Initialize kubernetes config on upgrade

This change revealed more about how the system needs to work, so there
are some supporting changes:

* helm.upgrade and helm.help are now vars rather than raw functions.
    This allows unit tests to target the "which step should we run"
    logic directly by comparing function pointers, rather than having to
    configure/prepare a fully-valid Plan and then infer the logic’s
    correctness based on the Plan’s state.
* configuration that's specific to kubeconfig initialization is now part
    of the InitKube struct rather than run.Config, since other steps
    shouldn’t need access to those settings (particularly the secrets).
* Step.Execute now receives a run.Config so it can log debug output.

Dockerfile

@@ -2,6 +2,7 @@ FROM alpine/helm
 MAINTAINER Erin Call <erin@liffft.com>
 
 COPY build/drone-helm /bin/drone-helm
+COPY kubeconfig /root/.kube/config.tpl
 
 LABEL description="Helm 3 plugin for Drone 3"
 LABEL base="alpine/helm"

README.md

@@ -7,7 +7,7 @@ TODO:
 * [x] Make `cmd/drone-helm/main.go` actually invoke `helm`
 * [x] Make `golint` part of the build process (and make it pass)
 * [x] Implement debug output
-* [ ] Flesh out `helm upgrade` until it's capable of working
+* [x] Flesh out `helm upgrade` until it's capable of working
 * [ ] Implement config settings for `upgrade`
 * [ ] Implement `helm lint`
 * [ ] Implement `helm delete`

internal/helm/config.go

@@ -25,7 +25,7 @@ type Config struct {
 	StringValues   string   `split_words:"true"`
 	ValuesFiles    []string `split_words:"true"`
 	Namespace      string   ``
-	Token          string   `envconfig:"KUBERNETES_TOKEN"`
+	KubeToken      string   `envconfig:"KUBERNETES_TOKEN"`
 	SkipTLSVerify  bool     `envconfig:"SKIP_TLS_VERIFY"`
 	Certificate    string   `envconfig:"KUBERNETES_CERTIFICATE"`
 	APIServer      string   `envconfig:"API_SERVER"`

internal/helm/mock_step_test.go

@@ -0,0 +1,62 @@
+// Code generated by MockGen. DO NOT EDIT.
+// Source: ./internal/helm/plan.go
+
+// Package mock_helm is a generated GoMock package.
+package helm
+
+import (
+	gomock "github.com/golang/mock/gomock"
+	run "github.com/pelotech/drone-helm3/internal/run"
+	reflect "reflect"
+)
+
+// MockStep is a mock of Step interface
+type MockStep struct {
+	ctrl     *gomock.Controller
+	recorder *MockStepMockRecorder
+}
+
+// MockStepMockRecorder is the mock recorder for MockStep
+type MockStepMockRecorder struct {
+	mock *MockStep
+}
+
+// NewMockStep creates a new mock instance
+func NewMockStep(ctrl *gomock.Controller) *MockStep {
+	mock := &MockStep{ctrl: ctrl}
+	mock.recorder = &MockStepMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockStep) EXPECT() *MockStepMockRecorder {
+	return m.recorder
+}
+
+// Prepare mocks base method
+func (m *MockStep) Prepare(arg0 run.Config) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Prepare", arg0)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// Prepare indicates an expected call of Prepare
+func (mr *MockStepMockRecorder) Prepare(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Prepare", reflect.TypeOf((*MockStep)(nil).Prepare), arg0)
+}
+
+// Execute mocks base method
+func (m *MockStep) Execute(arg0 run.Config) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Execute", arg0)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// Execute indicates an expected call of Execute
+func (mr *MockStepMockRecorder) Execute(arg0 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Execute", reflect.TypeOf((*MockStep)(nil).Execute), arg0)
+}

internal/helm/plan.go

@@ -1,89 +1,108 @@
 package helm
 
 import (
-	"errors"
 	"fmt"
 	"github.com/pelotech/drone-helm3/internal/run"
 	"os"
 )
 
+const kubeConfigTemplate = "/root/.kube/config.tpl"
+
 // A Step is one step in the plan.
 type Step interface {
 	Prepare(run.Config) error
-	Execute() error
+	Execute(run.Config) error
 }
 
