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This document describes the policy for updating Curtin in a stable, supported release. Curtin (the curt installer) is a "fast path" installer designed to install Ubuntu quickly. It is blunt, brief, snappish, snippety and unceremonious. In order to closely align with the MAAS product, curtin needs to be periodically updated in order to enable new features. Therefore, the following types of changes are allowed as long as the conditions outlined below are met:

• Bug fixes
• New features
• Changes to existing features

In the event of a change breaking backwards compatibility, then SRU team approval will need to be obtained.

Requesting the SRU

The SRU should be done with a single process bug, instead of individual bug reports for individual bug fixes. The one bug should have the following:

• The SRU should be requested per the StableReleaseUpdates documented process

• The template at the end of this document should be used and all ‘TODO’ filled out
• References to each bug fixed by the SRU should be included in the changelog and major changes called out in the SRU template, especially where changed behavior is not backwards compatible.
• For each release (e.g. trusty, xenial, etc.) that is proposed to be updated by the SRU a link to the results of integration testing, via Curtin’s vmtest, successfully completed using the proposed package with no unexplained errors or failures
• Any architecture specific fixes need to be noted and architecture specific test results included
• Any packaging changes (e.g. a dependency changes) need to be stated
• If any manual testing occurs it should also be documented. See LP# 1588052 as an example.

QA Process

Merges

Updates to curtin trunk go through the following process:

• Reviewed and approved by a member of the development team
• Daily integration tests on trunk
• Successful run of unit tests and style tests based on the bzr branch
• Branch set to the committed state

Packaging

The following describes the requirements for each package generated for the SRU.

For each package generated a successful completion of Curtin’s integration tests, as described below, using the proposed package with no unexplained errors or failures

Integration Tests

Curtin includes an in-tree integration suite to validating various forms of custom storage and network configurations. The tests themselves involve over a hundred installs with a variety of configurations to touch as many features and functionalities as possible including tests to cover previous opened bugs. Test installs are done for all of the supported releases, including Ubuntu LTS releases as well as currently supported interim releases.

SRU Template

== Begin SRU Template ==
[Impact]
This release sports both bug-fixes and new features and we would like to
make sure all of our supported customers have access to these improvements.
The notable ones are:

   * <TODO: Create list with LP: # included>

See the changelog entry below for a full list of changes and bugs.

[Test Case]
The following development and SRU process was followed:
https://wiki.ubuntu.com/CurtinUpdates

Curtin now contains an extensive integration test suite that is ran using
the SRU package for each releases. These suite has documentation here:
https://curtin.readthedocs.io/en/latest/topics/integration-testing.html

[Regression Potential]
In order to mitigate the regression potential, the results of the
aforementioned integration tests are attached to this bug.

<TODO: attach test artifacts from vmtest for every SRU release, not a link>

[Discussion]
<TODO: other background>

== End SRU Template ==

<TODO: Paste in change log entry>