Re: [Qemu-devel] Login a guest use commandline

[Martin Koniczek]

zheng sw wrote:
> when I run the command in bash:
> "sudo qemu -hda testaa.img -boot c -localtime -serial stdio -pidfile
> pidfile1.txt && sleep 300 && root && 123456 && ifconfig"
>
> root is the guest's user, 123456 is password,
> Why can't I login in the guest and run the ifconfig? and run

you intend to queue commands to be executed within the qemu guest?

&& is not suitable for "entering commands", it is a sh/bash control 
operator (which executes whatever comes after && if the previous command 
returned true, read "man bash" to learn more about this)

furthermore, what you intent to do seems to rely on a linux guest kernel 
where kernel console (and login shell like agetty) is redirected to 
ttyS0, so make sure your guests kernel configuration and /etc/inittab 
are set up properly.

but even if you "correctly" pipe commands to your linux guest, i doubt 
you get the results you want - agetty clears any stdinput before the 
password prompt etc, so you'd need an "interactive" script to parse 
stdin and generate stdout (from remote controls script view), for 
example "expect", see "man expect"

and if you expect to interact on the serial console after your "startup 
commands", you would be lost with classical piping anyway. perhaps 
screen helps you there? see "man screen"

if what you showed in your example is really what you want to to, how 
about a simple script within the guest executed in the end of the 
startup process, which shows you the current ifconfig? (see your guests 
/etc/rc* scripts for that)

running sshd in the guest and queing commans via ssh is of course the 
most stable (and not-qemu-specific) solution, but required correctly 
set-up networking between guest and qemu.

sincerly,
        martin koniczek