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804 lines
19 KiB
804 lines
19 KiB
/* Path configuration like module_search_path (sys.path) */
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#include "Python.h"
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#include "osdefs.h" // DELIM
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#include "pycore_initconfig.h"
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#include "pycore_fileutils.h"
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#include "pycore_pathconfig.h"
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#include "pycore_pymem.h" // _PyMem_SetDefaultAllocator()
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#include <wchar.h>
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#ifdef MS_WINDOWS
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# include <windows.h> // GetFullPathNameW(), MAX_PATH
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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_PyPathConfig _Py_path_config = _PyPathConfig_INIT;
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static int
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copy_wstr(wchar_t **dst, const wchar_t *src)
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{
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assert(*dst == NULL);
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if (src != NULL) {
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*dst = _PyMem_RawWcsdup(src);
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if (*dst == NULL) {
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return -1;
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}
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}
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else {
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*dst = NULL;
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}
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return 0;
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}
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static void
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pathconfig_clear(_PyPathConfig *config)
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{
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/* _PyMem_SetDefaultAllocator() is needed to get a known memory allocator,
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since Py_SetPath(), Py_SetPythonHome() and Py_SetProgramName() can be
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called before Py_Initialize() which can changes the memory allocator. */
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PyMemAllocatorEx old_alloc;
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_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
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#define CLEAR(ATTR) \
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do { \
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PyMem_RawFree(ATTR); \
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ATTR = NULL; \
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} while (0)
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CLEAR(config->program_full_path);
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CLEAR(config->prefix);
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CLEAR(config->exec_prefix);
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CLEAR(config->module_search_path);
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CLEAR(config->program_name);
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CLEAR(config->home);
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#ifdef MS_WINDOWS
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CLEAR(config->base_executable);
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#endif
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#undef CLEAR
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PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
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}
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static PyStatus
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pathconfig_copy(_PyPathConfig *config, const _PyPathConfig *config2)
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{
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pathconfig_clear(config);
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#define COPY_ATTR(ATTR) \
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do { \
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if (copy_wstr(&config->ATTR, config2->ATTR) < 0) { \
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return _PyStatus_NO_MEMORY(); \
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} \
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} while (0)
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COPY_ATTR(program_full_path);
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COPY_ATTR(prefix);
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COPY_ATTR(exec_prefix);
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COPY_ATTR(module_search_path);
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COPY_ATTR(program_name);
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COPY_ATTR(home);
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#ifdef MS_WINDOWS
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config->isolated = config2->isolated;
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config->site_import = config2->site_import;
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COPY_ATTR(base_executable);
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#endif
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#undef COPY_ATTR
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return _PyStatus_OK();
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}
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void
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_PyPathConfig_ClearGlobal(void)
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{
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PyMemAllocatorEx old_alloc;
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_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
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pathconfig_clear(&_Py_path_config);
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PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
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}
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static wchar_t*
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_PyWideStringList_Join(const PyWideStringList *list, wchar_t sep)
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{
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size_t len = 1; /* NUL terminator */
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for (Py_ssize_t i=0; i < list->length; i++) {
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if (i != 0) {
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len++;
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}
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len += wcslen(list->items[i]);
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}
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wchar_t *text = PyMem_RawMalloc(len * sizeof(wchar_t));
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if (text == NULL) {
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return NULL;
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}
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wchar_t *str = text;
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for (Py_ssize_t i=0; i < list->length; i++) {
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wchar_t *path = list->items[i];
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if (i != 0) {
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*str++ = sep;
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}
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len = wcslen(path);
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memcpy(str, path, len * sizeof(wchar_t));
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str += len;
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}
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*str = L'\0';
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return text;
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}
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static PyStatus
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pathconfig_set_from_config(_PyPathConfig *pathconfig, const PyConfig *config)
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{
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PyStatus status;
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PyMemAllocatorEx old_alloc;
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_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
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if (config->module_search_paths_set) {
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PyMem_RawFree(pathconfig->module_search_path);
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pathconfig->module_search_path = _PyWideStringList_Join(&config->module_search_paths, DELIM);
