554 lines
14 KiB
C
554 lines
14 KiB
C
/***********************************************************
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Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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The Netherlands.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the names of Stichting Mathematisch
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Centrum or CWI or Corporation for National Research Initiatives or
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CNRI not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior
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permission.
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While CWI is the initial source for this software, a modified version
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is made available by the Corporation for National Research Initiatives
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(CNRI) at the Internet address ftp://ftp.python.org.
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STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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PERFORMANCE OF THIS SOFTWARE.
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******************************************************************/
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/* Return the initial module search path. */
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#include "Python.h"
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#include "osdefs.h"
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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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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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/* Search in some common locations for the associated Python libraries.
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*
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* Two directories must be found, the platform independent directory
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* (prefix), containing the common .py and .pyc files, and the platform
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* dependent directory (exec_prefix), containing the shared library
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* modules. Note that prefix and exec_prefix can be the same directory,
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* but for some installations, they are different.
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*
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* Py_GetPath() carries out separate searches for prefix and exec_prefix.
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* Each search tries a number of different locations until a ``landmark''
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* file or directory is found. If no prefix or exec_prefix is found, a
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* warning message is issued and the preprocessor defined PREFIX and
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* EXEC_PREFIX are used (even though they will not work); python carries on
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* as best as is possible, but most imports will fail.
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*
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* Before any searches are done, the location of the executable is
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* determined. If argv[0] has one or more slashs in it, it is used
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* unchanged. Otherwise, it must have been invoked from the shell's path,
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* so we search $PATH for the named executable and use that. If the
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* executable was not found on $PATH (or there was no $PATH environment
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* variable), the original argv[0] string is used.
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*
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* Next, the executable location is examined to see if it is a symbolic
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* link. If so, the link is chased (correctly interpreting a relative
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* pathname if one is found) and the directory of the link target is used.
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*
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* Finally, argv0_path is set to the directory containing the executable
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* (i.e. the last component is stripped).
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*
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* With argv0_path in hand, we perform a number of steps. The same steps
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* are performed for prefix and for exec_prefix, but with a different
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* landmark.
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*
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* Step 1. Are we running python out of the build directory? This is
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* checked by looking for a different kind of landmark relative to
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* argv0_path. For prefix, the landmark's path is derived from the VPATH
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* preprocessor variable (taking into account that its value is almost, but
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* not quite, what we need). For exec_prefix, the landmark is
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* Modules/Setup. If the landmark is found, we're done.
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*
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* For the remaining steps, the prefix landmark will always be
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* lib/python$VERSION/string.py and the exec_prefix will always be
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* lib/python$VERSION/sharedmodules, where $VERSION is Python's version
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* number as supplied by the Makefile. Note that this means that no more
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* build directory checking is performed; if the first step did not find
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* the landmarks, the assumption is that python is running from an
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* installed setup.
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*
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* Step 2. See if the $PYTHONHOME environment variable points to the
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* installed location of the Python libraries. If $PYTHONHOME is set, then
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* it points to prefix and exec_prefix. $PYTHONHOME can be a single
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* directory, which is used for both, or the prefix and exec_prefix
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* directories separated by a colon.
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*
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* Step 3. Try to find prefix and exec_prefix relative to argv0_path,
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* backtracking up the path until it is exhausted. This is the most common
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* step to succeed. Note that if prefix and exec_prefix are different,
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* exec_prefix is more likely to be found; however if exec_prefix is a
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* subdirectory of prefix, both will be found.
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*
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* Step 4. Search the directories pointed to by the preprocessor variables
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* PREFIX and EXEC_PREFIX. These are supplied by the Makefile but can be
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* passed in as options to the configure script.
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*
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* That's it!
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*
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* Well, almost. Once we have determined prefix and exec_prefix, the
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* preprocesor variable PYTHONPATH is used to construct a path. Each
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* relative path on PYTHONPATH is prefixed with prefix. Then the directory
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* containing the shared library modules is appended. The environment
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* variable $PYTHONPATH is inserted in front of it all. Finally, the
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* prefix and exec_prefix globals are tweaked so they reflect the values
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* expected by other code, by stripping the "lib/python$VERSION/..." stuff
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* off. If either points to the build directory, the globals are reset to
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* the corresponding preprocessor variables (so sys.prefix will reflect the
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* installation location, even though sys.path points into the build
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* directory). This seems to make more sense given that currently the only
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* known use of sys.prefix and sys.exec_prefix is for the ILU installation
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* process to find the installed Python tree.
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*/
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#ifndef VERSION
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#define VERSION "1.5"
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#endif
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#ifndef VPATH
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#define VPATH "."
