kvm add drive script added.

Signed-off-by: Michael Valdron <michael.valdron@gmail.com>

kvm/add-drive.sh

@@ -0,0 +1,98 @@
+#!/bin/sh
+
+# Check if hypervisor is installed
+if [ -z "$(which virsh)" ]
+then
+    echo "libvirt is not installed."
+    exit 1
+# Check if running as root or privileged user
+elif [ -z "$(groups | tr ' ' '\n' | grep libvirt)" ] && [ "$EUID" -ne 0 ]
+then
+    echo "Please run as root or user under 'libvirt' group."
+    exit 2
+fi
+
+# Set pool to default path 
+if [ -z "${IMAGE_POOL}" ]
+then
+    if [ "$EUID" -ne 0 ]
+    then
+        echo "Please run as root."
+        exit 2
+    fi
+    IMAGE_POOL=$(virsh pool-dumpxml default | awk -F'[<>]' '/path/ {print $3}')
+fi
+
+# Variables
+base_dir=$(dirname $0)
+vm_name=$1
+image_uri=$2
+new_dev=$3
+
+# Read in array of current VMs
+read -r -a vms <<< "$(virsh list --name --all | tr '\n' ' ')"
+
+# Find specified VM
+vm_found=0
+for vm in ${vms[@]}
+do
+    if [ "${vm}" == "${vm_name}" ]
+    then
+        vm_found=1
+        break
+    fi
+done
+
+# Throw error if specified VM is not found
+if [[ $vm_found -ne 1 ]]
+then
+    echo "'${vm_name}' does not exist."
+    exit 3
+fi
+
+# Select target bus based on target device name, error if 
+# device name prefix does not match a compatible bus.
+if [[ $new_dev = vd* ]]
+then
+    targetbus=virtio
+elif [[ $new_dev = sd* ]]
+then
+    targetbus=sata
+else
+    echo "dev prefix '${new_dev:0:2}' is not valid."
+    exit 4
+fi
+
+# If uri to disk image is a local path append the file:// to uri (if not already there)
+if [[ ! $image_uri = http://* ]] && [[ ! $image_uri = https://* ]] && [[ ! $image_uri = file://* ]]
+then
+    image_uri=$([[ $image_uri = /* ]] && echo "file://${image_uri}" || echo "file://${PWD}/${image_uri}")
+fi
+
+# Read all devices with same prefix as specified name for the new device
+read -r -a existing_dev <<< "$(virsh domblklist ${vm_name} | awk '{print $1}' | grep -e ${new_dev:0:2} | tr '\n' ' ')"
+
+# Check if specified device name match any existing ones, if so throw error to user
+for dev in ${existing_dev[@]}
+do
+    if [ "${dev}" == "${new_dev}" ]
+    then
+        echo "'${new_dev}' already exists, please specific disk target labeled past '${existing_dev[-1]}'."
+        exit 5
+    fi
+done
+
+# Make image path, /path/to/pool/{vm-name}_{random-hash-string}.qcow2
+disk_path=${IMAGE_POOL}/${vm_name}_$(echo ${RANDOM} | md5sum | head -c 15; echo;).qcow2
+
+# If disk path exists, regenerate a new until it does not exist
+while [ -f $disk_path ]
+do
+    disk_path=${IMAGE_POOL}/${vm_name}_$(echo ${RANDOM} | md5sum | head -c 15; echo;).qcow2
+done
+
+# Download / Copy template disk image from uri to disk path
+curl -L $image_uri -o $disk_path
+
+# Attach disk at disk path to the vm specified
+virsh attach-disk $vm_name $disk_path $new_dev --persistent --driver=qemu --subdriver=qcow2 --targetbus=$targetbus