Updating /etc/fstab for Network Booting a Pi 4

update-fstab.sh

PI_MAC="dc-a6-32-7a-b4-02"
TFTP_ROOT="/mnt/rust0/tftp/"


# Update /boot to point to the NFS mount of the TFTP folder for the Pi.
NFS_IP=$(cat ${ISCSI_ROOT_DIR}/etc/iscsi/iscsi.initramfs | grep 'ISCSI_TARGET_IP=' | cut -d '=' -f 2)
NFS_ROOT_PATH="${TFTP_ROOT}${PI_MAC}"
sudo sed -i -r -E \
  "s@.*/boot +.*@${NFS_IP}:${NFS_ROOT_PATH} /boot nfs defaults,vers=4.1,proto=tcp 0 0@" \
  ${ISCSI_ROOT_DIR}/etc/fstab

# Update / to point to the iSCSI drive.
ISCSI_ROOT_PARTUUID=$(sudo blkid | grep ${ISCSI_ROOT_PARTITION} | tr ' ' '\n' | grep PARTUUID | cut -d '=' -f 2 | tr -d '"')
sudo sed -i -r -E \
  "s@.*/ +.*@PARTUUID=${ISCSI_ROOT_PARTUUID} / ext4 _netdev,noatime 0 1@" \
  ${ISCSI_ROOT_DIR}/etc/fstab
  
# The connection to the iSCSI device is no longer needed, so clean it up.
sudo umount ${ISCSI_ROOT_DIR}
sudo iscsiadm --m node -T ${ISCSI_TARGET_IQN} --portal ${ISCSI_TARGET_IP}:3260 -u
sudo iscsiadm -m node -o delete -T ${ISCSI_TARGET_IQN} --portal ${ISCSI_TARGET_IP}:3260