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-# this module is an OS/2 oriented replacement for the grp 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.
-
-"""Replacement for grp standard extension module, intended for use on
-OS/2 and similar systems which don't normally have an /etc/group file.
-
-The standard Unix group database is an ASCII text file with 4 fields per
-record (line), separated by a colon:
- - group name (string)
- - group password (optional encrypted string)
- - group id (integer)
- - group members (comma delimited list of userids, with no spaces)
-
-Note that members are only included in the group file for groups that
-aren't their primary groups.
-(see the section 8.2 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 ":".
-
-The module looks for the group database at the following locations
-(in order first to last):
- - ${ETC_GROUP} (or %ETC_GROUP%)
- - ${ETC}/group (or %ETC%/group)
- - ${PYTHONHOME}/Etc/group (or %PYTHONHOME%/Etc/group)
-
-Classes
--------
-
-None
-
-Functions
----------
-
-getgrgid(gid) - return the record for group-id gid as a 4-tuple
-
-getgrnam(name) - return the record for group 'name' as a 4-tuple
-
-getgrall() - return a list of 4-tuples, each tuple being one record
- (NOTE: the order is arbitrary)
-
-Attributes
-----------
-
-group_file - the path of the group database file
-
-"""
-
-import os
-
-# try and find the group file
-__group_path = []
-if 'ETC_GROUP' in os.environ:
- __group_path.append(os.environ['ETC_GROUP'])
-if 'ETC' in os.environ:
- __group_path.append('%s/group' % os.environ['ETC'])
-if 'PYTHONHOME' in os.environ:
- __group_path.append('%s/Etc/group' % os.environ['PYTHONHOME'])
-
-group_file = None
-for __i in __group_path:
- try:
- __f = open(__i, 'r')
- __f.close()
- group_file = __i
- break
- except:
- pass
-
-# decide what field separator we can try to use - Unix standard, with
-# the platform's path separator as an option. No special field conversion
-# handlers are required for the group file.
-__field_sep = [':']
-if os.pathsep:
- if os.pathsep != ':':
- __field_sep.append(os.pathsep)
-
-# helper routine to identify which separator character is in use
-def __get_field_sep(record):
- fs = None
- for c in __field_sep:
- # there should be 3 delimiter characters (for 4 fields)
- if record.count(c) == 3:
- fs = c
- break
- if fs:
- return fs
- else:
- raise KeyError('>> group 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 Group:
- def __init__(self, name, passwd, gid, mem):
- self.__dict__['gr_name'] = name
- self.__dict__['gr_passwd'] = passwd
- self.__dict__['gr_gid'] = gid
- self.__dict__['gr_mem'] = mem
- self.__dict__['_record'] = (self.gr_name, self.gr_passwd,
- self.gr_gid, self.gr_mem)
-
- def __len__(self):
- return 4
-
- 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 GID or group name
-def __read_group_file():
- if group_file:
- group = open(group_file, 'r')
- else:
- raise KeyError('>> no group database <<')
- gidx = {}
- namx = {}
- sep = None
- while 1:
- entry = group.readline().strip()
- if len(entry) > 3:
- if sep is None:
- sep = __get_field_sep(entry)
- fields = entry.split(sep)
- fields[2] = int(fields[2])
- fields[3] = [f.strip() for f in fields[3].split(',')]
- record = Group(*fields)
- if fields[2] not in gidx:
- gidx[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
- group.close()
- if len(gidx) == 0:
- raise KeyError
- return (gidx, namx)
-
-# return the group database entry by GID
-def getgrgid(gid):
- g, n = __read_group_file()
- return g[gid]
-
-# return the group database entry by group name
-def getgrnam(name):
- g, n = __read_group_file()
- return n[name]
-
-# return all the group database entries
-def getgrall():
- g, n = __read_group_file()
- return g.values()
-
-# test harness
-if __name__ == '__main__':
- getgrall()