Merge pull request #49 from pelotech/helm-repos

Call `helm repo add` when instructed

.github/CODEOWNERS

@@ -0,0 +1 @@
+*       @erincall @grinnellian @kav @josmo

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,17 @@
+---
+name: Bug report
+about: Unexpected or broken behavior
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**What I tried to do:**
+<!-- e.g. run a helm installation -->
+
+**What happened:**
+<!-- describe the faulty behavior -->
+
+**More info:**
+<!-- contents of .drone.yml, etc. -->

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,14 @@
+---
+name: Feature request
+about: Suggest a new feature
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**The problem I'm trying to solve:**
+<!-- describe what you'd like to be able to accomplish -->
+
+**How I imagine it working:**
+<!-- e.g. configuration that could go in .drone.yml -->

.github/pull_request_template.md

@@ -0,0 +1,8 @@
+**Please replace this line with "fixes #ISSUE_NUMBER" (or "relates to #ISSUE_NUMBER", if it is not a complete fix)**
+
+Pre-merge checklist:
+
+* [ ] Code changes have tests
+* [ ] Any changes to the config are documented in `docs/parameter_reference.md`
+* [ ] Any new _required_ config is documented in `README.md`
+* [ ] Any large changes have been verified by running a Drone job

.gitignore

@@ -13,3 +13,5 @@
 
 # Dependency directories (remove the comment below to include it)
 # vendor/
+.env
+.secrets

CODE_OF_CONDUCT.md

@@ -0,0 +1,76 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to making participation in our project and
+our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, sex characteristics, gender identity and expression,
+level of experience, education, socio-economic status, nationality, personal
+appearance, race, religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment
+include:
+
+* Using welcoming and inclusive language
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+* Focusing on what is best for the community
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+
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+Project maintainers who do not follow or enforce the Code of Conduct in good
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+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
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+
+[homepage]: https://www.contributor-covenant.org
+
+For answers to common questions about this code of conduct, see
+https://www.contributor-covenant.org/faq

LICENSE

@@ -0,0 +1,202 @@
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cmd/drone-helm/main.go

@@ -27,7 +27,7 @@ func main() {
 
 	// Expect the plan to go off the rails
 	if err != nil {
-		fmt.Fprintf(os.Stderr, err.Error())
+		fmt.Fprintf(os.Stderr, "%s\n", err.Error())
 		// Throw away the plan
 		os.Exit(1)
 	}

docs/contributing.md

@@ -0,0 +1,48 @@
+# Contributing to drone-helm3
+
+We're glad you're interested in contributing! Here are some guidelines that will help make sure everyone has a good experience:
+
+## Submitting a patch
+
+Before you start working on a change, please make sure there's an associated issue. It doesn't need to be thoroughly scrutinized and dissected, but it needs to exist.
+
+Please put the relevant issue number in the first line of your commit messages, e.g. `vorpalize the frabjulator [#42]`. Branch names do not need issue numbers, but feel free to include them if you like.
+
+We encourage you to follow [the guidelines in Pro Git](https://git-scm.com/book/en/v2/Distributed-Git-Contributing-to-a-Project#_commit_guidelines) when making commits. In short:
+
+* Commit early and commit often.
+* Make the first line of the commit message concise--no more than 50 characters or so.
+* Make the rest of the commit message verbose--information about _why_ you did what you did is particularly helpful.
+
+Once you're satisfied with your work, send us a pull request. If you'd like, you can send the pull request _before_ you're satisfied with your work; just be sure to mark the PR a draft or put `[WIP]` in the title.
+
+## How to run the tests
+
+We use `go test`, `go vet`, and `golint`:
+
+```
+go test ./cmd/... ./internal/...
+go vet ./cmd/... ./internal/...
+golint -set_exit_status ./cmd/... ./internal/...
+```
+
+If you have [the Drone cli tool](https://docs.drone.io/cli/install/) installed, you can also use `drone exec --include test --include lint`.
+
+## Testing the plugin end-to-end
+
+Although we aim to make the internal tests as thorough as possible, they can't test drone-helm3's integration with drone and helm themselves. However, you can test a change manually by building an image and running it with a fixture repository.
+
+You will need:
+
+* Access to a docker image registry. This document assumes you'll use [Docker Hub](https://hub.docker.com).
+* [The Drone cli tool](https://docs.drone.io/cli/install/).
+* A fixture repository--a directory with a `.drone.yml` and a helm chart. If you don't have one handy, try adding a `.drone.yml` to a chart from [Helm's "stable" repository](https://github.com/helm/charts/tree/master/stable/).
+* Access to a kubernetes cluster (unless `lint` or `dry_run` is sufficient for your purposes).
+
+Once you have what you need, you can publish and consume an image with your changes:
+
+1. [Create a repository on Docker Hub](https://hub.docker.com/repository/create). This document assumes you've called it drone-helm3-testing.
+1. Create a `.secrets` file with your docker credentials (see [example.secrets](./example.secrets) for an example). While you can use your Docker Hub password, it's better to [generate an access token](https://hub.docker.com/settings/security) and use that instead.
+1. Use Drone to build and publish an image with your changes: `drone exec --secret-file ./secrets --event push`
+1. In the `.drone.yml` of your fixture repository, set the `image` for each relevant stanza to `your_dockerhub_username/drone-helm3-testing`
+1. Use `drone exec` in the fixture repo to verify your changes.

