Prevent incompatible migration of Shoot to Runtime CR

hack/runtime-migrator/go.mod

@@ -0,0 +1,62 @@
+module github.com/kyma-project/infrastructure-manager/hack/runtime-migrator-app
+
+go 1.23.1
+
+require (
+	github.com/gardener/gardener v1.100.0
+	github.com/kyma-project/infrastructure-manager v0.0.0-20241010165136-c9d296aadebd
+	github.com/kyma-project/infrastructure-manager/hack/shoot-comparator v0.0.0-20241010165136-c9d296aadebd
+	github.com/pkg/errors v0.9.1
+	k8s.io/api v0.31.1
+	k8s.io/apimachinery v0.31.1
+	k8s.io/client-go v0.31.1
+	sigs.k8s.io/controller-runtime v0.19.0
+	sigs.k8s.io/yaml v1.4.0
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
+	github.com/emicklei/go-restful/v3 v3.11.0 // indirect
+	github.com/evanphx/json-patch/v5 v5.9.0 // indirect
+	github.com/fxamacker/cbor/v2 v2.7.0 // indirect
+	github.com/gardener/gardener-extension-provider-aws v1.56.1 // indirect
+	github.com/gardener/gardener-extension-provider-gcp v1.37.0 // indirect
+	github.com/gardener/gardener-extension-provider-openstack v1.41.0 // indirect
+	github.com/go-logr/logr v1.4.2 // indirect
+	github.com/go-openapi/jsonpointer v0.21.0 // indirect
+	github.com/go-openapi/jsonreference v0.20.2 // indirect
+	github.com/go-openapi/swag v0.23.0 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang/protobuf v1.5.4 // indirect
+	github.com/google/gnostic-models v0.6.8 // indirect
+	github.com/google/go-cmp v0.6.0 // indirect
+	github.com/google/gofuzz v1.2.0 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/imdario/mergo v0.3.16 // indirect
+	github.com/josharian/intern v1.0.0 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/mailru/easyjson v0.7.7 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/onsi/gomega v1.34.1 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/x448/float16 v0.8.4 // indirect
+	golang.org/x/exp v0.0.0-20240909161429-701f63a606c0 // indirect
+	golang.org/x/net v0.29.0 // indirect
+	golang.org/x/oauth2 v0.22.0 // indirect
+	golang.org/x/sys v0.25.0 // indirect
+	golang.org/x/term v0.24.0 // indirect
+	golang.org/x/text v0.18.0 // indirect
+	golang.org/x/time v0.6.0 // indirect
+	google.golang.org/protobuf v1.34.2 // indirect
+	gopkg.in/inf.v0 v0.9.1 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+	k8s.io/apiextensions-apiserver v0.31.0 // indirect
+	k8s.io/klog/v2 v2.130.1 // indirect
+	k8s.io/kube-openapi v0.0.0-20240228011516-70dd3763d340 // indirect
+	k8s.io/utils v0.0.0-20240902221715-702e33fdd3c3 // indirect
+	sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect
+	sigs.k8s.io/structured-merge-diff/v4 v4.4.1 // indirect
+)

hack/runtime-migrator/input/converter_config.json

@@ -0,0 +1,26 @@
+{
+  "kubernetes": {
+    "defaultVersion": "1.29",
+    "enableKubernetesVersionAutoUpdate": true,
+    "enableMachineImageVersionAutoUpdate": false
+  },
+  "dns": {
+    "secretName": "aws-route53-secret-dev",
+    "domainPrefix": "dev.kyma.ondemand.com",
+    "providerType": "aws-route53"
+  },
+  "aws": {
+    "enableIMDSv2": "true"
+  },
+  "machineImage": {
+    "defaultName" : "gardenlinux",
+    "defaultVersion": "1592.1.0"
+  },
+  "auditLogging": {
+    "policyConfigMapName": "auditPlaceholder",
+    "tenantConfigPath": "placeholder.json"
+  },
+  "gardener": {
+    "projectName": "kyma-dev"
+  }
+}

