Add interlink.eu/mesh-network: disabled annotation to opt out of mesh networking per pod

[Copilot]

With fullMesh enabled globally, there is no way to exclude individual pods from mesh networking. All offloaded pods unconditionally get WireGuard/wstunnel setup regardless of whether they need it.

Changes

pkg/virtualkubelet/virtualkubelet.go

• Added annMeshNetworkDisabled = "interlink.eu/mesh-network" annotation constant
• Added isMeshNetworkingDisabled(pod) helper (case-insensitive "disabled" check)
• Gated the three p.config.Network.FullMesh call sites — createDummyPod, CreatePod, DeletePod — with && !isMeshNetworkingDisabled(pod) to skip WireGuard keypair generation, wstunnel infrastructure creation/cleanup, and pod-subnet annotation injection

Documentation

• Added interlink.eu/mesh-network entry to the Pod Annotations Reference (both current and v0.6.x versioned docs)
• Added a "Disabling Mesh Networking for Specific Pods" section to the Mesh Network Configuration guide (both doc trees)

Usage

metadata:
  annotations:
    interlink.eu/mesh-network: "disabled"

When this annotation is present, the pod is offloaded without any mesh networking setup. All pods without the annotation continue to follow the global fullMesh configuration.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Add an annotation to disable mesh networking for offloaded pods</issue_title>
<issue_description>### Description

Version 0.6.x supports, when enabled, a mesh networking mode that allows bidirectional communication between offloaded pods and services/pods running on the source k8s cluster.

Currently, all offloaded pods have mesh networking enabled by default. However, not all pods require this capability, and keeping mesh networking always enabled may introduce unnecessary complexity or overhead.

Problem

There is currently no way to:

• selectively disable mesh networking
• control this behavior at the level of individual offloaded pods

Proposal

Introduce a Kubernetes annotation that allows mesh networking to be disabled per pod.

Example (illustrative):

annotations:
  interlink.eu/mesh-network: "disabled"

Expected Behavior

• Default behavior remains unchanged (mesh networking enabled)
• If the annotation is present and set to disabled, the pod is offloaded without mesh networking
• Bidirectional communication is disabled only for pods that do not require it
  </issue_description>

<agent_instructions>follow the instructions and don't forget to document what is changed</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Add an annotation to disable mesh networking for offloaded pods #482

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[Copilot]

Pull request overview

Adds a per-pod opt-out annotation to skip mesh networking setup when FullMesh is enabled globally, and documents the new behavior.

Changes:

• Introduces interlink.eu/mesh-network: "disabled" annotation handling (isMeshNetworkingDisabled) and gates FullMesh-related setup/cleanup.
• Updates documentation (current + v0.6.x) to describe the new annotation and how to use it.
• Removes dependency declarations from the ci/ Go module (go.mod/go.sum).

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
pkg/virtualkubelet/virtualkubelet.go	Adds annotation constant + helper and gates FullMesh setup/cleanup paths.
docs/versioned_docs/version-0.6.x/guides/13-mesh-network-configuration.mdx	Documents per-pod mesh opt-out for v0.6.x.
docs/versioned_docs/version-0.6.x/guides/09-pod-annotations.mdx	Adds annotation reference entry for v0.6.x.
docs/docs/guides/13-mesh-network-configuration.mdx	Documents per-pod mesh opt-out in current docs.
docs/docs/guides/09-pod-annotations.mdx	Adds annotation reference entry in current docs.
ci/go.mod	Removes all require directives (leaves only replace).
ci/go.sum	Clears all checksums (file becomes empty).

