Add (create|delete|export) source chart commands

The `create source chart` command supports all HelmChart.spec fields
except `.valuesFiles` and `ignoreMissingValuesFiles` as these are
assumingly rarely used fields and the CLI usually only supports
commonly used ones.

closes #4760

Co-authored-by: Stefan Prodan <stefan.prodan@gmail.com>
Signed-off-by: Max Jonas Werner <mail@makk.es>

cmd/flux/export_source_chart.go

@@ -0,0 +1,67 @@
+/*
+Copyright 2024 The Flux authors
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package main
+
+import (
+	"github.com/spf13/cobra"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+
+	sourcev1 "github.com/fluxcd/source-controller/api/v1"
+)
+
+var exportSourceChartCmd = &cobra.Command{
+	Use:   "chart [name]",
+	Short: "Export HelmChart sources in YAML format",
+	Long:  withPreviewNote("The export source chart command exports one or all HelmChart sources in YAML format."),
+	Example: `  # Export all chart sources
+  flux export source chart --all > sources.yaml`,
+	ValidArgsFunction: resourceNamesCompletionFunc(sourcev1.GroupVersion.WithKind(sourcev1.HelmChartKind)),
+	RunE: exportCommand{
+		list:   helmChartListAdapter{&sourcev1.HelmChartList{}},
+		object: helmChartAdapter{&sourcev1.HelmChart{}},
+	}.run,
+}
+
+func init() {
+	exportSourceCmd.AddCommand(exportSourceChartCmd)
+}
+
+func exportHelmChart(source *sourcev1.HelmChart) interface{} {
+	gvk := sourcev1.GroupVersion.WithKind(sourcev1.HelmChartKind)
+	export := sourcev1.HelmChart{
+		TypeMeta: metav1.TypeMeta{
+			Kind:       gvk.Kind,
+			APIVersion: gvk.GroupVersion().String(),
+		},
+		ObjectMeta: metav1.ObjectMeta{
+			Name:        source.Name,
+			Namespace:   source.Namespace,
+			Labels:      source.Labels,
+			Annotations: source.Annotations,
+		},
+		Spec: source.Spec,
+	}
+	return export
+}
+
+func (ex helmChartAdapter) export() interface{} {
+	return exportHelmChart(ex.HelmChart)
+}
+
+func (ex helmChartListAdapter) exportItem(i int) interface{} {
+	return exportHelmChart(&ex.HelmChartList.Items[i])
+}