source: package_tags/sipb-xen-www/1/code/cache_acls.py @ 2758

Last change on this file since 2758 was 263, checked in by ecprice, 16 years ago

Modularize cache_acls.py yet more

File size: 1.7 KB
Line 
1#!/usr/bin/python
2from sipb_xen_database import *
3import sys
4import getafsgroups
5import subprocess
6
7def 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
18def 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
26def expandName(name):
27    if ':' not in name:
28        if isUser(name):
29            return [name]
30        name = 'system:'+name
31    return getafsgroups.getAfsGroupMembers(name, 'athena.mit.edu')
32
33def refreshMachine(m):
34    people = set()
35    people.update(expandLocker(m.owner))
36    people.update(expandName(m.administrator))
37    old_people = set(a.user for a in m.acl)
38    for removed in old_people - people:
39        ma = [x for x in m.acl if x.user == removed][0]
40        ctx.current.delete(ma)
41    for p in people - old_people:
42        ma = MachineAccess(machine_id=m.machine_id, user=p)
43        ctx.current.save(ma)
44   
45def refreshCache():
46    transaction = ctx.current.create_transaction()
47
48    try:
49        machines = Machine.select()
50        for m in machines:
51            refreshMachine(m)
52        ctx.current.flush()
53           
54        # Atomically execute our changes
55        transaction.commit()
56    except:
57        # Failed! Rollback all the changes.
58        transaction.rollback()
59        raise
60
61if __name__ == '__main__':
62    connect('postgres://sipb-xen@sipb-xen-dev/sipb_xen')
63    refreshCache()
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