From 3da0dc2cd9b96c40a570467a4d094a6607457471 Mon Sep 17 00:00:00 2001
From: Yishay Mendelsohn <myishay@gmail.com>
Date: Mon, 7 Mar 2022 15:35:55 +0200
Subject: [PATCH] feat: add kustomize support (#466)

Co-authored-by: Noaa Barki <noaabarki@Noaas-MacBook-Pro.local>
---
 cmd/kustomize/main.go         |  91 +++++++++++
 cmd/kustomize/main_test.go    | 183 +++++++++++++++++++++
 cmd/root.go                   |  14 ++
 cmd/test/main.go              |  73 ++++-----
 cmd/test/main_test.go         |  10 +-
 go.mod                        |   8 +-
 go.sum                        | 293 +++++++++++++++++++++++++++++++++-
 pkg/executor/executor.go      |  94 +++++++++++
 pkg/executor/executor_test.go | 104 ++++++++++++
 9 files changed, 812 insertions(+), 58 deletions(-)
 create mode 100644 cmd/kustomize/main.go
 create mode 100644 cmd/kustomize/main_test.go
 create mode 100644 pkg/executor/executor.go
 create mode 100644 pkg/executor/executor_test.go

diff --git a/cmd/kustomize/main.go b/cmd/kustomize/main.go
new file mode 100644
index 0000000..e40ca0c
--- /dev/null
+++ b/cmd/kustomize/main.go
@@ -0,0 +1,91 @@
+package kustomize
+
+import (
+	"os"
+	"strings"
+
+	"github.com/datreeio/datree/cmd/test"
+	"github.com/datreeio/datree/pkg/executor"
+	"github.com/datreeio/datree/pkg/utils"
+	"github.com/spf13/cobra"
+)
+
+type KustomizeCommandRunner interface {
+	BuildCommandDescription(dir string, name string, args []string) string
+	RunCommand(name string, args []string) (executor.CommandOutput, error)
+	ExecuteKustomizeBin(args []string) ([]byte, error)
+	CreateTempFile(tempFilePrefix string, content []byte) (string, error)
+}
+
+type KustomizeContext struct {
+	CommandRunner KustomizeCommandRunner
+}
+
+func New(testCtx *test.TestCommandContext, kustomizeCtx *KustomizeContext) *cobra.Command {
+	testCommandFlags := test.NewTestCommandFlags()
+	kustomizeTestCommand := &cobra.Command{
+		Use:   "test <args>",
+		Short: "Execute datree test for kustomize build <args>",
+		Long:  "Execute datree test for kustomize build <args>. Input should be a kustomize build directory or file.",
+		Example: utils.Example(`
+		# Test the kustomize build for the current directory
+		datree kustomize test .
+
+		# Test the kustomize build for some shared configuration directory
+		datree kustomize test /home/config/production
+
+		# Test the kustomize build from github
+		datree kustomize test https://github.com/kubernetes-sigs/kustomize.git/examples/helloWorld?ref=v1.0.6
+		`),
+		PreRunE: func(cmd *cobra.Command, args []string) error {
+			return test.LoadVersionMessages(testCtx, args, cmd)
+		},
+		RunE: func(cmd *cobra.Command, args []string) error {
+			test.SetSilentMode(cmd)
+			var err error = nil
+			defer func() {
+				if err != nil {
+					testCtx.Printer.PrintMessage(strings.Join([]string{"\n", err.Error(), "\n"}, ""), "error")
+				}
+			}()
+
+			err = testCommandFlags.Validate()
+			if err != nil {
+				return err
+			}
+
+			localConfigContent, err := testCtx.LocalConfig.GetLocalConfiguration()
+			if err != nil {
+				return err
+			}
+
+			testCommandOptions := test.GenerateTestCommandOptions(testCommandFlags, localConfigContent)
+
+			out, err := kustomizeCtx.CommandRunner.ExecuteKustomizeBin(args)
+			if err != nil {
+				return err
+			}
+
+			tempFilename, err := kustomizeCtx.CommandRunner.CreateTempFile("datree_kustomize", out)
+			if err != nil {
+				return err
+			}
+			defer os.Remove(tempFilename)
+
+			err = test.Test(testCtx, []string{tempFilename}, testCommandOptions)
+			if err != nil {
+				return err
+			}
+			return nil
+		},
+	}
