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wrapper script for starting Qemu VMs
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| #!/usr/bin/env bash | |
| # author: Florian Staudacher | |
| ### | |
| # Usage: | |
| # ./start.sh | |
| # uses the configured base image, creates an overlay (if set) and starts | |
| # the VM. The overlay will be discarded at the end (you will have the | |
| # possibility to make a copy before it is deleted). | |
| # | |
| # ./start.sh os_image.qcow2 | |
| # uses the given image as base image, creates an overlay (if set) and starts | |
| # the VM. The overlay will be discarded (you may also keep it by copying it | |
| # somewhere when prompted). | |
| ### | |
| ################################################################################ | |
| ## CONFIG ------------------------------------------------------------------## | |
| ################################################################################ | |
| # point this to a cdrom .img if you want to use one | |
| # | |
| # EXAMPLE: | |
| # VM_CDROM="my_cdrom.iso" | |
| # | |
| VM_CDROM="" | |
| # point this to a local path in your filesystem to get it as SMB share in the | |
| # guest OS. It should then be reachable under "\\10.0.2.4\qemu". | |
| # for more info on qemu SLIRP networking, see: | |
| # http://wiki.qemu.org/Documentation/Networking#User_Networking_.28SLIRP.29 | |
| # | |
| # NOTE: this requires an installed samba server on the host OS, also qemu | |
| # will have to be run as root, otherwise the samba server won't start. | |
| # There was a change in recent samba versions, so this will only work with | |
| # samba < 4.0 - in that case, you have to configure and start samba yourself. | |
| # see: http://bugs.debian.org/727756 | |
| # | |
| # EXAMPLE: | |
| # VM_SMB_SHARE="/home/user/share" | |
| # | |
| VM_SMB_SHARE="" | |
| # set the amount of memory used for the VM (in MB) | |
| VM_MEMORY="768" | |
| # set the name of the used VM (base) image | |
| # this can also be a previously created overlay image | |
| VM_IMAGE="root_image.qcow2" | |
| # set a port forwarding from the host OS to the VM | |
| # this only applies if "user networking" is used (which this script does) | |
| # | |
| # EXAMPLE: | |
| # VM_FWD_PORT="1234::80" | |
| # | |
| VM_FWD_PORT="10022::22" | |
| # specify if you want to use a temporary overlay image to leave the original | |
| # VM image untouched. The overlay image will be deleted after shutdown. | |
| # To make permanent changes to the base image, don't use an overlay... | |
| # | |
| # EXAMPLE: | |
| # USE_OVERLAY=0 | |
| USE_OVERLAY=1 | |
| ################################################################################ | |
| VM_USED_IMAGE="$VM_IMAGE" | |
| REL_SCRIPT_PATH="`dirname \"$0\"`" | |
| SCRIPT_PATH="`(cd \"$REL_SCRIPT_PATH\" && pwd )`" | |
| TEMPNAME=`mktemp -u --suffix ".qcow2" "$SCRIPT_PATH/tmp.XXXXX"` | |
| if [ -n "$1" ]; then | |
| VM_USED_IMAGE="$1" | |
| fi | |
| if [ "$USE_OVERLAY" -eq 1 ]; then | |
| qemu-img create -b "$VM_USED_IMAGE" -f qcow2 "$TEMPNAME" | |
| VM_USED_IMAGE="$TEMPNAME" | |
| printf "using temporary overlay image: %s\n" "$TEMPNAME" | |
| fi | |
| VM_CDROM_CMD="" | |
| if [ -n "$VM_CDROM" ]; then | |
| VM_CDROM_CMD="-cdrom $VM_CDROM" | |
| fi | |
| VM_SMB_CMD="" | |
| if [ -n "$VM_SMB_SHARE" ]; then | |
| VM_SMB_CMD=',smb=' | |
| VM_SMB_CMD+="$VM_SMB_SHARE" | |
| fi | |
| VM_PORTFWD_CMD="" | |
| if [ -n "$VM_FWD_PORT" ]; then | |
| VM_PORTFWD_CMD="-redir tcp:$VM_FWD_PORT" | |
| fi | |
| # check kernel word length | |
| QEMU_CMD="qemu-system" | |
| case `uname -m` in | |
| x86_64) | |
| QEMU_CMD="$QEMU_CMD-x86_64" | |
| ;; | |
| i686) | |
| QEMU_CMD="$QEMU_CMD-i386" | |
| ;; | |
| *) | |
| printf "unknown architecture\n" | |
| exit 1 | |
| ;; | |
| esac | |
| # try to enable kvm, if available | |
| VM_KVM_CMD="" | |
| `lsmod | grep "kvm" >/dev/null 2>&1` | |
| if [ $? -eq 0 ]; then | |
| VM_KVM_CMD="-enable-kvm" | |
| fi | |
| # start qemu | |
| $QEMU_CMD -hda "$VM_USED_IMAGE" $VM_KVM_CMD -usb -usbdevice tablet -m "$VM_MEMORY" -rtc base=localtime -vga std -net nic,model=rtl8139 -net user$VM_SMB_CMD $VM_PORTFWD_CMD $VM_CDROM_CMD | |
| # done ... | |
| if [ "$USE_OVERLAY" -eq 1 ]; then | |
| printf "removing temporary overlay file\n" | |
| read -p "Press [Enter] to continue (copy the overlay somewhere to keep it) ..." | |
| rm "$TEMPNAME" | |
| fi | |
| printf "finished.\n" |
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