Post-install script that can be run during first-boot of a virtual server. Assumes network configuration is in place and working. Goes through all its mac addresses and tries to use them to retrieve its hostname from Satellite. Once done, the hostname is used to retrieve a tailored post-install script from Satellite.

satellite6-post-install-finish.sh

#!/bin/bash

if [[ -e /.configure_satellite_client && $EUID = 0 ]]; then
  SATELLITE_USERNAME=exampleuser
  SATELLITE_PASSWORD=examplepass123
  SATELLITE_SERVER=satellite.example.com
  FINISH_SCRIPT=/root/post_install_finish_script.sh
  LOG_FILE=/root/post_install_finish_script.log
  satellite_api=https://${SATELLITE_SERVER}/api/v2
  hostname=
  mac_address=

  exec &> >(tee -a "$LOG_FILE") 2>&1

  list_of_macs=$(ip link | grep "link/ether" | awk '{print $2}')
  echo "Found following MAC addresses: $list_of_macs"
  
  function get_json_value() {
    local file="$1"
    local key="$2"
    cat "$file" \
      | python -c \
      "import sys, json; print(json.load(sys.stdin)['results'][0]['$key'])" \
      2>/dev/null
  }

  for mac in $list_of_macs; do
    hostname=$(curl -Lks \
      --user "$SATELLITE_USERNAME":"$SATELLITE_PASSWORD" \
      -H "Content-Type:application/json" \
      -H "Accept:application/json" \
      "${satellite_api}/hosts?search=${mac}" \
      | get_json_value /dev/stdin name)
    if [[ $hostname ]]; then
      mac_address=$mac
      break
    fi
  done

  if [[ $hostname ]]; then
    echo "Using following values:"
    echo "  - Hostname: $hostname"
    echo "  - MAC address: $mac_address"
  else
    echo "None of these MAC addresses exist in Satellite: $list_of_macs"
    exit 1
  fi

  curl -Lks -o ${FINISH_SCRIPT} \
    --user "$SATELLITE_USERNAME":"$SATELLITE_PASSWORD" \
    -H "Content-Type:application/json" \
    -H "Accept:application/json" \
    https://${SATELLITE_SERVER}/unattended/finish?hostname=${hostname}

  chmod 0600 "$FINISH_SCRIPT"
  bash -x "$FINISH_SCRIPT"

  rm -f /.configure_satellite_client
fi