Add enhancement: introducing hcp from-hub CLI - #2085
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WalkthroughThe enhancement defines the proposed ChangesHCP from-hub CLI
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🟡 Moderate · up to The proposal leaves important retry, rollback, deletion-ordering, and failure-reporting behavior unspecified, which could lead to stale HostedCluster resources, unintended cleanup, or users missing a cleanup failure. Merge should wait for these contracts to be defined or explicitly accepted by the owners. Sequence Diagram(s)sequenceDiagram
participant User
participant HCPFromHubCLI
participant HubProxy
participant HostingCluster
User->>HCPFromHubCLI: Request HostedCluster lifecycle operation
HCPFromHubCLI->>HubProxy: Send validated request
HubProxy->>HostingCluster: Read metadata or apply changes
HostingCluster-->>HubProxy: Return state or operation result
HubProxy-->>HCPFromHubCLI: Return response or HTTP 409
HCPFromHubCLI-->>User: Report result or error
Suggested reviewers: 🚥 Pre-merge checks | ✅ 15✅ Passed checks (15 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Actionable comments posted: 5
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Inline comments:
In `@enhancements/hypershift/introducing-hcp-from-hub-cli.md`:
- Around line 304-307: Update the from-hub edit PUT flow to preserve and require
the live HostedCluster metadata.resourceVersion, and ensure the proxy/API uses
that version for optimistic concurrency. Handle HTTP 409 responses explicitly by
surfacing a conflict to the user rather than overwriting newer controller or
operator changes.
- Around line 342-351: Constrain the proposed CreateRequest.ExtraObjects
contract with server-side validation: allow only an explicit list of supported
GroupVersionKinds, require every namespaced object’s namespace to equal the
request namespace, and reject cluster-scoped or cross-namespace objects before
processing. Do not permit arbitrary RawExtension objects or rely solely on
RBAC-checked apply authorization.
- Around line 650-661: Align the ExtraObjects compatibility rules so an older
hypershift-addon-operator cannot silently ignore the field. Add capability
negotiation or reject requests containing unsupported ExtraObjects, returning a
clear “unsupported by proxy” error; preserve additive wire compatibility for
clients and proxies that both support ExtraObjects.
- Around line 689-694: Define the partial-create failure recovery behavior for
the hypershift-addon-operator flow described in the “ExtraObjects decode/apply
fails” section. Specify compensating cleanup, idempotent reconciliation, or an
explicit operator recovery procedure so previously created Secrets and
ExtraObjects do not leave orphaned resources or make retries fail with
AlreadyExists.
- Line 176: Update the architecture code fence in the documentation to specify
the text language identifier, changing the unannotated fence to a text-labeled
fence so markdownlint MD040 is satisfied.
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Inline comments:
In `@enhancements/hypershift/introducing-hcp-from-hub-cli.md`:
- Around line 726-732: Update the compensating-cleanup contract for the create
request so failures after HostedCluster creation also address created
HostedCluster and NodePool objects using ownership-aware deletion, or explicitly
define an idempotent resume/reconciliation path for retrying partial state.
Ensure cleanup failures are surfaced separately from the original creation
error, while preserving cleanup of Secrets and ExtraObjects.
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Actionable comments posted: 4
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Inline comments:
In `@enhancements/hypershift/introducing-hcp-from-hub-cli.md`:
- Around line 758-766: Define an immutable, unique request ID and payload
fingerprint for each operation, and require ownership checks to match the
complete request identity before cleanup or reuse. In the proxy’s create/resume
and compensating-cleanup flow, serialize retries and cleanup, accept existing
resources only when ownership and payload match exactly, and return a conflict
for mismatches; update the contract around NodePool, HostedCluster,
ExtraObjects, and Secrets accordingly.
- Around line 762-763: Expand the proxy retry contract in the dual-failure
section to specify how both the original creation error and compensating cleanup
failure are represented, including response fields, HTTP status, CLI exit
status, and user-visible output. Ensure the CLI explicitly reports incomplete
cleanup so retries remain safe and the cleanup failure is not hidden.
- Around line 424-427: Update the OKE exclusion heading to use the correct
product name, “OCI Kubernetes Engine,” while preserving the existing
scope-exclusion text.
- Around line 758-760: Update the compensating cleanup flow to wait for each
deletion to complete before deleting the next dependent object, polling with a
bounded timeout and reporting timeout as a cleanup failure. Preserve the reverse
dependency order and ownership-aware deletion, and add an integration test using
a blocking finalizer to verify the behavior.