 // A Plan is a series of steps to perform.
 type Plan struct {
-	steps []Step
+	steps  []Step
+	cfg    Config
+	runCfg run.Config
 }
 
 // NewPlan makes a plan for running a helm operation.
 func NewPlan(cfg Config) (*Plan, error) {
-	runCfg := run.Config{
-		Debug:          cfg.Debug,
-		KubeConfig:     cfg.KubeConfig,
-		Values:         cfg.Values,
-		StringValues:   cfg.StringValues,
-		ValuesFiles:    cfg.ValuesFiles,
-		Namespace:      cfg.Namespace,
-		Token:          cfg.Token,
-		SkipTLSVerify:  cfg.SkipTLSVerify,
-		Certificate:    cfg.Certificate,
-		APIServer:      cfg.APIServer,
-		ServiceAccount: cfg.ServiceAccount,
-		Stdout:         os.Stdout,
-		Stderr:         os.Stderr,
+	p := Plan{
+		cfg: cfg,
+		runCfg: run.Config{
+			Debug:        cfg.Debug,
+			KubeConfig:   cfg.KubeConfig,
+			Values:       cfg.Values,
+			StringValues: cfg.StringValues,
+			ValuesFiles:  cfg.ValuesFiles,
+			Namespace:    cfg.Namespace,
+			Stdout:       os.Stdout,
+			Stderr:       os.Stderr,
+		},
 	}
 
-	p := Plan{}
-	switch cfg.Command {
-	case "upgrade":
-		steps, err := upgrade(cfg, runCfg)
-		if err != nil {
-			return nil, err
+	p.steps = (*determineSteps(cfg))(cfg)
+
+	for i, step := range p.steps {
+		if cfg.Debug {
+			fmt.Fprintf(os.Stderr, "calling %T.Prepare (step %d)\n", step, i)
 		}
-		p.steps = steps
-	case "delete":
-		return nil, errors.New("not implemented")
-	case "lint":
-		return nil, errors.New("not implemented")
-	case "help":
-		steps, err := help(cfg, runCfg)
-		if err != nil {
+
+		if err := step.Prepare(p.runCfg); err != nil {
+			err = fmt.Errorf("while preparing %T step: %w", step, err)
 			return nil, err
 		}
-		p.steps = steps
-	default:
-		switch cfg.DroneEvent {
-		case "push", "tag", "deployment", "pull_request", "promote", "rollback":
-			steps, err := upgrade(cfg, runCfg)
-			if err != nil {
-				return nil, err
-			}
-			p.steps = steps
-		default:
-			return nil, errors.New("not implemented")
-		}
 	}
 
 	return &p, nil
 }
 
+// determineSteps is primarily for the tests' convenience: it allows testing the "which stuff should
+// we do" logic without building a config that meets all the steps' requirements.
+func determineSteps(cfg Config) *func(Config) []Step {
+	switch cfg.Command {
+	case "upgrade":
+		return &upgrade
+	case "delete":
+		panic("not implemented")
+	case "lint":
+		panic("not implemented")
+	case "help":
+		return &help
+	default:
+		switch cfg.DroneEvent {
+		case "push", "tag", "deployment", "pull_request", "promote", "rollback":
+			return &upgrade
+		default:
+			panic("not implemented")
+		}
+	}
+}
+
 // Execute runs each step in the plan, aborting and reporting on error
 func (p *Plan) Execute() error {
-	for _, step := range p.steps {
-		if err := step.Execute(); err != nil {
-			return err
+	for i, step := range p.steps {
+		if p.cfg.Debug {
+			fmt.Fprintf(os.Stderr, "calling %T.Execute (step %d)\n", step, i)
+		}
+
+		if err := step.Execute(p.runCfg); err != nil {
+			return fmt.Errorf("in execution step %d: %w", i, err)
 		}
 	}
 