+	testCommandFlags.AddFlags(kustomizeTestCommand)
+
+	kustomizeCommand := &cobra.Command{
+		Use: "kustomize",
+	}
+
+	kustomizeCommand.AddCommand(kustomizeTestCommand)
+
+	return kustomizeCommand
+}
diff --git a/cmd/kustomize/main_test.go b/cmd/kustomize/main_test.go
new file mode 100644
index 0000000..cd53a82
--- /dev/null
+++ b/cmd/kustomize/main_test.go
@@ -0,0 +1,183 @@
+package kustomize
+
+import (
+	"testing"
+
+	"github.com/datreeio/datree/bl/evaluation"
+	"github.com/datreeio/datree/bl/messager"
+	"github.com/datreeio/datree/cmd/test"
+	"github.com/datreeio/datree/pkg/ciContext"
+	"github.com/datreeio/datree/pkg/cliClient"
+	"github.com/datreeio/datree/pkg/executor"
+	"github.com/datreeio/datree/pkg/extractor"
+	"github.com/datreeio/datree/pkg/localConfig"
+	"github.com/datreeio/datree/pkg/printer"
+	"github.com/stretchr/testify/mock"
+)
+
+func TestKustomizeTestCommand(t *testing.T) {
+	tests := []*somethingTestCase{
+		test_kustomize_run_method_success(),
+	}
+	for _, tt := range tests {
+		t.Skip(tt.name)
+		// t.Run(tt.name, func(t *testing.T) {
+		// 	cmd := New(tt.testCtx, tt.kustomizeCtx)
+		// 	got := cmd.RunE(cmd, tt.args)
+		// 	assert.Equal(t, tt.expected, got)
+		// })
+	}
+}
+
+type somethingTestCase struct {
+	name         string
+	args         []string
+	testCtx      *test.TestCommandContext
+	kustomizeCtx *KustomizeContext
+	expected     error
+}
+
+func test_kustomize_run_method_success() *somethingTestCase {
+	return &somethingTestCase{
+		name: "should return nil when kustomize run method is successful",
+		args: []string{"./kustomization.yaml"},
+		testCtx: &test.TestCommandContext{
+			K8sValidator: &k8sValidatorMock{},
+			Evaluator:    &mockEvaluator{},
+			LocalConfig:  &LocalConfigMock{},
+			Messager:     &mockMessager{},
+			Printer:      &PrinterMock{},
+			Reader:       &ReaderMock{},
+		},
+		kustomizeCtx: &KustomizeContext{
+			CommandRunner: &mockKustomizeExecuter{},
+		},
+		expected: nil,
+	}
+}
+
+// --- Mocks ---------------------------------------------------------------
+type mockEvaluator struct {
+	mock.Mock
+}
+
+func (m *mockEvaluator) Evaluate(filesConfigurationsChan []*extractor.FileConfigurations, evaluationResponse *cliClient.CreateEvaluationResponse, isInteractiveMode bool) (evaluation.ResultType, error) {
+	args := m.Called(filesConfigurationsChan, evaluationResponse, isInteractiveMode)
+	return args.Get(0).(evaluation.ResultType), args.Error(1)
+}
+
+func (m *mockEvaluator) CreateEvaluation(cliId string, cliVersion string, k8sVersion string, policyName string, ciContext *ciContext.CIContext) (*cliClient.CreateEvaluationResponse, error) {
+	args := m.Called(cliId, cliVersion, k8sVersion, policyName)
+	return args.Get(0).(*cliClient.CreateEvaluationResponse), args.Error(1)
+}
+
+func (m *mockEvaluator) UpdateFailedYamlValidation(invalidYamlFiles []*extractor.InvalidFile, evaluationId int, stopEvaluation bool) error {
+	args := m.Called(invalidYamlFiles, evaluationId, stopEvaluation)
+	return args.Error(0)
+}
+
+func (m *mockEvaluator) UpdateFailedK8sValidation(invalidK8sFiles []*extractor.InvalidFile, evaluationId int, stopEvaluation bool) error {
+	args := m.Called(invalidK8sFiles, evaluationId, stopEvaluation)
+	return args.Error(0)
+}
+
+type mockMessager struct {
+	mock.Mock
+}
+
+func (m *mockMessager) LoadVersionMessages(cliVersion string) chan *messager.VersionMessage {
+	messages := make(chan *messager.VersionMessage, 1)
+	m.Called(cliVersion)
+	return messages
+}
+
+func (m *mockMessager) HandleVersionMessage(messageChannel <-chan *messager.VersionMessage) {
+	m.Called(messageChannel)
+}
+
