From 6f84dc8b7dcbcac9f0884d4a79164247b6eedacf Mon Sep 17 00:00:00 2001
From: Alberto Fanjul <albertofanjul@gmail.com>
Date: Sat, 28 May 2022 09:59:51 +0200
Subject: [PATCH] Add ENABLE_SYSTEMD config to meson and autotools

---
 CMakeLists.txt    |  2 +-
 configure.ac      | 20 ++++++++++++++++----
 meson.build       |  8 +++++++-
 meson_options.txt |  4 ++++
 4 files changed, 28 insertions(+), 6 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f9d3453..3edc3dc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -11,7 +11,7 @@ set(CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake
 set(CMAKE_C_FLAGS "-std=gnu11 ${CMAKE_C_FLAGS}")
 add_definitions(-D_GNU_SOURCE)
 
-OPTION(ENABLE_SYSTEMD "Enable Systemd support" ON)
+OPTION(ENABLE_SYSTEMD "Enable Systemd" ON)
 
 find_package(PkgConfig)
 
diff --git a/configure.ac b/configure.ac
index bdbce1b..cb4566a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -45,16 +45,28 @@ AC_ARG_VAR(IP_BINARY, [Path for ip binary])
 if test -z "$IP_BINARY"; then
 	IP_BINARY=/bin/ip
 fi
+AC_ARG_ENABLE([disable-systemd],
+              AS_HELP_STRING([--disable-systemd], [Disable systemd]), [], [use_libsystemd=yes], [Disable systemd using elogind])
 AC_DEFINE_UNQUOTED([IP_BINARY], [$IP_BINARY], [Path for ip binary])
 
 #
 # Mandatory dependencies
 #
 
-m4_ifdef([PKG_CHECK_MODULES], [
-	PKG_CHECK_MODULES([DEPS], [libudev libsystemd > 219])
-	PKG_CHECK_MODULES([GLIB], [glib-2.0])
-])
+AS_IF([test "$use_libsystemd" == "yes"],
+  [
+     AC_DEFINE([ENABLE_SYSTEMD], [], [Use systemd])
+     m4_ifdef([PKG_CHECK_MODULES], [
+       PKG_CHECK_MODULES([DEPS], [libudev libsystemd > 219])
+       PKG_CHECK_MODULES([GLIB], [glib-2.0])
+     ])
+  ],
+  [
+     m4_ifdef([PKG_CHECK_MODULES], [
+       PKG_CHECK_MODULES([DEPS], [libudev libelogind])
+       PKG_CHECK_MODULES([GLIB], [glib-2.0])
+     ])
+  ])
 
 AC_CHECK_HEADERS(readline/readline.h,, AC_MSG_ERROR(GNU readline not found))
 
diff --git a/meson.build b/meson.build
index 32beeb7..9b24bdf 100644
--- a/meson.build
+++ b/meson.build
@@ -32,11 +32,17 @@ if get_option('rely-udev')
   add_project_arguments('-DRELY_UDEV', language: 'c')
 endif
 
+if get_option('enable-systemd')
+  add_project_arguments('-DENABLE_SYSTEMD', language: 'c')
+  libsystemd = dependency('libsystemd')
+else
+  libsystemd = dependency('libelogind')
+endif
+
 add_project_arguments('-DIP_BINARY='+get_option('ip-binary'), language: 'c')
 
 glib2 = dependency('glib-2.0')
 udev = dependency('libudev')
-libsystemd = dependency('libsystemd')
 
 subdir('src')
 subdir('res')
diff --git a/meson_options.txt b/meson_options.txt
index 86a6862..e3a94aa 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -14,3 +14,7 @@ option('ip-binary',
   type: 'string',
   value: '/bin/ip',
   description: 'Path for ip binary')
+option('enable-systemd',
+  type: 'boolean',
+  value: 'true',
+  description: 'Enable systemd')