Comment 5 for bug 1315060

Discussed with slangasek who brought up a good point: it probably makes sense to introduce a '--append-confdir' or '--add-confdir' since that would:

a) Make it more difficult to make a device unbootable (with only --confdir, if you forget to add '--confdir /etc/init/', your device will likely not boot).

b) Minimise the required kernel command-line changes.