hack/runtime-migrator/input/runtimeids_sample.json

@@ -1,3 +1,4 @@
-{
-  7c6b4bd3-09d3-462f-b27c-992727b62eec,
-}
+[
+  "7c6b4bd3-09d3-462f-b27c-992727b62eec",
+  "another-id"
+]

hack/runtime-migrator/internal/comparator/comparator.go

@@ -0,0 +1,54 @@
+package comparator
+
+import (
+	"github.com/gardener/gardener/pkg/apis/core/v1beta1"
+	"github.com/kyma-project/infrastructure-manager/hack/shoot-comparator/pkg/shoot"
+)
+
+type Result struct {
+	Equal bool
+	Diff  []Difference
+}
+
+type Difference struct {
+	ShootName  string
+	LeftShoot  v1beta1.Shoot
+	RightShoot v1beta1.Shoot
+	Message    string
+}
+
+func CompareShoots(leftShoot, rightShoot v1beta1.Shoot) (Result, error) {
+
+	differences, err := compare(leftShoot, rightShoot)
+	if err != nil {
+		return Result{}, err
+	}
+
+	equal := len(differences) == 0
+
+	return Result{
+		Equal: equal,
+		Diff:  differences,
+	}, nil
+}
+
+func compare(leftShoot, rightShoot v1beta1.Shoot) ([]Difference, error) {
+	var differences []Difference
+
+	matcher := shoot.NewMatcher(leftShoot)
+	equal, err := matcher.Match(rightShoot)
+	if err != nil {
+		return nil, err
+	}
+
+	if !equal {
+		diff := Difference{
+			ShootName:  leftShoot.Name, // assumption that leftShoot and rightShoot have the same name
+			LeftShoot:  leftShoot,
+			RightShoot: rightShoot,
+			Message:    matcher.FailureMessage(nil),
+		}
+		differences = append(differences, diff)
+	}
+	return differences, nil
+}

hack/runtime-migrator/internal/comparator/report.go

@@ -0,0 +1,151 @@
+package comparator
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"path"
+)
+
+type Report struct {
+	reportFile *os.File
+	contents   string
+}
+
+func SaveComparisonReport(comparisonResult Result, outputDir string, shootName string) (string, error) {
+	resultsDir, err := createOutputDir(outputDir, shootName)
+	if err != nil {
+		return "", err
+	}
+
+	report, err := newReport(resultsDir)
+	if err != nil {
+		return "", err
+	}
+	defer func() {
+		if err := report.Close(); err != nil {
+			log.Printf("Failed to close report file: %q", err)
+		}
+	}()
+
+	writeSummary(&report, comparisonResult, shootName)
+
+	if !comparisonResult.Equal {
+		err = writeDifferencesToReport(&report, comparisonResult.Diff)
+		if err != nil {
+			return "", fmt.Errorf("failed to write results to file: %v", err)
+		}
+
+		err = writeResultsToDiffFiles(comparisonResult.Diff, resultsDir)
+		if err != nil {
+			return "", fmt.Errorf("failed to write files with detected differences: %v", err)
+		}
+	}
+
+	return resultsDir, report.Save()
+}
+
+func newReport(resultsDir string) (Report, error) {
+	resultsFile := path.Join(resultsDir, "results.txt")
+
+	file, err := os.Create(resultsFile)
+	if err != nil {
+		return Report{}, fmt.Errorf("failed to create results file: %v", err)
+	}
+
+	return Report{
+		reportFile: file,
+	}, nil
+}
+
+func createOutputDir(outputDir, shootName string) (string, error) {
+	resultsDir := path.Join(outputDir, shootName)
+
+	err := os.MkdirAll(resultsDir, os.ModePerm)
+	if err != nil {
+		return "", fmt.Errorf("failed to create results directory: %v", err)
+	}
+
+	return resultsDir, nil
+}
+
+func (rw *Report) Save() error {
+	_, err := rw.reportFile.Write([]byte(rw.contents))
+
+	return err
+}
+
+func (rw *Report) Close() error {
+	if rw.reportFile != nil {
+		return rw.reportFile.Close()
+	}
+
+	return nil
+}
+
+func (rw *Report) AddLine(line string) {
+	rw.contents += line + "\n"
+}
+
+func writeSummary(report *Report, comparisonResult Result, shootName string) {
+	report.AddLine(fmt.Sprintf("Comparing generated Shoot with Shoot from Gardener, name: %s", shootName))
+	report.AddLine("")
+
+	if comparisonResult.Equal {
+		report.AddLine("No differences found.")
+	} else {
+		report.AddLine("Differences found.")
+	}
+}
+
+func writeDifferencesToReport(report *Report, differences []Difference) error {
+	if len(differences) == 0 {
+		return nil
+	}
+
+	report.AddLine("")
+	report.AddLine("------------------------------------------------------------------------------------------")
+	report.AddLine("Shoot that differ: ")
+
+	for _, difference := range differences {
+		msg := fmt.Sprintf("-%s", difference.ShootName)
+
+		report.AddLine(msg)
+	}
+
+	report.AddLine("------------------------------------------------------------------------------------------")
+
+	return nil
+}
+
+func writeResultsToDiffFiles(differences []Difference, resultsDir string) error {
+	writeAndCloseFunc := func(filePath string, text string) error {
+		file, err := os.Create(filePath)
+		if err != nil {
+			return err
+		}
+		defer func() {
+			if file != nil {
+				err := file.Close()
+				if err != nil {
+					fmt.Printf("failed to close file: %v", err)
+				}
+			}
+		}()
+
+		_, err = file.Write([]byte(text))
+
+		return err
+	}
+
+	for _, difference := range differences {
+		diffFile := path.Join(resultsDir, fmt.Sprintf("%s.diff", difference.ShootName))
+
+		err := writeAndCloseFunc(diffFile, difference.Message)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}