 	return nil
 }
 
-func upgrade(cfg Config, runCfg run.Config) ([]Step, error) {
+var upgrade = func(cfg Config) []Step {
 	steps := make([]Step, 0)
-	upgrade := &run.Upgrade{
+
+	steps = append(steps, &run.InitKube{
+		SkipTLSVerify:  cfg.SkipTLSVerify,
+		Certificate:    cfg.Certificate,
+		APIServer:      cfg.APIServer,
+		ServiceAccount: cfg.ServiceAccount,
+		Token:          cfg.KubeToken,
+		TemplateFile:   kubeConfigTemplate,
+	})
+
+	steps = append(steps, &run.Upgrade{
 		Chart:        cfg.Chart,
 		Release:      cfg.Release,
 		ChartVersion: cfg.ChartVersion,
@@ -91,23 +110,12 @@ func upgrade(cfg Config, runCfg run.Config) ([]Step, error) {
 		ReuseValues:  cfg.ReuseValues,
 		Timeout:      cfg.Timeout,
 		Force:        cfg.Force,
-	}
-	if err := upgrade.Prepare(runCfg); err != nil {
-		err = fmt.Errorf("while preparing upgrade step: %w", err)
-		return steps, err
-	}
-	steps = append(steps, upgrade)
+	})
 
-	return steps, nil
+	return steps
 }
 
-func help(cfg Config, runCfg run.Config) ([]Step, error) {
+var help = func(cfg Config) []Step {
 	help := &run.Help{}
-
-	if err := help.Prepare(runCfg); err != nil {
-		err = fmt.Errorf("while preparing help step: %w", err)
-		return []Step{}, err
-	}
-
-	return []Step{help}, nil
+	return []Step{help}
 }

internal/helm/plan_test.go

@@ -2,7 +2,9 @@ package helm
 
 import (
 	"fmt"
+	"github.com/golang/mock/gomock"
 	"github.com/stretchr/testify/suite"
+	"os"
 	"testing"
 
 	"github.com/pelotech/drone-helm3/internal/run"
@@ -16,48 +18,147 @@ func TestPlanTestSuite(t *testing.T) {
 	suite.Run(t, new(PlanTestSuite))
 }
 
-func (suite *PlanTestSuite) TestNewPlanUpgradeCommand() {
-	cfg := Config{
-		Command: "upgrade",
-		Chart:   "billboard_top_100",
-		Release: "post_malone_circles",
+func (suite *PlanTestSuite) TestNewPlan() {
+	ctrl := gomock.NewController(suite.T())
+	stepOne := NewMockStep(ctrl)
+	stepTwo := NewMockStep(ctrl)
+
+	origHelp := help
+	help = func(cfg Config) []Step {
+		return []Step{stepOne, stepTwo}
 	}
+	defer func() { help = origHelp }()
+
+	cfg := Config{
+		Command:      "help",
+		Debug:        false,
+		KubeConfig:   "/branch/.sfere/profig",
+		Values:       "steadfastness,forthrightness",
+		StringValues: "tensile_strength,flexibility",
+		ValuesFiles:  []string{"/root/price_inventory.yml"},
+		Namespace:    "outer",
+	}
+
+	runCfg := run.Config{
+		Debug:        false,
+		KubeConfig:   "/branch/.sfere/profig",
+		Values:       "steadfastness,forthrightness",
+		StringValues: "tensile_strength,flexibility",
+		ValuesFiles:  []string{"/root/price_inventory.yml"},
+		Namespace:    "outer",
+		Stdout:       os.Stdout,
+		Stderr:       os.Stderr,
+	}
+
+	stepOne.EXPECT().
+		Prepare(runCfg)
+	stepTwo.EXPECT().
+		Prepare(runCfg)
 
 	plan, err := NewPlan(cfg)
 	suite.Require().Nil(err)
-	suite.Require().Equal(1, len(plan.steps))
-
-	suite.Require().IsType(&run.Upgrade{}, plan.steps[0])
-	step, _ := plan.steps[0].(*run.Upgrade)
-
-	suite.Equal("billboard_top_100", step.Chart)
-	suite.Equal("post_malone_circles", step.Release)
+	suite.Equal(cfg, plan.cfg)
+	suite.Equal(runCfg, plan.runCfg)
 }
 
