tests/testlib/ext-phase-report.py

changegroup: remove _clnodetorev

cgpacker._clnodetorev is a glorified cache/index of changelog
nodes to revision numbers.

I'm not sure why it exists. Maybe performance? But its presence
is making refactoring of this code more complicated than it needs
to be.

This commit removes the cache and replaces it with direct lookups
against the changelog.

If this cache was for performance reasons, we should be able to
restore it easily enough... after the changegroup refactor is
complete.

Differential Revision: https://phab.mercurial-scm.org/D4189

# tiny extension to report phase changes during transaction

from __future__ import absolute_import

def reposetup(ui, repo):

    def reportphasemove(tr):
        for rev, move in sorted(tr.changes[b'phases'].items()):
            if move[0] is None:
                ui.write((b'test-debug-phase: new rev %d:  x -> %d\n'
                          % (rev, move[1])))
            else:
                ui.write((b'test-debug-phase: move rev %d: %d -> %d\n'
                          % (rev, move[0], move[1])))

    class reportphaserepo(repo.__class__):
        def transaction(self, *args, **kwargs):
            tr = super(reportphaserepo, self).transaction(*args, **kwargs)
            tr.addpostclose(b'report-phase', reportphasemove)
            return tr

    repo.__class__ = reportphaserepo