do not use set_defaults for architecture arguments

according to the source code defaults always updates the values
dictionary. This in this specific case it is impossible to override the
value it will be always empty list.

In order to handle it we are adding another property to the Handler
class which allows to run with None architecture list.

This particular set_defaults behaviour is still useful for other cases
when we have to run command without any specific architecture

src/ahriman/application/ahriman.py

@@ -95,7 +95,7 @@ def _set_add_parser(root: SubParserAction) -> argparse.ArgumentParser:
     parser.add_argument("--source", help="package source", choices=PackageSource, type=PackageSource,
                         default=PackageSource.Auto)
     parser.add_argument("--without-dependencies", help="do not add dependencies", action="store_true")
-    parser.set_defaults(handler=handlers.Add, architecture=[])
+    parser.set_defaults(handler=handlers.Add)
     return parser
 
 
@@ -110,7 +110,7 @@ def _set_check_parser(root: SubParserAction) -> argparse.ArgumentParser:
                              formatter_class=argparse.ArgumentDefaultsHelpFormatter)
     parser.add_argument("package", help="filter check by package base", nargs="*")
     parser.add_argument("--no-vcs", help="do not check VCS packages", action="store_true")
-    parser.set_defaults(handler=handlers.Update, architecture=[], no_aur=False, no_manual=True, dry_run=True)
+    parser.set_defaults(handler=handlers.Update, no_aur=False, no_manual=True, dry_run=True)
     return parser
 
 
@@ -127,7 +127,7 @@ def _set_clean_parser(root: SubParserAction) -> argparse.ArgumentParser:
     parser.add_argument("--no-chroot", help="do not clear build chroot", action="store_true")
     parser.add_argument("--no-manual", help="do not clear directory with manually added packages", action="store_true")
     parser.add_argument("--no-packages", help="do not clear directory with built packages", action="store_true")
-    parser.set_defaults(handler=handlers.Clean, architecture=[], no_log=True, unsafe=True)
+    parser.set_defaults(handler=handlers.Clean, no_log=True, unsafe=True)
     return parser
 
 
@@ -181,7 +181,7 @@ def _set_rebuild_parser(root: SubParserAction) -> argparse.ArgumentParser:
     parser = root.add_parser("rebuild", help="rebuild repository", description="rebuild whole repository",
                              formatter_class=argparse.ArgumentDefaultsHelpFormatter)
     parser.add_argument("--depends-on", help="only rebuild packages that depend on specified package", action="append")
-    parser.set_defaults(handler=handlers.Rebuild, architecture=[])
+    parser.set_defaults(handler=handlers.Rebuild)
     return parser
 
 
@@ -194,7 +194,7 @@ def _set_remove_parser(root: SubParserAction) -> argparse.ArgumentParser:
     parser = root.add_parser("remove", help="remove package", description="remove package",
                              formatter_class=argparse.ArgumentDefaultsHelpFormatter)
     parser.add_argument("package", help="package name or base", nargs="+")
-    parser.set_defaults(handler=handlers.Remove, architecture=[])
+    parser.set_defaults(handler=handlers.Remove)
     return parser
 
 
@@ -208,7 +208,7 @@ def _set_remove_unknown_parser(root: SubParserAction) -> argparse.ArgumentParser
                              description="remove packages which are missing in AUR",
                              formatter_class=argparse.ArgumentDefaultsHelpFormatter)
     parser.add_argument("--dry-run", help="just perform check for packages without removal", action="store_true")
-    parser.set_defaults(handler=handlers.RemoveUnknown, architecture=[])
+    parser.set_defaults(handler=handlers.RemoveUnknown)
     return parser
 
 
@@ -221,7 +221,7 @@ def _set_report_parser(root: SubParserAction) -> argparse.ArgumentParser:
     parser = root.add_parser("report", help="generate report", description="generate report",
                              formatter_class=argparse.ArgumentDefaultsHelpFormatter)
     parser.add_argument("target", help="target to generate report", nargs="*")
-    parser.set_defaults(handler=handlers.Report, architecture=[])
+    parser.set_defaults(handler=handlers.Report)
     return parser
 
 
@@ -269,7 +269,7 @@ def _set_sign_parser(root: SubParserAction) -> argparse.ArgumentParser:
     parser = root.add_parser("sign", help="sign packages", description="(re-)sign packages and repository database",
                              formatter_class=argparse.ArgumentDefaultsHelpFormatter)
     parser.add_argument("package", help="sign only specified packages", nargs="*")
-    parser.set_defaults(handler=handlers.Sign, architecture=[])
+    parser.set_defaults(handler=handlers.Sign)
     return parser
 
 
@@ -316,7 +316,7 @@ def _set_sync_parser(root: SubParserAction) -> argparse.ArgumentParser:
     parser = root.add_parser("sync", help="sync repository", description="sync packages to remote server",
                              formatter_class=argparse.ArgumentDefaultsHelpFormatter)
     parser.add_argument("target", help="target to sync", nargs="*")
-    parser.set_defaults(handler=handlers.Sync, architecture=[])
+    parser.set_defaults(handler=handlers.Sync)
     return parser
 
