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Fix getProgramPath() to find Python module in virtual environment on Windows and Linux #368

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Fix getProgramPath() to find Python module in virtual environment on Windows and Linux #368

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55 changes: 50 additions & 5 deletions Utilities/FileSystem.h
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,7 @@
#else
#include <unistd.h>
#include <dirent.h>
#include <dlfcn.h>
#endif
#ifdef __APPLE__
#include <mach-o/dyld.h>
Expand Down Expand Up @@ -217,21 +218,65 @@ namespace Utilities

static std::string getProgramPath()
{
bool inPythonModule = false;
char buffer[1000];
#ifdef WIN32
GetModuleFileName(NULL, buffer, 1000);
std::string bufferStr(buffer);
#ifdef WIN32
GetModuleFileNameA(NULL, buffer, 1000);
bufferStr = std::string(buffer);

// If the program is running as a Python module, the path to the module, not the executable, must be obtained
inPythonModule = bufferStr.size() >= 10 && bufferStr.substr(bufferStr.size() - 10) == "python.exe";

if (inPythonModule) {
// Get the module handle for the current module
HMODULE hModule = nullptr;
GetModuleHandleExA(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS | GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
reinterpret_cast<LPCSTR>(&getProgramPath), &hModule);

// Retrieve the full path of the module
DWORD length = GetModuleFileNameA(hModule, buffer, 1000);
bufferStr = std::string(buffer);

bufferStr = bufferStr.substr(0, bufferStr.find_last_of("\\/"));
bufferStr = bufferStr.substr(0, bufferStr.find_last_of("\\/"));
bufferStr = bufferStr.substr(0, bufferStr.find_last_of("\\/"));
}
else {
bufferStr = bufferStr.substr(0, bufferStr.find_last_of("\\/"));
}
#elif defined(__APPLE__)
uint32_t bufferSize = sizeof(buffer);
_NSGetExecutablePath(buffer, &bufferSize);
bufferStr = std::string(buffer);
bufferStr = bufferStr.substr(0, bufferStr.find_last_of("\\/"));
#else
char szTmp[32];
sprintf(szTmp, "/proc/%d/exe", getpid());
int bytes = std::min((int)readlink(szTmp, buffer, 1000), 999);
buffer[bytes] = '\0';
bufferStr = std::string(buffer);

// If the program is running as a Python module, the path to the module, not the executable, must be obtained
inPythonModule = bufferStr.size() >= 6
&& bufferStr.substr(bufferStr.size() - std::min<size_t>(10, bufferStr.size())).find("python")
!= std::string::npos;

if (inPythonModule) {
Dl_info info{};
dladdr(reinterpret_cast<void*>(&getProgramPath), &info) && info.dli_fname;
bufferStr = info.dli_fname;
bufferStr = bufferStr.substr(0, bufferStr.find_last_of("\\/"));
bufferStr = bufferStr.substr(0, bufferStr.find_last_of("\\/"));
bufferStr = bufferStr.substr(0, bufferStr.find_last_of("\\/"));
bufferStr = bufferStr.substr(0, bufferStr.find_last_of("\\/"));
bufferStr += "/bin";
}
else {
bufferStr = bufferStr.substr(0, bufferStr.find_last_of("\\/"));
}
#endif
std::string::size_type pos = std::string(buffer).find_last_of("\\/");
return std::string(buffer).substr(0, pos);

return bufferStr;
}

static bool copyFile(const std::string &source, const std::string &dest)
Expand Down