~bzr-pqm/bzr/bzr.dev

- start adding refactored/simplified hash cache
not used yet

added added

removed removed

implemented, and in particular should not depend on the particular

data which is stored or its format.

The cache maintains a mapping from filename to the SHA-1 of the

content of the file.

The cache also stores a fingerprint of (size, mtime, ctime, ino, dev)

which is used to validate that the entry is up-to-date.

This is done by maintaining a cache indexed by a file fingerprint of

(path, size, mtime, ctime, ino, dev) pointing to the SHA-1. If the

fingerprint has changed, we assume the file content has not changed