QEMU not booting my image Post: 302485230

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Special Forums Hardware Filesystems, Disks and Memory QEMU not booting my image Post 302485230 by fpmurphy on Tuesday 4th of January 2011 03:15:41 PM

01-04-2011

Registered User

Here is a basic script which builds a small image with just GRUB Legacy on it and uses QEMU to test if the image boots. It is for Fedora 14 X64. All you need to do is change GRUBFILEDIR to point to the directory containing your GRUB stage{1,2} files.

Code:

#!/bin/bash
#
#  Create a bootable image containing just Legacy Grub
#  and use QEMU to test boot it if requested
#

if (( $(id -u) != 0 ))
then
    echo "ERROR: This script must be run as root" 1>&2
    exit 1
fi

GRUBFILEDIR=/usr/share/grub/x86_64-redhat
IMAGE=myimage
LOOPDEV=$(/sbin/losetup -f)

dd if=/dev/zero of=${IMAGE}.img bs=512 count=2880

if [[ -d ${IMAGE} ]]
then
    rm -rf ${IMAGE}
fi
mkdir -p ${IMAGE}/boot/grub

cp ${GRUBFILEDIR}/stage1 ${IMAGE}/boot/grub
cp ${GRUBFILEDIR}/stage2 ${IMAGE}/boot/grub

/sbin/losetup ${LOOPDEV} ${IMAGE}.img
/sbin/mke2fs ${LOOPDEV}
mount ${LOOPDEV} -o loop /mnt
chmod 777 /mnt
cp -aR ${IMAGE}/* /mnt
umount /mnt
cat <<EOF | /sbin/grub --batch --device-map=/dev/null
device (fd0) ${LOOPDEV}
root (fd0)
setup (fd0)
quit
EOF

/sbin/losetup -d ${LOOPDEV}

read -n1 -p "Use QEMU to boot the image (Y/N) "
echo
if [[ $REPLY = [yY] ]]
then
    qemu  -fda ${IMAGE}.img
fi

exit 0

You can easily extend it to include a kernel and other binaries.

fpmurphy

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LEARN ABOUT DEBIAN

qemuctl

qemuctl(1)																qemuctl(1)

NAME

       qemuctl - Graphical control for qemu

SYNTAX

       qemuctl [-suspend-dir <dir>] [-suspend-file <filename>] [-qemu <qemu>]  [-nowakeup] qemu-options

DESCRIPTION

       qemuctl	is a gui that controls a qemu process with the built-in monitor of qemu. So you can change devices, suspend machines, save screen-
       shots, ...

       If you suspend a machine it will do the following macro:

       stop
       screendump "suspend-dir/suspend-file.ppm"
       savevm "suspend-dir/suspend-file.vm"
       commit
       quit

       You can afterwards resume the machine with:

       qemuctl -suspend-dir suspend-dir -suspend-file suspend-file your_qemu_options
       the suspend-files will then be deleted
       or
       qemuctl -loadvm suspend-dir/suspend-file.vm your_qemu_options

       Be aware that you can't use the "-monitor" option with qemuctl, because it needs the control over the monitor. The option  "-serial  stdio"
       can't be used, too.

OPTIONS

       -suspend-file <filename>
	      This  option  is	normaly  used by qemuctl to support suspend and wakeup. qemuctl can then find the vm-state-file in its folders and
	      wakeup the virtual machine. If the file is there the qemuctl waes up the virtual machine and deletes the file afterwards. On suspend
	      the  vm-state-file is then stored as the <filename> with the .vm ending and the screenshot is stored as the <filename> with the .ppm
	      ending.
	      Default filename is "suspend".

       -suspend-dir <dir>
	      This is the dir where the suspend files would be stored or expected.
	      Default is current dir.

       -nowakeup
	      Don't wake up even if the vm-file is there. Suspend still works.
	      Default is to wake up using the vm-file if it is there.

       -qemu <qemu>
	      The qemu variation to use. It can be qemu or kvm.
	      Default is qemu.

       qemu-options
	      Use qemu-options for the launch of qemu. See qemu(1) for further details.

FILES

       none

ENVIRONMENT VARIABLES

       none

EXAMPLES

       To use the suspend file 'Debian 3.1' and store/search it in the '/qemu' dir:

       qemuctl -suspend-file "Debian 3.1" -suspend-dir "/qemu" -boot c -hda hda.raw

       Alternativly you can run it with default suspend filenames:

       qemuctl -boot c -hda hda.raw

AUTHORS

       Peter Rustler

SEE ALSO

       qemu(1) qemu-launcher(1)

Peter Rustler							       0.0.1								qemuctl(1)