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c16c257145
freeipa/ipaserver/install/bindinstance.py
Petr Viktorin c16c257145 Fix NS records in installation 
Our installation added two final dots to the NS records,
so the records were invalid, Bind ignored the entire zone,
and name resolution didn't work.

Fix this error and add a check for empty DNS labels to the validator
2012-09-27 16:01:22 +02:00

766 lines
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Python
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# Authors: Simo Sorce <ssorce@redhat.com>
#
# Copyright (C) 2007 Red Hat
# see file 'COPYING' for use and warranty information
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
import tempfile
import os
import pwd
import netaddr
import re
import installutils
import ldap
import service
from ipaserver import ipaldap
from ipaserver.install.dsinstance import realm_to_serverid
from ipaserver.install.installutils import resolve_host
from ipapython import sysrestore
from ipapython import ipautil
from ipalib.parameters import IA5Str
from ipalib.util import (validate_zonemgr, normalize_zonemgr,
get_dns_forward_zone_update_policy, get_dns_reverse_zone_update_policy,
normalize_zone, get_reverse_zone_default, zone_is_reverse)
from ipapython.ipa_log_manager import *
from ipalib.text import _
import ipalib
from ipalib import api, util, errors
from ipapython.dn import DN
NAMED_CONF = '/etc/named.conf'
RESOLV_CONF = '/etc/resolv.conf'
named_conf_ipa_re = re.compile(r'(?P<indent>\s*)arg\s+"(?P<name>\S+)\s(?P<value>[^"]+)";')
named_conf_ipa_template = "%(indent)sarg \"%(name)s %(value)s\";\n"
def check_inst(unattended):
has_bind = True
# So far this file is always present in both RHEL5 and Fedora if all the necessary
# bind packages are installed (RHEL5 requires also the pkg: caching-nameserver)
if not os.path.exists('/etc/named.rfc1912.zones'):
print "BIND was not found on this system"
print "Please install the 'bind' package and start the installation again"
has_bind = False
# Also check for the LDAP BIND plug-in
if not os.path.exists('/usr/lib/bind/ldap.so') and \
not os.path.exists('/usr/lib64/bind/ldap.so'):
print "The BIND LDAP plug-in was not found on this system"
print "Please install the 'bind-dyndb-ldap' package and start the installation again"
has_bind = False
if not has_bind:
return False
if not unattended and os.path.exists(NAMED_CONF):
msg = "Existing BIND configuration detected, overwrite?"
return ipautil.user_input(msg, False)
return True
def create_reverse():
return ipautil.user_input("Do you want to configure the reverse zone?", True)
def named_conf_exists():
try:
named_fd = open(NAMED_CONF, 'r')
except IOError:
return False
lines = named_fd.readlines()
named_fd.close()
for line in lines:
if line.startswith('dynamic-db "ipa"'):
return True
return False
def named_conf_get_directive(name):
"""Get a configuration option in bind-dyndb-ldap section of named.conf"""
with open(NAMED_CONF, 'r') as f:
ipa_section = False
for line in f:
if line.startswith('dynamic-db "ipa"'):
ipa_section = True
continue
if line.startswith('};'):
if ipa_section:
break
if ipa_section:
match = named_conf_ipa_re.match(line)
if match and name == match.group('name'):
return match.group('value')
def named_conf_set_directive(name, value):
"""
Set configuration option in bind-dyndb-ldap section of named.conf.
When the configuration option with given name does not exist, it
is added at the end of ipa section in named.conf.
If the value is set to None, the configuration option is removed
from named.conf.
"""
new_lines = []
with open(NAMED_CONF, 'r') as f:
ipa_section = False
matched = False
last_indent = "\t"
for line in f:
if line.startswith('dynamic-db "ipa"'):
ipa_section = True
if line.startswith('};'):
if ipa_section and not matched:
# create a new conf
new_conf = named_conf_ipa_template \
% dict(indent=last_indent,
name=name,
value=value)
new_lines.append(new_conf)
ipa_section = False
if ipa_section and not matched:
match = named_conf_ipa_re.match(line)
if match:
last_indent = match.group('indent')
if name == match.group('name'):
matched = True
if value is not None:
if not isinstance(value, basestring):
value = str(value)
new_conf = named_conf_ipa_template \
% dict(indent=last_indent,
name=name,
value=value)
new_lines.append(new_conf)
continue
new_lines.append(line)
# write new configuration
with open(NAMED_CONF, 'w') as f:
f.write("".join(new_lines))
def dns_container_exists(fqdn, suffix, dm_password=None, ldapi=False, realm=None):
"""
Test whether the dns container exists.