 
@@ -333,7 +333,7 @@ def _set_update_parser(root: SubParserAction) -> argparse.ArgumentParser:
     parser.add_argument("--no-aur", help="do not check for AUR updates. Implies --no-vcs", action="store_true")
     parser.add_argument("--no-manual", help="do not include manual updates", action="store_true")
     parser.add_argument("--no-vcs", help="do not check VCS packages", action="store_true")
-    parser.set_defaults(handler=handlers.Update, architecture=[])
+    parser.set_defaults(handler=handlers.Update)
     return parser
 
 

src/ahriman/application/handlers/dump.py

@@ -30,6 +30,8 @@ class Dump(Handler):
     dump configuration handler
     """
 
+    ALLOW_AUTO_ARCHITECTURE_RUN = False
+
     _print = print
 
     @classmethod

src/ahriman/application/handlers/handler.py

@@ -34,9 +34,11 @@ from ahriman.models.repository_paths import RepositoryPaths
 class Handler:
     """
     base handler class for command callbacks
+    :cvar ALLOW_AUTO_ARCHITECTURE_RUN: allow to define architecture from existing repositories
     :cvar ALLOW_MULTI_ARCHITECTURE_RUN: allow to run with multiple architectures
     """
 
+    ALLOW_AUTO_ARCHITECTURE_RUN = True
     ALLOW_MULTI_ARCHITECTURE_RUN = True
 
     @classmethod
@@ -85,9 +87,11 @@ class Handler:
         :param args: command line args
         :return: list of architectures for which tree is created
         """
-        if args.architecture is None:
+        if not cls.ALLOW_AUTO_ARCHITECTURE_RUN and args.architecture is None:
+            # for some parsers (e.g. config) we need to run with specific architecture
+            # for those cases architecture must be set explicitly
             raise MissingArchitecture(args.command)
-        if args.architecture:
+        if args.architecture:  # architecture is specified explicitly
             return set(args.architecture)
 
         config = Configuration()
@@ -96,7 +100,7 @@ class Handler:
         root = config.getpath("repository", "root")  # pylint: disable=assignment-from-no-return
         architectures = RepositoryPaths.known_architectures(root)
 
-        if not architectures:
+        if not architectures:  # well we did not find anything
             raise MissingArchitecture(args.command)
         return architectures
 

src/ahriman/application/handlers/init.py

@@ -31,6 +31,8 @@ class Init(Handler):
     repository init handler
     """
 
+    ALLOW_AUTO_ARCHITECTURE_RUN = False
+
     @classmethod
     def run(cls: Type[Handler], args: argparse.Namespace, architecture: str,
             configuration: Configuration, no_report: bool) -> None:

src/ahriman/application/handlers/key_import.py

@@ -31,6 +31,8 @@ class KeyImport(Handler):
     key import packages handler
     """
 
+    ALLOW_AUTO_ARCHITECTURE_RUN = False  # it should be called only as "no-architecture"
+
     @classmethod
     def run(cls: Type[Handler], args: argparse.Namespace, architecture: str,
             configuration: Configuration, no_report: bool) -> None:

src/ahriman/application/handlers/search.py

@@ -31,6 +31,8 @@ class Search(Handler):
     packages search handler
     """
 
+    ALLOW_AUTO_ARCHITECTURE_RUN = False  # it should be called only as "no-architecture"
+
     @classmethod
     def run(cls: Type[Handler], args: argparse.Namespace, architecture: str,
             configuration: Configuration, no_report: bool) -> None:

src/ahriman/application/handlers/setup.py

@@ -37,6 +37,8 @@ class Setup(Handler):
     :cvar SUDOERS_PATH: path to sudoers.d include configuration
     """
 
+    ALLOW_AUTO_ARCHITECTURE_RUN = False
+
     ARCHBUILD_COMMAND_PATH = Path("/usr/bin/archbuild")
     BIN_DIR_PATH = Path("/usr/local/bin")
     MIRRORLIST_PATH = Path("/etc/pacman.d/mirrorlist")

src/ahriman/application/handlers/status.py

@@ -33,6 +33,8 @@ class Status(Handler):
     package status handler
     """
 
+    ALLOW_AUTO_ARCHITECTURE_RUN = False
+
     @classmethod
     def run(cls: Type[Handler], args: argparse.Namespace, architecture: str,
             configuration: Configuration, no_report: bool) -> None:

src/ahriman/application/handlers/status_update.py

@@ -32,6 +32,8 @@ class StatusUpdate(Handler):
     status update handler
     """
 
+    ALLOW_AUTO_ARCHITECTURE_RUN = False
+
     @classmethod
     def run(cls: Type[Handler], args: argparse.Namespace, architecture: str,
             configuration: Configuration, no_report: bool) -> None:

src/ahriman/application/handlers/user.py

@@ -35,6 +35,8 @@ class User(Handler):
     user management handler
     """
 
+    ALLOW_AUTO_ARCHITECTURE_RUN = False  # it should be called only as "no-architecture"
+
     @classmethod
     def run(cls: Type[Handler], args: argparse.Namespace, architecture: str,
             configuration: Configuration, no_report: bool) -> None:

src/ahriman/application/handlers/web.py

@@ -31,6 +31,7 @@ class Web(Handler):
     web server handler
     """
 
+    ALLOW_AUTO_ARCHITECTURE_RUN = False
     ALLOW_MULTI_ARCHITECTURE_RUN = False  # required to be able to spawn external processes
 
     @classmethod