When compose-partial-copy is executed with -n/--dry-run it prints out the rsync command that it will run, which is very handy.
I'd also like the option to run the rsync itself with the rsync --dry-run flag so that I can see what is outbound before running compose-partial-copy for real
You can do that!
From man page:
-n, --dry-run Only print rsync commands, do not copy anything. You can append -- --dry-run at the end of command line to pass the dry-run option to rsync. In that case it will actually be called, but just print some debugging information.
Essentially -- will stop processing further arguments and just pass them torsync.
--
rsync