File lock not actually acquired

[rmcgibbo]

It looks like the file lock is not actually acquired. If you look at the implementation of AdvisoryLockFile: https://docs.rs/advisory-lock/0.2.0/src/advisory_lock/lib.rs.html#59-74, merely opening the file doesn't acquire the lock -- it's necessary to call the lock function, which doesn't seem like is being done here.