Merge pull request #5799 from fluxcd/backport-5798-to-release/v2.8.x

[release/v2.8.x] fix: validate --source flag in create kustomization command

cmd/flux/create_kustomization.go

@@ -136,6 +136,9 @@ func createKsCmdRun(cmd *cobra.Command, args []string) error {
 	if !strings.HasPrefix(kustomizationArgs.path.String(), "./") {
 		return fmt.Errorf("path must begin with ./")
 	}
+	if kustomizationArgs.source.Name == "" {
+		return fmt.Errorf("source is required")
+	}
 
 	if !createArgs.export {
 		logger.Generatef("generating Kustomization")

cmd/flux/create_kustomization_test.go

@@ -0,0 +1,48 @@
+//go:build unit
+// +build unit
+
+/*
+Copyright 2026 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 TestCreateKustomization(t *testing.T) {
+	tests := []struct {
+		name   string
+		args   string
+		assert assertFunc
+	}{
+		{
+			// A user creating a kustomization without --source gets a confusing
+			// API-level error about spec.sourceRef.kind instead of a clear message.
+			name:   "missing source",
+			args:   "create kustomization my-app --path=./deploy --export",
+			assert: assertError("source is required"),
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			cmd := cmdTestCase{
+				args:   tt.args,
+				assert: tt.assert,
+			}
+			cmd.runTestCmd(t)
+		})
+	}
+}

go.mod

@@ -23,7 +23,7 @@ require (
 	github.com/fluxcd/pkg/chartutil v1.22.1
 	github.com/fluxcd/pkg/envsubst v1.5.0
 	github.com/fluxcd/pkg/git v0.43.1
-	github.com/fluxcd/pkg/kustomize v1.27.1
+	github.com/fluxcd/pkg/kustomize v1.27.2
 	github.com/fluxcd/pkg/oci v0.60.1
 	github.com/fluxcd/pkg/runtime v0.100.4
 	github.com/fluxcd/pkg/sourceignore v0.17.0

go.sum

@@ -204,8 +204,8 @@ github.com/fluxcd/pkg/git v0.43.1 h1:lw29P44wueKzQk79KnYyvisfw//cxg0S4cDeTYx+Slo
 github.com/fluxcd/pkg/git v0.43.1/go.mod h1:3R/AjCe7ee7FqWcAG+2IiuJPOCxrGHF4SCGkuvKS6OQ=
 github.com/fluxcd/pkg/gittestserver v0.25.1 h1:40Ridmy1xKxBM9ItDn012R4VKmaoDqzvGaC5g7xv+mw=
 github.com/fluxcd/pkg/gittestserver v0.25.1/go.mod h1:7fybYb0yej1fFNiF1ohs0Jr0XzyaZQ/cRh3AFEoCtuc=
-github.com/fluxcd/pkg/kustomize v1.27.1 h1:BLOBNLb2N5ObttZA8XJhZ2NqNY1ZjBqQtTpNlIx8/L4=
+github.com/fluxcd/pkg/kustomize v1.27.2 h1:rtoccQyY4SnqXY/wtAXWGEXrINT923z4RBsIdISESik=
-github.com/fluxcd/pkg/kustomize v1.27.1/go.mod h1:A2RQTe9woDPiwJDWFlkoP4oF9eX9DeXr89FEkKnSObk=
+github.com/fluxcd/pkg/kustomize v1.27.2/go.mod h1:A2RQTe9woDPiwJDWFlkoP4oF9eX9DeXr89FEkKnSObk=
 github.com/fluxcd/pkg/oci v0.60.1 h1:mT6WBX+MBIcczzEnw/W4cfXyt5JSRNhRoB/UnJ72K6M=
 github.com/fluxcd/pkg/oci v0.60.1/go.mod h1:w2FGseUl3WGjwRMH/3h6MTI4gKahcBQtnGbn/TQVA34=
 github.com/fluxcd/pkg/runtime v0.100.4 h1:rwvbeoeWN0BTJORJBISJJEkWn6DVfmWwynFl2GseWns=