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feat(installer): override Flux images through cozystackOperator.fluxImageOverrides - #5137
Stacked on #5136: the first three commits belong to it. It reuses pkg/imageoverrides from there, so it merges second.
What this PR does
Adds cozystackOperator.fluxImageOverrides to the installer values: the same kustomize images entries as the platform's registries.imageOverrides (name, newName, newTag, digest), applied to Flux itself.
registries.imageOverrides cannot reach Flux. The operator installs Flux from manifests embedded in its binary, before any HelmRelease exists, and the list is delivered by the platform chart, which Flux itself installs. On an air-gapped cluster whose registry holds Flux under other names than ghcr.io/fluxcd, the install stops at its first step. The operator is configured by the installer, so that is where the list has to be.
The installer passes the list to the operator as --flux-image-overrides, one JSON list quoted as a whole, so a value carrying # is not cut short by YAML. An empty list renders no flag, and an installation without overrides keeps the same operator Deployment.
The operator parses the flag strictly (unknown fields and anything after the list are refused), checks it with imageoverrides.Validate, and does so before installing CRDs, so a bad value stops it before it has changed anything in the cluster.
The embedded manifests are rewritten with kustomize's imagetag.LegacyFilter before server-side apply. That is the filter helm-controller runs for an images post-renderer, and sigs.k8s.io/kustomize/api is pinned to v0.20.1, the version helm-controller v1.5.0 is built with (its go.mod replaces the kustomize modules with v0.20.1). An entry therefore behaves the same in either list, including the less obvious rules: newTag alone drops a digest, digest alone drops a tag.
The helm-controller shards clone their container from the flux Deployment, so they pick the override up without further changes.
Changing or removing the list changes the operator Deployment's arguments; the new operator pod re-applies Flux at startup, and without the flag server-side apply restores the upstream images.
New dependencies: sigs.k8s.io/kustomize/api and sigs.k8s.io/kustomize/kyaml, plus go-errors/errors, monochromegane/go-gitignore and xlab/treeprint as indirect ones. The image matching kustomize does lives in its internal packages, so calling the filter is the only way to match Flux exactly rather than reimplement it.
docs/agents/image-refs.md describes the list next to registries.imageOverrides, and the two things a Flux or flux-aio bump has to keep in step: the kustomize version, and the Flux image names, which TestApplyImageOverridesEmbeddedManifests lists so that a rename fails there rather than on a cluster.
Testing:
Go: internal/fluxinstall tests for the rewrite rules (newName, newTag, digest, both, untagged image, registry port, prefix names, initContainers, entry order), CRDs left untouched, int64 kept through the round trip, an empty list changing nothing in the embedded manifests, and every Flux image in them being overridable. Checked against two mutations: skipping the rewrite, and converting back through RNode.Map() (which panics in DeepCopy).
helm-unittest for the installer: no flag without overrides or with [], the exact JSON for one and two entries, and a value with a registry port, a digest and # reaching the flag whole. The last case fails without quote, the JSON cases fail without toJson.
On a live cluster (Talos, make prepare-env, operator image built from this branch): with all five Flux images overridden to registry.altlinux.org/sisyphus/flux-* by tag and digest, the operator logged Overriding Flux images {"count": 5}, the flux pod ran 5/5 on the overridden images, helm-controller-shard0 was recreated on the overridden helm-controller, both OCIRepository sources reconciled, and 97 of 98 HelmReleases were Ready within eight minutes. The remaining one, flux-plunger, was failing before the change, because the test cluster pinned an image older than its chart. Removing the flag put every container, the shard included, back on ghcr.io/fluxcd.
Restarting helm-controller, which any change to the list does, leaves every HelmRelease in DependencyNotReady for several minutes while the dependency graph is walked again. This is how any restart of Flux behaves, not something the override adds.
Screenshots
No UI changes.
Downstream repositories
No downstream repository is affected by this change
feat(installer): `cozystackOperator.fluxImageOverrides` in the installer values renames, retags or repins the Flux images the operator installs, with the same entries as the platform's `registries.imageOverrides`, for registries that hold Flux under other names than `ghcr.io/fluxcd`.
Summary by CodeRabbit
New Features
Added configurable image overrides for platform workloads, applications, packages, and Flux components. Overrides can update image names, tags, or digests.
Invalid or duplicate override entries are rejected, with clear errors during configuration or reconciliation.
Existing release-specific post-rendering remains in place alongside image overrides.
Documentation
Added guidance on configuring image overrides and their coverage and limitations.
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Issues or PRs related to platform infrastructure (bundle, flux, talos, installer)
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This PR changes 1000+ lines, ignoring generated files
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Oct 27, 2026
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Walkthrough
The pull request adds image-override configuration for platform HelmReleases and embedded Flux manifests. It validates and stores platform overrides, applies them through Kustomize post-renderers, and adds Secret watches and tests for the related reconciliation paths.
Changes: Image Override Configuration and Shared Rendering
Layer / File(s)
Summary
Override contract and values packages/core/platform/..., pkg/imageoverrides/*, go.mod, docs/agents/image-refs.md
The platform chart validates registries.imageOverrides and writes non-empty values to the Cozy Values Secret. The new imageoverrides package parses, validates, and loads entries, then creates or merges Kustomize post-renderers.