-func (suite *PlanTestSuite) TestNewPlanUpgradeFromDroneEvent() {
-	cfg := Config{
-		Chart:   "billboard_top_100",
-		Release: "lizzo_good_as_hell",
-	}
+func (suite *PlanTestSuite) TestNewPlanAbortsOnError() {
+	ctrl := gomock.NewController(suite.T())
+	stepOne := NewMockStep(ctrl)
+	stepTwo := NewMockStep(ctrl)
 
-	upgradeEvents := []string{"push", "tag", "deployment", "pull_request", "promote", "rollback"}
-	for _, event := range upgradeEvents {
-		cfg.DroneEvent = event
-		plan, err := NewPlan(cfg)
-		suite.Require().Nil(err)
-		suite.Require().Equal(1, len(plan.steps), fmt.Sprintf("for event type '%s'", event))
-		suite.IsType(&run.Upgrade{}, plan.steps[0], fmt.Sprintf("for event type '%s'", event))
+	origHelp := help
+	help = func(cfg Config) []Step {
+		return []Step{stepOne, stepTwo}
 	}
-}
+	defer func() { help = origHelp }()
 
-func (suite *PlanTestSuite) TestNewPlanHelpCommand() {
 	cfg := Config{
 		Command: "help",
 	}
 
-	plan, err := NewPlan(cfg)
-	suite.Require().Nil(err)
-	suite.Equal(1, len(plan.steps))
+	stepOne.EXPECT().
+		Prepare(gomock.Any()).
+		Return(fmt.Errorf("I'm starry Dave, aye, cat blew that"))
 
-	suite.Require().IsType(&run.Help{}, plan.steps[0])
+	_, err := NewPlan(cfg)
+	suite.Require().NotNil(err)
+	suite.EqualError(err, "while preparing *helm.MockStep step: I'm starry Dave, aye, cat blew that")
+}
+
+func (suite *PlanTestSuite) TestUpgrade() {
+	cfg := Config{
+		KubeToken:      "cXVlZXIgY2hhcmFjdGVyCg==",
+		SkipTLSVerify:  true,
+		Certificate:    "b2Ygd29rZW5lc3MK",
+		APIServer:      "123.456.78.9",
+		ServiceAccount: "helmet",
+		ChartVersion:   "seventeen",
+		Wait:           true,
+		ReuseValues:    true,
+		Timeout:        "go sit in the corner",
+		Chart:          "billboard_top_100",
+		Release:        "post_malone_circles",
+		Force:          true,
+	}
+
+	steps := upgrade(cfg)
+
+	suite.Equal(2, len(steps))
+
+	suite.Require().IsType(&run.InitKube{}, steps[0])
+	init, _ := steps[0].(*run.InitKube)
+
+	var expected Step = &run.InitKube{
+		SkipTLSVerify:  cfg.SkipTLSVerify,
+		Certificate:    cfg.Certificate,
+		APIServer:      cfg.APIServer,
+		ServiceAccount: cfg.ServiceAccount,
+		Token:          cfg.KubeToken,
+		TemplateFile:   kubeConfigTemplate,
+	}
+
+	suite.Equal(expected, init)
+
+	suite.Require().IsType(&run.Upgrade{}, steps[1])
+	upgrade, _ := steps[1].(*run.Upgrade)
+
+	expected = &run.Upgrade{
+		Chart:        cfg.Chart,
+		Release:      cfg.Release,
+		ChartVersion: cfg.ChartVersion,
+		Wait:         cfg.Wait,
+		ReuseValues:  cfg.ReuseValues,
+		Timeout:      cfg.Timeout,
+		Force:        cfg.Force,
+	}
+
+	suite.Equal(expected, upgrade)
+}
+
+func (suite *PlanTestSuite) TestDeterminePlanUpgradeCommand() {
+	cfg := Config{
+		Command: "upgrade",
+	}
+	stepsMaker := determineSteps(cfg)
+	suite.Same(&upgrade, stepsMaker)
+}
+
+func (suite *PlanTestSuite) TestDeterminePlanUpgradeFromDroneEvent() {
+	cfg := Config{}
+
+	upgradeEvents := []string{"push", "tag", "deployment", "pull_request", "promote", "rollback"}
+	for _, event := range upgradeEvents {
+		cfg.DroneEvent = event
+		stepsMaker := determineSteps(cfg)
+		suite.Same(&upgrade, stepsMaker, fmt.Sprintf("for event type '%s'", event))
+	}
+}
+
+func (suite *PlanTestSuite) TestDeterminePlanHelpCommand() {
+	cfg := Config{
+		Command: "help",
+	}
+
+	stepsMaker := determineSteps(cfg)
+	suite.Same(&help, stepsMaker)
 }