"""
def object_exists(dn): # FIXME, this should be a IPAdmin/ldap2 method so it can be shared
"""
Test whether the given object exists in LDAP.
"""
assert isinstance(dn, DN)
try:
conn.search_ext_s(dn, ldap.SCOPE_BASE)
except ldap.NO_SUCH_OBJECT:
return False
else:
return True
assert isinstance(suffix, DN)
try:
# At install time we may need to use LDAPI to avoid chicken/egg
# issues with SSL certs and truting CAs
if ldapi:
conn = ipaldap.IPAdmin(host=fqdn, ldapi=True, realm=realm)
else:
conn = ipaldap.IPAdmin(host=fqdn, port=636, cacert=service.CACERT)
if dm_password:
conn.do_simple_bind(bindpw=dm_password)
else:
conn.do_sasl_gssapi_bind()
except ldap.SERVER_DOWN:
raise RuntimeError('LDAP server on %s is not responding. Is IPA installed?' % fqdn)
ret = object_exists(DN(('cn', 'dns'), suffix))
conn.unbind_s()
return ret
def dns_zone_exists(name):
try:
zone = api.Command.dnszone_show(unicode(name))
except ipalib.errors.NotFound:
return False
if len(zone) == 0:
return False
else:
return True
def get_reverse_record_name(zone, ip_address):
ip = netaddr.IPAddress(ip_address)
rev = '.' + normalize_zone(zone)
fullrev = '.' + normalize_zone(ip.reverse_dns)
if not fullrev.endswith(rev):
raise ValueError("IP address does not match reverse zone")
return fullrev[1:-len(rev)]
def verify_reverse_zone(zone, ip_address):
try:
get_reverse_record_name(zone, ip_address)
except ValueError:
print "Invalid reverse zone %s" % zone
return False
return True
def find_reverse_zone(ip_address):
ip = netaddr.IPAddress(ip_address)
zone = normalize_zone(ip.reverse_dns)
while len(zone) > 0:
if dns_zone_exists(zone):
return zone
foo, bar, zone = zone.partition('.')
return None
def get_reverse_zone(ip_address):
return find_reverse_zone(ip_address) or get_reverse_zone_default(ip_address)
def read_reverse_zone(default, ip_address):
while True:
zone = ipautil.user_input("Please specify the reverse zone name", default=default)
if not zone:
return None
if verify_reverse_zone(zone, ip_address):
break
return normalize_zone(zone)
def add_zone(name, zonemgr=None, dns_backup=None, ns_hostname=None, ns_ip_address=None,
update_policy=None):
if zone_is_reverse(name):
# always normalize reverse zones
name = normalize_zone(name)
if update_policy is None:
if zone_is_reverse(name):
update_policy = get_dns_reverse_zone_update_policy(api.env.realm, name)
else:
update_policy = get_dns_forward_zone_update_policy(api.env.realm)
if zonemgr is None:
zonemgr = 'hostmaster.%s' % name
if ns_hostname is None:
# automatically retrieve list of DNS masters
dns_masters = api.Object.dnsrecord.get_dns_masters()
if not dns_masters:
raise installutils.ScriptError(
"No IPA server with DNS support found!")
