# sed -> stream editor
# to create the partitions programatically (rather than manually)
# we're going to simulate the manual input to fdisk
# The sed script strips off all the comments so that we can 
# document what we're doing in-line with the actual commands
# Note that a blank line (commented as "default" will send a empty
# line terminated with a newline to take the fdisk default.
export TGTDEV=$1

sed -e 's/\s*\([\+0-9a-zA-Z]*\).*/\1/' << EOF | fdisk ${TGTDEV}
	o # clear the in memory partition table
	n # new partition
	p # primary partition
	1 # partition number 1
	  # default - start at beginning of disk
	+18G # 18GB system partition
	n # new partition
	p # primary partition
	2 # partition number 2
	  # default, start immediately after preceding partition
	+1G # 1GB swap partition
	t # change partition type
	2 # choose partition
	82 # type swap
	n # new partition
	p # primary partition
	3 # partion number 2
	  # default, start immediately after preceding partition
	+8G # 8GB service partition (backup)
	n # new partition
	p # primary partition
	  # default, start immediately after preceding partition
	  # default, extend partition to end of disk
	a # make a partition bootable
	1 # bootable partition is partition 1 -- /dev/sda1
	p # print the in-memory partition table
	w # write the partition table
	q # and we're done
EOF

sleep 2