docs/example.secrets

@@ -0,0 +1,3 @@
+DOCKER_PASSWORD=your_access_token
+DOCKER_USERNAME=your_dockerhub_username
+PLUGIN_REPO=your_dockerhub_username/drone-helm3-testing

docs/parameter_reference.md

@@ -4,10 +4,10 @@
 | Param name          | Type            | Purpose |
 |---------------------|-----------------|---------|
 | helm_command        | string          | Indicates the operation to perform. Recommended, but not required. Valid options are `upgrade`, `uninstall`, `lint`, and `help`. |
-| update_dependencies | boolean         | Calls `helm dependency update` before running the main command. **Not currently implemented**; see [#25](https://github.com/pelotech/drone-helm3/issues/25).|
+| update_dependencies | boolean         | Calls `helm dependency update` before running the main command.|
-| helm_repos          | list\<string\>  | Calls `helm repo add $repo` before running the main command. Each string should be formatted as `repo_name=https://repo.url/`. **Not currently implemented**; see [#26](https://github.com/pelotech/drone-helm3/issues/26). |
+| helm_repos          | list\<string\>  | Calls `helm repo add $repo` before running the main command. Each string should be formatted as `repo_name=https://repo.url/`. |
 | namespace           | string          | Kubernetes namespace to use for this operation. |
-| prefix              | string          | Expect environment variables to be prefixed with the given string. For more details, see "Using the prefix setting" below. **Not currently implemented**; see [#19](https://github.com/pelotech/drone-helm3/issues/19). |
+| prefix              | string          | Expect environment variables to be prefixed with the given string. For more details, see "Using the prefix setting" below. |
 | debug               | boolean         | Generate debug output within drone-helm3 and pass `--debug` to all helm commands. Use with care, since the debug output may include secrets. |
 
 ## Linting
@@ -58,6 +58,7 @@ Uninstallations are triggered when the `helm_command` setting is "uninstall" or
 | dry_run                | boolean  |          | Pass `--dry-run` to `helm uninstall`. |
 | timeout                | duration |          | Timeout for any *individual* Kubernetes operation. The uninstallation's full runtime may exceed this duration. |
 | skip_tls_verify        | boolean  |          | Connect to the Kubernetes cluster without checking for a valid TLS certificate. Not recommended in production. |
+| chart                  | string   |          | Required when the global `update_dependencies` parameter is true. No effect otherwise. |
 
 ### Where to put settings
 
@@ -67,6 +68,7 @@ Any setting (with the exception of `prefix`; [see below](#user-content-using-the
 
 * Booleans can be yaml's `true` and `false` literals or the strings `"true"` and `"false"`.
 * Durations are strings formatted with the syntax accepted by [golang's ParseDuration function](https://golang.org/pkg/time/#ParseDuration) (e.g. 5m30s)
+  * For backward-compatibility with drone-helm, a duration can also be an integer, in which case it will be interpreted to mean seconds.
 * List\<string\>s can be a yaml sequence or a comma-separated string.
 
