Implement Crossplane Service Provider

[In-Ko]

Understand the Task

Description
Implement a new service provider for Crossplane, based on the MCP Architecture V2.
The Crossplane Service Provider (CSP) should be able to make Crossplane and the usage of arbitrary Crossplane providers available to the MCP users.

https://github.com/openmcp-project/service-provider-crossplane

To accomplish this, a part of the Crossplane Package Manager has to be reimplemented to configure the provider operators to manage the MCP when running on external clusters. This custom package manager ("crossplane-pkg") will have it's own github repository.

Any further valuable resources.

Repositories for both operators (service-provider-crossplane and crossplane-pkg) are still on the internal GH instance.

What is required to accept the Task as done.

Implementation

• The service-provider-crossplane manages a new "Crossplane" instance resource
• It creates a new namespace in its worker cluster
• Installs Crossplane (core and rbac-manager) in the new namespace with the native package manager disabled, and configured to see the MCP instead of the local cluster
• Installs the custom crossplane-pkg controller that is configured to install the provider deployments in the local cluster and configures them to see the MCP instead of the local cluster
• Create a repository for crossplane-pkg
• Configure RBAC for crossplane-pkg and define RBAC needed by service-provider-crossplane itself
• crossplane-pkg removes the provider deployments and other resources on deletion
• Configure webhooks for the providers
• Initialize Pipeline
• Write tests

Done Criteria

• Finish implementation
• Code has been reviewed by other team members
• Internal technical Documentation created/updated
• New / changed code is documented
• Unit Tests created for new code or existing Unit Tests updated
• Integration Test Suite updated
• Enduser Documentation updated (if applicable)
• Successful demonstration in Review

[dattito]

I'll slow down the further development for now to focus on writing my bachelor thesis

[dattito]

TBD: Should .spec.kubeconfigRef get a namespace and a key attribute?

[In-Ko]

Wonder how we go about this tasks now: @dattito not being available for 3 weeks or so.
Suggestion @ValentinGerlach ?

[dattito]

After my vacation I also only have about one week left before I return to university...

I am on vacation until 21.04.

[In-Ko]

As discussed today with @dattito:

• We need to keep a list of features / issues in here, so that others will be able to take over development of this Provider
• We also need a bit of technical documentation, so that others taking over will have an easier start

[dattito]

• Added some more information to the READMEs of the repos
• List in the description of this issue is up to date
• Handover done with @reshnm

From next week I will be back in university until mid of August. But if there are any questions, do not hesitate to contact me!

[In-Ko]

Moved to "on hold" for now, since the team needs to focus on other parts or V2, to get a first integration scenarios working. Later, we will also integrate the Crossplane Service provider.

[In-Ko]

Still on hold, we will use the V1 and carve it out as a separate service provider. The real V2 will be done later, based on this initial version.