f6ba2aeaf4
Using set -e in all of our scripts will prevent some subtle bugs from slipping in, and will allow us to enforce use of set -e with tooling. This change also adds -u and set -o pipefail in the less complex scripts where it is unlikely to cause problems. A follow-up change will enable those options in the complex scripts so that if it breaks something it can be reverted easily. Change-Id: I0ad358ccb98da7277a0ee2e9ce8fda98438675eb
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
- To use different mirrors rather than the default of archive.ubuntu.com and security.ubuntu.com, use the environment variable DIB_DISTRIBUTION_MIRROR