 All of the following are equivalent:

internal/helm/config.go

@@ -4,8 +4,11 @@ import (
 	"fmt"
 	"github.com/kelseyhightower/envconfig"
 	"io"
+	"regexp"
 )
 
+var justNumbers = regexp.MustCompile(`^\d+$`)
+
 // The Config struct captures the `settings` and `environment` blocks in the application's drone
 // config. Configuration in drone's `settings` block arrives as uppercase env vars matching the
 // config key, prefixed with `PLUGIN_`. Config from the `environment` block is uppercased, but does
@@ -15,7 +18,7 @@ type Config struct {
 	Command            string   `envconfig:"HELM_COMMAND"`           // Helm command to run
 	DroneEvent         string   `envconfig:"DRONE_BUILD_EVENT"`      // Drone event that invoked this plugin.
 	UpdateDependencies bool     `split_words:"true"`                 // Call `helm dependency update` before the main command
-	Repos              []string `envconfig:"HELM_REPOS"`             // Call `helm repo add` before the main command
+	AddRepos           []string `envconfig:"HELM_REPOS"`             // Call `helm repo add` before the main command
 	Prefix             string   ``                                   // Prefix to use when looking up secret env vars
 	Debug              bool     ``                                   // Generate debug output and pass --debug to all helm commands
 	Values             string   ``                                   // Argument to pass to --set in applicable helm commands
@@ -62,6 +65,10 @@ func NewConfig(stdout, stderr io.Writer) (*Config, error) {
 		}
 	}
 
+	if justNumbers.MatchString(cfg.Timeout) {
+		cfg.Timeout = fmt.Sprintf("%ss", cfg.Timeout)
+	}
+
 	if cfg.Debug && cfg.Stderr != nil {
 		cfg.logDebug()
 	}

internal/helm/config_test.go

@@ -106,6 +106,13 @@ func (suite *ConfigTestSuite) TestNewConfigWithConflictingVariables() {
 	suite.Equal("2m30s", cfg.Timeout)
 }
 
+func (suite *ConfigTestSuite) TestNewConfigInfersNumbersAreSeconds() {
+	suite.setenv("PLUGIN_TIMEOUT", "42")
+	cfg, err := NewConfig(&strings.Builder{}, &strings.Builder{})
+	suite.Require().NoError(err)
+	suite.Equal("42s", cfg.Timeout)
+}
+
 func (suite *ConfigTestSuite) TestNewConfigSetsWriters() {
 	stdout := &strings.Builder{}
 	stderr := &strings.Builder{}

internal/helm/plan.go

@@ -69,13 +69,12 @@ func determineSteps(cfg Config) *func(Config) []Step {
 		return &help
 	default:
 		switch cfg.DroneEvent {
-		// Note: These events are documented in docs/upgrade_settings.yml. Any changes here should be reflected there.
 		case "push", "tag", "deployment", "pull_request", "promote", "rollback":
 			return &upgrade
 		case "delete":
 			return &uninstall
 		default:
-			panic("not implemented")
+			return &help
 		}
 	}
 }
@@ -97,7 +96,10 @@ func (p *Plan) Execute() error {
 
 var upgrade = func(cfg Config) []Step {
 	steps := initKube(cfg)
-
+	steps = append(steps, addRepos(cfg)...)
+	if cfg.UpdateDependencies {
+		steps = append(steps, depUpdate(cfg)...)
+	}
 	steps = append(steps, &run.Upgrade{
 		Chart:        cfg.Chart,
 		Release:      cfg.Release,
@@ -114,6 +116,9 @@ var upgrade = func(cfg Config) []Step {
 
 var uninstall = func(cfg Config) []Step {
 	steps := initKube(cfg)
+	if cfg.UpdateDependencies {
+		steps = append(steps, depUpdate(cfg)...)
+	}
 	steps = append(steps, &run.Uninstall{
 		Release: cfg.Release,
 		DryRun:  cfg.DryRun,
@@ -123,15 +128,21 @@ var uninstall = func(cfg Config) []Step {
 }
 
 var lint = func(cfg Config) []Step {
-	lint := &run.Lint{
+	steps := addRepos(cfg)
-		Chart: cfg.Chart,
+	if cfg.UpdateDependencies {
+		steps = append(steps, depUpdate(cfg)...)
 	}
+	steps = append(steps, &run.Lint{
+		Chart: cfg.Chart,
+	})
 
