cpython/Python/pathconfig.c at e69d068ad0bd6a25434ea476a647b635da4d82bb · python/cpython · GitHub

History

496 lines (409 loc) · 12.3 KB

Raw

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

299

300

301

302

303

304

305

306

307

308

309

310

311

312

313

314

315

316

317

318

319

320

321

322

323

324

325

326

327

328

329

330

331

332

333

334

335

336

337

338

339

340

341

342

343

344

345

346

347

348

349

350

351

352

353

354

355

356

357

358

359

360

361

362

363

364

365

366

367

368

369

370

371

372

373

374

375

376

377

378

379

380

381

382

383

384

385

386

387

388

389

390

391

392

393

394

395

396

397

398

399

400

401

402

403

404

405

406

407

408

409

410

411

412

413

414

415

416

417

418

419

420

421

422

423

424

425

426

427

428

429

430

431

432

433

434

435

436

437

438

439

440

441

442

443

444

445

446

447

448

449

450

451

452

453

454

455

456

457

458

459

460

461

462

463

464

465

466

467

468

469

470

471

472

473

474

475

476

477

478

479

480

481

482

483

484

485

486

487

488

489

490

491

492

493

494

495

496

/* Path configuration like module_search_path (sys.path) */

#include "Python.h"

#include "pycore_initconfig.h" // _PyStatus_OK()

#include "pycore_fileutils.h" // _Py_wgetcwd()

#include "pycore_pathconfig.h"

#include "pycore_pymem.h" // _PyMem_SetDefaultAllocator()

#include <wchar.h>

#include "marshal.h" // PyMarshal_ReadObjectFromString

#include "osdefs.h" // DELIM

#ifdef MS_WINDOWS

# include <windows.h> // GetFullPathNameW(), MAX_PATH

# include <pathcch.h>

# include <shlwapi.h>

#endif

/* External interface */

/* Stored values set by C API functions */

typedef struct _PyPathConfig {

/* Full path to the Python program */

wchar_t *program_full_path;

wchar_t *prefix;

wchar_t *exec_prefix;

wchar_t *stdlib_dir;

/* Set by Py_SetPath */

wchar_t *module_search_path;

/* Set by _PyPathConfig_UpdateGlobal */

wchar_t *calculated_module_search_path;

/* Python program name */

wchar_t *program_name;

/* Set by Py_SetPythonHome() or PYTHONHOME environment variable */

wchar_t *home;

int _is_python_build;

} _PyPathConfig;

# define _PyPathConfig_INIT \

{.module_search_path = NULL, ._is_python_build = 0}

_PyPathConfig _Py_path_config = _PyPathConfig_INIT;

const wchar_t *

_PyPathConfig_GetGlobalModuleSearchPath(void)

{

return _Py_path_config.module_search_path;

}

void

_PyPathConfig_ClearGlobal(void)

{

PyMemAllocatorEx old_alloc;

_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);

#define CLEAR(ATTR) \

do { \

PyMem_RawFree(_Py_path_config.ATTR); \

_Py_path_config.ATTR = NULL; \

} while (0)

CLEAR(program_full_path);

CLEAR(prefix);

CLEAR(exec_prefix);

CLEAR(stdlib_dir);

CLEAR(module_search_path);

CLEAR(calculated_module_search_path);

CLEAR(program_name);

CLEAR(home);

_Py_path_config._is_python_build = 0;

#undef CLEAR

PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);

}

PyStatus

_PyPathConfig_ReadGlobal(PyConfig *config)

{

PyStatus status = _PyStatus_OK();

#define COPY(ATTR) \

do { \

if (_Py_path_config.ATTR && !config->ATTR) { \

status = PyConfig_SetString(config, &config->ATTR, _Py_path_config.ATTR); \

if (_PyStatus_EXCEPTION(status)) goto done; \

} \

} while (0)

#define COPY2(ATTR, SRCATTR) \

do { \

if (_Py_path_config.SRCATTR && !config->ATTR) { \

status = PyConfig_SetString(config, &config->ATTR, _Py_path_config.SRCATTR); \

if (_PyStatus_EXCEPTION(status)) goto done; \

} \

} while (0)

#define COPY_INT(ATTR) \

do { \

assert(_Py_path_config.ATTR >= 0); \

if ((_Py_path_config.ATTR >= 0) && (config->ATTR <= 0)) { \

config->ATTR = _Py_path_config.ATTR; \

} \

} while (0)

COPY(prefix);

COPY(exec_prefix);

COPY(stdlib_dir);

COPY(program_name);

COPY(home);

COPY2(executable, program_full_path);

COPY_INT(_is_python_build);

// module_search_path must be initialised - not read

#undef COPY

#undef COPY2

#undef COPY_INT

done:

return status;

}

PyStatus

_PyPathConfig_UpdateGlobal(const PyConfig *config)

{

PyMemAllocatorEx old_alloc;

_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);