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if (pathconfig->module_search_path == NULL) {
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goto no_memory;
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}
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}
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#define COPY_CONFIG(PATH_ATTR, CONFIG_ATTR) \
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if (config->CONFIG_ATTR) { \
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PyMem_RawFree(pathconfig->PATH_ATTR); \
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pathconfig->PATH_ATTR = NULL; \
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if (copy_wstr(&pathconfig->PATH_ATTR, config->CONFIG_ATTR) < 0) { \
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goto no_memory; \
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} \
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}
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COPY_CONFIG(program_full_path, executable);
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COPY_CONFIG(prefix, prefix);
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COPY_CONFIG(exec_prefix, exec_prefix);
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COPY_CONFIG(program_name, program_name);
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COPY_CONFIG(home, home);
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#ifdef MS_WINDOWS
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COPY_CONFIG(base_executable, base_executable);
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#endif
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#undef COPY_CONFIG
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status = _PyStatus_OK();
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goto done;
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no_memory:
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status = _PyStatus_NO_MEMORY();
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done:
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PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
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return status;
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}
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PyStatus
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_PyConfig_WritePathConfig(const PyConfig *config)
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{
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return pathconfig_set_from_config(&_Py_path_config, config);
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}
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static PyStatus
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config_init_module_search_paths(PyConfig *config, _PyPathConfig *pathconfig)
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{
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assert(!config->module_search_paths_set);
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_PyWideStringList_Clear(&config->module_search_paths);
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const wchar_t *sys_path = pathconfig->module_search_path;
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const wchar_t delim = DELIM;
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while (1) {
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const wchar_t *p = wcschr(sys_path, delim);
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if (p == NULL) {
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p = sys_path + wcslen(sys_path); /* End of string */
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}
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size_t path_len = (p - sys_path);
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wchar_t *path = PyMem_RawMalloc((path_len + 1) * sizeof(wchar_t));
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if (path == NULL) {
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return _PyStatus_NO_MEMORY();
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}
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memcpy(path, sys_path, path_len * sizeof(wchar_t));
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path[path_len] = L'\0';
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PyStatus status = PyWideStringList_Append(&config->module_search_paths, path);
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PyMem_RawFree(path);
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if (_PyStatus_EXCEPTION(status)) {
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return status;
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}
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if (*p == '\0') {
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break;
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}
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sys_path = p + 1;
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}
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config->module_search_paths_set = 1;
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return _PyStatus_OK();
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}
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/* Calculate the path configuration:
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- exec_prefix
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- module_search_path
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- prefix
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- program_full_path
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On Windows, more fields are calculated:
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- base_executable
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- isolated
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- site_import
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On other platforms, isolated and site_import are left unchanged, and
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_PyConfig_InitPathConfig() copies executable to base_executable (if it's not
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set).
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Priority, highest to lowest:
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- PyConfig
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- _Py_path_config: set by Py_SetPath(), Py_SetPythonHome()
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and Py_SetProgramName()
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- _PyPathConfig_Calculate()
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*/
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static PyStatus
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pathconfig_calculate(_PyPathConfig *pathconfig, const PyConfig *config)
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{
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PyStatus status;
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PyMemAllocatorEx old_alloc;
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_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
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status = pathconfig_copy(pathconfig, &_Py_path_config);
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if (_PyStatus_EXCEPTION(status)) {
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goto done;
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}
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status = pathconfig_set_from_config(pathconfig, config);
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if (_PyStatus_EXCEPTION(status)) {
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goto done;
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}
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if (_Py_path_config.module_search_path == NULL) {
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status = _PyPathConfig_Calculate(pathconfig, config);
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}
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else {
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/* Py_SetPath() has been called: avoid _PyPathConfig_Calculate() */
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}
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done:
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PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
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return status;
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}
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static PyStatus
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config_calculate_pathconfig(PyConfig *config)
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{
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_PyPathConfig pathconfig = _PyPathConfig_INIT;
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PyStatus status;
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status = pathconfig_calculate(&pathconfig, config);
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if (_PyStatus_EXCEPTION(status)) {
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goto done;
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}
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if (!config->module_search_paths_set) {
