Refactor manifests generation

- introduce manifestgen pkg, to be consumed by the CLI and Terraform provider
- consolidate defaults in manifestgen/install pkg
- introduce Manifest as the returning type of manifest generation
- add helper function to Manifest for writing multi-doc YAMLs on disk

Signed-off-by: Stefan Prodan <stefan.prodan@gmail.com>

pkg/manifestgen/sync/options.go

@@ -0,0 +1,41 @@
+/*
+Copyright 2020 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 sync
+
+import "time"
+
+type Options struct {
+	Interval     time.Duration
+	URL          string
+	Name         string
+	Namespace    string
+	Branch       string
+	TargetPath   string
+	ManifestFile string
+}
+
+func MakeDefaultOptions() Options {
+	return Options{
+		Interval:     1 * time.Minute,
+		URL:          "",
+		Name:         "gotk-system",
+		Namespace:    "gotk-system",
+		Branch:       "main",
+		ManifestFile: "gotk-sync.yaml",
+		TargetPath:   "",
+	}
+}

pkg/manifestgen/sync/sync.go

@@ -0,0 +1,105 @@
+/*
+Copyright 2020 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 sync
+
+import (
+	"bytes"
+	"fmt"
+	"path/filepath"
+	"strings"
+	"time"
+
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"sigs.k8s.io/yaml"
+
+	kustomizev1 "github.com/fluxcd/kustomize-controller/api/v1beta1"
+	sourcev1 "github.com/fluxcd/source-controller/api/v1beta1"
+
+	"github.com/fluxcd/toolkit/pkg/manifestgen"
+)
+
+func Generate(options Options) (*manifestgen.Manifest, error) {
+	gvk := sourcev1.GroupVersion.WithKind(sourcev1.GitRepositoryKind)
+	gitRepository := sourcev1.GitRepository{
+		TypeMeta: metav1.TypeMeta{
+			Kind:       gvk.Kind,
+			APIVersion: gvk.GroupVersion().String(),
+		},
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      options.Name,
+			Namespace: options.Namespace,
+		},
+		Spec: sourcev1.GitRepositorySpec{
+			URL: options.URL,
+			Interval: metav1.Duration{
+				Duration: options.Interval,
+			},
+			Reference: &sourcev1.GitRepositoryRef{
+				Branch: options.Branch,
+			},
+			SecretRef: &corev1.LocalObjectReference{
+				Name: options.Name,
+			},
+		},
+	}
+
+	gitData, err := yaml.Marshal(gitRepository)
+	if err != nil {
+		return nil, err
+	}
+
+	gvk = kustomizev1.GroupVersion.WithKind(kustomizev1.KustomizationKind)
+	kustomization := kustomizev1.Kustomization{
+		TypeMeta: metav1.TypeMeta{
+			Kind:       gvk.Kind,
+			APIVersion: gvk.GroupVersion().String(),
+		},
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      options.Name,
+			Namespace: options.Namespace,
+		},
+		Spec: kustomizev1.KustomizationSpec{
+			Interval: metav1.Duration{
+				Duration: 10 * time.Minute,
+			},
+			Path:  fmt.Sprintf("./%s", strings.TrimPrefix(options.TargetPath, "./")),
+			Prune: true,
+			SourceRef: kustomizev1.CrossNamespaceSourceReference{
+				Kind: sourcev1.GitRepositoryKind,
+				Name: options.Name,
+			},
+			Validation: "client",
+		},
+	}
+
+	ksData, err := yaml.Marshal(kustomization)
+	if err != nil {
+		return nil, err
+	}
+
+	return &manifestgen.Manifest{
+		Path:    filepath.Join(options.TargetPath, options.Namespace, options.ManifestFile),
+		Content: fmt.Sprintf("---\n%s---\n%s", resourceToString(gitData), resourceToString(ksData)),
+	}, nil
+}
+
+func resourceToString(data []byte) string {
+	data = bytes.Replace(data, []byte("  creationTimestamp: null\n"), []byte(""), 1)
+	data = bytes.Replace(data, []byte("status: {}\n"), []byte(""), 1)
+	return string(data)
+}

pkg/manifestgen/sync/sync_test.go

@@ -0,0 +1,41 @@
+/*
+Copyright 2020 The Flux CD contributors.
+
+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 sync
+
+import (
+	"fmt"
+	kustomizev1 "github.com/fluxcd/kustomize-controller/api/v1beta1"
+	sourcev1 "github.com/fluxcd/source-controller/api/v1beta1"
+	"strings"
+	"testing"
+)
+
+func TestGenerate(t *testing.T) {
+	opts := MakeDefaultOptions()
+	output, err := Generate(opts)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	for _, apiVersion := range []string{sourcev1.GroupVersion.String(), kustomizev1.GroupVersion.String()} {
+		if !strings.Contains(output.Content, apiVersion) {
+			t.Errorf("apiVersion '%s' not found", apiVersion)
+		}
+	}
+
+	fmt.Println(output.Content)
+}