diskimage-builder/diskimage_builder/elements/ubuntu/README.rst
Ian Wienand d5fa64325f Revert "Allowing ubuntu element use local image"
This reverts commit 1f4fb1d7a5.

This unfortunately wasn't actually tested.  Because the image-based
tests run sequentially, a prior failure in the centos-8 job meant the
ubuntu job never ran.

This is failing with

 10-cache-ubuntu-tarball: line 28: DIB_LOCAL_IMAGE: unbound variable

There is also a seemingly unused variable DIB_IMAGE_LOCAL_FILE; I'm
not sure what this is doing.

For now revert, and it can be re-proposed with appropriate testing.

Change-Id: I0f3897c90dc863ee04c3295b9cb094f02d8658e3
2021-10-20 09:39:27 +11:00

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======
ubuntu
======
Use Ubuntu cloud images as the baseline for built disk images.
Overrides:
* To use a non-default URL for downloading base Ubuntu cloud images,
use the environment variable ``DIB_CLOUD_IMAGES``
* To download a non-default release of Ubuntu cloud images, use the
environment variable ``DIB_RELEASE``. This element will export the
``DIB_RELEASE`` variable.
* Use ``DIB_DISTRIBUTION_MIRROR`` to override the ``sources.list``
with an alternative mirror
* Setting ``DIB_DISTRIBUTION_MIRROR_UBUNTU_IGNORE`` to an
extended-regexp (i.e. the argument to the ``=~`` bash comparitor)
which, when matched, will *not* set that line to the
``DIB_DISTRIBUTION_MIRROR``. For example, if your local mirror
does not mirror the universe and multiverse components, set this to
``(universe|multiverse)``
* Setting ``DIB_DISTRIBUTION_MIRROR_UBUNTU_INSECURE`` updates apt
settings to allow insecure/unuthenticated repositories.
.. element_deps::