diskimage-builder/elements/ubuntu-minimal
Gregory Haynes 45df304d48 Perform package install outside of debootstrap
Debootstrap only supports one apt repository to install packages from.
As a result, we do not consider the updates repo during debootstrap
causing us install a second kernel when we do an apt-get dist-upgrade
during build.

Lets use debootstrap to get us a minimal chroot, then add our repos and
install the correct packages from the start.

We also have to reorder the dpkg root.d scripts which configure apt so
they run before we perform our package installs.

Change-Id: I6a592db6f0a01d3b19d8e0786e63f1315a1ef647
Closes-Bug: #1637516
2016-11-30 15:16:46 +11:00
..
environment.d Split the debootstrap functions into an element 2015-04-26 18:04:59 +00:00
pre-install.d Split the debootstrap functions into an element 2015-04-26 18:04:59 +00:00
root.d Perform package install outside of debootstrap 2016-11-30 15:16:46 +11:00
test-elements/build-succeeds Add tests for building *-minimal images 2016-08-22 16:53:32 +00:00
element-deps Perform package install outside of debootstrap 2016-11-30 15:16:46 +11:00
element-provides Add minimal ubuntu and centos base elements 2014-12-11 13:27:36 -08:00
package-installs.yaml Perform package install outside of debootstrap 2016-11-30 15:16:46 +11:00
README.rst Explain difference between two envvars 2016-08-25 10:07:29 +08:00

==============
ubuntu-minimal
==============

Note: The ubuntu element is likely what you want unless you really know
you want this one for some reason. The ubuntu element gets a lot more testing
coverage and use.

Create a minimal image based on Ubuntu. We default to trusty but DIB_RELEASE
is mapped to any series of Ubuntu.

If necessary, a custom apt keyring and debootstrap script can be
supplied to the `debootstrap` command via `DIB_APT_KEYRING` and
`DIB_DEBIAN_DEBOOTSTRAP_SCRIPT` respectively. Both options require the
use of absolute rather than relative paths.

Use of this element will also require the tool 'debootstrap' to be
available on your system. It should be available on Ubuntu, Debian,
and Fedora.

The `DIB_OFFLINE` or more specific `DIB_DEBIAN_USE_DEBOOTSTRAP_CACHE`
variables can be set to prefer the use of a pre-cached root filesystem
tarball.

The `DIB_DEBOOTSTRAP_EXTRA_ARGS` environment variable may be used to
pass extra arguments to the debootstrap command used to create the
base filesystem image. If --keyring is is used in `DIB_DEBOOTSTRAP_EXTRA_ARGS`,
it will override `DIB_APT_KEYRING` if that is used as well.

For further information about `DIB_DEBIAN_DEBOOTSTRAP_SCRIPT`,
`DIB_DEBIAN_USE_DEBOOTSTRAP_CACHE` and `DIB_DEBOOTSTRAP_EXTRA_ARGS`
please consult "README.rst" of the debootstrap element.