Hi,
-a (--all) and -l (--lazy) are valid options and GNU getopt
reorders arguments (options first) so umount has seen
umount --all --lazy ls /mnt/
and because --all mode doesn't take any arguments, it ignored
'ls /mnt/'. Modifying this to error on extra args should be
trivial.
As for the command unmounting /proc when it should be ignored,
it is caused by umounting root dir with --lazy (MNT_DETACH)
option. See umount2(2).
Regards,
Václav Doležal
On 2019-06-04 at 13:51 Harald Dunkel wrote:
> Hi folks
>
> by accident I pasted
>
> umount ls -al /mnt/
>
> into bash. My bad. AFAICT /proc was umounted immediately, the
> rest died slowly. Don't try this at home.
>
> Point is, according to the man page this command line should
> have triggered an error message. "umount ls -al" doesn't make
> sense.
>
> Do you think the command line parser could be fixed?
>
> util-linux is version 2.29.2-1+deb9u1, as included in Debian.
> Of course I checked the diff for umount.c between 2.29 and
> 3.34-rc2. Apparently the getopt code has been improved, but I
> did not notice a fix for this particular problem.
>
>
> Thanx in advance. Keep on your good work
> Harri