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status = config_init_module_search_paths(config, &pathconfig);
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if (_PyStatus_EXCEPTION(status)) {
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goto done;
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}
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}
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#define COPY_ATTR(PATH_ATTR, CONFIG_ATTR) \
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if (config->CONFIG_ATTR == NULL) { \
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if (copy_wstr(&config->CONFIG_ATTR, pathconfig.PATH_ATTR) < 0) { \
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goto no_memory; \
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} \
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}
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#ifdef MS_WINDOWS
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if (config->executable != NULL && config->base_executable == NULL) {
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/* If executable is set explicitly in the configuration,
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ignore calculated base_executable: _PyConfig_InitPathConfig()
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will copy executable to base_executable */
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}
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else {
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COPY_ATTR(base_executable, base_executable);
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}
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#endif
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COPY_ATTR(program_full_path, executable);
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COPY_ATTR(prefix, prefix);
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COPY_ATTR(exec_prefix, exec_prefix);
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#undef COPY_ATTR
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#ifdef MS_WINDOWS
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/* If a ._pth file is found: isolated and site_import are overriden */
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if (pathconfig.isolated != -1) {
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config->isolated = pathconfig.isolated;
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}
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if (pathconfig.site_import != -1) {
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config->site_import = pathconfig.site_import;
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}
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#endif
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status = _PyStatus_OK();
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goto done;
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no_memory:
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status = _PyStatus_NO_MEMORY();
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done:
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pathconfig_clear(&pathconfig);
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return status;
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}
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PyStatus
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_PyConfig_InitPathConfig(PyConfig *config)
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{
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/* Do we need to calculate the path? */
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if (!config->module_search_paths_set
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|| config->executable == NULL
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|| config->prefix == NULL
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|| config->exec_prefix == NULL)
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{
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PyStatus status = config_calculate_pathconfig(config);
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if (_PyStatus_EXCEPTION(status)) {
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return status;
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}
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}
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if (config->base_prefix == NULL) {
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if (copy_wstr(&config->base_prefix, config->prefix) < 0) {
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return _PyStatus_NO_MEMORY();
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}
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}
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if (config->base_exec_prefix == NULL) {
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if (copy_wstr(&config->base_exec_prefix,
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config->exec_prefix) < 0) {
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return _PyStatus_NO_MEMORY();
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}
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}
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if (config->base_executable == NULL) {
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if (copy_wstr(&config->base_executable,
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config->executable) < 0) {
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return _PyStatus_NO_MEMORY();
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}
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}
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return _PyStatus_OK();
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}
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static PyStatus
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pathconfig_global_read(_PyPathConfig *pathconfig)
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{
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PyConfig config;
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_PyConfig_InitCompatConfig(&config);
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/* Call _PyConfig_InitPathConfig() */
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PyStatus status = PyConfig_Read(&config);
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if (_PyStatus_EXCEPTION(status)) {
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goto done;
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}
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status = pathconfig_set_from_config(pathconfig, &config);
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done:
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PyConfig_Clear(&config);
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return status;
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}
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static void
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pathconfig_global_init(void)
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{
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PyStatus status;
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if (_Py_path_config.module_search_path == NULL) {
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status = pathconfig_global_read(&_Py_path_config);
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if (_PyStatus_EXCEPTION(status)) {
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Py_ExitStatusException(status);
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}
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}
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else {
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/* Global configuration already initialized */
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}
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assert(_Py_path_config.program_full_path != NULL);
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assert(_Py_path_config.prefix != NULL);
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assert(_Py_path_config.exec_prefix != NULL);
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assert(_Py_path_config.module_search_path != NULL);
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assert(_Py_path_config.program_name != NULL);
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/* home can be NULL */
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#ifdef MS_WINDOWS
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assert(_Py_path_config.base_executable != NULL);
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#endif
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}
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/* External interface */
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static void _Py_NO_RETURN
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path_out_of_memory(const char *func)
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{
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_Py_FatalErrorFunc(func, "out of memory");
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}
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void
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Py_SetPath(const wchar_t *path)
