From 221fd84703c545408bbb4a6e0b58459651331f5c Mon Sep 17 00:00:00 2001 From: Victor Stinner Date: Wed, 25 Sep 2019 02:54:25 +0200 Subject: bpo-38234: Cleanup getpath.c (GH-16367) * search_for_prefix() directly calls reduce() if found is greater than 0. * Add calculate_pybuilddir() subfunction. * search_for_prefix(): add path string buffer for readability. * Fix some error handling code paths: release resources on error. * calculate_read_pyenv(): rename tmpbuffer to filename. * test.pythoninfo now also logs windows.dll_path --- Modules/getpath.c | 189 +++++++++++++++++++++++++++++++++--------------------- 1 file changed, 116 insertions(+), 73 deletions(-) (limited to 'Modules/getpath.c') diff --git a/Modules/getpath.c b/Modules/getpath.c index a4607ef2d56..4246d4ca5ac 100644 --- a/Modules/getpath.c +++ b/Modules/getpath.c @@ -370,12 +370,15 @@ search_for_prefix(PyCalculatePath *calculate, _PyPathConfig *pathconfig, const wchar_t *argv0_path, wchar_t *prefix, size_t prefix_len, int *found) { + wchar_t path[MAXPATHLEN+1]; + memset(path, 0, sizeof(path)); + size_t path_len = Py_ARRAY_LENGTH(path); + PyStatus status; - size_t n; - wchar_t *vpath; /* If PYTHONHOME is set, we believe it unconditionally */ if (pathconfig->home) { + /* Path: / */ if (safe_wcscpy(prefix, pathconfig->home, prefix_len) < 0) { return PATHLEN_ERR(); } @@ -387,27 +390,25 @@ search_for_prefix(PyCalculatePath *calculate, _PyPathConfig *pathconfig, if (_PyStatus_EXCEPTION(status)) { return status; } - status = joinpath(prefix, LANDMARK, prefix_len); - if (_PyStatus_EXCEPTION(status)) { - return status; - } *found = 1; return _PyStatus_OK(); } /* Check to see if argv[0] is in the build directory */ - if (safe_wcscpy(prefix, argv0_path, prefix_len) < 0) { + if (safe_wcscpy(path, argv0_path, path_len) < 0) { return PATHLEN_ERR(); } - status = joinpath(prefix, L"Modules/Setup.local", prefix_len); + status = joinpath(path, L"Modules/Setup.local", path_len); if (_PyStatus_EXCEPTION(status)) { return status; } - if (isfile(prefix)) { - /* Check VPATH to see if argv0_path is in the build directory. */ - vpath = Py_DecodeLocale(VPATH, NULL); + if (isfile(path)) { + /* Check VPATH to see if argv0_path is in the build directory. + VPATH can be empty. */ + wchar_t *vpath = Py_DecodeLocale(VPATH, NULL); if (vpath != NULL) { + /* Path: / / Lib / LANDMARK */ if (safe_wcscpy(prefix, argv0_path, prefix_len) < 0) { return PATHLEN_ERR(); } @@ -428,6 +429,7 @@ search_for_prefix(PyCalculatePath *calculate, _PyPathConfig *pathconfig, if (ismodule(prefix, prefix_len)) { *found = -1; + reduce(prefix); return _PyStatus_OK(); } } @@ -440,7 +442,8 @@ search_for_prefix(PyCalculatePath *calculate, _PyPathConfig *pathconfig, } do { - n = wcslen(prefix); + /* Path: / / LANDMARK */ + size_t n = wcslen(prefix); status = joinpath(prefix, calculate->lib_python, prefix_len); if (_PyStatus_EXCEPTION(status)) { return status; @@ -452,13 +455,15 @@ search_for_prefix(PyCalculatePath *calculate, _PyPathConfig *pathconfig, if (ismodule(prefix, prefix_len)) { *found = 1; + reduce(prefix); return _PyStatus_OK(); } prefix[n] = L'\0'; reduce(prefix); } while (prefix[0]); - /* Look at configure's PREFIX */ + /* Look at configure's PREFIX. + Path: / / LANDMARK */ if (safe_wcscpy(prefix, calculate->prefix, prefix_len) < 0) { return PATHLEN_ERR(); } @@ -473,6 +478,7 @@ search_for_prefix(PyCalculatePath *calculate, _PyPathConfig *pathconfig, if (ismodule(prefix, prefix_len)) { *found = 1; + reduce(prefix); return _PyStatus_OK(); } @@ -509,9 +515,6 @@ calculate_prefix(PyCalculatePath *calculate, _PyPathConfig *pathconfig, return status; } } - else { - reduce(prefix); - } return _PyStatus_OK(); } @@ -546,6 +549,67 @@ calculate_set_prefix(PyCalculatePath *calculate, _PyPathConfig *pathconfig, } +static PyStatus +calculate_pybuilddir(const wchar_t *argv0_path, + wchar_t *exec_prefix, size_t exec_prefix_len, + int *found) +{ + PyStatus status; + + wchar_t filename[MAXPATHLEN+1]; + memset(filename, 0, sizeof(filename)); + size_t filename_len = Py_ARRAY_LENGTH(filename); + + /* Check to see if argv[0] is in the build directory. "pybuilddir.txt" + is written by setup.py and contains the relative path to the location + of shared library modules. + + Filename: / "pybuilddir.txt" */ + if (safe_wcscpy(filename, argv0_path, filename_len) < 0) { + return PATHLEN_ERR(); + } + status = joinpath(filename, L"pybuilddir.txt", filename_len); + if (_PyStatus_EXCEPTION(status)) { + return status; + } + + if (!isfile(filename)) { + return _PyStatus_OK(); + } + + FILE *fp = _Py_wfopen(filename, L"rb"); + if (fp == NULL) { + errno = 0; + return _PyStatus_OK(); + } + + char buf[MAXPATHLEN + 1]; + size_t n = fread(buf, 1, Py_ARRAY_LENGTH(buf) - 1, fp); + buf[n] = '\0'; + fclose(fp); + + size_t dec_len; + wchar_t *pybuilddir = _Py_DecodeUTF8_surrogateescape(buf, n, &dec_len); + if (!pybuilddir) { + return DECODE_LOCALE_ERR("pybuilddir.txt", dec_len); + } + + /* Path: / */ + if (safe_wcscpy(exec_prefix, argv0_path, exec_prefix_len) < 0) { + PyMem_RawFree(pybuilddir); + return PATHLEN_ERR(); + } + status = joinpath(exec_prefix, pybuilddir, exec_prefix_len); + PyMem_RawFree(pybuilddir); + if (_PyStatus_EXCEPTION(status)) { + return status; + } + + *found = -1; + return _PyStatus_OK(); +} + + /* search_for_exec_prefix requires that argv0_path be no more than MAXPATHLEN bytes long. */ @@ -556,10 +620,10 @@ search_for_exec_prefix(PyCalculatePath *calculate, _PyPathConfig *pathconfig, int *found) { PyStatus status; - size_t n; /* If PYTHONHOME is set, we believe it unconditionally */ if (pathconfig->home) { + /* Path: / / "lib-dynload" */ wchar_t *delim = wcschr(pathconfig->home, DELIM); if (delim) { if (safe_wcscpy(exec_prefix, delim+1, exec_prefix_len) < 0) { @@ -583,47 +647,15 @@ search_for_exec_prefix(PyCalculatePath *calculate, _PyPathConfig *pathconfig, return _PyStatus_OK(); } - /* Check to see if argv[0] is in the build directory. "pybuilddir.txt" - is written by setup.py and contains the relative path to the location - of shared library modules. */ - if (safe_wcscpy(exec_prefix, argv0_path, exec_prefix_len) < 0) { - return PATHLEN_ERR(); - } - status = joinpath(exec_prefix, L"pybuilddir.txt", exec_prefix_len); + /* Check for pybuilddir.txt */ + assert(*found == 0); + status = calculate_pybuilddir(argv0_path, exec_prefix, exec_prefix_len, + found); if (_PyStatus_EXCEPTION(status)) { return status; } - - if (isfile(exec_prefix)) { - FILE *f = _Py_wfopen(exec_prefix, L"rb"); - if (f == NULL) { - errno = 0; - } - else { - char buf[MAXPATHLEN + 1]; - n = fread(buf, 1, Py_ARRAY_LENGTH(buf) - 1, f); - buf[n] = '\0'; - fclose(f); - - wchar_t *pybuilddir; - size_t dec_len; - pybuilddir = _Py_DecodeUTF8_surrogateescape(buf, n, &dec_len); - if (!pybuilddir) { - return DECODE_LOCALE_ERR("pybuilddir.txt", dec_len); - } - - if (safe_wcscpy(exec_prefix, argv0_path, exec_prefix_len) < 0) { - return PATHLEN_ERR(); - } - status = joinpath(exec_prefix, pybuilddir, exec_prefix_len); - PyMem_RawFree(pybuilddir ); - if (_PyStatus_EXCEPTION(status)) { - return status; - } - - *found = -1; - return _PyStatus_OK(); - } + if (*found) { + return _PyStatus_OK(); } /* Search from argv0_path, until root is found */ @@ -633,7 +665,8 @@ search_for_exec_prefix(PyCalculatePath *calculate, _PyPathConfig *pathconfig, } do { - n = wcslen(exec_prefix); + /* Path: / / "lib-dynload" */ + size_t n = wcslen(exec_prefix); status = joinpath(exec_prefix, calculate->lib_python, exec_prefix_len); if (_PyStatus_EXCEPTION(status)) { return status; @@ -650,7 +683,9 @@ search_for_exec_prefix(PyCalculatePath *calculate, _PyPathConfig *pathconfig, reduce(exec_prefix); } while (exec_prefix[0]); - /* Look at configure's EXEC_PREFIX */ + /* Look at configure's EXEC_PREFIX. + + Path: / / "lib-dynload" */ if (safe_wcscpy(exec_prefix, calculate->exec_prefix, exec_prefix_len) < 0) { return PATHLEN_ERR(); } @@ -962,43 +997,49 @@ calculate_read_pyenv(PyCalculatePath *calculate, wchar_t *argv0_path, size_t argv0_path_len) { PyStatus status; - wchar_t tmpbuffer[MAXPATHLEN+1]; - const size_t buflen = Py_ARRAY_LENGTH(tmpbuffer); - wchar_t *env_cfg = L"pyvenv.cfg"; + const wchar_t *env_cfg = L"pyvenv.cfg"; FILE *env_file; - if (safe_wcscpy(tmpbuffer, argv0_path, buflen) < 0) { + wchar_t filename[MAXPATHLEN+1]; + const size_t filename_len = Py_ARRAY_LENGTH(filename); + memset(filename, 0, sizeof(filename)); + + /* Filename: / "pyvenv.cfg" */ + if (safe_wcscpy(filename, argv0_path, filename_len) < 0) { return PATHLEN_ERR(); } - status = joinpath(tmpbuffer, env_cfg, buflen); + status = joinpath(filename, env_cfg, filename_len); if (_PyStatus_EXCEPTION(status)) { return status; } - env_file = _Py_wfopen(tmpbuffer, L"r"); + env_file = _Py_wfopen(filename, L"r"); if (env_file == NULL) { errno = 0; - reduce(tmpbuffer); - reduce(tmpbuffer); - status = joinpath(tmpbuffer, env_cfg, buflen); + /* Filename: / "pyvenv.cfg" */ + reduce(filename); + reduce(filename); + status = joinpath(filename, env_cfg, filename_len); if (_PyStatus_EXCEPTION(status)) { return status; } - env_file = _Py_wfopen(tmpbuffer, L"r"); + env_file = _Py_wfopen(filename, L"r"); if (env_file == NULL) { errno = 0; + return _PyStatus_OK(); } } - if (env_file == NULL) { - return _PyStatus_OK(); - } - /* Look for a 'home' variable and set argv0_path to it, if found */ - if (_Py_FindEnvConfigValue(env_file, L"home", tmpbuffer, buflen)) { - if (safe_wcscpy(argv0_path, tmpbuffer, argv0_path_len) < 0) { + wchar_t home[MAXPATHLEN+1]; + memset(home, 0, sizeof(home)); + + if (_Py_FindEnvConfigValue(env_file, L"home", + home, Py_ARRAY_LENGTH(home))) { + if (safe_wcscpy(argv0_path, home, argv0_path_len) < 0) { + fclose(env_file); return PATHLEN_ERR(); } } @@ -1200,6 +1241,8 @@ calculate_path(PyCalculatePath *calculate, _PyPathConfig *pathconfig) return status; } + /* If a pyvenv.cfg configure file is found, + argv0_path is overriden with its 'home' variable. */ status = calculate_read_pyenv(calculate, argv0_path, Py_ARRAY_LENGTH(argv0_path)); if (_PyStatus_EXCEPTION(status)) { -- cgit v1.2.3-65-gdbad