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Diffstat (limited to 'ipapython/platform/systemd.py')
| -rw-r--r-- | ipapython/platform/systemd.py | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/ipapython/platform/systemd.py b/ipapython/platform/systemd.py new file mode 100644 index 000000000..e9990ab38 --- /dev/null +++ b/ipapython/platform/systemd.py @@ -0,0 +1,204 @@ +# 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() |