Add support for supplying a custom keyring and debootstrap script
using two new environment variables:
* DIB_DEBIAN_KEYRING - Path to a gpg keyring.
* DIB_DEBIAN_DEBOOTSTRAP_SCRIPT - Path to a alternative debootstrap
script.
Change-Id: I42e8832b435b8a77b0681b5bc9d9332bbe860cd5
DIB_OFFLINE has wide-ranging effect. This patch adds a tunable that
only turns on the tarball-caching behaviour specifically for the
debian element.
Change-Id: Idd646d7909df6907afc0eeeec1129c3f1a1f92bc
The ubuntu element supports simple replacement of sources.list by using
the DIB_DISTRIBUTION_MIRROR environment variable. Drag the debian
element into line by supporting both DIB_DEBIAN_MIRROR and the new shiny
DIB_DISTRIBUTION_MIRROR.
Change-Id: I9d5f8d1e3251965b34e55929182aa601a524fe8f
