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|
#!/bin/sh
#
# Define and install a libvirt domain
#
# Copyright 2013 Guilhem Moulin <guilhem@fripost.org>
#
# Licensed under the GNU GPL version 3 or higher.
#
set -ue
PATH=/usr/bin:/bin
root=$(dirname "$0")
usage() {
cat >&2 <<-EOF
Usage:
$0 install <libvirt domain> [<QEMU image>]
Install the given domain, using the given image (created if
necessary) as a disk.
$0 view <libvirt domain>
Open a connection to a running domain using the Spice protocol
EOF
exit 1
}
getXMLattr() {
local id="$1" object="$2" attribute="$3" what="${4:-domain}"
local cmd
case "$what" in
domain) cmd=;;
network) cmd=net;;
esac
virsh "${cmd:+$cmd-}dumpxml" "$id" \
| xmlstarlet sel -t -m "/$what/$object" -n -v @"$attribute" \
| sed '/^\s*$/d'
}
add_net_section() {
local section="$1" xml="$2" net="${3:-$network}"
virsh net-update "$net" add "$section" --xml "$xml" --live --config
}
doesExist() {
virsh -r list --all --name | grep -qxF "$1"
}
isActive() {
virsh -r list --name | grep -qxF "$1"
}
install() {
[ $# -eq 1 -o $# -eq 2 ] || usage
local name=$1
local disk=${2:-$root/images/${name}.qcow2}
local darch
case "${ARCH:=$(/bin/uname -m)}" in
i386|i686) darch=i386;;
x86_64) darch=amd64;;
*) darch=$ARCH;;
esac
local version=$(sed -n '/^VERSION\s*=\s*/ {s///p;q}' $root/../preseed/Makefile)
local cdrom="$root/../preseed/dist/$darch/debian-$version-$darch-netinst-preseeded.iso"
if doesExist "$name"; then
echo "Error: Domain $name already exists. If you want to replace the domain, run" >&2
echo >&2
isActive "$name" && echo " virsh destroy $name" >&2
echo " virsh undefine $name" >&2
exit 1
fi
if ! [ -f "$cdrom" -a -r "$cdrom" ]; then
cat >&2 <<- EOF
Error: '$cdrom' does not exist or is not readable.
To create the preseeded image, run
cd $root/../preseed
ARCH=$darch make iso-preseed
EOF
exit 1
fi
grep -q '^kvm\s' /proc/modules || echo 'WARN: KVM not available!' >&2
if [ ! -f "$disk" ]; then
local size=12G
echo "Creating (sparse) $size disk image '$disk'" >&2
qemu-img create -f "${disk##*.}" -o size="$size",preallocation=metadata "$disk"
fi
# TODO: the bus should be chosen at random among sata,ide,scsi,usb
# TODO: test EFI: http://www.linux-kvm.org/page/OVMF
local network=default ip mac
virt-install -q \
--name "$name" \
--arch "$ARCH" \
--ram 128 \
--cdrom "$cdrom" \
--disk "$disk",cache=writeback,bus=sata \
--network network="$network" \
--graphics spice
# Attribute the next available IP. You may also want to add a domain
# section, e.g., <domain name='libvirt.example.org'/>, and prepend
# the DNS IP to /etc/resolv.conf.
# Cf. http://libvirt.org/formatnetwork.html
mac=$( getXMLattr $name devices/interface/mac address )
ip=$( getXMLattr $network ip/dhcp/host ip network | sort -n | tail -1 )
[ "$ip" ] || \
ip=$( getXMLattr $network ip address network )
ip=${ip%.*}.$(( 1 + ${ip##*.} ))
add_net_section ip-dhcp-host "<host mac='$mac' name='$name' ip='$ip'/>"
add_net_section dns-host "<host ip='$ip'><hostname>$name</hostname></host>"
cat >&2 <<- EOF
Domain '$name' has been created, and has been given IP $ip.
As you can see in
virsh list
it should now be up and running. To open a graphical console, run
$0 view $name
EOF
}
view(){
[ $# -eq 1 ] || usage
local domain="$1"
if ! doesExist "$domain"; then
cat >&2 <<- EOF
Error: Domain $domain does not exist. To create it, run
./virt install $domain
EOF
exit 1
elif ! isActive "$domain"; then
echo "Error: Domain $domain is not active" >&2
exit 1
fi
local type=$(getXMLattr "$domain" devices/graphics type)
local port=$(getXMLattr "$domain" devices/graphics port) || true
if ! [ "$type" = spice -a "$port" ]; then
echo "Error: Could not find a valid Spice server on domain '$domain'." >&2
exit 1
fi
spicec -h 127.0.0.1 -p $port
}
[ $# -gt 0 ] || usage
command="$1"
shift;
case "$command" in
install|view) $command "$@";;
*) usage
esac
|
