code/cache_acls.py

   1 #!/usr/bin/python
   2 from sipb_xen_database import *
   3 import sys
   4 import getafsgroups
   5 import subprocess
   6
   7 def expandLocker(name):
   8     groups = getafsgroups.getLockerAcl(name)
   9     cell = getafsgroups.getCell(name)
  10     ans = set()
  11     for group in groups:
  12         if ':' in group:
  13             ans.update(getafsgroups.getAfsGroupMembers(group, cell))
  14         else:
  15             ans.add(group)
  16     return ans
  17
  18 def isUser(name):
  19     p = subprocess.Popen(['vos', 'examine', 'user.'+name],
  20                          stdout=subprocess.PIPE, stderr=subprocess.PIPE)
  21     if p.wait():
  22         return False
  23     return True
  24
  25
  26 def expandName(name):
  27     if ':' not in name:
  28         if isUser(name):
  29             return [name]
  30         name = 'system:'+name
  31     try:
  32         return getafsgroups.getAfsGroupMembers(name, 'athena.mit.edu')
  33     except getafsgroups.AfsProcessError:
  34         return []
  35
  36 def accessList(m):
  37     people = set()
  38     people.update(expandLocker(m.owner))
  39     people.update(expandName(m.administrator))
  40     return people
  41
  42 def refreshMachine(m):
  43     people = accessList(m)
  44     old_people = set(a.user for a in m.acl)
  45     for removed in old_people - people:
  46         ma = [x for x in m.acl if x.user == removed][0]
  47         ctx.current.delete(ma)
  48     for p in people - old_people:
  49         ma = MachineAccess(machine_id=m.machine_id, user=p)
  50         ctx.current.save(ma)
  51
  52 def refreshCache():
  53     transaction = ctx.current.create_transaction()
  54
  55     try:
  56         machines = Machine.select()
  57         for m in machines:
  58             refreshMachine(m)
  59         ctx.current.flush()
  60
  61         # Atomically execute our changes
  62         transaction.commit()
  63     except:
  64         # Failed! Rollback all the changes.
  65         transaction.rollback()
  66         raise
  67
  68 if __name__ == '__main__':
  69     connect('postgres://sipb-xen@sipb-xen-dev/sipb_xen')
  70     refreshCache()