mirror of
https://github.com/python/cpython.git
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680 lines
18 KiB
C
680 lines
18 KiB
C
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/* Return the initial module search path. */
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/* Used by DOS, OS/2, Windows 3.1, Windows 95/98, Windows NT. */
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/* ----------------------------------------------------------------
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PATH RULES FOR WINDOWS:
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This describes how sys.path is formed on Windows. It describes the
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functionality, not the implementation (ie, the order in which these
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are actually fetched is different)
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* Python always adds an empty entry at the start, which corresponds
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to the current directory.
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* If the PYTHONPATH env. var. exists, it's entries are added next.
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* We look in the registry for "application paths" - that is, sub-keys
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under the main PythonPath registry key. These are added next (the
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order of sub-key processing is undefined).
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HKEY_CURRENT_USER is searched and added first.
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HKEY_LOCAL_MACHINE is searched and added next.
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(Note that all known installers only use HKLM, so HKCU is typically
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empty)
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* We attempt to locate the "Python Home" - if the PYTHONHOME env var
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is set, we believe it. Otherwise, we use the path of our host .EXE's
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to try and locate our "landmark" (lib\\os.py) and deduce our home.
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- If we DO have a Python Home: The relevant sub-directories (Lib,
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plat-win, lib-tk, etc) are based on the Python Home
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- If we DO NOT have a Python Home, the core Python Path is
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loaded from the registry. This is the main PythonPath key,
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and both HKLM and HKCU are combined to form the path)
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* Iff - we can not locate the Python Home, have not had a PYTHONPATH
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specified, and can't locate any Registry entries (ie, we have _nothing_
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we can assume is a good path), a default path with relative entries is
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used (eg. .\Lib;.\plat-win, etc)
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The end result of all this is:
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* When running python.exe, or any other .exe in the main Python directory
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(either an installed version, or directly from the PCbuild directory),
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the core path is deduced, and the core paths in the registry are
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ignored. Other "application paths" in the registry are always read.
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* When Python is hosted in another exe (different directory, embedded via
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COM, etc), the Python Home will not be deduced, so the core path from
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the registry is used. Other "application paths" in the registry are
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always read.
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* If Python can't find its home and there is no registry (eg, frozen
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exe, some very strange installation setup) you get a path with
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some default, but relative, paths.
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---------------------------------------------------------------- */
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#include "Python.h"
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#include "osdefs.h"
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#ifdef MS_WINDOWS
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#include <windows.h>
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#include <tchar.h>
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#endif
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <string.h>
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/* Search in some common locations for the associated Python libraries.
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*
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* Py_GetPath() tries to return a sensible Python module search path.
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*
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* The approach is an adaptation for Windows of the strategy used in
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* ../Modules/getpath.c; it uses the Windows Registry as one of its
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* information sources.
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*/
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#ifndef LANDMARK
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#define LANDMARK "lib\\os.py"
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#endif
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static char prefix[MAXPATHLEN+1];
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static char progpath[MAXPATHLEN+1];
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static char dllpath[MAXPATHLEN+1];
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static char *module_search_path = NULL;
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static int
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is_sep(char ch) /* determine if "ch" is a separator character */
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{
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#ifdef ALTSEP
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return ch == SEP || ch == ALTSEP;
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#else
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return ch == SEP;
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#endif
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}
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/* assumes 'dir' null terminated in bounds. Never writes
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beyond existing terminator.
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*/
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static void
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reduce(char *dir)
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{
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size_t i = strlen(dir);
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while (i > 0 && !is_sep(dir[i]))
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--i;
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dir[i] = '\0';
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}
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static int
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exists(char *filename)
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{
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struct stat buf;
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return stat(filename, &buf) == 0;
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}
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/* Assumes 'filename' MAXPATHLEN+1 bytes long -
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may extend 'filename' by one character.
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*/
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static int
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ismodule(char *filename) /* Is module -- check for .pyc/.pyo too */
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{
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if (exists(filename))
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return 1;
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/* Check for the compiled version of prefix. */
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if (strlen(filename) < MAXPATHLEN) {
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strcat(filename, Py_OptimizeFlag ? "o" : "c");
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if (exists(filename))
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return 1;
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}
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return 0;
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}
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/* guarantees buffer will never overflow MAXPATHLEN+1 bytes */
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static void
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join(char *buffer, char *stuff)
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{
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size_t n, k;
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if (is_sep(stuff[0]))
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n = 0;
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else {
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n = strlen(buffer);
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if (n > 0 && !is_sep(buffer[n-1]) && n < MAXPATHLEN)
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buffer[n++] = SEP;
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}
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k = strlen(stuff);
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if (n + k > MAXPATHLEN)
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k = MAXPATHLEN - n;
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strncpy(buffer+n, stuff, k);
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buffer[n+k] = '\0';
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}
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/* gotlandmark only called by search_for_prefix, which ensures
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'prefix' is null terminated in bounds. join() ensures
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'landmark' can not overflow prefix if too long.
