$ rmdir d e

  $ hg update -C -q .

Test that dirstate changes aren't written out at the end of "hg

status", if .hg/dirstate is already changed simultaneously before

acquisition of wlock in workingctx._checklookup().

This avoidance is important to keep consistency of dirstate in race

condition (see issue5584 for detail).

  $ hg parents -q

  1:* (glob)

  $ 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

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

  > # This script assumes timetable of typical issue5584 case below:

  > #

  > # 1. "hg status" loads .hg/dirstate

  > # 2. "hg status" confirms clean-ness of FILE

  > # 3. "hg update -C 0" updates the working directory simultaneously

  > #    (FILE is removed, and FILE is dropped from .hg/dirstate)

  > # 4. "hg status" acquires wlock

  > #    (.hg/dirstate is re-loaded = no FILE entry in dirstate)

  > # 5. "hg status" marks FILE in dirstate as clean

  > #    (FILE entry is added to in-memory dirstate)

  > # 6. "hg status" writes dirstate changes into .hg/dirstate

  > #    (FILE entry is written into .hg/dirstate)

  > #

  > # To reproduce similar situation easily and certainly, #2 and #3

  > # are swapped.  "hg cat" below ensures #2 on "hg status" side.

  > 

  > hg update -q -C 0

  > hg cat -r 1 b > b

  > EOF

"hg status" below should excludes "e", of which exec flag is set, for

portability of test scenario, because unsure but missing "e" is

treated differently in _checklookup() according to runtime platform.

- "missing(!)" on POSIX, "pctx[f].cmp(self[f])" raises ENOENT

- "modified(M)" on Windows, "self.flags(f) != pctx.flags(f)" is True

  $ hg status --config extensions.dirstaterace=$TESTTMP/dirstaterace.py --debug -X path:e

  skip updating dirstate: identity mismatch

  M a

  ! d

  ! dir1/c

  $ hg parents -q

  0:* (glob)

  $ hg files

  a

  $ hg debugdirstate

  n * * * a (glob)