Re: [PATCH v2 2/2] kvm tools: Add '--rootfs' and '--binsh'

[Asias He <asias.hejun@gmail.com>]

On 08/03/2011 02:46 AM, Sasha Levin wrote:
> This patch adds 2 new flags:
> 
>  --rootfs [path] - Specifies a path to use as rootfs. The path will be mounted
> using virtio-9p and booted from.
> Easiest way to test it is to mount the sample image we recommend with kvm tool
> (http://wiki.qemu.org/download/linux-0.2.img.bz2) and mounting it somewhere.
> *PLEASE DO NOT TRY BOOTING FROM YOUR REAL ROOT AKA '/', EVEN WITH READ ONLY
> SET* - Lets make sure the code is bulletproof before we delete your rootfs :)
> 
>  --binsh - This flag will boot into simple /bin/sh shell instead of going
> through /sbin/init. This is usefull for more complex distribution rootfs
> where we have to deal with /etc/fstab and such.
> 
> Signed-off-by: Sasha Levin <levinsasha928@gmail.com>

This is damn impressive!

All I needed is:

./kvm run -k /home/asias/qemu-stuff/bzImage --rootfs /mnt/


I found that if I boot with

./kvm run -k /home/asias/qemu-stuff/bzImage --rootfs /mnt/

I will get:

sh-2.05b# echo a > /root/a
sh: /root/a: No such file or directory

If I boot with

sudo ./kvm run -k /home/asias/qemu-stuff/bzImage --rootfs /mnt/

sh-2.05b# echo a > /root/a

works.

It seems that it is a permission related problem, however, the warning
message is "/root/a: No such file or directory", any ideas?

-- 
Best Regards,
Asias He