code/cache_acls.py

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