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Implemented PEP 405 (Python virtual environments).
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parent
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commit
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41 changed files with 1454 additions and 66 deletions
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@ -260,6 +260,59 @@ absolutize(wchar_t *path)
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wcscpy(path, buffer);
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}
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/* search for a prefix value in an environment file. If found, copy it
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to the provided buffer, which is expected to be no more than MAXPATHLEN
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bytes long.
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*/
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static int
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find_env_config_value(FILE * env_file, const wchar_t * key, wchar_t * value)
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{
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int result = 0; /* meaning not found */
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char buffer[MAXPATHLEN*2+1]; /* allow extra for key, '=', etc. */
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fseek(env_file, 0, SEEK_SET);
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while (!feof(env_file)) {
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char * p = fgets(buffer, MAXPATHLEN*2, env_file);
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wchar_t tmpbuffer[MAXPATHLEN*2+1];
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PyObject * decoded;
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int n;
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if (p == NULL)
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break;
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n = strlen(p);
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if (p[n - 1] != '\n') {
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/* line has overflowed - bail */
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break;
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}
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if (p[0] == '#') /* Comment - skip */
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continue;
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decoded = PyUnicode_DecodeUTF8(buffer, n, "surrogateescape");
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if (decoded != NULL) {
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Py_ssize_t k;
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wchar_t * state;
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k = PyUnicode_AsWideChar(decoded,
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tmpbuffer, MAXPATHLEN * 2);
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Py_DECREF(decoded);
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if (k >= 0) {
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wchar_t * tok = wcstok(tmpbuffer, L" \t\r\n", &state);
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if ((tok != NULL) && !wcscmp(tok, key)) {
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tok = wcstok(NULL, L" \t", &state);
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if ((tok != NULL) && !wcscmp(tok, L"=")) {
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tok = wcstok(NULL, L"\r\n", &state);
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if (tok != NULL) {
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wcsncpy(value, tok, MAXPATHLEN);
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result = 1;
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break;
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}
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}
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}
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}
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}
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}
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return result;
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}
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/* search_for_prefix requires that argv0_path be no more than MAXPATHLEN
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bytes long.
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*/
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@ -565,6 +618,39 @@ calculate_path(void)
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MAXPATHLEN bytes long.
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*/
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/* Search for an environment configuration file, first in the
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executable's directory and then in the parent directory.
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If found, open it for use when searching for prefixes.
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*/
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{
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wchar_t tmpbuffer[MAXPATHLEN+1];
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wchar_t *env_cfg = L"pyvenv.cfg";
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FILE * env_file = NULL;
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wcscpy(tmpbuffer, argv0_path);
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joinpath(tmpbuffer, env_cfg);
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env_file = _Py_wfopen(tmpbuffer, L"r");
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if (env_file == NULL) {
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errno = 0;
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reduce(tmpbuffer);
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reduce(tmpbuffer);
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joinpath(tmpbuffer, env_cfg);
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env_file = _Py_wfopen(tmpbuffer, L"r");
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if (env_file == NULL) {
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errno = 0;
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}
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}
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if (env_file != NULL) {
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/* Look for a 'home' variable and set argv0_path to it, if found */
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if (find_env_config_value(env_file, L"home", tmpbuffer)) {
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wcscpy(argv0_path, tmpbuffer);
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}
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fclose(env_file);
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env_file = NULL;
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}
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}
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if (!(pfound = search_for_prefix(argv0_path, home, _prefix))) {
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if (!Py_FrozenFlag)
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fprintf(stderr,
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