diff options
Diffstat (limited to 'PC/getpathp.c')
| -rw-r--r-- | PC/getpathp.c | 181 |
1 files changed, 115 insertions, 66 deletions
diff --git a/PC/getpathp.c b/PC/getpathp.c index cb9f1db..5df9d7d 100644 --- a/PC/getpathp.c +++ b/PC/getpathp.c @@ -6,7 +6,8 @@ PATH RULES FOR WINDOWS: This describes how sys.path is formed on Windows. It describes the functionality, not the implementation (ie, the order in which these - are actually fetched is different) + are actually fetched is different). The presence of a sys.path file + alongside the program overrides these rules - see below. * Python always adds an empty entry at the start, which corresponds to the current directory. @@ -36,6 +37,12 @@ used (eg. .\Lib;.\plat-win, etc) + If a sys.path file exists adjacent to python.exe, it must contain a + list of paths to add to sys.path, one per line (like a .pth file but without + the ability to execute arbitrary code). Each path is relative to the + directory containing the file. No other paths are added to the search path, + and the registry finder is not enabled. + The end result of all this is: * When running python.exe, or any other .exe in the main Python directory (either an installed version, or directly from the PCbuild directory), @@ -52,7 +59,10 @@ some default, but relative, paths. * An embedding application can use Py_SetPath() to override all of - these authomatic path computations. + these automatic path computations. + + * An isolation install of Python can disable all implicit paths by + providing a sys.path file. ---------------------------------------------------------------- */ @@ -61,10 +71,13 @@ #include "osdefs.h" #include <wchar.h> -#ifdef MS_WINDOWS -#include <windows.h> +#ifndef MS_WINDOWS +#error getpathp.c should only be built on Windows #endif +#include <windows.h> +#include <Shlwapi.h> + #ifdef HAVE_SYS_TYPES_H #include <sys/types.h> #endif /* HAVE_SYS_TYPES_H */ @@ -163,24 +176,30 @@ ismodule(wchar_t *filename, int update_filename) /* Is module -- check for .pyc/ than MAXPATHLEN characters at exit. If stuff is too long, only as much of stuff as fits will be appended. */ + +static int _PathCchCombineEx_Initialized = 0; +typedef HRESULT(__stdcall *PPathCchCombineEx)(PWSTR pszPathOut, size_t cchPathOut, PCWSTR pszPathIn, PCWSTR pszMore, unsigned long dwFlags); +static PPathCchCombineEx _PathCchCombineEx; + static void join(wchar_t *buffer, const wchar_t *stuff) { - size_t n; - if (is_sep(stuff[0]) || - (wcsnlen_s(stuff, 4) >= 3 && stuff[1] == ':' && is_sep(stuff[2]))) { - if (wcscpy_s(buffer, MAXPATHLEN+1, stuff) != 0) - Py_FatalError("buffer overflow in getpathp.c's join()"); - return; + if (_PathCchCombineEx_Initialized == 0) { + HMODULE pathapi = LoadLibraryW(L"api-ms-win-core-path-l1-1-0.dll"); + if (pathapi) + _PathCchCombineEx = (PPathCchCombineEx)GetProcAddress(pathapi, "PathCchCombineEx"); + else + _PathCchCombineEx = NULL; + _PathCchCombineEx_Initialized = 1; } - n = wcsnlen_s(buffer, MAXPATHLEN+1); - if (n > 0 && !is_sep(buffer[n - 1]) && n < MAXPATHLEN) { - buffer[n] = SEP; - buffer[n + 1] = '\0'; + if (_PathCchCombineEx) { + if (FAILED(_PathCchCombineEx(buffer, MAXPATHLEN+1, buffer, stuff, 0))) + Py_FatalError("buffer overflow in getpathp.c's join()"); + } else { + if (!PathCombineW(buffer, NULL, stuff)) + Py_FatalError("buffer overflow in getpathp.c's join()"); } - if (wcscat_s(buffer, MAXPATHLEN+1, stuff) != 0) - Py_FatalError("buffer overflow in getpathp.c's join()"); } /* gotlandmark only called by search_for_prefix, which ensures @@ -214,7 +233,6 @@ search_for_prefix(wchar_t *argv0_path, wchar_t *landmark) return 0; } -#ifdef MS_WINDOWS #ifdef Py_ENABLE_SHARED /* a string loaded from the DLL at startup.