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Description of problem:
The "mount --bind" option does not support the concept of having a read-only
copy, so NFS mounting localhost is the only way to acheive this.

Unfortunately autofs (mount_nfs.so) checks to see if a mount is local and then
uses the bind option if it is.

Below is a sample patch file to adjust this behaviour so that if the hostname is
"localhost" then it's taken to mean force an NFS mount rather than using bind.

Background: I have an area which gets rsync'd onto my machine (so I need it to
be writeable), but I want to present it to users as read only in general use as
a reminder that it's not the authoritative source. 

Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1. Create an autofs map with an entry like:  fred  -fstype=nfs  localhost:/usr/local
2. cd to the automount point (to get it mounted)
3. check the type of mount using "mount".
	

Actual Results:  You will see that the mount is done using the "bind" option.

Expected Results:  (my preferred approach)

The mount should have been completed using NFS, in that way any NFS specific
parameters to the mount command will be honoured (i.e. ro)

Additional info:

A simple patch file to do this is attached here (cut and paste may screw up the
space/tab arrangement, but it's simple enough to redo).

--- autofs-3.1.7/modules/mount_nfs.c    2002-10-31 09:26:47.000000000 +0000
+++ autofs-3.1.7/modules/mount_nfs.c    2002-10-31 09:29:06.000000000 +0000
@@ -107,6 +107,8 @@
               name, hostname);
        return 1;                       /* No such host */
       }
+      if( strcmp( hostname, "localhost" ) != 0 ) {
+       /* take this as an explicit request not to do "bind" */

       /* Probe to see if we are the local host.  Open a UDP socket and see
         if the local address is the same as the remote one */
@@ -138,6 +140,7 @@
          break;
        }
       }
+      } /* end of the localhost check */

       if ( paren )
        *paren = '(';