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dirstate-v2: Change the on-disk format when the requirement is enabled...

dirstate-v2: Change the on-disk format when the requirement is enabled For now, the format is the same except with an additional marker at the start. This marker is redundant: for existing repositories it is `.hg/requires` that determines which format to use. For new repositories, it is the new `format.exp-dirstate-v2` config. There is no upgrade or downgrade so far. Most of the changes are about plumbing a boolean through layers of APIs to indicate which format should be used. Differential Revision: https://phab.mercurial-scm.org/D10719

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      #testcases dirstate-v1 dirstate-v1-tree

      #if dirstate-v1-tree

      #require rust

        $ echo '[experimental]' >> $HGRCPATH

        $ echo 'dirstate-tree.in-memory=1' >> $HGRCPATH

      #endif

      Checking the size/permissions/file-type of files stored in the

      dirstate after an update where the files are changed concurrently

      outside of hg's control.

        $ hg init repo

        $ cd repo

        $ echo a > a

        $ hg commit -qAm _

        $ echo aa > a

        $ hg commit -m _

        $ hg debugdirstate --no-dates

        n 644          3 (set  |unset)               a (re)

        $ cat >> $TESTTMP/dirstaterace.py << EOF

        > from mercurial import (

        >     extensions,

        >     merge,

        > )

        > def extsetup(ui):

        >     extensions.wrapfunction(merge, 'applyupdates', wrap)

        > def wrap(orig, *args, **kwargs):

        >     res = orig(*args, **kwargs)

        >     with open("a", "w"):

        >         pass # just truncate the file

        >     return res

        > EOF

      Do an update where file 'a' is changed between hg writing it to disk

      and hg writing the dirstate. The dirstate is correct nonetheless, and

      so hg status correctly shows a as clean.

        $ hg up -r 0 --config extensions.race=$TESTTMP/dirstaterace.py

        1 files updated, 0 files merged, 0 files removed, 0 files unresolved

        $ hg debugdirstate --no-dates

        n 644          2 (set  |unset)               a (re)

        $ echo a > a; hg status; hg diff

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				#testcases dirstate-v1 dirstate-v1-tree

				#if dirstate-v1-tree
				#require rust
				$ echo '[experimental]' >> $HGRCPATH
				$ echo 'dirstate-tree.in-memory=1' >> $HGRCPATH
				#endif

				Checking the size/permissions/file-type of files stored in the
				dirstate after an update where the files are changed concurrently
				outside of hg's control.

				$ hg init repo
				$ cd repo
				$ echo a > a
				$ hg commit -qAm _
				$ echo aa > a
				$ hg commit -m _

				$ hg debugdirstate --no-dates
				n 644 3 (set \|unset) a (re)

				$ cat >> $TESTTMP/dirstaterace.py << EOF
				> from mercurial import (
				> extensions,
				> merge,
				> )
				> def extsetup(ui):
				> extensions.wrapfunction(merge, 'applyupdates', wrap)
				> def wrap(orig, args, *kwargs):
				> res = orig(args, *kwargs)
				> with open("a", "w"):
				> pass # just truncate the file
				> return res
				> EOF

				Do an update where file 'a' is changed between hg writing it to disk
				and hg writing the dirstate. The dirstate is correct nonetheless, and
				so hg status correctly shows a as clean.

				$ hg up -r 0 --config extensions.race=$TESTTMP/dirstaterace.py
				1 files updated, 0 files merged, 0 files removed, 0 files unresolved
				$ hg debugdirstate --no-dates
				n 644 2 (set \|unset) a (re)
				$ echo a > a; hg status; hg diff