view tests/notcapable @ 51352:7083b33a2699

delta-find: explicitly deal with usage of the cached revision

We can remove this from the general logic path and directly deal with this
corner case early.

This result in a small change in test-generaldelta.t as it turns out that:

- at commit time we (sometimes) precompute a delta against p1 and pass it as the
  cached delta.
- since cached delta where going through the same filtering as everything, we
  could "optimize" the base if it applied to an empty delta, resulting in not
  using the pre-computed delta.

The simpler logic fix the second item, making the cached delta base always actually
tested when requested.

Note that the computation of a fast delta against p1 only is questionable, but
looking into that is out of scope for this series.

# Disable the $CAP wire protocol capability.

if test -z "$CAP"
then
    echo "CAP environment variable not set."
fi

cat > notcapable-$CAP.py << EOF
from mercurial import extensions, localrepo
from mercurial.interfaces import repository
def extsetup(ui):
    extensions.wrapfunction(repository.peer, 'capable', wrapcapable)
    extensions.wrapfunction(localrepo.localrepository, 'peer', wrappeer)
def wrapcapable(orig, self, name, *args, **kwargs):
    if name in b'$CAP'.split(b' '):
        return False
    return orig(self, name, *args, **kwargs)
def wrappeer(orig, self, *args, **kwargs):
    # Since we're disabling some newer features, we need to make sure local
    # repos add in the legacy features again.
    return localrepo.locallegacypeer(self, *args, **kwargs)
EOF

echo '[extensions]' >> $HGRCPATH
echo "notcapable-$CAP = `pwd`/notcapable-$CAP.py" >> $HGRCPATH