obs: add --allow-unknown-package

Prepare to add a wireshark package. It will be in its own
osmocom:wireshark repository, and not in osmocom:nightly, :latest,
:master, so it's not added to lib/config.py.

Move lib.set_args() before parse_packages(), so the latter is able to
use lib.args.allow_unknown_package.

Related: OS#2537
Change-Id: I007f937ccb629e0593ec9253541ed05df42fac66

scripts/obs/lib/__init__.py

@@ -27,6 +27,9 @@ def add_shared_arguments(parser):
 			" other feeds build their respective branch.",
                         metavar="FEED", default="nightly",
                         choices=lib.config.feeds)
+    parser.add_argument("-a", "--allow-unknown-package", action="store_true",
+                        help="don't complain if the name of the package is not"
+                             " stored in lib/config.py")
     parser.add_argument("-b", "--git-branch", help="instead of using a branch"
                               " based on the feed, checkout this git branch",
                         metavar="BRANCH", default=None)
@@ -102,6 +105,9 @@ def set_proper_package_name(package):
         if os.path.basename(package_cfg) == package:
             return package_cfg
 
+    if lib.args.allow_unknown_package:
+        return package
+
     print(f"ERROR: unknown package: {package}")
     print("See packages_osmocom and packages_other in obs/lib/config.py")
     exit(1)

scripts/obs/update_obs_project.py

@@ -194,9 +194,8 @@ def main():
                         help="package name, e.g. libosmocore or open5gs,"
                              " default is all packages")
     args = parser.parse_args()
-    packages = parse_packages(args.package)
-
     lib.set_args(args)
+    packages = parse_packages(args.package)
 
     if args.docker:
         lib.docker.run_in_docker_and_exit("update_obs_project.py", True)