internal/run/config.go

@@ -6,17 +6,12 @@ import (
 
 // Config contains configuration applicable to all helm commands
 type Config struct {
-	Debug          bool
-	KubeConfig     string
-	Values         string
-	StringValues   string
-	ValuesFiles    []string
-	Namespace      string
-	Token          string
-	SkipTLSVerify  bool
-	Certificate    string
-	APIServer      string
-	ServiceAccount string
-	Stdout         io.Writer
-	Stderr         io.Writer
+	Debug        bool
+	KubeConfig   string
+	Values       string
+	StringValues string
+	ValuesFiles  []string
+	Namespace    string
+	Stdout       io.Writer
+	Stderr       io.Writer
 }

internal/run/help.go

@@ -10,7 +10,7 @@ type Help struct {
 }
 
 // Execute executes the `helm help` command.
-func (h *Help) Execute() error {
+func (h *Help) Execute(_ Config) error {
 	return h.cmd.Run()
 }
 

internal/run/help_test.go

@@ -50,7 +50,7 @@ func (suite *HelpTestSuite) TestPrepare() {
 	h := Help{}
 	err := h.Prepare(cfg)
 	suite.Require().Nil(err)
-	h.Execute()
+	h.Execute(cfg)
 }
 
 func (suite *HelpTestSuite) TestPrepareDebugFlag() {

internal/run/initkube.go

@@ -0,0 +1,93 @@
+package run
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"text/template"
+)
+
+// InitKube is a step in a helm Plan that initializes the kubernetes config file.
+type InitKube struct {
+	SkipTLSVerify  bool
+	Certificate    string
+	APIServer      string
+	ServiceAccount string
+	Token          string
+	TemplateFile   string
+
+	template   *template.Template
+	configFile io.WriteCloser
+	values     kubeValues
+}
+
+type kubeValues struct {
+	SkipTLSVerify  bool
+	Certificate    string
+	APIServer      string
+	Namespace      string
+	ServiceAccount string
+	Token          string
+}
+
+// Execute generates a kubernetes config file from drone-helm3's template.
+func (i *InitKube) Execute(cfg Config) error {
+	if cfg.Debug {
+		fmt.Fprintf(cfg.Stderr, "writing kubeconfig file to %s\n", cfg.KubeConfig)
+	}
+	defer i.configFile.Close()
+	return i.template.Execute(i.configFile, i.values)
+}
+
+// Prepare ensures all required configuration is present and that the config file is writable.
+func (i *InitKube) Prepare(cfg Config) error {
+	var err error
+
+	if i.APIServer == "" {
+		return errors.New("an API Server is needed to deploy")
+	}
+	if i.Token == "" {
+		return errors.New("token is needed to deploy")
+	}
+	if i.Certificate == "" && !i.SkipTLSVerify {
+		return errors.New("certificate is needed to deploy")
+	}
+
+	if i.ServiceAccount == "" {
+		i.ServiceAccount = "helm"
+	}
+
+	if cfg.Debug {
+		fmt.Fprintf(cfg.Stderr, "loading kubeconfig template from %s\n", i.TemplateFile)
+	}
+	i.template, err = template.ParseFiles(i.TemplateFile)
+	if err != nil {
+		return fmt.Errorf("could not load kubeconfig template: %w", err)
+	}
+
+	i.values = kubeValues{
+		SkipTLSVerify:  i.SkipTLSVerify,
+		Certificate:    i.Certificate,
+		APIServer:      i.APIServer,
+		ServiceAccount: i.ServiceAccount,
+		Token:          i.Token,
+		Namespace:      cfg.Namespace,
+	}
+
+	if cfg.Debug {
+		if _, err := os.Stat(cfg.KubeConfig); err != nil {
+			// non-nil err here isn't an actual error state; the kubeconfig just doesn't exist
+			fmt.Fprint(cfg.Stderr, "creating ")
+		} else {
+			fmt.Fprint(cfg.Stderr, "truncating ")
+		}
+		fmt.Fprintf(cfg.Stderr, "kubeconfig file at %s\n", cfg.KubeConfig)
+	}
+
+	i.configFile, err = os.Create(cfg.KubeConfig)
+	if err != nil {
+		return fmt.Errorf("could not open kubeconfig file for writing: %w", err)
+	}
+	return nil
+}

