Merge pull request #49 from pelotech/helm-repos

Call `helm repo add` when instructed

.drone.yml

@@ -17,11 +17,16 @@ steps:
     image: golang:1.13
     commands:
       - go build -o build/drone-helm cmd/drone-helm/main.go
-  - name: publish
+  - name: publish_linux_amd64
     image: plugins/docker
-    auto_tag: true
     settings:
+      auto_tag: true
+      username:
+        from_secret: docker_username
+      password:
+        from_secret: docker_password
+      repo:
+        from_secret: plugin_repo
       dockerfile: Dockerfile
-      registry: '192.168.0.17:5000'
-      repo: 192.168.0.17:5000/drone-helm3
-      insecure: true
+    when:
+      event: [ tag, push ]

.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
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or
+ advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic
+ address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+ professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable
+behavior and are expected to take appropriate and fair corrective action in
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+
+Project maintainers have the right and responsibility to remove, edit, or
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+that are not aligned to this Code of Conduct, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community. Examples of
+representing a project or community include using an official project e-mail
+address, posting via an official social media account, or acting as an appointed
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+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting the project team at [workwithus@pelo.tech](mailto:workwithus@pelo.tech). All
+complaints will be reviewed and investigated and will result in a response that
+is deemed necessary and appropriate to the circumstances. The project team is
+obligated to maintain confidentiality with regard to the reporter of an incident.
+Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good
+faith may face temporary or permanent repercussions as determined by other
+members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
+available at https://www.contributor-covenant.org/version/1/4/code-of-conduct.html
+
+[homepage]: https://www.contributor-covenant.org
+
+For answers to common questions about this code of conduct, see
+https://www.contributor-covenant.org/faq

Dockerfile

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

LICENSE

@@ -1,674 +1,202 @@
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-For more information on this, and how to apply and follow the GNU GPL, see
-<https://www.gnu.org/licenses/>.
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-the library.  If this is what you want to do, use the GNU Lesser General
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-<https://www.gnu.org/licenses/why-not-lgpl.html>.
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+   limitations under the License.

README.md

@@ -1,15 +1,71 @@
 # Drone plugin for Helm 3
 
-TODO:
+This plugin provides an interface between [Drone](https://drone.io/) and [Helm 3](https://github.com/kubernetes/helm):
 
-* [x] Make a `.drone.yml` that's sufficient for building an image
-* [x] Make a `Dockerfile` that's sufficient for launching the built image
-* [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
-* [x] Flesh out `helm upgrade` until it's capable of working
-* [ ] Implement config settings for `upgrade`
-* [ ] Implement `helm lint`
-* [ ] Implement `helm delete`
-* [ ] EKS support
-* [ ] Change `.drone.yml` to use a real docker registry
+* Lint your charts
+* Deploy your service
+* Delete your service
+
+The plugin is inpsired by [drone-helm](https://github.com/ipedrazas/drone-helm), which fills the same role for Helm 2. It provides a comparable feature-set and the configuration settings are backwards-compatible.
+
+## Example configuration
+
+The examples below give a minimal and sufficient configuration for each use-case. For a full description of each command's settings, see [docs/parameter_reference.md](docs/parameter_reference.md).
+
+### Linting
+
+```yaml
+steps:
+  - name: lint
+    image: pelotech/drone-helm3
+    settings:
+      helm_command: lint
+      chart: ./
+```
+
+### Installation
+
+```yaml
+steps:
+  - name: deploy
+    image: pelotech/drone-helm3
+    settings:
+      helm_command: upgrade
+      chart: ./
+      release: my-project
+    environment:
+      API_SERVER: https://my.kubernetes.installation/clusters/a-1234
+      KUBERNETES_TOKEN:
+        from_secret: kubernetes_token
+```
+
+### Uninstallation
+
+```yaml
+steps:
+  - name: uninstall
+    image: pelotech/drone-helm3
+    settings:
+      helm_command: uninstall
+      release: my-project
+    environment:
+      API_SERVER: https://my.kubernetes.installation/clusters/a-1234
+      KUBERNETES_TOKEN:
+        from_secret: kubernetes_token
+```
+
+## Upgrading from drone-helm
+
+drone-helm3 is largely backwards-compatible with drone-helm. There are some known differences:
+
+* `prefix` must be supplied via the `settings` block, not `environment`.
+* Several settings no longer have any effect:
+    * `purge` -- this is the default behavior in Helm 3
+    * `recreate_pods`
+    * `tiller_ns`
+    * `upgrade`
+    * `canary_image`
+    * `client_only`
+    * `stable_repo_url`
+
+Since helm 3 does not require Tiller, we also recommend switching to a service account with less-expansive permissions.

assets/kubeconfig.tpl

@@ -3,7 +3,7 @@ clusters:
 - cluster:
 {{- if eq .SkipTLSVerify true }}
     insecure-skip-tls-verify: true
-{{- else }}
+{{- else if .Certificate }}
     certificate-authority-data: {{ .Certificate }}
 {{- end}}
     server: {{ .APIServer }}

cmd/drone-helm/main.go

@@ -2,22 +2,21 @@ package main
 
 import (
 	"fmt"
-	"github.com/kelseyhightower/envconfig"
 	"os"
 
 	"github.com/pelotech/drone-helm3/internal/helm"
 )
 
 func main() {
-	var c helm.Config
+	cfg, err := helm.NewConfig(os.Stdout, os.Stderr)
 
-	if err := envconfig.Process("plugin", &c); err != nil {
+	if err != nil {
 		fmt.Fprintf(os.Stderr, "%s\n", err.Error())
 		return
 	}
 
 	// Make the plan
-	plan, err := helm.NewPlan(c)
+	plan, err := helm.NewPlan(*cfg)
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "%w\n", err)
 		os.Exit(1)
@@ -28,7 +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

