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Test file dedicated to checking side-data related behavior

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Check data can be written/read from sidedata

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  $ cat << EOF >> $HGRCPATH

  > [extensions]

  > testsidedata=$TESTDIR/testlib/ext-sidedata.py

  > EOF

  $ hg init test-sidedata --config experimental.revlogv2=enable-unstable-format-and-corrupt-my-data

  $ cd test-sidedata

  $ echo aaa > a

  $ hg add a

  $ hg commit -m a --traceback

  $ echo aaa > b

  $ hg add b

  $ hg commit -m b

  $ echo xxx >> a

  $ hg commit -m aa

  $ hg debugsidedata -c 0

  2 sidedata entries

   entry-0001 size 4

   entry-0002 size 32

  $ hg debugsidedata -c 1 -v

  2 sidedata entries

   entry-0001 size 4

    '\x00\x00\x006'

   entry-0002 size 32

    '\x98\t\xf9\xc4v\xf0\xc5P\x90\xf7wRf\xe8\xe27e\xfc\xc1\x93\xa4\x96\xd0\x1d\x97\xaaG\x1d\xd7t\xfa\xde'

  $ hg debugsidedata -m 2

  2 sidedata entries

   entry-0001 size 4

   entry-0002 size 32

  $ hg debugsidedata a  1

  2 sidedata entries

   entry-0001 size 4

   entry-0002 size 32

Check upgrade behavior

======================

Right now, sidedata has not upgrade support

Check that we can upgrade to sidedata

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  $ hg init up-no-side-data --config experimental.revlogv2=no

  $ hg debugformat -v -R up-no-side-data | egrep 'changelog-v2|revlog-v2'

  revlog-v2:           no     no      no

  changelog-v2:        no     no      no

  $ hg debugformat -v -R up-no-side-data --config experimental.revlogv2=enable-unstable-format-and-corrupt-my-data | egrep 'changelog-v2|revlog-v2'

  revlog-v2:           no    yes      no

  changelog-v2:        no     no      no

  $ hg debugupgraderepo -R up-no-side-data --config experimental.revlogv2=enable-unstable-format-and-corrupt-my-data > /dev/null

Check that we can downgrade from sidedata

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  $ hg init up-side-data --config experimental.revlogv2=enable-unstable-format-and-corrupt-my-data

  $ hg debugformat -v -R up-side-data | egrep 'changelog-v2|revlog-v2'

  revlog-v2:          yes     no      no

  changelog-v2:        no     no      no

  $ hg debugformat -v -R up-side-data --config experimental.revlogv2=no | egrep 'changelog-v2|revlog-v2'

  revlog-v2:          yes     no      no

  changelog-v2:        no     no      no

  $ hg debugupgraderepo -R up-side-data --config experimental.revlogv2=no > /dev/null