-	return []Step{lint}
+	return steps
 }
 
 var help = func(cfg Config) []Step {
-	help := &run.Help{}
+	help := &run.Help{
+		HelmCommand: cfg.Command,
+	}
 	return []Step{help}
 }
 
@@ -148,3 +159,22 @@ func initKube(cfg Config) []Step {
 		},
 	}
 }
+
+func addRepos(cfg Config) []Step {
+	steps := make([]Step, 0)
+	for _, repo := range cfg.AddRepos {
+		steps = append(steps, &run.AddRepo{
+			Repo: repo,
+		})
+	}
+
+	return steps
+}
+
+func depUpdate(cfg Config) []Step {
+	return []Step{
+		&run.DepUpdate{
+			Chart: cfg.Chart,
+		},
+	}
+}

internal/helm/plan_test.go

@@ -167,7 +167,28 @@ func (suite *PlanTestSuite) TestUpgrade() {
 	suite.Equal(expected, upgrade)
 }
 
-func (suite *PlanTestSuite) TestDel() {
+func (suite *PlanTestSuite) TestUpgradeWithUpdateDependencies() {
+	cfg := Config{
+		UpdateDependencies: true,
+	}
+	steps := upgrade(cfg)
+	suite.Require().Equal(3, len(steps), "upgrade should have a third step when DepUpdate is true")
+	suite.IsType(&run.InitKube{}, steps[0])
+	suite.IsType(&run.DepUpdate{}, steps[1])
+}
+
+func (suite *PlanTestSuite) TestUpgradeWithAddRepos() {
+	cfg := Config{
+		AddRepos: []string{
+			"machine=https://github.com/harold_finch/themachine",
+		},
+	}
+	steps := upgrade(cfg)
+	suite.Require().True(len(steps) > 1, "upgrade should generate at least two steps")
+	suite.IsType(&run.AddRepo{}, steps[1])
+}
+
+func (suite *PlanTestSuite) TestUninstall() {
 	cfg := Config{
 		KubeToken:      "b2YgbXkgYWZmZWN0aW9u",
 		SkipTLSVerify:  true,
@@ -205,6 +226,16 @@ func (suite *PlanTestSuite) TestDel() {
 	suite.Equal(expected, actual)
 }
 
+func (suite *PlanTestSuite) TestUninstallWithUpdateDependencies() {
+	cfg := Config{
+		UpdateDependencies: true,
+	}
+	steps := uninstall(cfg)
+	suite.Require().Equal(3, len(steps), "uninstall should have a third step when DepUpdate is true")
+	suite.IsType(&run.InitKube{}, steps[0])
+	suite.IsType(&run.DepUpdate{}, steps[1])
+}
+
 func (suite *PlanTestSuite) TestInitKube() {
 	cfg := Config{
 		KubeToken:      "cXVlZXIgY2hhcmFjdGVyCg==",
@@ -231,6 +262,41 @@ func (suite *PlanTestSuite) TestInitKube() {
 	suite.Equal(expected, init)
 }
 
+func (suite *PlanTestSuite) TestDepUpdate() {
+	cfg := Config{
+		UpdateDependencies: true,
+		Chart:              "scatterplot",
+	}
+
+	steps := depUpdate(cfg)
+	suite.Require().Equal(1, len(steps), "depUpdate should return one step")
+	suite.Require().IsType(&run.DepUpdate{}, steps[0])
+	update, _ := steps[0].(*run.DepUpdate)
+
+	expected := &run.DepUpdate{
+		Chart: "scatterplot",
+	}
+	suite.Equal(expected, update)
+}
+
+func (suite *PlanTestSuite) TestAddRepos() {
+	cfg := Config{
+		AddRepos: []string{
+			"first=https://add.repos/one",
+			"second=https://add.repos/two",
+		},
+	}
+	steps := addRepos(cfg)
+	suite.Require().Equal(2, len(steps), "addRepos should add one step per repo")
+	suite.Require().IsType(&run.AddRepo{}, steps[0])
+	suite.Require().IsType(&run.AddRepo{}, steps[1])
+	first := steps[0].(*run.AddRepo)
+	second := steps[1].(*run.AddRepo)
+
+	suite.Equal(first.Repo, "first=https://add.repos/one")
+	suite.Equal(second.Repo, "second=https://add.repos/two")
+}
+
 func (suite *PlanTestSuite) TestLint() {
 	cfg := Config{
 		Chart: "./flow",
@@ -245,6 +311,24 @@ func (suite *PlanTestSuite) TestLint() {
 	suite.Equal(want, steps[0])
 }
 
