rename update_riot script

usr/local/bin/update_element.sh

@@ -0,0 +1,46 @@
+#!/usr/bin/env bash
+
+[[ ! -d /opt/element/resources ]] && mkdir -p /opt/element/resources
+cd /opt/element/resources
+
+old_version="v$(cat webapp/version)"
+
+version="latest"
+if [[ ! -z "$1" ]]; then
+	version="tags/$1"
+fi
+
+echo "Fetching latest release info from GitHub"
+version_info=$(curl -s "https://api.github.com/repositories/39487546/releases/$version")
+new_version=$(echo "$version_info" | jq -r '.name')
+URL=$(echo "$version_info" | jq -r '.assets[0].browser_download_url')
+
+if [[ "$new_version" == "$old_version" ]]; then
+	echo "No updates found"
+	exit
+fi
+
+# Remove previous backup element
+rm -rf element.bak
+
+# Create temp directory for new element
+mkdir element.new
+cd element.new
+
+echo "Downloading element $new_version"
+curl -L "$URL" -o element-tmp.tar.gz
+
+echo "Unpacking archive"
+tar -xzf element-tmp.tar.gz --strip-components=1
+rm -f element-tmp.tar.gz
+
+echo "Replacing files"
+cd ..
+cp -f webapp/config.json element.new/config.json
+# Back up old version and activate new version
+mv webapp webapp.bak
+mv element.new webapp
+
+echo "Updated to element from $old_version to $new_version"
+
+exit 0