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Implemented PEP 405 (Python virtual environments).

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This commit is contained in:
Vinay Sajip 2012-05-26 03:45:29 +01:00
parent f2bdc3690a
commit 7ded1f0f69
41 changed files with 1454 additions and 66 deletions
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81
PC/getpathp.c
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@ -423,6 +423,53 @@ get_progpath(void)
progpath[0] = '\0';
}
static int
find_env_config_value(FILE * env_file, const wchar_t * key, wchar_t * value)
{
int result = 0; /* meaning not found */
char buffer[MAXPATHLEN*2+1]; /* allow extra for key, '=', etc. */
fseek(env_file, 0, SEEK_SET);
while (!feof(env_file)) {
char * p = fgets(buffer, MAXPATHLEN*2, env_file);
wchar_t tmpbuffer[MAXPATHLEN*2+1];
PyObject * decoded;
int n;
if (p == NULL)
break;
n = strlen(p);
if (p[n - 1] != '\n') {
/* line has overflowed - bail */
break;
}
if (p[0] == '#') /* Comment - skip */
continue;
decoded = PyUnicode_DecodeUTF8(buffer, n, "surrogateescape");
if (decoded != NULL) {
Py_ssize_t k;
k = PyUnicode_AsWideChar(decoded,
tmpbuffer, MAXPATHLEN * 2);
Py_DECREF(decoded);
if (k >= 0) {
wchar_t * tok = wcstok(tmpbuffer, L" \t\r\n");
if ((tok != NULL) && !wcscmp(tok, key)) {
tok = wcstok(NULL, L" \t");
if ((tok != NULL) && !wcscmp(tok, L"=")) {
tok = wcstok(NULL, L"\r\n");
if (tok != NULL) {
wcsncpy(value, tok, MAXPATHLEN);
result = 1;
break;
}
}
}
}
}
}
return result;
}
static void
calculate_path(void)
{
@ -457,6 +504,40 @@ calculate_path(void)
/* progpath guaranteed \0 terminated in MAXPATH+1 bytes. */
wcscpy(argv0_path, progpath);
reduce(argv0_path);
/* 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.
*/
{
wchar_t tmpbuffer[MAXPATHLEN+1];
wchar_t *env_cfg = L"pyvenv.cfg";
FILE * env_file = NULL;
wcscpy(tmpbuffer, argv0_path);
join(tmpbuffer, env_cfg);
env_file = _Py_wfopen(tmpbuffer, L"r");
if (env_file == NULL) {
errno = 0;
reduce(tmpbuffer);
reduce(tmpbuffer);
join(tmpbuffer, env_cfg);
env_file = _Py_wfopen(tmpbuffer, L"r");
if (env_file == NULL) {
errno = 0;
}
}
if (env_file != NULL) {
/* Look for a 'home' variable and set argv0_path to it, if found */
if (find_env_config_value(env_file, L"home", tmpbuffer)) {
wcscpy(argv0_path, tmpbuffer);
}
fclose(env_file);
env_file = NULL;
}
}
if (pythonhome == NULL || *pythonhome == '\0') {
if (search_for_prefix(argv0_path, LANDMARK))
pythonhome = prefix;