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# Author: Alexander Bokovoy <abokovoy@redhat.com>
#
# Copyright (C) 2011 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/>.
#
from ipapython import ipautil
from ipapython.platform import base
import sys, os, shutil
class SystemdService(base.PlatformService):
SYSTEMD_ETC_PATH = "/etc/systemd/system/"
SYSTEMD_LIB_PATH = "/lib/systemd/system/"
SYSTEMD_SRV_TARGET = "%s.target.wants"
def __init__(self, service_name):
super(SystemdService, self).__init__(service_name)
self.lib_path = os.path.join(self.SYSTEMD_LIB_PATH, self.service_name)
self.lib_path_exists = None
def service_instance(self, instance_name):
if self.lib_path_exists is None:
self.lib_path_exists = os.path.exists(self.lib_path)
elements = self.service_name.split("@")
# Short-cut: if there is already exact service name, return it
if self.lib_path_exists and len(instance_name) == 0:
if len(elements) == 1:
# service name is like pki-cad.target or krb5kdc.service
return self.service_name
if len(elements) > 1 and elements[1][0] != '.':
# Service name is like pki-cad@pki-ca.service and that file exists
return self.service_name
if len(elements) > 1:
# We have dynamic service
if len(instance_name) > 0:
# Instanciate dynamic service
return "%s@%s.service" % (elements[0], instance_name)
else:
# No instance name, try with target
tgt_name = "%s.target" % (elements[0])
srv_lib = os.path.join(self.SYSTEMD_LIB_PATH, tgt_name)
if os.path.exists(srv_lib):
return tgt_name
return self.service_name
def parse_variables(self, text, separator=None):
"""
Parses 'systemctl show' output and returns a dict[variable]=value
Arguments: text -- 'systemctl show' output as string
separator -- optional (defaults to None), what separates the key/value pairs in the text
"""
def splitter(x, separator=None):
if len(x) > 1:
y = x.split(separator)
return (y[0], y[-1])
return (None,None)
return dict(map(lambda x: splitter(x, separator=separator), text.split("\n")))
def stop(self, instance_name="", capture_output=True):
ipautil.run(["/bin/systemctl", "stop", self.service_instance(instance_name)], capture_output=capture_output)
def start(self, instance_name="", capture_output=True):
ipautil.run(["/bin/systemctl", "start", self.service_instance(instance_name)], capture_output=capture_output)
def restart(self, instance_name="", capture_output=True):
# Restart command is broken before systemd-36-3.fc16
# If you have older systemd version, restart of dependent services will hang systemd indefinetly
ipautil.run(["/bin/systemctl", "restart", self.service_instance(instance_name)], capture_output=capture_output)
def is_running(self, instance_name=""):
ret = True
try:
(sout, serr, rcode) = ipautil.run(["/bin/systemctl", "is-active", self.service_instance(instance_name)],capture_output=True)
if rcode != 0:
ret = False
except ipautil.CalledProcessError:
ret = False
return ret
def is_installed(self):
installed = True
try:
(sout,serr,rcode) = ipautil.run(["/bin/systemctl", "list-unit-files", "--full"])
if rcode != 0:
installed = False
else:
svar = self.parse_variables(sout)
if not self.service_instance("") in svar:
# systemd doesn't show the service
installed = False
except ipautil.CalledProcessError, e:
installed = False
return installed
def is_enabled(self, instance_name=""):
enabled = True
try:
(sout,serr,rcode) = ipautil.run(["/bin/systemctl", "is-enabled", self.service_instance(instance_name)])
if rcode != 0:
enabled = False
except ipautil.CalledProcessError, e:
enabled = False
return enabled
def enable(self, instance_name=""):
if self.lib_path_exists is None:
self.lib_path_exists = os.path.exists(self.lib_path)
elements = self.service_name.split("@")
l = len(elements)
if self.lib_path_exists and (l > 1 and elements[1][0] != '.'):
# There is explicit service unit supporting this instance, follow normal systemd enabler
self.__enable(instance_name)
return
if self.lib_path_exists and (l == 1):
# There is explicit service unit which does not support the instances, ignore instance
self.__enable()
return
if len(instance_name) > 0 and l > 1:
# New instance, we need to do following:
# 1. Copy <service>@.service to /etc/systemd/system/ if it is not there
# 2. Make /etc/systemd/system/<service>.target.wants/ if it is not there
# 3. Link /etc/systemd/system/<service>.target.wants/<service>@<instance_name>.service to
# /etc/systemd/system/<service>@.service
srv_etc = os.path.join(self.SYSTEMD_ETC_PATH, self.service_name)
srv_tgt = os.path.join(self.SYSTEMD_ETC_PATH, self.SYSTEMD_SRV_TARGET % (elements[0]))
srv_lnk = os.path.join(srv_tgt, self.service_instance(instance_name))
try:
if not ipautil.file_exists(srv_etc):
shutil.copy(self.lib_path, srv_etc)
if not ipautil.dir_exists(srv_tgt):
os.mkdir(srv_tgt)
if os.path.exists(srv_lnk):
# Remove old link
os.unlink(srv_lnk)
if not os.path.exists(srv_lnk):
# object does not exist _or_ is a broken link
if not os.path.islink(srv_lnk):
# if it truly does not exist, make a link
os.symlink(srv_etc, srv_lnk)
else:
# Link exists and it is broken, make new one
os.unlink(srv_lnk)
os.symlink(srv_etc, srv_lnk)
ipautil.run(["/bin/systemctl", "--system", "daemon-reload"])
except:
pass
else:
self.__enable(instance_name)
def disable(self, instance_name=""):
elements = self.service_name.split("@")
if instance_name != "" and len(elements) > 1:
# Remove instance, we need to do following:
# Remove link from /etc/systemd/system/<service>.target.wants/<service>@<instance_name>.service
# to /etc/systemd/system/<service>@.service
srv_tgt = os.path.join(self.SYSTEMD_ETC_PATH, self.SYSTEMD_SRV_TARGET % (elements[0]))
srv_lnk = os.path.join(srv_tgt, self.service_instance(instance_name))
try:
if ipautil.dir_exists(srv_tgt):
if os.path.islink(srv_lnk):
os.unlink(srv_lnk)
ipautil.run(["/bin/systemctl", "--system", "daemon-reload"])
except:
pass
else:
self.__disable(instance_name)
def __enable(self, instance_name=""):
try:
ipautil.run(["/bin/systemctl", "enable", self.service_instance(instance_name)])
except ipautil.CalledProcessError, e:
pass
def __disable(self, instance_name=""):
try:
ipautil.run(["/bin/systemctl", "disable", self.service_instance(instance_name)])
except ipautil.CalledProcessError, e:
pass
def install(self):
self.enable()
def remove(self):
self.disable()
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