+func (suite *PlanTestSuite) TestLintWithUpdateDependencies() {
+	cfg := Config{
+		UpdateDependencies: true,
+	}
+	steps := lint(cfg)
+	suite.Require().Equal(2, len(steps), "lint should have a second step when DepUpdate is true")
+	suite.IsType(&run.DepUpdate{}, steps[0])
+}
+
+func (suite *PlanTestSuite) TestLintWithAddRepos() {
+	cfg := Config{
+		AddRepos: []string{"friendczar=https://github.com/logan_pierce/friendczar"},
+	}
+	steps := lint(cfg)
+	suite.Require().True(len(steps) > 0, "lint should return at least one step")
+	suite.IsType(&run.AddRepo{}, steps[0])
+}
+
 func (suite *PlanTestSuite) TestDeterminePlanUpgradeCommand() {
 	cfg := Config{
 		Command: "upgrade",

internal/run/addrepo.go

@@ -0,0 +1,52 @@
+package run
+
+import (
+	"fmt"
+	"strings"
+)
+
+// AddRepo is an execution step that calls `helm repo add` when executed.
+type AddRepo struct {
+	Repo string
+	cmd  cmd
+}
+
+// Execute executes the `helm repo add` command.
+func (a *AddRepo) Execute(_ Config) error {
+	return a.cmd.Run()
+}
+
+// Prepare gets the AddRepo ready to execute.
+func (a *AddRepo) Prepare(cfg Config) error {
+	if a.Repo == "" {
+		return fmt.Errorf("repo is required")
+	}
+	split := strings.SplitN(a.Repo, "=", 2)
+	if len(split) != 2 {
+		return fmt.Errorf("bad repo spec '%s'", a.Repo)
+	}
+
+	name := split[0]
+	url := split[1]
+
+	args := make([]string, 0)
+
+	if cfg.Namespace != "" {
+		args = append(args, "--namespace", cfg.Namespace)
+	}
+	if cfg.Debug {
+		args = append(args, "--debug")
+	}
+
+	args = append(args, "repo", "add", name, url)
+
+	a.cmd = command(helmBin, args...)
+	a.cmd.Stdout(cfg.Stdout)
+	a.cmd.Stderr(cfg.Stderr)
+
+	if cfg.Debug {
+		fmt.Fprintf(cfg.Stderr, "Generated command: '%s'\n", a.cmd.String())
+	}
+
+	return nil
+}