@@ -0,0 +1,131 @@
+# Parameter reference
+
+## Global
+| 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.|
+| 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. |
+| 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
+
+Linting is only triggered when the `helm_command` setting is "lint".
+
+| Param name    | Type           | Required | Purpose |
+|---------------|----------------|----------|---------|
+| chart         | string         | yes      | The chart to be linted. Must be a local path. |
+| values        | list\<string\> |          | Chart values to use as the `--set` argument to `helm lint`. |
+| string_values | list\<string\> |          | Chart values to use as the `--set-string` argument to `helm lint`. |
+| values_files  | list\<string\> |          | Values to use as `--values` arguments to `helm lint`. |
+
+## Installation
+
+Installations are triggered when the `helm_command` setting is "upgrade." They can also be triggered when the build was triggered by a `push`, `tag`, `deployment`, `pull_request`, `promote`, or `rollback` Drone event.
+
+| Param name             | Type           | Required | Purpose |
+|------------------------|----------------|----------|---------|
+| chart                  | string         | yes      | The chart to use for this installation. |
+| release                | string         | yes      | The release name for helm to use. |
+| api_server             | string         | yes      | API endpoint for the Kubernetes cluster. |
+| kubernetes_token       | string         | yes      | Token for authenticating to Kubernetes. |
+| service_account        | string         |          | Service account for authenticating to Kubernetes. Default is `helm`. |
+| kubernetes_certificate | string         |          | Base64 encoded TLS certificate used by the Kubernetes cluster's certificate authority. |
+| chart_version          | string         |          | Specific chart version to install. |
+| dry_run                | boolean        |          | Pass `--dry-run` to `helm upgrade`. |
+| wait                   | boolean        |          | Wait until kubernetes resources are in a ready state before marking the installation successful. |
+| timeout                | duration       |          | Timeout for any *individual* Kubernetes operation. The installation's full runtime may exceed this duration. |
+| force                  | boolean        |          | Pass `--force` to `helm upgrade`. |
+| values                 | list\<string\> |          | Chart values to use as the `--set` argument to `helm upgrade`. |
+| string_values          | list\<string\> |          | Chart values to use as the `--set-string` argument to `helm upgrade`. |
+| values_files           | list\<string\> |          | Values to use as `--values` arguments to `helm upgrade`. |
+| reuse_values           | boolean        |          | Reuse the values from a previous release. |
+| skip_tls_verify        | boolean        |          | Connect to the Kubernetes cluster without checking for a valid TLS certificate. Not recommended in production. |
+
+## Uninstallation
+
+Uninstallations are triggered when the `helm_command` setting is "uninstall" or "delete." They can also be triggered when the build was triggered by a `delete` Drone event.
+
+| Param name             | Type     | Required | Purpose |
+|------------------------|----------|----------|---------|
+| release                | string   | yes      | The release name for helm to use. |
+| api_server             | string   | yes      | API endpoint for the Kubernetes cluster. |
+| kubernetes_token       | string   | yes      | Token for authenticating to Kubernetes. |
+| service_account        | string   |          | Service account for authenticating to Kubernetes. Default is `helm`. |
+| kubernetes_certificate | string   |          | Base64 encoded TLS certificate used by the Kubernetes cluster's certificate authority. |
+| 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
+
+Any setting (with the exception of `prefix`; [see below](#user-content-using-the-prefix-setting)), can go in either the `settings` or `environment` section.
+
+### Formatting non-string values
+
+* 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:
+
+```yaml
+values: "foo=1,bar=2"
+values: ["foo=1", "bar=2"]
+values:
+  - foo=1
+  - bar=2
+```
+
+Note that **list members must not contain commas**. Both of the following are equivalent:
+
+```yaml
+values_files: [ "./over_9,000.yml" ]
+values_files: [ "./over_9", "000.yml" ]
+```
+
+### Using the `prefix` setting
+
+Because the prefix setting is meta-configuration, it has some inherent edge-cases. Here is what it does in the cases we've thought of:
+
+Unlike the other settings, it must be declared in the `settings` block, not `environment`:
+
+```yaml
+settings:
+  prefix: helm # drone-helm3 will look for environment variables called HELM_VARNAME
+environment:
+  prefix: armet # no effect
+```
+
+It does not apply to configuration in the `settings` block, only in `environment`:
+
+```yaml
+settings:
+  prefix: helm
+  helm_timeout: 5m # no effect
+environment:
+  helm_timeout: 2m # timeout will be 2 minutes
+```
+
+If the environment contains a variable in non-prefixed form, it will still be applied:
+
+```yaml
+settings:
+  prefix: helm
+environment:
+  timeout: 2m # timeout will be 2 minutes
+```
+
+If the environment contains both the prefixed and non-prefixed forms, drone-helm3 will use the prefixed form:
+
+```yaml
+settings:
+  prefix: helm
+environment:
+  timeout: 5m # overridden
+  helm_timeout: 2m # timeout will be 2 minutes
+```

go.mod

@@ -8,4 +8,5 @@ require (
 	github.com/stretchr/testify v1.4.0
 	golang.org/x/lint v0.0.0-20191125180803-fdd1cda4f05f // indirect
 	golang.org/x/tools v0.0.0-20191209225234-22774f7dae43 // indirect
+	gopkg.in/yaml.v2 v2.2.2
 )

internal/helm/config.go

@@ -2,62 +2,83 @@ package helm
 
 import (
 	"fmt"
-	"strings"
+	"github.com/kelseyhightower/envconfig"
+	"io"
+	"regexp"
 )
 
-// The Config struct captures the `settings` and `environment` blocks inthe application's drone
+var justNumbers = regexp.MustCompile(`^\d+$`)
+
+// The Config struct captures the `settings` and `environment` blocks in the application's drone
 // config. Configuration in drone's `settings` block arrives as uppercase env vars matching the
-// config key, prefixed with `PLUGIN_`. Config from the `environment` block is *not* prefixed; any
-// keys that are likely to be in that block (i.e. things that use `from_secret` need an explicit
-// `envconfig:` tag so that envconfig will look for a non-prefixed env var.
+// config key, prefixed with `PLUGIN_`. Config from the `environment` block is uppercased, but does
+// not have the `PLUGIN_` prefix. It may, however, be prefixed with the value in `$PLUGIN_PREFIX`.
 type Config struct {
 	// Configuration for drone-helm itself
-	Command            helmCommand `envconfig:"HELM_COMMAND"`      // Helm command to run
+	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
+	UpdateDependencies bool     `split_words:"true"`                 // Call `helm dependency update` 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
+	StringValues       string   `split_words:"true"`                 // Argument to pass to --set-string in applicable helm commands
+	ValuesFiles        []string `split_words:"true"`                 // Arguments to pass to --values in applicable helm commands
+	Namespace          string   ``                                   // Kubernetes namespace for all helm commands
+	KubeToken          string   `envconfig:"KUBERNETES_TOKEN"`       // Kubernetes authentication token to put in .kube/config
+	SkipTLSVerify      bool     `envconfig:"SKIP_TLS_VERIFY"`        // Put insecure-skip-tls-verify in .kube/config
+	Certificate        string   `envconfig:"KUBERNETES_CERTIFICATE"` // The Kubernetes cluster CA's self-signed certificate (must be base64-encoded)
+	APIServer          string   `envconfig:"API_SERVER"`             // The Kubernetes cluster's API endpoint
+	ServiceAccount     string   `split_words:"true"`                 // Account to use for connecting to the Kubernetes cluster
+	ChartVersion       string   `split_words:"true"`                 // Specific chart version to use in `helm upgrade`
+	DryRun             bool     `split_words:"true"`                 // Pass --dry-run to applicable helm commands
+	Wait               bool     ``                                   // Pass --wait to applicable helm commands
+	ReuseValues        bool     `split_words:"true"`                 // Pass --reuse-values to `helm upgrade`
+	Timeout            string   ``                                   // Argument to pass to --timeout in applicable helm commands
+	Chart              string   ``                                   // Chart argument to use in applicable helm commands
+	Release            string   ``                                   // Release argument to use in applicable helm commands
+	Force              bool     ``                                   // Pass --force to applicable helm commands
 
-	// Global helm config
-	Debug          bool     ``                                                // global helm flag (also applies to drone-helm itself)
-	KubeConfig     string   `split_words:"true" default:"/root/.kube/config"` // path to the kube config file
-	Values         string   ``
-	StringValues   string   `split_words:"true"`
-	ValuesFiles    []string `split_words:"true"`
-	Namespace      string   ``
-	KubeToken      string   `envconfig:"KUBERNETES_TOKEN"`
-	SkipTLSVerify  bool     `envconfig:"SKIP_TLS_VERIFY"`
-	Certificate    string   `envconfig:"KUBERNETES_CERTIFICATE"`
-	APIServer      string   `envconfig:"API_SERVER"`
-	ServiceAccount string   `envconfig:"SERVICE_ACCOUNT"` // Can't just use split_words; need envconfig to find the non-prefixed form
-
-	// Config specifically for `helm upgrade`
-	ChartVersion string `split_words:"true"` //
-	DryRun       bool   `split_words:"true"` // also available for `delete`
-	Wait         bool   ``                   //
-	ReuseValues  bool   `split_words:"true"` //
-	Timeout      string ``                   //
-	Chart        string ``                   // Also available for `lint`, in which case it must be a path to a chart directory
-	Release      string ``
-	Force        bool   `` //
+	Stdout io.Writer `ignored:"true"`
+	Stderr io.Writer `ignored:"true"`
 }
 