+type mockKustomizeExecuter struct {
+	mock.Mock
+}
+
+func (m *mockKustomizeExecuter) ExecuteKustomizeBin(args []string) ([]byte, error) {
+	_args := m.Called(args)
+	return _args.Get(0).([]byte), _args.Error(1)
+}
+
+func (m *mockKustomizeExecuter) RunCommand(name string, args []string) (executor.CommandOutput, error) {
+	_args := m.Called(args)
+	return _args.Get(0).(executor.CommandOutput), _args.Error(1)
+}
+
+func (m *mockKustomizeExecuter) BuildCommandDescription(dir string, name string, args []string) string {
+	_args := m.Called(dir, name)
+	return _args.Get(0).(string)
+}
+
+func (m *mockKustomizeExecuter) CreateTempFile(tempFilePrefix string, content []byte) (string, error) {
+	_args := m.Called(tempFilePrefix, content)
+	return _args.Get(0).(string), _args.Error(1)
+}
+
+type k8sValidatorMock struct {
+	mock.Mock
+}
+
+func (kv *k8sValidatorMock) ValidateResources(filesConfigurationsChan chan *extractor.FileConfigurations, concurrency int) (chan *extractor.FileConfigurations, chan *extractor.InvalidFile) {
+	args := kv.Called(filesConfigurationsChan, concurrency)
+	return args.Get(0).(chan *extractor.FileConfigurations), args.Get(1).(chan *extractor.InvalidFile)
+}
+
+func (kv *k8sValidatorMock) GetK8sFiles(filesConfigurationsChan chan *extractor.FileConfigurations, concurrency int) (chan *extractor.FileConfigurations, chan *extractor.FileConfigurations) {
+	args := kv.Called(filesConfigurationsChan, concurrency)
+	return args.Get(0).(chan *extractor.FileConfigurations), args.Get(1).(chan *extractor.FileConfigurations)
+}
+
+func (kv *k8sValidatorMock) InitClient(k8sVersion string, ignoreMissingSchemas bool, schemaLocations []string) {
+}
+
+type PrinterMock struct {
+	mock.Mock
+}
+
+func (p *PrinterMock) PrintWarnings(warnings []printer.Warning) {
+	p.Called(warnings)
+}
+
+func (p *PrinterMock) PrintSummaryTable(summary printer.Summary) {
+	p.Called(summary)
+}
+
+func (p *PrinterMock) PrintEvaluationSummary(evaluationSummary printer.EvaluationSummary, k8sVersion string) {
+	p.Called(evaluationSummary)
+}
+
+func (p *PrinterMock) PrintMessage(messageText string, messageColor string) {
+	p.Called(messageText, messageColor)
+}
+
+func (p *PrinterMock) PrintPromptMessage(promptMessage string) {
+	p.Called(promptMessage)
+}
+
+func (p *PrinterMock) SetTheme(theme *printer.Theme) {
+	p.Called(theme)
+}
+
+type ReaderMock struct {
+	mock.Mock
+}
+
+func (rm *ReaderMock) FilterFiles(paths []string) ([]string, error) {
+	args := rm.Called(paths)
+	return args.Get(0).([]string), nil
+}
+
+type LocalConfigMock struct {
+	mock.Mock
+}
+
+func (lc *LocalConfigMock) GetLocalConfiguration() (*localConfig.ConfigContent, error) {
+	lc.Called()
+	return &localConfig.ConfigContent{CliId: "134kh"}, nil
+}
diff --git a/cmd/root.go b/cmd/root.go
index 63e6cb4..101c004 100644
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -6,12 +6,14 @@ import (
 	"github.com/datreeio/datree/bl/validation"
 	"github.com/datreeio/datree/cmd/completion"
 	"github.com/datreeio/datree/cmd/config"
+	"github.com/datreeio/datree/cmd/kustomize"
 	"github.com/datreeio/datree/cmd/publish"
 	schema_validator "github.com/datreeio/datree/cmd/schema-validator"
 	"github.com/datreeio/datree/cmd/test"
 	"github.com/datreeio/datree/cmd/version"
 	"github.com/datreeio/datree/pkg/cliClient"
 	"github.com/datreeio/datree/pkg/deploymentConfig"
+	"github.com/datreeio/datree/pkg/executor"
 	"github.com/datreeio/datree/pkg/fileReader"
 	"github.com/datreeio/datree/pkg/localConfig"
 	"github.com/datreeio/datree/pkg/printer"
@@ -40,6 +42,16 @@ func init() {
 		K8sValidator: app.context.K8sValidator,
 	}))
 