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*/
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static int
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gotlandmark(char *landmark)
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{
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int n, ok;
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n = strlen(prefix);
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join(prefix, landmark);
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ok = ismodule(prefix);
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prefix[n] = '\0';
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return ok;
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}
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/* assumes argv0_path is MAXPATHLEN+1 bytes long, already \0 term'd.
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assumption provided by only caller, calculate_path() */
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static int
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search_for_prefix(char *argv0_path, char *landmark)
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{
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/* Search from argv0_path, until landmark is found */
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strcpy(prefix, argv0_path);
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do {
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if (gotlandmark(landmark))
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return 1;
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reduce(prefix);
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} while (prefix[0]);
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return 0;
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}
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#ifdef MS_WINDOWS
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/* a string loaded from the DLL at startup.*/
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extern const char *PyWin_DLLVersionString;
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/* Load a PYTHONPATH value from the registry.
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Load from either HKEY_LOCAL_MACHINE or HKEY_CURRENT_USER.
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Works in both Unicode and 8bit environments. Only uses the
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Ex family of functions so it also works with Windows CE.
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Returns NULL, or a pointer that should be freed.
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XXX - this code is pretty strange, as it used to also
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work on Win16, where the buffer sizes werent available
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in advance. It could be simplied now Win16/Win32s is dead!
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*/
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static char *
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getpythonregpath(HKEY keyBase, int skipcore)
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{
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HKEY newKey = 0;
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DWORD dataSize = 0;
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DWORD numKeys = 0;
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LONG rc;
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char *retval = NULL;
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TCHAR *dataBuf = NULL;
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static const TCHAR keyPrefix[] = _T("Software\\Python\\PythonCore\\");
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static const TCHAR keySuffix[] = _T("\\PythonPath");
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size_t versionLen;
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DWORD index;
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TCHAR *keyBuf = NULL;
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TCHAR *keyBufPtr;
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TCHAR **ppPaths = NULL;
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/* Tried to use sysget("winver") but here is too early :-( */
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versionLen = _tcslen(PyWin_DLLVersionString);
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/* Space for all the chars, plus one \0 */
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keyBuf = keyBufPtr = malloc(sizeof(keyPrefix) +
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sizeof(TCHAR)*(versionLen-1) +
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sizeof(keySuffix));
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if (keyBuf==NULL) goto done;
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memcpy(keyBufPtr, keyPrefix, sizeof(keyPrefix)-sizeof(TCHAR));
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keyBufPtr += sizeof(keyPrefix)/sizeof(TCHAR) - 1;
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memcpy(keyBufPtr, PyWin_DLLVersionString, versionLen * sizeof(TCHAR));
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keyBufPtr += versionLen;
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/* NULL comes with this one! */
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memcpy(keyBufPtr, keySuffix, sizeof(keySuffix));
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/* Open the root Python key */
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rc=RegOpenKeyEx(keyBase,
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keyBuf, /* subkey */
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0, /* reserved */
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KEY_READ,
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&newKey);
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if (rc!=ERROR_SUCCESS) goto done;
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/* Find out how big our core buffer is, and how many subkeys we have */
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rc = RegQueryInfoKey(newKey, NULL, NULL, NULL, &numKeys, NULL, NULL,
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NULL, NULL, &dataSize, NULL, NULL);
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if (rc!=ERROR_SUCCESS) goto done;
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if (skipcore) dataSize = 0; /* Only count core ones if we want them! */
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/* Allocate a temp array of char buffers, so we only need to loop
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reading the registry once
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*/
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ppPaths = malloc( sizeof(TCHAR *) * numKeys );
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if (ppPaths==NULL) goto done;
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memset(ppPaths, 0, sizeof(TCHAR *) * numKeys);
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/* Loop over all subkeys, allocating a temp sub-buffer. */
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for(index=0;index<numKeys;index++) {
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TCHAR keyBuf[MAX_PATH+1];
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HKEY subKey = 0;
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DWORD reqdSize = MAX_PATH+1;
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/* Get the sub-key name */
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DWORD rc = RegEnumKeyEx(newKey, index, keyBuf, &reqdSize,
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NULL, NULL, NULL, NULL );
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if (rc!=ERROR_SUCCESS) goto done;
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/* Open the sub-key */
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rc=RegOpenKeyEx(newKey,
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keyBuf, /* subkey */
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0, /* reserved */
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KEY_READ,
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&subKey);
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if (rc!=ERROR_SUCCESS) goto done;
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/* Find the value of the buffer size, malloc, then read it */
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RegQueryValueEx(subKey, NULL, 0, NULL, NULL, &reqdSize);
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if (reqdSize) {
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ppPaths[index] = malloc(reqdSize);
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if (ppPaths[index]) {
