From 12cbf34302fd6dfd8454ead48849801298e079a7 Mon Sep 17 00:00:00 2001
From: Donald Buczek <buczek@molgen.mpg.de>
Date: Tue, 29 Oct 2019 16:33:28 +0100
Subject: [PATCH] Make install dir for unit files configurable

Currently the systemd service unit files are installed
into /lib/systemd/system if that directory exists. This
might not be optimal for every user, e.g. when the build
system is not the target system or when building as an
unprivileged user using CMAKE_INSTALL_PREFIX.

Make this configurable by adding a cached cmake variable
CMAKE_INSTALL_SYSTEMD_UNITDIR. Usage:

- install unit files into /lib/systemd/system if it exists (old
behavior)

    cmake

- don't install unit files

   cmake -D CMAKE_INSTALL_SYSTEMD_UNITDIR=

- install into absolute path

   cmake -D CMAKE_INSTALL_SYSTEMD_UNITDIR=/path

- install into path relative to ${CMAKE_INSTALL_PREFIX}

   cmake -D CMAKE_INSTALL_SYSTEMD_UNITDIR=path
---
 CMakeLists.txt               | 3 +++
 src/vpnbridge/CMakeLists.txt | 4 ++--
 src/vpnclient/CMakeLists.txt | 4 ++--
 src/vpnserver/CMakeLists.txt | 4 ++--
 4 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2ce66a3b..0491bbbb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -41,6 +41,9 @@ if(UNIX)
 
   include(CheckIncludeFile)
   Check_Include_File(sys/auxv.h HAVE_SYS_AUXV)
+  if(EXISTS "/lib/systemd/system")
+    set(CMAKE_INSTALL_SYSTEMD_UNITDIR "/lib/systemd/system" CACHE STRING "Where to install systemd unit files")
+  endif()
 endif()
 
 configure_file("${TOP_DIRECTORY}/AUTHORS.TXT" "${TOP_DIRECTORY}/src/bin/hamcore/authors.txt" COPYONLY)
diff --git a/src/vpnbridge/CMakeLists.txt b/src/vpnbridge/CMakeLists.txt
index fb076876..34dd6b4c 100644
--- a/src/vpnbridge/CMakeLists.txt
+++ b/src/vpnbridge/CMakeLists.txt
@@ -40,11 +40,11 @@ if(UNIX)
   )
 
   install_wrapper_script("vpnbridge" "${CMAKE_INSTALL_FULL_LIBEXECDIR}/softether/vpnbridge/vpnbridge")
-  if(EXISTS "/lib/systemd/system")
+  if(NOT "${CMAKE_INSTALL_SYSTEMD_UNITDIR}" STREQUAL "")
     configure_file(${TOP_DIRECTORY}/systemd/softether-vpnbridge.service ${CMAKE_BINARY_DIR}/systemd/softether-vpnbridge.service)
     install(FILES ${CMAKE_BINARY_DIR}/systemd/softether-vpnbridge.service
       COMPONENT "vpnbridge"
-      DESTINATION "/lib/systemd/system"
+      DESTINATION ${CMAKE_INSTALL_SYSTEMD_UNITDIR}
       PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
     )
   endif()
diff --git a/src/vpnclient/CMakeLists.txt b/src/vpnclient/CMakeLists.txt
index 9df369ec..24a3196a 100644
--- a/src/vpnclient/CMakeLists.txt
+++ b/src/vpnclient/CMakeLists.txt
@@ -40,11 +40,11 @@ if(UNIX)
   )
 
   install_wrapper_script("vpnclient" "${CMAKE_INSTALL_FULL_LIBEXECDIR}/softether/vpnclient/vpnclient")
-  if(EXISTS "/lib/systemd/system")
+  if(NOT "${CMAKE_INSTALL_SYSTEMD_UNITDIR}" STREQUAL "")
     configure_file(${TOP_DIRECTORY}/systemd/softether-vpnclient.service ${CMAKE_BINARY_DIR}/systemd/softether-vpnclient.service)
     install(FILES ${CMAKE_BINARY_DIR}/systemd/softether-vpnclient.service
       COMPONENT "vpnclient"
-      DESTINATION "/lib/systemd/system"
+      DESTINATION ${CMAKE_INSTALL_SYSTEMD_UNITDIR}
       PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
     )
   endif()
diff --git a/src/vpnserver/CMakeLists.txt b/src/vpnserver/CMakeLists.txt
index 26142ee4..dd17f3d6 100644
--- a/src/vpnserver/CMakeLists.txt
+++ b/src/vpnserver/CMakeLists.txt
@@ -40,11 +40,11 @@ if(UNIX)
   )
 
   install_wrapper_script("vpnserver" "${CMAKE_INSTALL_FULL_LIBEXECDIR}/softether/vpnserver/vpnserver")
-  if(EXISTS "/lib/systemd/system")
+  if(NOT "${CMAKE_INSTALL_SYSTEMD_UNITDIR}" STREQUAL "")
     configure_file(${TOP_DIRECTORY}/systemd/softether-vpnserver.service ${CMAKE_BINARY_DIR}/systemd/softether-vpnserver.service)
     install(FILES ${CMAKE_BINARY_DIR}/systemd/softether-vpnserver.service
       COMPONENT "vpnserver"
-      DESTINATION "/lib/systemd/system"
+      DESTINATION ${CMAKE_INSTALL_SYSTEMD_UNITDIR}
       PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
     )
   endif()