doc(linux GUI): install script

[ReactorScram]

Before merging

Beta Give feedback

1. Someone other than me should test it

We could get rid of this* if we use a post-install script in the deb package. But Tauri's deb bundler doesn't support that, so we'd need to switch to cargo-deb. I'd really like to do that and use build.rs or something instead of build.bat and build.sh, but it's a big time sink.

*The adduser step probably should be manual, but systemctl and groupadd can be done in a post-install script.

#!/usr/bin/env bash
# Usage: bash firezone-setup.bash firezone-client-gui_VERSION_ARCH.deb
# This script should be idempotent
set -euox pipefail

echo "Adding your user to the firezone group..."
sudo groupadd --force firezone
sudo adduser "$USER" firezone

echo "Installing Firezone..."
sudo apt install "$1"

echo "Starting and enabling Firezone IPC service..."
sudo systemctl enable --now firezone-client-ipc

# Unfortunately Ubuntu seems to need a reboot here, at least 20.04 does
echo "Reboot to finish adding yourself to the group"

[thomaseizinger]

Users can be added declaratively too if we already have systemd as a prerequisite.

https://www.freedesktop.org/software/systemd/man/latest/sysusers.d.html

[jamilbk]

@ReactorScram We do this for Gateways -- See https://github.com/firezone/firezone/blob/main/scripts/gateway-systemd-install.sh#L26

[ReactorScram]

@jamilbk Hm, so that creates both a user and group "firezone". I only need the group, but maybe I should use "firezone-client" instead.

btw if you set User and Group in systemd you could probably drop that entire sudo command:

firezone/rust/gui-client/src-tauri/firezone-client-ipc.service

Lines 46 to 47 in 9606dde

	User=root
	Group=firezone