scripts/nixops: Switch to using SSH.invoke_shell.

We now should have a ssh subcommand which works the same way as the
ssh-for-each subcommand, except that it doesn't rely on a SSH master
socket to be present.

This not only has the benefits of making the codebase more DRY but also
things like ssh into a machine that's in rescue mode now work properly.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

scripts/nixops

@@ -504,11 +504,7 @@ def op_ssh():
     (username, machine) = parse_machine(args.machine)
     m = depl.machines.get(machine)
     if not m: raise Exception("unknown machine ‘{0}’".format(machine))
-    ssh_name = m.get_ssh_name()
-    if args.debug:
-        print >> sys.stderr, "connecting to {0}...".format(ssh_name)
-    res = subprocess.call(["ssh", username + "@" + ssh_name] + m.get_ssh_flags() + args.args)
-    sys.exit(res)
+    sys.exit(m.ssh.invoke_shell(['-l', username] + args.args))
 
 
 def op_ssh_for_each():