Medusa is a simple system for managing data sets as collection of files, described using a simple metadata format. It uses cryptographic signatures to identify data objects (Content-Adressable Storage, similar to Git), and maintains a block-chain ledger of its operations.
The command line tool, mdz provides access to most of the
functionality. It requires an address for the repository, a user-id,
and an RSA key. This can be configured in a config file .mdzrc:
username = Ketil Malde
userid = ketil@malde.org
rsakey = ~/.ssh/id_rsa
repository = /tmp/medusa
These can be overriden by the environment variables MDZREPO,
MDZUSERID, MDZUSERNAME, and MDZKEY.
If the repository is an SSH path (e.g.,
ketil@malde.org:/tmp/medusa), mdz will recognize that and use
SFTP, if not, it will work directly on the file system. Possible
commands are:
mdz init- initialize a repositorymdz log- list repository ledger entriesmdz search- show datasetsmdz validate- validate a local data setmdz import- copy a local data set into the repositorymdz export- extract a data set from the repository
(To be continued)