Function identity 

pub fn identity(root: &Path) -> String

A repository’s identity over the wire: a digest of its absolute root.

A server on a loopback socket has to be able to say which repository it serves, so that a second process can tell a live server for this repository from one for another. The root itself would answer that and would also tell whoever reached the socket where the checkout sits on the host, which is of no use to them and of some use to somebody else. A digest answers the question and discloses nothing: a process that already knows the root can compute it and compare, and a process that does not cannot invert it.

Two repositories at one path are one repository, which is exactly the identity a lease needs. A repository that moves is a different one, which is also right: the lease of the old path names a server that is no longer serving that path.

use majordomus_cli::repository::identity;
use std::path::Path;
assert_eq!(identity(Path::new("/a/b")), identity(Path::new("/a/b")));
assert_ne!(identity(Path::new("/a/b")), identity(Path::new("/a/c")));
assert_eq!(identity(Path::new("/a/b")).len(), 32);
assert!(!identity(Path::new("/a/b")).contains('/'));