buf alpha repo sync \
  # This would read the module name in the HEAD commit,
  # and only sync commits back in time that matched that name.
  --module my/proto/dir

buf alpha repo sync \
  # This will read the module name in the HEAD commit,
  # and only sync commits back in time that matched that name.
  --module my/proto/dir
  # This will use "buf.build/acme/foo" as the module target
  # identity for all branches, regardless of the module name
  # they have in the git commits, or even if they are unnamed.
  --module other/proto/dir:buf.build/acme/foo