internal/run/initkube_test.go

@@ -0,0 +1,184 @@
+package run
+
+import (
+	"io/ioutil"
+	"os"
+	"text/template"
+	// "github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/suite"
+	"testing"
+)
+
+type InitKubeTestSuite struct {
+	suite.Suite
+}
+
+func TestInitKubeTestSuite(t *testing.T) {
+	suite.Run(t, new(InitKubeTestSuite))
+}
+
+func (suite *InitKubeTestSuite) TestPrepareExecute() {
+	templateFile, err := tempfile("kubeconfig********.yml.tpl", `
+certificate: {{ .Certificate }}
+namespace: {{ .Namespace }}
+`)
+	defer os.Remove(templateFile.Name())
+	suite.Require().Nil(err)
+
+	configFile, err := tempfile("kubeconfig********.yml", "")
+	defer os.Remove(configFile.Name())
+	suite.Require().Nil(err)
+
+	init := InitKube{
+		APIServer:    "Sysadmin",
+		Certificate:  "CCNA",
+		Token:        "Aspire virtual currency",
+		TemplateFile: templateFile.Name(),
+	}
+	cfg := Config{
+		Namespace:  "Cisco",
+		KubeConfig: configFile.Name(),
+	}
+	err = init.Prepare(cfg)
+	suite.Require().Nil(err)
+
+	suite.IsType(&template.Template{}, init.template)
+	suite.NotNil(init.configFile)
+
+	err = init.Execute(cfg)
+	suite.Require().Nil(err)
+
+	conf, err := ioutil.ReadFile(configFile.Name())
+	suite.Require().Nil(err)
+
+	want := `
+certificate: CCNA
+namespace: Cisco
+`
+	suite.Equal(want, string(conf))
+}
+
+func (suite *InitKubeTestSuite) TestPrepareParseError() {
+	templateFile, err := tempfile("kubeconfig********.yml.tpl", `{{ NonexistentFunction }}`)
+	defer os.Remove(templateFile.Name())
+	suite.Require().Nil(err)
+
+	init := InitKube{
+		APIServer:    "Sysadmin",
+		Certificate:  "CCNA",
+		Token:        "Aspire virtual currency",
+		TemplateFile: templateFile.Name(),
+	}
+	err = init.Prepare(Config{})
+	suite.Error(err)
+	suite.Regexp("could not load kubeconfig .* function .* not defined", err)
+}
+
+func (suite *InitKubeTestSuite) TestPrepareNonexistentTemplateFile() {
+	init := InitKube{
+		APIServer:    "Sysadmin",
+		Certificate:  "CCNA",
+		Token:        "Aspire virtual currency",
+		TemplateFile: "/usr/foreign/exclude/kubeprofig.tpl",
+	}
+	err := init.Prepare(Config{})
+	suite.Error(err)
+	suite.Regexp("could not load kubeconfig .* no such file or directory", err)
+}
+
+func (suite *InitKubeTestSuite) TestPrepareCannotOpenDestinationFile() {
+	templateFile, err := tempfile("kubeconfig********.yml.tpl", "hurgity burgity")
+	defer os.Remove(templateFile.Name())
+	suite.Require().Nil(err)
+	init := InitKube{
