392 # huge amounts of memory, because the whole span would be read at once,

   392 # huge amounts of memory, because the whole span would be read at once,

   393 # including all the intermediate revisions that aren't pertinent for the chain.

   393 # including all the intermediate revisions that aren't pertinent for the chain.

   394 # This is why once a repository has enabled sparse-read, it becomes required.

   394 # This is why once a repository has enabled sparse-read, it becomes required.

   395 SPARSEREVLOG_REQUIREMENT = 'sparserevlog'

   395 SPARSEREVLOG_REQUIREMENT = 'sparserevlog'

   396 

   396 

   397 # Functions receiving (ui, features) that extensions can register to impact

   401 # Functions receiving (ui, features) that extensions can register to impact

   398 # the ability to load repositories with custom requirements. Only

   402 # the ability to load repositories with custom requirements. Only

   399 # functions defined in loaded extensions are called.

   403 # functions defined in loaded extensions are called.

   400 #

   404 #

   401 # The function receives a set of requirement strings that the repository

   405 # The function receives a set of requirement strings that the repository

   812     sparserevlog = SPARSEREVLOG_REQUIREMENT in requirements

   816     sparserevlog = SPARSEREVLOG_REQUIREMENT in requirements

   813     options[b'sparse-revlog'] = sparserevlog

   817     options[b'sparse-revlog'] = sparserevlog

   814     if sparserevlog:

   818     if sparserevlog:

   815         options[b'generaldelta'] = True

   819         options[b'generaldelta'] = True

   816 

   820 

   817     maxchainlen = None

   824     maxchainlen = None

   818     if sparserevlog:

   825     if sparserevlog:

   819         maxchainlen = revlogconst.SPARSE_REVLOG_MAX_CHAIN_LENGTH

   826         maxchainlen = revlogconst.SPARSE_REVLOG_MAX_CHAIN_LENGTH

   820     # experimental config: format.maxchainlen

   827     # experimental config: format.maxchainlen

   821     maxchainlen = ui.configint(b'format', b'maxchainlen', maxchainlen)

   828     maxchainlen = ui.configint(b'format', b'maxchainlen', maxchainlen)

   915     supportedformats = {

   922     supportedformats = {

   916         'revlogv1',

   923         'revlogv1',

   917         'generaldelta',

   924         'generaldelta',

   918         'treemanifest',

   925         'treemanifest',

   919         REVLOGV2_REQUIREMENT,

   926         REVLOGV2_REQUIREMENT,

   920         SPARSEREVLOG_REQUIREMENT,

   928         SPARSEREVLOG_REQUIREMENT,

   921         bookmarks.BOOKMARKS_IN_STORE_REQUIREMENT,

   929         bookmarks.BOOKMARKS_IN_STORE_REQUIREMENT,

   922     }

   930     }

   923     _basesupported = supportedformats | {

   931     _basesupported = supportedformats | {

   924         'store',

   932         'store',

  3151 

  3159 

  3152     if scmutil.gdinitconfig(ui):

  3160     if scmutil.gdinitconfig(ui):

  3153         requirements.add('generaldelta')

  3161         requirements.add('generaldelta')

  3154         if ui.configbool('format', 'sparse-revlog'):

  3162         if ui.configbool('format', 'sparse-revlog'):

  3155             requirements.add(SPARSEREVLOG_REQUIREMENT)

  3163             requirements.add(SPARSEREVLOG_REQUIREMENT)

  3156     if ui.configbool('experimental', 'treemanifest'):

  3168     if ui.configbool('experimental', 'treemanifest'):

  3157         requirements.add('treemanifest')

  3169         requirements.add('treemanifest')

  3158 

  3170 

  3159     revlogv2 = ui.config('experimental', 'revlogv2')

  3171     revlogv2 = ui.config('experimental', 'revlogv2')

  3160     if revlogv2 == 'enable-unstable-format-and-corrupt-my-data':

  3172     if revlogv2 == 'enable-unstable-format-and-corrupt-my-data':