feat(kustomize): support OCI helm charts

lib/modules/manager/kustomize/__fixtures__/kustomizeHelmChart.yaml

@@ -13,3 +13,7 @@ helmCharts:
   releaseName: moria
   version: 3.1.3
   repo: https://itzg.github.io/minecraft-server-charts
+- name: redis
+  releaseName: redis
+  version: 18.12.1
+  repo: oci://registry-1.docker.io/bitnamicharts

lib/modules/manager/kustomize/__snapshots__/extract.spec.ts.snap

@@ -174,6 +174,15 @@ exports[`modules/manager/kustomize/extract extractPackageFile() parses helmChart
         "https://itzg.github.io/minecraft-server-charts",
       ],
     },
+    {
+      "currentDigest": undefined,
+      "currentValue": "18.12.1",
+      "datasource": "docker",
+      "depName": "redis",
+      "depType": "HelmChart",
+      "packageName": "registry-1.docker.io/bitnamicharts/redis",
+      "pinDigests": false,
+    },
   ],
 }
 `;

lib/modules/manager/kustomize/extract.spec.ts

@@ -175,6 +175,22 @@ describe('modules/manager/kustomize/extract', () => {
       });
       expect(pkg).toEqual(sample);
     });
+
+    it('should correctly extract an OCI chart', () => {
+      const sample = {
+        depName: 'redis',
+        packageName: 'registry-1.docker.io/bitnamicharts/redis',
+        currentValue: '18.12.1',
+        datasource: DockerDatasource.id,
+        pinDigests: false,
+      };
+      const pkg = extractHelmChart({
+        name: sample.depName,
+        version: sample.currentValue,
+        repo: 'oci://registry-1.docker.io/bitnamicharts',
+      });
+      expect(pkg).toEqual(sample);
+    });
   });
 
   describe('image extraction', () => {
@@ -501,8 +517,17 @@ describe('modules/manager/kustomize/extract', () => {
             depType: 'HelmChart',
             depName: 'minecraft',
             currentValue: '3.1.3',
+            datasource: HelmDatasource.id,
             registryUrls: ['https://itzg.github.io/minecraft-server-charts'],
           },
+          {
+            depType: 'HelmChart',
+            depName: 'redis',
+            currentValue: '18.12.1',
+            datasource: DockerDatasource.id,
+            packageName: 'registry-1.docker.io/bitnamicharts/redis',
+            pinDigests: false,
+          },
         ],
       });
     });

lib/modules/manager/kustomize/extract.ts

@@ -7,6 +7,7 @@ import { GitTagsDatasource } from '../../datasource/git-tags';
 import { GithubTagsDatasource } from '../../datasource/github-tags';
 import { HelmDatasource } from '../../datasource/helm';
 import { getDep } from '../dockerfile/extract';
+import { isOCIRegistry } from '../helmv3/utils';
 import type {
   ExtractConfig,
   PackageDependency,
@@ -140,11 +141,28 @@ export function extractImage(
 
 export function extractHelmChart(
   helmChart: HelmChart,
+  aliases?: Record<string, string> | undefined,
 ): PackageDependency | null {
   if (!helmChart.name) {
     return null;
   }
 
+  if (isOCIRegistry(helmChart.repo)) {
+    const dep = getDep(
+      `${helmChart.repo.replace('oci://', '')}/${helmChart.name}:${helmChart.version}`,
+      false,
+      aliases,
+    );
+    return {
+      ...dep,
+      depName: helmChart.name,
+      packageName: dep.depName,
+      // https://github.com/helm/helm/issues/10312
+      // https://github.com/helm/helm/issues/10678
+      pinDigests: false,
+    };
+  }
+
   return {
     depName: helmChart.name,
     currentValue: helmChart.version,
@@ -238,7 +256,7 @@ export function extractPackageFile(
 
   // grab the helm charts
   for (const helmChart of coerceArray(pkg.helmCharts)) {
-    const dep = extractHelmChart(helmChart);
+    const dep = extractHelmChart(helmChart, config.registryAliases);
     if (dep) {
       deps.push({
         ...dep,

lib/modules/manager/kustomize/readme.md

@@ -18,6 +18,7 @@ This manager uses three `depType`s to allow fine-grained control of which depend
 - Component
 - Kustomization
 - HelmChart
+- OCIChart
 
 **Limitations**