hack/runtime-migrator/internal/config.go

@@ -3,7 +3,10 @@ package internal
 import (
 	"flag"
 	"fmt"
+	gardener_shoot "github.com/kyma-project/infrastructure-manager/internal/gardener/shoot"
+	"io"
 	"log"
+	"os"
 
 	v1 "github.com/kyma-project/infrastructure-manager/api/v1"
 	corev1 "k8s.io/api/core/v1"
@@ -19,6 +22,7 @@ type Config struct {
 	OutputPath             string
 	IsDryRun               bool
 	InputType              string
+	ConverterConfigPath    string
 }
 
 const (
@@ -44,6 +48,7 @@ func NewConfig() Config {
 	flag.StringVar(&result.OutputPath, "output-path", "/tmp/", "Path where generated yamls will be saved. Directory has to exist.")
 	flag.BoolVar(&result.IsDryRun, "dry-run", true, "Dry-run flag. Has to be set to 'false' otherwise it will not apply the Custom Resources on the KCP cluster.")
 	flag.StringVar(&result.InputType, "input-type", InputTypeJSON, "Type of input to be used. Possible values: **all** (will migrate all gardener shoots), and **json** (will migrate only cluster whose runtimeIds were passed as an input, see the example hack/runtime-migrator/input/runtimeids_sample.json).")
+	flag.StringVar(&result.ConverterConfigPath, "converter-config-filepath", "/path/to/converter_config.json", "A file path to the Gardener Shoot converter configuration.")
 
 	flag.Parse()
 
@@ -99,3 +104,15 @@ func CreateKcpClient(cfg *Config) (client.Client, error) {
 
 	return k8sClient, nil
 }
+
+func LoadConverterConfig(cfg Config) (gardener_shoot.ConverterConfig, error) {
+	getReader := func() (io.Reader, error) {
+		return os.Open(cfg.ConverterConfigPath)
+	}
+	var converterConfig gardener_shoot.ConverterConfig
+	if err := converterConfig.Load(getReader); err != nil {
+		log.Print(err, "unable to load converter configuration")
+		return gardener_shoot.ConverterConfig{}, err
+	}
+	return converterConfig, nil
+}