🚀 go-pugleaf

Mr. TANG (mktan4@cfs02.cc.monash.edu.au) wrote:

try this:
: /dev/hdb5                 /mnt/hd                   vfat   
defaults,umask=000 0 0

--
-- mark heath 	|	signature SPAMMED to avoid base 64
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It's 18 May 97  09:42,
We'll return to mktan4@cfs02.cc.monash.edu.au and All's
discussion of mount problem with vfat  [help]

 mk> I try mount the Win95 partition for any user in linux, but when I
 mk> setup the fstab, only the root user can write file to Win95 partition,
 mk> why ???? I have try vfat and msdos type in mount command, it had same
 mk> problem.

It's because (1) Vfat (and FAT for that matter) don't understand
permissions, so the system assigns the whole partition the same
owner and permissions, which usually owner being root, with permissions
755.  There is a way to change this (I can't remember the details, since
I only use ext2fs myself), but try reading the mount manpage or some
Linux docs.

Be very careful of giving your Win95 partitions 777 permissions! :-)

... maybe we're transmitting on Starfleet subspace relay?
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| Internet: tlang@freeway.DIALix.oz.au
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g@Elizabeth.netcraft.com.au (Geoffrey D. Bennett) writes:

> Manfred Bartz (mbartz@werple.net.au) wrote:
> : MS-VFAT does not support file permissions etc...
> 
> : You can mount a partition ``suid'' if you want to give permissions to
> : anyone who mounts the drive.
> 
> Don't you mean the 'umask' option?  suid means "Allow
> set-user-identifier or set-group-identifier bits to take effect."
> which is irrelevant since MS-VFAT does not support file permissions.

You are right.  What I wanted to achieve was that if a particular user
mounts the DOS drive, all files are owned by that user.  It turns out
that ``suid'' doesn't do anything.

> I do it like this:
> /dev/sdb1             /dos         msdos   umask=0 0 0
> 
> Or if you want to restrict access to certain users, create a group for
> them and use the gid option:
> /dev/sdb1             /dos         msdos   gid=70,umask=07 0 0

Very good.  I just took your example and implemented that.  :-)
So, the umask is the inverse of the permissions as used in chmod?

While on that topic, for the ext2-fs, I just discovered that I can
change my umask for the current session with umask -S mmm; very
useful.  UNIX (Linux) never ceases to amaze me!   :-)

> I don't see any point in using "user,noauto" for nonremovable media?

I use those partitions irregularly, unmounting them allows kerneld to
unload the VFAT and FAT support modules.  

> : All this is covered in the manpage for ``fstab''.
> 
> And 'mount'.
> 
> : I use a test editor to change ``fstab''. 
> : Challenge: Try doing this with the Redhat tools.  Is that possible?  Anyone?
> 
> Yes it is.

Surprise!  I couldn't figure it out when I tried Redhat V3.  

-- 
Manfred Bartz <mbartz@werple.net.au>
  --- LINUX, live free or die ---

"Mr. TANG" <mktan4@cfs02.cc.monash.edu.au> writes:

> 	I try mount the Win95 partition for any user in linux, but when I setup
> the fstab, only the root user can write file to Win95 partition, why
> ???? I have try vfat and msdos type in mount command, it had same
> problem.

MS-VFAT does not support file permissions etc...

You can mount a partition ``suid'' if you want to give permissions to
anyone who mounts the drive.

Here is my fstab:

# device        mount-dir  fs-type  options                 fs-freq  fs-pass
#                                   user,exec,dev,suid
#--------------+----------+--------+-----------------------+--------+-------

/dev/hdb1       /          ext2     defaults                 1        1
/dev/hdb4       /hdb4      ext2     user,noauto,ro           1        2
/dev/hda4       /hda4      ext2     defaults                 1        3

/dev/hda1       /dosc      vfat     user,noauto,rw,suid
/dev/hda2       /dosd      vfat     user,noauto,rw,suid

none            /proc      proc     defaults                 0        0

/dev/hda3       none       swap     sw                       0        0

/dev/fd0        /fd0       ext2     user,noauto              0        0
/dev/fd0        /dosa      vfat     user,noauto              0        0

/dev/hdc        /cdrom     auto     user,noauto,ro,exec      0        0

#--------------+----------+--------+-----------------------+--------+-------

any user can simply mount by:
    mount /dosc

Note that I can mount the floppy as a DOS floppy by:
    mount /dosa
and as a ext2 (Linux) floppy by:
    mount /fd0

All this is covered in the manpage for ``fstab''.

I use a test editor to change ``fstab''. 
Challenge: Try doing this with the Redhat tools.  Is that possible?  Anyone?

-- 
Manfred Bartz <mbartz@werple.net.au>
  --- LINUX, live free or die ---

Tony Langdon (tlang@freeway.DIALix.oz.au) wrote:

: Be very careful of giving your Win95 partitions 777 permissions! :-)

Why?  Its only Windows 95, no real loss if that operating system is 
corrupted by a careless user :-)

--
-- mark heath
Netspace Online Systems.  http://www.netspace.net.au/