ns_main = dns_masters.pop(0)
ns_replicas = dns_masters
addresses = resolve_host(ns_main)
if len(addresses) > 0:
# use the first address
ns_ip_address = addresses[0]
else:
ns_ip_address = None
else:
ns_main = ns_hostname
ns_replicas = []
ns_main = normalize_zone(ns_main)
if ns_ip_address is not None:
ns_ip_address = unicode(ns_ip_address)
try:
api.Command.dnszone_add(unicode(name),
idnssoamname=unicode(ns_main),
idnssoarname=unicode(zonemgr),
ip_address=ns_ip_address,
idnsallowdynupdate=True,
idnsupdatepolicy=unicode(update_policy),
idnsallowquery=u'any',
idnsallowtransfer=u'none',)
except (errors.DuplicateEntry, errors.EmptyModlist):
pass
nameservers = ns_replicas + [ns_main]
for hostname in nameservers:
add_ns_rr(name, hostname, dns_backup=None, force=True)
def add_rr(zone, name, type, rdata, dns_backup=None, **kwargs):
addkw = { '%srecord' % str(type.lower()) : unicode(rdata) }
addkw.update(kwargs)
try:
api.Command.dnsrecord_add(unicode(zone), unicode(name), **addkw)
except (errors.DuplicateEntry, errors.EmptyModlist):
pass
if dns_backup:
dns_backup.add(zone, type, name, rdata)
def add_fwd_rr(zone, host, ip_address):
addr = netaddr.IPAddress(ip_address)
if addr.version == 4:
add_rr(zone, host, "A", ip_address)
elif addr.version == 6:
add_rr(zone, host, "AAAA", ip_address)
def add_ptr_rr(zone, ip_address, fqdn, dns_backup=None):
name = get_reverse_record_name(zone, ip_address)
add_rr(zone, name, "PTR", fqdn+".", dns_backup)
def add_ns_rr(zone, hostname, dns_backup=None, force=True):
if not hostname.endswith('.'):
hostname += '.'
add_rr(zone, "@", "NS", hostname, dns_backup=dns_backup,
force=force)
def del_rr(zone, name, type, rdata):
delkw = { '%srecord' % str(type.lower()) : unicode(rdata) }
try:
api.Command.dnsrecord_del(unicode(zone), unicode(name), **delkw)
except (errors.NotFound, errors.EmptyModlist):
pass
def get_rr(zone, name, type):
rectype = '%srecord' % unicode(type.lower())
ret = api.Command.dnsrecord_find(unicode(zone), unicode(name))
if ret['count'] > 0:
for r in ret['result']:
if rectype in r:
return r[rectype]
return []
def zonemgr_callback(option, opt_str, value, parser):
"""
Properly validate and convert --zonemgr Option to IA5String
"""
# validate the value first
try:
validate_zonemgr(value)
except ValueError, e:
parser.error("invalid zonemgr: " + unicode(e))
parser.values.zonemgr = value
class DnsBackup(object):
def __init__(self, service):
self.service = service
self.zones = {}
def add(self, zone, record_type, host, rdata):
"""
Backup a DNS record in the file store so it can later be removed.
"""
if zone not in self.zones:
zone_id = len(self.zones)
self.zones[zone] = (zone_id, 0)
self.service.backup_state("dns_zone_%s" % zone_id, zone)
(zone_id, record_id) = self.zones[zone]
self.service.backup_state("dns_record_%s_%s" % (zone_id, record_id),
"%s %s %s" % (record_type, host, rdata))
self.zones[zone] = (zone_id, record_id + 1)
def clear_records(self, have_ldap):
"""
Remove all records from the file store. If we are connected to
ldap, we will also remove them there.
