1 A new repository uses zlib storage, which doesn't need a requirement

     2 

     3   $ hg init default

     4   $ cd default

     5   $ cat .hg/requires

     6   dotencode

     7   fncache

     8   generaldelta

     9   revlogv1

    10   store

    11 

    12   $ touch foo

    13   $ hg -q commit -A -m 'initial commit with a lot of repeated repeated repeated text to trigger compression'

    14   $ hg debugrevlog -c | grep 0x78

    15       0x78 (x)  :   1 (100.00%)

    16       0x78 (x)  : 110 (100.00%)

    17 

    18   $ cd ..

    19 

    20 Unknown compression engine to format.compression aborts

    21 

    22   $ hg --config experimental.format.compression=unknown init unknown

    23   abort: compression engine unknown defined by experimental.format.compression not available

    24   (run "hg debuginstall" to list available compression engines)

    25   [255]

    26 

    27 A requirement specifying an unknown compression engine results in bail

    28 

    29   $ hg init unknownrequirement

    30   $ cd unknownrequirement

    31   $ echo exp-compression-unknown >> .hg/requires

    32   $ hg log

    33   abort: repository requires features unknown to this Mercurial: exp-compression-unknown!

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

    35   [255]

    36 

    37   $ cd ..

    38 

    39 #if zstd

    40 

    41   $ hg --config experimental.format.compression=zstd init zstd

    42   $ cd zstd

    43   $ cat .hg/requires

    44   dotencode

    45   exp-compression-zstd

    46   fncache

    47   generaldelta

    48   revlogv1

    49   store

    50 

    51   $ touch foo

    52   $ hg -q commit -A -m 'initial commit with a lot of repeated repeated repeated text'

    53 

    54   $ hg debugrevlog -c | grep 0x28

    55       0x28      :  1 (100.00%)

    56       0x28      : 98 (100.00%)

    57 

    58   $ cd ..

    59 

    60 Specifying a new format.compression on an existing repo won't introduce data

    61 with that engine or a requirement

    62 

    63   $ cd default

    64   $ touch bar

    65   $ hg --config experimental.format.compression=zstd -q commit -A -m 'add bar with a lot of repeated repeated repeated text'

    66 

    67   $ cat .hg/requires

    68   dotencode

    69   fncache

    70   generaldelta

    71   revlogv1

    72   store

    73 

    74   $ hg debugrevlog -c | grep 0x78

    75       0x78 (x)  :   2 (100.00%)

    76       0x78 (x)  : 199 (100.00%)

    77 

    78 #endif