feat: check if profile prefix is in a partition with nosuid, add warning in main view

Cargo.toml

@@ -14,7 +14,9 @@ gtk4 = { version = "0.6.6", features = [
     "v4_10",
 ] }
 libusb = "0.3.0"
-nix = "0.26.2"
+nix = { version = "0.26.2", features = [
+    "fs"
+] }
 phf = "0.11.1"
 phf_macros = "0.11.1"
 relm4 = { version = "0.6.0", features = [

src/file_utils.rs

@@ -1,6 +1,6 @@
-use crate::{constants::CMD_NAME, runner::Runner};
+use crate::runner::Runner;
+use nix::{sys::statvfs::{statvfs, FsFlags}, errno::Errno};
 use std::{
-    env,
     fs::{self, copy, create_dir_all, remove_dir_all, File, OpenOptions},
     io::{BufReader, BufWriter},
     path::Path,
@@ -93,6 +93,25 @@ pub fn copy_file(source_s: &String, dest_s: &String) {
             );
         }
     }
-    set_file_readonly(dest_s, false);
+    set_file_readonly(dest_s, false)
+        .expect(format!("Failed to set file {} as rw", dest_s).as_str());
     copy(source, dest).expect(format!("Failed to copy {} to {}", source_s, dest_s).as_str());
 }
+
+pub fn mount_has_nosuid(path_s: &str) -> Result<bool, Errno> {
+    let path = Path::new(path_s);
+    match statvfs(path) {
+        Ok(fstats) => Ok(fstats.flags().contains(FsFlags::ST_NOSUID)),
+        Err(e) => Err(e)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::file_utils::mount_has_nosuid;
+
+    #[test]
+    fn can_get_nosuid() {
+        assert_eq!(mount_has_nosuid("/tmp").expect("Error running statvfs"), true);
+    }
+}

src/ui/main_view.rs

@@ -5,6 +5,7 @@ use super::profile_editor::{ProfileEditor, ProfileEditorMsg, ProfileEditorOutMsg
 use super::steam_launch_options_box::{SteamLaunchOptionsBox, SteamLaunchOptionsBoxMsg};
 use crate::config::Config;
 use crate::constants::APP_NAME;
+use crate::file_utils::mount_has_nosuid;
 use crate::profile::Profile;
 use crate::ui::app::{
     AboutAction, BuildProfileAction, BuildProfileCleanAction, DebugViewToggleAction,
@@ -181,6 +182,59 @@ impl SimpleComponent for MainView {
                         },
                     },
                     model.devices_box.widget(),
+                    gtk::Box {
+                        set_orientation: gtk::Orientation::Vertical,
+                        set_hexpand: true,
+                        set_vexpand: false,
+                        set_spacing: 12,
+                        set_margin_top: 12,
+                        set_margin_bottom: 12,
+                        #[track = "model.changed(Self::selected_profile())"]
+                        set_visible: match mount_has_nosuid(model.selected_profile.prefix.as_str()) {
+                            Ok(b) => b,
+                            Err(_) => {
+                                // TODO: handle this error better
+                                println!(
+                                    "Warning: could not get stat on path {}",
+                                    model.selected_profile.prefix);
+                                false
+                            },
+                        },
+                        gtk::Separator {
+                            set_orientation: gtk::Orientation::Horizontal,
+                            set_hexpand: true,
+                        },
+                        gtk::Box {
+                            set_orientation: gtk::Orientation::Horizontal,
+                            set_margin_start: 12,
+                            set_margin_end: 12,
+                            set_spacing: 12,
+                            set_hexpand: true,
+                            gtk::Image {
+                                set_icon_name: Some("dialog-warning-symbolic"),
+                                add_css_class: "warning",
+                            },
+                            gtk::Label {
+                                add_css_class: "warning",
+                                add_css_class: "heading",
+                                set_label: "Warning"
+                            }
+                        },
+                        gtk::Label {
+                            set_label: concat!(
+                                "Your current prefix is inside a partition ",
+                                "mounted with the nosuid option. This will prevent ",
+                                "the Rex2 runtime from acquiring certain privileges ",
+                                "and will cause noticeable stutter when running XR ",
+                                "applications."
+                            ),
+                            set_margin_start: 12,
+                            set_margin_end: 12,
+                            add_css_class: "warning",
+                            set_wrap: true,
+                            set_wrap_mode: gtk::pango::WrapMode::Word,
+                        }
+                    },
                     model.steam_launch_options_box.widget(),
                     model.install_wivrn_box.widget(),
                     gtk::Box {