"""
i = 0
while True:
zone = self.service.restore_state("dns_zone_%s" % i)
if not zone:
return
j = 0
while True:
dns_record = self.service.restore_state("dns_record_%s_%s" % (i, j))
if not dns_record:
break
if have_ldap:
type, host, rdata = dns_record.split(" ", 2)
try:
delkw = { '%srecord' % str(type.lower()) : unicode(rdata) }
api.Command.dnsrecord_del(unicode(zone), unicode(host), **delkw)
except:
pass
j += 1
i += 1
class BindInstance(service.Service):
def __init__(self, fstore=None, dm_password=None):
service.Service.__init__(self, "named", dm_password=dm_password, ldapi=False, autobind=service.DISABLED)
self.dns_backup = DnsBackup(self)
self.named_user = None
self.domain = None
self.host = None
self.ip_address = None
self.realm = None
self.forwarders = None
self.sub_dict = None
self.reverse_zone = None
self.dm_password = dm_password
if fstore:
self.fstore = fstore
else:
self.fstore = sysrestore.FileStore('/var/lib/ipa/sysrestore')
suffix = ipautil.dn_attribute_property('_suffix')
def setup(self, fqdn, ip_address, realm_name, domain_name, forwarders, ntp,
reverse_zone, named_user="named", zonemgr=None,
zone_refresh=0, persistent_search=True, serial_autoincrement=True):
self.named_user = named_user
self.fqdn = fqdn
self.ip_address = ip_address
self.realm = realm_name
self.domain = domain_name
self.forwarders = forwarders
self.host = fqdn.split(".")[0]
self.suffix = ipautil.realm_to_suffix(self.realm)
self.ntp = ntp
self.reverse_zone = reverse_zone
self.zone_refresh = zone_refresh
self.persistent_search = persistent_search
self.serial_autoincrement = serial_autoincrement
if not zonemgr:
self.zonemgr = 'hostmaster.%s' % self.domain
else:
self.zonemgr = normalize_zonemgr(zonemgr)
self.__setup_sub_dict()
@property
def host_domain(self):
return '.'.join(self.fqdn.split(".")[1:])
@property
def host_in_rr(self):
# when a host is not in a default domain, it needs to be referred
# with FQDN and not in a domain-relative host name
if not self.host_in_default_domain():
return normalize_zone(self.fqdn)
return self.host
def host_in_default_domain(self):
return normalize_zone(self.host_domain) == normalize_zone(self.domain)
def create_sample_bind_zone(self):
bind_txt = ipautil.template_file(ipautil.SHARE_DIR + "bind.zone.db.template", self.sub_dict)
[bind_fd, bind_name] = tempfile.mkstemp(".db","sample.zone.")
os.write(bind_fd, bind_txt)
os.close(bind_fd)
print "Sample zone file for bind has been created in "+bind_name
def create_instance(self):
try:
self.stop()
except:
pass
# get a connection to the DS
self.ldap_connect()
if installutils.record_in_hosts(self.ip_address, self.fqdn) is None:
installutils.add_record_to_hosts(self.ip_address, self.fqdn)
if not dns_container_exists(self.fqdn, self.suffix, realm=self.realm,
ldapi=True, dm_password=self.dm_password):
self.step("adding DNS container", self.__setup_dns_container)
if dns_zone_exists(self.domain):
self.step("adding NS record to the zone", self.__add_self_ns)
else:
self.step("setting up our zone", self.__setup_zone)
if self.reverse_zone is not None:
self.step("setting up reverse zone", self.__setup_reverse_zone)
self.step("setting up our own record", self.__add_self)
self.step("setting up kerberos principal", self.__setup_principal)
self.step("setting up named.conf", self.__setup_named_conf)
self.step("restarting named", self.__start)
self.step("configuring named to start on boot", self.__enable)
self.step("changing resolv.conf to point to ourselves", self.__setup_resolv_conf)
self.start_creation("Configuring named:")
def __start(self):
try:
self.backup_state("running", self.is_running())
self.restart()
except:
print "named service failed to start"
def __enable(self):
self.backup_state("enabled", self.is_running())
# We do not let the system start IPA components on its own,
# Instead we reply on the IPA init script to start only enabled
# components as found in our LDAP configuration tree
try:
self.ldap_enable('DNS', self.fqdn, self.dm_password, self.suffix)
except errors.DuplicateEntry:
# service already exists (forced DNS reinstall)
# don't crash, just report error
root_logger.error("DNS service already exists")
def __setup_sub_dict(self):
if self.forwarders:
fwds = "\n"
for forwarder in self.forwarders:
fwds += "\t\t%s;\n" % forwarder
fwds += "\t"
else:
fwds = " "
if self.ntp:
optional_ntp = "\n;ntp server\n"
optional_ntp += "_ntp._udp\t\tIN SRV 0 100 123\t%s" % self.host_in_rr
else:
optional_ntp = ""
boolean_var = {}
for var in ('persistent_search', 'serial_autoincrement'):
boolean_var[var] = "yes" if getattr(self, var, False) else "no"
self.sub_dict = dict(FQDN=self.fqdn,
IP=self.ip_address,
DOMAIN=self.domain,
HOST=self.host,
REALM=self.realm,
SERVER_ID=realm_to_serverid(self.realm),
FORWARDERS=fwds,
SUFFIX=self.suffix,
OPTIONAL_NTP=optional_ntp,
ZONEMGR=self.zonemgr,
ZONE_REFRESH=self.zone_refresh,
PERSISTENT_SEARCH=boolean_var['persistent_search'],
SERIAL_AUTOINCREMENT=boolean_var['serial_autoincrement'],)
def __setup_dns_container(self):
self._ldap_mod("dns.ldif", self.sub_dict)
def __setup_zone(self):
if not self.host_in_default_domain():
# add DNS domain for host first
root_logger.debug("Host domain (%s) is different from DNS domain (%s)!" \
% (self.host_domain, self.domain))
root_logger.debug("Add DNS zone for host first.")
