Container Discord and its update script

Discord.desktop

# .local/share/applications/Discord.desktop
[Desktop Entry]
Name=Discord Chat
Icon=/opt/Discord/discord.png
StartupWMClass=discord
Comment=Discord Chat
Exec=sudo /usr/bin/systemctl start discord@1000.service
Terminal=false
Type=Application
Categories=Network;InstantMessaging;
Path=/usr/bin

discord@.service

# /etc/systemd/user/discord@.service
[Unit]
Description=Discord-App
After=multi-user.target
After=network-online.target
Wants=network-online.target

[Service]
IPAccounting=yes
CPUSchedulingPolicy=batch
IOSchedulingPriority=6
Environment="XDG_RUNTIME_DIR=/run/user/%i" "DISPLAY=:0" "DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/%i/bus"
WorkingDirectory=/opt/Discord
ExecStart=/opt/Discord/Discord
Restart=no
TimeoutStopSec=5s
KillMode=mixed

User=%i
Slice=user-%i.slice
NoNewPrivileges=true
ProtectControlGroups=true
PrivateTmp=yes
ProtectSystem=strict
ProtectHome=tmpfs
BindPaths="/home/mark/.config/discord" "-/home/mark/Pictures" "-/home/mark/Downloads"
BindPaths=/run/user/%i
InaccessiblePaths=-/var/480 -/opt/go
ProtectProc=noaccess
ProcSubset=pid

# Make it more likely that, on low memory, this service gets terminated.
OOMScoreAdjust=500

update-discord.sh

#!/bin/bash
# This /usr/local/sbin/update-discord.sh will update the Discord in /opt/Discord
set -eupo pipefail

if [[ -t 1 ]] && command -v 'tput' &>/dev/null && tput colors >&/dev/null; then
  V_BOLD_RED=$(tput bold; tput setaf 1)
  V_BOLD_GREEN=$(tput bold; tput setaf 2)
  V_VIDOFF=$(tput sgr0)
else
  V_BOLD_RED=''
  V_BOLD_GREEN=''
  V_VIDOFF=''
fi
info() {
  printf "${V_BOLD_GREEN}${1}${V_VIDOFF}\n"
}
error() {
  >&2 printf "${V_BOLD_RED}${1}${V_VIDOFF}\n"
}

: ${D:="/opt/Discord"}
: ${PV:="0.0.14"}
if [[ -s "${D}/resources/build_info.json" ]]; then
  read -r PV < <(<"${D}/resources/build_info.json" jq -r '.version')
fi
declare -r OLDPV="$PV"

next_pv=()
next_versions() {
  local parts
  parts=(${1//./ })
  next_pv+=(
    "$(( ${parts[0]} + 1 )).0.0"
    "${parts[0]}.$(( ${parts[1]} +1 )).0"
    "${parts[0]}.${parts[1]}.$(( ${parts[2]} + 1 ))"
  )
}
next_versions "${OLDPV}"

for PV in "${next_pv[@]}" ${OLDPV}; do
  download_url="https://dl.discordapp.net/apps/linux/${PV}/discord-${PV}.tar.gz"
  if curl -fsS --head "${download_url}" &>/dev/null; then
    break
  fi
done

if [[ "${OLDPV}" == "${PV}" ]]; then
  error "Local version already is at '${PV}'. Exiting."
  exit 0
fi

info "Starting upsert to: ${PV}"
echo $PV ${download_url}

WORKDIR=$(mktemp -d)
trap "rm -rf '${WORKDIR}'" ERR EXIT
curl --fail --location --progress-bar \
  "${download_url}" \
| tar --no-same-owner --strip-components=1 -C "${WORKDIR}/" -xz

rm --one-file-system -rf "${D}"/[a-zA-Z]*
mv "${WORKDIR}"/* "${D}"/

info "Done!"

exit 0