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csrwng
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csrwng
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Hi @yiraeChristineKim
I did a first pass through the doc and left some comments.
Also, have we considered whether this command (or the proxy) could be used in a non-interactive way for gitops?
| core design, the main risk is **silent incorrectness**: if from-hub calls | ||
| `util.GetClient()` / `util.GetConfig()` without special handling, validation and | ||
| defaulting would run against the **hub** while the user believes they are | ||
| acting on the **hosting** cluster. That is worse than not shipping the feature |
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I agree with this risk. However, I don’t see in the design document how we can prevent from accidentally calling code in the from-hub path that would try to access the current cluster thinking that it is the hosting cluster.
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below line 440 Core-CLI reuse requirements (1–10), I wrote how to prevent.
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I did see the requirements, it's just not clear how they will be enforced. What will stop a future developer from introducing code that breaks them? Will we do that via unit tests? Or a wrapper around the client?
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Plan is allow-list first — only proxy-safe flags are accepted; the rest stay rejected. The requirements table maps each flag/behavior to client vs proxy work. Unit tests lock in the client rules; e2e/integration verify we actually target the hosting cluster end-to-end.
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Tech review scope isn’t “match the full HCP CLI today.” It’s “ship from-hub correctly from the hub”, other flags added gradually via the allow-list.
| 3. The proxy checks `managedcluster:admin`, impersonates toward the hosting | ||
| cluster, reads the hosting cluster's `supported-versions` ConfigMap, and | ||
| returns `serverVersion` (and `supportedVersions`, reused by W2) to the CLI. | ||
| 4. `from-hub` compares the CLI's own commit SHA against the returned hosting |
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could you not have hosting clusters at different versions? Do they all need to match your cli version exactly?
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No hosting clusters don’t all have to run the same version, and they don’t all have to match your CLI all the time.
--version-check is optional and per command, per hosting cluster.
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I will make clear this part
| 4. `from-hub` compares the CLI's own commit SHA against the returned hosting | ||
| `serverVersion` and fails fast on mismatch — checking the cluster the user | ||
| actually intends to create the HostedCluster on. | ||
| 5. `from-hub` renders the HostedCluster/NodePool/Secret/Role/ConfigMap |
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When creating an AWS hosted cluster, before rendering manifests we create infrastructure and iam roles. I don’t see that part mentioned here. Are we assuming that the hub operator will have the power to perform those operations?
Also, if we don’t allow a separate create infrastructure / render / apply, then certain API configurations that can only be made on creation will not be possible.
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hcp create aws --render creates the infrastructures. Therefore, in the from-hub workflow, I will always use hcp create aws --render first. I will then send the rendered output to hcp-proxy, which will pass the required resources to the hosting cluster.
I will rewrite this section of the documentation to make the workflow and data flow clearer.
| #### Delete (target behavior) | ||
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| 1. The hub operator runs `hcp from-hub delete my-cluster --hosting-cluster | ||
| <name>` for an AWS HostedCluster. |
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During the delete phase, we add the cli finalizer first. I don’t see that mentioned in the doc.
After starting HostedCluster deletion, we wait for all finalizers to go away apart from the one the cli added, and before removing that finalizer, directly destroy AWS resources (in the AWS case)
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Yes, I remove the finalizer after all the infrastructure has been removed. I will mention this again
hcp from-hub create / delete are normal CLI commands <- they can run from CI or a script with hub kubeconfig + managedcluster:admin on the target ManagedCluster, same as other oc/ACM hub workflows. |
Define the initial hcp from-hub subcommand for ACM/MCE hub operators, including Dev Preview scope (aws and kubevirt), core CLI allow-list, hosting-cluster correctness via the HCP proxy, and graduation criteria. Signed-off-by: Yirae Christine Kim <yikim@redhat.com> Co-Authored-By: Cursor <cursoragent@cursor.com>
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Replace duplicate requirement bullet lists with one authoritative table, clarify requirement 10 pre-render validation wording, and document that --namespace defaults to clusters consistent with hcp create cluster. Co-authored-by: Cursor <cursoragent@cursor.com>
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2 participants
Jira: ACM-39062
Summary
introducing-hcp-from-hub-cli.mdfor a newhcp from-hubsubcommand in the HCP CLIawsandkubevirt), core CLI argument allow-list, and hosting-cluster correctness requirements via the HCP proxyTest plan
Made with Cursor
Summary by CodeRabbit
hcp from-hubCLI for creating, editing, and deleting HostedClusters through the hub.