Compute a checksum over all known packet metadata. This can be used to check whether a cache of all metadata needs refreshing (or agrees between two roots) without having to read a lot of data. It is unlikely that most users will call this function.
outpack_checksum(hash_algorithm = NULL, root = NULL)The hash algorithm to use, defaulting to the root's hash algorithm.
The outpack root. Will be searched for from the current directory if not given.
A hash string
This function matches the behaviour (and hash) of the outpack server. We may expand the behaviour or either or both of these to include a similar checksum that includes location data.