The shared helper combines release-owned post-renderers with image overrides. HelmRelease templates across packages now call the helper. The CSI chart passes its existing patch through the helper, and tests cover renderer ordering and chart wiring.
Application and Package Reconciliation
Layer / File(s)
Summary
Application API and ApplicationDefinition reconciliation pkg/apiserver/apiserver.go, pkg/registry/apps/application/*, internal/controller/applicationdefinition_helmreconciler*, cmd/cozystack-controller/main.go
Application create and update apply loaded overrides to HelmReleases. The ApplicationDefinition reconciler merges overrides with existing post-renderers and watches the default override Secret.
Package reconciliation and Secret watch internal/operator/package_reconciler*, cmd/cozystack-operator/main.go
The Package reconciler loads overrides from its configured Secret, adds them to generated HelmReleases, and reports invalid tables in Package status. Changes to the matching Secret enqueue Packages.
Embedded Flux Manifest Overrides
Layer / File(s)
Summary
Operator flag and install-time application cmd/cozystack-operator/main.go, internal/fluxinstall/*, packages/core/installer/*
The operator accepts a JSON list of Flux image entries, validates it before installation, and passes it to Flux installation. The installer chart renders the list as a command-line argument when it is non-empty. Tests cover image filtering, validation, and argument rendering.
cozystack/cozystack#5136: Adds the registries.imageOverrides contract, pkg/imageoverrides, and shared Kustomize image-entry validation used by this pull request's Flux override path.
If the cozystack-values Secret is briefly missing, for example during a delete and recreate, existing application releases can lose their image overrides. Air-gapped clusters could then try to pull unreachable upstream images. Distinguish a missing Secret from an explicitly empty override table before merging, or accept this risk explicitly.
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The title names the main change: a new installer value, cozystackOperator.fluxImageOverrides, that overrides Flux images. The changeset adds this value to values.yaml, the operator deployment flag, th…
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The title names the main change: a new installer value, cozystackOperator.fluxImageOverrides, that overrides Flux images. The changeset adds this value to values.yaml, the operator deployment flag, the operator's validation and image-override logic in internal/fluxinstall, and the matching tests and docs. The title follows the conventional commit format and is specific. It is 84 characters, which is slightly long, but it stays readable.
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322-322: Major · Data Integrity & Integration · Heavy lift
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Do not remove release-owned image renderers.
If a chart-owned HelmRelease has an image-only Kustomize post-renderer, imageoverrides.Merge classifies it as an old override and removes it. An empty platform table removes that renderer entirely; a nonempty table replaces it with only platform images. The chart helper explicitly permits release-owned post-renderers, so identify the platform renderer without treating every image-only renderer as platform-owned. (raw.githubusercontent.com)
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Inline comments:
Review comments at @internal/controller/applicationdefinition_helmreconciler.go:
- Line 158: Update the image override handling in the reconciler around
`r.ImageOverrides(ctx)` and the Application update path to distinguish a missing
values Secret from a present Secret with an explicitly empty table. Preserve
existing HelmRelease overrides when the Secret is missing, and only remove them
when the Secret is present and its table is empty.
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Registry mirrors on the nodes can only serve an image under the name it
was pinned with, so an air-gapped install cannot run an image set that
was rebuilt under other names, tags or digests, which is what a
distribution's own registry holds.
The table travels in the cozystack-values Secret as
_cluster.image-overrides and becomes a kustomize images post-renderer
on the releases built in Go: cozystack-operator sets it on every
Package release and re-reconciles when the Secret changes,
cozystack-api sets it on every Application write, and the
ApplicationDefinition reconciler merges it into releases written
before it changed, keeping post-renderers they already carry. A table
that cannot be read stops the write instead of installing upstream
images that would only fail later, at pull time.
Assisted-by: LLM
Signed-off-by: Ivan Pepelyaev <[email protected]>
…leases
A HelmRelease a chart renders, such as a tenant's module releases or a
tenant cluster's addons, is built by no Go code, so the override table
reaches it only if the chart puts it there. cozy-lib.postRenderers
renders the table after the release's own post-renderers, and every
HelmRelease template calls it. The four packages that render one
without cozy-lib now vendor it.
Nothing fails at render time when a template misses the call, so a
bats test walks every HelmRelease template in the tree.
flux push artifact skips symlinks, so a chart's charts/cozy-lib link
does not reach the packages artifact; a component gets the library only
from the libraries its PackageSource declares, in every PackageSource
that installs the chart. make update of a package that vendors an
upstream chart clears charts/ and now puts the link back. A second bats
test holds each component and each update target to that.
Assisted-by: LLM
Signed-off-by: Ivan Pepelyaev <[email protected]>
The platform values take the image override table next to the registry
mirrors it complements and pass it to every release as
_cluster.image-overrides. The chart refuses a table the operator and
the API would refuse, naming the entry, and requires every field to be
a string so that an unquoted tag such as 1.20 cannot reach a release
as 1.2.
