pymanager/src/pymanager/main.cpp at main · python/pymanager · GitHub

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#include <Python.h>

#include <string.h>

#include <Windows.h>

#include <shlwapi.h>

#include <stdio.h>

#include <shellapi.h>

#include <shlobj.h>

#include <string>

#include <vector>

#include "_launch.h"

#include "src\_native\helpers.h"

#include "commands.g.h"

// HRESULT-compatible error codes

#define ERROR_NO_MATCHING_INSTALL 0xA0000004

#define ERROR_NO_INSTALLS 0xA0000005

#define ERROR_AUTO_INSTALL_DISABLED 0xA0000006

#ifndef PY_WINDOWED

#define PY_WINDOWED 0

#endif

// Uncomment to add the --__fix-cwd private argument, which will reset the

// working directory to the script location or user documents/profile before

// running Python.

//#define ENABLE_FIX_CWD

struct {

PyObject *mod;

PyObject *no_install_found_error;

PyObject *no_installs_error;

PyObject *auto_install_disabled_error;

} manage = {NULL};

static std::wstring

get_exe_path()

{

std::wstring path;

while (true) {

path.resize(path.size() + 260);

DWORD path_len = GetModuleFileNameW(NULL, path.data(), path.size());

if (!path_len) {

break;

}

if (path_len <= path.size()) {

path.resize(path_len);

return path;

}

return std::wstring();

}

static std::wstring

get_exe_directory()

{

std::wstring path = get_exe_path();

if (path.size()) {

path.resize(path.find_last_of(L"/\\", path.size(), 2));

}

return path;

}

static std::wstring

get_root()

{

return get_exe_directory();

}

static bool

is_env_var_set(const wchar_t *name)

{

/* only looking for non-empty, which means at least one character

and the null terminator */

return GetEnvironmentVariableW(name, NULL, 0) >= 2;

}

static int

configure_long_path()

{

HKEY key;

LRESULT r;

r = RegCreateKeyExW(HKEY_LOCAL_MACHINE, L"System\\CurrentControlSet\\Control\\FileSystem",

0, NULL, 0, KEY_WRITE, NULL, &key, NULL);

if (r) {

return r;

}

DWORD value = 1;

r = RegSetValueExW(key, L"LongPathsEnabled", 0, REG_DWORD, (BYTE *)&value, sizeof(value));

RegCloseKey(key);

return r;

}

static void

per_exe_settings(

int argc,

wchar_t **argv,

const wchar_t **default_command,

bool *commands,

bool *cli_tag,

bool *shebangs,

bool *autoinstall

) {

#ifdef EXE_NAME

const wchar_t *name = EXE_NAME;

int cch = -1;

#else

const wchar_t *argv0 = argv[0];

size_t n = wcslen(argv0);

size_t dot = 0;

while (n > 0 && argv0[n - 1] != L'\\' && argv0[n - 1] != L'/') {

--n;

if (!dot && argv0[n] == L'.') {

dot = n;

}

int cch = dot > n ? (int)(dot - n) : -1;

if (cch > 1 && (argv0[n + cch - 1] == L'w' || argv0[n + cch - 1] == L'W')) {

--cch;

}

const wchar_t *name = &argv0[n];

#endif

if (CompareStringOrdinal(name, cch, L"python", -1, TRUE) == CSTR_EQUAL

|| CompareStringOrdinal(name, cch, L"pythonw", -1, TRUE) == CSTR_EQUAL) {

*default_command = NULL;

*commands = false;

*cli_tag = false;

*shebangs = argc >= 2;

*autoinstall = false;

return;

}

if (CompareStringOrdinal(name, cch, L"python3", -1, TRUE) == CSTR_EQUAL

|| CompareStringOrdinal(name, cch, L"pythonw3", -1, TRUE) == CSTR_EQUAL) {

*default_command = NULL;

*commands = false;

*cli_tag = false;

*shebangs = argc >= 2;

*autoinstall = false;

return;

}

if (CompareStringOrdinal(name, cch, L"py", -1, TRUE) == CSTR_EQUAL

|| CompareStringOrdinal(name, cch, L"pyw", -1, TRUE) == CSTR_EQUAL) {

*default_command = NULL;

*commands = argc >= 2;

*cli_tag = argc >= 2;

*shebangs = argc >= 2;

*autoinstall = argc >= 2 && !wcscmp(argv[1], L"exec");

return;

}

if (CompareStringOrdinal(name, cch, L"pymanager", -1, TRUE) == CSTR_EQUAL

|| CompareStringOrdinal(name, cch, L"pywmanager", -1, TRUE) == CSTR_EQUAL) {

*default_command = argc >= 2 ? L"**help_with_error" : L"help";

*commands = argc >= 2;

*cli_tag = false;

*shebangs = false;

*autoinstall = argc >= 2 && !wcscmp(argv[1], L"exec");

return;

}

// This case is for direct launches (including first run), or Start menu

// launch.

