add support of repository restoration

src/ahriman/application/ahriman.py

@@ -89,6 +89,7 @@ def _parser() -> argparse.ArgumentParser:
     _set_repo_rebuild_parser(subparsers)
     _set_repo_remove_unknown_parser(subparsers)
     _set_repo_report_parser(subparsers)
+    _set_repo_restore_parser(subparsers)
     _set_repo_setup_parser(subparsers)
     _set_repo_sign_parser(subparsers)
     _set_repo_status_update_parser(subparsers)
@@ -409,6 +410,21 @@ def _set_repo_report_parser(root: SubParserAction) -> argparse.ArgumentParser:
     return parser
 
 
+def _set_repo_restore_parser(root: SubParserAction) -> argparse.ArgumentParser:
+    """
+    add parser for package addition subcommand
+    :param root: subparsers for the commands
+    :return: created argument parser
+    """
+    parser = root.add_parser("repo-restore", aliases=["restore"], help="restore repository",
+                             description="restore repository from database file", formatter_class=_formatter)
+    parser.add_argument("-e", "--exit-code", help="return non-zero exit status if result is empty", action="store_true")
+    parser.add_argument("-n", "--now", help="run update function after", action="store_true")
+    parser.add_argument("--without-dependencies", help="do not add dependencies", action="store_true")
+    parser.set_defaults(handler=handlers.Add, package=None, source=PackageSource.AUR)
+    return parser
+
+
 def _set_repo_setup_parser(root: SubParserAction) -> argparse.ArgumentParser:
     """
     add parser for setup subcommand

src/ahriman/application/handlers/add.py

@@ -19,7 +19,7 @@
 #
 import argparse
 
-from typing import Type
+from typing import List, Type
 
 from ahriman.application.application import Application
 from ahriman.application.handlers.handler import Handler
@@ -43,10 +43,20 @@ class Add(Handler):
         :param unsafe: if set no user check will be performed before path creation
         """
         application = Application(architecture, configuration, no_report, unsafe)
-        application.add(args.package, args.source, args.without_dependencies)
+        packages = Add.extract_packages(application) if args.package is None else args.package
+        application.add(packages, args.source, args.without_dependencies)
         if not args.now:
             return
 
-        packages = application.updates(args.package, True, True, False, True, application.logger.info)
+        packages = application.updates(packages, True, True, False, True, application.logger.info)
         result = application.update(packages)
         Add.check_if_empty(args.exit_code, result.is_empty)
+
+    @staticmethod
+    def extract_packages(application: Application) -> List[str]:
+        """
+        extract packages from database file
+        :param application: application instance
+        :return: list of packages which were stored in database
+        """
+        return [package.base for (package, _) in application.database.packages_get()]