Improvements to try resolve the issues with login checksums.

ptlinux/doctor.py

@@ -98,6 +98,7 @@ def inspect_host(environment: Mapping[str, str] | None = None) -> DoctorReport:
 			"Vulkan diagnostics",
 		),
 	]
+	tools.extend(_platform_optional_tools(distribution, architecture=platform.machine()))
 	warnings: list[str] = []
 	if platform.machine().casefold() not in {"x86_64", "amd64"}:
 		warnings.append("PristonTale EU requires an x86-64 host with 32-bit Vulkan support.")
@@ -107,6 +108,7 @@ def inspect_host(environment: Mapping[str, str] | None = None) -> DoctorReport:
 		warnings.append(
 			"No game runtime was found: install umu-launcher or Steam Proton 7.0."
 		)
+	warnings.extend(_arch_runtime_warnings(distribution, platform.machine()))
 	required_ok = all(item.path is not None for item in tools if item.required)
 	return DoctorReport(
 		ok=required_ok and not any("No game runtime" in warning for warning in warnings),
@@ -158,7 +160,7 @@ def _package_hint(distribution: str) -> str | None:
 	if distribution in {"arch", "cachyos", "endeavouros", "manjaro"}:
 		return (
 			"Install python, tk, wine, winetricks, umu-launcher, cabextract, "
-			"openssl, and the matching lib32 Vulkan driver with Pacman."
+			"openssl, and the matching lib32 Vulkan and gstreamer dependencies with Pacman."
 		)
 	if distribution in {"opensuse-tumbleweed", "opensuse-leap", "suse"}:
 		return (
@@ -182,3 +184,55 @@ def _has_steam_proton7(environment: Mapping[str, str]) -> bool:
 		if (steam_root / "steamapps/common/Proton 7.0/proton").is_file():
 			return True
 	return False
+
+
+def _platform_optional_tools(distribution: str, *, architecture: str) -> list[ToolStatus]:
+	if architecture.casefold() not in {"x86_64", "amd64"}:
+		return []
+	if distribution in {"arch", "cachyos", "endeavouros", "manjaro", "garuda"}:
+		return [
+			_optional_tool_status(
+				"lib32-vulkan",
+				"/usr/lib32/libvulkan.so.1",
+				"32-bit Vulkan runtime compatibility layer",
+			),
+			_optional_tool_status(
+				"lib32-gstreamer",
+				"/usr/lib32/gstreamer-1.0",
+				"32-bit gstreamer runtime compatibility modules",
+			),
+		]
+	return []
+
+
+def _arch_runtime_warnings(distribution: str, architecture: str) -> list[str]:
+	if distribution not in {"arch", "cachyos", "endeavouros", "manjaro", "garuda"}:
+		return []
+	if architecture.casefold() not in {"x86_64", "amd64"}:
+		return [
+			"Non-x86_64 Linux hosts are not a supported runtime architecture for this game."
+		]
+	warnings: list[str] = []
+	if not _path_exists("/usr/lib32/libvulkan.so.1"):
+		warnings.append(
+			"Install lib32-vulkan-icd-loader and the GPU vendor's matching 32-bit "
+			"Vulkan driver; this 32-bit D3D9 client otherwise cannot initialize DXVK."
+		)
+	if not _path_exists("/usr/lib32/gstreamer-1.0"):
+		warnings.append(
+			"Install lib32-gstreamer and lib32-gst-plugins-base if the login video or "
+			"other media does not play. Missing media plugins are not evidence of an "
+			"authentication failure."
+		)
+	return warnings
+
+
+def _optional_tool_status(name: str, path: str, purpose: str) -> ToolStatus:
+	if _path_exists(path):
+		return ToolStatus(name, path, required=False, purpose=purpose)
+	return ToolStatus(name, None, required=False, purpose=purpose)
+
+
+def _path_exists(path: str) -> bool:
+	entry = Path(path)
+	return entry.is_file() or entry.is_dir()