feat: add --no-xwayland argument for running without Xwayland

This leaves the default behavior in place. When --no-xwayland
is not passed, Xwayland is started. If it is passed, then
starting Xwayland is skipped.

src/backend/kms/mod.rs

@@ -168,9 +168,13 @@ pub fn init_backend(
         }
     }
 
+    if state.common.with_xwayland {
         // start x11
         let primary = *state.backend.kms().primary_node.read().unwrap();
         state.launch_xwayland(primary);
+    } else {
+        state.notify_ready();
+    }
 
     Ok(())
 }

src/backend/winit.rs

@@ -241,7 +241,12 @@ pub fn init_backend(
         }
         state.common.refresh();
     }
+
+    if state.common.with_xwayland {
         state.launch_xwayland(None);
+    } else {
+        state.notify_ready();
+    }
 
     Ok(())
 }

src/backend/x11.rs

@@ -384,7 +384,12 @@ pub fn init_backend(
         }
         state.common.refresh();
     }
+
+    if state.common.with_xwayland {
         state.launch_xwayland(None);
+    } else {
+        state.notify_ready();
+    }
 
     event_loop
         .handle()

src/lib.rs

@@ -109,6 +109,7 @@ pub fn run(hooks: crate::hooks::Hooks) -> Result<(), Box<dyn Error>> {
     let mut cursor = raw_args.cursor();
     let git_hash = option_env!("GIT_HASH").unwrap_or("unknown");
 
+    let mut with_xwayland = true;
     // Parse the arguments
     while let Some(arg) = raw_args.next_os(&mut cursor) {
         match arg.to_str() {
@@ -116,6 +117,10 @@ pub fn run(hooks: crate::hooks::Hooks) -> Result<(), Box<dyn Error>> {
                 print_help(env!("CARGO_PKG_VERSION"), git_hash);
                 return Ok(());
             }
+            Some("--no-xwayland") => {
+                tracing::info!("Running without Xwayland");
+                with_xwayland = false;
+            }
             Some("--version") | Some("-V") => {
                 println!(
                     "cosmic-comp {} (git commit {})",
@@ -152,6 +157,7 @@ pub fn run(hooks: crate::hooks::Hooks) -> Result<(), Box<dyn Error>> {
         socket,
         event_loop.handle(),
         event_loop.get_signal(),
+        with_xwayland,
     );
     // init backend
     backend::init_backend_auto(&display, &mut event_loop, &mut state)?;
@@ -240,6 +246,7 @@ Project home page: https://github.com/pop-os/cosmic-comp
 
 Options:
   -h, --help          Show this message
+  --no-xwayland       Run without Xwayland
   -v, --version       Show the version of cosmic-comp"#
     );
 }

src/state.rs

@@ -296,6 +296,8 @@ pub struct Common {
 
     #[cfg(feature = "systemd")]
     pub inhibit_lid_fd: Option<OwnedFd>,
+
+    pub with_xwayland: bool,
 }
 
 #[derive(Debug)]
@@ -626,6 +628,7 @@ impl State {
         socket: OsString,
         handle: LoopHandle<'static, State>,
         signal: LoopSignal,
+        with_xwayland: bool,
     ) -> State {
         let requested_languages = DesktopLanguageRequester::requested_languages();
         i18n_embed::select(&*LANG_LOADER, &Localizations, &requested_languages)
@@ -801,6 +804,8 @@ impl State {
 
                 #[cfg(feature = "systemd")]
                 inhibit_lid_fd: None,
+
+                with_xwayland,
             },
             backend: BackendData::Unset,
             ready: Once::new(),