node: add 'nullhex', hex-encoded nullid
We're going to need this for upcoming changes, because the merge state stores
nodes as hex strings.
from mercurial import util
def makedate():
return 0, 0
def getuser():
return 'bob'
# mock the date and user apis so the output is always the same
def uisetup(ui):
util.makedate = makedate
util.getuser = getuser