# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
 # file Copyright.txt or https://cmake.org/licensing for details.
 
 #[=======================================================================[.rst:
 FindSYSTEMD
 -------
 
 Finds the SYSTEMD library.
 
 Imported Targets
 ^^^^^^^^^^^^^^^^
 
 This module provides the following imported targets, if found:
 
 ``SYSTEMD::systemd``
   The SYSTEMD library
 
 Result Variables
 ^^^^^^^^^^^^^^^^
 
 This will define the following variables:
 
 ``SYSTEMD_FOUND``
   True if the system has the SYSTEMD library.
 ``SYSTEMD_VERSION``
   The version of the SYSTEMD library which was found.
 ``SYSTEMD_INCLUDE_DIRS``
   Include directories needed to use SYSTEMD.
 ``SYSTEMD_LIBRARIES``
   Libraries needed to link to SYSTEMD.
 
 ``SYSTEMD_PROGRAM_FOUND``
   True if library and headers were found
 ``SYSTEMD_UNIT_DIR``
   Include directories
 
 Cache Variables
 ^^^^^^^^^^^^^^^
 
 The following cache variables may also be set:
 
 ``SYSTEMD_INCLUDE_DIR``
   The directory containing ``foo.h``.
 ``SYSTEMD_LIBRARY``
   The path to the SYSTEMD library.
 
 #]=======================================================================]
 
 #
 # First, We'll check for libsystemd and define a target.
 #
 find_package(PkgConfig QUIET)
 pkg_check_modules(PC_SYSTEMD QUIET libsystemd)
 
 if (NOT PC_SYSTEMD_FOUND)
     # libsystemd not found. What about libsystemd-DAEMON?
     pkg_check_modules(PC_SYSTEMD QUIET libsystemd-daemon)
     if (PC_SYSTEMD_FOUND)
         message(STATUS "libsystemd-daemon found")
     else()
         message(STATUS "libsystemd-daemon not found")
     endif()
 endif()
 
 find_path(SYSTEMD_INCLUDE_DIR
     NAMES systemd/sd-bus.h
     PATHS ${PC_SYSTEMD_INCLUDE_DIRS}
     PATH_SUFFIXES systemd
 )
 find_library(SYSTEMD_LIBRARY
     NAMES systemd
     PATHS ${PC_SYSTEMD_LIBRARY_DIRS}
 )
 
 set(SYSTEMD_VERSION ${PC_SYSTEMD_VERSION})
 
 include(FindPackageHandleStandardArgs)
 find_package_handle_standard_args(SYSTEMD
     FOUND_VAR SYSTEMD_FOUND
     REQUIRED_VARS
         SYSTEMD_LIBRARY
         SYSTEMD_INCLUDE_DIR
     VERSION_VAR SYSTEMD_VERSION
 )
 
 if(SYSTEMD_FOUND)
     set(SYSTEMD_LIBRARIES ${SYSTEMD_LIBRARY})
     set(SYSTEMD_INCLUDE_DIRS ${SYSTEMD_INCLUDE_DIR})
     set(SYSTEMD_DEFINITIONS ${PC_SYSTEMD_CFLAGS_OTHER})
 
     if(NOT TARGET SYSTEMD::systemd)
         add_library(SYSTEMD::systemd UNKNOWN IMPORTED)
         set_target_properties(SYSTEMD::systemd PROPERTIES
             IMPORTED_LOCATION "${SYSTEMD_LIBRARY}"
             INTERFACE_COMPILE_OPTIONS "${PC_SYSTEMD_CFLAGS_OTHER}"
             INTERFACE_INCLUDE_DIRECTORIES "${SYSTEMD_INCLUDE_DIR}"
         )
     endif()
 endif()
 
 mark_as_advanced(
     SYSTEMD_INCLUDE_DIR
     SYSTEMD_LIBRARY
 )
 
 #
 # Next, We'll check for plain ol' systemd application, needed if we want to install the service unit files
 #
 pkg_check_modules(SYSTEMD_PROGRAM QUIET systemd)
 
 if (SYSTEMD_PROGRAM_FOUND)
     if ("${SYSTEMD_UNIT_DIR}" STREQUAL "")
         # Use pkg-config to look up the systemd unit install directory
         execute_process(COMMAND ${PKG_CONFIG_EXECUTABLE}
             --variable=systemdsystemunitdir systemd
             OUTPUT_VARIABLE SYSTEMD_UNIT_DIR)
         string(REGEX REPLACE "[ \t\n]+" "" SYSTEMD_UNIT_DIR "${SYSTEMD_UNIT_DIR}")
     endif()
 
     message(STATUS "systemd services install dir: ${SYSTEMD_UNIT_DIR}")
 else()
     if (SYSTEMD_UNIT_DIR)
         message (FATAL_ERROR "SYSTEMD_UNIT_DIR was defined but pkg-config was not able to find systemd!")
     endif()
 endif()