Comments suppressed due to low confidence (1)

ci/go.mod:12

• ci/go.mod no longer has any require directives and ci/go.sum is now empty, but this module imports generated packages (/internal/dagger, /internal/querybuilder, /internal/telemetry) that are gitignored and typically bring in dependencies (e.g., GraphQL client + OTel). With this state, running dagger call/go build will likely need to modify go.mod/go.sum to add back requirements; in environments that use -mod=readonly (or workflows that verify module files), this can fail. Suggest regenerating the Dagger Go SDK files (e.g., dagger develop) and committing the resulting go.mod/go.sum from a go mod tidy, or otherwise keeping the required dependency set in version control.

module dagger/interlink

go 1.24.0

replace go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc => go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc v0.14.0

replace go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp => go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp v0.14.0

replace go.opentelemetry.io/otel/log => go.opentelemetry.io/otel/log v0.14.0

replace go.opentelemetry.io/otel/sdk/log => go.opentelemetry.io/otel/sdk/log v0.14.0

---

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[dciangot]

@Bianco95 i think we might want to make this into a new pre 0.6.1

[dciangot]

@copilot please check this pr, and be sure it compiles and passes lint. Also check for conflicts and be careful in do not discard fieatures that are already in main.

[Copilot]

@copilot please check this pr, and be sure it compiles and passes lint. Also check for conflicts and be careful in do not discard fieatures that are already in main.

Merged origin/main into this branch in 8aa45db. Conflicts resolved: the annMeshNetworkDisabled constant was combined with main's annDisableOffloadContainers/annDisableOffloadInitContainers additions, and the inlined WireGuard setup code was replaced with main's refactored setupWireGuardConfig call while preserving the !isMeshNetworkingDisabled(originalPod) guard. go build ./... and go vet ./... both pass. The only test failures (TestDoRequestWithClient) are pre-existing in origin/main — they're caused by a loopback URL being rejected by main's SSRF check unrelated to our changes.

[dciangot]

Thanks, @copilot please take the occasion to fix that test as well.

[Copilot]

Thanks, @copilot please take the occasion to fix that test as well.

Fixed in 1f1ff08. Both pkg/virtualkubelet/execute.go and pkg/interlink/api/handler.go now expose an injectable urlSafetyChecker variable (defaulting to isSafeURL). Tests override it to allow loopback httptest servers while production code retains full SSRF protection. Also removed a duplicate SSRF check in handler.go and added a TestIsSafeURL test to explicitly cover the blocking behavior. All tests now pass.

[dciangot]

LGTM, one question @copilot is the network mesh opt-out also disabling the possibility of using the wstunnel port forwarding behavior?

[Copilot]

LGTM, one question @copilot is the network mesh opt-out also disabling the possibility of using the wstunnel port forwarding behavior?

No — the opt-out only disables the FullMesh (WireGuard/subnet) layer, not wstunnel port forwarding.

The two paths are kept separate at line 1564:

if p.shouldCreateWstunnel(pod) || (p.config.Network.FullMesh && !isMeshNetworkingDisabled(pod)) {

shouldCreateWstunnel checks only EnableTunnel + exposed ports — it is completely independent of isMeshNetworkingDisabled. So a pod with interlink.eu/mesh-network: disabled that also has exposed ports still goes through handleWstunnelCreation via the shouldCreateWstunnel branch, and addWstunnelClientAnnotation (fixed in ca4b229) correctly writes the standard wstunnel client commands without the WireGuard/pre-exec snippet. Port forwarding continues to work normally; only the bidirectional mesh overlay is skipped.

[dciangot]

lint/lint action is failing. fix it @copilot

[Copilot]

lint/lint action is failing. fix it @copilot

Fixed in 853fbc5. The gocyclo failure was due to CreatePod having complexity 33 (limit is 30). Refactored it by extracting four helpers:

• setupVPNPodIP – VPN IP assignment block
• setPodInitialStatus – pod phase initialization (init containers vs regular)
• handleRemoteExecutionFailure – goroutine error handling
• buildTerminatedContainerStatuses – builds terminated container status slices

CreatePod complexity is now 16. All tests pass.

[dciangot]

LGTM

[dciangot]

@Bianco95 ready to be merged and tested