Ian Wienand c47ee6e121 ubuntu: Add options to ignore mirror components and use insecure repos

When using the upstream cloud images with the "ubuntu" element, they
have universe and multiverse enabled which we don't mirror.

To use the infra mirrors as a DIB_DISTRIBUTION_MIRROR with this
element, we need to be able to skip redirecting to universe and
multiverse, and additionally enable insecure repos (as we don't gpg
sign our mirrors).

Add and document two new variables with the ubuntu element to do this.
This is then setup by the openstack-ci-mirrors element so that we use
local mirrors duing dib functional testing for the "ubuntu" element.

Change-Id: I6ffbde07fa0e103641ee5c5f9d9e854e5b2168dc

2018-10-18 13:53:48 +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.

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ubuntu

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