+		APIServer:    "Sysadmin",
+		Certificate:  "CCNA",
+		Token:        "Aspire virtual currency",
+		TemplateFile: templateFile.Name(),
+	}
+
+	cfg := Config{
+		KubeConfig: "/usr/foreign/exclude/kubeprofig",
+	}
+	err = init.Prepare(cfg)
+	suite.Error(err)
+	suite.Regexp("could not open .* for writing: .* no such file or directory", err)
+}
+
+func (suite *InitKubeTestSuite) TestPrepareRequiredConfig() {
+	templateFile, err := tempfile("kubeconfig********.yml.tpl", "hurgity burgity")
+	defer os.Remove(templateFile.Name())
+	suite.Require().Nil(err)
+
+	configFile, err := tempfile("kubeconfig********.yml", "")
+	defer os.Remove(configFile.Name())
+	suite.Require().Nil(err)
+
+	// initial config with all required fields present
+	init := InitKube{
+		APIServer:    "Sysadmin",
+		Certificate:  "CCNA",
+		Token:        "Aspire virtual currency",
+		TemplateFile: templateFile.Name(),
+	}
+
+	cfg := Config{
+		KubeConfig: configFile.Name(),
+	}
+
+	suite.NoError(init.Prepare(cfg)) // consistency check; we should be starting in a happy state
+
+	init.APIServer = ""
+	suite.Error(init.Prepare(cfg), "APIServer should be required.")
+
+	init.APIServer = "Sysadmin"
+	init.Token = ""
+	suite.Error(init.Prepare(cfg), "Token should be required.")
+
+	init.Token = "Aspire virtual currency"
+	init.Certificate = ""
+	suite.Error(init.Prepare(cfg), "Certificate should be required.")
+
+	init.SkipTLSVerify = true
+	suite.NoError(init.Prepare(cfg), "Certificate should not be required if SkipTLSVerify is true")
+}
+
+func (suite *InitKubeTestSuite) TestPrepareDefaultsServiceAccount() {
+	templateFile, err := tempfile("kubeconfig********.yml.tpl", "hurgity burgity")
+	defer os.Remove(templateFile.Name())
+	suite.Require().Nil(err)
+
+	configFile, err := tempfile("kubeconfig********.yml", "")
+	defer os.Remove(configFile.Name())
+	suite.Require().Nil(err)
+
+	init := InitKube{
+		APIServer:    "Sysadmin",
+		Certificate:  "CCNA",
+		Token:        "Aspire virtual currency",
+		TemplateFile: templateFile.Name(),
+	}
+
+	cfg := Config{
+		KubeConfig: configFile.Name(),
+	}
+
+	init.Prepare(cfg)
+	suite.Equal("helm", init.ServiceAccount)
+}
+
+func tempfile(name, contents string) (*os.File, error) {
+	file, err := ioutil.TempFile("", name)
+	if err != nil {
+		return nil, err
+	}
+	_, err = file.Write([]byte(contents))
+	if err != nil {
+		return nil, err
+	}
+	err = file.Close()
+	if err != nil {
+		return nil, err
+	}
+	return file, nil
+}

