$ hg init repo

  $ cd repo

  $ echo test > b

  $ mkdir dir1

  $ echo test > dir1/c

  $ echo test > d

  $ echo test > e

#if execbit

A directory will typically have the execute bit -- make sure it doesn't get

confused with a file with the exec bit set

  $ chmod +x e

#endif

  $ hg add b dir1 d e

  adding dir1/c

  $ hg commit -m test2

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

  > from mercurial import (

  >     context,

  >     extensions,

  > )

  > def extsetup():

  >     extensions.wrapfunction(context.workingctx, '_checklookup', overridechecklookup)

  > def overridechecklookup(orig, self, files):

  >     # make an update that changes the dirstate from underneath

  >     self._repo.ui.system(self._repo.ui.config('dirstaterace', 'command'), cwd=self._repo.root)

  >     return orig(self, files)

  > EOF

  $ hg debugrebuilddirstate

  $ hg debugdirstate

  n   0         -1 unset               a

  n   0         -1 unset               b

  n   0         -1 unset               d

  n   0         -1 unset               dir1/c

  n   0         -1 unset               e

XXX Note that this returns M for files that got replaced by directories. This is

definitely a bug, but the fix for that is hard and the next status run is fine

anyway.

  $ hg status --config extensions.dirstaterace=$TESTTMP/dirstaterace.py \

  >   --config dirstaterace.command='rm b && rm -r dir1 && rm d && mkdir d && rm e && mkdir e'

  M d

  M e

  ! b

  ! dir1/c

  $ hg debugdirstate

  n 644          2 * a (glob)

  n   0         -1 unset               b

  n   0         -1 unset               d

  n   0         -1 unset               dir1/c

  n   0         -1 unset               e

  $ hg status

  ! b

  ! d

  ! dir1/c

  ! e