comparison mercurial/configitems.py @ 46884:cc3ad5c3af3b

persistent-nodemap: enable the feature by default when using Rust

As discussed at the 5.6 sprint, we can make it enabled by default, but only for
Rust installation.

Differential Revision: https://phab.mercurial-scm.org/D9765

46883:df76da69f5b1

coreconfigitem(
    b'format',
    b'usestore',
    default=True,
)
coreconfigitem(
    b'format',
    b'use-persistent-nodemap',
    default=False,
)
# TODO needs to grow a docket file to at least store the last offset of the data
# file when rewriting sidedata.
# Will also need a way of dealing with garbage data if we allow rewriting
# *existing* sidedata.

46884:cc3ad5c3af3b

coreconfigitem(
    b'format',
    b'usestore',
    default=True,
)


def _persistent_nodemap_default():
    """compute `use-persistent-nodemap` default value

    The feature is disabled unless a fast implementation is available.
    """
    from . import policy

    return policy.importrust('revlog') is not None


coreconfigitem(
    b'format',
    b'use-persistent-nodemap',
    default=_persistent_nodemap_default,
)
# TODO needs to grow a docket file to at least store the last offset of the data
# file when rewriting sidedata.
# Will also need a way of dealing with garbage data if we allow rewriting
# *existing* sidedata.