179 lines
4.3 KiB
Bash
179 lines
4.3 KiB
Bash
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#!/usr/bin/bash
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# BEGIN: Variables
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ACTION=""
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DOWNLOAD_URL='https://discord.com/api/download/stable?platform=linux&format=tar.gz'
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VERSION_REGEX='[0-9]+\.[0-9]+\.[0-9]+'
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INSTALL_DIR=~/Downloads
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EXISTING_INSTALL=$INSTALL_DIR/Discord
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BUILD_FILE=$EXISTING_INSTALL/resources/build_info.json
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PACKAGE_DOWNLOAD_URL_BASE='https://dl.discordapp.net/apps/linux/{VERSION}/discord-{VERSION}.tar.gz'
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ICON_DIR=~/.icons
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# END: Variables
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# BEGIN: Helper Functions
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function get_remote_version(){
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local REMOTE_VERSION=`curl $DOWNLOAD_URL | grep -Eo $VERSION_REGEX | head -n 1`
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if [[ "$REMOTE_VERSION" ]]; then
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echo "$REMOTE_VERSION"
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return 0
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else
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echo "error: remote version not found"
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return 1
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fi
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}
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function do_download(){
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local VERSION="${1:?"do_download : Version was not provided"}"
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## If the provided version doesn't match the format #.#.#
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if [[ ! "$VERSION" =~ ^$VERSION_REGEX$ ]]; then
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echo "do_download : the version ($VERSION) provided, does not match format $VERSION_REGEX."
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exit 2
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fi
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## Making the URL to download the package
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### replacing all {VERSION} in PACKAGE_DOWNLOAD_URL_BASE with $REMOTE_VERSION using string substitution
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PACKAGE_DOWNLOAD_URL="${PACKAGE_DOWNLOAD_URL_BASE//\{VERSION\}/$REMOTE_VERSION}"
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## Getting filename from url
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### Removing all characters from the last / back to leave only the filename
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FILENAME="${PACKAGE_DOWNLOAD_URL/*\/}"
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## Downloading the discord package (tar.gz)
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curl "$PACKAGE_DOWNLOAD_URL" -o "$FILENAME" >/dev/null
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}
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function update_desktop_file() {
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## Desktop file in the current/new install
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DESKTOP_FILE=$EXISTING_INSTALL/discord.desktop
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## Escaped becuase it would mess up the replacement syntax
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PATH_TO_REPLACE=\/usr\/bin
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PATH_REPLACEMENT=$EXISTING_INSTALL
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## Escaped becuase it would mess up the replacement syntax
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EXEC_TO_REPLACE=\/usr\/share\/discord\/Discord
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EXEC_REPLACEMENT=$EXISTING_INSTALL\/Discord
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## Loading the desktop file contents into a variable to use replacement without sed
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DESKTOP_FILE_CONTENTS="$(<$DESKTOP_FILE)"
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## Replacing Path
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DESKTOP_FILE_CONTENTS="${DESKTOP_FILE_CONTENTS/$PATH_TO_REPLACE/$PATH_REPLACEMENT}"
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## Replacing Exec
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DESKTOP_FILE_CONTENTS="${DESKTOP_FILE_CONTENTS/$EXEC_TO_REPLACE/$EXEC_REPLACEMENT}"
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## Pushing replacement values to desktop file
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echo -e "$DESKTOP_FILE_CONTENTS" > $DESKTOP_FILE
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}
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function do_install() {
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cd "$INSTALL_DIR"
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REMOTE_VERSION=`get_remote_version`
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do_download "$REMOTE_VERSION"
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## Error handling in case curl couldn't do the download (or error in script)
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if [[ -f $FILENAME ]]; then
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tar xf "$FILENAME"
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else
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echo "$FILENAME failed to download. Exiting now"
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exit 1
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fi
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update_desktop_file
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## If your icon dir (configured above) exists in the env variable
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if [[ "$XDG_DATA_DIRS" != *$ICON_DIR* ]]; then
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export XDG_DATA_DIRS=$XDG_DATA_DIRS:$ICON_DIR
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if [[ $SHELL == *bash ]]; then
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echo 'export XDG_DATA_DIRS=$XDG_DATA_DIRS':$ICON_DIR > ~/.bashrc
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else
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echo 'export XDG_DATA_DIRS=$XDG_DATA_DIRS':$ICON_DIR > ~/.profile
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fi
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fi
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[[ ! -d $ICON_DIR ]] && mkdir -p $ICON_DIR
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cp $EXISTING_INSTALL/discord.png $ICON_DIR/
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desktop-file-isntall $DESKTOP_FILE
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}
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function do_upgrade(){
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cd "$INSTALL_DIR"
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REMOTE_VERSION=`get_remote_version`
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do_download "$REMOTE_VERSION"
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## FILENAME provided by do_download
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FILENAME="${FILENAME:?"do_upgrade : FILENAME not set by do_download"}"
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tar xf "$FILENAME"
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update_desktop_file
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}
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# END: Helper Functions
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# BEGIN: Pre-Work Check
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if [[ -d $EXISTING_INSTALL ]] && [[ -f $BUILD_FILE ]]; then
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LOCAL_VERSION=`grep -Eo $VERSION_REGEX $BUILD_FILE`
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else
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ACTION=INSTALL
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fi
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REMOTE_VERSION=`curl $DOWNLOAD_URL | grep -Eo $VERSION_REGEX | head -n 1`
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# END: Pre-Work Check
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# BEGIN: Work
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## If ACTION hasn't already been set
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if [[ ! $ACTION ]]; then
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## Use read to get version numbers in arrays
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OIFS=$IFS
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IFS='.'
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read -a local_versions <<< "$LOCAL_VERSION"
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read -a remote_versions <<< "$REMOTE_VERSION"
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IFS=$OIFS
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## Check if the remote version is greater than the local
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for (( i=0; i<3; i++)); do
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## If at any point the remote version is greater than the local this will break and set NEEDS_UPGRADE flag
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if [[ ${local_versions[$i]} -lt ${remote_versions[$i]} ]]; then
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ACTION=UPGRADE
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break
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fi
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done
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fi
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case $ACTION in
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INSTALL)
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do_install
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;;
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UPGRADE)
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do_upgrade
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;;
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esac
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# END: Work
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