-type helmCommand string
+// NewConfig creates a Config and reads environment variables into it, accounting for several possible formats.
+func NewConfig(stdout, stderr io.Writer) (*Config, error) {
+	cfg := Config{
+		Stdout: stdout,
+		Stderr: stderr,
+	}
+	if err := envconfig.Process("plugin", &cfg); err != nil {
+		return nil, err
+	}
 
-// helmCommand.Decode checks the given value against the list of known commands and generates a helpful error if the command is unknown.
-func (cmd *helmCommand) Decode(value string) error {
-	known := []string{"upgrade", "delete", "lint", "help"}
-	for _, c := range known {
-		if value == c {
-			*cmd = helmCommand(value)
-			return nil
+	prefix := cfg.Prefix
+
+	if err := envconfig.Process("", &cfg); err != nil {
+		return nil, err
+	}
+
+	if prefix != "" {
+		if err := envconfig.Process(cfg.Prefix, &cfg); err != nil {
+			return nil, err
 		}
 	}
 
-	if value == "" {
-		return nil
+	if justNumbers.MatchString(cfg.Timeout) {
+		cfg.Timeout = fmt.Sprintf("%ss", cfg.Timeout)
 	}
-	known[len(known)-1] = fmt.Sprintf("or %s", known[len(known)-1])
-	return fmt.Errorf("unknown command '%s'. If specified, command must be %s",
-		value, strings.Join(known, ", "))
+
+	if cfg.Debug && cfg.Stderr != nil {
+		cfg.logDebug()
+	}
+
+	return &cfg, nil
+}
+
+func (cfg Config) logDebug() {
+	if cfg.KubeToken != "" {
+		cfg.KubeToken = "(redacted)"
+	}
+	fmt.Fprintf(cfg.Stderr, "Generated config: %+v\n", cfg)
 }

internal/helm/config_test.go

@@ -2,27 +2,186 @@ package helm
 
 import (
 	"github.com/stretchr/testify/suite"
+	"os"
+	"strings"
 	"testing"
 )
 
 type ConfigTestSuite struct {
 	suite.Suite
+	// These tests need to mutate the environment, so the suite.setenv and .unsetenv functions store the original contents of the
+	// relevant variable in this map. Its use of *string is so they can distinguish between "not set" and "set to empty string"
+	envBackup map[string]*string
 }
 
 func TestConfigTestSuite(t *testing.T) {
 	suite.Run(t, new(ConfigTestSuite))
 }
 
-func (suite *ConfigTestSuite) TestHelmCommandDecodeSuccess() {
-	cmd := helmCommand("")
-	err := cmd.Decode("upgrade")
-	suite.Require().Nil(err)
+func (suite *ConfigTestSuite) TestNewConfigWithPluginPrefix() {
+	suite.unsetenv("PLUGIN_PREFIX")
+	suite.unsetenv("HELM_COMMAND")
+	suite.unsetenv("UPDATE_DEPENDENCIES")
+	suite.unsetenv("DEBUG")
 
-	suite.EqualValues(cmd, "upgrade")
+	suite.setenv("PLUGIN_HELM_COMMAND", "execute order 66")
+	suite.setenv("PLUGIN_UPDATE_DEPENDENCIES", "true")
+	suite.setenv("PLUGIN_DEBUG", "true")
+
+	cfg, err := NewConfig(&strings.Builder{}, &strings.Builder{})
+	suite.Require().NoError(err)
+
+	suite.Equal("execute order 66", cfg.Command)
+	suite.True(cfg.UpdateDependencies)
+	suite.True(cfg.Debug)
 }
 
-func (suite *ConfigTestSuite) TestHelmCommandDecodeFailure() {
-	cmd := helmCommand("")
-	err := cmd.Decode("execute order 66")
-	suite.EqualError(err, "unknown command 'execute order 66'. If specified, command must be upgrade, delete, lint, or help")
+func (suite *ConfigTestSuite) TestNewConfigWithNoPrefix() {
+	suite.unsetenv("PLUGIN_PREFIX")
+	suite.unsetenv("PLUGIN_HELM_COMMAND")
+	suite.unsetenv("PLUGIN_UPDATE_DEPENDENCIES")
+	suite.unsetenv("PLUGIN_DEBUG")
+
+	suite.setenv("HELM_COMMAND", "execute order 66")
+	suite.setenv("UPDATE_DEPENDENCIES", "true")
+	suite.setenv("DEBUG", "true")
+
+	cfg, err := NewConfig(&strings.Builder{}, &strings.Builder{})
+	suite.Require().NoError(err)
+
+	suite.Equal("execute order 66", cfg.Command)
+	suite.True(cfg.UpdateDependencies)
+	suite.True(cfg.Debug)
+}
+
+func (suite *ConfigTestSuite) TestNewConfigWithConfigurablePrefix() {
+	suite.unsetenv("API_SERVER")
+	suite.unsetenv("PLUGIN_API_SERVER")
+
+	suite.setenv("PLUGIN_PREFIX", "prix_fixe")
+	suite.setenv("PRIX_FIXE_API_SERVER", "your waiter this evening")
+
+	cfg, err := NewConfig(&strings.Builder{}, &strings.Builder{})
+	suite.Require().NoError(err)
+
+	suite.Equal("prix_fixe", cfg.Prefix)
+	suite.Equal("your waiter this evening", cfg.APIServer)
+}
+
+func (suite *ConfigTestSuite) TestPrefixSettingDoesNotAffectPluginPrefix() {
+	suite.setenv("PLUGIN_PREFIX", "IXFREP")
+	suite.setenv("PLUGIN_HELM_COMMAND", "wake me up")
+	suite.setenv("IXFREP_PLUGIN_HELM_COMMAND", "send me to sleep inside")
+
+	cfg, err := NewConfig(&strings.Builder{}, &strings.Builder{})
+	suite.Require().NoError(err)
+
+	suite.Equal("wake me up", cfg.Command)
+}
+
+func (suite *ConfigTestSuite) TestPrefixSettingMustHavePluginPrefix() {
+	suite.unsetenv("PLUGIN_PREFIX")
+	suite.setenv("PREFIX", "refpix")
+	suite.setenv("HELM_COMMAND", "gimme more")
+	suite.setenv("REFPIX_HELM_COMMAND", "gimme less")
+
+	cfg, err := NewConfig(&strings.Builder{}, &strings.Builder{})
+	suite.Require().NoError(err)
+
+	suite.Equal("gimme more", cfg.Command)
+}
+
+func (suite *ConfigTestSuite) TestNewConfigWithConflictingVariables() {
+	suite.setenv("PLUGIN_HELM_COMMAND", "execute order 66")
+	suite.setenv("HELM_COMMAND", "defend the jedi") // values from the `environment` block override those from `settings`
+
+	suite.setenv("PLUGIN_PREFIX", "prod")
+	suite.setenv("TIMEOUT", "5m0s")
+	suite.setenv("PROD_TIMEOUT", "2m30s") // values from prefixed env vars override those from non-prefixed ones
+
+	cfg, err := NewConfig(&strings.Builder{}, &strings.Builder{})
+	suite.Require().NoError(err)
+
+	suite.Equal("defend the jedi", cfg.Command)
+	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{}
+	cfg, err := NewConfig(stdout, stderr)
+	suite.Require().NoError(err)
+
+	suite.Equal(stdout, cfg.Stdout)
+	suite.Equal(stderr, cfg.Stderr)
+}
+
+func (suite *ConfigTestSuite) TestLogDebug() {
+	suite.setenv("DEBUG", "true")
+	suite.setenv("HELM_COMMAND", "upgrade")
+
+	stderr := strings.Builder{}
+	stdout := strings.Builder{}
+	_, err := NewConfig(&stdout, &stderr)
+	suite.Require().NoError(err)
+
+	suite.Equal("", stdout.String())
+
+	suite.Regexp(`^Generated config: \{Command:upgrade.*\}`, stderr.String())
+}
+
+func (suite *ConfigTestSuite) TestLogDebugCensorsKubeToken() {
+	stderr := &strings.Builder{}
+	kubeToken := "I'm shy! Don't put me in your build logs!"
+	cfg := Config{
+		Debug:     true,
+		KubeToken: kubeToken,
+		Stderr:    stderr,
+	}
+
+	cfg.logDebug()
+
+	suite.Contains(stderr.String(), "KubeToken:(redacted)")
+	suite.Equal(kubeToken, cfg.KubeToken) // The actual config value should be left unchanged
+}
+
+func (suite *ConfigTestSuite) setenv(key, val string) {
+	orig, ok := os.LookupEnv(key)
+	if ok {
+		suite.envBackup[key] = &orig
+	} else {
+		suite.envBackup[key] = nil
+	}
+	os.Setenv(key, val)
+}
+
+func (suite *ConfigTestSuite) unsetenv(key string) {
+	orig, ok := os.LookupEnv(key)
+	if ok {
+		suite.envBackup[key] = &orig
+	} else {
+		suite.envBackup[key] = nil
+	}
+	os.Unsetenv(key)
+}
+
+func (suite *ConfigTestSuite) BeforeTest(_, _ string) {
+	suite.envBackup = make(map[string]*string)
+}
+
+func (suite *ConfigTestSuite) AfterTest(_, _ string) {
+	for key, val := range suite.envBackup {
+		if val == nil {
+			os.Unsetenv(key)
+		} else {
+			os.Setenv(key, *val)
+		}
+	}
 }

internal/helm/plan.go

@@ -6,7 +6,10 @@ import (
 	"os"
 )
 
-const kubeConfigTemplate = "/root/.kube/config.tpl"
+const (
+	kubeConfigTemplate = "/root/.kube/config.tpl"
+	kubeConfigFile     = "/root/.kube/config"
+)
 
 // A Step is one step in the plan.
 type Step interface {
@@ -27,13 +30,12 @@ func NewPlan(cfg Config) (*Plan, error) {
 		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,
+			Stdout:       cfg.Stdout,
+			Stderr:       cfg.Stderr,
 		},
 	}
 
@@ -59,18 +61,20 @@ func determineSteps(cfg Config) *func(Config) []Step {
 	switch cfg.Command {
 	case "upgrade":
 		return &upgrade
-	case "delete":
-		panic("not implemented")
+	case "uninstall", "delete":
+		return &uninstall
 	case "lint":
-		panic("not implemented")
+		return &lint
 	case "help":
 		return &help
 	default:
 		switch cfg.DroneEvent {
 		case "push", "tag", "deployment", "pull_request", "promote", "rollback":
 			return &upgrade
+		case "delete":
+			return &uninstall
 		default:
-			panic("not implemented")
+			return &help
 		}
 	}
 }
@@ -79,11 +83,11 @@ func determineSteps(cfg Config) *func(Config) []Step {
 func (p *Plan) Execute() error {
 	for i, step := range p.steps {
 		if p.cfg.Debug {
-			fmt.Fprintf(os.Stderr, "calling %T.Execute (step %d)\n", step, i)
+			fmt.Fprintf(p.cfg.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 fmt.Errorf("while executing %T step: %w", step, err)
 		}
 	}
 
@@ -91,21 +95,16 @@ func (p *Plan) Execute() error {
 }
 
 var upgrade = func(cfg Config) []Step {
-	steps := make([]Step, 0)
-
-	steps = append(steps, &run.InitKube{
-		SkipTLSVerify:  cfg.SkipTLSVerify,
-		Certificate:    cfg.Certificate,
-		APIServer:      cfg.APIServer,
-		ServiceAccount: cfg.ServiceAccount,
-		Token:          cfg.KubeToken,
-		TemplateFile:   kubeConfigTemplate,
-	})
-
+	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,
 		ChartVersion: cfg.ChartVersion,
+		DryRun:       cfg.DryRun,
 		Wait:         cfg.Wait,
 		ReuseValues:  cfg.ReuseValues,
 		Timeout:      cfg.Timeout,
@@ -115,7 +114,67 @@ var upgrade = func(cfg Config) []Step {
 	return steps
 }
 
+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,
+	})
+
+	return steps
+}
+
+var lint = func(cfg Config) []Step {
+	steps := addRepos(cfg)
+	if cfg.UpdateDependencies {
+		steps = append(steps, depUpdate(cfg)...)
+	}
+	steps = append(steps, &run.Lint{
+		Chart: cfg.Chart,
+	})
+
+	return steps
+}
+
 var help = func(cfg Config) []Step {
-	help := &run.Help{}
+	help := &run.Help{
+		HelmCommand: cfg.Command,
+	}
 	return []Step{help}
 }
+
+func initKube(cfg Config) []Step {
+	return []Step{
+		&run.InitKube{
+			SkipTLSVerify:  cfg.SkipTLSVerify,
+			Certificate:    cfg.Certificate,
+			APIServer:      cfg.APIServer,
+			ServiceAccount: cfg.ServiceAccount,
+			Token:          cfg.KubeToken,
+			TemplateFile:   kubeConfigTemplate,
+			ConfigFile:     kubeConfigFile,
+		},
+	}
+}
+
+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

@@ -4,7 +4,7 @@ import (
 	"fmt"
 	"github.com/golang/mock/gomock"
 	"github.com/stretchr/testify/suite"
-	"os"
+	"strings"
 	"testing"
 
 	"github.com/pelotech/drone-helm3/internal/run"
@@ -20,6 +20,7 @@ func TestPlanTestSuite(t *testing.T) {
 
 func (suite *PlanTestSuite) TestNewPlan() {
 	ctrl := gomock.NewController(suite.T())
+	defer ctrl.Finish()
 	stepOne := NewMockStep(ctrl)
 	stepTwo := NewMockStep(ctrl)
 
@@ -29,25 +30,27 @@ func (suite *PlanTestSuite) TestNewPlan() {
 	}
 	defer func() { help = origHelp }()
 
+	stdout := strings.Builder{}
+	stderr := strings.Builder{}
 	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",
+		Stdout:       &stdout,
+		Stderr:       &stderr,
 	}
 
 	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,
+		Stdout:       &stdout,
+		Stderr:       &stderr,
 	}
 
 	stepOne.EXPECT().
@@ -63,6 +66,7 @@ func (suite *PlanTestSuite) TestNewPlan() {
 
 func (suite *PlanTestSuite) TestNewPlanAbortsOnError() {
 	ctrl := gomock.NewController(suite.T())
+	defer ctrl.Finish()
 	stepOne := NewMockStep(ctrl)
 	stepTwo := NewMockStep(ctrl)
 
@@ -85,14 +89,55 @@ func (suite *PlanTestSuite) TestNewPlanAbortsOnError() {
 	suite.EqualError(err, "while preparing *helm.MockStep step: I'm starry Dave, aye, cat blew that")
 }
 
