
> >                 nodename2 =>
"puppet:///samba/shares/nodename2.conf",
> >                 default =>
"puppet:///samba/shares/default.conf",
> >             };
> >       }
> >
> > The smb.conf does an include on /etc/samba/shares.conf so in order to
> add or create custom shares I drop a file in modules/samba/files/shares
> named after the hostname of the target machine and then place the
> corresonding line in the file block above. It works pretty well, but
> since the file is named after the hostname I was thinking it would be
> pretty slick if that part were a little more dynamic.
> >
> > Logically speaking it would look something like this:
> >
> >             source => $hostname ? {
> >                 [ -f puppet:///samba/shares/$hostname.conf ] =>
> "puppet:///samba/shares/$hostname.conf",
> >                 default =>
"puppet:///samba/shares/default.conf",
> >             };
> >
> > I just can''t quite seem to come up with what the syntax would
need to
> look. The shell syntax above is just to convey the logic I''m
looking for.
> >
> > Any ideas, or is there a better way to do this?
> >
> > Thanks.
> >
> >
> >
> > >
>
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> Version: GnuPG v1.4.9 (GNU/Linux)
> Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org
>
> iEYEARECAAYFAkklHGQACgkQ9EJQnSAhy1AEoACePEs2hSThFwEueT+tiPc/eU5I
> vI8AnAp8WfYO+XURwHfs0rQU2DvQRB/p
> =b+ea
> -----END PGP SIGNATURE-----
>
>
> >
>
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