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