systemd.bbclass: allow recipe to inherit systemd with empty SYSTEMD_SERVICE

* I have use case where common recipe does inherit systemd and only some BSP's are bbappending some SERVICEs to it
* install was moved intentionaly, so that /lib/systemd/system is not
  created if there is no .service file (causing QA Warning about
  unpackaged dir)

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

1 files changed, 5 insertions, 6 deletions

diff --git a/meta-oe/classes/systemd.bbclass b/meta-oe/classes/systemd.bbclass
index d8e30f4af9..db35717f63 100644
--- a/meta-oe/classes/systemd.bbclass
+++ b/meta-oe/classes/systemd.bbclass
@@ -58,8 +58,6 @@ def systemd_after_parse(d):
                 for pkg_systemd in systemd_pkgs.split():
                         service_pkg = 'SYSTEMD_SERVICE' + "_" + pkg_systemd
                         systemd_services = d.getVar(service_pkg, 1) or d.getVar('SYSTEMD_SERVICE', 1) or ""
-                        if systemd_services == "":
-                                raise bb.build.FuncFailed, "\n\n%s inherits systemd but doesn't set SYSTEMD_SERVICE / %s" % (bb_filename, service_pkg)
 
         # prepend systemd-packages not already included
         def systemd_create_package(pkg_systemd):
@@ -84,11 +82,11 @@ python __anonymous() {
 
 # automatically install all *.service and *.socket supplied in recipe's SRC_URI
 do_install_append() {
-    install -d ${D}${systemd_unitdir}/system
     for service in `find ${WORKDIR} -maxdepth 1 -name '*.service' -o -name '*.socket'` ; do
         # ensure installing systemd-files only (e.g not avahi *.service)
         if grep -q '\[Unit\]' $service ; then
-                install -m 644 $service ${D}${systemd_unitdir}/system
+                install -d ${D}${systemd_unitdir}/system
+                install -m 644 $service ${D}${systemd_unitdir}/system
         fi
     done
 }
@@ -203,7 +201,8 @@ python populate_packages_prepend () {
         # run all modifications once when creating package
         if os.path.exists('${D}'):
                 for pkg_systemd in d.getVar('SYSTEMD_PACKAGES', 1).split():
-                        systemd_generate_package_scripts(pkg_systemd)
-                        systemd_add_rdepends(pkg_systemd)
+                        if d.getVar('SYSTEMD_SERVICE' + "_" + pkg_systemd, 1) and d.getVar('SYSTEMD_SERVICE' + "_" + pkg_systemd, 1).strip():
+                                systemd_generate_package_scripts(pkg_systemd)
+                                systemd_add_rdepends(pkg_systemd)
                 systemd_check_services()
 }