*default_command = L"**first_run";

*commands = argc >= 2;

*cli_tag = true;

*shebangs = true;

*autoinstall = true;

}

static int

read_tag_from_argv(int argc, const wchar_t **argv, int skip_argc, std::wstring &tag)

{

if (1 + skip_argc >= argc) {

return 0;

}

std::wstring arg = argv[1 + skip_argc];

if (arg[0] != L'-' && arg[0] != L'/') {

return 0;

}

if (arg.substr(1, 2) == L"V:") {

tag = arg.substr(3);

return 1;

} else if (arg[1] == L'3') {

tag = std::wstring(L"PythonCore\\") + arg.substr(1);

return 1;

}

return 0;

}

static int

args_to_skip(const wchar_t *arg)

{

int retval = 0;

for (const wchar_t *c = arg; *c; ++c) {

switch (*c) {

case L'c':

case L'm':

return -1;

case L'W':

case L'X':

retval = 1;

case L'-':

break;

default:

if (!isalnum(*c)) {

return 0;

}

return retval;

}

static void

read_script_from_argv(int argc, const wchar_t **argv, int skip_argc, std::wstring &script)

{

int skip = skip_argc;

for (int i = 1; i < argc; ++i) {

if (skip > 0) {

--skip;

continue;

}

if (argv[i][0] == L'-') {

skip = args_to_skip(argv[i]);

if (skip < 0) {

break;

}

continue;

}

script = argv[i];

return;

}

static int

init_python()

{

// Ensure we are safely loading before triggering delay loaded DLL

if (!SetDefaultDllDirectories(LOAD_LIBRARY_SEARCH_SYSTEM32

| LOAD_LIBRARY_SEARCH_USER_DIRS

| LOAD_LIBRARY_SEARCH_APPLICATION_DIR)) {

return HRESULT_FROM_WIN32(GetLastError());

}

std::wstring exe_dir = get_exe_directory();

if (exe_dir.empty()) {

return HRESULT_FROM_WIN32(GetLastError());

}

exe_dir += L"\\runtime";

AddDllDirectory(exe_dir.c_str());

PyStatus status;

PyConfig config;

PyConfig_InitIsolatedConfig(&config);

config.import_time = is_env_var_set(L"PYMANAGER_IMPORT_TIME");

status = Py_InitializeFromConfig(&config);

if (PyStatus_Exception(status)) {

PyConfig_Clear(&config);

if (PyStatus_IsExit(status)) {

return status.exitcode;

}

assert(PyStatus_Exception(status));

Py_ExitStatusException(status);

// Unreachable

return -1;

}

// Ensure our main module is loadable

manage.mod = PyImport_ImportModule("manage");

if (!manage.mod) {

PyErr_Print();

return -1;

}

manage.no_install_found_error = PyObject_GetAttrString(manage.mod, "NoInstallFoundError");

if (!manage.no_install_found_error) {

PyErr_Print();

return -1;

}

manage.no_installs_error = PyObject_GetAttrString(manage.mod, "NoInstallsError");

if (!manage.no_installs_error) {

PyErr_Print();

return -1;

}

manage.auto_install_disabled_error = PyObject_GetAttrString(manage.mod, "AutomaticInstallDisabledError");

if (!manage.auto_install_disabled_error) {

PyErr_Print();

return -1;

}

PyObject *r = PyObject_CallMethod(manage.mod, "_set_exe_name", "u", EXE_NAME);

if (!r) {

PyErr_Print();

return -1;

}

Py_DECREF(r);

return 0;

}

static void

close_python()

{

assert(manage.mod);

Py_CLEAR(manage.no_installs_error);

Py_CLEAR(manage.no_install_found_error);

Py_CLEAR(manage.auto_install_disabled_error);

Py_CLEAR(manage.mod);

Py_Finalize();

}

static int

run_command(int argc, const wchar_t **argv)

{

int exitCode = 1;

auto root_str = get_root();

PyObject *args = NULL;

PyObject *root = NULL;

PyObject *r = NULL;

HANDLE hGlobalSem = CreateSemaphoreExW(NULL, 0, 1,

L"PyManager-OperationInProgress", 0, SEMAPHORE_MODIFY_STATE | SYNCHRONIZE);

if (!hGlobalSem) {

return GetLastError();

} else if (GetLastError() == ERROR_ALREADY_EXISTS) {

DWORD waitTime = 3000;

