MOSS Disk Image Shell Script

#Sets up a common disk image that is used for building the VM disk or
#installing to USB

#See: http://wiki.osdev.org/Loopback_Device
#See: http://superuser.com/questions/130955/how-to-install-grub-into-an-img-file

export CYLINDERS=100
export HEADS=16
export SECTORS_PER_TRACK=63
export SECTOR_SIZE=512

#Make HDD image
dd if=/dev/zero of=build/moss-disk.bin bs=$((HEADS*SECTORS_PER_TRACK*SECTOR_SIZE)) count=$CYLINDERS

#Make partition on disk file (re-enable as necessary)
cat <<EOF | fdisk -u -C$((CYLINDERS)) -S$((SECTORS_PER_TRACK)) -H$((HEADS)) build/moss-disk.bin
o
n
p



a
1
p
w
EOF

#Mount the disk image in a loop device
sudo losetup /dev/loop0 build/moss-disk.bin
#Make the disk image's partitions into devices
sudo kpartx -v -a /dev/loop0
#Mount the disk image's first partition in a loop device
#   Note: normally you now would mount /dev/loop0p1 directly.  But, GrUB doesn't like that?
sudo losetup /dev/loop1 /dev/mapper/loop0p1

#Make a file system on first partition
#   Note: source also explains how to set up FAT32
sudo mke2fs /dev/loop1

#Note: may have to unmount loops, restart, and then remount loops here.  See http://forum.osdev.org/viewtopic.php?f=1&t=26907

#Mount the first partition
sudo mount /dev/loop1 /mnt
#Setup a device map, as per S.U. question (link above)
#   Note: IDK why, but I had to create it in /tmp first.
#   Note: I haven't tested this part in the script; I typed it in by hand using CTRL+V/CTRL+I to
#         get the TAB. I based this off of the device map in the host.
sudo mkdir -p /mnt/boot/grub
cat > /tmp/device.map <<EOF
(hd0)\t/dev/loop0
(hd0,1)\t/dev/loop1

EOF
sudo cp /tmp/device.map /mnt/boot/grub/device.map

#Install grub
sudo grub-install --root-directory=/mnt /dev/loop0

#Unmount the disk image from the loop devices
sudo losetup -d /dev/loop0
sudo losetup -d /dev/loop1