comparison mercurial/copies.py @ 47469:5fa083a5ff04

copies: Keep changelog sidedata file open during copy tracing

Instead of having a callback that opens and closes that file many times,
a add and use a context manager method on the `revlog` class that keeps
files open for its duration.

Differential Revision: https://phab.mercurial-scm.org/D10888

47468:75d4e60c7c81

                    continue
                children_count[r] = 0
                if p in children_count:
                    children_count[p] += 1
        revinfo = _revinfo_getter(repo, match)
        return _combine_changeset_copies(
            revs,
            children_count,
            b.rev(),
            revinfo,
            match,
            isancestor,
            multi_thread,
        )
    else:
        # When not using side-data, we will process the edges "from" the parent.
        # so we need a full mapping of the parent -> children relation.
        children = dict((r, []) for r in roots)
        for r in revs:

47469:5fa083a5ff04

                    continue
                children_count[r] = 0
                if p in children_count:
                    children_count[p] += 1
        revinfo = _revinfo_getter(repo, match)
        with repo.changelog.reading():
            return _combine_changeset_copies(
                revs,
                children_count,
                b.rev(),
                revinfo,
                match,
                isancestor,
                multi_thread,
            )
    else:
        # When not using side-data, we will process the edges "from" the parent.
        # so we need a full mapping of the parent -> children relation.
        children = dict((r, []) for r in roots)
        for r in revs: