Re: Autofs problem while using new nfs-utils package

[Chuck Lever <chuck.lever@oracle.com>]

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Michael Rayment wrote:
> I just emerged the latest gentoo release of the nfs-utils package, 
> nfs-utils-1.1.0-r1.ebuild.  I found that the autofs code did not work for my 
> diskless computers that have a readonly /etc directory with a /etc/mtab 
> symbolically linked to /proc/mounts.  This was because the creation of the 
> mtab lock file /etc/mtab~nnnn failed.  I noticed that in the update_mtab() 
> function, a check was put in to acertain whether this situation existed and 
> silently carried on whereas the add_mtab() function did not perform the check 
> and consequently failed.  My simple minded fix was to add the the same check 
> to add_mtab() as can be seen in the context diff below.  Automounting worked 
> fine after the fix was applied.   Hopefully some fix will make its way into 
> the authoratative release so that I do not have to patch my code locally.

At first blush, this seems reasonable to me.  I assume you copied this 
logic from util-linux's mount command.  Does the umount.nfs command also 
suffer from this problem?  If it does, you should include a hunk to fix 
that as well.

To submit a patch for inclusion in nfs-utils, add a patch description 
(parts of the above paragraph will work) and a Signed-off-by: line, and 
send all of this with your diff in a text e-mail to neilb@suse.de, cc: 
nfs@lists.sourceforge.net.

> *** utils/mount/mount.c.sav     Sat Oct  6 01:52:21 2007
> --- utils/mount/mount.c Sat Oct  6 01:55:25 2007
> ***************
> *** 181,188 ****
> --- 181,191 ----
>                 update_mtab(ment.mnt_dir, &ment);
>                 return 0;
>         }
> 
> +       if (mtab_does_not_exist() || !mtab_is_writable())
> +               return 0;
> +
>         lock_mtab();
> 
>           if ((mtab = setmntent(MOUNTED, "a+")) == NULL) {
>                 fprintf(stderr, "Can't open " MOUNTED);

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