Split the data and sources

data/CMakeLists.txt

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+find_program(SED sed)
+
+add_custom_command(OUTPUT ${PROJECT_BINARY_DIR}/org.freedesktop.timedate1.service
+	COMMAND ${SED} -e s|@LIBEXECDIR@|${CMAKE_INSTALL_FULL_LIBEXECDIR}| ${CMAKE_CURRENT_SOURCE_DIR}/org.freedesktop.timedate1.service.in > ${PROJECT_BINARY_DIR}/org.freedesktop.timedate1.service
+	MAIN_DEPENDENCY org.freedesktop.timedate1.service.in
+	VERBATIM)
+add_custom_target(service ALL DEPENDS ${PROJECT_BINARY_DIR}/org.freedesktop.timedate1.service)
+
+install(FILES org.freedesktop.timedate1.xml
+	DESTINATION ${CMAKE_INSTALL_DATADIR}/dbus-1/interfaces)
+install(FILES org.freedesktop.timedate1.policy
+	DESTINATION ${CMAKE_INSTALL_DATADIR}/polkit-1/actions)
+install(FILES org.freedesktop.timedate1.conf
+	DESTINATION ${CMAKE_INSTALL_SYSCONFDIR}/dbus-1/system.d)
+install(FILES ${PROJECT_BINARY_DIR}/org.freedesktop.timedate1.service
+	DESTINATION ${CMAKE_INSTALL_DATADIR}/dbus-1/system-services)

data/org.freedesktop.timedate1.conf

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+<?xml version="1.0"?> <!--*-nxml-*-->
+<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
+        "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
+
+<!--
+  This file is part of systemd.
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+-->
+
+<busconfig>
+
+        <policy user="root">
+                <allow own="org.freedesktop.timedate1"/>
+                <allow send_destination="org.freedesktop.timedate1"/>
+                <allow receive_sender="org.freedesktop.timedate1"/>
+        </policy>
+
+        <policy context="default">
+                <allow send_destination="org.freedesktop.timedate1"/>
+                <allow receive_sender="org.freedesktop.timedate1"/>
+        </policy>
+
+</busconfig>

data/org.freedesktop.timedate1.policy

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE policyconfig PUBLIC "-//freedesktop//DTD PolicyKit Policy Configuration 1.0//EN" "http://www.freedesktop.org/standards/PolicyKit/1/policyconfig.dtd">
+<policyconfig>
+	<vendor>slack-timedate</vendor>
+
+	<action id="org.freedesktop.timedate1.set-time">
+		<message>Changes the system clock</message>
+		<defaults>
+			<allow_any>auth_admin_keep</allow_any>
+            <allow_inactive>auth_admin_keep</allow_inactive>
+            <allow_active>auth_admin_keep</allow_active>
+		</defaults>
+	</action>
+
+	<action id="org.freedesktop.timedate1.set-timezone">
+		<message>Sets the system timezone</message>
+		<defaults>
+			<allow_any>auth_admin_keep</allow_any>
+            <allow_inactive>auth_admin_keep</allow_inactive>
+            <allow_active>auth_admin_keep</allow_active>
+		</defaults>
+	</action>
+
+	<action id="org.freedesktop.timedate1.set-local-rtc">
+		<message>Controls whether the RTC is in local time or UTC</message>
+		<defaults>
+			<allow_any>auth_admin_keep</allow_any>
+            <allow_inactive>auth_admin_keep</allow_inactive>
+            <allow_active>auth_admin_keep</allow_active>
+		</defaults>
+	</action>
+
+	<action id="org.freedesktop.timedate1.set-ntp">
+		<message>Controls whether the system clock is synchronized with the network</message>
+		<defaults>
+			<allow_any>auth_admin_keep</allow_any>
+            <allow_inactive>auth_admin_keep</allow_inactive>
+            <allow_active>auth_admin_keep</allow_active>
+		</defaults>
+	</action>
+</policyconfig>

data/org.freedesktop.timedate1.service.in

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+[D-BUS Service]
+Name=org.freedesktop.timedate1
+Exec=@LIBEXECDIR@/slack-timedate
+User=root

data/org.freedesktop.timedate1.xml

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+<!DOCTYPE node PUBLIC "-//freedesktop//DTD D-BUS Object Introspection 1.0//EN"
+"http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd">
+<node>
+ <interface name="org.freedesktop.timedate1">
+  <property name="Timezone" type="s" access="read"/>
+  <property name="LocalRTC" type="b" access="read"/>
+  <property name="NTP" type="b" access="read"/>
+  <method name="SetTime">
+   <arg name="usec_utc" type="x" direction="in"/>
+   <arg name="relative" type="b" direction="in"/>
+   <arg name="user_interaction" type="b" direction="in"/>
+  </method>
+  <method name="SetTimezone">
+   <arg name="timezone" type="s" direction="in"/>
+   <arg name="user_interaction" type="b" direction="in"/>
+  </method>
+  <method name="SetLocalRTC">
+   <arg name="local_rtc" type="b" direction="in"/>
+   <arg name="fix_system" type="b" direction="in"/>
+   <arg name="user_interaction" type="b" direction="in"/>
+  </method>
+  <method name="SetNTP">
+   <arg name="use_ntp" type="b" direction="in"/>
+   <arg name="user_interaction" type="b" direction="in"/>
+  </method>
+ </interface>
+</node>