add winsparkle xml updated script

This script is needed to update a Windows Sparkle XML file
for Windows auto-update.

The script has been modified to take account of the new repository
dl.ring.cx.
It also requires gawk for inplace modifications.

Change-Id: I4ca9b3fcc126e22db3b5303fabda3c666ef2f7f1

scripts/winsparkle-xml-updater.sh

+#!/bin/bash
+
+# Update SPARKLE_FILE with given executable
+# Usage ./winsparkle-xml-updater.sh ring.exe <URI of winsparkle-ring.xml>
+
+PACKAGE=$1
+SPARKLE_SOURCE=$2
+SPARKLE_FILE=winsparkle-ring.xml
+TMP_FILE=winsparkle.tmp
+REPO_URL=${2%/${SPARKLE_FILE}}
+
+
+if [ ! -f ${PACKAGE} ]; then
+    echo "Can't find package aborting..."
+    exit 1
+fi
+
+if [ ! -s ${SPARKLE_FILE} ]; then
+    wget --no-check-certificate --retry-connrefused --tries=20 --wait=2 \
+         --random-wait --waitretry=10 ${SPARKLE_SOURCE} -O ${SPARKLE_FILE}
+    if [ $? -ne 0 ]; then
+        echo 'the winsparkle file have been badly overwriten; deleting it.'
+        rm -f winsparkle.xml
+        exit 1
+    fi
+fi
+
+if [[ $(basename ${PACKAGE}) == *"x86_64"* ]]
+then
+    OS="windows-x64";
+else
+    OS="windows-x86";
+fi
+
+#update URI in <link> field
+gawk -i inplace -v source="${SPARKLE_SOURCE}" '/<link>/{printf "        <link>";
+                                                        printf source; print "</link>"; next}1' ${SPARKLE_FILE}
+
+
+#update list with new image item
+cat << EOS > ${TMP_FILE}
+        <item>
+            <title>Ring nightly $(date "+%Y/%m/%d %H:%M")</title>
+            <pubDate>$(date -R)</pubDate>
+            <enclosure url="${REPO_URL}/$(basename ${PACKAGE})" sparkle:version="$(date +%Y%m%d)" sparkle:shortVersionString="nightly-$(date "+%Y%m%d")" sparkle:os="${OS}" length="$(stat -c %s ${PACKAGE})" type="application/octet-stream" />
+        </item>
+EOS
+
+if [ -s ${SPARKLE_FILE} ];then
+    gawk -i inplace -v tmp="${TMP_FILE}" '/language/{print; while(getline line < tmp){print line};close(tmp);next}1' ${SPARKLE_FILE}
+    rm -f ${TMP_FILE}
+else
+    echo 'empty SPARKLE_FILE'
+    rm -f ${TMP_FILE}
+    exit 1
+fi