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RegQueryValueEx(subKey, NULL, 0, NULL,
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(LPBYTE)ppPaths[index],
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&reqdSize);
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dataSize += reqdSize + 1; /* 1 for the ";" */
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}
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}
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RegCloseKey(subKey);
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}
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/* original datasize from RegQueryInfo doesn't include the \0 */
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dataBuf = malloc((dataSize+1) * sizeof(TCHAR));
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if (dataBuf) {
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TCHAR *szCur = dataBuf;
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DWORD reqdSize = dataSize;
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/* Copy our collected strings */
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for (index=0;index<numKeys;index++) {
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if (index > 0) {
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*(szCur++) = _T(';');
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dataSize--;
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}
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if (ppPaths[index]) {
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int len = _tcslen(ppPaths[index]);
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_tcsncpy(szCur, ppPaths[index], len);
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szCur += len;
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dataSize -= len;
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}
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}
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if (skipcore)
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*szCur = '\0';
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else {
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/* If we have no values, we dont need a ';' */
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if (numKeys) {
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*(szCur++) = _T(';');
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dataSize--;
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}
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/* Now append the core path entries -
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this will include the NULL
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*/
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rc = RegQueryValueEx(newKey, NULL, 0, NULL,
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(LPBYTE)szCur, &dataSize);
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}
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/* And set the result - caller must free
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If MBCS, it is fine as is. If Unicode, allocate new
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buffer and convert.
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*/
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#ifdef UNICODE
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retval = (char *)malloc(reqdSize+1);
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if (retval)
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WideCharToMultiByte(CP_ACP, 0,
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dataBuf, -1, /* source */
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retval, reqdSize+1, /* dest */
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NULL, NULL);
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free(dataBuf);
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#else
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retval = dataBuf;
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#endif
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}
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done:
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/* Loop freeing my temp buffers */
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if (ppPaths) {
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for(index=0;index<numKeys;index++)
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if (ppPaths[index]) free(ppPaths[index]);
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free(ppPaths);
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}
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if (newKey)
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RegCloseKey(newKey);
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if (keyBuf)
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free(keyBuf);
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return retval;
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}
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#endif /* MS_WINDOWS */
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static void
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get_progpath(void)
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{
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extern char *Py_GetProgramName(void);
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char *path = getenv("PATH");
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char *prog = Py_GetProgramName();
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#ifdef MS_WINDOWS
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extern HANDLE PyWin_DLLhModule;
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#ifdef UNICODE
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WCHAR wprogpath[MAXPATHLEN+1];
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/* Windows documents that GetModuleFileName() will "truncate",
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but makes no mention of the null terminator. Play it safe.
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PLUS Windows itself defines MAX_PATH as the same, but anyway...
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*/
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wprogpath[MAXPATHLEN]=_T('\0');
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if (PyWin_DLLhModule &&
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GetModuleFileName(PyWin_DLLhModule, wprogpath, MAXPATHLEN)) {
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WideCharToMultiByte(CP_ACP, 0,
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wprogpath, -1,
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dllpath, MAXPATHLEN+1,
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NULL, NULL);
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}
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wprogpath[MAXPATHLEN]=_T('\0');
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if (GetModuleFileName(NULL, wprogpath, MAXPATHLEN)) {
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WideCharToMultiByte(CP_ACP, 0,
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wprogpath, -1,
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progpath, MAXPATHLEN+1,
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NULL, NULL);
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return;
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}
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#else
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/* static init of progpath ensures final char remains \0 */
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if (PyWin_DLLhModule)
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if (!GetModuleFileName(PyWin_DLLhModule, dllpath, MAXPATHLEN))
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dllpath[0] = 0;
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if (GetModuleFileName(NULL, progpath, MAXPATHLEN))
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return;
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#endif
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#endif
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if (prog == NULL || *prog == '\0')
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prog = "python";
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/* If there is no slash in the argv0 path, then we have to
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* assume python is on the user's $PATH, since there's no
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* other way to find a directory to start the search from. If
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* $PATH isn't exported, you lose.
