2 

     3   $ hg init requirements

     4   $ cd requirements

     5 

     6 # LFS not loaded by default.

     7 

     8   $ hg config extensions

     9   [1]

    10 

    11 # Adding lfs to requires file will auto-load lfs extension.

    12 

    13   $ echo lfs >> .hg/requires

    14   $ hg config extensions

    15   extensions.lfs=

    16 

    17 # But only if there is no config entry for the extension already.

    18 

    19   $ cat > .hg/hgrc << EOF

    20   > [extensions]

    21   > lfs=!

    22   > EOF

    23 

    24   $ hg config extensions

    25   abort: repository requires features unknown to this Mercurial: lfs!

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

    27   [255]

    28 

    29   $ cat > .hg/hgrc << EOF

    30   > [extensions]

    31   > lfs=

    32   > EOF

    33 

    34   $ hg config extensions

    35   extensions.lfs=

    36 

    37   $ cat > .hg/hgrc << EOF

    38   > [extensions]

    39   > lfs = missing.py

    40   > EOF

    41 

    42   $ hg config extensions

    43   *** failed to import extension lfs from missing.py: [Errno 2] $ENOENT$: 'missing.py'

    44   abort: repository requires features unknown to this Mercurial: lfs!

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

    46   [255]

    47 

    48   $ cd ..