Thanks!! This was very helpful. It worked perfectly. I had no clue about the intricacies of how python represents the group data from the underlying OS.
This page doesn't go into to detailed explanation like you did: http://docs.python.org/2/library/grp.html On Wednesday, December 19, 2012 6:17:16 PM UTC-5, Hans Mulder wrote: > On 19/12/12 22:40:00, saqib.ali...@gmail.com wrote: > > > > > > > > > I'm using python 2.6.4 on Solaris 5-10. > > > > > > I have a file named "myFile". It is owned by someone else, by > > > I ("myuser") am in the file's group ("mygrp"). Below is my python > > > code. Why does it tell me that mygrp has no members??? > > > > > > > > >>>> import os, pwd, grp > > >>>> stat_info = os.stat("myFile") > > >>>> fileUID = stat_info.st_uid > > >>>> fileGID = stat_info.st_gid > > >>>> fileGroup = grp.getgrgid(fileGID)[0] > > >>>> fileUser = pwd.getpwuid(fileUID)[0] > > >>>> print "grp.getgrgid(fileGID) = %s" % grp.getgrgid(fileGID) > > > > > > grp.getgrgid(fileGID) = grp.struct_group(gr_name='mygrp', gr_passwd='', > > gr_gid=100, gr_mem=[]) > > > > It doesn't say that your group has no members. > > > > Every account has a primary group, and some accounts also > > have addtional groups. The primary group is the one in the > > .pw_gid attribute in the pwd entry. The additional groups > > are those that mention the account in the .gr_mem attribute > > in their grp entry. > > > > Your experiment shows that nobody has "mygrp" as an additional > > group. So if you're a member of mygrp, then it must be your > > primary group, i.e. os.getgid() should return 100 for you. > > > > You can get a complete list of members of group by adding > > two lists: > > > > def all_members(gid): > > primary_members = [ user.pw_name > > for user in pwd.getpwall() if user.pw_gid == gid ] > > additional_members = grp.getgrgid(gid).gr_mem > > return primary_members + additional_members > > > > > > Hope this helps, > > > > -- HansM -- http://mail.python.org/mailman/listinfo/python-list