DWORD res = WAIT_IO_COMPLETION;

while (res == WAIT_IO_COMPLETION) {

res = WaitForSingleObjectEx(hGlobalSem, waitTime, TRUE);

switch (res) {

case WAIT_OBJECT_0:

case WAIT_ABANDONED:

break;

case WAIT_TIMEOUT:

if (waitTime != INFINITE) {

fprintf(stderr, "Waiting for other operations to complete. . .\n");

waitTime = INFINITE;

res = WAIT_IO_COMPLETION;

} else {

exitCode = WAIT_TIMEOUT;

}

break;

case WAIT_FAILED:

exitCode = GetLastError();

break;

default:

res = WAIT_IO_COMPLETION;

break;

}

args = PyList_New(0);

if (!args) goto python_fail;

for (int i = 0; i < argc; ++i) {

PyObject *s = PyUnicode_FromWideChar(argv[i], -1);

if (!s) goto python_fail;

if (PyList_Append(args, s) < 0) {

Py_DECREF(s);

goto python_fail;

}

Py_DECREF(s);

}

root = PyUnicode_FromWideChar(root_str.c_str(), -1);

if (!root) goto python_fail;

r = PyObject_CallMethod(manage.mod, "main", "OO", args, root);

if (r) {

exitCode = PyLong_AsLong(r);

goto done;

}

python_fail:

PyErr_Print();

done:

ReleaseSemaphore(hGlobalSem, 1, NULL);

CloseHandle(hGlobalSem);

Py_XDECREF(r);

Py_XDECREF(root);

Py_XDECREF(args);

return exitCode;

}

static int

run_simple_command(const wchar_t *argv0, const wchar_t *cmd)

{

int exitCode = 1;

auto root_str = get_root();

PyObject *args = NULL;

PyObject *root = NULL;

PyObject *r = NULL;

args = Py_BuildValue("(uu)", argv0, cmd);

if (!args) goto python_fail;

root = PyUnicode_FromWideChar(root_str.c_str(), -1);

if (!root) goto python_fail;

r = PyObject_CallMethod(manage.mod, "main", "OO", args, root);

if (r) {

exitCode = PyLong_AsLong(r);

goto done;

}

python_fail:

PyErr_Print();

done:

Py_XDECREF(r);

Py_XDECREF(root);

Py_XDECREF(args);

return exitCode;

}

static int

auto_install_runtime(

const wchar_t *argv0,

const std::wstring &tag,

const std::wstring &script,

int err_cause

)

{

int err = 0;

const wchar_t *new_argv[] = { argv0, NULL, NULL, NULL, NULL };

new_argv[1] = L"install";

new_argv[2] = L"--automatic";

if (!tag.empty()) {

new_argv[3] = tag.c_str();

err = run_command(4, new_argv);

} else if (!script.empty()) {

new_argv[3] = L"--from-script";

new_argv[4] = script.c_str();

err = run_command(5, new_argv);

} else {

err = run_command(3, new_argv);

}

return err;

}

static int

locate_runtime(

const std::wstring &tag,

const std::wstring &script,

std::wstring &executable,

std::wstring &args,

int autoinstall_permitted,

int print_not_found_error

) {

int exitCode = 1;

auto root_str = get_root();

PyObject *r = NULL;

r = PyObject_CallMethod(manage.mod, "find_one", "uuuiii",

root_str.c_str(), tag.c_str(), script.c_str(), PY_WINDOWED, autoinstall_permitted, print_not_found_error);

if (!r) {

if (PyErr_ExceptionMatches(manage.no_installs_error)) {

exitCode = ERROR_NO_INSTALLS;

} else if (PyErr_ExceptionMatches(manage.no_install_found_error)) {

exitCode = ERROR_NO_MATCHING_INSTALL;

} else if (PyErr_ExceptionMatches(manage.auto_install_disabled_error)) {

exitCode = ERROR_AUTO_INSTALL_DISABLED;

}

// Other errors should already have been printed

PyErr_Clear();

goto done;

} else {

wchar_t *w_exe, *w_args;

if (!PyArg_ParseTuple(r, "O&O&", as_utf16, &w_exe, as_utf16, &w_args)) {

PyErr_Print();

goto done;

}

executable = w_exe;

args = w_args;

PyMem_Free(w_exe);

PyMem_Free(w_args);

exitCode = 0;

}

done:

Py_XDECREF(r);

return exitCode;

}

#ifdef ENABLE_FIX_CWD

static int

fix_working_directory(const std::wstring &script)

{

HRESULT hr;

// If we have a script, use its parent directory

if (!script.empty()) {

auto end = script.find_last_of(L"/\\");

if (end != script.npos) {

std::wstring current_dir(script.data(), end);

SetCurrentDirectoryW(current_dir.c_str());

return 0;

}

// If we have no script, assume the user's documents folder

wchar_t *path;

if (SUCCEEDED(hr = SHGetKnownFolderPath(FOLDERID_Documents, 0, NULL, &path))) {

SetCurrentDirectoryW(path);

