#!/bin/bash
#
# proof of concept script to pull a kickstart template and adapt it to 
# a config for a specific host

Self=$(basename $0)
Template="supermicro/SYS-5018D-FN8T/dtn-10g.ks"

function print_usage {
  echo "usage: $Self <options>"
}

function print_help {
cat <<EOF
$Self <options>
This script pulls a kickstart template from somewhere and creates a 
specific kickstart config for a specific host based on the options 
passed to it.

The kickstart config will then be placed somewhere, where it can be pulled
by the installer, which is probably the floppy image borne ipxe booted
CentOS7 install system.

Options:
  -D, --domain          domain, to complete FQDN
  -G, --gateway         Gateway of target system
  -H, --host            hostname of the target system
  -I, --ip              IP address of target system
  -M, --netmask         Netmask of target system
  -N, --nameserver      Nameserver of target system
  -P, --publish-path    Path where results will be stored
  --template            Template to use. This is a relative path, plus the 
                        name of the template file. Default:
                        ${Template}
  --sec-ip		IP of secondary interface
  --sec-nm		Netmask of secondary interface
  -h, --help            this

EOF
}

# Needed 'macro/substitutions:
# INSTALLSERVER
# PRIGATEWAY
# PRIIP
# PRINETMASK
# PRINAMESERVERS
# SECIP
# SECNETMASK
# HOSTNAME
# DOMAIN

function parse_commadline {
  while [ "$#" -gt 0 ] ; do
    case "$1" in
    -h|--help)
      print_help
      exit 0
      ;;
    -H|--host)
      Host="$2"
      shift
      ;;
    -D|--domain)
      Domain="$2"
      shift
      ;;
    -I|--ip)
      IP="$2"
      shift
      ;;
    -M|--netmask)
      NM="$2"
      shift
      ;;
    -G|--gateway)
      GW="$2"
      shift
      ;;
    -N|--nameserver)
      NS="$2"
      shift
      ;;
    -P|--publish-path)
      PublishPath="$2"
      shift
      ;;
    -K|--kserver)
      Kserver="$2"
      shift
      ;;
    --template)
      Template="${2}"
      shift
      ;;
    --sec-ip)
      SecIP="${2}"
      shift
      ;;
    --sec-nm)
      SecNM="${2}"
      shift
      ;;
    -T|--tmp-dir)
      TmpDir="${2}"
      shift
      ;;
    *)
      echo "what do you mean \"$1\"?"
      exit 1
      ;;
    esac
    shift
  done
}

function check_options {
  if [ "x${Host}" = "x" ]
  then
    echo "${Self}: --host is mandatory"
    print_usage
    exit 1
  fi
  if [ "x${Domain}" = "x" ]
  then
    echo "${Self}: --domain is mandatory"
    print_usage
    exit 1
  fi
  if [ "x${IP}" = "x" ]
  then
    echo "${Self}: --ip is mandatory"
    print_usage
    exit 1
  fi
  if [ "x${NM}" = "x" ]
  then
    echo "${Self}: --netmask is mandatory"
    print_usage
    exit 1
  fi
  if [ "x${GW}" = "x" ]
  then
    echo "${Self}: --gateway is mandatory"
    print_usage
    exit 1
  fi
  if [ "x${SecIP}" = "x" ]
  then
    echo "${Self}: --sec-ip is mandatory"
    print_usage
    exit 1
  fi
  if [ "x${SecNM}" = "x" ]
  then
    echo "${Self}: --sec-nm is mandatory"
    print_usage
    exit 1
  fi
  if [ "x${Kserver}" = "x" ]
  then
    Kserver="109.105.122.84"
  fi
  if [ "x${NS}" = "x" ]
  then
    NS="109.106.96.141"
  fi
}

parse_commadline ${@}
check_options

if [ "x${TmpDir}" = "x" ]
then
  TmpDir=$(mktemp -d)
else
  mkdir -p "${TmpDir}"
fi

curl -o "${TmpDir}/ks-template" "https://git.nordu.net/?p=ndn-boot-img-stuffs.git;a=blob_plain;f=ks-template/hw/${Template}"
if [ $? -ne 0 ]
then
  echo "failed to download template. This is bad."
  exit 1
fi
if $(file "${TmpDir}/ks-template" | grep -q XML)
then
  echo "downloaded file (${TmpDir}/ks-template) looks wrong"
  exit 1
fi

# substitutions:
sed -ie "s/HOSTNAME/${Host}/g" "${TmpDir}/ks-template"
sed -ie "s/INSTALLSERVER/${Kserver}/g" "${TmpDir}/ks-template"
sed -ie "s/PRIIP/${IP}/g" "${TmpDir}/ks-template"
sed -ie "s/PRINETMASK/${NM}/g" "${TmpDir}/ks-template"
sed -ie "s/PRIGATEWAY/${GW}/g" "${TmpDir}/ks-template"
sed -ie "s/PRINAMESERVERS/${NS}/g" "${TmpDir}/ks-template"
sed -ie "s/SECIP/${SecIP}/g" "${TmpDir}/ks-template"
sed -ie "s/SECNETMASK/${SecNM}/g" "${TmpDir}/ks-template"

if [ "x${PublishPath}" = "x" ]
then
  echo "PublishPath no set, leaving everything in ${TmpDir}"
else
  mkdir -p "${PublishPath}/ks"
  mv "${TmpDir}/ks-template" "${PublishPath}/ks/${Host}.ks"
  rm -rf "${TmpDir}/*"
fi