feat(menu): allow overriding admin console URL via TAILRAY_ADMIN_URL

Author: NotAShelf

README.md

@@ -2,13 +2,35 @@
 
 A modern and fast implementation of tailscale-systray in Rust.
 
-> [!NOTE] Tailray is a work in progress. Most things don't work, or work in a
-> degraded state. If you find bugs that are not aggressed in the issues tab,
-> feel free to create a new issue or a pull request! You are advi
+<!-- deno-fmt-ignore-start -->
+
+## Usage
+
+> [!NOTE]
+> Tailray is a work in progress. Most things don't work, or work in a
+> degraded state. If you find bugs that are not addressed in the issues tab,
+> feel free to create a new issue or a pull request!
+
+<!-- deno-fmt-ignore-end -->
+
+Tailray requires Tailscaled to be up and running. On Linux systems, you can
+check its status with `systemctl status tailscaled`.
+
+After you confirm that Tailscale is running, and that you are authenticated run
+`tailray` from a terminal or consider writing a systemd service for it.
+
+### Overriding Admin Console URL
+
+Tailray will assume `https://login.tailscale.com/admin/machines` to be the Admin
+Console URL by default. You may override this URL by setting `TAILRAY_ADMIN_URL`
+to an URL of your choice.
 
 ## Hacking
 
-Simply run `nix develop` in the project root.
+The recommended way of building Tailray is with the Nix build tool. You may run
+`nix develop` in the repository to enter a devShell with the necessary
+dependencies. Direnv users may also use `direnv allow` to let direnv handle
+their shell environment.
 
 ## License
 

src/tray/menu.rs

@@ -220,7 +220,10 @@ impl Tray for SysTray {
             StandardItem {
                 label: "Admin Console…".into(),
                 activate: Box::new(|_| {
-                    if let Err(e) = open::that("https://login.tailscale.com/admin/machines") {
+                    let admin_url = std::env::var("TAILRAY_ADMIN_URL").unwrap_or_else(|_| {
+                        "https://login.tailscale.com/admin/machines".to_string()
+                    });
+                    if let Err(e) = open::that(admin_url.as_str()) {
                         eprintln!("failed to open admin console: {}", e);
                     }
                 }),