added pwd facility

set_pwd.py

@@ -0,0 +1,48 @@
+#!/usr/bin/env python3
+"""Set a L@pp user's password from the command line."""
+
+import argparse
+import sys
+
+import sqlalchemy as sa
+
+from lapp import create_app
+from models import User, db
+
+
+def parse_args():
+    parser = argparse.ArgumentParser(
+        description="Set a new password for an existing L@pp user.",
+        usage="%(prog)s <username> <new-pwd>",
+    )
+    parser.add_argument("username", help="name of the user to update")
+    parser.add_argument("new_password", metavar="new-pwd", help="new password")
+    return parser, parser.parse_args()
+
+
+def main():
+    parser, args = parse_args()
+
+    if not args.username:
+        parser.error("username must not be empty")
+    if not args.new_password:
+        parser.error("new-pwd must not be empty")
+
+    app = create_app()
+    with app.app_context():
+        user = db.session.scalar(
+            sa.select(User).where(User.name == args.username)
+        )
+        if user is None:
+            print(f"User {args.username!r} does not exist.", file=sys.stderr)
+            return 1
+
+        user.set_password(args.new_password)
+        db.session.commit()
+
+    print(f"Password updated for user {args.username!r}.")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())