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*/
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#ifdef ALTSEP
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if (strchr(prog, SEP) || strchr(prog, ALTSEP))
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#else
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if (strchr(prog, SEP))
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#endif
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strncpy(progpath, prog, MAXPATHLEN);
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else if (path) {
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while (1) {
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char *delim = strchr(path, DELIM);
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if (delim) {
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size_t len = delim - path;
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/* ensure we can't overwrite buffer */
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len = min(MAXPATHLEN,len);
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strncpy(progpath, path, len);
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*(progpath + len) = '\0';
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}
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else
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strncpy(progpath, path, MAXPATHLEN);
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/* join() is safe for MAXPATHLEN+1 size buffer */
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join(progpath, prog);
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if (exists(progpath))
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break;
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if (!delim) {
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progpath[0] = '\0';
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break;
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}
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path = delim + 1;
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}
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}
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else
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progpath[0] = '\0';
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}
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static void
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calculate_path(void)
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{
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char argv0_path[MAXPATHLEN+1];
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char *buf;
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size_t bufsz;
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char *pythonhome = Py_GetPythonHome();
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char *envpath = Py_GETENV("PYTHONPATH");
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#ifdef MS_WINDOWS
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int skiphome, skipdefault;
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char *machinepath = NULL;
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char *userpath = NULL;
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char zip_path[MAXPATHLEN+1];
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size_t len;
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#endif
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get_progpath();
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/* progpath guaranteed \0 terminated in MAXPATH+1 bytes. */
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strcpy(argv0_path, progpath);
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reduce(argv0_path);
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if (pythonhome == NULL || *pythonhome == '\0') {
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if (search_for_prefix(argv0_path, LANDMARK))
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pythonhome = prefix;
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else
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pythonhome = NULL;
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}
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else
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strncpy(prefix, pythonhome, MAXPATHLEN);
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if (envpath && *envpath == '\0')
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envpath = NULL;
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#ifdef MS_WINDOWS
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/* Calculate zip archive path */
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if (dllpath[0]) /* use name of python DLL */
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strncpy(zip_path, dllpath, MAXPATHLEN);
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else /* use name of executable program */
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strncpy(zip_path, progpath, MAXPATHLEN);
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zip_path[MAXPATHLEN] = '\0';
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len = strlen(zip_path);
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if (len > 4) {
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zip_path[len-3] = 'z'; /* change ending to "zip" */
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zip_path[len-2] = 'i';
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zip_path[len-1] = 'p';
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}
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else {
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zip_path[0] = 0;
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}
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skiphome = pythonhome==NULL ? 0 : 1;
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machinepath = getpythonregpath(HKEY_LOCAL_MACHINE, skiphome);
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userpath = getpythonregpath(HKEY_CURRENT_USER, skiphome);
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/* We only use the default relative PYTHONPATH if we havent
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anything better to use! */
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skipdefault = envpath!=NULL || pythonhome!=NULL || \
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machinepath!=NULL || userpath!=NULL;
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#endif
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/* We need to construct a path from the following parts.
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(1) the PYTHONPATH environment variable, if set;
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(2) for Win32, the zip archive file path;
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(3) for Win32, the machinepath and userpath, if set;
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(4) the PYTHONPATH config macro, with the leading "."
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of each component replaced with pythonhome, if set;
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(5) the directory containing the executable (argv0_path).
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The length calculation calculates #4 first.
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Extra rules:
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- If PYTHONHOME is set (in any way) item (3) is ignored.
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- If registry values are used, (4) and (5) are ignored.
