Mount and Copy Root Contents for Network Booting a Pi 4

copy-root-contents.sh

ISCSI_ROOT_PARTITION="/dev/sdb1"


# Create the ext4 Filesystem
sudo mkfs.ext4 /${ISCSI_ROOT_PARTITION}
ISCSI_ROOT_DIR="$(mktemp -d)"
sudo mount "${ISCSI_ROOT_PARTITION}" ${ISCSI_ROOT_DIR}

# Mount the Root Partion in the Generated Image
CREATION_OUTPUT=$(sudo partx --add -v output-arm-image/image)
LOOP_DEVICE=$(echo ${CREATION_OUTPUT} | sed -E 's@.*(/dev/loop[0-9]+).*@\1@')
IMAGE_ROOT_DIR="$(mktemp -d)"
sudo mount "${LOOP_DEVICE}p2" ${IMAGE_ROOT_DIR}

# Begin the Copy
sudo rsync -a --info=progress2 "${IMAGE_ROOT_DIR}/" ${ISCSI_ROOT_DIR}

# The generated image is no longer needed, so we can cleanup.
sudo umount ${IMAGE_ROOT_DIR}
sudo partx --delete -v ${LOOP_DEVICE}