ref: e4ce6aadac9e1de8d5ea625e9680d24cabce0e1a
dir: /sys/lib/python/plat-os2emx/pwd.py/
# this module is an OS/2 oriented replacement for the pwd standard # extension module. # written by Andrew MacIntyre, April 2001. # updated July 2003, adding field accessor support # note that this implementation checks whether ":" or ";" as used as # the field separator character. Path conversions are are applied when # the database uses ":" as the field separator character. """Replacement for pwd standard extension module, intended for use on OS/2 and similar systems which don't normally have an /etc/passwd file. The standard Unix password database is an ASCII text file with 7 fields per record (line), separated by a colon: - user name (string) - password (encrypted string, or "*" or "") - user id (integer) - group id (integer) - description (usually user's name) - home directory (path to user's home directory) - shell (path to the user's login shell) (see the section 8.1 of the Python Library Reference) This implementation differs from the standard Unix implementation by allowing use of the platform's native path separator character - ';' on OS/2, DOS and MS-Windows - as the field separator in addition to the Unix standard ":". Additionally, when ":" is the separator path conversions are applied to deal with any munging of the drive letter reference. The module looks for the password database at the following locations (in order first to last): - ${ETC_PASSWD} (or %ETC_PASSWD%) - ${ETC}/passwd (or %ETC%/passwd) - ${PYTHONHOME}/Etc/passwd (or %PYTHONHOME%/Etc/passwd) Classes ------- None Functions --------- getpwuid(uid) - return the record for user-id uid as a 7-tuple getpwnam(name) - return the record for user 'name' as a 7-tuple getpwall() - return a list of 7-tuples, each tuple being one record (NOTE: the order is arbitrary) Attributes ---------- passwd_file - the path of the password database file """ import os # try and find the passwd file __passwd_path = [] if os.environ.has_key('ETC_PASSWD'): __passwd_path.append(os.environ['ETC_PASSWD']) if os.environ.has_key('ETC'): __passwd_path.append('%s/passwd' % os.environ['ETC']) if os.environ.has_key('PYTHONHOME'): __passwd_path.append('%s/Etc/passwd' % os.environ['PYTHONHOME']) passwd_file = None for __i in __passwd_path: try: __f = open(__i, 'r') __f.close() passwd_file = __i break except: pass # path conversion handlers def __nullpathconv(path): return path.replace(os.altsep, os.sep) def __unixpathconv(path): # two known drive letter variations: "x;" and "$x" if path[0] == '$': conv = path[1] + ':' + path[2:] elif path[1] == ';': conv = path[0] + ':' + path[2:] else: conv = path return conv.replace(os.altsep, os.sep) # decide what field separator we can try to use - Unix standard, with # the platform's path separator as an option. No special field conversion # handler is required when using the platform's path separator as field # separator, but are required for the home directory and shell fields when # using the standard Unix (":") field separator. __field_sep = {':': __unixpathconv} if os.pathsep: if os.pathsep != ':': __field_sep[os.pathsep] = __nullpathconv # helper routine to identify which separator character is in use def __get_field_sep(record): fs = None for c in __field_sep.keys(): # there should be 6 delimiter characters (for 7 fields) if record.count(c) == 6: fs = c break if fs: return fs else: raise KeyError, '>> passwd database fields not delimited <<' # class to match the new record field name accessors. # the resulting object is intended to behave like a read-only tuple, # with each member also accessible by a field name. class Passwd: def __init__(self, name, passwd, uid, gid, gecos, dir, shell): self.__dict__['pw_name'] = name self.__dict__['pw_passwd'] = passwd self.__dict__['pw_uid'] = uid self.__dict__['pw_gid'] = gid self.__dict__['pw_gecos'] = gecos self.__dict__['pw_dir'] = dir self.__dict__['pw_shell'] = shell self.__dict__['_record'] = (self.pw_name, self.pw_passwd, self.pw_uid, self.pw_gid, self.pw_gecos, self.pw_dir, self.pw_shell) def __len__(self): return 7 def __getitem__(self, key): return self._record[key] def __setattr__(self, name, value): raise AttributeError('attribute read-only: %s' % name) def __repr__(self): return str(self._record) def __cmp__(self, other): this = str(self._record) if this == other: return 0 elif this < other: return -1 else: return 1 # read the whole file, parsing each entry into tuple form # with dictionaries to speed recall by UID or passwd name def __read_passwd_file(): if passwd_file: passwd = open(passwd_file, 'r') else: raise KeyError, '>> no password database <<' uidx = {} namx = {} sep = None while 1: entry = passwd.readline().strip() if len(entry) > 6: if sep == None: sep = __get_field_sep(entry) fields = entry.split(sep) for i in (2, 3): fields[i] = int(fields[i]) for i in (5, 6): fields[i] = __field_sep[sep](fields[i]) record = Passwd(*fields) if not uidx.has_key(fields[2]): uidx[fields[2]] = record if not namx.has_key(fields[0]): namx[fields[0]] = record elif len(entry) > 0: pass # skip empty or malformed records else: break passwd.close() if len(uidx) == 0: raise KeyError return (uidx, namx) # return the passwd database entry by UID def getpwuid(uid): u, n = __read_passwd_file() return u[uid] # return the passwd database entry by passwd name def getpwnam(name): u, n = __read_passwd_file() return n[name] # return all the passwd database entries def getpwall(): u, n = __read_passwd_file() return n.values() # test harness if __name__ == '__main__': getpwall()