Add variables and install script

.gitignore

@@ -0,0 +1,2 @@
+variables.conf
+.disabled

README.md

@@ -5,5 +5,15 @@ This repository contains setup or configuration files for [LibreELEC](https://li
 ### WireGuard VPN setup
 * copy `~/.config/wireguard/wireguard.config.sample` to a new file, and adjust the parameters (see
 https://wiki.libreelec.tv/configuration/wireguard for reference)
+
+### Files
 * `set-resolv-conf.sh` moves last DNS entry up in `/etc/resolv.conf` (is called after VPN initialization)
-* TOFINISH
+* `variables.conf.template` contains examples variables definitions, and should be copied locally to `variables.conf`
+  (with any required modifications).
+* `systemd-templates/` contains Systemd units templates for detecting VPN connection, and apply routes and DNS
+  modifications.
+#### Installation
+* `install.sh` script copies Systemd templates to their destination, and enables trigger.
+
+### TODO
+* Define a trigger

install.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+
+run_directory=$(dirname $(readlink -f "$0"))
+
+source "$run_directory/variables.conf"
+
+if [ -f $run_directory/.disabled ]; then
+  echo "Installation is disabled. Exiting..."
+  exit 0
+fi
+
+echo "Copying Systemd units to system directory..."
+$sudo cp $run_directory/systemd-templates/set-ip-routes.service /etc/systemd/system/
+$sudo sed -i -e "s/PH_DNS/$dns_server/g" /etc/systemd/system/set-ip-routes.service
+$sudo sed -i -e "s:PH_NETWORK:$target_network:g" /etc/systemd/system/set-ip-routes.service
+
+echo "Reloading Systemd..."
+$sudo systemctl daemon-reload
+echo "Enabling timer (not starting it, either do it manually or reboot)..." # TODO replace by new trigger
+$sudo systemctl enable conf-sync.timer
+
+echo "Finished install. Exiting..."
+exit 0

systemd-templates/set-ip-routes.service

@@ -4,6 +4,6 @@ Description=Update IP routes after connecting to VPN
 [Service]
 Type=oneshot
 ExecStart=/usr/sbin/ip route del default dev wg0
-ExecStart=/usr/sbin/ip route add 192.168.0.63 dev wg0
-ExecStart=/usr/sbin/ip route add 192.168.3.0/24 dev wg0
+ExecStart=/usr/sbin/ip route add PH_DNS dev wg0
+ExecStart=/usr/sbin/ip route add PH_NETWORK dev wg0
 ExecStart=/storage/libreelec-conf/set-resolv-conf.sh

variables.conf.template

@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+
+# Copy this file as variables.conf, with the correct values
+
+dns_server=192.168.0.63
+target_network=192.168.3.0/24