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{
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if (path == NULL) {
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pathconfig_clear(&_Py_path_config);
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return;
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}
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PyMemAllocatorEx old_alloc;
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_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
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/* Getting the program full path calls pathconfig_global_init() */
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wchar_t *program_full_path = _PyMem_RawWcsdup(Py_GetProgramFullPath());
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PyMem_RawFree(_Py_path_config.program_full_path);
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PyMem_RawFree(_Py_path_config.prefix);
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PyMem_RawFree(_Py_path_config.exec_prefix);
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PyMem_RawFree(_Py_path_config.module_search_path);
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_Py_path_config.program_full_path = program_full_path;
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_Py_path_config.prefix = _PyMem_RawWcsdup(L"");
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_Py_path_config.exec_prefix = _PyMem_RawWcsdup(L"");
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_Py_path_config.module_search_path = _PyMem_RawWcsdup(path);
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PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
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if (_Py_path_config.program_full_path == NULL
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|| _Py_path_config.prefix == NULL
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|| _Py_path_config.exec_prefix == NULL
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|| _Py_path_config.module_search_path == NULL)
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{
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path_out_of_memory(__func__);
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}
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}
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|
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void
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Py_SetPythonHome(const wchar_t *home)
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{
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if (home == NULL) {
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return;
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}
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PyMemAllocatorEx old_alloc;
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_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
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PyMem_RawFree(_Py_path_config.home);
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_Py_path_config.home = _PyMem_RawWcsdup(home);
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PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
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if (_Py_path_config.home == NULL) {
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path_out_of_memory(__func__);
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}
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}
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|
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void
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Py_SetProgramName(const wchar_t *program_name)
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{
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if (program_name == NULL || program_name[0] == L'\0') {
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return;
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}
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|
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PyMemAllocatorEx old_alloc;
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_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
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PyMem_RawFree(_Py_path_config.program_name);
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_Py_path_config.program_name = _PyMem_RawWcsdup(program_name);
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PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
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if (_Py_path_config.program_name == NULL) {
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path_out_of_memory(__func__);
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}
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}
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void
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_Py_SetProgramFullPath(const wchar_t *program_full_path)
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{
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if (program_full_path == NULL || program_full_path[0] == L'\0') {
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return;
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}
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PyMemAllocatorEx old_alloc;
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_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
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PyMem_RawFree(_Py_path_config.program_full_path);
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_Py_path_config.program_full_path = _PyMem_RawWcsdup(program_full_path);
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PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
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if (_Py_path_config.program_full_path == NULL) {
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path_out_of_memory(__func__);
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}
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}
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wchar_t *
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Py_GetPath(void)
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{
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pathconfig_global_init();
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return _Py_path_config.module_search_path;
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}
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wchar_t *
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Py_GetPrefix(void)
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{
|
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pathconfig_global_init();
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return _Py_path_config.prefix;
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}
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|
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wchar_t *
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Py_GetExecPrefix(void)
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|
{
|
|
pathconfig_global_init();
|
|
return _Py_path_config.exec_prefix;
|
|
}
|
|
|
|
|
|
wchar_t *
|
|
Py_GetProgramFullPath(void)
|
|
{
|
|
pathconfig_global_init();
|
|
return _Py_path_config.program_full_path;
|
|
}
|
|
|
|
|
|
wchar_t*
|
|
Py_GetPythonHome(void)
|
|
{
|
|
pathconfig_global_init();
|
|
return _Py_path_config.home;
|
|
}
|
|
|
|
|
|
wchar_t *
|
|
Py_GetProgramName(void)
|
|
{
|
|
pathconfig_global_init();
|
|
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;
|
|
}
|
|
|
|
|
|
#ifdef MS_WINDOWS
|
|
#define WCSTOK wcstok_s
|
|
#else
|
|
#define WCSTOK wcstok
|
|
#endif
|
|
|
|
/* Search for a prefix value in an environment file (pyvenv.cfg).
|
|
|
|
- If found, copy it into *value_p: string which must be freed by
|
|
PyMem_RawFree().
|
|
- If not found, *value_p is set to NULL.
|
|
*/
|
|
PyStatus
|
|
_Py_FindEnvConfigValue(FILE *env_file, const wchar_t *key,
|
|
wchar_t **value_p)
|
|
{
|
|
*value_p = NULL;
|
|
|
|
char buffer[MAXPATHLEN * 2 + 1]; /* allow extra for key, '=', etc. */
|
|
buffer[Py_ARRAY_LENGTH(buffer)-1] = '\0';
|
|
|
|
while (!feof(env_file)) {
|
|
char * p = fgets(buffer, Py_ARRAY_LENGTH(buffer) - 1, env_file);
|
|
|
|
if (p == NULL) {
|
|
break;
|
|
}
|
|
|
|
size_t n = strlen(p);
|
|
if (p[n - 1] != '\n') {
|
|
/* line has overflowed - bail */
|
|
break;
|
|
}
|
|
if (p[0] == '#') {
|
|
/* Comment - skip */
|
|
continue;
|
|
}
|
|
|
|
wchar_t *tmpbuffer = _Py_DecodeUTF8_surrogateescape(buffer, n, NULL);
|
|
if (tmpbuffer) {
|
|
wchar_t * state;
|
|
wchar_t * tok = WCSTOK(tmpbuffer, L" \t\r\n", &state);
|
|
if ((tok != NULL) && !wcscmp(tok, key)) {
|
|
tok = WCSTOK(NULL, L" \t", &state);
|
|
if ((tok != NULL) && !wcscmp(tok, L"=")) {
|
|
tok = WCSTOK(NULL, L"\r\n", &state);
|
|
if (tok != NULL) {
|
|
*value_p = _PyMem_RawWcsdup(tok);
|
|
PyMem_RawFree(tmpbuffer);
|
|
|
|
if (*value_p == NULL) {
|
|
return _PyStatus_NO_MEMORY();
|
|
}
|
|
|
|
/* found */
|
|
return _PyStatus_OK();
|
|
}
|
|
}
|
|
}
|
|
PyMem_RawFree(tmpbuffer);
|
|
}
|
|
}
|
|
|
|
/* not found */
|
|
return _PyStatus_OK();
|
|
}
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|