custom-config.fcc

variant: fcos
version: 1.1.0

storage:
  files:
    - path: /etc/systemd/network/99-default.link
      mode: 420
      contents:
        inline: |
          [Link]
          NamePolicy=mac
          MACAddressPolicy=persistent
    - path: /etc/NetworkManager/conf.d/10-dhcp-config.conf
      mode: 420
      contents:
        inline: |
          [main]
          no-auto-default=*
          dhcp=dhclient
    - path: /usr/local/bin/capture-macs
      mode: 0755
      contents:
        inline: |
          #!/usr/bin/env bash
          set -ex
          echo "Processing MAC addresses"
          cmdline=( $(</proc/cmdline) )
          karg() {
              local name="$1" value="${2:-}"
              for arg in "${cmdline[@]}"; do
                  if [[ "${arg%%=*}" == "${name}" ]]; then
                      value="${arg#*=}"
                  fi
              done
              echo "${value}"
          }
          # Wait for device nodes
          udevadm settle
          
          macs="$(karg macAddressList)"
          if [[ -z $macs ]]; then
            echo "No MAC addresses specified."
            exit 1
          fi
          export PRIMARY_MAC=$(echo $macs | awk -F, '{print $1}')
          export SECONDARY_MAC=$(echo $macs | awk -F, '{print $2}')
          mount "/dev/disk/by-label/boot" /boot
          echo -e "PRIMARY_MAC=${PRIMARY_MAC}\nSECONDARY_MAC=${SECONDARY_MAC}" > /boot/mac_addresses
         
    - path: /usr/local/bin/create-datastore
      mode: 0755
      contents:
        inline: |
          #!/bin/bash

          LABEL=datastore
          OFFSET=120G

          set -euo pipefail

          cmdline=( $(</proc/cmdline) )
          karg() {
              local name="$1" value="${2:-}"
              for arg in "${cmdline[@]}"; do
                  if [[ "${arg%%=*}" == "${name}" ]]; then
                      value="${arg#*=}"
                  fi
              done
              echo "${value}"
          }

          # Get install device
          device="$(karg coreos.inst.install_dev)"
          if [[ -z $device ]]; then
              echo "Install device not specified."
              exit 1
          fi
          # Append /dev/ if missing
          device="/dev/${device##/dev/}"

          # Wait for device nodes
          udevadm settle

          # Check for partitions other than the system ones
          if lsblk --pairs --output NAME,TYPE,PARTLABEL "${device}" |\
              awk '/TYPE="part"/ && !/PARTLABEL="(boot|EFI-SYSTEM|BIOS-BOOT|root|luks_root)"/ {print; exit 1}'
          then
              echo "Creating data partition \"${LABEL}\""

              # Relocate second GPT header to end of disk and create partition
              sgdisk --move-second-header \
                  --new=0:+"${OFFSET}":0 --change-name=0:"${LABEL}" \
                  "${device}"

              # Wait for device node
              udevadm settle
          else
              echo "Found existing data partition; not creating a new one"
          fi
systemd:
  units:
    - name: capture-macs.service
      enabled: true
      contents: |
        [Unit]
        Description=Capture MAC address from kargs
        After=create-datastore.service
        Before=coreos-installer.target
        ConditionKernelCommandLine=custom-config

        [Service]
        Type=oneshot
        ExecStart=/usr/local/bin/capture-macs

        [Install]
        RequiredBy=coreos-installer.target
    - name: create-datastore.service
      enabled: true
      contents: |
        [Unit]
        Description=Create data partition if one doesn't already exist
        After=coreos-installer.service
        Before=coreos-installer.target
        ConditionKernelCommandLine=custom-config

        [Service]
        Type=oneshot
        ExecStart=/usr/local/bin/create-datastore

        [Install]
        WantedBy=coreos-installer.target