24     scmutil,

    24     scmutil,

    25     util,

    25     util,

    26     vfs as vfsmod,

    26     vfs as vfsmod,

    27 )

    27 )

    28 

    28 

    29 from .utils import compression

    30 from .utils import compression

    30 

    31 

    31 # list of requirements that request a clone of all revlog if added/removed

    32 # list of requirements that request a clone of all revlog if added/removed

    32 RECLONES_REQUIREMENTS = {

    33 RECLONES_REQUIREMENTS = {

    33     b'generaldelta',

    34     b'generaldelta',

    56     requirements in the returned set.

    57     requirements in the returned set.

    57     """

    58     """

    58     return {

    59     return {

    59         # The upgrade code does not yet support these experimental features.

    60         # The upgrade code does not yet support these experimental features.

    60         # This is an artificial limitation.

    61         # This is an artificial limitation.

    62         # This was a precursor to generaldelta and was never enabled by default.

    63         # This was a precursor to generaldelta and was never enabled by default.

    63         # It should (hopefully) not exist in the wild.

    64         # It should (hopefully) not exist in the wild.

    64         b'parentdelta',

    65         b'parentdelta',

    65         # Upgrade should operate on the actual store, not the shared link.

    66         # Upgrade should operate on the actual store, not the shared link.

    66         b'shared',

    67         b'shared',