publish discord auto updater

update-discord.sh

@@ -0,0 +1,50 @@
+#!/bin/bash
+
+################
+# CHANGE THESE #
+################
+
+# path to your build_info.json file; include the file name
+DISCORD_BUILD_INFO_PATH="/usr/share/discord/resources/build_info.json"
+
+# for debian-based linux distributions (.deb installers)
+DISCORD_PLATFORM="linux"
+DISCORD_FORMAT="deb"
+
+###########################
+# DON'T CHANGE THIS STUFF #
+###########################
+
+# check for sudo
+if [ $(id -g) -ne 0 ]; then
+	echo "Please run as sudo"
+	exit 2
+fi
+
+apt-get update && apt-get install -y jq
+
+# get currently installed version of Discord
+ver_current=$(jq -r ".version" "$DISCORD_BUILD_INFO_PATH")
+echo "Discord version $ver_current installed"
+
+# check latest available Discord version by looking at the headers of the latest Discord download URL
+pre_ver_available=$(curl -s -I "https://discord.com/api/download?platform=$DISCORD_PLATFORM&format=$DISCORD_FORMAT" | grep location)
+
+# trim everything before and after the version number
+ver_available="${pre_ver_available#*linux/}"
+ver_available="${ver_available%/*}"
+
+echo "Discord version $ver_available available"
+
+if [ "$ver_current" = "$ver_available" ] ; then
+	echo "Discord is up to date!"
+	exit 0
+fi
+
+echo "Discord is not up to date, editing $DISCORD_BUILD_INFO_PATH"
+
+jq ".version = \"$ver_available\"" $DISCORD_BUILD_INFO_PATH > discord_build_info_tmp.json
+chmod 644 discord_build_info_tmp.json
+mv discord_build_info_tmp.json "$DISCORD_BUILD_INFO_PATH"
+
+killall Discord