+	rootCmd.AddCommand(kustomize.New(&test.TestCommandContext{
+		CliVersion:   CliVersion,
+		Evaluator:    app.context.Evaluator,
+		LocalConfig:  app.context.LocalConfig,
+		Messager:     app.context.Messager,
+		Printer:      app.context.Printer,
+		Reader:       app.context.Reader,
+		K8sValidator: app.context.K8sValidator,
+	}, &kustomize.KustomizeContext{CommandRunner: app.context.CommandRunner}))
+
 	rootCmd.AddCommand(version.New(&version.VersionCommandContext{
 		CliVersion: CliVersion,
 		Messager:   app.context.Messager,
@@ -82,6 +94,7 @@ type context struct {
 	Reader              *fileReader.FileReader
 	K8sValidator        *validation.K8sValidator
 	YamlSchemaValidator *yamlSchemaValidator.YamlSchemaValidator
+	CommandRunner       *executor.CommandRunner
 }
 
 type app struct {
@@ -103,6 +116,7 @@ func startup() *app {
 			Reader:              fileReader.CreateFileReader(nil),
 			K8sValidator:        validation.New(),
 			YamlSchemaValidator: yamlSchemaValidator.New(),
+			CommandRunner:       executor.CreateNewCommandRunner(),
 		},
 	}
 }
diff --git a/cmd/test/main.go b/cmd/test/main.go
index 63648ad..eda1538 100644
--- a/cmd/test/main.go
+++ b/cmd/test/main.go
@@ -124,6 +124,23 @@ type TestCommandContext struct {
 	Reader       Reader
 }
 
+func LoadVersionMessages(ctx *TestCommandContext, args []string, cmd *cobra.Command) error {
+	outputFlag, _ := cmd.Flags().GetString("output")
+	if (outputFlag != "json") && (outputFlag != "yaml") && (outputFlag != "xml") {
+
+		messages := ctx.Messager.LoadVersionMessages(ctx.CliVersion)
+		for msg := range messages {
+			ctx.Printer.PrintMessage(msg.MessageText+"\n", msg.MessageColor)
+		}
+	}
+	return nil
+}
+
+func SetSilentMode(cmd *cobra.Command) {
+	cmd.SilenceUsage = true
+	cmd.SilenceErrors = true
+}
+
 func New(ctx *TestCommandContext) *cobra.Command {
 	testCommandFlags := NewTestCommandFlags()
 	testCommand := &cobra.Command{
@@ -145,22 +162,17 @@ func New(ctx *TestCommandContext) *cobra.Command {
 				errMessage := "Requires at least 1 arg\n"
 				return fmt.Errorf(errMessage)
 			}
+			err := testCommandFlags.Validate()
+			if err != nil {
+				return err
+			}
 			return nil
 		},
 		PreRunE: func(cmd *cobra.Command, args []string) error {
-			outputFlag, _ := cmd.Flags().GetString("output")
-			if (outputFlag != "json") && (outputFlag != "yaml") && (outputFlag != "xml") {
-
-				messages := ctx.Messager.LoadVersionMessages(ctx.CliVersion)
-				for msg := range messages {
-					ctx.Printer.PrintMessage(msg.MessageText+"\n", msg.MessageColor)
-				}
-			}
-			return nil
+			return LoadVersionMessages(ctx, args, cmd)
 		},
 		RunE: func(cmd *cobra.Command, args []string) error {
-			cmd.SilenceUsage = true
-			cmd.SilenceErrors = true
+			SetSilentMode(cmd)
 			var err error = nil
 			defer func() {
 				if err != nil {
@@ -168,37 +180,6 @@ func New(ctx *TestCommandContext) *cobra.Command {
 				}
 			}()
 
-			outputFlag, err := cmd.Flags().GetString("output")
-			if err != nil {
-				return err
-			}
-
-			k8sVersion, err := cmd.Flags().GetString("schema-version")
-			if err != nil {
-				return err
-			}
-
-			ignoreMissingSchemas, err := cmd.Flags().GetBool("ignore-missing-schemas")
-			if err != nil {
-				return err
-			}
-
-			onlyK8sFiles, err := cmd.Flags().GetBool("only-k8s-files")
-			if err != nil {
-				return err
-			}
-
-			policy, err := cmd.Flags().GetString("policy")
-			if err != nil {
-				return err
-			}
-
-			schemaLocations, err := cmd.Flags().GetStringArray("schema-location")
-			if err != nil {
-				return err
-			}
-
-			testCommandFlags := TestCommandFlags{Output: outputFlag, K8sVersion: k8sVersion, IgnoreMissingSchemas: ignoreMissingSchemas, PolicyName: policy, SchemaLocations: schemaLocations, OnlyK8sFiles: onlyK8sFiles}
 			err = testCommandFlags.Validate()
 			if err != nil {
 				return err
@@ -209,9 +190,9 @@ func New(ctx *TestCommandContext) *cobra.Command {
 				return err
 			}
 
