Add helper for starting QEMU

1 files changed, 88 insertions, 0 deletions

diff --git a/qemu-start b/qemu-start
new file mode 100755
index 0000000..ff9b62a
--- /dev/null
+++ b/qemu-start
@@ -0,0 +1,88 @@
+#!/bin/sh
+
+# fails because script is missing: -netdev tap,id=qnet0
+# http://wiki.qemu.org/Documentation/Networking
+# https://wiki.archlinux.org/index.php/QEMU#Tap_networking_with_QEMU
+
+[ $# -lt 1 ] || \
+case $1 in
+ISO=*.iso)
+	ISO="$(echo "$1" | sed 's/^ISO//')"
+	shift
+	;;
+*.iso|*.img|*.qcow2|'')
+	ISO="$1"
+	shift
+	;;
+esac
+
+: ${ISO=/usr/share/virtualbox/ubuntu-12.04.1-desktop-amd64.iso}
+case $ISO in
+*.iso)
+	set -- -cdrom "$ISO" "$@"
+	;;
+*.img|*.qcow2)
+	set -- -hda "$ISO" "$@"
+	;;
+'') # do not add cdrom/hdd
+	;;
+*)
+	echo "Unknown ISO extension: $ISO"
+	exit 1
+	;;
+esac
+
+#hp=/dev/hugepages/qemu-$(uuidgen)
+hp=/dev/hugepages/qemu
+if [ -e "$hp" ]; then
+	echo "Hugepage already exists, not using it"
+	hp=
+elif grep '^HugePages_Total: *0$' /proc/meminfo -q; then
+	echo "No HugePages available, not using it"
+	hp=
+elif mkdir "$hp" ;then
+	echo "Enabling hugepages: $hp"
+	set -- -mem-path "$hp" "$@"
+else
+	hp=
+fi
+
+[ -z "$hp" ] || trap "rmdir $hp" EXIT
+
+# ssh -p 2222 localhost
+usernet=,hostfwd=tcp:127.0.0.1:2222-:22
+
+if [ -z "${NET-x}" ]; then
+	echo "Not using a network"
+elif [ "$NET" = "br" ] && [ -e /sys/class/net/brqemu0 ]; then
+	echo "Using brqemu0"
+	set -- "$@" \
+	-netdev bridge,br=brqemu0,helper=/usr/lib/qemu/qemu-bridge-helper,id=hn0 \
+	-device virtio-net,netdev=hn0
+elif [ "$NET" = "tap" ] && [ -e /sys/class/net/tapqemu0 ]; then
+	# see http://felipec.wordpress.com/2009/12/27/setting-up-qemu-with-a-nat/
+	gw=10.0.4.1
+	echo "Using tap - gw $gw"
+	[ -n "$NONET" ] || \
+	ip link show tapqemu0 | grep -q 'state UP' || \
+		sudo ifconfig tapqemu0 $gw/24 up
+	set -- "$@" \
+	-netdev tap,id=qnet0,ifname=tapqemu0,script=no \
+	-device virtio-net,netdev=qnet0
+elif [ "$NET" = "user" ]; then
+	echo "Using user"
+	set -- "$@" \
+	-netdev user,id=qnet0$usernet \
+	-device virtio-net,netdev=qnet0
+fi
+
+qemu-system-x86_64 \
+	-enable-kvm -m 2G -smp threads=2 \
+	-vga std -no-quit -display sdl \
+	"$@"
+
+# I am stupid, I need brctl before doing this. Also, create /etc/qemu/bridge.conf
+# possibly helpful for bridging: https://bbs.archlinux.org/viewtopic.php?id=147134
+#	-netdev bridge,helper=/usr/lib/qemu/qemu-bridge-helper,id=hn0 \
+#	-device virtio-net,netdev=hn0 \
+# note: virtio-net is an alias for virtio-net-pci