comparison mercurial/revlogutils/nodemap.py @ 44309:6c07480d6659

nodemap: add a function to read the data from disk

This changeset is small and mostly an excuse to introduce an API function
reading the data from disk.

Differential Revision: https://phab.mercurial-scm.org/D7836

44308:5962fd0d1045

class NodeMap(dict):
    def __missing__(self, x):
        raise error.RevlogError(b'unknown node: %s' % x)


def setup_persistent_nodemap(tr, revlog):
    """Install whatever is needed transaction side to persist a nodemap on disk

44309:6c07480d6659

class NodeMap(dict):
    def __missing__(self, x):
        raise error.RevlogError(b'unknown node: %s' % x)


def persisted_data(revlog):
    """read the nodemap for a revlog from disk"""
    if revlog.nodemap_file is None:
        return None
    return revlog.opener.tryread(revlog.nodemap_file)


def setup_persistent_nodemap(tr, revlog):
    """Install whatever is needed transaction side to persist a nodemap on disk