add_zone(self.host_domain, self.zonemgr, dns_backup=self.dns_backup,
ns_hostname=api.env.host, ns_ip_address=self.ip_address)
add_zone(self.domain, self.zonemgr, dns_backup=self.dns_backup,
ns_hostname=api.env.host, ns_ip_address=self.ip_address)
def __add_self_ns(self):
add_ns_rr(self.domain, api.env.host, self.dns_backup, force=True)
def __add_self(self):
zone = self.domain
resource_records = (
("_ldap._tcp", "SRV", "0 100 389 %s" % self.host_in_rr),
("_kerberos", "TXT", self.realm),
("_kerberos._tcp", "SRV", "0 100 88 %s" % self.host_in_rr),
("_kerberos._udp", "SRV", "0 100 88 %s" % self.host_in_rr),
("_kerberos-master._tcp", "SRV", "0 100 88 %s" % self.host_in_rr),
("_kerberos-master._udp", "SRV", "0 100 88 %s" % self.host_in_rr),
("_kpasswd._tcp", "SRV", "0 100 464 %s" % self.host_in_rr),
("_kpasswd._udp", "SRV", "0 100 464 %s" % self.host_in_rr),
)
for (host, type, rdata) in resource_records:
if type == "SRV":
add_rr(zone, host, type, rdata, self.dns_backup)
else:
add_rr(zone, host, type, rdata)
if self.ntp:
add_rr(zone, "_ntp._udp", "SRV", "0 100 123 %s" % self.host_in_rr)
# Add forward and reverse records to self
add_fwd_rr(self.host_domain, self.host, self.ip_address)
if self.reverse_zone is not None and dns_zone_exists(self.reverse_zone):
add_ptr_rr(self.reverse_zone, self.ip_address, self.fqdn)
def __setup_reverse_zone(self):
add_zone(self.reverse_zone, self.zonemgr, ns_hostname=api.env.host,
ns_ip_address=self.ip_address, dns_backup=self.dns_backup)
def __setup_principal(self):
dns_principal = "DNS/" + self.fqdn + "@" + self.realm
installutils.kadmin_addprinc(dns_principal)
# Store the keytab on disk
self.fstore.backup_file("/etc/named.keytab")
installutils.create_keytab("/etc/named.keytab", dns_principal)
p = self.move_service(dns_principal)
if p is None:
# the service has already been moved, perhaps we're doing a DNS reinstall
dns_principal = DN(('krbprincipalname', dns_principal),
('cn', 'services'), ('cn', 'accounts'), self.suffix)
else:
dns_principal = p
# Make sure access is strictly reserved to the named user
pent = pwd.getpwnam(self.named_user)
os.chown("/etc/named.keytab", pent.pw_uid, pent.pw_gid)
os.chmod("/etc/named.keytab", 0400)
# modify the principal so that it is marked as an ipa service so that
# it can host the memberof attribute, then also add it to the
# dnsserver role group, this way the DNS is allowed to perform
# DNS Updates
dns_group = DN(('cn', 'DNS Servers'), ('cn', 'privileges'), ('cn', 'pbac'), self.suffix)
mod = [(ldap.MOD_ADD, 'member', dns_principal)]
try:
self.admin_conn.modify_s(dns_group, mod)
except ldap.TYPE_OR_VALUE_EXISTS:
pass
except Exception, e:
root_logger.critical("Could not modify principal's %s entry: %s" \
% (dns_principal, str(e)))
raise
# bind-dyndb-ldap persistent search feature requires both size and time
# limit-free connection
mod = [(ldap.MOD_REPLACE, 'nsTimeLimit', '-1'),
(ldap.MOD_REPLACE, 'nsSizeLimit', '-1'),
(ldap.MOD_REPLACE, 'nsIdleTimeout', '-1'),
(ldap.MOD_REPLACE, 'nsLookThroughLimit', '-1')]
try:
self.admin_conn.modify_s(dns_principal, mod)
except Exception, e:
root_logger.critical("Could not set principal's %s LDAP limits: %s" \
% (dns_principal, str(e)))
raise
def __setup_named_conf(self):
self.fstore.backup_file(NAMED_CONF)
