From a0089cb62d50e32565dba1f2ccd33764661c54ca Mon Sep 17 00:00:00 2001
From: Mike <mango@live.cn>
Date: Thu, 4 Jan 2024 15:11:03 +0800
Subject: [PATCH] robust exe path detection (#23)

---
 src/CMakeLists.txt |  3 ++-
 src/apps/cli.cpp   | 32 +++++++++++++++++++++++---------
 2 files changed, 25 insertions(+), 10 deletions(-)

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 652d503a..db7409c3 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -28,6 +28,7 @@ if (CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
             /Zc:preprocessor)
 endif ()
 
+set(LUISA_COMPUTE_BUILD_TESTS OFF CACHE BOOL "" FORCE)
 set(LUISA_COMPUTE_ENABLE_LTO OFF CACHE BOOL "" FORCE)
 set(LUISA_COMPUTE_ENABLE_PYTHON OFF CACHE BOOL "" FORCE)
 set(LUISA_COMPUTE_ENABLE_UNITY_BUILD ${LUISA_RENDER_ENABLE_UNITY_BUILD} CACHE BOOL "" FORCE)
@@ -46,7 +47,7 @@ function(luisa_render_add_plugin name)
     target_compile_definitions(${lib_name} PRIVATE LUISA_RENDER_PLUGIN_NAME="${name}")
     if (${PLUGIN_CATEGORY} STREQUAL "spectrum")
         set(plugin_lib_name luisa-render-spectra)
-    elseif(${PLUGIN_CATEGORY} STREQUAL "medium")
+    elseif (${PLUGIN_CATEGORY} STREQUAL "medium")
         set(plugin_lib_name luisa-render-media)
     else ()
         set(plugin_lib_name luisa-render-${PLUGIN_CATEGORY}s)
diff --git a/src/apps/cli.cpp b/src/apps/cli.cpp
index a5413334..ce15ad9b 100644
--- a/src/apps/cli.cpp
+++ b/src/apps/cli.cpp
@@ -13,10 +13,10 @@
 #include <base/scene.h>
 #include <base/pipeline.h>
 
-#ifdef LUISA_PLATFORM_WINDOWS
+#if defined(LUISA_PLATFORM_WINDOWS)
 #include <windows.h>
 [[nodiscard]] auto get_current_exe_path() noexcept {
-    constexpr auto max_path_length = static_cast<size_t>(4096);
+    constexpr auto max_path_length = std::max<size_t>(MAX_PATH, 4096);
     std::filesystem::path::value_type path[max_path_length] = {};
     auto nchar = GetModuleFileNameW(nullptr, path, max_path_length);
     if (nchar == 0 ||
@@ -27,18 +27,32 @@
     }
     return std::filesystem::canonical(path).string();
 }
-#else
+#elif defined(LUISA_PLATFORM_APPLE)
 #include <libproc.h>
 #include <unistd.h>
 [[nodiscard]] auto get_current_exe_path() noexcept {
-    char pathbuf[PROC_PIDPATHINFO_MAXSIZE];
+    char pathbuf[PROC_PIDPATHINFO_MAXSIZE] = {};
     auto pid = getpid();
-    if (proc_pidpath(pid, pathbuf, sizeof(pathbuf)) <= 0) {
-        LUISA_ERROR_WITH_LOCATION(
-            "Failed to get current executable path (PID = {}): {}.",
-            pid, strerror(errno));
+    if (auto size = proc_pidpath(pid, pathbuf, sizeof(pathbuf)); size > 0) {
+        luisa::string_view path{pathbuf, static_cast<size_t>(size)};
+        return std::filesystem::canonical(path).string();
+    }
+    LUISA_ERROR_WITH_LOCATION(
+        "Failed to get current executable path (PID = {}): {}.",
+        pid, strerror(errno));
+}
+#else
+#include <unistd.h>
+[[nodiscard]] auto get_current_exe_path() noexcept {
+    char pathbuf[PATH_MAX] = {};
+    for (auto p : {"/proc/self/exe", "/proc/curproc/file", "/proc/self/path/a.out"}) {
+        if (auto size = readlink(p, pathbuf, sizeof(pathbuf)); size > 0) {
+            luisa::string_view path{pathbuf, static_cast<size_t>(size)};
+            return std::filesystem::canonical(path).string();
+        }
     }
-    return std::filesystem::canonical(pathbuf).string();
+    LUISA_ERROR_WITH_LOCATION(
+        "Failed to get current executable path.");
 }
 #endif