systemd-systemctl-native: capable to call without argument

In systemd.bbclass, it will replace criterion command 'type systemctl'
with 'systemctl' without any argument to judge whether command systemctl
is available. The change is to fix install/remove package error in
container when command systemctl exists but not callable.

Make native systemctl wrapper prints help mesages if called without any
argument to follow the update.

Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/meta/recipes-core/systemd/systemd-systemctl/systemctl b/meta/recipes-core/systemd/systemd-systemctl/systemctl
index 990de1ab399d5b98c84edd29d63a6723df52f54d..de733e255bc91592a80e9ce98896d724dd29f57b 100755 (executable)
--- a/meta/recipes-core/systemd/systemd-systemctl/systemctl
+++ b/meta/recipes-core/systemd/systemd-systemctl/systemctl
@@ -282,7 +282,7 @@ def main():
         sys.exit("Python 3.4 or greater is required")
 
     parser = argparse.ArgumentParser()
-    parser.add_argument('command', nargs=1, choices=['enable', 'mask',
+    parser.add_argument('command', nargs='?', choices=['enable', 'mask',
                                                      'preset-all'])
     parser.add_argument('service', nargs=argparse.REMAINDER)
     parser.add_argument('--root')
@@ -300,7 +300,11 @@ def main():
         locations.append(BASE_LIBDIR / "systemd")
     locations.append(LIBDIR / "systemd")
 
-    command = args.command[0]
+    command = args.command
+    if not command:
+        parser.print_help()
+        return 0
+
     if command == "mask":
         for service in args.service:
             SystemdUnit(root, service).mask()