myscripts/install-discord-linux.sh

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#!/usr/bin/bash
######################################################################################
# install-discord-linux.sh #
######################################################################################
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# Description # #
############### #
# #
# This script was created to automate the install of discord on your system. #
# It installs it separately from a package manager (snap, apt, dnf, etc), so this #
# can be used to install it on any linux system regardless of distro #
# as long as the OS & processor supports it. #
# #
# This script was originally just setup to handle installing or updating the #
# existing installation. It can be setup in crontab to handle it automatically so #
# you never have to manually do it again. All you have to do is add it to your #
# crontab to run daily or hourly (assuming you have a cron service installed) #
# #
# EX: #
# """ #
# CRONTAB="$(crontab -l)" #
# if [[ $? -eq 0 ]]; then #
# CRONTAB+="\n0 0 * * * /path/to/script.sh" #
# echo -e "$CRONTAB" | crontab - #
# else #
# echo "0 0 * * * /path/to/script.sh" | crontab - #
# fi #
# """ #
# #
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# Eventually I am wanting this script to also provide additional functionalities: #
# - Install BetterDiscord #
# - Handle multiple installations of discord (makes named config directories #
# and will symlink them based on what "profile" you want to use). This will also #
# allow you to have a installation that contains mods and others without. #
# - Handle manual configurations of discord (where applicable) #
# #
######################################################################################
# Dependencies # #
################ #
# #
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# 1) curl #
# 2) bash (of course) #
# #
######################################################################################
# BEGIN: Variables
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DEBUG=1
ACTION=""
DOWNLOAD_URL='https://discord.com/api/download/stable?platform=linux&format=tar.gz'
VERSION_REGEX='[0-9]+\.[0-9]+\.[0-9]+'
INSTALL_DIR=~/.opt
[[ ! -d $INSTALL_DIR ]] && mkdir -p $INSTALL_DIR
LOCAL_APPLICATION_DIR=~/.local/share/applications
EXISTING_INSTALL=$INSTALL_DIR/Discord
BUILD_FILE=$EXISTING_INSTALL/resources/build_info.json
DESKTOP_FILE=$EXISTING_INSTALL/discord.desktop
INSTALLED_DESKTOP_FILE=$LOCAL_APPLICATION_DIR/discord.desktop
PACKAGE_DOWNLOAD_URL_BASE='https://dl.discordapp.net/apps/linux/{VERSION}/discord-{VERSION}.tar.gz'
ICON_DIR=~/.local/share/icons
DESKTOP_FILE_NEEDS_UPDATE=0
REMOVE_AFTER_INSTALL=1
# END: Variables
# BEGIN: Helper Functions
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function log () {
if [[ $DEBUG -eq 1 ]]; then
local DATE=`date`
local MESSAGE="${1:?"log: Message not provided"}"
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echo "$DATE : $MESSAGE"
fi
}
function get_remote_version(){
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local REMOTE_VERSION=`curl -s $DOWNLOAD_URL | grep -Eo $VERSION_REGEX | head -n 1`
if [[ "$REMOTE_VERSION" ]]; then
echo "$REMOTE_VERSION"
return 0
else
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log "error: remote version not found"
return 1
fi
}
function do_download(){
local VERSION="${1:?"do_download : Version was not provided"}"
## If the provided version doesn't match the format #.#.#
if [[ ! "$VERSION" =~ ^$VERSION_REGEX$ ]]; then
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log "do_download : the version ($VERSION) provided, does not match format $VERSION_REGEX."
