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/create_source_chart_test.go

@@ -0,0 +1,91 @@
+//go:build unit
+// +build unit
+
+/*
+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 "testing"
+
+func TestCreateSourceChart(t *testing.T) {
+	tmpl := map[string]string{
+		"fluxns": allocateNamespace("flux-system"),
+	}
+	setupSourceChart(t, tmpl)
+
+	tests := []struct {
+		name   string
+		args   string
+		assert assertFunc
+	}{
+		{
+			name:   "missing name",
+			args:   "create source chart --export",
+			assert: assertError("name is required"),
+		},
+		{
+			name:   "missing source reference",
+			args:   "create source chart podinfo --export ",
+			assert: assertError("chart source is required"),
+		},
+		{
+			name:   "missing chart name",
+			args:   "create source chart podinfo --source helmrepository/podinfo --export",
+			assert: assertError("chart name or path is required"),
+		},
+		{
+			name:   "unknown source kind",
+			args:   "create source chart podinfo --source foobar/podinfo --export",
+			assert: assertError(`invalid argument "foobar/podinfo" for "--source" flag: source kind 'foobar' is not supported, must be one of: HelmRepository, GitRepository, Bucket`),
+		},
+		{
+			name:   "basic chart",
+			args:   "create source chart podinfo --source helmrepository/podinfo --chart podinfo --export",
+			assert: assertGoldenTemplateFile("testdata/create_source_chart/basic.yaml", tmpl),
+		},
+		{
+			name:   "chart with basic signature verification",
+			args:   "create source chart podinfo --source helmrepository/podinfo --chart podinfo --verify-provider cosign --export",
+			assert: assertGoldenTemplateFile("testdata/create_source_chart/verify_basic.yaml", tmpl),
+		},
+		{
+			name:   "unknown signature verification provider",
+			args:   "create source chart podinfo --source helmrepository/podinfo --chart podinfo --verify-provider foobar --export",
+			assert: assertError(`invalid argument "foobar" for "--verify-provider" flag: source OCI verify provider 'foobar' is not supported, must be one of: cosign`),
+		},
+		{
+			name:   "chart with complete signature verification",
+			args:   "create source chart podinfo --source helmrepository/podinfo --chart podinfo --verify-provider cosign --verify-issuer foo --verify-subject bar --export",
+			assert: assertGoldenTemplateFile("testdata/create_source_chart/verify_complete.yaml", tmpl),
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			cmd := cmdTestCase{
+				args:   tt.args + " -n " + tmpl["fluxns"],
+				assert: tt.assert,
+			}
+			cmd.runTestCmd(t)
+		})
+	}
+}
+
+func setupSourceChart(t *testing.T, tmpl map[string]string) {
+	t.Helper()
+	testEnv.CreateObjectFile("./testdata/create_source_chart/setup-source.yaml", tmpl, t)
+}