bc378d091b
The code in Keg.self.for path uses "path = path.parent.realpath" to walk up subfolders looking for a Keg. Because 'realpath' is in there, and the path is checked against HOMEBREW_CELLAR, which may be a symlink, we need to do realpath-to-realpath comparisons in Keg. Otherwise, we will hit equivalent but symlinked folders, not see that they are the same, and walk all the way up to / and then error out.