Install relenv-dbg entrypoint

setup.cfg

@@ -29,6 +29,7 @@ where=src
 [options.entry_points]
 console_scripts =
   relenv-gdb = relenv_gdb.gdbinit:main
+  relenv-dbg = relenv_gdb.dbg:main
 
 [flake8]
 max-line-length = 120

src/relenv_gdb/dbg.py

@@ -86,14 +86,16 @@ def main():
     """
     The debug programs entrypoint.
     """
+    parser = argparse.ArgumentParser(
+                    prog='relenv-dbg',
+                    description='Use gdb to debug python programs running in a relenv',
+                    epilog='')
+    parser.add_argument('pid', type=int)
+    args = parser.parse_args()
     try:
-        pid = int(sys.argv[1])
-    except (IndexError, ValueError):
-        pid = -1
-    try:
-        parent = psutil.Process(pid)
+        parent = psutil.Process(args.pid)
     except (ValueError, psutil.NoSuchProcess):
-        print("Please provide a valid pid as the only argument")
+        print("Please provide a valid pid")
         sys.exit(1)
 
     gdb = find_relenv_gdb()