links.sh

#!/bin/bash

# Name: links.sh
# Author: Ladar Levison
#
# Description: Used to verify packer configurations, and validate URLs before kicking off a build.

# The list of packer config files.
FILES="packer-docker.json packer-libvirt.json packer-vmware.json packer-virtualbox.json"

# Collect the list of ISO urls.
ISOURLS=(`grep --no-messages -E "iso_url|guest_additions_url" ${FILES} | awk -F'"' '{print $4}'`)
ISOSUMS=(`grep --no-messages -E "iso_checksum|guest_additions_sha256" ${FILES} | grep -v "iso_checksum_type" | awk -F'"' '{print $4}'`)

# Verify all of the ISO locations are still valid.
function verify_url {

  # Grab just the response header and look for the 200 response code to indicate the link is valid.
  curl --silent --head "$1" | head -1 | grep --silent --extended-regexp "HTTP/1\.1 200 OK|HTTP/2\.0 200 OK"

  # The grep return code tells us whether it found a match in the header or not.
  if [ $? != 0 ]; then
    printf "Link Failure:  $1\n\n"
    exit 1
  fi
}

# Verify all of the ISO locations are valid and then download the ISO and verify the hash.
function verify_sum {

  # Grab just the response header and look for the 200 response code to indicate the link is valid.
  curl --silent --head "$1" | head -1 | grep --silent --extended-regexp "HTTP/1\.1 200 OK|HTTP/2\.0 200 OK"

  # The grep return code tells us whether it found a match in the header or not.
  if [ $? != 0 ]; then
    printf "Link Failure:  $1\n\n"
    exit 1
  fi

  # Grab the ISO and pipe the data through sha256sum, then compare the checksum value.
  curl --silent "$1" | sha256sum | grep --silent "$2"

  # The grep return code tells us whether it found a match in the header or not.
  if [ $? != 0 ]; then
    SUM=`curl --silent "$1" | sha256sum | awk -F' ' '{print $1}'`
    printf "Hash Failure:  $1\n"
    printf "Found       -  $SUM\n"
    printf "Expected    -  $SUM\n\n"
    exit 1
  fi

  printf "Validated   :  $1\n"
  return 0
}

# Validate the templates before building.
function verify_json() {
  packer validate $1
  if [[ $? != 0 ]]; then
    tput setaf 1; tput bold; printf "\n\nthe $1 packer template failed to validate...\n\n"; tput sgr0
    for i in 1 2 3; do printf "\a"; sleep 1; done
    exit 1
  fi
}

function links() {

  for ((i = 0; i < ${#ISOURLS[@]}; ++i)); do
      verify_url "${ISOURLS[$i]}" "${ISOSUMS[$i]}"
  done

  # Let the user know all of the links passed.
  printf "\nAll ${#ISOURLS[@]} of the install media locations are still valid...\n\n"
}

function sums() {

  for ((i = 0; i < ${#ISOURLS[@]}; ++i)); do
      verify_sum "${ISOURLS[$i]}" "${ISOSUMS[$i]}"
  done

  # Let the user know all of the links passed.
  printf "\nAll ${#ISOURLS[@]} of the install media locations are still valid...\n\n"
}

function validate() {

  LIST=($FILES)

  for ((i = 0; i < ${#LIST[@]}; ++i)); do
      verify_json "${LIST[$i]}"
  done

}

# The generic functions.
if [[ $1 == "links" ]]; then links
elif [[ $1 == "sums" ]]; then sums
elif [[ $1 == "validate" ]]; then validate

# Catchall
else
	echo ""
	echo " Commands"
	echo $"   `basename $0` {sums|links|validate}"
	echo ""
	echo " Packer Files"
	echo $"   $FILES"
	echo ""
	echo " Please select a target and run this command again."
	echo ""
	exit 2
fi