bup validate-object-links scans the objects in the repository for and reports any “broken links” it
finds, i.e. any links from a tree or commit in the repository to an object that doesn’t exist.
Currently, it doesn’t include “loose objects” (those not in packfiles – which git may create, but bup
doesn’t), and it can’t handle tag objects (which bup also doesn’t create).
Whenever a broken link (missing reference) is found, an ASCII encoded line formatted like this will be
printed to standard output:
no MISSING_HASH for PARENT_HASH