D6474: tests: show how the dirstate can end up containing wrong information

[valentin.gatienbaron (Valentin Gatien-Baron)]

Closed by commit rHGd9a50456ea3d: tests: show how the dirstate can end up containing wrong information (authored by valentin.gatienbaron).
This revision was automatically updated to reflect the committed changes.
This revision was not accepted when it landed; it landed in state "Needs Review".

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST UPDATE
  https://phab.mercurial-scm.org/D6474?vs=15461&id=15488

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D6474/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D6474

AFFECTED FILES
  tests/test-dirstate-race2.t

CHANGE DETAILS

diff --git a/tests/test-dirstate-race2.t b/tests/test-dirstate-race2.t
new file mode 100644
--- /dev/null
+++ b/tests/test-dirstate-race2.t
@@ -0,0 +1,39 @@
+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. It results in a corrupted dirstate, which
+stores the wrong size, and thus hg status shows spuriously modified
+files.
+
+  $ 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          0 (set  |unset)               a (re)
+  $ echo a > a; hg status; hg diff
+  M a



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