internal/run/addrepo_test.go

@@ -0,0 +1,141 @@
+package run
+
+import (
+	"fmt"
+	"github.com/golang/mock/gomock"
+	"github.com/stretchr/testify/suite"
+	"strings"
+	"testing"
+)
+
+type AddRepoTestSuite struct {
+	suite.Suite
+	ctrl            *gomock.Controller
+	mockCmd         *Mockcmd
+	originalCommand func(string, ...string) cmd
+	commandPath     string
+	commandArgs     []string
+}
+
+func (suite *AddRepoTestSuite) BeforeTest(_, _ string) {
+	suite.ctrl = gomock.NewController(suite.T())
+	suite.mockCmd = NewMockcmd(suite.ctrl)
+
+	suite.originalCommand = command
+	command = func(path string, args ...string) cmd {
+		suite.commandPath = path
+		suite.commandArgs = args
+		return suite.mockCmd
+	}
+}
+
+func (suite *AddRepoTestSuite) AfterTest(_, _ string) {
+	suite.ctrl.Finish()
+	command = suite.originalCommand
+}
+
+func TestAddRepoTestSuite(t *testing.T) {
+	suite.Run(t, new(AddRepoTestSuite))
+}
+
+func (suite *AddRepoTestSuite) TestPrepareAndExecute() {
+	stdout := strings.Builder{}
+	stderr := strings.Builder{}
+	cfg := Config{
+		Stdout: &stdout,
+		Stderr: &stderr,
+	}
+	a := AddRepo{
+		Repo: "edeath=https://github.com/n_marks/e-death",
+	}
+
+	suite.mockCmd.EXPECT().
+		Stdout(&stdout).
+		Times(1)
+	suite.mockCmd.EXPECT().
+		Stderr(&stderr).
+		Times(1)
+
+	suite.Require().NoError(a.Prepare(cfg))
+	suite.Equal(helmBin, suite.commandPath)
+	suite.Equal([]string{"repo", "add", "edeath", "https://github.com/n_marks/e-death"}, suite.commandArgs)
+
+	suite.mockCmd.EXPECT().
+		Run().
+		Times(1)
+
+	suite.Require().NoError(a.Execute(cfg))
+
+}
+
+func (suite *AddRepoTestSuite) TestPrepareRepoIsRequired() {
+	// These aren't really expected, but allowing them gives clearer test-failure messages
+	suite.mockCmd.EXPECT().Stdout(gomock.Any()).AnyTimes()
+	suite.mockCmd.EXPECT().Stderr(gomock.Any()).AnyTimes()
+	cfg := Config{}
+	a := AddRepo{}
+
+	err := a.Prepare(cfg)
+	suite.EqualError(err, "repo is required")
+}
+
+func (suite *AddRepoTestSuite) TestPrepareMalformedRepo() {
+	a := AddRepo{
+		Repo: "dwim",
+	}
+	err := a.Prepare(Config{})
+	suite.EqualError(err, "bad repo spec 'dwim'")
+}
+
+func (suite *AddRepoTestSuite) TestPrepareWithEqualSignInURL() {
+	suite.mockCmd.EXPECT().Stdout(gomock.Any()).AnyTimes()
+	suite.mockCmd.EXPECT().Stderr(gomock.Any()).AnyTimes()
+	a := AddRepo{
+		Repo: "samaritan=https://github.com/arthur_claypool/samaritan?version=2.1",
+	}
+	suite.NoError(a.Prepare(Config{}))
+	suite.Contains(suite.commandArgs, "https://github.com/arthur_claypool/samaritan?version=2.1")
+}
+
+func (suite *AddRepoTestSuite) TestNamespaceFlag() {
+	suite.mockCmd.EXPECT().Stdout(gomock.Any()).AnyTimes()
+	suite.mockCmd.EXPECT().Stderr(gomock.Any()).AnyTimes()
+	cfg := Config{
+		Namespace: "alliteration",
+	}
+	a := AddRepo{
+		Repo: "edeath=https://github.com/theater_guy/e-death",
+	}
+
+	suite.NoError(a.Prepare(cfg))
+	suite.Equal(suite.commandPath, helmBin)
+	suite.Equal(suite.commandArgs, []string{"--namespace", "alliteration",
+		"repo", "add", "edeath", "https://github.com/theater_guy/e-death"})
+}
+
+func (suite *AddRepoTestSuite) TestDebugFlag() {
+	suite.mockCmd.EXPECT().Stdout(gomock.Any()).AnyTimes()
+	suite.mockCmd.EXPECT().Stderr(gomock.Any()).AnyTimes()
+
+	stderr := strings.Builder{}
+
+	command = func(path string, args ...string) cmd {
+		suite.mockCmd.EXPECT().
+			String().
+			Return(fmt.Sprintf("%s %s", path, strings.Join(args, " ")))
+
+		return suite.mockCmd
+	}
+
+	cfg := Config{
+		Debug:  true,
+		Stderr: &stderr,
+	}
+	a := AddRepo{
+		Repo: "edeath=https://github.com/the_bug/e-death",
+	}
+
+	suite.Require().NoError(a.Prepare(cfg))
+	suite.Equal(fmt.Sprintf("Generated command: '%s --debug "+
+		"repo add edeath https://github.com/the_bug/e-death'\n", helmBin), stderr.String())
+}

