Re: [PATCH] checkout-index needs a working tree

Hmmph. I was trying to come up with a better commit log message for this change.

	Paths given from the command line of checkout-index name
	files relative to the cwd, whose implication is that it
	is relative to where you are in relation with the top of
	the working tree.  For doing that, you need to have the
	work tree to begin with.

Does this mean that any command that uses its prefix parameter to cmd_xxx() needs NEED_WORK_TREE?

I wonder if it would help us to catch similar breakages if we change git.c::run_command() so that we do not pass prefix (or pass a bogus pointer ((const char *)1)) for commands that do not ask for NEED_WORK_TREE.