Add: script to start a VM via libvirt

1 files changed, 105 insertions, 0 deletions

diff --git a/vm-libvirt.sh b/vm-libvirt.sh
new file mode 100755
index 0000000..c5788af
--- /dev/null
+++ b/vm-libvirt.sh
@@ -0,0 +1,105 @@
+#!/bin/sh
+#
+# Create a new VM using libvirt on the local host.
+
+set -eu
+
+
+verbose()
+{
+    echo "INFO: $@"
+}
+
+
+die()
+{
+    echo "$@" 1>&2
+    exit 1
+}
+
+
+get_ip()
+{
+    python -c '
+import sys, json
+leases = json.load(open(sys.argv[1]))
+for lease in leases:
+    if lease["mac-address"] ==  sys.argv[2]:
+        print lease["ip-address"]
+' "$1" "$2" || true
+}
+
+
+xz_uncompressed_size()
+{
+    xz --robot --verbose --list "$1" | awk '/^file/ { print $5 }'
+}
+
+raw_uncompressed_size()
+{
+    stat -c %s "$1"
+}
+
+
+# Check parameters.
+
+if [ "$#" -lt 2 ]
+then
+    die "Usage: $0 NAME IMAGE [virt-install-options]"
+fi
+verbose "Command line args OK"
+
+
+# Command line parameters: name of VM and image file.
+name="$1"
+image="$2"
+verbose "creating VM $name from image $image"
+
+shift 2
+
+# Does the image exist?
+if [ ! -e "$image" ]
+then
+    echo "$image does not exist" 1>&2
+    exit 1
+fi
+verbose "$image exists"
+
+
+# Create VM.
+verbose "Creating VM"
+virt-install --connect qemu:///system \
+             --quiet \
+             --name="$name" \
+             --memory=8192 \
+             --cpu=host-model-only \
+             --import \
+             --os-variant=debian9 \
+             --disk="path=$image,cache=none" \
+             --network="network=default" \
+             --graphics=spice \
+             --noautoconsole \
+             "$@"
+
+# Wait for the VM to get a DHCP response and add it to /etc/hosts.
+verbose "Waiting for VM to boot to gets its MAC"
+
+mac="$(virsh -c qemu:///system dumpxml "$name" |
+       sed -n "/<mac address=/s/^.*'\(.*\)'.*/\1/p")"
+verbose "MAC: $mac"
+
+# Wait for libvirt's DHCP server to give the VM an IP.
+verbose "Waiting for VM to get its IP"
+ip=""
+leases=/var/lib/libvirt/dnsmasq/virbr0.status
+while [ "$ip" = "" ]
+do
+    sleep 1
+    if [ -s "$leases" ]
+    then
+        ip="$(get_ip "$leases" "$mac")"
+    fi
+done
+
+# Done.
+echo "Virtual machine $name ($ip) has been created and started."