internal/run/depupdate.go

@@ -0,0 +1,44 @@
+package run
+
+import (
+	"fmt"
+)
+
+// DepUpdate is an execution step that calls `helm dependency update` when executed.
+type DepUpdate struct {
+	Chart string
+	cmd   cmd
+}
+
+// Execute executes the `helm upgrade` command.
+func (d *DepUpdate) Execute(_ Config) error {
+	return d.cmd.Run()
+}
+
+// Prepare gets the DepUpdate ready to execute.
+func (d *DepUpdate) Prepare(cfg Config) error {
+	if d.Chart == "" {
+		return fmt.Errorf("chart is required")
+	}
+
+	args := make([]string, 0)
+
+	if cfg.Namespace != "" {
+		args = append(args, "--namespace", cfg.Namespace)
+	}
+	if cfg.Debug {
+		args = append(args, "--debug")
+	}
+
+	args = append(args, "dependency", "update", d.Chart)
+
+	d.cmd = command(helmBin, args...)
+	d.cmd.Stdout(cfg.Stdout)
+	d.cmd.Stderr(cfg.Stderr)
+
+	if cfg.Debug {
+		fmt.Fprintf(cfg.Stderr, "Generated command: '%s'\n", d.cmd.String())
+	}
+
+	return nil
+}

internal/run/depupdate_test.go

@@ -0,0 +1,128 @@
+package run
+
+import (
+	"fmt"
+	"github.com/golang/mock/gomock"
+	"github.com/stretchr/testify/suite"
+	"strings"
+	"testing"
+)
+
+type DepUpdateTestSuite struct {
+	suite.Suite
+	ctrl            *gomock.Controller
+	mockCmd         *Mockcmd
+	originalCommand func(string, ...string) cmd
+}
+
+func (suite *DepUpdateTestSuite) BeforeTest(_, _ string) {
+	suite.ctrl = gomock.NewController(suite.T())
+	suite.mockCmd = NewMockcmd(suite.ctrl)
+
+	suite.originalCommand = command
+	command = func(path string, args ...string) cmd { return suite.mockCmd }
+}
+
+func (suite *DepUpdateTestSuite) AfterTest(_, _ string) {
+	command = suite.originalCommand
+}
+
+func TestDepUpdateTestSuite(t *testing.T) {
+	suite.Run(t, new(DepUpdateTestSuite))
+}
+
+func (suite *DepUpdateTestSuite) TestPrepareAndExecute() {
+	defer suite.ctrl.Finish()
+
+	stdout := strings.Builder{}
+	stderr := strings.Builder{}
+	cfg := Config{
+		Stdout: &stdout,
+		Stderr: &stderr,
+	}
+
+	command = func(path string, args ...string) cmd {
+		suite.Equal(helmBin, path)
+		suite.Equal([]string{"dependency", "update", "your_top_songs_2019"}, args)
+
+		return suite.mockCmd
+	}
+	suite.mockCmd.EXPECT().
+		Stdout(&stdout)
+	suite.mockCmd.EXPECT().
+		Stderr(&stderr)
+	suite.mockCmd.EXPECT().
+		Run().
+		Times(1)
+
+	d := DepUpdate{
+		Chart: "your_top_songs_2019",
+	}
+
+	suite.Require().NoError(d.Prepare(cfg))
+	suite.NoError(d.Execute(cfg))
+}
+
+func (suite *DepUpdateTestSuite) TestPrepareNamespaceFlag() {
+	defer suite.ctrl.Finish()
+
+	cfg := Config{
+		Namespace: "spotify",
+	}
+
+	command = func(path string, args ...string) cmd {
+		suite.Equal([]string{"--namespace", "spotify", "dependency", "update", "your_top_songs_2019"}, args)
+
+		return suite.mockCmd
+	}
+	suite.mockCmd.EXPECT().Stdout(gomock.Any()).AnyTimes()
+	suite.mockCmd.EXPECT().Stderr(gomock.Any()).AnyTimes()
+
+	d := DepUpdate{
+		Chart: "your_top_songs_2019",
+	}
+
+	suite.Require().NoError(d.Prepare(cfg))
+}
+
+func (suite *DepUpdateTestSuite) TestPrepareDebugFlag() {
+	defer suite.ctrl.Finish()
+
+	stdout := strings.Builder{}
+	stderr := strings.Builder{}
+	cfg := Config{
+		Debug:  true,
+		Stdout: &stdout,
+		Stderr: &stderr,
+	}
+
+	command = func(path string, args ...string) cmd {
+		suite.mockCmd.EXPECT().
+			String().
+			Return(fmt.Sprintf("%s %s", path, strings.Join(args, " ")))
+
+		return suite.mockCmd
+	}
+	suite.mockCmd.EXPECT().Stdout(gomock.Any()).AnyTimes()
+	suite.mockCmd.EXPECT().Stderr(gomock.Any()).AnyTimes()
+
+	d := DepUpdate{
+		Chart: "your_top_songs_2019",
+	}
+
+	suite.Require().NoError(d.Prepare(cfg))
+
+	want := fmt.Sprintf("Generated command: '%s --debug dependency update your_top_songs_2019'\n", helmBin)
+	suite.Equal(want, stderr.String())
+	suite.Equal("", stdout.String())
+}
+
+func (suite *DepUpdateTestSuite) TestPrepareChartRequired() {
+	d := DepUpdate{}
+
+	suite.mockCmd.EXPECT().Stdout(gomock.Any()).AnyTimes()
+	suite.mockCmd.EXPECT().Stderr(gomock.Any()).AnyTimes()
+
+	err := d.Prepare(Config{})
+	suite.EqualError(err, "chart is required")
+}