#define COPY(ATTR) \

do { \

if (config->ATTR) { \

PyMem_RawFree(_Py_path_config.ATTR); \

_Py_path_config.ATTR = _PyMem_RawWcsdup(config->ATTR); \

if (!_Py_path_config.ATTR) goto error; \

} \

} while (0)

#define COPY2(ATTR, SRCATTR) \

do { \

if (config->SRCATTR) { \

PyMem_RawFree(_Py_path_config.ATTR); \

_Py_path_config.ATTR = _PyMem_RawWcsdup(config->SRCATTR); \

if (!_Py_path_config.ATTR) goto error; \

} \

} while (0)

#define COPY_INT(ATTR) \

do { \

if (config->ATTR > 0) { \

_Py_path_config.ATTR = config->ATTR; \

} \

} while (0)

COPY(prefix);

COPY(exec_prefix);

COPY(stdlib_dir);

COPY(program_name);

COPY(home);

COPY2(program_full_path, executable);

COPY_INT(_is_python_build);

#undef COPY

#undef COPY2

#undef COPY_INT

PyMem_RawFree(_Py_path_config.module_search_path);

_Py_path_config.module_search_path = NULL;

PyMem_RawFree(_Py_path_config.calculated_module_search_path);

_Py_path_config.calculated_module_search_path = NULL;

do {

size_t cch = 1;

for (Py_ssize_t i = 0; i < config->module_search_paths.length; ++i) {

cch += 1 + wcslen(config->module_search_paths.items[i]);

}

wchar_t *path = (wchar_t*)PyMem_RawMalloc(sizeof(wchar_t) * cch);

if (!path) {

goto error;

}

wchar_t *p = path;

for (Py_ssize_t i = 0; i < config->module_search_paths.length; ++i) {

wcscpy(p, config->module_search_paths.items[i]);

p = wcschr(p, L'\0');

*p++ = DELIM;

*p = L'\0';

}

do {

*p = L'\0';

} while (p != path && *--p == DELIM);

_Py_path_config.calculated_module_search_path = path;

} while (0);

PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);

return _PyStatus_OK();

error:

PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);

return _PyStatus_NO_MEMORY();

}

static void _Py_NO_RETURN

path_out_of_memory(const char *func)

{

_Py_FatalErrorFunc(func, "out of memory");

}

// Removed in Python 3.13 API, but kept for the stable ABI

PyAPI_FUNC(void)

Py_SetPath(const wchar_t *path)

{

if (path == NULL) {

_PyPathConfig_ClearGlobal();

return;

}

PyMemAllocatorEx old_alloc;

_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);

PyMem_RawFree(_Py_path_config.prefix);

PyMem_RawFree(_Py_path_config.exec_prefix);

PyMem_RawFree(_Py_path_config.stdlib_dir);

PyMem_RawFree(_Py_path_config.module_search_path);

PyMem_RawFree(_Py_path_config.calculated_module_search_path);

_Py_path_config.prefix = _PyMem_RawWcsdup(L"");

_Py_path_config.exec_prefix = _PyMem_RawWcsdup(L"");

// XXX Copy this from the new module_search_path?

if (_Py_path_config.home != NULL) {

_Py_path_config.stdlib_dir = _PyMem_RawWcsdup(_Py_path_config.home);

}

else {

_Py_path_config.stdlib_dir = _PyMem_RawWcsdup(L"");

}

_Py_path_config.module_search_path = _PyMem_RawWcsdup(path);

_Py_path_config.calculated_module_search_path = NULL;

PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);

if (_Py_path_config.prefix == NULL

|| _Py_path_config.exec_prefix == NULL

|| _Py_path_config.stdlib_dir == NULL

|| _Py_path_config.module_search_path == NULL)

{

path_out_of_memory(__func__);

}

void

Py_SetPythonHome(const wchar_t *home)

{

int has_value = home && home[0];

PyMemAllocatorEx old_alloc;

_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);

PyMem_RawFree(_Py_path_config.home);

_Py_path_config.home = NULL;

if (has_value) {

_Py_path_config.home = _PyMem_RawWcsdup(home);

}

PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);

if (has_value && _Py_path_config.home == NULL) {

path_out_of_memory(__func__);

}

void

Py_SetProgramName(const wchar_t *program_name)

{

int has_value = program_name && program_name[0];

PyMemAllocatorEx old_alloc;

_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);

PyMem_RawFree(_Py_path_config.program_name);

_Py_path_config.program_name = NULL;

if (has_value) {

_Py_path_config.program_name = _PyMem_RawWcsdup(program_name);

}

PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);

if (has_value && _Py_path_config.program_name == NULL) {

path_out_of_memory(__func__);

}

wchar_t *

Py_GetPath(void)

{

/* If the user has provided a path, return that */

if (_Py_path_config.module_search_path) {

return _Py_path_config.module_search_path;

}

/* If we have already done calculations, return the calculated path */

return _Py_path_config.calculated_module_search_path;

}

wchar_t *

_Py_GetStdlibDir(void)

