[lug] Permission denied attempting to run setiathome

[D. Stimits]

Franklin Bowen wrote:
> Unix oldie but Linux newbie and I'm obviously missing something.
> 
> I think it's a vfat issue because I moved the executable to /root, chmod u+x 
> and it runs.  But I can't chmod +x the executable on the vfat partition (I 
> assume due to vfat limitations).  I can write to this directory because I 
> extracted setiathome from the .tar file.

vfat doesn't support permissions (or security for that matter). You can 
mount a vfat partition and all files are owned and chmod by a fixed 
rule. You can alter who it is mounted as, and the umask, at the time of 
mounting. For example, the following would make user ID (see /etc/passwd 
for who an ID belongs to) 1234 and group ID 2468 on /mnt/public/ if hda1 
is the partition (and public would have read/exec perms, but only owner 
would have write perms):
  mount -t vfat -ouid=1234,gid=2468,umask=7022 /dev/hda1 /mnt/public

You could leave it as owned by root, and set the umask and it could then 
be readable.

D. Stimits, stimits AT attbi.com

> 
> Help!  I want to get my CPU cycles doing something useful while I learn about 
> and configure everything.  Thanks!
> 
> 
> [root at slowasmud SETI at home]# ./setiathome
> bash: ./setiathome: Permission denied
> 
> [root at slowasmud SETI at home]# pwd
> /mnt/E/SETI at home
> 
> [root at slowasmud SETI at home]# ls -la
> drwxr-xr-x    2 fbowen   users       32768 Sep 11 09:18 .
> drwxr-xr-x   16 fbowen   users       16384 Dec 31  1969 ..
> -r--r--r--    1 fbowen   users      362012 Sep 11 09:18 setiathome
> -rw-r--r--    1 fbowen   users      131000 Sep 11 08:23 setiathomeSharedLibs
> 
> [root at slowasmud SETI at home]# df -T
> Filesystem    Type   1k-blocks      Used Available Use% Mounted on
> /dev/hda1     vfat     2096160   1434688    661472  69% /mnt/E
> 
> [root at slowasmud root]# cat /etc/fstab
> /dev/hda1                /mnt/E             auto    auto,users 0 0
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