Add a CLI to initialize the database.

opdb/__main__.py

@@ -0,0 +1,51 @@
+# This file is part of the Open Parts Database software
+# Copyright (C) 2022  Valentin Lorentz
+#
+# This program is free software: you can redistribute it and/or modify it under the
+# terms of the GNU Affero General Public License version 3, as published by the
+# Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT ANY
+# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.  See the GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License along with
+# this program.  If not, see <http://www.gnu.org/licenses/>.
+
+"""
+CLI entrypoint.
+"""
+
+import sys
+import typing
+
+
+def error(msg: str) -> typing.NoReturn:
+    """Prints the message on stderr and exits with code 1."""
+    print(msg, file=sys.stderr)
+    sys.exit(1)
+
+
+def main() -> None:
+    """CLI entrypoint"""
+    try:
+        (executable, subcommand, *args) = sys.argv
+    except ValueError:
+        error(f"Syntax: {sys.argv[0]} <subcommand> [<arg1> [<arg2> [...]]]")
+
+    if subcommand == "initdb":
+        from opdb.db import Db  # pylint: disable=import-outside-toplevel
+
+        try:
+            (dsn,) = args
+        except ValueError:
+            error(f"Syntax: {executable} initdb <libpq DSN>")
+
+        with Db.open(dsn) as db:
+            db.init()
+    else:
+        error(f"Unknown subcommand: {subcommand}")
+
+
+if __name__ == "__main__":
+    main()

opdb/conftest.py

@@ -18,7 +18,7 @@ pytest fixtures
 
 import pytest
 
-from opdb.db import Db, models
+from opdb.db import Db
 
 
 def iter_subclasses(cls):
@@ -35,9 +35,6 @@ def opdb_db(postgresql) -> Db:
     """
     pytest fixture which yields an empty initialized OPDB database.
     """
-    with postgresql.cursor() as cur:
-        for name in dir(models):
-            cls = getattr(models, name)
-            if hasattr(cls, "TABLE"):
-                cur.execute(cls.db_schema())
-    return Db(postgresql)
+    db = Db(postgresql)
+    db.init()
+    return db

opdb/db/db.py

@@ -44,6 +44,16 @@ class Db:
         with psycopg.connect(dsn) as conn:
             yield Db(conn)
 
+    def init(self) -> None:
+        """
+        Initializes the schema for the connected database.
+        """
+        with self.conn.cursor() as cur:
+            for name in dir(models):
+                cls = getattr(models, name)
+                if hasattr(cls, "TABLE"):
+                    cur.execute(cls.db_schema())
+
     def get_last_web_page_snapshot(
         self, url: str
     ) -> typing.Optional[models.WebPageSnapshot]: