From 42e5b0784def554447e9fb7014f19d03cdadc29f Mon Sep 17 00:00:00 2001
From: cnc <cnc@localhost>
Date: Sat, 6 Jun 2026 12:53:40 +0800
Subject: [PATCH] =?UTF-8?q?=E6=8C=89=E6=BA=90=E9=AA=8C=E8=AF=81Python?=
 =?UTF-8?q?=E6=8F=92=E4=BB=B6=E8=B7=AF=E5=BE=84=E8=8A=82=E8=BE=B9=E7=95=8C?=
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源依据：LinuxCNC src/emc/pythonplugin/python_plugin.cc 的 configure() 按调用方 section 查找 TOPLEVEL，但 PATH_APPEND 固定从 PYTHON section 逐项读取并在 tilde expansion 失败时返回 PLUGIN_EXCEPTION_DURING_PATH_APPEND。

结论：wasm-safe python_plugin standalone probe 增加 REMAP/PYTHON section 分离边界，确认禁用 Python 时仍保留 LinuxCNC 的 INI 查找顺序和失败状态，不引入浏览器端 Python 执行。

检查：./test-linuxcnc-wasm-python-plugin-link.sh；./test-native.sh；./test-linuxcnc-source-link.sh。
---
 .../pythonplugin/python_plugin_probe_main.cc  | 38 +++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/core/wasm_shims/pythonplugin/python_plugin_probe_main.cc b/core/wasm_shims/pythonplugin/python_plugin_probe_main.cc
index 34ea018..4afa074 100644
--- a/core/wasm_shims/pythonplugin/python_plugin_probe_main.cc
+++ b/core/wasm_shims/pythonplugin/python_plugin_probe_main.cc
@@ -198,6 +198,44 @@ int main() {
         setenv("HOME", saved_home_value.c_str(), 1);
     }
     std::remove(path_append_ini);
+    const char *section_path_append_ini = "/tmp/cnc_sim_python_plugin_probe_section_path_append.ini";
+    {
+        FILE *file = std::fopen(section_path_append_ini, "w");
+        if (!file) {
+            std::remove(ini);
+            return 50;
+        }
+        std::fputs("[REMAP]\n"
+                   "[PYTHON]\nTOPLEVEL = /tmp/cnc_sim_missing_python_section_toplevel.py\n"
+                   "PATH_APPEND = ~/linuxcnc-python\n",
+                   file);
+        std::fclose(file);
+    }
+    unsetenv("HOME");
+    // LinuxCNC source basis: python_plugin.cc configure() looks up TOPLEVEL in
+    // the caller-provided section, but PATH_APPEND entries are read from the
+    // fixed PYTHON section before initialize(); a PYTHON TOPLEVEL is ignored
+    // when the caller configures a different section.
+    if (plugin->configure(section_path_append_ini, "REMAP") != PLUGIN_EXCEPTION_DURING_PATH_APPEND) {
+        if (saved_home) {
+            setenv("HOME", saved_home_value.c_str(), 1);
+        }
+        std::remove(ini);
+        std::remove(section_path_append_ini);
+        return 51;
+    }
+    if (plugin->last_errmsg() != "bad path append") {
+        if (saved_home) {
+            setenv("HOME", saved_home_value.c_str(), 1);
+        }
+        std::remove(ini);
+        std::remove(section_path_append_ini);
+        return 52;
+    }
+    if (saved_home) {
+        setenv("HOME", saved_home_value.c_str(), 1);
+    }
+    std::remove(section_path_append_ini);
     const char *plain_path_ini = "/tmp/cnc_sim_python_plugin_probe_plain_path.ini";
     {
         FILE *file = std::fopen(plain_path_ini, "w");