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Aleksei Sviridkin
5af5962edf
Annotate storageClass as immutable across every stateful app whose chart exposes one — clickhouse, foundationdb, harbor, http-cache, kafka (Kafka + ZooKeeper), kubernetes (top-level only), mariadb, mongodb, nats, openbao, opensearch, postgres, qdrant, rabbitmq, redis, vm-disk. Without coverage across the catalogue the UI would render storageClass read-only on some apps and editable on others — a worse mental model than uniform behaviour. The annotation lands at the schema layer (CEL XValidation rule 'self == oldSelf' on values.schema.json / types.go / embedded openAPISchema in cozyrds/<app>.yaml). The cozystack aggregated apiserver does not yet evaluate CEL on application-backed resources; that is tracked at cozystack/cozystack#2657. The UI (cozystack/cozystack-ui#6) consumes the marker today. The PVC-pinning argument is identical for every chart: Kubernetes fixes a PVC's storageClassName at creation time, so editing this field on an existing resource never migrated data. The schema annotation makes that contract explicit. kubernetes.nodeGroups[name].storageClass is intentionally NOT annotated: the field is optional and undefaulted, so a strict 'self == oldSelf' rule would block any future attempt to set it on an existing node group. A richer ratcheting form is needed there — see docs/storage-immutability.md. A refactor in pkg/registry/apps/application/rest.go extracts the inline schema-build path into buildSpecSchema so it can be unit-tested. Three regression tests in rest_spec_schema_test.go pin the contract that x-kubernetes-validations survives the v1->internal->structural conversion (loaded from the actual MariaDB ApplicationDefinition fixture on disk, not a hand-edited mock). Each per-app README gains a one-line blockquote pointing to a new docs/storage-immutability.md that explains the contract and which consumers enforce it today. Requires cozystack/cozyvalues-gen with @immutable support — bump the pre-commit pin in .github/workflows/pre-commit.yml once the release exists. Assisted-By: Claude <noreply@anthropic.com> Signed-off-by: Aleksei Sviridkin <f@lex.la>
34 lines
2.6 KiB
Markdown
34 lines
2.6 KiB
Markdown
# `storageClass` is immutable after creation
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Every stateful Cozystack application that exposes a `storageClass` parameter declares it immutable in the chart schema (`x-kubernetes-validations: [{rule: "self == oldSelf"}]`). This document explains the contract and where it is enforced.
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## Why
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`storageClass` binds the StatefulSet's PVC template. Kubernetes fixes `PersistentVolumeClaim.spec.storageClassName` at PVC creation time — editing `volumeClaimTemplates[].spec.storageClassName` on an existing StatefulSet does not retroactively migrate any data. A user who edits `storageClass` on an existing resource may believe their data is being moved to the new class; it is not. Locking the field at the schema layer makes that contract explicit.
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## What enforces it
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| Consumer | Behavior |
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| --- | --- |
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| Cozystack UI (cozystack/cozystack-ui#6) | Reads the CEL rule from the chart's `openAPISchema` and renders `storageClass` as a disabled, helper-text-annotated field on edit forms. Save-time overlay reinstates the original value before PUT. |
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| `kubectl edit` / `kubectl patch` against the cozystack aggregated apiserver | **Currently accepted** — the apiserver does not yet evaluate CEL rules embedded in `ApplicationDefinition.openAPISchema`. The change passes through but does not propagate to existing PVCs (see "Why" above), so no data corruption is possible. Apiserver enforcement is tracked in cozystack/cozystack#2657. |
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| `kubectl edit` / `kubectl patch` against native CRDs | Enforced today by the standard apiextensions apiserver. |
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## Apps covered
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The following charts annotate at least one `storageClass` field as immutable:
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- `clickhouse`, `foundationdb`, `harbor`, `http-cache`, `kafka` (Kafka + ZooKeeper), `kubernetes` (top-level only — see below), `mariadb`, `mongodb`, `nats`, `openbao`, `opensearch`, `postgres`, `qdrant`, `rabbitmq`, `redis`, `vm-disk`.
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The per-node-group `kubernetes.nodeGroups[name].storageClass` field is intentionally NOT annotated immutable: it is optional and undefaulted, so a strict `self == oldSelf` rule would block any future attempt to set it on an existing node group. If a richer ratcheting form (`!has(oldSelf.storageClass) || self.storageClass == oldSelf.storageClass`) becomes available, the annotation should be added back.
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If you add a new stateful chart that exposes `storageClass`, annotate it the same way:
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```yaml
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## @param {string} storageClass - StorageClass used to store the data.
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## @immutable
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storageClass: ""
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```
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For fields declared inside a `@typedef`, place `## @immutable` on the line below the `## @field` it should attach to.
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