#!/bin/bash -x

# Create a 2GB disk image
dd if=/dev/zero of=foo bs=1M count=1 seek=2000

# Loopback mount the image
sudo kpartx -s -v -a foo

# Create a partition table and 2GB primary partition w/ext4
sudo parted foo -s -- mklabel msdos
sudo parted foo -s -- mkpart primary ext4 2M 2G
sudo kpartx -s -v -a /dev/loop0
sudo mkfs -t ext4 /dev/mapper/loop0p1

# Check the partition table
sudo sfdisk -l foo

# Remove the loop device
sudo kpartx -s -v -d foo

# Resize the image to 8GB
qemu-img resize -f raw foo 8G

# Loopback mount the file
sudo kpartx -s -v -a foo

# Remove the partition table kernel mappings
## THIS APPEARS TO BE BROKEN btwn util-linux 2.28-5ubuntu2 and 2.28.1-1ubuntu1
sudo kpartx -s -v -d /dev/loop0 

#sudo losetup -d /dev/loop0
#losetup

# Grow the partitions
sudo growpart /dev/loop0 1	# Regressed (worked previous on Aug 28th)
#sudo parted /dev/loop0 -s -- resizepart 1 8G	# Works
#sudo growpart foo 1				# Works
echo $?

sudo kpartx -s -v -a /dev/loop0
sudo e2fsck -f -y -E discard /dev/mapper/loop0p1
sudo resize2fs /dev/mapper/loop0p1
sudo zerofree /dev/mapper/loop0p1

# Clean up
sudo kpartx -s -v -d foo
rm foo