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On 11/2/20 10:17 AM, kai wrote:

From: Kai Kang <kai.kang@windriver.com>

Make systemctl prints help mesages if run without any argument. It helps
to judge whether systemctl works in postscripts in systemd.bbclass.

Remove trailing white spaces as well.

Signed-off-by: Kai Kang <kai.kang@windriver.com>
---
 meta/recipes-core/systemd/systemd-systemctl/systemctl | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/meta/recipes-core/systemd/systemd-systemctl/systemctl b/meta/recipes-core/systemd/systemd-systemctl/systemctl
index 990de1ab39..c692b65920 100755
--- a/meta/recipes-core/systemd/systemd-systemctl/systemctl
+++ b/meta/recipes-core/systemd/systemd-systemctl/systemctl
@@ -30,7 +30,7 @@ class SystemdFile():
         self._parse(root, path)
         dirname = os.path.basename(path.name) + ".d"
         for location in locations:
-            for path2 in sorted((root / location / "system" / dirname).glob("*.conf")):                
+            for path2 in sorted((root / location / "system" / dirname).glob("*.conf")):
                 self._parse(root, path2)
 
     def _parse(self, root, path):
@@ -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()