+func (suite *PlanTestSuite) TestExecute() {
+	ctrl := gomock.NewController(suite.T())
+	defer ctrl.Finish()
+	stepOne := NewMockStep(ctrl)
+	stepTwo := NewMockStep(ctrl)
+
+	runCfg := run.Config{}
+
+	plan := Plan{
+		steps:  []Step{stepOne, stepTwo},
+		runCfg: runCfg,
+	}
+
+	stepOne.EXPECT().
+		Execute(runCfg).
+		Times(1)
+	stepTwo.EXPECT().
+		Execute(runCfg).
+		Times(1)
+
+	suite.NoError(plan.Execute())
+}
+
+func (suite *PlanTestSuite) TestExecuteAbortsOnError() {
+	ctrl := gomock.NewController(suite.T())
+	defer ctrl.Finish()
+	stepOne := NewMockStep(ctrl)
+	stepTwo := NewMockStep(ctrl)
+
+	runCfg := run.Config{}
+
+	plan := Plan{
+		steps:  []Step{stepOne, stepTwo},
+		runCfg: runCfg,
+	}
+
+	stepOne.EXPECT().
+		Execute(runCfg).
+		Times(1).
+		Return(fmt.Errorf("oh, he'll gnaw"))
+
+	err := plan.Execute()
+	suite.EqualError(err, "while executing *helm.MockStep step: oh, he'll gnaw")
+}
+
 func (suite *PlanTestSuite) TestUpgrade() {
 	cfg := Config{
-		KubeToken:      "cXVlZXIgY2hhcmFjdGVyCg==",
-		SkipTLSVerify:  true,
-		Certificate:    "b2Ygd29rZW5lc3MK",
-		APIServer:      "123.456.78.9",
-		ServiceAccount: "helmet",
 		ChartVersion: "seventeen",
+		DryRun:       true,
 		Wait:         true,
 		ReuseValues:  true,
 		Timeout:      "go sit in the corner",
@@ -102,30 +147,17 @@ func (suite *PlanTestSuite) TestUpgrade() {
 	}
 
 	steps := upgrade(cfg)
-
-	suite.Equal(2, len(steps))
-
+	suite.Require().Equal(2, len(steps), "upgrade should return 2 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{
+	expected := &run.Upgrade{
 		Chart:        cfg.Chart,
 		Release:      cfg.Release,
 		ChartVersion: cfg.ChartVersion,
+		DryRun:       true,
 		Wait:         cfg.Wait,
 		ReuseValues:  cfg.ReuseValues,
 		Timeout:      cfg.Timeout,
@@ -135,6 +167,168 @@ func (suite *PlanTestSuite) TestUpgrade() {
 	suite.Equal(expected, upgrade)
 }
 
+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,
+		Certificate:    "cHJvY2xhaW1zIHdvbmRlcmZ1bCBmcmllbmRzaGlw",
+		APIServer:      "98.765.43.21",
+		ServiceAccount: "greathelm",
+		DryRun:         true,
+		Timeout:        "think about what you did",
+		Release:        "jetta_id_love_to_change_the_world",
+	}
+
+	steps := uninstall(cfg)
+	suite.Require().Equal(2, len(steps), "uninstall should return 2 steps")
+
+	suite.Require().IsType(&run.InitKube{}, steps[0])
+	init, _ := steps[0].(*run.InitKube)
+	var expected Step = &run.InitKube{
+		SkipTLSVerify:  true,
+		Certificate:    "cHJvY2xhaW1zIHdvbmRlcmZ1bCBmcmllbmRzaGlw",
+		APIServer:      "98.765.43.21",
+		ServiceAccount: "greathelm",
+		Token:          "b2YgbXkgYWZmZWN0aW9u",
+		TemplateFile:   kubeConfigTemplate,
+		ConfigFile:     kubeConfigFile,
+	}
+
+	suite.Equal(expected, init)
+
+	suite.Require().IsType(&run.Uninstall{}, steps[1])
+	actual, _ := steps[1].(*run.Uninstall)
+	expected = &run.Uninstall{
+		Release: "jetta_id_love_to_change_the_world",
+		DryRun:  true,
+	}
+	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==",
+		SkipTLSVerify:  true,
+		Certificate:    "b2Ygd29rZW5lc3MK",
+		APIServer:      "123.456.78.9",
+		ServiceAccount: "helmet",
+	}
+
+	steps := initKube(cfg)
+	suite.Require().Equal(1, len(steps), "initKube should return one step")
+	suite.Require().IsType(&run.InitKube{}, steps[0])
+	init, _ := steps[0].(*run.InitKube)
+
+	expected := &run.InitKube{
+		SkipTLSVerify:  true,
+		Certificate:    "b2Ygd29rZW5lc3MK",
+		APIServer:      "123.456.78.9",
+		ServiceAccount: "helmet",
+		Token:          "cXVlZXIgY2hhcmFjdGVyCg==",
+		TemplateFile:   kubeConfigTemplate,
+		ConfigFile:     kubeConfigFile,
+	}
+	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",
+	}
+
+	steps := lint(cfg)
+	suite.Equal(1, len(steps))
+
+	want := &run.Lint{
+		Chart: "./flow",
+	}
+	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",
@@ -154,6 +348,40 @@ func (suite *PlanTestSuite) TestDeterminePlanUpgradeFromDroneEvent() {
 	}
 }
 
+func (suite *PlanTestSuite) TestDeterminePlanUninstallCommand() {
+	cfg := Config{
+		Command: "uninstall",
+	}
+	stepsMaker := determineSteps(cfg)
+	suite.Same(&uninstall, stepsMaker)
+}
+
+// helm_command = delete is provided as an alias for backwards-compatibility with drone-helm
+func (suite *PlanTestSuite) TestDeterminePlanDeleteCommand() {
+	cfg := Config{
+		Command: "delete",
+	}
+	stepsMaker := determineSteps(cfg)
+	suite.Same(&uninstall, stepsMaker)
+}
+
+func (suite *PlanTestSuite) TestDeterminePlanDeleteFromDroneEvent() {
+	cfg := Config{
+		DroneEvent: "delete",
+	}
+	stepsMaker := determineSteps(cfg)
+	suite.Same(&uninstall, stepsMaker)
+}
+
+func (suite *PlanTestSuite) TestDeterminePlanLintCommand() {
+	cfg := Config{
+		Command: "lint",
+	}
+
+	stepsMaker := determineSteps(cfg)
+	suite.Same(&lint, stepsMaker)
+}
+
 func (suite *PlanTestSuite) TestDeterminePlanHelpCommand() {
 	cfg := Config{
 		Command: "help",

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/config.go

@@ -7,7 +7,6 @@ import (
 // Config contains configuration applicable to all helm commands
 type Config struct {
 	Debug        bool
-	KubeConfig   string
 	Values       string
 	StringValues string
 	ValuesFiles  []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 {
-	return h.cmd.Run()
+func (h *Help) Execute(cfg Config) error {
+	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)
-	h.Execute(cfg)
+	suite.NoError(err)
+}
+
+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/initkube.go

@@ -16,6 +16,7 @@ type InitKube struct {
 	ServiceAccount string
 	Token          string
 	TemplateFile   string
+	ConfigFile     string
 
 	template   *template.Template
 	configFile io.WriteCloser
@@ -34,7 +35,7 @@ type kubeValues struct {
 // 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)
+		fmt.Fprintf(cfg.Stderr, "writing kubeconfig file to %s\n", i.ConfigFile)
 	}
 	defer i.configFile.Close()
 	return i.template.Execute(i.configFile, i.values)
@@ -50,9 +51,6 @@ func (i *InitKube) Prepare(cfg Config) error {
 	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"
@@ -76,16 +74,16 @@ func (i *InitKube) Prepare(cfg Config) error {
 	}
 
 	if cfg.Debug {
-		if _, err := os.Stat(cfg.KubeConfig); err != nil {
+		if _, err := os.Stat(i.ConfigFile); 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)
+		fmt.Fprintf(cfg.Stderr, "kubeconfig file at %s\n", i.ConfigFile)
 	}
 
