options.
--cat-blob-fd=<fd>::
- Specify the file descriptor that will be written to
- when the `cat-blob` command is encountered in the stream.
- The default behaviour is to write to `stdout`.
+ Write responses to `cat-blob` and `ls` queries to the
+ file descriptor <fd> instead of `stdout`. Allows `progress`
+ output intended for the end-user to be separated from other
+ output.
--done::
- Require a `done` command at the end of the stream.
+ Terminate with error if there is no `done` command at the
+ end of the stream.
This option might be useful for detecting errors that
cause the frontend to terminate before it has started to
write a stream.