Support multiple TTYs with systemd service (closes #102)

Signed-off-by: AnErrupTion <anerruption@disroot.org>

build.zig

@@ -260,8 +260,8 @@ fn install_service(allocator: std.mem.Allocator, patch_map: PatchMap) !void {
             var service_dir = std.fs.cwd().openDir(service_path, .{}) catch unreachable;
             defer service_dir.close();
 
-            const patched_service = try patchFile(allocator, "res/ly.service", patch_map);
-            try installText(patched_service, service_dir, service_path, "ly.service", .{ .mode = 0o644 });
+            const patched_service = try patchFile(allocator, "res/ly@.service", patch_map);
+            try installText(patched_service, service_dir, service_path, "ly@.service", .{ .mode = 0o644 });
         },
         .openrc => {
             const service_path = try std.fs.path.join(allocator, &[_][]const u8{ dest_directory, config_directory, "/init.d" });
@@ -365,7 +365,7 @@ pub fn Uninstaller(uninstall_config: bool) type {
             try deleteFile(allocator, config_directory, "/pam.d/ly", "ly pam file not found");
 
             switch (init_system) {
-                .systemd => try deleteFile(allocator, prefix_directory, "/lib/systemd/system/ly.service", "systemd service not found"),
+                .systemd => try deleteFile(allocator, prefix_directory, "/lib/systemd/system/ly@.service", "systemd service not found"),
                 .openrc => try deleteFile(allocator, config_directory, "/init.d/ly", "openrc service not found"),
                 .runit => try deleteTree(allocator, config_directory, "/sv/ly", "runit service not found"),
                 .s6 => {

readme.md

@@ -111,19 +111,19 @@ command:
 Then, similarly to the previous command, you need to enable the Ly service:
 
 ```
-# systemctl enable ly.service
+# systemctl enable ly@tty2.service
 ```
 
 **Important**: Because Ly runs in a TTY, you **must** disable the TTY service
-that Ly will run on, otherwise bad things will happen. For example, to disable `getty` spawning on TTY 2 (the default TTY on which Ly spawns), you need to
-execute the following command:
+that Ly will run on, otherwise bad things will happen. For example, to disable `getty` spawning on TTY 2, you need to execute the following command:
 
 ```
 # systemctl disable getty@tty2.service
 ```
 
 You can change the TTY Ly will run on by editing the corresponding
-service file for your platform.
+service file for your platform, or on systemd, by enabling the service on
+different TTYs, as is done above.
 
 ### OpenRC
 

res/ly@.service

@@ -1,16 +1,16 @@
 [Unit]
 Description=TUI display manager
 After=systemd-user-sessions.service plymouth-quit-wait.service
-After=getty@tty$DEFAULT_TTY.service
-Conflicts=getty@tty$DEFAULT_TTY.service
+After=getty@%I.service
+Conflicts=getty@%I.service
 
 [Service]
 Type=idle
 ExecStart=$PREFIX_DIRECTORY/bin/$EXECUTABLE_NAME
 StandardInput=tty
-TTYPath=/dev/tty$DEFAULT_TTY
+TTYPath=/dev/%I
 TTYReset=yes
 TTYVHangup=yes
 
 [Install]
-Alias=display-manager.service
+WantedBy=multi-user.target