exit 2
fi
## Making the URL to download the package
### replacing all {VERSION} in PACKAGE_DOWNLOAD_URL_BASE with $REMOTE_VERSION using string substitution
PACKAGE_DOWNLOAD_URL="${PACKAGE_DOWNLOAD_URL_BASE//\{VERSION\}/$REMOTE_VERSION}"
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log "Download url created ($PACKAGE_DOWNLOAD_URL)"
## Getting filename from url
### Removing all characters from the last / back to leave only the filename
FILENAME="${PACKAGE_DOWNLOAD_URL/*\/}"
## Downloading the discord package (tar.gz)
curl "$PACKAGE_DOWNLOAD_URL" -o "$FILENAME"
log "File was downloaded as $FILENAME"
}
function update_desktop_file() {
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log "Updating desktop file"
## Desktop file in the current/new install
DESKTOP_FILE=$EXISTING_INSTALL/discord.desktop
## Escaped becuase it would mess up the replacement syntax
PATH_TO_REPLACE=\/usr\/bin
PATH_REPLACEMENT=$EXISTING_INSTALL
## Escaped becuase it would mess up the replacement syntax
EXEC_TO_REPLACE=\/usr\/share\/discord\/Discord
EXEC_REPLACEMENT=$EXISTING_INSTALL/Discord
## Loading the desktop file contents into a variable to use replacement without sed
DESKTOP_FILE_CONTENTS="$(<$DESKTOP_FILE)"
## Replacing Path
DESKTOP_FILE_CONTENTS="${DESKTOP_FILE_CONTENTS/$PATH_TO_REPLACE/$PATH_REPLACEMENT}"
## Replacing Exec
DESKTOP_FILE_CONTENTS="${DESKTOP_FILE_CONTENTS/$EXEC_TO_REPLACE/$EXEC_REPLACEMENT}"
## Pushing replacement values to desktop file
echo -e "$DESKTOP_FILE_CONTENTS" > $DESKTOP_FILE
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log "Desktop file has been updated"
}
function remove_installer () {
if [[ $REMOVE_AFTER_INSTALL -eq 1 ]]; then
rm -f $FILENAME
fi
}
function do_install() {
cd "$INSTALL_DIR"
REMOTE_VERSION=`get_remote_version`
do_download "$REMOTE_VERSION"
## Error handling in case curl couldn't do the download (or error in script)
if [[ -f $FILENAME ]]; then
tar xf "$FILENAME"
else
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log "$FILENAME failed to download. Exiting now"
exit 3
fi
update_desktop_file
[[ ! -d $ICON_DIR ]] && mkdir -p $ICON_DIR
cp $EXISTING_INSTALL/discord.png $ICON_DIR/
remove_installer
}
function do_upgrade(){
cd "$INSTALL_DIR"
REMOTE_VERSION=`get_remote_version`
do_download "$REMOTE_VERSION"
## FILENAME provided by do_download
FILENAME="${FILENAME:?"do_upgrade : FILENAME not set by do_download"}"
tar xf "$FILENAME"
update_desktop_file
remove_installer
}
# END: Helper Functions
# BEGIN: Pre-Work Check
if [[ -d $EXISTING_INSTALL ]] && [[ -f $BUILD_FILE ]]; then
LOCAL_VERSION=`grep -Eo $VERSION_REGEX $BUILD_FILE`
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log "Local version was found to be ($LOCAL_VERSION)"
else
ACTION=INSTALL
fi
REMOTE_VERSION=`get_remote_version`
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log "Retrieved remote version ($REMOTE_VERSION)"
# END: Pre-Work Check
# BEGIN: Work
## If ACTION hasn't already been set
if [[ ! $ACTION ]]; then
## Use read to get version numbers in arrays
OIFS=$IFS
IFS='.'
read -a local_versions <<< "$LOCAL_VERSION"
read -a remote_versions <<< "$REMOTE_VERSION"
IFS=$OIFS
## Check if the remote version is greater than the local
for (( i=0; i<3; i++)); do
## If at any point the remote version is greater than the local this will break and set NEEDS_UPGRADE flag
if [[ ${local_versions[$i]} -lt ${remote_versions[$i]} ]]; then
ACTION=UPGRADE
break
fi
done
fi
case $ACTION in
INSTALL)
do_install
;;
UPGRADE)
do_upgrade
;;
esac
# END: Work
# BEGIN: End Work Check
## If discord isn't already setup, go ahead and mark it for install/update
if [[ ! -f $INSTALLED_DESKTOP_FILE ]]; then
log "Desktop file not found in the local applications dir ($LOCAL_APPLICATION_DIR) installing now"
DESKTOP_FILE_NEEDS_UPDATE=1
else
# If there is a change for any reason update it
if [[ "$(<$DESKTOP_FILE)" != "$(<$INSTALLED_DESKTOP_FILE)" ]]; then
log "Desktop file for new version of discord has changed. Updating the existing installation"
DESKTOP_FILE_NEEDS_UPDATE=1
fi
fi
if [[ $DESKTOP_FILE_NEEDS_UPDATE -eq 1 ]]; then
log "Updating/Installing desktop file"
desktop-file-install --dir=$LOCAL_APPLICATION_DIR $DESKTOP_FILE
if [[ $? -ne 0 ]]; then
log "There was an issue with installtion"
else
log "Desktop file was successfully installed"
fi
fi
# END: End Work Check