-	i.configFile, err = os.Create(cfg.KubeConfig)
+	i.configFile, err = os.Create(i.ConfigFile)
 	if err != nil {
 		return fmt.Errorf("could not open kubeconfig file for writing: %w", err)
 	}

internal/run/initkube_test.go

@@ -1,12 +1,12 @@
 package run
 
 import (
+	"github.com/stretchr/testify/suite"
+	yaml "gopkg.in/yaml.v2"
 	"io/ioutil"
 	"os"
-	"text/template"
-	// "github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/suite"
 	"testing"
+	"text/template"
 )
 
 type InitKubeTestSuite struct {
@@ -34,10 +34,10 @@ namespace: {{ .Namespace }}
 		Certificate:  "CCNA",
 		Token:        "Aspire virtual currency",
 		TemplateFile: templateFile.Name(),
+		ConfigFile:   configFile.Name(),
 	}
 	cfg := Config{
 		Namespace: "Cisco",
-		KubeConfig: configFile.Name(),
 	}
 	err = init.Prepare(cfg)
 	suite.Require().Nil(err)
@@ -58,6 +58,59 @@ namespace: Cisco
 	suite.Equal(want, string(conf))
 }
 
+func (suite *InitKubeTestSuite) TestExecuteGeneratesConfig() {
+	configFile, err := tempfile("kubeconfig********.yml", "")
+	defer os.Remove(configFile.Name())
+	suite.Require().NoError(err)
+
+	cfg := Config{
+		Namespace: "marshmallow",
+	}
+	init := InitKube{
+		ConfigFile:     configFile.Name(),
+		TemplateFile:   "../../assets/kubeconfig.tpl", // the actual kubeconfig template
+		APIServer:      "https://kube.cluster/peanut",
+		ServiceAccount: "chef",
+		Token:          "eWVhaCB3ZSB0b2tpbic=",
+		Certificate:    "d293LCB5b3UgYXJlIHNvIGNvb2wgZm9yIHNtb2tpbmcgd2VlZCDwn5mE",
+	}
+	suite.Require().NoError(init.Prepare(cfg))
+	suite.Require().NoError(init.Execute(cfg))
+
+	contents, err := ioutil.ReadFile(configFile.Name())
+	suite.Require().NoError(err)
+
+	// each setting should be reflected in the generated file
+	expectations := []string{
+		"namespace: marshmallow",
+		"server: https://kube.cluster/peanut",
+		"user: chef",
+		"name: chef",
+		"token: eWVhaCB3ZSB0b2tpbic",
+		"certificate-authority-data: d293LCB5b3UgYXJlIHNvIGNvb2wgZm9yIHNtb2tpbmcgd2VlZCDwn5mE",
+	}
+	for _, expected := range expectations {
+		suite.Contains(string(contents), expected)
+	}
+
+	// the generated config should be valid yaml, with no repeated keys
+	conf := map[string]interface{}{}
+	suite.NoError(yaml.UnmarshalStrict(contents, &conf))
+
+	// test the other branch of the certificate/SkipTLSVerify conditional
+	init.SkipTLSVerify = true
+	init.Certificate = ""
+
+	suite.Require().NoError(init.Prepare(cfg))
+	suite.Require().NoError(init.Execute(cfg))
+	contents, err = ioutil.ReadFile(configFile.Name())
+	suite.Require().NoError(err)
+	suite.Contains(string(contents), "insecure-skip-tls-verify: true")
+
+	conf = map[string]interface{}{}
+	suite.NoError(yaml.UnmarshalStrict(contents, &conf))
+}
+
 func (suite *InitKubeTestSuite) TestPrepareParseError() {
 	templateFile, err := tempfile("kubeconfig********.yml.tpl", `{{ NonexistentFunction }}`)
 	defer os.Remove(templateFile.Name())
@@ -95,11 +148,10 @@ func (suite *InitKubeTestSuite) TestPrepareCannotOpenDestinationFile() {
 		Certificate:  "CCNA",
 		Token:        "Aspire virtual currency",
 		TemplateFile: templateFile.Name(),
+		ConfigFile:   "/usr/foreign/exclude/kubeprofig",
 	}
 
-	cfg := Config{
-		KubeConfig: "/usr/foreign/exclude/kubeprofig",
-	}
+	cfg := Config{}
 	err = init.Prepare(cfg)
 	suite.Error(err)
 	suite.Regexp("could not open .* for writing: .* no such file or directory", err)
@@ -120,11 +172,10 @@ func (suite *InitKubeTestSuite) TestPrepareRequiredConfig() {
 		Certificate:  "CCNA",
 		Token:        "Aspire virtual currency",
 		TemplateFile: templateFile.Name(),
+		ConfigFile:   configFile.Name(),
 	}
 
-	cfg := Config{
-		KubeConfig: configFile.Name(),
-	}
+	cfg := Config{}
 
 	suite.NoError(init.Prepare(cfg)) // consistency check; we should be starting in a happy state
 
@@ -134,13 +185,6 @@ func (suite *InitKubeTestSuite) TestPrepareRequiredConfig() {
 	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() {
@@ -157,11 +201,10 @@ func (suite *InitKubeTestSuite) TestPrepareDefaultsServiceAccount() {
 		Certificate:  "CCNA",
 		Token:        "Aspire virtual currency",
 		TemplateFile: templateFile.Name(),
+		ConfigFile:   configFile.Name(),
 	}
 
-	cfg := Config{
-		KubeConfig: configFile.Name(),
-	}
+	cfg := Config{}
 
 	init.Prepare(cfg)
 	suite.Equal("helm", init.ServiceAccount)

internal/run/lint.go

@@ -0,0 +1,56 @@
+package run
+
+import (
+	"fmt"
+)
+
+// Lint is an execution step that calls `helm lint` when executed.
+type Lint struct {
+	Chart string
+	cmd   cmd
+}
+
+// Execute executes the `helm lint` command.
+func (l *Lint) Execute(_ Config) error {
+	return l.cmd.Run()
+}
+
+// Prepare gets the Lint ready to execute.
+func (l *Lint) Prepare(cfg Config) error {
+	if l.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, "lint")
+
+	if cfg.Values != "" {
+		args = append(args, "--set", cfg.Values)
+	}
+	if cfg.StringValues != "" {
+		args = append(args, "--set-string", cfg.StringValues)
+	}
+	for _, vFile := range cfg.ValuesFiles {
+		args = append(args, "--values", vFile)
+	}
+
+	args = append(args, l.Chart)
+
+	l.cmd = command(helmBin, args...)
+	l.cmd.Stdout(cfg.Stdout)
+	l.cmd.Stderr(cfg.Stderr)
+
+	if cfg.Debug {
+		fmt.Fprintf(cfg.Stderr, "Generated command: '%s'\n", l.cmd.String())
+	}
+
+	return nil
+}

