comparison mercurial/revlog.py @ 19326:7014526d67a8

revlog: add exception when linkrev == nullrev

When we deployed the latest crew mercurial to our users, a few of them
had issues where a filelog would have an entry with a -1 linkrev. This
caused operations like rebase and amend to create a bundle containing the
entire repository, which took a long time.

I don't know what the issue is, but adding this check should prevent repos
from getting in this state, and should help us pinpoint the issue next time
it happens.

19325:ec896f9e8894

        transaction - the transaction object used for rollback
        link - the linkrev data to add
        p1, p2 - the parent nodeids of the revision
        cachedelta - an optional precomputed delta
        """
        node = hash(text, p1, p2)
        if node in self.nodemap:
            return node

        dfh = None

19326:7014526d67a8

        transaction - the transaction object used for rollback
        link - the linkrev data to add
        p1, p2 - the parent nodeids of the revision
        cachedelta - an optional precomputed delta
        """
        if link == nullrev:
            raise RevlogError(_("attempted to add linkrev -1 to %s")
                              % self.indexfile)
        node = hash(text, p1, p2)
        if node in self.nodemap:
            return node

        dfh = None