Can't run "bedup show" while dedup is running

[bitplane]

Although sqlite supports multiple concurrent readers, SQLAlchemy tries to write to the locked database:

  File "/usr/local/lib/python3.5/dist-packages/sqlalchemy/engine/base.py", line 1182, in _execute_context
    context)
  File "/usr/local/lib/python3.5/dist-packages/sqlalchemy/engine/default.py", line 462, in do_execute
    cursor.execute(statement, parameters)
sqlite3.OperationalError: database is locked

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/local/bin/bedup", line 11, in <module>
    sys.exit(script_main())
  File "/usr/local/lib/python3.5/dist-packages/bedup/__main__.py", line 497, in script_main
    sys.exit(main(sys.argv))
  File "/usr/local/lib/python3.5/dist-packages/bedup/__main__.py", line 486, in main
    return args.action(args)
  File "/usr/local/lib/python3.5/dist-packages/bedup/__main__.py", line 73, in cmd_show_vols
    sess = get_session(args)
  File "/usr/local/lib/python3.5/dist-packages/bedup/__main__.py", line 103, in get_session
    upgrade_schema(engine)
  File "/usr/local/lib/python3.5/dist-packages/bedup/migrations.py", line 55, in upgrade_schema
    context._version.c.version_num == current_rev))
  File "/usr/local/lib/python3.5/dist-packages/alembic/ddl/impl.py", line 118, in _exec
    return conn.execute(construct, *multiparams, **params)
  File "/usr/local/lib/python3.5/dist-packages/sqlalchemy/engine/base.py", line 945, in execute
    return meth(self, multiparams, params)
  File "/usr/local/lib/python3.5/dist-packages/sqlalchemy/sql/elements.py", line 263, in _execute_on_connection
    return connection._execute_clauseelement(self, multiparams, params)
  File "/usr/local/lib/python3.5/dist-packages/sqlalchemy/engine/base.py", line 1053, in _execute_clauseelement
    compiled_sql, distilled_params
  File "/usr/local/lib/python3.5/dist-packages/sqlalchemy/engine/base.py", line 1189, in _execute_context
    context)
  File "/usr/local/lib/python3.5/dist-packages/sqlalchemy/engine/base.py", line 1393, in _handle_dbapi_exception
    exc_info
  File "/usr/local/lib/python3.5/dist-packages/sqlalchemy/util/compat.py", line 202, in raise_from_cause
    reraise(type(exception), exception, tb=exc_tb, cause=cause)
  File "/usr/local/lib/python3.5/dist-packages/sqlalchemy/util/compat.py", line 185, in reraise
    raise value.with_traceback(tb)
  File "/usr/local/lib/python3.5/dist-packages/sqlalchemy/engine/base.py", line 1182, in _execute_context
    context)
  File "/usr/local/lib/python3.5/dist-packages/sqlalchemy/engine/default.py", line 462, in do_execute
    cursor.execute(statement, parameters)
sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) database is locked [SQL: 'UPDATE alembic_version SET version_num=? WHERE alembic_version.version_num = ?'] [parameters: (1, 1)]```