Add update_checker.sh (#238)

This adds a script that parses create_stack for component versions
and URLs and compares them to the latest versions available.

Signed-off-by: Justin Scott <justin.a.scott@intel.com>

clr-k8s-examples/hack/update_checker.sh

@@ -0,0 +1,166 @@
+#!/usr/bin/env bash
+
+###
+# update_checker.sh
+# Parses create_stack.sh for urls and versions
+# Curls urls for latest version and reports the comparison
+##
+
+# first argument is path to create_stach.sh
+COMPONENT_FILE="${1:-$create_stack.sh}"
+# set CLRK8S_DEBUG=1 for debug output
+DEBUG=${CLRK8S_DEBUG:-0}
+# set CLRK8S_NO_COLOR=1 for no colors
+NO_COLOR=${CLRK8S_NO_COLOR:-""}
+# set CLRK8S_ALL=1 for all results, not just changed
+ALL=${CLRK8S_ALL:-""}
+# add components to skip (not check)
+# - canal doesn't use git repo tags for revisions
+declare -a COMPONENT_SKIP=( CANAL )
+
+# internal vars
+declare -A COMPONENT_VER
+declare -A COMPONENT_URL
+LATEST_URL=""
+
+# usage prints help and exit
+function usage(){
+	echo "Compare default component versions to latest release"
+	echo "usage: update_checker.sh <path to create_stack.sh>"
+	exit 0
+}
+# log echoes to stdout
+function log(){
+	echo "$1"
+}
+# debug echoes to stdout if debug is enabled
+function debug(){
+	if [[ "${DEBUG}" -ne 0 ]]; then
+	  echo "$1"
+	fi
+}
+# extract_component_data scans file for component versions and urls and add them to maps
+function extract_component_data(){
+	file=${1:-$COMPONENT_FILE}
+	name=""
+	version=""
+	url=""
+	while read -r line
+	do
+		# versions
+	  if [[ $line =~ "_VER=" ]]; then
+			debug "Found component version $line"
+			name=${line%%_*}
+			if [[ "$COMPONENT_SKIP" =~ (^|[[:space:]])"$name"($|[[:space:]]) ]]; then
+				debug "Skipping component $name"
+				continue
+			fi
+			versions=${line#*=}
+			if [[ $versions =~ ":-" ]]; then
+				version=${line#*:-}
+			fi
+			# cleanup value
+			version=${version%\}}
+			version=${version%\}\"}
+			if [[ -n "$name" && ${COMPONENT_VER[$name]} == "" ]]; then
+				debug "Adding component $name=$version to COMPONENT_VER"
+				COMPONENT_VER[$name]=$version
+	  	fi
+	  fi
+
+	  # urls
+	  if [[ $line =~ "_URL=" ]]; then
+	    debug "Found component URL $line"
+			name=${line%%_*}
+			if [[ $COMPONENT_SKIP =~ (^|[[:space:]])"$name"($|[[:space:]]) ]]; then
+				debug "Skipping component $name"
+				continue
+			fi
+			urls=${line#*=}
+
+			if [[ $urls =~ ":-" ]]; then
+				urls=${line#*:-}
+			fi
+			# cleanup value
+			url=${urls%\"}
+			url=${url#\"}
+			if [[ -n "$name" && ${COMPONENT_URL[$name]} == "" ]]; then
+				debug "Adding component $name=$url to COMPONENT_URL"
+				COMPONENT_URL[$name]=$url
+	  	fi
+	  fi
+
+	done < $file
+
+}
+# resolve_latest_url extracts the real release/latest url from a repo url
+function resolve_latest_url(){
+	repo=$1
+	url=${repo%.git*}/releases/latest
+	LATEST_URL=$(curl -Ls -o /dev/null -w %{url_effective} $url)
+	if [[ "$?" -gt 0 ]]; then
+		echo "curl error, exiting."
+		exit 1
+	fi
+}
+# function_exists checks if a function exists
+function function_exists() {
+    declare -f -F "$1" > /dev/null
+    return $?
+}
+function report(){
+	if [[ -z $NO_COLOR ]]; then
+		BOLD="\e[1m\e[33m"
+		BOLD_OFF="\e[0m"
+  fi
+  mode="changed"
+  out=""
+  if [[ -n "$1" ]]; then
+  	mode="all"
+  fi
+	out+="\n"
+	out+="Components ($mode)\n"
+	out+="--------------------------\n"
+	echo -e $out
+	out="NAME CURRENT LATEST\n"
+	# loop thru each url, get latest version and report
+	for k in "${!COMPONENT_URL[@]}";
+	do
+		name=$k
+		resolve_latest_url "${COMPONENT_URL[$k]}"
+		latest_url="$LATEST_URL"
+		latest_ver="${latest_url#*tag/}"
+		current_ver="${COMPONENT_VER[$name]}"
+		if [[ "${current_ver}" != "${latest_ver}" ]]; then
+			out+="$name $current_ver $BOLD $latest_ver $BOLD_OFF\n";
+		fi
+		if [[ "${current_ver}" == "${latest_ver}" && -n $ALL ]]; then
+			out+="$name $current_ver $latest_ver\n";
+		fi
+	done;
+	echo -e "${out}" | column -t
+	if [[ "${#COMPONENT_SKIP[@]}" -gt 0 ]]; then
+		echo "---"
+		echo "WARNING: Skipped comparisions for the following components:"
+		for s in "${!COMPONENT_SKIP[@]}"
+		do
+			echo "${COMPONENT_SKIP[$s]}"
+		done
+	fi
+}
+###
+# Main
+##
+
+# print help if no args
+if [[ "$#" -eq 0 ]]; then
+	usage
+fi
+
+# get the versions
+extract_component_data "$1"
+# output
+report "${ALL}"
+
+
+