1 A repo with unknown revlogv2 requirement string cannot be opened

     2 

     3   $ hg init invalidreq

     4   $ cd invalidreq

     5   $ echo exp-revlogv2.unknown >> .hg/requires

     6   $ hg log

     7   abort: repository requires features unknown to this Mercurial: exp-revlogv2.unknown!

     8   (see https://mercurial-scm.org/wiki/MissingRequirement for more information)

     9   [255]

    10   $ cd ..

    11 

    12 Can create and open repo with revlog v2 requirement

    13 

    14   $ cat >> $HGRCPATH << EOF

    15   > [experimental]

    16   > revlogv2 = enable-unstable-format-and-corrupt-my-data

    17   > EOF

    18 

    19   $ hg init empty-repo

    20   $ cd empty-repo

    21   $ cat .hg/requires

    22   dotencode

    23   exp-revlogv2.0

    24   fncache

    25   store

    26 

    27   $ hg log

    28 

    29 Unknown flags to revlog are rejected

    30 

    31   >>> with open('.hg/store/00changelog.i', 'wb') as fh:

    32   ...     fh.write('\x00\x04\xde\xad')

    33 

    34   $ hg log

    35   abort: unknown flags (0x04) in version 57005 revlog 00changelog.i!

    36   [255]

    37 

    38   $ cd ..

    39 

    40 Writing a simple revlog v2 works

    41 

    42   $ hg init simple

    43   $ cd simple

    44   $ touch foo

    45   $ hg -q commit -A -m initial

    46 

    47   $ hg log

    48   changeset:   0:96ee1d7354c4

    49   tag:         tip

    50   user:        test

    51   date:        Thu Jan 01 00:00:00 1970 +0000

    52   summary:     initial

    53   

    54 Header written as expected (changelog always disables generaldelta)

    55 

    56   $ f --hexdump --bytes 4 .hg/store/00changelog.i

    57   .hg/store/00changelog.i:

    58   0000: 00 01 de ad                                     |....|

    59 

    60   $ f --hexdump --bytes 4 .hg/store/data/foo.i

    61   .hg/store/data/foo.i:

    62   0000: 00 03 de ad                                     |....|