*/ @@ -369,7 +387,6 @@ done: return retval; } #endif /* Py_ENABLE_SHARED */ -#endif /* MS_WINDOWS */ static void get_progpath(void) @@ -378,7 +395,6 @@ get_progpath(void) wchar_t *path = _wgetenv(L"PATH"); wchar_t *prog = Py_GetProgramName(); -#ifdef MS_WINDOWS #ifdef Py_ENABLE_SHARED extern HANDLE PyWin_DLLhModule; /* static init of progpath ensures final char remains \0 */ @@ -390,7 +406,6 @@ get_progpath(void) #endif if (GetModuleFileNameW(NULL, progpath, MAXPATHLEN)) return; -#endif if (prog == NULL || *prog == '\0') prog = L"python"; @@ -483,6 +498,67 @@ find_env_config_value(FILE * env_file, const wchar_t * key, wchar_t * value) return result; } +static int +read_sys_path_file(const wchar_t *path, const wchar_t *prefix) +{ + FILE *sp_file = _Py_wfopen(path, L"r"); + if (sp_file == NULL) + return -1; + + size_t bufsiz = MAXPATHLEN; + size_t prefixlen = wcslen(prefix); + + wchar_t *buf = (wchar_t*)PyMem_RawMalloc(bufsiz * sizeof(wchar_t)); + buf[0] = '\0'; + + while (!feof(sp_file)) { + char line[MAXPATHLEN + 1]; + char *p = fgets(line, MAXPATHLEN + 1, sp_file); + if (!p) + break; + + DWORD n = strlen(line); + if (n == 0 || p[n - 1] != '\n') + break; + if (n > 2 && p[n - 1] == '\r') + --n; + + DWORD wn = MultiByteToWideChar(CP_UTF8, 0, line, n - 1, NULL, 0); + wchar_t *wline = (wchar_t*)PyMem_RawMalloc((wn + 1) * sizeof(wchar_t)); + wn = MultiByteToWideChar(CP_UTF8, 0, line, n - 1, wline, wn); + wline[wn] = '\0'; + + while (wn + prefixlen + 4 > bufsiz) { + bufsiz += MAXPATHLEN; + buf = (wchar_t*)PyMem_RawRealloc(buf, (bufsiz + 1) * sizeof(wchar_t)); + if (!buf) { + PyMem_RawFree(wline); + goto error; + } + } + + if (buf[0]) + wcscat_s(buf, bufsiz, L";"); + wchar_t *b = &buf[wcslen(buf)]; + + wcscat_s(buf, bufsiz, prefix); + join(b, wline); + + PyMem_RawFree(wline); + } + + module_search_path = buf; + + fclose(sp_file); + return 0; + +error: + PyMem_RawFree(buf); + fclose(sp_file); + return -1; +} + + static void calculate_path(void) { @@ -492,32 +568,34 @@ calculate_path(void) wchar_t *pythonhome = Py_GetPythonHome(); wchar_t *envpath = NULL; -#ifdef MS_WINDOWS int skiphome, skipdefault; wchar_t *machinepath = NULL; wchar_t *userpath = NULL; wchar_t zip_path[MAXPATHLEN+1]; - int applocal = 0; if (!Py_IgnoreEnvironmentFlag) { envpath = _wgetenv(L"PYTHONPATH"); } -#else - char *_envpath = Py_GETENV("PYTHONPATH"); - wchar_t wenvpath[MAXPATHLEN+1]; - if (_envpath) { - size_t r = mbstowcs(wenvpath, _envpath, MAXPATHLEN+1); - envpath = wenvpath; - if (r == (size_t)-1 || r >= MAXPATHLEN) - envpath = NULL; - } -#endif get_progpath(); /* progpath guaranteed \0 terminated in MAXPATH+1 bytes. */ wcscpy_s(argv0_path, MAXPATHLEN+1, progpath); reduce(argv0_path); + /* Search for a sys.path file */ + { + wchar_t spbuffer[MAXPATHLEN+1]; + + wcscpy_s(spbuffer, MAXPATHLEN+1, argv0_path); + join(spbuffer, L"sys.path"); + if (exists(spbuffer) && read_sys_path_file(spbuffer, argv0_path) == 0) { + wcscpy_s(prefix, MAXPATHLEN + 1, argv0_path); + Py_IsolatedFlag = 1; + Py_NoSiteFlag = 1; + return; + } + } + /* Search for an environment configuration file, first in the executable's directory and then in the parent directory. If found, open it for use when searching for prefixes. @@ -543,17 +621,6 @@ calculate_path(void) } } if (env_file != NULL) { - /* Look for an 'applocal' variable and, if true, ignore all registry - * keys and environment variables, but retain the default paths - * (DLLs, Lib) and the zip file. Setting pythonhome here suppresses - * the search for LANDMARK below and overrides %PYTHONHOME%. - */ - if (find_env_config_value(env_file, L"applocal", tmpbuffer) && - (applocal = (wcsicmp(tmpbuffer, L"true") == 0))) { - envpath = NULL; - pythonhome = argv0_path; - } - /* Look for a 'home' variable and set argv0_path to it, if found */ if (find_env_config_value(env_file, L"home", tmpbuffer)) { wcscpy_s(argv0_path, MAXPATHLEN+1, tmpbuffer); @@ -576,7 +643,6 @@ calculate_path(void) envpath = NULL; -#ifdef MS_WINDOWS /* Calculate zip archive path from DLL or exe path */ if (wcscpy_s(zip_path, MAXPATHLEN+1, dllpath[0] ? dllpath : progpath)) /* exceeded buffer length - ignore zip_path */ @@ -590,16 +656,13 @@ calculate_path(void) skiphome = pythonhome==NULL ? 0 : 1; #ifdef Py_ENABLE_SHARED - if (!applocal) { - machinepath = getpythonregpath(HKEY_LOCAL_MACHINE, skiphome); - userpath = getpythonregpath(HKEY_CURRENT_USER, skiphome); - } + machinepath = getpythonregpath(HKEY_LOCAL_MACHINE, skiphome); + userpath = getpythonregpath(HKEY_CURRENT_USER, skiphome); #endif /* We only use the default relative PYTHONPATH if we havent anything better to use! */ skipdefault = envpath!=NULL || pythonhome!=NULL || \ machinepath!=NULL || userpath!=NULL; -#endif /* We need to construct a path from the following parts. (1) the PYTHONPATH environment variable, if set; @@ -612,7 +675,6 @@ calculate_path(void) Extra rules: - If PYTHONHOME is set (in any way) item (3) is ignored. - If registry values are used, (4) and (5) are ignored. - - If applocal is set, (1), (3), and registry values are ignored */ /* Calculate size of return buffer */ @@ -629,13 +691,11 @@ calculate_path(void) bufsz = 0; bufsz += wcslen(PYTHONPATH) + 1; bufsz += wcslen(argv0_path) + 1; -#ifdef MS_WINDOWS - if (!applocal && userpath) + if (userpath) bufsz += wcslen(userpath) + 1; - if (!applocal && machinepath) + if (machinepath) bufsz += wcslen(machinepath) + 1; bufsz += wcslen(zip_path) + 1; -#endif if (envpath != NULL) bufsz += wcslen(envpath) + 1; @@ -651,10 +711,8 @@ calculate_path(void) fprintf(stderr, "Using default static path.\n"); module_search_path = PYTHONPATH; } -#ifdef MS_WINDOWS PyMem_RawFree(machinepath); PyMem_RawFree(userpath); -#endif /* MS_WINDOWS */ return; } @@ -664,7 +722,6 @@ calculate_path(void) buf = wcschr(buf, L'\0'); *buf++ = DELIM; } -#ifdef MS_WINDOWS if (zip_path[0]) { if (wcscpy_s(buf, bufsz - (buf - module_search_path), zip_path)) Py_FatalError("buffer overflow in getpathp.c's calculate_path()"); @@ -692,15 +749,7 @@ calculate_path(void) buf = wcschr(buf, L'\0'); *buf++ = DELIM; } - } -#else - if (pythonhome == NULL) { - wcscpy(buf, PYTHONPATH); - buf = wcschr(buf, L'\0'); - *buf++ = DELIM; - } -#endif /* MS_WINDOWS */ - else { + } else { wchar_t *p = PYTHONPATH; wchar_t *q; size_t n; |