named_txt = ipautil.template_file(ipautil.SHARE_DIR + "bind.named.conf.template", self.sub_dict)
named_fd = open(NAMED_CONF, 'w')
named_fd.seek(0)
named_fd.truncate(0)
named_fd.write(named_txt)
named_fd.close()
def __setup_resolv_conf(self):
self.fstore.backup_file(RESOLV_CONF)
resolv_txt = "search "+self.domain+"\nnameserver "+self.ip_address+"\n"
resolv_fd = open(RESOLV_CONF, 'w')
resolv_fd.seek(0)
resolv_fd.truncate(0)
resolv_fd.write(resolv_txt)
resolv_fd.close()
def add_master_dns_records(self, fqdn, ip_address, realm_name, domain_name,
reverse_zone, ntp=False):
self.fqdn = fqdn
self.ip_address = ip_address
self.realm = realm_name
self.domain = domain_name
self.host = fqdn.split(".")[0]
self.suffix = ipautil.realm_to_suffix(self.realm)
self.ntp = ntp
self.reverse_zone = reverse_zone
self.__add_self()
def remove_master_dns_records(self, fqdn, realm_name, domain_name):
host = fqdn.split(".")[0]
suffix = ipautil.realm_to_suffix(realm_name)
zone = domain_name
resource_records = (
("_ldap._tcp", "SRV", "0 100 389 %s" % host),
("_kerberos._tcp", "SRV", "0 100 88 %s" % host),
("_kerberos._udp", "SRV", "0 100 88 %s" % host),
("_kerberos-master._tcp", "SRV", "0 100 88 %s" % host),
("_kerberos-master._udp", "SRV", "0 100 88 %s" % host),
("_kpasswd._tcp", "SRV", "0 100 464 %s" % host),
("_kpasswd._udp", "SRV", "0 100 464 %s" % host),
("_ntp._udp", "SRV", "0 100 123 %s" % host),
("@", "NS", fqdn+"."),
)
for (record, type, rdata) in resource_records:
del_rr(zone, record, type, rdata)
areclist = [("A", x) for x in get_rr(zone, host, "A")] + [("AAAA", x) for x in get_rr(zone, host, "AAAA")]
for (type, rdata) in areclist:
del_rr(zone, host, type, rdata)
rzone = find_reverse_zone(rdata)
if rzone is not None:
record = get_reverse_record_name(rzone, rdata)
del_rr(rzone, record, "PTR", fqdn+".")
# remove also master NS record from the reverse zone
del_rr(rzone, "@", "NS", fqdn+".")
def check_global_configuration(self):
"""
Check global DNS configuration in LDAP server and inform user when it
set and thus overrides his configured options in named.conf.
"""
result = api.Command.dnsconfig_show()
global_conf_set = any(param in result['result'] for \
param in api.Object['dnsconfig'].params)
if not global_conf_set:
print "Global DNS configuration in LDAP server is empty"
print "You can use 'dnsconfig-mod' command to set global DNS options that"
print "would override settings in local named.conf files"
return
print "Global DNS configuration in LDAP server is not empty"
print "The following configuration options override local settings in named.conf:"
print ""
textui = ipalib.cli.textui()
api.Command.dnsconfig_show.output_for_cli(textui, result, None, reverse=False)
def uninstall(self):
if self.is_configured():
self.print_msg("Unconfiguring %s" % self.service_name)
running = self.restore_state("running")
enabled = self.restore_state("enabled")
self.dns_backup.clear_records(api.Backend.ldap2.isconnected())
if not running is None:
self.stop()
for f in [NAMED_CONF, RESOLV_CONF]:
try:
self.fstore.restore_file(f)
except ValueError, error:
root_logger.debug(error)
pass
if not enabled is None and not enabled:
self.disable()
if not running is None and running:
self.start()
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