internal/run/upgrade.go

@@ -19,13 +19,19 @@ type Upgrade struct {
 }
 
 // Execute executes the `helm upgrade` command.
-func (u *Upgrade) Execute() error {
+func (u *Upgrade) Execute(_ Config) error {
 	return u.cmd.Run()
 }
 
 // Prepare gets the Upgrade ready to execute.
 func (u *Upgrade) Prepare(cfg Config) error {
-	args := []string{"upgrade", "--install", u.Release, u.Chart}
+	args := []string{"--kubeconfig", cfg.KubeConfig}
+
+	if cfg.Namespace != "" {
+		args = append(args, "--namespace", cfg.Namespace)
+	}
+
+	args = append(args, "upgrade", "--install", u.Release, u.Chart)
 
 	if cfg.Debug {
 		args = append([]string{"--debug"}, args...)

internal/run/upgrade_test.go

@@ -41,7 +41,8 @@ func (suite *UpgradeTestSuite) TestPrepare() {
 
 	command = func(path string, args ...string) cmd {
 		suite.Equal(helmBin, path)
-		suite.Equal([]string{"upgrade", "--install", "jonas_brothers_only_human", "at40"}, args)
+		suite.Equal([]string{"--kubeconfig", "/root/.kube/config", "upgrade", "--install",
+			"jonas_brothers_only_human", "at40"}, args)
 
 		return suite.mockCmd
 	}
@@ -54,9 +55,44 @@ func (suite *UpgradeTestSuite) TestPrepare() {
 		Run().
 		Times(1)
 
-	err := u.Prepare(Config{})
+	cfg := Config{
+		KubeConfig: "/root/.kube/config",
+	}
+	err := u.Prepare(cfg)
 	suite.Require().Nil(err)
-	u.Execute()
+	u.Execute(cfg)
+}
+
+func (suite *UpgradeTestSuite) TestPrepareNamespaceFlag() {
+	defer suite.ctrl.Finish()
+
+	u := Upgrade{
+		Chart:   "at40",
+		Release: "shaed_trampoline",
+	}
+
+	command = func(path string, args ...string) cmd {
+		suite.Equal(helmBin, path)
+		suite.Equal([]string{"--kubeconfig", "/root/.kube/config", "--namespace", "melt", "upgrade",
+			"--install", "shaed_trampoline", "at40"}, args)
+
+		return suite.mockCmd
+	}
+
+	suite.mockCmd.EXPECT().
+		Stdout(gomock.Any())
+	suite.mockCmd.EXPECT().
+		Stderr(gomock.Any())
+	suite.mockCmd.EXPECT().
+		Run()
+
+	cfg := Config{
+		Namespace:  "melt",
+		KubeConfig: "/root/.kube/config",
+	}
+	err := u.Prepare(cfg)
+	suite.Require().Nil(err)
+	u.Execute(cfg)
 }
 
 func (suite *UpgradeTestSuite) TestPrepareDebugFlag() {
@@ -68,9 +104,10 @@ func (suite *UpgradeTestSuite) TestPrepareDebugFlag() {
 	stdout := strings.Builder{}
 	stderr := strings.Builder{}
 	cfg := Config{
-		Debug:  true,
-		Stdout: &stdout,
-		Stderr: &stderr,
+		Debug:      true,
+		KubeConfig: "/root/.kube/config",
+		Stdout:     &stdout,
+		Stderr:     &stderr,
 	}
 
 	command = func(path string, args ...string) cmd {
@@ -88,7 +125,8 @@ func (suite *UpgradeTestSuite) TestPrepareDebugFlag() {
 
 	u.Prepare(cfg)
 
-	want := fmt.Sprintf("Generated command: '%s --debug upgrade --install lewis_capaldi_someone_you_loved at40'\n", helmBin)
+	want := fmt.Sprintf("Generated command: '%s --debug --kubeconfig /root/.kube/config upgrade "+
+		"--install lewis_capaldi_someone_you_loved at40'\n", helmBin)
 	suite.Equal(want, stderr.String())
 	suite.Equal("", stdout.String())
 }

kubeconfig

@@ -0,0 +1,39 @@
+apiVersion: v1
+clusters:
+- cluster:
+{{- if eq .SkipTLSVerify true }}
+    insecure-skip-tls-verify: true
+{{- else }}
+    certificate-authority-data: {{ .Certificate }}
+{{- end}}
+    server: {{ .APIServer }}
+  name: helm
+contexts:
+- context:
+    cluster: helm
+{{- if .Namespace }}
+    namespace: {{ .Namespace }}
+{{- end }}
+    user: {{ .ServiceAccount }}
+  name: helm
+current-context: "helm"
+kind: Config
+preferences: {}
+users:
+- name: {{ .ServiceAccount }}
+  user:
+{{- if .Token }}
+    token: {{ .Token }}
+{{- else if .EKSCluster }}
+    exec:
+      apiVersion: client.authentication.k8s.io/v1alpha1
+      command: aws-iam-authenticator
+      args:
+        - "token"
+        - "-i"
+        - "{{ .EKSCluster }}"
+    {{- if .EKSRoleARN }}
+        - "-r"
+        - "{{ .EKSRoleARN }}"
+    {{- end }}
+{{- end }}