Re: Using wildcards in multi-mount maps

[Ian Kent <raven@themaw.net>]

On Mon, 2015-06-01 at 11:58 +0800, Ian Kent wrote:
> On Sun, 2015-05-31 at 20:05 +0200, Frank Thommen wrote:
> > Hi,
> > 
> > are wildcards within multi-mount maps supposed to work?
> 
> Good question.
> 
> > 
> > I have the following entry in our maps:
> > 
> > /etc/auto.master (local):
> >     /mymount yp:mymap --ghost
> > 
> > 
> > Indirect NIS map for /mymount:
> >     $ ypmatch webapps mymap
> >     /*         -timeo=30                   server:/local/exports/&
> 
> Yeah, that can't work.
> 
> The wildcard must be a single character at the start of the key, no
> other characters can be used.
> 
> So, no that can't be used in multi-mount map entries.
> 
> Keep in mind that for multi-mount map entries to work the offset paths
> must be known when the containing mount is performed so adding
> functionality like this isn't actually doable.
> 
> The substitution is based on replacing the whole key, autofs can't take
> part of a key and use it for substitution either.
> 
> What's more doing so would introduce the the need to handle multiple
> occurrences of the wildcard with matching of where to substitute each
> one and that isn't covered by the Sun map format AFAIK.
> 
> If this type of extended key pattern matching is really needed you could
> have a look at the amd map format. I haven't implemented the regex key
> matching functionality of am-utils in autofs but the variable length key
> matching combined with wildcard entries might be sufficient.

That probably should read "multiple component key matching" rather than
"variable length key matching".

> 
> Note that I also haven't implemented the am-utils multi-mount like map
> type either and the way they are specified in amd map format maps
> doesn't lend itself to this sort of wildcard handling either.
> 
> >     $
> > 
> > 
> > On the NIS server the map looks like this:
> >     webapps \
> >        /*         -timeo=30                   server:/local/exports/&

The other approach that might be useful is using submounts (Sun map
format) like:

webapps               -fstype=autofs autofs.wild

where autofs.wild could contain:
other-offset-submount             -fstype=autofs autofs.other-offsets
*          -timeo=30               server:/local/exports/&

and the map autofs.other-offsets is a subdirectory of lower level
mounts. Obviously you would need one of these for each sub directory of
mounts.

> > 
> > 
> > However on the client it looks like:
> > 
> >     $ ls /mymount/webapps
> >     *
> >     $ ls /mymount/webapps/user
> >     ls: /mymount/webapps/user: No such file or directory
> >     $
> > 
> > (/local/exports/user /is/ exported to this client from server)
> > 
> > This is on CentOS 5 with autofs 5.0.1.
> > 
> > Should that work or do I have to solve this mount config in an other way?
> > 
> > Frank
> > 
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