{

wchar_t *stdlib_dir = _Py_path_config.stdlib_dir;

if (stdlib_dir != NULL && stdlib_dir[0] != L'\0') {

return stdlib_dir;

}

return NULL;

}

wchar_t *

Py_GetPrefix(void)

{

return _Py_path_config.prefix;

}

wchar_t *

Py_GetExecPrefix(void)

{

return _Py_path_config.exec_prefix;

}

wchar_t *

Py_GetProgramFullPath(void)

{

return _Py_path_config.program_full_path;

}

wchar_t*

Py_GetPythonHome(void)

{

return _Py_path_config.home;

}

wchar_t *

Py_GetProgramName(void)

{

return _Py_path_config.program_name;

}

/* Compute module search path from argv[0] or the current working

directory ("-m module" case) which will be prepended to sys.argv:

sys.path[0].

Return 1 if the path is correctly resolved and written into *path0_p.

Return 0 if it fails to resolve the full path. For example, return 0 if the

current working directory has been removed (bpo-36236) or if argv is empty.

Raise an exception and return -1 on error.

int

_PyPathConfig_ComputeSysPath0(const PyWideStringList *argv, PyObject **path0_p)

{

assert(_PyWideStringList_CheckConsistency(argv));

if (argv->length == 0) {

/* Leave sys.path unchanged if sys.argv is empty */

return 0;

}

wchar_t *argv0 = argv->items[0];

int have_module_arg = (wcscmp(argv0, L"-m") == 0);

int have_script_arg = (!have_module_arg && (wcscmp(argv0, L"-c") != 0));

wchar_t *path0 = argv0;

Py_ssize_t n = 0;

#ifdef HAVE_REALPATH

wchar_t fullpath[MAXPATHLEN];

#elif defined(MS_WINDOWS)

wchar_t fullpath[MAX_PATH];

#endif

if (have_module_arg) {

#if defined(HAVE_REALPATH) || defined(MS_WINDOWS)

if (!_Py_wgetcwd(fullpath, Py_ARRAY_LENGTH(fullpath))) {

return 0;

}

path0 = fullpath;

#else

path0 = L".";

#endif

n = wcslen(path0);

}

#ifdef HAVE_READLINK

wchar_t link[MAXPATHLEN + 1];

int nr = 0;

wchar_t path0copy[2 * MAXPATHLEN + 1];

if (have_script_arg) {

nr = _Py_wreadlink(path0, link, Py_ARRAY_LENGTH(link));

}

if (nr > 0) {

/* It's a symlink */

link[nr] = '\0';

if (link[0] == SEP) {

path0 = link; /* Link to absolute path */

}

else if (wcschr(link, SEP) == NULL) {

/* Link without path */

}

else {

/* Must join(dirname(path0), link) */

wchar_t *q = wcsrchr(path0, SEP);

if (q == NULL) {

/* path0 without path */

path0 = link;

}

else {

/* Must make a copy, path0copy has room for 2 * MAXPATHLEN */

wcsncpy(path0copy, path0, MAXPATHLEN);

q = wcsrchr(path0copy, SEP);

wcsncpy(q+1, link, MAXPATHLEN);

q[MAXPATHLEN + 1] = L'\0';

path0 = path0copy;

}

#endif /* HAVE_READLINK */

wchar_t *p = NULL;

#if SEP == '\\'

/* Special case for Microsoft filename syntax */

if (have_script_arg) {

wchar_t *q;

#if defined(MS_WINDOWS)

/* Replace the first element in argv with the full path. */

wchar_t *ptemp;

if (GetFullPathNameW(path0,

Py_ARRAY_LENGTH(fullpath),

fullpath,

&ptemp)) {

path0 = fullpath;

}

#endif

p = wcsrchr(path0, SEP);

/* Test for alternate separator */

q = wcsrchr(p ? p : path0, '/');

if (q != NULL)

p = q;

if (p != NULL) {

n = p + 1 - path0;

if (n > 1 && p[-1] != ':')

n--; /* Drop trailing separator */

}

#else

/* All other filename syntaxes */

if (have_script_arg) {

#if defined(HAVE_REALPATH)

if (_Py_wrealpath(path0, fullpath, Py_ARRAY_LENGTH(fullpath))) {

path0 = fullpath;

}

#endif

p = wcsrchr(path0, SEP);

}

if (p != NULL) {

n = p + 1 - path0;

#if SEP == '/' /* Special case for Unix filename syntax */

if (n > 1) {

/* Drop trailing separator */

n--;

}

#endif /* Unix */

}

#endif /* All others */

PyObject *path0_obj = PyUnicode_FromWideChar(path0, n);

if (path0_obj == NULL) {

return -1;

}

*path0_p = path0_obj;

return 1;

}

cpython/Python/pathconfig.c at e69d068ad0bd6a25434ea476a647b635da4d82bb · python/cpython · GitHub

Uh oh!

Expand file tree

Breadcrumbs

pathconfig.c

Latest commit

History

Breadcrumbs

pathconfig.c

File metadata and controls