Assisted-by: LLM
Signed-off-by: Ivan Pepelyaev <[email protected]>
The operator installs Flux from manifests embedded in its binary,
before any HelmRelease exists, so registries.imageOverrides cannot
reach it: that list is delivered by the platform chart, which Flux
itself installs. A registry that holds Flux under other names than
ghcr.io/fluxcd would stop an air-gapped install at its first step.
The flag takes the same kustomize images entries and rewrites them
with the filter helm-controller runs for a post-renderer, at the
kustomize version helm-controller v1.5.0 is built with, so an entry
copied from one list behaves the same in the other. Shards copy the
image from the flux Deployment and pick the override up from there.
A value that does not parse or validate stops the operator before it
has changed anything in the cluster.
Assisted-by: LLM
Signed-off-by: Ivan Pepelyaev <[email protected]>
Flux images can only be overridden at the moment the operator installs
Flux, and the operator is configured by the installer, so the list has
to be an installer value rather than a platform one.
The list reaches the operator as JSON, quoted as a whole: the operator
refuses anything but one JSON list, and an unquoted value would be cut
short by YAML at the first " #". An empty list renders no flag, so an
installation without overrides keeps the same operator Deployment.
Assisted-by: LLM
Signed-off-by: Ivan Pepelyaev <[email protected]>
The image refs guide said Flux was out of reach of any override. An
agent bumping Flux or flux-aio now has two things to keep in step
that nothing else points at: the kustomize version the operator
filters with, and the Flux image names an override has to match.
Assisted-by: LLM
Signed-off-by: Ivan Pepelyaev <[email protected]>
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area/platformIssues or PRs related to platform infrastructure (bundle, flux, talos, installer)kind/featureCategorizes issue or PR as related to a new featuresize/XXLThis PR changes 1000+ lines, ignoring generated files
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What this PR does
Adds
cozystackOperator.fluxImageOverridesto the installer values: the same kustomizeimagesentries as the platform'sregistries.imageOverrides(name,newName,newTag,digest), applied to Flux itself.registries.imageOverridescannot reach Flux. The operator installs Flux from manifests embedded in its binary, before any HelmRelease exists, and the list is delivered by the platform chart, which Flux itself installs. On an air-gapped cluster whose registry holds Flux under other names thanghcr.io/fluxcd, the install stops at its first step. The operator is configured by the installer, so that is where the list has to be.How it works:
--flux-image-overrides, one JSON list quoted as a whole, so a value carrying#is not cut short by YAML. An empty list renders no flag, and an installation without overrides keeps the same operator Deployment.imageoverrides.Validate, and does so before installing CRDs, so a bad value stops it before it has changed anything in the cluster.imagetag.LegacyFilterbefore server-side apply. That is the filter helm-controller runs for animagespost-renderer, andsigs.k8s.io/kustomize/apiis pinned to v0.20.1, the version helm-controller v1.5.0 is built with (itsgo.modreplaces the kustomize modules with v0.20.1). An entry therefore behaves the same in either list, including the less obvious rules:newTagalone drops a digest,digestalone drops a tag.fluxDeployment, so they pick the override up without further changes.New dependencies:
sigs.k8s.io/kustomize/apiandsigs.k8s.io/kustomize/kyaml, plusgo-errors/errors,monochromegane/go-gitignoreandxlab/treeprintas indirect ones. The image matching kustomize does lives in itsinternalpackages, so calling the filter is the only way to match Flux exactly rather than reimplement it.docs/agents/image-refs.mddescribes the list next toregistries.imageOverrides, and the two things a Flux orflux-aiobump has to keep in step: the kustomize version, and the Flux image names, whichTestApplyImageOverridesEmbeddedManifestslists so that a rename fails there rather than on a cluster.Testing:
internal/fluxinstalltests for the rewrite rules (newName,newTag,digest, both, untagged image, registry port, prefix names,initContainers, entry order), CRDs left untouched,int64kept through the round trip, an empty list changing nothing in the embedded manifests, and every Flux image in them being overridable. Checked against two mutations: skipping the rewrite, and converting back throughRNode.Map()(which panics inDeepCopy).[], the exact JSON for one and two entries, and a value with a registry port, a digest and#reaching the flag whole. The last case fails withoutquote, the JSON cases fail withouttoJson.make prepare-env, operator image built from this branch): with all five Flux images overridden toregistry.altlinux.org/sisyphus/flux-*by tag and digest, the operator loggedOverriding Flux images {"count": 5}, thefluxpod ran 5/5 on the overridden images,helm-controller-shard0was recreated on the overridden helm-controller, bothOCIRepositorysources reconciled, and 97 of 98 HelmReleases wereReadywithin eight minutes. The remaining one,flux-plunger, was failing before the change, because the test cluster pinned an image older than its chart. Removing the flag put every container, the shard included, back onghcr.io/fluxcd.Restarting helm-controller, which any change to the list does, leaves every HelmRelease in
DependencyNotReadyfor several minutes while the dependency graph is walked again. This is how any restart of Flux behaves, not something the override adds.Screenshots
No UI changes.
Downstream repositories
Release note
Summary by CodeRabbit