On Mon, 21 May 2007, Randall R Schulz wrote: > On Monday 21 May 2007 08:37, Steffen Winterfeldt wrote: > > ... > > > > Really cool users can show their advancedness by booting with (for > > example): > > > > insmod=vfat exec="mount /dev/sda1 /mnt ; dd if=/dev/zero of=/mnt/foo > > bs=1G count=1 ; mkswap /mnt/foo ; swapon /mnt/foo ; > > /usr/local/bin/umount -l /mnt" > > > > which does exactly what you want. :-) > > That's definitely cool, but I'd turn down the dd buffer size and > compensate by increasing the record count. If a buffer of the specified > size (bs= argument) cannot be allocated by dd, it will fail. (It's not > going to affect the speed unless the buffer size is ridiculously small, > since the whole thing is utterly I/O-bound.) Given that no swap is > available at the time, asking for a gigabyte would mean that many > users' systems would not be able to accommodate this request.
Granted. 'bs=1M count=1024' would be better. > Speaking of failure, you might want to replace the semicolons with > double ampersands, so the later commands only execute if the earlier > ones succeed. Bah! My commmands never fail. :-) > By the way, why attempt to unmount /mnt? Since there's now an open file > there, is it not guaranteed to fail? You need to get rid of it, because (a) yast uses /mnt and (b) yast might want to mount the partition itself. umount will not fail as '-l' makes a 'lazy' umount (unmounts no matter what). Steffen --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
