Install systemd services with autotools

Change-Id: I563559f5b501eded44efafc60bb0c9ffdea20b3e

Makefile.am

@@ -1,5 +1,5 @@
 ## Process this file with automake to produce Makefile.in
-SUBDIRS = lib gtp ggsn sgsnemu doc tests
+SUBDIRS = lib gtp ggsn sgsnemu doc contrib tests
 
 pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = libgtp.pc
@@ -12,4 +12,7 @@ dist-hook:
 
 EXTRA_DIST = git-version-gen .version README.md README.FreeBSD README.MacOSX
 
+DISTCHECK_CONFIGURE_FLAGS = \
+	--with-systemdsystemunitdir=$$dc_install_base/$(systemdsystemunitdir)
+
 @RELMAKE@

configure.ac

@@ -169,6 +169,22 @@ then
 	CPPFLAGS="$CPPFLAGS $WERROR_FLAGS"
 fi
 
+# https://www.freedesktop.org/software/systemd/man/daemon.html
+AC_ARG_WITH([systemdsystemunitdir],
+     [AS_HELP_STRING([--with-systemdsystemunitdir=DIR], [Directory for systemd service files])],,
+     [with_systemdsystemunitdir=auto])
+AS_IF([test "x$with_systemdsystemunitdir" = "xyes" -o "x$with_systemdsystemunitdir" = "xauto"], [
+     def_systemdsystemunitdir=$($PKG_CONFIG --variable=systemdsystemunitdir systemd)
+
+     AS_IF([test "x$def_systemdsystemunitdir" = "x"],
+   [AS_IF([test "x$with_systemdsystemunitdir" = "xyes"],
+    [AC_MSG_ERROR([systemd support requested but pkg-config unable to query systemd package])])
+    with_systemdsystemunitdir=no],
+   [with_systemdsystemunitdir="$def_systemdsystemunitdir"])])
+AS_IF([test "x$with_systemdsystemunitdir" != "xno"],
+      [AC_SUBST([systemdsystemunitdir], [$with_systemdsystemunitdir])])
+AM_CONDITIONAL([HAVE_SYSTEMD], [test "x$with_systemdsystemunitdir" != "xno"])
+
 AC_MSG_RESULT([CFLAGS="$CFLAGS"])
 AC_MSG_RESULT([CPPFLAGS="$CPPFLAGS"])
 
@@ -181,6 +197,8 @@ AC_CONFIG_FILES([Makefile
                  intl/Makefile
                  po/Makefile
                  sgsnemu/Makefile
+                 contrib/Makefile
+                 contrib/systemd/Makefile
                  tests/Makefile
                  tests/lib/Makefile
                  tests/gtp/Makefile

contrib/Makefile.am

@@ -0,0 +1 @@
+SUBDIRS = systemd

contrib/systemd/Makefile.am

@@ -0,0 +1,5 @@
+if HAVE_SYSTEMD
+EXTRA_DIST = osmo-ggsn.service
+systemdsystemunit_DATA = \
+  osmo-ggsn.service
+endif

debian/osmo-ggsn.install

@@ -1,3 +1,4 @@
+/lib/systemd/system/osmo-ggsn.service
 /usr/bin/osmo-ggsn
 /usr/bin/sgsnemu
 /usr/share/man/man8/*

debian/osmo-ggsn.service

@@ -1 +0,0 @@
-../contrib/osmo-ggsn.service

debian/rules

@@ -17,3 +17,6 @@ export DEB_BUILD_MAINT_OPTIONS = hardening=+all
 override_dh_strip:
 	dh_strip -posmo-ggsn --dbg-package=osmo-ggsn-dbg
 	dh_strip -plibgtp3 --dbg-package=libgtp-dbg
+
+override_dh_auto_configure:
+	dh_auto_configure -- --with-systemdsystemunitdir=/lib/systemd/system