Changing the target of logging

We have an application that runs in multiple batches where inputs and outputs of a given batch have their own directory batchX. It would be useful if the log file were also inside this directory which requires changing the target at runtime. We currently do this by defining a custom type with internal locking to impl Write on and then initialize it as static to satisfy 'static lifetime of Target::Pipe, which seems a bit awkward.

Is there a better way to accommodate this?

Start by reading the Target::Pipe API and the runtime initialization approach described in the issue, focusing on its 'static lifetime requirement and how output targets are selected. Determine the supported design for changing a log target between batches; done means the approach is defined clearly and, if accepted, works without a custom statically initialized writer.