src/initscripts/system/aws

   1 #!/bin/sh
   2 ########################################################################
   3 # Begin $rc_base/init.d/aws
   4 ########################################################################
   5
   6 . /etc/sysconfig/rc
   7 . ${rc_functions}
   8
   9 MD_URL="http://169.254.169.254/latest/meta-data"
  10
  11 # https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/identify_ec2_instances.html
  12 running_on_ec2() {
  13         local uuid
  14
  15         # Check if the hypervisor UUID starts with ec2
  16         if [ -r "/sys/hypervisor/uuid" ]; then
  17                 uuid=$(</sys/hypervisor/uuid)
  18
  19                 [ "${uuid:0:3}" = "ec2" ] && return 0
  20         fi
  21
  22         # Check if the DMI product UUID starts with EC2
  23         if [ -r "/sys/devices/virtual/dmi/id/product_uuid" ]; then
  24                 uuid=$(</sys/devices/virtual/dmi/id/product_uuid)
  25
  26                 [ "${uuid:0:3}" = "EC2" ] && return 0
  27         fi
  28
  29         # We are not running on AWS EC2
  30         return 1
  31 }
  32
  33 case "${1}" in
  34         start)
  35                 # Do nothing if we are not running on AWS EC2
  36                 running_on_ec2 || exit 0
  37
  38                 boot_mesg "Setting up system to run on AWS EC2..."
  39
  40                 # Find the first interface to use
  41                 for i in /sys/class/net/*; do
  42                         [ -d "${i}" ] || continue
  43                         i=$(basename ${i})
  44
  45                         # Skip loopback
  46                         [ "${i}" = "lo" ] && continue
  47
  48                         # Use whatever we have found
  49                         intf="${i}"
  50                         break
  51                 done
  52
  53                 # Check if we found a network interface
  54                 if [ ! -n "${intf}" ]; then
  55                         echo_failure
  56
  57                         boot_mesg -n "Could not find a network interface" ${FAILURE}
  58                         boot_mesg "" ${NORMAL}
  59                 fi
  60
  61                 # Assign ourselves an IP address to communicate with the meta-data service
  62                 ip addr add 169.254.169.1/24 dev "${intf}"
  63                 ip link set "${intf}" up
  64
  65                 # Initialise system settings
  66                 if [ ! -s "/var/ipfire/main/settings" ]; then
  67                         hostname=$(curl ${MD_URL}/local-hostname)
  68
  69                         (
  70                                 echo "HOSTNAME=${hostname%%.*}"
  71                                 echo "DOMAINNAME=${hostname#*.}"
  72                                 echo "THEME=ipfire"
  73                                 echo "LANGUAGE=en"
  74                                 echo "KEYMAP=/lib/kbd/keymaps/i386/qwerty/us.map.gz"
  75                                 echo "TIMEZONE=/usr/share/zoneinfo/posix/UTC"
  76                         ) > /var/ipfire/main/settings
  77                 fi
  78
  79                 # Remove any IP addresses
  80                 ip addr flush dev "${intf}"
  81                 echo_ok
  82
  83                 # This script has now completed the first steps of setup
  84                 touch /var/ipfire/main/firstsetup_ok
  85                 ;;
  86
  87         status)
  88                 if running_on_ec2; then
  89                         echo "This system is running on AWS EC2"
  90                         exit 0
  91                 else
  92                         echo "This system is NOT running on AWS EC2"
  93                         exit 1
  94                 fi
  95                 ;;
  96
  97         *)
  98                 echo "Usage: ${0} {start|status}"
  99                 exit 1
 100                 ;;
 101 esac
 102
 103 # End $rc_base/init.d/aws