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#endif
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#ifndef PREFIX
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#define PREFIX "/usr/local"
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#endif
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#ifndef EXEC_PREFIX
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#define EXEC_PREFIX PREFIX
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#endif
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#ifndef PYTHONPATH
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/* I know this isn't K&R C, but the Makefile specifies it anyway */
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#define PYTHONPATH PREFIX "/lib/python" VERSION ":" \
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PREFIX "/lib/python" VERSION "/test" ":" \
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EXEC_PREFIX "/lib/python" VERSION "/sharedmodules"
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#endif
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#ifndef LANDMARK
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#define LANDMARK "string.py"
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#endif
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static char prefix[MAXPATHLEN+1];
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static char exec_prefix[MAXPATHLEN+1];
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static char progpath[MAXPATHLEN+1];
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static char *module_search_path = NULL;
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static char lib_python[20]; /* Dynamically set to "lib/python" VERSION */
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static void
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reduce(dir)
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char *dir;
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{
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int i = strlen(dir);
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while (i > 0 && dir[i] != SEP)
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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(filename)
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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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static void
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join(buffer, stuff)
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char *buffer;
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char *stuff;
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{
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int n, k;
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if (stuff[0] == SEP)
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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 && buffer[n-1] != SEP && 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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static int
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search_for_prefix(argv0_path, home)
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char *argv0_path;
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char *home;
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{
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int n;
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char *vpath;
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/* Check to see if argv[0] is in the build directory */
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strcpy(prefix, argv0_path);
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join(prefix, "Modules/Setup");
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if (exists(prefix)) {
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/* Check VPATH to see if argv0_path is in the build directory.
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* Complication: the VPATH passed in is relative to the
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* Modules build directory and points to the Modules source
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* directory; we need it relative to the build tree and
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* pointing to the source tree. Solution: chop off a leading
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* ".." (but only if it's there -- it could be an absolute
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* path) and chop off the final component (assuming it's
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* "Modules").
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*/
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vpath = VPATH;
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if (vpath[0] == '.' && vpath[1] == '.' && vpath[2] == '/')
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vpath += 3;
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strcpy(prefix, argv0_path);
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join(prefix, vpath);
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reduce(prefix);
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join(prefix, "Lib");
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join(prefix, LANDMARK);
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if (exists(prefix))
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return -1;
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}
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if (home) {
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/* Check $PYTHONHOME */
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char *delim;
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strcpy(prefix, home);
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delim = strchr(prefix, DELIM);
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if (delim)
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*delim = '\0';
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join(prefix, lib_python);
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join(prefix, LANDMARK);
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if (exists(prefix))
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return 1;
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}
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/* Search from argv0_path, until root is found */
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strcpy(prefix, argv0_path);
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do {
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n = strlen(prefix);
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join(prefix, lib_python);
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join(prefix, LANDMARK);
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if (exists(prefix))
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return 1;
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prefix[n] = '\0';
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reduce(prefix);
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} while (prefix[0]);
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/* Look at configure's PREFIX */
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strcpy(prefix, PREFIX);
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join(prefix, lib_python);
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join(prefix, LANDMARK);
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if (exists(prefix))
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return 1;
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/* Fail */
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return 0;
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}
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static int
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search_for_exec_prefix(argv0_path, home)
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char *argv0_path;
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char *home;
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{
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int n;
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/* Check to see if argv[0] is in the build directory */
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strcpy(exec_prefix, argv0_path);
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join(exec_prefix, "Modules/Setup");
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if (exists(exec_prefix)) {
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reduce(exec_prefix);
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return -1;
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}
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if (home) {
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/* Check $PYTHONHOME */
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char *delim;
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delim = strchr(home, DELIM);
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if (delim)
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strcpy(exec_prefix, delim+1);
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else
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strcpy(exec_prefix, home);
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join(exec_prefix, lib_python);
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join(exec_prefix, "sharedmodules");
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if (exists(exec_prefix))
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return 1;
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}
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/* Search from argv0_path, until root is found */
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strcpy(exec_prefix, argv0_path);
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do {
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n = strlen(exec_prefix);
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join(exec_prefix, lib_python);
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join(exec_prefix, "sharedmodules");
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if (exists(exec_prefix))
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return 1;
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exec_prefix[n] = '\0';
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reduce(exec_prefix);
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} while (exec_prefix[0]);
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/* Look at configure's EXEC_PREFIX */
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strcpy(exec_prefix, EXEC_PREFIX);
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join(exec_prefix, lib_python);
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join(exec_prefix, "sharedmodules");
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if (exists(exec_prefix))
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return 1;
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/* Fail */
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return 0;
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}
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static void
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calculate_path()
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{
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extern char *Py_GetProgramName();
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static char delimiter[2] = {DELIM, '\0'};
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static char separator[2] = {SEP, '\0'};
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char *pythonpath = PYTHONPATH;
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char *rtpypath = getenv("PYTHONPATH");
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char *home = getenv("PYTHONHOME");
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char *path = getenv("PATH");
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char *prog = Py_GetProgramName();
