Add hwloc-dump-hwdata.service systemd service file

It lets systemd run hwloc-dump-hwdata at startup.
We don't install the file but rather let packagers install it for now.

Thanks to Grzegorz Andrejczuk.

Makefile.am

@@ -23,7 +23,7 @@ SUBDIRS += netloc
 endif
 
 if HWLOC_BUILD_STANDALONE
-SUBDIRS += tests utils contrib/misc
+SUBDIRS += tests utils contrib/systemd contrib/misc
 # We need doc/ if HWLOC_BUILD_DOXYGEN, or during make install if HWLOC_INSTALL_DOXYGEN.
 # There's no INSTALL_SUBDIRS, so always enter doc/ and check HWLOC_BUILD/INSTALL_DOXYGEN there
 SUBDIRS += doc

config/hwloc_internal.m4

@@ -314,6 +314,8 @@ EOF
     LIBS="$hwloc_old_LIBS"
     unset hwloc_old_LIBS
 
+    AC_PATH_TOOL(RMPATH, rm)
+
     _HWLOC_CHECK_DIFF_U
     _HWLOC_CHECK_DIFF_W
 
@@ -412,6 +414,7 @@ int foo(void) {
         hwloc_config_prefix[utils/hwloc/test-fake-plugin.sh]
         hwloc_config_prefix[utils/lstopo/test-lstopo.sh]
         hwloc_config_prefix[utils/lstopo/test-lstopo-distances.sh]
+        hwloc_config_prefix[contrib/systemd/Makefile]
         hwloc_config_prefix[contrib/misc/Makefile]
         hwloc_config_prefix[tests/netloc/Makefile]
     )

contrib/systemd/Makefile.am

@@ -0,0 +1,22 @@
+# Copyright © 2016 Inria.  All rights reserved.
+# See COPYING in top-level directory.
+
+# We can't use autoconf because we don't want $sbindir to be replaced with ${exec_prefix}/sbin
+# Also don't install since , let the packagers do it.
+
+EXTRA_DIST = hwloc-dump-hwdata.service.in
+
+if HWLOC_HAVE_LINUX
+nodist_pkgdata_DATA = hwloc-dump-hwdata.service
+# depend on Makefile in case we rerun configure with different directory arguments
+hwloc-dump-hwdata.service: hwloc-dump-hwdata.service.in Makefile
+	@echo Creating $@...
+	@ $(SED) \
+	  -e 's@#SBINDIR#@'$(sbindir)'@g' \
+	  -e 's@#RUNSTATEDIR#@'$(HWLOC_runstatedir)'@g' \
+	  -e 's@#RMPATH#@'$(RMPATH)'@g' \
+	  > $@ < $<
+
+distclean-local:
+	rm -f hwloc-dump-hwdata.service
+endif

contrib/systemd/hwloc-dump-hwdata.service.in

@@ -0,0 +1,22 @@
+#
+# Copyright © 2015-2016 Intel, Inc.  All rights reserved.
+# Copyright © 2016 Inria.  All rights reserved.
+# See COPYING in top-level directory.
+#
+# #RUNSTATEDIR#/hwloc was specified at configure time.
+# It may be changed by passing configure options such as --runstatedir,
+# --localstatedir or --prefix.
+# It may also be manually changed before installing this file in systemd directories.
+#
+
+[Unit]
+Description=Dump hardware topology and locality information to #RUNSTATEDIR#/hwloc
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=#SBINDIR#/hwloc-dump-hwdata -o #RUNSTATEDIR#/hwloc
+ExecStop=#RMPATH# -rf #RUNSTATEDIR#/hwloc
+
+[Install]
+WantedBy=multi-user.target