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Add optional built-in substitution of last attempted revision #968

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Add optional built-in substitution of last attempted revision #968

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12 changes: 12 additions & 0 deletions internal/controller/kustomization_controller.go
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Original file line number Diff line number Diff line change
Expand Up @@ -95,6 +95,7 @@ type KustomizationReconciler struct {
DefaultServiceAccount string
KubeConfigOpts runtimeClient.KubeConfigOptions
ConcurrentSSA int
ImplicitSubstitutions bool
}

// KustomizationReconcilerOptions contains options for the KustomizationReconciler.
Expand Down Expand Up @@ -617,6 +618,17 @@ func (r *KustomizationReconciler) build(ctx context.Context,
}
}

// add built-in substitutions
if r.ImplicitSubstitutions {
if obj.Spec.PostBuild == nil {
obj.Spec.PostBuild = &kustomizev1.PostBuild{}
}
if obj.Spec.PostBuild.Substitute == nil {
obj.Spec.PostBuild.Substitute = make(map[string]string)
}
obj.Spec.PostBuild.Substitute["FLUX_LAST_ATTEMPTED_REVISION"] = obj.Status.LastAttemptedRevision
}

// run variable substitutions
if obj.Spec.PostBuild != nil {
outRes, err := generator.SubstituteVariables(ctx, r.Client, u, res, false)
Expand Down
4 changes: 4 additions & 0 deletions main.go
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Expand Up @@ -75,6 +75,7 @@ func init() {

func main() {
var (
implicitSubstitutions bool
metricsAddr string
eventsAddr string
healthAddr string
Expand All @@ -101,6 +102,8 @@ func main() {
flag.IntVar(&concurrent, "concurrent", 4, "The number of concurrent kustomize reconciles.")
flag.IntVar(&concurrentSSA, "concurrent-ssa", 4, "The number of concurrent server-side apply operations.")
flag.DurationVar(&requeueDependency, "requeue-dependency", 30*time.Second, "The interval at which failing dependencies are reevaluated.")
flag.BoolVar(&implicitSubstitutions, "implicit-substitutions", false,
"Perform substitutions of built-in values such as last-attempted-revision; has side effects of ALWAYS performing substitutions!")
flag.BoolVar(&noRemoteBases, "no-remote-bases", false,
"Disallow remote bases usage in Kustomize overlays. When this flag is enabled, all resources must refer to local files included in the source artifact.")
flag.IntVar(&httpRetry, "http-retry", 9, "The maximum number of retries when failing to fetch artifacts over HTTP.")
Expand Down Expand Up @@ -223,6 +226,7 @@ func main() {
Metrics: metricsH,
EventRecorder: eventRecorder,
NoCrossNamespaceRefs: aclOptions.NoCrossNamespaceRefs,
ImplicitSubstitutions: implicitSubstitutions,
NoRemoteBases: noRemoteBases,
FailFast: failFast,
ConcurrentSSA: concurrentSSA,
Expand Down