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char argv0_path[MAXPATHLEN+1];
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int pfound, efound; /* 1 if found; -1 if found build directory */
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char *buf;
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int bufsz;
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int prefixsz;
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char *defpath = pythonpath;
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/* Initialize this dynamically for K&R C */
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sprintf(lib_python, "lib/python%s", VERSION);
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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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if (strchr(prog, SEP))
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strcpy(progpath, prog);
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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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int len = delim - path;
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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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strcpy(progpath, path);
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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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strcpy(argv0_path, progpath);
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#if HAVE_READLINK
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{
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char tmpbuffer[MAXPATHLEN+1];
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int linklen = readlink(progpath, tmpbuffer, MAXPATHLEN);
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if (linklen != -1) {
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/* It's not null terminated! */
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tmpbuffer[linklen] = '\0';
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if (tmpbuffer[0] == SEP)
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strcpy(argv0_path, tmpbuffer);
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else {
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/* Interpret relative to progpath */
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reduce(argv0_path);
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join(argv0_path, tmpbuffer);
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}
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}
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}
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#endif /* HAVE_READLINK */
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reduce(argv0_path);
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if (!(pfound = search_for_prefix(argv0_path, home))) {
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fprintf(stderr,
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"Could not find platform independent libraries <prefix>\n");
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strcpy(prefix, PREFIX);
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join(prefix, lib_python);
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}
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else
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reduce(prefix);
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if (!(efound = search_for_exec_prefix(argv0_path, home))) {
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fprintf(stderr,
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"Could not find platform dependent libraries <exec_prefix>\n");
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strcpy(exec_prefix, EXEC_PREFIX);
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join(exec_prefix, "lib/sharedmodules");
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}
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/* If we found EXEC_PREFIX do *not* reduce it! (Yet.) */
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if (!pfound || !efound)
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fprintf(stderr,
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"Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]\n");
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/* Calculate size of return buffer.
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*/
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bufsz = 0;
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if (rtpypath)
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bufsz += strlen(rtpypath) + 1;
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prefixsz = strlen(prefix) + 1;
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while (1) {
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char *delim = strchr(defpath, DELIM);
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if (defpath[0] != SEP)
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/* Paths are relative to prefix */
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bufsz += prefixsz;
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if (delim)
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bufsz += delim - defpath + 1;
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else {
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bufsz += strlen(defpath) + 1;
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break;
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}
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defpath = delim + 1;
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}
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bufsz += strlen(exec_prefix) + 1;
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/* This is the only malloc call in this file */
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buf = malloc(bufsz);
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if (buf == NULL) {
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/* We can't exit, so print a warning and limp along */
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fprintf(stderr, "Not enough memory for dynamic PYTHONPATH.\n");
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fprintf(stderr, "Using default static PYTHONPATH.\n");
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module_search_path = PYTHONPATH;
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}
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else {
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/* Run-time value of $PYTHONPATH goes first */
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if (rtpypath) {
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strcpy(buf, rtpypath);
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strcat(buf, delimiter);
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}
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else
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buf[0] = '\0';
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/* Next goes merge of compile-time $PYTHONPATH with
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* dynamically located prefix.
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*/
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defpath = pythonpath;
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while (1) {
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char *delim = strchr(defpath, DELIM);
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if (defpath[0] != SEP) {
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strcat(buf, prefix);
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strcat(buf, separator);
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}
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if (delim) {
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int len = delim - defpath + 1;
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int end = strlen(buf) + len;
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strncat(buf, defpath, len);
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*(buf + end) = '\0';
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}
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else {
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strcat(buf, defpath);
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break;
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}
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defpath = delim + 1;
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}
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strcat(buf, delimiter);
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/* Finally, on goes the directory for dynamic-load modules */
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strcat(buf, exec_prefix);
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/* And publish the results */
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module_search_path = buf;
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}
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/* Reduce prefix and exec_prefix to their essence,
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* e.g. /usr/local/lib/python1.5 is reduced to /usr/local.
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* If we're loading relative to the build directory,
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* return the compiled-in defaults instead.
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*/
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if (pfound > 0) {
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reduce(prefix);
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reduce(prefix);
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}
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else
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strcpy(prefix, PREFIX);
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if (efound > 0) {
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reduce(exec_prefix);
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reduce(exec_prefix);
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reduce(exec_prefix);
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}
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else
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strcpy(exec_prefix, EXEC_PREFIX);
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}
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/* External interface */
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char *
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Py_GetPath()
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{
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if (!module_search_path)
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calculate_path();
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return module_search_path;
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}
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char *
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Py_GetPrefix()
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{
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if (!module_search_path)
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calculate_path();
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return prefix;
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}
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char *
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Py_GetExecPrefix()
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{
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if (!module_search_path)
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calculate_path();
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return exec_prefix;
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}
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char *
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Py_GetProgramFullPath()
|
|
{
|
|
if (!module_search_path)
|
|
calculate_path();
|
|
return progpath;
|
|
}
|