internal/run/help.go

@@ -6,12 +6,20 @@ import (
 
 // Help is a step in a helm Plan that calls `helm help`.
 type Help struct {
+	HelmCommand string
 	cmd         cmd
 }
 
 // Execute executes the `helm help` command.
-func (h *Help) Execute(_ Config) error {
+func (h *Help) Execute(cfg Config) error {
-	return h.cmd.Run()
+	if err := h.cmd.Run(); err != nil {
+		return fmt.Errorf("while running '%s': %w", h.cmd.String(), err)
+	}
+
+	if h.HelmCommand == "help" {
+		return nil
+	}
+	return fmt.Errorf("unknown command '%s'", h.HelmCommand)
 }
 
 // Prepare gets the Help ready to execute.

internal/run/help_test.go

@@ -38,9 +38,6 @@ func (suite *HelpTestSuite) TestPrepare() {
 		Stdout(&stdout)
 	mCmd.EXPECT().
 		Stderr(&stderr)
-	mCmd.EXPECT().
-		Run().
-		Times(1)
 
 	cfg := Config{
 		Stdout: &stdout,
@@ -49,8 +46,32 @@ func (suite *HelpTestSuite) TestPrepare() {
 
 	h := Help{}
 	err := h.Prepare(cfg)
-	suite.Require().Nil(err)
+	suite.NoError(err)
-	h.Execute(cfg)
+}
+
+func (suite *HelpTestSuite) TestExecute() {
+	ctrl := gomock.NewController(suite.T())
+	defer ctrl.Finish()
+	mCmd := NewMockcmd(ctrl)
+	originalCommand := command
+	command = func(_ string, _ ...string) cmd {
+		return mCmd
+	}
+	defer func() { command = originalCommand }()
+
+	mCmd.EXPECT().
+		Run().
+		Times(2)
+
+	cfg := Config{}
+	help := Help{
+		HelmCommand: "help",
+		cmd:         mCmd,
+	}
+	suite.NoError(help.Execute(cfg))
+
+	help.HelmCommand = "get down on friday"
+	suite.EqualError(help.Execute(cfg), "unknown command 'get down on friday'")
 }
 
 func (suite *HelpTestSuite) TestPrepareDebugFlag() {

internal/run/lint.go

@@ -16,8 +16,6 @@ func (l *Lint) Execute(_ Config) error {
 }
 
 // Prepare gets the Lint ready to execute.
-// Note: mandatory settings are documented in README.md, and the full list of settings is in docs/lint_settings.yml.
-// Any additions or deletions here should be reflected there.
 func (l *Lint) Prepare(cfg Config) error {
 	if l.Chart == "" {
 		return fmt.Errorf("chart is required")

internal/run/upgrade.go

@@ -25,8 +25,6 @@ func (u *Upgrade) Execute(_ Config) error {
 }
 
 // Prepare gets the Upgrade ready to execute.
-// Note: mandatory settings are documented in README.md, and the full list of settings is in docs/upgrade_settings.yml.
-// Any additions or deletions here should be reflected there.
 func (u *Upgrade) Prepare(cfg Config) error {
 	if u.Chart == "" {
 		return fmt.Errorf("chart is required")