Linuxism in "hg clone"? Does not work on NetBSD

[Stephane Bortzmeyer]

% hg clone /var/tmp/One    
cp: unknown option -- a

This is probably because, in mercurial/commands.py, there is:

    if other.dev() != -1 and os.stat(dest).st_dev == other.dev():
        ui.note("cloning by hardlink\n")
        util.system("cp -al '%s'/.hg '%s'/.hg" % (source, dest))

But -a is not standard, it is specific to GNU fileutils (Linux's cp
comes from it but not NetBSD's cp).

Mercurial 0.6b, NetBSD 2.0.1