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bpo-38234: Cleanup getpath.c (GH-16367)

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* 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
This commit is contained in:
Victor Stinner 2019-09-25 02:54:25 +02:00 committed by GitHub
parent 52ad33abbf
commit 221fd84703
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 138 additions and 88 deletions
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7
Lib/test/pythoninfo.py
View file

@ -673,6 +673,13 @@ def collect_windows(info_add):
res = bool(RtlAreLongPathsEnabled())
info_add('windows.RtlAreLongPathsEnabled', res)
try:
import _winapi
dll_path = _winapi.GetModuleFileName(sys.dllhandle)
info_add('windows.dll_path', dll_path)
except (ImportError, AttributeError):
pass
def collect_info(info):
error = False

189
Modules/getpath.c
View file

@ -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: <home> / <lib_python> */
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: <argv0_path> / <vpath> / 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: <argv0_path or substring> / <lib_python> / 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: <PREFIX macro> / <lib_python> / 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: <argv0_path> / "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: <argv0_path> / <pybuilddir content> */
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: <home> / <lib_python> / "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: <argv0_path or substring> / <lib_python> / "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: <EXEC_PREFIX macro> / <lib_python> / "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: <argv0_path_len> / "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: <basename(basename(argv0_path_len))> / "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)) {

30
PC/getpathp.c
View file

@ -757,34 +757,34 @@ static void
calculate_pyvenv_file(PyCalculatePath *calculate,
wchar_t *argv0_path, size_t argv0_path_len)
{
wchar_t envbuffer[MAXPATHLEN+1];
wchar_t filename[MAXPATHLEN+1];
const wchar_t *env_cfg = L"pyvenv.cfg";
wcscpy_s(envbuffer, MAXPATHLEN+1, argv0_path);
join(envbuffer, env_cfg);
/* Filename: <argv0_path_len> / "pyvenv.cfg" */
wcscpy_s(filename, MAXPATHLEN+1, argv0_path);
join(filename, env_cfg);
FILE *env_file = _Py_wfopen(envbuffer, L"r");
FILE *env_file = _Py_wfopen(filename, L"r");
if (env_file == NULL) {
errno = 0;
reduce(envbuffer);
reduce(envbuffer);
join(envbuffer, env_cfg);
/* Filename: <basename(basename(argv0_path_len))> / "pyvenv.cfg" */
reduce(filename);
reduce(filename);
join(filename, env_cfg);
env_file = _Py_wfopen(envbuffer, L"r");
env_file = _Py_wfopen(filename, L"r");
if (env_file == NULL) {
errno = 0;
return;
}
}
if (env_file == NULL) {
return;
}
/* Look for a 'home' variable and set argv0_path to it, if found */
wchar_t tmpbuffer[MAXPATHLEN+1];
if (_Py_FindEnvConfigValue(env_file, L"home", tmpbuffer, MAXPATHLEN)) {
wcscpy_s(argv0_path, argv0_path_len, tmpbuffer);
wchar_t home[MAXPATHLEN+1];
if (_Py_FindEnvConfigValue(env_file, L"home",
home, Py_ARRAY_LENGTH(home))) {
wcscpy_s(argv0_path, argv0_path_len, home);
}
fclose(env_file);
}