caches: invalidate store caches when lock is taken
The fncache was not being properly invalidated each time the lock was taken, so
in theory it could contain old data from prior to the caller having the lock.
This changes it to be invalidated as soon as the lock is taken (same as all our
other caches).
$ "$TESTDIR/hghave" pyflakes || exit 80
$ cd "`dirname "$TESTDIR"`"
run pyflakes on all tracked files ending in .py or without a file ending
(skipping binary file random-seed)
$ hg manifest 2>/dev/null | egrep "\.py$|^[^.]*$" | grep -v /random_seed$ \
> | xargs pyflakes 2>/dev/null | "$TESTDIR/filterpyflakes.py"
contrib/win32/hgwebdir_wsgi.py:*: 'win32traceutil' imported but unused (glob)
setup.py:*: 'sha' imported but unused (glob)
setup.py:*: 'zlib' imported but unused (glob)
setup.py:*: 'bz2' imported but unused (glob)
setup.py:*: 'py2exe' imported but unused (glob)
tests/hghave.py:*: '_lsprof' imported but unused (glob)
tests/hghave.py:*: 'publish_cmdline' imported but unused (glob)
tests/hghave.py:*: 'pygments' imported but unused (glob)
tests/hghave.py:*: 'ssl' imported but unused (glob)
contrib/win32/hgwebdir_wsgi.py:93: 'from isapi.install import *' used; unable to detect undefined names (glob)