[PATCH 1/3] atomic-revprop: Change error name

Hi,

I'm keen to get the atomic-revprop feature working, so I've had a
go at writing patches for some of the missing bits.

This first patch gives a unique error code for the case where the
old_value passed to the revprop change function doesn't match the
real old value. This allows it to be detected easily. (The
branch currently overloads SVN_ERR_BAD_PROPERTY_VALUE for this,
but the same error code is also used if the new value is illegal).

This feature is on the BRANCH-README's TODO list.

The patch is against the atomic-revprop branch, but it also
applies to trunk.

[[[
Use a new, distinct error code if svn_fs_change_rev_prop2's old_value_p
doesn't match.

* subversion/include/svn_error_codes.h:
  (SVN_ERR_BAD_OLD_VALUE): New error code.

* subversion/libsvn_fs_fs/fs_fs.c:
  (change_rev_prop_body): Use SVN_ERR_BAD_OLD_VALUE when appropriate.

* subversion/libsvn_fs_base/revs-txns.c:
  (svn_fs_base__set_rev_prop): Use SVN_ERR_BAD_OLD_VALUE when
appropriate.

* subversion/include/svn_fs.h:
  (svn_fs_change_rev_prop2): Update documentation.

* subversion/tests/libsvn_fs/fs-test.c:
  (FAILS_WITH_BPV): Rename to...
  (FAILS_WITH_BOV): ... this. Change to test for SVN_ERR_BAD_OLD_VALUE.
  (revision_props): Change to use FAILS_WITH_BOV instead of
FAILS_WITH_BPV.

Patch by: Jon Foster <jon.foster_at_cabot.co.uk>
]]]

Kind regards,

Jon

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