source: trunk/packages/invirt-remote-server/files/usr/sbin/invirt-remconffs @ 1288

#!/usr/bin/python

import routefs
from routes import Mapper

from syslog import *
from time import time

from invirt import database
from invirt.config import structs as config

class RemConfFS(routefs.RouteFS):
        """
        RemConfFS creates a filesytem for configuring remctl, like this:
        /
        |-- acl
        |   |-- machine1
        |   ...
        |   `-- machinen
        `-- conf
        
        The machine list and the acls are drawn from a database.
        """
        
        def __init__(self, *args, **kw):
                """Initialize the filesystem and set it to allow_other access besides
                the user who mounts the filesystem (i.e. root)
                """
                super(RemConfFS, self).__init__(*args, **kw)
                self.lasttime = time()
                self.fuse_args.add("allow_other", True)
                
                openlog('invirt-remconffs ', LOG_PID, LOG_DAEMON)
                
                syslog(LOG_DEBUG, 'Init complete.')
        
        def make_map(self):
                m = Mapper()
                m.connect('', controller='getroot')
                m.connect('acl', controller='getmachines')
                m.connect('acl/:machine', controller='getacl')
                m.connect('conf', controller='getconf')
                return m
        
        def getroot(self, **kw):
                return ['acl', 'conf']
        
        def getacl(self, machine, **kw):
                """Build the ACL file for a machine
                """
                machine = database.Machine.query().filter_by(name=machine).one()
                users = [acl.user for acl in machine.acl]
                return "\n".join(map(self.userToPrinc, users)
                                 + ['include /etc/remctl/acl/web',
                                    ''])
        
        def getconf(self, **kw):
                """Build the master conf file, with all machines
                """
                return '\n'.join("control %s /usr/sbin/invirt-remote-proxy-control"
                                 " /etc/remctl/remconffs/acl/%s"
                                 % (machine_name, machine_name)
                                 for machine_name in self.getmachines())+'\n'
        
        def getmachines(self, **kw):
                """Get the list of VMs in the database, clearing the cache if it's 
                older than 15 seconds"""
                if time() - self.lasttime > 15:
                        self.lasttime = time()
                        database.clear_cache()
                return [machine.name for machine in database.session.query(database.Machine).all()]
        
        def userToPrinc(self, user):
                """Convert Kerberos v4-style names to v5-style and append a default
                realm if none is specified
                """
                if '@' in user:
                        (princ, realm) = user.split('@')
                else:
                        princ = user
                        realm = config.authn[0].realm
                
                return princ.replace('.', '/') + '@' + realm

if __name__ == '__main__':
        database.connect()
        routefs.main(RemConfFS)