gaming: lightforge

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

patches/lightforge-nix-origin.patch

@@ -0,0 +1,60 @@
+diff --git a/crates/core/src/upgrade/mod.rs b/crates/core/src/upgrade/mod.rs
+index c5f3b87..c4fdd34 100644
+--- a/crates/core/src/upgrade/mod.rs
++++ b/crates/core/src/upgrade/mod.rs
+@@ -56,6 +56,9 @@ pub enum Origin {
+     Checkout { repo: PathBuf },
+     /// `cargo install`.
+     Cargo,
++    /// A Nix package, run from the store: Nix updates it with the rest of
++    /// the system or profile.
++    Nix,
+     /// None of these.
+     Unknown,
+ }
+@@ -73,6 +76,10 @@ impl Origin {
+     /// where the system's own directories are read from.
+     pub fn detect_at(exe: &Path, home: &Path, cargo_home: Option<&Path>, root: &Path) -> Self {
+         let bin_dir = exe.parent().unwrap_or(Path::new("/"));
++        // Read-only and owned by Nix, whichever profile or wrapper started it.
++        if exe.starts_with("/nix/store") {
++            return Self::Nix;
++        }
+         if bin_dir == home.join(".local/bin") {
+             return Self::Installer { bin_dir: bin_dir.to_path_buf() };
+         }
+@@ -154,6 +161,11 @@ impl Origin {
+                 )],
+                 note: "This Lightforge was installed with cargo.".to_owned(),
+             },
++            Self::Nix => say(
++                &[],
++                "Lightforge comes from Nix, which updates it: once the package or flake \
++                 input has the new version, rebuild your system or profile.",
++            ),
+             Self::Unknown => say(
+                 &[INSTALLER_COMMAND],
+                 "Lightforge cannot tell how it was installed here. The installer puts it \
+@@ -326,6 +338,10 @@ mod tests {
+         );
+         assert_eq!(detect("/home/u/.cargo/bin/lightforge-gui", &empty), Origin::Cargo);
+         assert_eq!(detect("/opt/lightforge/lightforge-gui", &empty), Origin::Unknown);
++        assert_eq!(
++            detect("/nix/store/00000000000000000000000000000000-lightforge/bin/lightforge-gui", &empty),
++            Origin::Nix
++        );
+         let _ = std::fs::remove_dir_all(&empty);
+     }
+ 
+diff --git a/crates/launcher-gui/src/tests.rs b/crates/launcher-gui/src/tests.rs
+index 79c7465..e089466 100644
+--- a/crates/launcher-gui/src/tests.rs
++++ b/crates/launcher-gui/src/tests.rs
+@@ -1190,6 +1190,7 @@ fn the_update_card_draws_for_every_route_and_stage() {
+         Origin::Deb,
+         Origin::Copr { atomic: true },
+         Origin::Checkout { repo: "/home/u/lightforge".into() },
++        Origin::Nix,
+         Origin::Unknown,
+     ];
+     let stages = [