scooby87 3a70f91423 fix(vm-disk): fail on storageClass/source edit of existing disk (#3969)
## What this PR does

Fixes #2985. Editing a `VMDisk`'s `storageClass` or `source` after its
DataVolume already exists was silently ignored:
`packages/apps/vm-disk/templates/dv.yaml` looks up the existing
DataVolume and, when found, reused its `spec` verbatim (because
`DataVolume.spec` is immutable in CDI). The edit therefore rendered as a
no-op — the typed CR accepted it and the HelmRelease reported success,
while the DataVolume/PVC kept the original spec and the source of truth
silently diverged from the cluster.

The template now builds the desired `source` into a shared
`$desiredSource` variable (used both for rendering and comparison) and,
when a DataVolume already exists, calls `fail()` with an explicit
message if the requested `storageClass` or `source` differs from the
immutable existing spec — mirroring the explicit size handling already
done in `pvc-resize-hook.yaml`. Storage growth is unaffected and still
flows through the resize hook.

`source` is also marked `@immutable` in `values.yaml`, so the generated
schema now carries the same `x-kubernetes-validations` transition rule
(`self == oldSelf`) that `storageClass` already had; `types.go`,
`values.schema.json` and the generated `vm-disk-rd` CRD are regenerated
to match.

### Verification

- `helm unittest` covers both the immutability guard (via a mocked
existing DataVolume through `kubernetesProvider`, since `lookup` needs a
cluster) and initial-creation source rendering for every source type —
12/12 pass.
- Verified live on a dev cluster with `helm install --dry-run=server`
against a real DataVolume: an unchanged edit renders, a `storageClass`
change fails, a `source` change fails, and a storage grow still renders
the resize hook without tripping the guard.

### Scope note

This PR only makes the drift visible and marks `source` immutable. Two
deeper platform findings sit outside its scope: (1) #2657 (pre-existing)
— the `apps.cozystack.io` aggregated apiserver does not evaluate the
`x-kubernetes-validations` CEL rules on update, so `@immutable` is a
no-op at admission for every Application kind, which is exactly why the
chart-level `fail()` — not the CEL rule — is the substantive guard here;
(2) #3971 — that same apiserver does not honour `--dry-run=server` and
persists the change (surfaced while testing this fix).

### Downstream repositories

Walked the trigger map in `docs/agents/contributing.md` against the diff
file by file. The diff touches only `packages/apps/vm-disk/` (template,
`values.yaml`, regenerated `values.schema.json`, tests), the regenerated
`packages/system/vm-disk-rd/cozyrds/vm-disk.yaml`, and
`api/apps/v1alpha1/vmdisk/types.go`. No package was added, renamed or
removed; no `values.schema.json` field was added, renamed or removed
(only a validation rule on the existing `source` field); no default
changed; `README.md` is unchanged; the `cozyrds` file was regenerated,
not renamed. The terraform provider models fields, defaults and enums
but not CEL immutability, so it is unaffected. No downstream repository
is reached by this change.

- [x] No downstream repository is affected by this change
- [ ] [cozystack/website](https://github.com/cozystack/website) -
follow-up:
- [ ]
[cozystack/terraform-provider-cozystack](https://github.com/cozystack/terraform-provider-cozystack)
- follow-up:
- [ ]
[cozystack/ansible-cozystack](https://github.com/cozystack/ansible-cozystack)
- follow-up:
- [ ] [cozystack/ccp](https://github.com/cozystack/ccp) - follow-up:
- [ ] [cozystack/talm](https://github.com/cozystack/talm) - follow-up:
- [ ] [cozystack/cozyhr](https://github.com/cozystack/cozyhr) -
follow-up:
- [ ] [cozystack/cozy-proxy](https://github.com/cozystack/cozy-proxy) -
follow-up:
- [ ]
[cozystack/cozystack-telemetry-server](https://github.com/cozystack/cozystack-telemetry-server)
- follow-up:
- [ ]
[cozystack/external-apps-example](https://github.com/cozystack/external-apps-example)
- follow-up:
- [ ] [cozystack/examples](https://github.com/cozystack/examples) -
follow-up:

### Release note

```release-note
fix(vm-disk): editing storageClass or source on an existing VMDisk now fails with a clear message instead of being silently ignored; delete and recreate the disk to change these immutable fields.
```


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Added support for blank, HTTP, image, disk, and upload VM disk
sources.
* VM disk sources and storage classes are now protected from unintended
changes, while storage expansion remains supported.
* Existing disks preserve their configured source and storage settings.

* **Bug Fixes**
  * Invalid or conflicting source configurations are rejected.
* Prevented silent no-op updates and incorrect immutability errors for
existing disks.

* **Documentation**
* Documented source and storage class immutability, including the need
to recreate disks when changing either setting.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
2026-09-02 18:40:24 +03:00
2025-10-08 09:43:34 +05:00
2024-02-08 12:04:32 +01:00

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