Install Tailscale on Steam Deck ft. SquashFS & systemd-sysext

tailscale-install.sh

#!/usr/bin/env bash
# -----------------------------------------------------------------------------
#   _____      _ _               _                          
#  /__   \__ _(_) |___  ___ __ _| | ___                     
#    / /\/ _` | | / __|/ __/ _` | |/ _ \                    
#   / / | (_| | | \__ \ (_| (_| | |  __/                    
#   \/   \____|_|_|___/\___\__,_|_|\___|          _           _    
#    ,d88b.d88b,  / _\ |_ ___  __ _ _ __ ___   __| | ___  ___| | __
#    88888888888  \ \| __/ _ \/ _` | '_ ` _ \ / _` |/ _ \/ __| |/ /
#    `Y8888888Y'  _\ \ ||  __/ (_| | | | | | | (_| |  __/ (__|   < 
#      `Y888Y'    \__/\__\___|\__,_|_| |_| |_|\__,_|\___|\___|_|\_\
#        `Y'    
#
#  reference:              
#   → https://tailscale.com/blog/steam-deck
#   → https://blogs.igalia.com/berto/2022/09/13/adding-software-to-the-steam-deck-with-systemd-sysext/
#
# -----------------------------------------------------------------------------

set -euo pipefail

ext_dir="$HOME/.local/extensions"
dir="$(mktemp -d)"
pushd .
cd "${dir}"

tarball="$(curl 'https://pkgs.tailscale.com/stable/?mode=json' | jq -r .Tarballs.amd64)"
version="$(echo ${tarball} | cut -d_ -f2)"

curl "https://pkgs.tailscale.com/stable/${tarball}" -o tailscale.tgz

mkdir -p tailscale/usr/{bin,sbin,lib/{systemd/system,extension-release.d}}
tar xzf tailscale.tgz

cp -vrf "tailscale_${version}_amd64"/tailscale tailscale/usr/bin/tailscale
cp -vrf "tailscale_${version}_amd64"/tailscaled tailscale/usr/sbin/tailscaled
cp -vrf "tailscale_${version}_amd64"/systemd/tailscaled.service tailscale/usr/lib/systemd/system/tailscaled.service

sed -i 's/--port.*//g' tailscale/usr/lib/systemd/system/tailscaled.service

source /etc/os-release
echo -e "SYSEXT_LEVEL=1.0\nID=steamos\nVERSION_ID=${VERSION_ID}" >> tailscale/usr/lib/extension-release.d/extension-release.tailscale

if [ ! -h "/var/lib/extensions" ]; then
  mkdir -p "$ext_dir"
  sudo ln -fsv "$ext_dir" /var/lib/extensions
fi

sudo rm -fv "$ext_dir/tailscale.raw"
mksquashfs tailscale "$ext_dir/tailscale.raw"

if [ ! -f "/etc/default/tailscaled" ]; then
  mkdir -p /etc/default
  sudo touch /etc/default/tailscaled
fi

popd
rm -rf "${dir}"

sudo systemctl enable --now systemd-sysext
sudo systemd-sysext merge || sudo systemd-sysext refresh

sudo systemctl daemon-reload
sudo systemctl restart tailscaled.service
sudo tailscale up --operator=deck --qr --ssh --accept-dns=false