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authorBrian Kearns <bdkearns@gmail.com>2013-03-03 19:11:13 -0500
committerBrian Kearns <bdkearns@gmail.com>2013-03-03 19:11:13 -0500
commitd776c009d6430a0f06807538ce88f13b0cfd60ac (patch)
tree80fcb3174fd321a11541502f3f647dcaf1a7d0dd /lib-python/3/plat-os2emx/pwd.py
parentforgot this (diff)
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hg mv lib-python/3.2 lib-python/3
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+# 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)
+ - ${PYTHONHOME}/Etc/passwd (or %PYTHONHOME%/Etc/passwd)
+
+Classes
+-------
+
+None
+
+Functions
+---------
+
+getpwuid(uid) - return the record for user-id uid as a 7-tuple
+
+getpwnam(name) - return the record for user 'name' as a 7-tuple
+
+getpwall() - return a list of 7-tuples, each tuple being one record
+ (NOTE: the order is arbitrary)
+
+Attributes
+----------
+
+passwd_file - the path of the password database file
+
+"""
+
+import os
+
+# try and find the passwd file
+__passwd_path = []
+if 'ETC_PASSWD' in os.environ:
+ __passwd_path.append(os.environ['ETC_PASSWD'])
+if 'ETC' in os.environ:
+ __passwd_path.append('%s/passwd' % os.environ['ETC'])
+if 'PYTHONHOME' in os.environ:
+ __passwd_path.append('%s/Etc/passwd' % os.environ['PYTHONHOME'])
+
+passwd_file = None
+for __i in __passwd_path:
+ try:
+ __f = open(__i, 'r')
+ __f.close()
+ passwd_file = __i
+ break
+ except:
+ pass
+
+# path conversion handlers
+def __nullpathconv(path):
+ return path.replace(os.altsep, os.sep)
+
+def __unixpathconv(path):
+ # two known drive letter variations: "x;" and "$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 True:
+ entry = passwd.readline().strip()
+ if len(entry) > 6:
+ if sep is 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 fields[2] not in uidx:
+ uidx[fields[2]] = record
+ if fields[0] not in namx:
+ 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()