Re: auto.net gets a key with a path under SLES9.

[Hans Deragon <hans@deragon.biz>]

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Ian Kent wrote:
> On Fri, 25 Nov 2005, Hans Deragon wrote:
> 
> 
>>Greetings.
>>
>>
>>  Well, I successfully reproduced the problem of a path sent to auto.net (see
>>below for full description).  Attached, the debug output on syslogd.  From
>>what I understand of the syslogd logs, the problem occurs before sun_mount()
>>is called.
>>
>>  What I did was:
>>
>>  cd /net/asterix  # Everything is ok.  $key=asterix
>>  cd asteris-07    # Bug:  $key=asterix/asterix-07
> 
> 
> Yes. Undoubtably the problem and that will be in the kernel module.
> 
> 
>>  What was passed to auto.net was asterix/asterix-07 at the second 'cd'.
> 
> 
> I would like to see the output of auto.net run manually and with the 
> incorrect key please.
> 
> Do you have access to the source for for the kernel you are using so that 
> we may check the patch levels?
> 
> Ian

Greetings Ian.


   Here is the output of auto.net.

[root@mysystem etc] auto.net asterix/asterix-07
/usr/sbin/showmount: can't get address for asterix/asterix-07
[root@mysystem etc] auto.net asterix
-fstype=nfs,hard,intr,nodev,nosuid \
         /asterix-00 asterix:/asterix-00 \
         /asterix-01 asterix:/asterix-01 \
         /asterix-02 asterix:/asterix-02 \
         /asterix-03 asterix:/asterix-03 \
         /asterix-04 asterix:/asterix-04 \
         /asterix-05 asterix:/asterix-05 \
         /asterix-06 asterix:/asterix-06

   Please note that in my previous email, when I reproduced
   the problem, I used a patched auto.net which would remove
   the path.  This is not the case above, since I wanted to
   reproduce the problem for you.

   This said, I just realized that the recursive path problem
   occurs when I try to 'cd' to an NFS share that does not
   exist (I have not realized this earlier; my bad).  For
   instance, with my patched auto.net,
   /net/asterix/asterix-07 mounts with the content of
   /net/asterix, which is wrong.  It should not mount.

   So I am starting to realize that maybe there is no bug...
   If I leave auto.net untouched, I do get the proper error,
   i.e.:

   [root@mysystem /net/asterix] cd asterix-07
   -bash: cd: asterix-07: No such file or directory

   Yet... I think that auto.net should not receive a path.
   So there might be a bug, but a minor one?

   I would need to find a case where a path is sent to
   auto.net when trying to access a valid NFS share.

   Attached, the auto.net, unpatched (actually, my patch is
   commented out).

   Also, I do have the kernel's source.


Best regards,
Hans Deragon
--
Consultant en informatique/Software Consultant
Deragon Informatique inc.
http://www.deragon.biz        Open source (contribution):
mailto://hans@deragon.biz     http://autopoweroff.deragon.biz

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#!/bin/bash

# $Id: auto.net,v 1.8 2005/04/05 13:02:09 raven Exp $

# This file must be executable to work! chmod 755!

# Look at what a host is exporting to determine what we can mount.
# This is very simple, but it appears to work surprisingly well

# Modified by Hans Deragon, 2005/10/26, 12:57 EDT
# key should be only the hostname, but for some reason, this
# script sometimes receives an NFS share in the form <hostname>/<path>,
# which is wrong.
#echo $1 >>/tmp/auto.net.out
#key=`echo $1 | perl -wp -e 's%^(\w+)(\/?.+)*$%$1%;'`
key=$1  # Original code

# add "nosymlink" here if you want to suppress symlinking local filesystems
# add "nonstrict" to make it OK for some filesystems to not mount
opts="-fstype=nfs,hard,intr,nodev,nosuid"

# Showmount comes in a number of names and varieties.  "showmount" is
# typically an older version which accepts the '--no-headers' flag
# but ignores it.  "kshowmount" is the newer version installed with knfsd,
# which both accepts and acts on the '--no-headers' flag.
#SHOWMOUNT="kshowmount --no-headers -e $key"
#SHOWMOUNT="showmount -e $key | tail -n +2"

for P in /bin /sbin /usr/bin /usr/sbin
do
	for M in showmount kshowmount
	do
		if [ -x $P/$M ]
		then
			SMNT=$P/$M
			break
		fi
	done
done

[ -x $SMNT ] || exit 1

# Newer distributions get this right
SHOWMOUNT="$SMNT --no-headers -e $key"

$SHOWMOUNT | LC_ALL=C sort +0 | \
	awk -v key="$key" -v opts="$opts" -- '
	BEGIN	{ ORS=""; first=1 }
		{ if (first) { print opts; first=0 }; print " \\\n\t" $1, key ":" $1 }
	END	{ if (!first) print "\n"; else exit 1 }
	'

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