Azure: Mount data disks attached to a VM on boot

azure_data_disk_mount.sh

#!/bin/bash

DISK=$1
VG=$2
VOL=$3
MOUNTPOINT=$4

# Wait for x disks to be available
while [ `ls -l $DISK | grep lun | wc -l` -lt 1 ]; do
    echo "Waiting on disks..."; 
    sleep 5
done

DISK_PARTITION="${DISK}-part1"

# Check if the disk already has a partition
if ! ls "${DISK_PARTITION}"; then
    # Partition disk if no partition exists
    sed -e 's/\s*\([\+0-9a-zA-Z]*\).*/\1/' << EOF | fdisk $DISK
n
p
1



w
EOF

    DISK_PARTITION=$(ls ${DISK}* | tail -n 1) 

    # Create physical volume
    pvcreate $DISK_PARTITION
fi
# Create or extend volume group
if ! vgs | grep -q $VG; then
    vgcreate $VG $DISK_PARTITION
else
    vgextend $VG $DISK_PARTITION
fi

# Create logical volume
if [[ -z $SIZE ]]; then
    SIZE="100%FREE"
fi

if ! lvdisplay | grep -q "/dev/$VG/$VOL"; then
    lvcreate -l $SIZE -n $VOL $VG

    # Create filesystem
    mkfs.ext3 -m 0 /dev/$VG/$VOL
fi

# Check if the entry already exists in fstab
if ! grep -q "/dev/$VG/$VOL" /etc/fstab; then
    echo "/dev/$VG/$VOL $MOUNTPOINT ext3 defaults 0 2" >> /etc/fstab
fi

# Create mount point
mkdir -p $MOUNTPOINT

# Mount
mount $MOUNTPOINT

chmod ugo+rwx $MOUNTPOINT
touch $MOUNTPOINT/mounted.txt
echo "Mount done"