Using wildcards in multi-mount maps

Using wildcards in multi-mount maps

[Frank Thommen]

Hi,

are wildcards within multi-mount maps supposed to work?

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/&
    $


On the NIS server the map looks like this:
    webapps \
       /*         -timeo=30                   server:/local/exports/&


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

Re: Using wildcards in multi-mount maps

[Ian Kent]

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.

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/&
> 
> 
> 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
> 
> --
> To unsubscribe from this list: send the line "unsubscribe autofs" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: Using wildcards in multi-mount maps

[Ian Kent]

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
> > 
> > --
> > To unsubscribe from this list: send the line "unsubscribe autofs" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 
> 
> --
> To unsubscribe from this list: send the line "unsubscribe autofs" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: Using wildcards in multi-mount maps

[Frank Thommen]

On 06/01/2015 06:10 AM, Ian Kent wrote:
> 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 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.

Solved it this way.  Thanks a lot
Frank