tests/notcapable

test-bundle2: add obsolescence information to be exchanged

To introduce a bundle2 way to exchange obsolescence markers, we need to
have some information available to exchange. Introduce markers relevant
to changesets involved in the exchange. The new markers reference the
changesets as successor nodes of clowny (nonexistent) hashes so that
other than being exchanged they have no effect.

We introduce them in two waves as push is expected to be smart about the
number of markers it exchanges sooner than pull.

# Disable the $CAP wire protocol capability.

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

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

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