-			testCommandOptions := generateTestCommandOptions(&testCommandFlags, localConfigContent)
+			testCommandOptions := GenerateTestCommandOptions(testCommandFlags, localConfigContent)
 
-			err = test(ctx, args, testCommandOptions)
+			err = Test(ctx, args, testCommandOptions)
 			if err != nil {
 				return err
 			}
@@ -238,7 +219,7 @@ func (flags *TestCommandFlags) AddFlags(cmd *cobra.Command) {
 	cmd.Flags().BoolVarP(&flags.IgnoreMissingSchemas, "ignore-missing-schemas", "", false, "Ignore missing schemas when executing schema validation step")
 }
 
-func generateTestCommandOptions(testCommandFlags *TestCommandFlags, localConfigContent *localConfig.ConfigContent) *TestCommandOptions {
+func GenerateTestCommandOptions(testCommandFlags *TestCommandFlags, localConfigContent *localConfig.ConfigContent) *TestCommandOptions {
 	k8sVersion := testCommandFlags.K8sVersion
 	if k8sVersion == "" {
 		k8sVersion = localConfigContent.SchemaVersion
@@ -271,7 +252,7 @@ func validateK8sVersionFormatIfProvided(k8sVersion string) error {
 	}
 }
 
-func test(ctx *TestCommandContext, paths []string, options *TestCommandOptions) error {
+func Test(ctx *TestCommandContext, paths []string, options *TestCommandOptions) error {
 
 	if paths[0] == "-" {
 		if len(paths) > 1 {
diff --git a/cmd/test/main_test.go b/cmd/test/main_test.go
index 530b3dc..8d44a55 100644
--- a/cmd/test/main_test.go
+++ b/cmd/test/main_test.go
@@ -243,7 +243,7 @@ func test_testCommand_version_flags_validation(t *testing.T, ctx *TestCommandCon
 }
 
 func test_testCommand_no_flags(t *testing.T, evaluator *mockEvaluator, k8sValidator *K8sValidatorMock, filesConfigurations []*extractor.FileConfigurations, evaluationResponse *cliClient.CreateEvaluationResponse, ctx *TestCommandContext) {
-	test(ctx, []string{"8/*"}, &TestCommandOptions{K8sVersion: "1.18.0", Output: "", PolicyName: "Default", Token: "134kh"})
+	_ = Test(ctx, []string{"8/*"}, &TestCommandOptions{K8sVersion: "1.18.0", Output: "", PolicyName: "Default", Token: "134kh"})
 
 	k8sValidator.AssertCalled(t, "ValidateResources", mock.Anything, 100)
 	evaluator.AssertCalled(t, "CreateEvaluation", "134kh", "", "1.18.0", "Default")
@@ -251,28 +251,28 @@ func test_testCommand_no_flags(t *testing.T, evaluator *mockEvaluator, k8sValida
 }
 
 func test_testCommand_json_output(t *testing.T, evaluator *mockEvaluator, k8sValidator *K8sValidatorMock, filesConfigurations []*extractor.FileConfigurations, evaluationResponse *cliClient.CreateEvaluationResponse, ctx *TestCommandContext) {
-	test(ctx, []string{"8/*"}, &TestCommandOptions{Output: "json"})
+	_ = Test(ctx, []string{"8/*"}, &TestCommandOptions{Output: "json"})
 
 	k8sValidator.AssertCalled(t, "ValidateResources", mock.Anything, 100)
 	evaluator.AssertCalled(t, "Evaluate", filesConfigurations, mock.Anything, mock.Anything)
 }
 
 func test_testCommand_yaml_output(t *testing.T, evaluator *mockEvaluator, k8sValidator *K8sValidatorMock, filesConfigurations []*extractor.FileConfigurations, evaluationResponse *cliClient.CreateEvaluationResponse, ctx *TestCommandContext) {
-	test(ctx, []string{"8/*"}, &TestCommandOptions{Output: "yaml"})
+	_ = Test(ctx, []string{"8/*"}, &TestCommandOptions{Output: "yaml"})
 
 	k8sValidator.AssertCalled(t, "ValidateResources", mock.Anything, 100)
 	evaluator.AssertCalled(t, "Evaluate", filesConfigurations, mock.Anything, mock.Anything)
 }
 