internal/run/lint_test.go

@@ -0,0 +1,169 @@
+package run
+
+import (
+	"fmt"
+	"github.com/golang/mock/gomock"
+	"github.com/stretchr/testify/suite"
+	"strings"
+	"testing"
+)
+
+type LintTestSuite struct {
+	suite.Suite
+	ctrl            *gomock.Controller
+	mockCmd         *Mockcmd
+	originalCommand func(string, ...string) cmd
+}
+
+func (suite *LintTestSuite) 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 *LintTestSuite) AfterTest(_, _ string) {
+	command = suite.originalCommand
+}
+
+func TestLintTestSuite(t *testing.T) {
+	suite.Run(t, new(LintTestSuite))
+}
+
+func (suite *LintTestSuite) TestPrepareAndExecute() {
+	defer suite.ctrl.Finish()
+
+	stdout := strings.Builder{}
+	stderr := strings.Builder{}
+
+	l := Lint{
+		Chart: "./epic/mychart",
+	}
+	cfg := Config{
+		Stdout: &stdout,
+		Stderr: &stderr,
+	}
+
+	command = func(path string, args ...string) cmd {
+		suite.Equal(helmBin, path)
+		suite.Equal([]string{"lint", "./epic/mychart"}, args)
+
+		return suite.mockCmd
+	}
+
+	suite.mockCmd.EXPECT().
+		Stdout(&stdout)
+	suite.mockCmd.EXPECT().
+		Stderr(&stderr)
+	suite.mockCmd.EXPECT().
+		Run().
+		Times(1)
+
+	err := l.Prepare(cfg)
+	suite.Require().Nil(err)
+	l.Execute(cfg)
+}
+
+func (suite *LintTestSuite) TestPrepareRequiresChart() {
+	// 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{}
+	l := Lint{}
+
+	err := l.Prepare(cfg)
+	suite.EqualError(err, "chart is required", "Chart should be mandatory")
+}
+
+func (suite *LintTestSuite) TestPrepareWithLintFlags() {
+	defer suite.ctrl.Finish()
+
+	cfg := Config{
+		Values:       "width=5",
+		StringValues: "version=2.0",
+		ValuesFiles:  []string{"/usr/local/underrides", "/usr/local/overrides"},
+	}
+
+	l := Lint{
+		Chart: "./uk/top_40",
+	}
+
+	command = func(path string, args ...string) cmd {
+		suite.Equal(helmBin, path)
+		suite.Equal([]string{"lint",
+			"--set", "width=5",
+			"--set-string", "version=2.0",
+			"--values", "/usr/local/underrides",
+			"--values", "/usr/local/overrides",
+			"./uk/top_40"}, args)
+
+		return suite.mockCmd
+	}
+
+	suite.mockCmd.EXPECT().Stdout(gomock.Any()).AnyTimes()
+	suite.mockCmd.EXPECT().Stderr(gomock.Any()).AnyTimes()
+
+	err := l.Prepare(cfg)
+	suite.Require().Nil(err)
+}
+
+func (suite *LintTestSuite) TestPrepareWithDebugFlag() {
+	defer suite.ctrl.Finish()
+
+	stderr := strings.Builder{}
+
+	cfg := Config{
+		Debug:  true,
+		Stderr: &stderr,
+	}
+
+	l := Lint{
+		Chart: "./scotland/top_40",
+	}
+
+	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())
+	suite.mockCmd.EXPECT().Stderr(&stderr)
+
+	err := l.Prepare(cfg)
+	suite.Require().Nil(err)
+
+	want := fmt.Sprintf("Generated command: '%s --debug lint ./scotland/top_40'\n", helmBin)
+	suite.Equal(want, stderr.String())
+}
+
+func (suite *LintTestSuite) TestPrepareWithNamespaceFlag() {
+	defer suite.ctrl.Finish()
+
+	cfg := Config{
+		Namespace: "table-service",
+	}
+
+	l := Lint{
+		Chart: "./wales/top_40",
+	}
+
+	actual := []string{}
+	command = func(path string, args ...string) cmd {
+		actual = args
+		return suite.mockCmd
+	}
+
+	suite.mockCmd.EXPECT().Stdout(gomock.Any()).AnyTimes()
+	suite.mockCmd.EXPECT().Stderr(gomock.Any()).AnyTimes()
+
+	err := l.Prepare(cfg)
+	suite.Require().Nil(err)
+
+	expected := []string{"--namespace", "table-service", "lint", "./wales/top_40"}
+	suite.Equal(expected, actual)
+}

internal/run/uninstall.go

@@ -0,0 +1,51 @@
+package run
+
+import (
+	"fmt"
+)
+
+// Uninstall is an execution step that calls `helm uninstall` when executed.
+type Uninstall struct {
+	Release string
+	DryRun  bool
+	cmd     cmd
+}
+
+// Execute executes the `helm uninstall` command.
+func (u *Uninstall) Execute(_ Config) error {
+	return u.cmd.Run()
+}
+
+// Prepare gets the Uninstall ready to execute.
+func (u *Uninstall) Prepare(cfg Config) error {
+	if u.Release == "" {
+		return fmt.Errorf("release 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, "uninstall")
+
+	if u.DryRun {
+		args = append(args, "--dry-run")
+	}
+
+	args = append(args, u.Release)
+
+	u.cmd = command(helmBin, args...)
+	u.cmd.Stdout(cfg.Stdout)
+	u.cmd.Stderr(cfg.Stderr)
+
+	if cfg.Debug {
+		fmt.Fprintf(cfg.Stderr, "Generated command: '%s'\n", u.cmd.String())
+	}
+
+	return nil
+}

internal/run/uninstall_test.go

@@ -0,0 +1,134 @@
+package run
+
+import (
+	"fmt"
+	"github.com/golang/mock/gomock"
+	"github.com/stretchr/testify/suite"
+	"strings"
+	"testing"
+)
+
+type UninstallTestSuite struct {
+	suite.Suite
+	ctrl            *gomock.Controller
+	mockCmd         *Mockcmd
+	actualArgs      []string
+	originalCommand func(string, ...string) cmd
+}
+
+func (suite *UninstallTestSuite) BeforeTest(_, _ string) {
+	suite.ctrl = gomock.NewController(suite.T())
+	suite.mockCmd = NewMockcmd(suite.ctrl)
+
+	suite.originalCommand = command
+	command = func(path string, args ...string) cmd {
+		suite.actualArgs = args
+		return suite.mockCmd
+	}
+}
+
+func (suite *UninstallTestSuite) AfterTest(_, _ string) {
+	command = suite.originalCommand
+}
+
+func TestUninstallTestSuite(t *testing.T) {
+	suite.Run(t, new(UninstallTestSuite))
+}
+
+func (suite *UninstallTestSuite) TestPrepareAndExecute() {
+	defer suite.ctrl.Finish()
+
+	u := Uninstall{
+		Release: "zayde_wølf_king",
+	}
+
+	actual := []string{}
+	command = func(path string, args ...string) cmd {
+		suite.Equal(helmBin, path)
+		actual = args
+
+		return suite.mockCmd
+	}
+
+	suite.mockCmd.EXPECT().
+		Stdout(gomock.Any())
+	suite.mockCmd.EXPECT().
+		Stderr(gomock.Any())
+	suite.mockCmd.EXPECT().
+		Run().
+		Times(1)
+
+	cfg := Config{}
+	suite.NoError(u.Prepare(cfg))
+	expected := []string{"uninstall", "zayde_wølf_king"}
+	suite.Equal(expected, actual)
+
+	u.Execute(cfg)
+}
+
+func (suite *UninstallTestSuite) TestPrepareDryRunFlag() {
+	u := Uninstall{
+		Release: "firefox_ak_wildfire",
+		DryRun:  true,
+	}
+	cfg := Config{}
+
+	suite.mockCmd.EXPECT().Stdout(gomock.Any()).AnyTimes()
+	suite.mockCmd.EXPECT().Stderr(gomock.Any()).AnyTimes()
+
+	suite.NoError(u.Prepare(cfg))
+	expected := []string{"uninstall", "--dry-run", "firefox_ak_wildfire"}
+	suite.Equal(expected, suite.actualArgs)
+}
+
+func (suite *UninstallTestSuite) TestPrepareNamespaceFlag() {
+	u := Uninstall{
+		Release: "carly_simon_run_away_with_me",
+	}
+	cfg := Config{
+		Namespace: "emotion",
+	}
+
+	suite.mockCmd.EXPECT().Stdout(gomock.Any()).AnyTimes()
+	suite.mockCmd.EXPECT().Stderr(gomock.Any()).AnyTimes()
+
+	suite.NoError(u.Prepare(cfg))
+	expected := []string{"--namespace", "emotion", "uninstall", "carly_simon_run_away_with_me"}
+	suite.Equal(expected, suite.actualArgs)
+}
+
+func (suite *UninstallTestSuite) TestPrepareDebugFlag() {
+	u := Uninstall{
+		Release: "just_a_band_huff_and_puff",
+	}
+	stderr := strings.Builder{}
+	cfg := Config{
+		Debug:  true,
+		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(&stderr).AnyTimes()
+
+	suite.NoError(u.Prepare(cfg))
+	suite.Equal(fmt.Sprintf("Generated command: '%s --debug "+
+		"uninstall just_a_band_huff_and_puff'\n", helmBin), stderr.String())
+}
+
+func (suite *UninstallTestSuite) TestPrepareRequiresRelease() {
+	// 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()
+
+	u := Uninstall{}
+	err := u.Prepare(Config{})
+	suite.EqualError(err, "release is required", "Uninstall.Release should be mandatory")
+}

