README: Remove runtime shutdown dependency

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

readme.md

@@ -27,8 +27,6 @@ Join us on Matrix over at [#ly-dm:matrix.org](https://matrix.to/#/#ly-dm:matrix.
 
   - xorg-xauth
 
-  - shutdown
-
   - brightnessctl
 
 ### Debian
@@ -180,9 +178,10 @@ On non-systemd systems, you can change the TTY Ly will run on by editing the cor
 
 ```
 # zig build installexe -Dinit_system=runit
-# rm /var/service/lightdm
+# unlink /var/service/lightdm
 # ln -s /etc/sv/ly /var/service/
-# rm /var/service/agetty-tty2
+# touch /etc/sv/agetty-tty2/down
+# unlink /var/service/agetty-tty2
 ```
 
 ### s6

src/auth.zig

@@ -574,7 +574,15 @@ fn executeCmd(global_log_file: *LogFile, allocator: std.mem.Allocator, io: std.I
 fn redirectStandardStreams(global_log_file: *LogFile, io: std.Io, session_log: []const u8, create: bool) !std.Io.File {
     create_session_log_dir: {
         const session_log_dir = std.Io.Dir.path.dirname(session_log) orelse break :create_session_log_dir;
-        std.Io.Dir.cwd().createDirPath(io, session_log_dir) catch |err| {
+
+        var buffer = std.mem.zeroes([std.Io.Dir.max_path_bytes]u8);
+        const len = std.Io.Dir.cwd().realPathFile(io, session_log_dir, &buffer) catch |err| {
+            try global_log_file.err(io, "auth/sys", "failed to resolve path for session log file directory: {s}", .{@errorName(err)});
+            return err;
+        };
+        const resolved_path = buffer[0..len];
+
+        std.Io.Dir.cwd().createDirPath(io, resolved_path) catch |err| {
             try global_log_file.err(io, "auth/sys", "failed to create session log file directory: {s}", .{@errorName(err)});
             return err;
         };

src/main.zig

@@ -149,8 +149,11 @@ pub fn main(init: std.process.Init) !void {
         }
     }
 
-    var gpa = std.heap.DebugAllocator(.{}).init;
-    defer _ = gpa.deinit();
+    var gpa: std.heap.DebugAllocator(.{
+        .never_unmap = builtin.mode == .Debug,
+        .retain_metadata = builtin.mode == .Debug,
+    }) = .init;
+    defer if (gpa.deinit() == .leak) std.log.err("attention please, memory has been leaked!", .{});
 
     state.allocator = gpa.allocator();