initial commit

CMakeLists.txt

+cmake_minimum_required(VERSION 3.20)
+
+project(embedded_python_dummy
+  LANGUAGES CXX)
+
+find_package(Python3 REQUIRED COMPONENTS Development)
+
+add_executable(embedded_python_dummy
+  embedded_python_dummy.cxx)
+target_link_libraries(embedded_python_dummy Python3::Python)

embedded_python_dummy.cxx

+#include <iostream>
+#include <stdexcept>
+
+#define PY_SSIZE_T_CLEAN
+#include <Python.h>
+
+int main(int args, char** argv){
+
+  using namespace std::string_literals;
+
+  if(false){  // <- false is the current behavior in libpython_adapter
+    Py_Initialize();
+  }else{
+    PyStatus status;
+    PyConfig config;
+    PyConfig_InitPythonConfig(&config);
+
+    try{
+      config.site_import = 1; // <- en-/dis- able site module
+      status = PyConfig_SetBytesString(&config, &config.program_name,
+                                       argv[0]);
+      if (PyStatus_Exception(status)) {
+        throw status;
+      }
+
+      // set the path to the venvs executable
+      status = PyConfig_SetBytesString(&config, &config.executable,
+                                       "/home/nils/projects/comin/embedded_python_dummy/venv/bin/python3");
+      if (PyStatus_Exception(status)) {
+        throw status;
+      }
+
+      status = Py_InitializeFromConfig(&config);
+      if (PyStatus_Exception(status)) {
+        throw status;
+      }
+    }catch(...){
+      std::cerr << status.err_msg << std::endl;
+    }
+    PyConfig_Clear(&config);
+  }
+
+  PyObject* globals = PyDict_New();
+
+  FILE* file = fopen(argv[1], "r");
+  if (file == NULL)
+    throw std::runtime_error("Cannot read "s + std::string(argv[1]));
+  else {
+    PyObject* pyResult =
+      PyRun_File(file, argv[1], Py_file_input, globals, globals);
+    Py_XDECREF(pyResult);
+    fclose(file);
+    if (PyErr_Occurred()) {
+      PyErr_Print();
+      throw std::runtime_error("Error while executing "s +
+                               std::string(argv[1]));
+    }
+  }
+
+  return 0;
+}

test.py

+import sys
+
+print(f"{sys.prefix=}")
+print(f"{sys.base_prefix=}")
+print(f"{sys.exec_prefix=}")
+print(f"{sys.executable=}")
+print(f"{sys.path=}")