[no subject]

Geoffrey wrote:
> Dow Hurst wrote:
> 
>> I was reading thru all the posts on this and you have basically a 
>> couple of problems working together.
>>
>> Vfat doesn't have permissions like normal Linux filesystems.  So you 
>> can't change the permissions on files from the vfat default of anyone 
>> reading and writing any files.
>>
>> Your device file permissions were initially set so only root could 
>> access the device.  That way your normal user id wouldn't be able to 
>> write to the drive.
>>
>> So, if you have to use the zip as a transfer between Win/DOS and 
>> Linux, then you should keep the filesystem as is, and just leave your 
>> device file that represents the zip drive as writeable for root.  Su 
>> to root to mount, transfer files, and unmount the zip.
> 
> 
> You really don't have to do this.  I mount my memory stick which has 
> vfat fs by any user.  Relevant entry in /etc/fstab:
> 
> /dev/sda1 /mnt/memstick vfat noauto,user,exec 0 0
> 
> The 'user' option permits any user to mount the file system.
> 
> Once it's mounted, I can create files as well as directories on 
> /mnt/memstick as the user who mounted the filesystem.
> 
>> If you move to the new 2.6 kernel then all the mount and umount stuff 
>> goes away for removeable devices.  Plus, with permissions on the 
>> devices set correctly by the kernel for removeable devices you can 
>> work as a user.  I need to read up on that last statement but SuSE 9.1 
>> was a dream for the use of CD's and floppies when I was trying it out.
>>
>> Using mtools is a nice idea since it is designed to work with vfat.  
>> The unix cp -p command won't work like you'd expect since you don't 
>> have ownership or permissions per se under vfat.  I believe the kernel 
>> just calls all the files and directories as owned by root unless you 
>> have it mounted as nobody.
> 
> 
> Not exactly.  If you can create a file on the mounted file system, it is 
> created as owned by the user who created it:
> 
> rhws/mnt/memstick> ls -lart
> total 52
> -r-xr-xr-x    1 esoteric users           0 Jul 16  2003 memstick.ind
> drwxr-xr-x    6 root     root         4096 Jun 29 07:45 ..
> drwxr-xr-x    2 esoteric users       16384 Jun 30 13:48 foo
> drwxr-xr-x    4 esoteric users       16384 Jun 30 13:48 .
> 
>> The underlying mount point permissions are very important to match up 
>> with what your filesystem has that will be mounted.  You can't see 
>> those permissions on the mount point unless the filesystem isn't 
>> mounted yet on that mount point.
> 
> 
> This isn't accurate either, sorry Dow. :)
> 
> /mnt/memstick on my box was 755 and I can mount it and created/delete 
> files or directories.  As root, I changed the perms of /mnt/memstick to 
> 700.  I'm still able to mount the filesystem as well as create/delete 
> files and directories.
> 
> Note the following:
> 
> root at rhws/home/esoteric> ls -ld /mnt/memstick
> drwx------    2 root     root         4096 May 12 13:59 /mnt/memstick
> root at rhws/home/esoteric> exit
> exit
> rhws/home/esoteric> mount /mnt/memstick
> rhws/home/esoteric> ls -ld /mnt/memstick
> drwxr-xr-x    3 esoteric users       16384 Dec 31  1969 /mnt/memstick
> 
>> This bites people using NFS, such as me, when you have the mount point 
>> with 0700 permissions but expect to have 0755 on the mounted 
>> filesystem.  The mounted filesystem's permissions hide and overlay the 
>> underlying mount point's permissions when mounted so you'd have to 
>> unmount to check and see what the values were.
> 
> 
> I've not tried this for NFS, so I'm not sure what happens there.
> 

-- 
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Dow Hurst                  Office: 770-499-3428            *
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Kennesaw State University         Dow.Hurst at mindspring.com *
Kennesaw, GA 30144                                         *
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<li><strong><a name="00703" href="msg00703.html">[ale] Permission hell question</a></strong>
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<li><strong><a name="00687" href="msg00687.html">[ale] Permission hell question</a></strong>
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