internal/run/upgrade.go

@@ -10,6 +10,7 @@ type Upgrade struct {
 	Release string
 
 	ChartVersion string
+	DryRun       bool
 	Wait         bool
 	ReuseValues  bool
 	Timeout      string
@@ -25,18 +26,53 @@ func (u *Upgrade) Execute(_ Config) error {
 
 // Prepare gets the Upgrade ready to execute.
 func (u *Upgrade) Prepare(cfg Config) error {
-	args := []string{"--kubeconfig", cfg.KubeConfig}
+	if u.Chart == "" {
+		return fmt.Errorf("chart is required")
+	}
+	if u.Release == "" {
+		return fmt.Errorf("release is required")
+	}
+
+	args := make([]string, 0)
 
 	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...)
+		args = append(args, "--debug")
 	}
 
+	args = append(args, "upgrade", "--install")
+
+	if u.ChartVersion != "" {
+		args = append(args, "--version", u.ChartVersion)
+	}
+	if u.DryRun {
+		args = append(args, "--dry-run")
+	}
+	if u.Wait {
+		args = append(args, "--wait")
+	}
+	if u.ReuseValues {
+		args = append(args, "--reuse-values")
+	}
+	if u.Timeout != "" {
+		args = append(args, "--timeout", u.Timeout)
+	}
+	if u.Force {
+		args = append(args, "--force")
+	}
+	if cfg.Values != "" {
+		args = append(args, "--set", cfg.Values)
+	}
+	if cfg.StringValues != "" {
+		args = append(args, "--set-string", cfg.StringValues)
+	}
+	for _, vFile := range cfg.ValuesFiles {
+		args = append(args, "--values", vFile)
+	}
+
+	args = append(args, u.Release, u.Chart)
 	u.cmd = command(helmBin, args...)
 	u.cmd.Stdout(cfg.Stdout)
 	u.cmd.Stderr(cfg.Stderr)

internal/run/upgrade_test.go

@@ -31,7 +31,7 @@ func TestUpgradeTestSuite(t *testing.T) {
 	suite.Run(t, new(UpgradeTestSuite))
 }
 
-func (suite *UpgradeTestSuite) TestPrepare() {
+func (suite *UpgradeTestSuite) TestPrepareAndExecute() {
 	defer suite.ctrl.Finish()
 
 	u := Upgrade{
@@ -41,8 +41,7 @@ func (suite *UpgradeTestSuite) TestPrepare() {
 
 	command = func(path string, args ...string) cmd {
 		suite.Equal(helmBin, path)
-		suite.Equal([]string{"--kubeconfig", "/root/.kube/config", "upgrade", "--install",
-			"jonas_brothers_only_human", "at40"}, args)
+		suite.Equal([]string{"upgrade", "--install", "jonas_brothers_only_human", "at40"}, args)
 
 		return suite.mockCmd
 	}
@@ -55,9 +54,7 @@ func (suite *UpgradeTestSuite) TestPrepare() {
 		Run().
 		Times(1)
 
-	cfg := Config{
-		KubeConfig: "/root/.kube/config",
-	}
+	cfg := Config{}
 	err := u.Prepare(cfg)
 	suite.Require().Nil(err)
 	u.Execute(cfg)
@@ -73,26 +70,84 @@ func (suite *UpgradeTestSuite) TestPrepareNamespaceFlag() {
 
 	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)
+		suite.Equal([]string{"--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()
+	suite.mockCmd.EXPECT().Stdout(gomock.Any())
+	suite.mockCmd.EXPECT().Stderr(gomock.Any())
 
 	cfg := Config{
 		Namespace: "melt",
-		KubeConfig: "/root/.kube/config",
 	}
 	err := u.Prepare(cfg)
 	suite.Require().Nil(err)
-	u.Execute(cfg)
+}
+
+func (suite *UpgradeTestSuite) TestPrepareWithUpgradeFlags() {
+	defer suite.ctrl.Finish()
+
+	u := Upgrade{
+		Chart:        "hot_ac",
+		Release:      "maroon_5_memories",
+		ChartVersion: "radio_edit",        //-version
+		DryRun:       true,                //-run
+		Wait:         true,                //-wait
+		ReuseValues:  true,                //-values
+		Timeout:      "sit_in_the_corner", //-timeout
+		Force:        true,                //-force
+	}
+
+	cfg := Config{
+		Values:       "age=35",
+		StringValues: "height=5ft10in",
+		ValuesFiles:  []string{"/usr/local/stats", "/usr/local/grades"},
+	}
+
+	command = func(path string, args ...string) cmd {
+		suite.Equal(helmBin, path)
+		suite.Equal([]string{"upgrade", "--install",
+			"--version", "radio_edit",
+			"--dry-run",
+			"--wait",
+			"--reuse-values",
+			"--timeout", "sit_in_the_corner",
+			"--force",
+			"--set", "age=35",
+			"--set-string", "height=5ft10in",
+			"--values", "/usr/local/stats",
+			"--values", "/usr/local/grades",
+			"maroon_5_memories", "hot_ac"}, args)
+
+		return suite.mockCmd
+	}
+
+	suite.mockCmd.EXPECT().Stdout(gomock.Any())
+	suite.mockCmd.EXPECT().Stderr(gomock.Any())
+
+	err := u.Prepare(cfg)
+	suite.Require().Nil(err)
+}
+
+func (suite *UpgradeTestSuite) TestRequiresChartAndRelease() {
+	// 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()
+
+	u := Upgrade{
+		Release: "seth_everman_unskippable_cutscene",
+	}
+
+	err := u.Prepare(Config{})
+	suite.EqualError(err, "chart is required", "Chart should be mandatory")
+
+	u = Upgrade{
+		Chart: "billboard_top_zero",
+	}
+
+	err = u.Prepare(Config{})
+	suite.EqualError(err, "release is required", "Release should be mandatory")
 }
 
 func (suite *UpgradeTestSuite) TestPrepareDebugFlag() {
@@ -105,7 +160,6 @@ func (suite *UpgradeTestSuite) TestPrepareDebugFlag() {
 	stderr := strings.Builder{}
 	cfg := Config{
 		Debug:  true,
-		KubeConfig: "/root/.kube/config",
 		Stdout: &stdout,
 		Stderr: &stderr,
 	}
@@ -125,7 +179,7 @@ func (suite *UpgradeTestSuite) TestPrepareDebugFlag() {
 
 	u.Prepare(cfg)
 
-	want := fmt.Sprintf("Generated command: '%s --debug --kubeconfig /root/.kube/config upgrade "+
+	want := fmt.Sprintf("Generated command: '%s --debug upgrade "+
 		"--install lewis_capaldi_someone_you_loved at40'\n", helmBin)
 	suite.Equal(want, stderr.String())
 	suite.Equal("", stdout.String())