Kubernetes Service/Ingress API evolution

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Note: Please refrain from using this project. Instead, please refer to the upstream repository. Thank you!

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This project is a fork of the upstream, Kubernetes Service APIs project for the sole purpose of the support/pacific branch that defines the following schema versions for the Service APIs:

Schema Version	Commit	Package
v1alpha0	917c67fb9089	github.com/vmware-tanzu/service-apis/api/v1alpha0
v1alpha1pre1	11f91778099d	github.com/vmware-tanzu/service-apis/api/v1alpha1pre1

Supporting v1alpha0 and v1alpha1pre1

While it is possible to use the support/pacific branch to have access to Go types that support both schemas, the CRDs themselves are a different story.

An older version of TcpRoute is incompatible with newer versions of TCPRoute. The two names use different casing, and a Kubernetes CRD's Kind field is:

• Case insensitive
• Immutable between versions

Since the original TcpRoute was a skeleton type anyway, and not used for anything, this just means that in preparation to applying the new CRDs, the following command must be executed against the cluster against which the CRDs are to be applied:

kubectl delete CustomResourceDefinition tcproutes.networking.x-k8s.io

This will remove the v1alpha0 version of the TcpRoute and safely allow the new TCPRoute CRD to be installed.

Again, this is not an issue because the older TcpRoute is:

• A skeleton type without any real fields
• Not used or implemented by anyone

Creating the Support Branch

This section describes how the support branch was created for schema versions v1alpha0 and v1alpha1pre1:

v1alpha0

The v1alpha0 schema was created by:

1. Creating a branch from the upstream repository at commit 917c67fb9089
2. Finding and replacing all instances of v1alpha1 with v1alpha0
3. Renaming the Go module from sigs.k8s.io/service-apis to github.com/vmware-tanzu/service-apis
4. Re-running the generator code to ensure all the protobufs were updated

These changes enable someone use the following resources at schema version v1alpha0:

• gatewayclass.networking.x-k8s.io
• gateway.networking.x-k8s.io
• httproute.networking.x-k8s.io
• trafficsplit.networking.x-k8s.io
• tcproute.networking.x-k8s.io

v1alpha1pre1

The v1alpha1pre1 schema was created by:

1. Renaming the support/v1alpha0 branch to support/pacific:

   git branch -m support/v1alpha0 support/pacific

2. Creating a branch temp1 at commit 11f91778099d:

   git checkout -b temp1 11f91778099d6720ddc066ddcde327fa6216aec0

3. Reading just the desired directory, and the commits responsible for its contents, from commit the 11f91778099d into branch temp2:

   git subtree split --prefix=apis/v1alpha1 -b temp2

4. Checking out branch support/pacific:

   git checkout support/pacific

5. Reading the contents, and commtis responsible for the contents, from the split branch, temp2, into the api/v1alpha1pre1 directory of the support/pacific branch:

   git subtree add --prefix=api/v1alpha1pre1 temp2

6. Finding and replacing all instances of v1alpha1 with v1alpha1pre1

7. Re-running the generator code to ensure all the protobufs were updated

These changes enable someone use the following resources at schema version v1alpha1pre1:

• gatewayclass.networking.x-k8s.io
• gateway.networking.x-k8s.io
• httproute.networking.x-k8s.io
• tcproute.networking.x-k8s.io