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*/
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/* Calculate size of return buffer */
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if (pythonhome != NULL) {
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char *p;
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bufsz = 1;
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for (p = PYTHONPATH; *p; p++) {
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if (*p == DELIM)
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bufsz++; /* number of DELIM plus one */
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}
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bufsz *= strlen(pythonhome);
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}
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else
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bufsz = 0;
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bufsz += strlen(PYTHONPATH) + 1;
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bufsz += strlen(argv0_path) + 1;
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#ifdef MS_WINDOWS
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if (userpath)
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bufsz += strlen(userpath) + 1;
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if (machinepath)
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bufsz += strlen(machinepath) + 1;
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bufsz += strlen(zip_path) + 1;
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#endif
|
|
if (envpath != NULL)
|
|
bufsz += strlen(envpath) + 1;
|
|
|
|
module_search_path = buf = malloc(bufsz);
|
|
if (buf == NULL) {
|
|
/* We can't exit, so print a warning and limp along */
|
|
fprintf(stderr, "Can't malloc dynamic PYTHONPATH.\n");
|
|
if (envpath) {
|
|
fprintf(stderr, "Using environment $PYTHONPATH.\n");
|
|
module_search_path = envpath;
|
|
}
|
|
else {
|
|
fprintf(stderr, "Using default static path.\n");
|
|
module_search_path = PYTHONPATH;
|
|
}
|
|
#ifdef MS_WINDOWS
|
|
if (machinepath)
|
|
free(machinepath);
|
|
if (userpath)
|
|
free(userpath);
|
|
#endif /* MS_WINDOWS */
|
|
return;
|
|
}
|
|
|
|
if (envpath) {
|
|
strcpy(buf, envpath);
|
|
buf = strchr(buf, '\0');
|
|
*buf++ = DELIM;
|
|
}
|
|
#ifdef MS_WINDOWS
|
|
if (zip_path[0]) {
|
|
strcpy(buf, zip_path);
|
|
buf = strchr(buf, '\0');
|
|
*buf++ = DELIM;
|
|
}
|
|
if (userpath) {
|
|
strcpy(buf, userpath);
|
|
buf = strchr(buf, '\0');
|
|
*buf++ = DELIM;
|
|
free(userpath);
|
|
}
|
|
if (machinepath) {
|
|
strcpy(buf, machinepath);
|
|
buf = strchr(buf, '\0');
|
|
*buf++ = DELIM;
|
|
free(machinepath);
|
|
}
|
|
if (pythonhome == NULL) {
|
|
if (!skipdefault) {
|
|
strcpy(buf, PYTHONPATH);
|
|
buf = strchr(buf, '\0');
|
|
}
|
|
}
|
|
#else
|
|
if (pythonhome == NULL) {
|
|
strcpy(buf, PYTHONPATH);
|
|
buf = strchr(buf, '\0');
|
|
}
|
|
#endif /* MS_WINDOWS */
|
|
else {
|
|
char *p = PYTHONPATH;
|
|
char *q;
|
|
size_t n;
|
|
for (;;) {
|
|
q = strchr(p, DELIM);
|
|
if (q == NULL)
|
|
n = strlen(p);
|
|
else
|
|
n = q-p;
|
|
if (p[0] == '.' && is_sep(p[1])) {
|
|
strcpy(buf, pythonhome);
|
|
buf = strchr(buf, '\0');
|
|
p++;
|
|
n--;
|
|
}
|
|
strncpy(buf, p, n);
|
|
buf += n;
|
|
if (q == NULL)
|
|
break;
|
|
*buf++ = DELIM;
|
|
p = q+1;
|
|
}
|
|
}
|
|
if (argv0_path) {
|
|
*buf++ = DELIM;
|
|
strcpy(buf, argv0_path);
|
|
buf = strchr(buf, '\0');
|
|
}
|
|
*buf = '\0';
|
|
/* Now to pull one last hack/trick. If sys.prefix is
|
|
empty, then try and find it somewhere on the paths
|
|
we calculated. We scan backwards, as our general policy
|
|
is that Python core directories are at the *end* of
|
|
sys.path. We assume that our "lib" directory is
|
|
on the path, and that our 'prefix' directory is
|
|
the parent of that.
|
|
*/
|
|
if (*prefix=='\0') {
|
|
char lookBuf[MAXPATHLEN+1];
|
|
char *look = buf - 1; /* 'buf' is at the end of the buffer */
|
|
while (1) {
|
|
int nchars;
|
|
char *lookEnd = look;
|
|
/* 'look' will end up one character before the
|
|
start of the path in question - even if this
|
|
is one character before the start of the buffer
|
|
*/
|
|
while (*look != DELIM && look >= module_search_path)
|
|
look--;
|
|
nchars = lookEnd-look;
|
|
strncpy(lookBuf, look+1, nchars);
|
|
lookBuf[nchars] = '\0';
|
|
/* Up one level to the parent */
|
|
reduce(lookBuf);
|
|
if (search_for_prefix(lookBuf, LANDMARK)) {
|
|
break;
|
|
}
|
|
/* If we are out of paths to search - give up */
|
|
if (look < module_search_path)
|
|
break;
|
|
look--;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/* External interface */
|
|
|
|
char *
|
|
Py_GetPath(void)
|
|
{
|
|
if (!module_search_path)
|
|
calculate_path();
|
|
return module_search_path;
|
|
}
|
|
|
|
char *
|
|
Py_GetPrefix(void)
|
|
{
|
|
if (!module_search_path)
|
|
calculate_path();
|
|
return prefix;
|
|
}
|
|
|
|
char *
|
|
Py_GetExecPrefix(void)
|
|
{
|
|
return Py_GetPrefix();
|
|
}
|
|
|
|
char *
|
|
Py_GetProgramFullPath(void)
|
|
{
|
|
if (!module_search_path)
|
|
calculate_path();
|
|
return progpath;
|
|
}
|