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Releasing knative/pkg

We release the components of Knative every 6 weeks. All of these components must be moved to the latest "release" of the knative/pkg shared library prior to each release, but likely this should happen incrementally over each milestone.

Release Process.

Step #1: Monday the week prior to each release.

On Monday of the week prior to the Knative release, each of the downstream repositories should stage a [WIP] Pull Request that advances the knative/pkg dependency to the latest commit.

At present, these downstream repositories include:

knative/serving
knative/eventing
knative/eventing-contrib
knative/sample-controller
google/knative-gcp

The automation that auto-bumps these lives here.

Gopkg.toml should look like:

[[override]]
  name = "knative.dev/pkg"
  branch = "master"

Then the following is run:

dep ensure -update knative.dev/pkg
./hack/update-codegen.sh

If problems are found, they are addressed and the update is merged, and this process repeats until knative/pkg can be cleanly updated without any changes.

If by mid-week, we do not have a clean PR in each repository, the person driving the update should escalate to avoid delaying the release.

Step #2: Friday the week prior to each release.

A release branch is snapped on knative/pkg with the form release-0.X where X reflects the forthcoming Knative release. The commit at which this branch is snapped will be the version that has been staged into [WIP] PRs in every repository.

These staging PRs are then updated to:

[[override]]
  name = "knative.dev/pkg"
  # The 0.X release branch.
  branch = "release-0.X"

The [WIP] is removed, and the PRs are reviewed and merged.

Backporting Fixes

If a problem is found in knative/pkg in an older release and a fix must be backported then it should first be fixed at HEAD (if still relevant). It should be called out and likely discussed (with a lead) in the original PR whether the fix is desired and eligible for back-porting to a release branch. This may raise the review bar, or lead to trade-offs in design; it is better to front-load this consideration to avoid delaying a cherry-pick.

Once that PR has merged (if still relevant), the same commit should be cherry-picked onto release-0.Y and any merge problems fixed up.

Once the change is ready, a PR should be sent against release-0.Y with the prefix [RELEASE-0.Y] Your PR Title to clearly designate this PR as targeting the release branch. A lead will review and make a ruling on the PR, but if this consideration was front-loaded, it should be a short review.

Picking up fixes

Downstream repositories should reference knative/pkg release branches from their own release branches, so to update the knative/pkg dependency we run:

dep ensure -update knative.dev/pkg
./hack/update-deps.sh

Revert to Master

Post release, reverse the process. Gopkg.toml should look like:

[[override]]
  name = "knative.dev/pkg"
  branch = "master"

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