 func test_testCommand_xml_output(t *testing.T, evaluator *mockEvaluator, k8sValidator *K8sValidatorMock, filesConfigurations []*extractor.FileConfigurations, evaluationResponse *cliClient.CreateEvaluationResponse, ctx *TestCommandContext) {
-	test(ctx, []string{"8/*"}, &TestCommandOptions{Output: "xml"})
+	_ = Test(ctx, []string{"8/*"}, &TestCommandOptions{Output: "xml"})
 
 	k8sValidator.AssertCalled(t, "ValidateResources", mock.Anything, 100)
 	evaluator.AssertCalled(t, "Evaluate", filesConfigurations, mock.Anything, mock.Anything)
 }
 
 func test_testCommand_only_k8s_files(t *testing.T, k8sValidator *K8sValidatorMock, filesConfigurations []*extractor.FileConfigurations, evaluationId int, ctx *TestCommandContext) {
-	test(ctx, []string{"8/*"}, &TestCommandOptions{OnlyK8sFiles: true})
+	_ = Test(ctx, []string{"8/*"}, &TestCommandOptions{OnlyK8sFiles: true})
 
 	k8sValidator.AssertCalled(t, "ValidateResources", mock.Anything, 100)
 	k8sValidator.AssertCalled(t, "GetK8sFiles", mock.Anything, 100)
diff --git a/go.mod b/go.mod
index 6e7f9d6..247da44 100644
--- a/go.mod
+++ b/go.mod
@@ -22,6 +22,8 @@ require (
 	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b
 )
 
+require sigs.k8s.io/yaml v1.2.0 // indirect
+
 require (
 	github.com/StackExchange/wmi v0.0.0-20210224194228-fe8f1750fd46 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
@@ -38,7 +40,7 @@ require (
 	github.com/pelletier/go-toml v1.2.0 // indirect
 	github.com/pkg/errors v0.9.1
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/spf13/afero v1.1.2 // indirect
+	github.com/spf13/afero v1.8.1 // indirect
 	github.com/spf13/cast v1.3.0 // indirect
 	github.com/spf13/jwalterweatherman v1.0.0 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
@@ -48,8 +50,8 @@ require (
 	github.com/tklauser/numcpus v0.2.2 // indirect
 	github.com/xeipuuv/gojsonpointer v0.0.0-20180127040702-4e3ac2762d5f // indirect
 	github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 // indirect
-	golang.org/x/sys v0.0.0-20210917161153-d61c044b1678 // indirect
-	golang.org/x/text v0.3.3 // indirect
+	golang.org/x/sys v0.0.0-20220227234510-4e6760a101f9 // indirect
+	golang.org/x/text v0.3.7 // indirect
 	gopkg.in/ini.v1 v1.51.0 // indirect
 )
 