CoTaskMemFree(path);

return 0;

}

// As a fallback, use the user's profile (e.g. for SYSTEM)

if (SUCCEEDED(hr = SHGetKnownFolderPath(FOLDERID_Profile, 0, NULL, &path))) {

SetCurrentDirectoryW(path);

CoTaskMemFree(path);

return 0;

}

return hr;

}

#endif

int

wmain(int argc, wchar_t **argv)

{

int err = 0;

DWORD exitCode;

std::wstring executable, args, tag, script;

int skip_argc = 0;

if (argc == 2 && 0 == wcscmp(argv[1], L"**configure-long-paths")) {

return configure_long_path();

}

err = init_python();

if (err) {

return err;

}

CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);

const wchar_t *default_cmd;

bool use_commands, use_cli_tag, use_shebangs, use_autoinstall;

#ifdef ENABLE_FIX_CWD

bool fix_cwd = false;

#endif

per_exe_settings(argc, argv, &default_cmd, &use_commands, &use_cli_tag, &use_shebangs, &use_autoinstall);

if (use_commands) {

// Subcommands list is generated at sdist/build time and stored

// in commands.g.h

for (const wchar_t **cmd_name = subcommands; *cmd_name; ++cmd_name) {

if (!wcscmp(argv[1], *cmd_name)) {

err = run_command(argc, (const wchar_t **)argv);

goto error;

}

// We handle 'exec' in native code, so it won't be in the above list

if (!wcscmp(argv[1], L"exec")) {

skip_argc += 1;

#ifdef ENABLE_FIX_CWD

if (!wcscmp(argv[2], L"--__fix-cwd")) {

fix_cwd = true;

skip_argc += 1;

}

#endif

use_cli_tag = argc >= 3;

use_shebangs = argc >= 3;

default_cmd = NULL;

}

// Use the default command if we have one

if (default_cmd) {

if (!wcscmp(default_cmd, L"**help_with_error")) {

const wchar_t *new_argv[] = {argv[0], default_cmd, argv[1]};

return run_command(3, new_argv);

}

return run_simple_command(argv[0], default_cmd);

}

if (use_cli_tag && read_tag_from_argv(argc, (const wchar_t **)argv, skip_argc, tag)) {

skip_argc += 1;

use_shebangs = false;

}

if (use_shebangs) {

read_script_from_argv(argc, (const wchar_t **)argv, skip_argc, script);

}

err = locate_runtime(tag, script, executable, args, use_autoinstall ? 1 : 0, 0);

if (err == ERROR_NO_MATCHING_INSTALL || err == ERROR_NO_INSTALLS) {

err = auto_install_runtime(argv[0], tag, script, err);

if (!err) {

err = locate_runtime(tag, script, executable, args, 1, 1);

}

if (err == ERROR_NO_MATCHING_INSTALL

|| err == ERROR_NO_INSTALLS

|| err == ERROR_AUTO_INSTALL_DISABLED

) {

// Error has already been displayed

goto error;

}

if (err) {

// Most 'not found' errors have been handled above. These are internal

fprintf(stderr, "[ERROR] Internal error 0x%08X. "

"Please report to https://github.com/python/pymanager\n", err);

goto error;

}

// Theoretically shouldn't matter, but might help reduce memory usage.

close_python();

#ifdef ENABLE_FIX_CWD

if (fix_cwd) {

err = fix_working_directory(script);

if (err) {

fprintf(stderr, "[WARN] Failed to fix working directory (0x%08X).\n", err);

}

#endif

err = launch(executable.c_str(), GetCommandLineW(), args.c_str(), skip_argc, &exitCode);

// TODO: Consider sharing print_error() with launcher.cpp

// This will ensure error messages are aligned whether we're launching

// through py.exe or through an alias.

switch (err) {

case 0:

err = (int)exitCode;

break;

case ERROR_EXE_MACHINE_TYPE_MISMATCH:

case HRESULT_FROM_WIN32(ERROR_EXE_MACHINE_TYPE_MISMATCH):

fprintf(stderr,

"[ERROR] Executable '%ls' is for a different kind of "

"processor architecture.\n",

executable.c_str());

fprintf(stderr,

"Try using '-V:<version>' to select a different runtime, or use "

"'py install' to install one for your CPU.\n");

break;

default:

fprintf(stderr, "[ERROR] Failed to launch '%ls' (0x%08X)\n", executable.c_str(), err);

fprintf(stderr, "This may be a corrupt install or a system configuration issue.\n");

break;

}

return err;

error:

close_python();

return err;

}

#if PY_WINDOWED

int WINAPI

wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPWSTR lpCmdLine, int nCmdShow)

{

return wmain(__argc, __wargv);

}

#endif

pymanager/src/pymanager/main.cpp at main · python/pymanager · GitHub

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