diff --git a/go.sum b/go.sum
index 1ae4f72..a5a8fc5 100644
--- a/go.sum
+++ b/go.sum
@@ -3,13 +3,39 @@ cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMT
 cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
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@@ -31,8 +57,15 @@ github.com/bmatcuk/doublestar/v2 v2.0.4 h1:6I6oUiT/sU27eE2OFcWqBhL1SwjyvQuOssxT4
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@@ -46,6 +79,12 @@ github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZm
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@@ -54,6 +93,8 @@ github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMo
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@@ -64,24 +105,61 @@ github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7a
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+github.com/googleapis/google-cloud-go-testing v0.0.0-20200911160855-bcd43fbb19e8/go.mod h1:dvDLG8qkwmyD9a/MJJN3XJcT3xFxOKAvTZGvuZmac9g=
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 github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY=
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@@ -109,17 +187,21 @@ github.com/hashicorp/logutils v1.0.0/go.mod h1:QIAnNjmIWmVIIkWDTG1z5v++HQmx9WQRO
 github.com/hashicorp/mdns v1.0.0/go.mod h1:tL+uN++7HEJ6SQLQ2/p+z2pH24WQKWjBPkE0mNTz8vQ=
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@@ -168,6 +250,7 @@ github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINE
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
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 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pkg/sftp v1.13.1/go.mod h1:3HaPG6Dq1ILlpPZRO0HVMrsydcdLt6HRDccSgb87qRg=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
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 github.com/posener/complete v1.1.1/go.mod h1:em0nMJCgc9GFtwrmVmEMR/ZL6WyhyjMBndrE9hABlRI=
@@ -175,6 +258,7 @@ github.com/prometheus/client_golang v0.9.1/go.mod h1:7SWBe2y4D6OKWSNQJUaRYU/AaXP
 github.com/prometheus/client_golang v0.9.3/go.mod h1:/TN21ttK/J9q6uSwhBd54HahCDft0ttaMvbicHlPoso=
 github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910/go.mod h1:MbSGuTsp3dbXC40dX6PRTWyKYBIrTGTE9sqQNg2J8bo=
 github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
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@@ -195,8 +279,9 @@ github.com/smartystreets/goconvey v1.6.4 h1:fv0U8FUIMPNf1L9lnHLvLhgicrIVChEkdzIK
 github.com/smartystreets/goconvey v1.6.4/go.mod h1:syvi0/a8iFYH4r/RixwvyeAJjdLS9QV7WQ/tjFTllLA=
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-github.com/spf13/afero v1.1.2 h1:m8/z1t7/fwjysjQRYbP0RD+bUIF/8tJwPdEZsI83ACI=
 github.com/spf13/afero v1.1.2/go.mod h1:j4pytiNVoe2o6bmDsKpLACNPDBIoEAkihy7loJ1B0CQ=
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@@ -214,6 +299,8 @@ github.com/stretchr/objx v0.1.1 h1:2vfRuCMp5sSVIDSqO8oNnWJq7mPa6KVP3iPIwFBuy8A=
 github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
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@@ -232,9 +319,17 @@ github.com/xeipuuv/gojsonschema v1.2.0/go.mod h1:anYRn/JVcOK2ZgGU+IjEV4nwlhoK5sQ
 github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q53MR2AWcXfiuqkDkRtnGDLqkBTpCHuJHxtU=
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+github.com/yuin/goldmark v1.1.25/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
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+github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 go.etcd.io/bbolt v1.3.2/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
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+go.opencensus.io v0.22.2/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
+go.opencensus.io v0.22.3/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
+go.opencensus.io v0.22.4/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
+go.opencensus.io v0.22.5/go.mod h1:5pWMHQbX5EPX2/62yrJeAkowc+lfs/XD7Uxpq3pI6kk=
 go.uber.org/atomic v1.4.0/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
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@@ -243,11 +338,20 @@ golang.org/x/crypto v0.0.0-20181029021203-45a5f77698d3/go.mod h1:6SG95UA2DQfeDnf
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
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 golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
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@@ -257,10 +361,20 @@ golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHl
 golang.org/x/lint v0.0.0-20190409202823-959b441ac422/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
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+golang.org/x/lint v0.0.0-20201208152925-83fdc39ff7b5/go.mod h1:3xt1FjdF8hUf6vQPIChWIBhFzV8gjjsPE/fR3IyQdNY=
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+golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
+golang.org/x/mod v0.1.1-0.20191107180719-034126e5016b/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
+golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
+golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
+golang.org/x/mod v0.4.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
+golang.org/x/mod v0.4.1/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
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@@ -275,14 +389,46 @@ golang.org/x/net v0.0.0-20190501004415-9ce7a6920f09/go.mod h1:t9HGtf8HONx5eT2rtn
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 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
@@ -360,6 +639,7 @@ gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
 gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
@@ -371,7 +651,12 @@ gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
 rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
+rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
 sigs.k8s.io/yaml v1.2.0 h1:kr/MCeFWJWTwyaHoR9c8EjH9OumOmoF9YGiZd7lFm/Q=
 sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=
diff --git a/pkg/executor/executor.go b/pkg/executor/executor.go
new file mode 100644
index 0000000..689b238
--- /dev/null
+++ b/pkg/executor/executor.go
@@ -0,0 +1,94 @@
+package executor
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"os"
+	"os/exec"
+)
+
+// CommandOutput is RunCommand result object
+type CommandOutput struct {
+	ResultOutput bytes.Buffer
+	ErrorOutput  bytes.Buffer
+}
+
+type CommandRunner struct {
+}
+
+func CreateNewCommandRunner() *CommandRunner {
+	return &CommandRunner{}
+}
+
+// BuildCommandDescription executes Cmd strcuts and returns a human-readable description of it
+func (c *CommandRunner) BuildCommandDescription(dir string, name string, args []string) string {
+	command := exec.Command(name, args...)
+	return command.String()
+}
+
+// RunCommand executes Cmd struct with given named program and arguments and returns CommandOutput
+func (c *CommandRunner) RunCommand(name string, args []string) (CommandOutput, error) {
+	var commandOutputBuffer, commandErrorBuffer bytes.Buffer
+
+	command := exec.Command(name, args...)
+
+	command.Stdout = &commandOutputBuffer
+	command.Stderr = &commandErrorBuffer
+
+	err := command.Run()
+	if err != nil {
+		return CommandOutput{
+			ResultOutput: commandOutputBuffer,
+			ErrorOutput:  commandErrorBuffer,
+		}, fmt.Errorf("command output:%s, err:%s", commandOutputBuffer.String(), commandErrorBuffer.String())
+	}
+
+	return CommandOutput{
+		ResultOutput: commandOutputBuffer,
+		ErrorOutput:  commandErrorBuffer,
+	}, nil
+}
+
+func (c *CommandRunner) ExecuteKustomizeBin(args []string) ([]byte, error) {
+	if c.commandExists("kustomize") {
+
+		commandOutput, err := c.RunCommand("kustomize", append([]string{"build"}, args...))
+		if err != nil {
+			return nil, fmt.Errorf("kustomize build errored: %s",
+				commandOutput.ErrorOutput.String())
+		}
+
+		return commandOutput.ResultOutput.Bytes(), nil
+	} else if c.commandExists("kubectl") {
+
+		commandOutput, err := c.RunCommand("kubectl", append([]string{"kustomize"}, args...))
+		if err != nil {
+			return nil, fmt.Errorf("kubectl kustomize errored: %s",
+				commandOutput.ErrorOutput.String())
+		}
+
+		return commandOutput.ResultOutput.Bytes(), nil
+	} else {
+		return nil, errors.New("kubectl or kustomize is not installed")
+	}
+}
+
+func (c *CommandRunner) commandExists(cmd string) bool {
+	_, err := exec.LookPath(cmd)
+	return err == nil
+}
+
+func (c *CommandRunner) CreateTempFile(tempFilePrefix string, content []byte) (string, error) {
+	tempFile, err := os.CreateTemp("", fmt.Sprintf("%s_*.yaml", tempFilePrefix))
+	if err != nil {
+		return "", err
+	}
+
+	_, err = tempFile.Write(content)
+	if err != nil {
+		return "", err
+	}
+
+	return tempFile.Name(), nil
+}
diff --git a/pkg/executor/executor_test.go b/pkg/executor/executor_test.go
new file mode 100644
index 0000000..deda429
--- /dev/null
+++ b/pkg/executor/executor_test.go
@@ -0,0 +1,104 @@
+package executor
+
+import (
+	"errors"
+	"reflect"
+	"testing"
+
+	"github.com/stretchr/testify/mock"
+)
+
+func TestCommandRunner_RunCommand(t *testing.T) {
+	type args struct {
+		name string
+		args []string
+	}
+	tests := []struct {
+		name    string
+		c       *CommandRunner
+		args    args
+		want    CommandOutput
+		wantErr bool
+	}{
+		// TODO: Add test cases.
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			c := &CommandRunner{}
+			got, err := c.RunCommand(tt.args.name, tt.args.args)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("CommandRunner.RunCommand() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("CommandRunner.RunCommand() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+type commandRunnerMock struct {
+	mock.Mock
+}
+
+func (c *commandRunnerMock) RunCommand(name string, arguments []string) (CommandOutput, error) {
+	args := c.Called(name, arguments)
+	return args.Get(0).(CommandOutput), args.Error(1)
+}
+func TestCommandRunner_ExecuteKustomizeBin(t *testing.T) {
+
+	commandRunner := new(commandRunnerMock)
+	commandRunner.On("RunCommand", "kustomize", []string{"build"}).Return(CommandOutput{})
+
+	type args struct {
+		args []string
+	}
+	tests := []struct {
+		name    string
+		c       *CommandRunner
+		args    args
+		want    []byte
+		wantErr bool
+		err     error
+	}{
+		{
+			name: "should return error if kustomize or kubectl is not installed",
+			c:    &CommandRunner{},
+			args: args{
+				args: []string{"bad_arg"},
+			},
+			want:    nil,
+			wantErr: true,
+			err:     errors.New("kubectl or kustomize is not installed"),
+		},
+		{
+			name: "should return error if kustomize or kubectl is not installed",
+			c:    CreateNewCommandRunner(),
+			args: args{
+				args: []string{"bad_arg"},
+			},
+			want:    nil,
+			wantErr: true,
+			err:     errors.New("kubectl or kustomize is not installed"),
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			c := &CommandRunner{}
+			got, err := c.ExecuteKustomizeBin(tt.args.args)
+			if err != nil {
+				if !tt.wantErr {
+					t.Errorf("CommandRunner.ExecuteKustomizeBin() error = %v, wantErr %v", err, tt.wantErr)
+					return
+				}
+			} else {
+				if !reflect.DeepEqual(err, tt.err) {
+					t.Errorf("CommandRunner.ExecuteKustomizeBin() = err %v, want %v", err, tt.err)
+				}
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("CommandRunner.ExecuteKustomizeBin() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
-- 
GitLab