- How to help
- Contribution Ladder
- Developer Tasks
- Code structure and practices
How to help
We welcome your contributions and participation! If you aren’t sure what to expect, here are some norms for our project so you feel more comfortable with how things will go.
If this is your first contribution to Porter, we have a tutorial that walks you through how to setup your developer environment, make a change and test it.
Code of Conduct
The Porter community is governed by our Code of Conduct. This includes but isn’t limited to: the porter and related mixin repositories, slack, interactions on social media, project meetings, conferences and meetups.
Find an issue
Use the getporter.org/find-issue link to find good first issues for new contributors and help wanted issues for our other contributors.
When you have been contributing for a while, take a look at the “Backlog” column on our project board for high priority issues. The project board is at the organization level, so it contains issues from across all the Porter repositories.
good first issueshas extra information to help you make your first contribution.
help wantedare issues suitable for someone who isn’t a core maintainer.
hmm 🛑🤔issues should be avoided. They are not ready to be worked on yet because they are not finished being designed or we aren’t sure if we want the feature, etc.
Maintainers will do their best to regularly make new issues for you to solve and then help out as you work on them. 💖
We have a roadmap that will give you a good idea of the larger features that we are working on right now. That may help you decide what you would like to work on after you have tackled an issue or two to learn how to contribute to Porter. If you have a big idea for Porter, learn how to propose a change to Porter.
When you create your first pull request, add your name to the bottom of our Contributors list. Thank you for making Porter better! 🙇♀️
Which branch to use
Unless the issue specifically mentions a branch, please created your feature branch from the release/v1 branch.
# Make sure you have the most recent changes to release/v1 git checkout release/v1 git pull
Create a branch based on release/v1 named MY_FEATURE_BRANCH
git checkout -b MY_FEATURE_BRANCH
When to open a pull request
It’s OK to submit a PR directly for problems such as misspellings or other things where the motivation/problem is unambiguous.
If there isn’t an issue for your PR, please make an issue first and explain the problem or motivation for the change you are proposing. When the solution isn’t straightforward, for example, “Implement missing command X”, then also outline your proposed solution. Your PR will go smoother if the solution is agreed upon before you’ve spent a lot of time implementing it.
Since Porter is a CLI, the “solution” will usually look like this:
$ porter newcommand [OPTIONAL] [--someflag VALUE] example output
How to test your pull request
We recommend running the following every time:
mage Build TestUnit
If your test modified anything related to running a bundle, also run:
If you want to know all the targets that the CI runs, look at <build/azure-pipelines.pr-automatic.yml>.
How to get your pull request reviewed fast
🚧 If you aren’t done yet, create a draft pull request or put WIP in the title so that reviewers wait for you to finish before commenting.
1️⃣ Limit your pull request to a single task. Don’t tackle multiple unrelated things, especially refactoring. If you need large refactoring for your change, chat with a maintainer first, then do it in a separate PR first without any functionality changes.
🎳 Group related changes into separate commits to make it easier to review.
😅 Make requested changes in new commits. Please don’t amend or rebase commits that we have already reviewed. When your pull request is ready to merge, you can rebase your commits yourself, or we can squash when we merge. Just let us know what you are more comfortable with.
🚀 We encourage follow-on PRs and a reviewer may let you know in their comment if it is okay for their suggestion to be done in a follow-on PR. You can decide to make the change in the current PR immediately, or agree to tackle it in a reasonable amount of time in a subsequent pull request. If you can’t get to it soon, please create an issue and link to it from the pull request comment so that we don’t collectively forget.
Signing your commits
You can automatically sign your commits to meet the DCO requirement for this
project by running the following command:
Licensing is important to open source projects. It provides some assurances that the software will continue to be available based under the terms that the author(s) desired. We require that contributors sign off on commits submitted to our project’s repositories. The Developer Certificate of Origin (DCO) is a way to certify that you wrote and have the right to contribute the code you are submitting to the project.
You sign-off by adding the following to your commit messages:
Author: Your Name <email@example.com> Date: Thu Feb 2 11:41:15 2018 -0800
This is my commit message Signed-off-by: Your Name <firstname.lastname@example.org>
Signed-off-by lines match. If they don’t, the PR will
be rejected by the automated DCO check.
Git has a
-s command line option to do this automatically:
git commit -s -m 'This is my commit message'
If you forgot to do this and have not yet pushed your changes to the remote repository, you can amend your commit with the sign-off by running
git commit --amend -s
The life of a pull request
You create a draft or WIP pull request. Reviewers will ignore it mostly unless you mention someone and ask for help. Feel free to open one and use the pull request to see if the CI passes. Once you are ready for a review, remove the WIP or click “Ready for Review” and leave a comment that it’s ready for review.
If you create a regular pull request, a reviewer won’t wait to review it.
A reviewer will assign themselves to the pull request. If you don’t see anyone assigned after 3 business days, you can leave a comment asking for a review, or ping in slack. Sometimes we have busy days, sick days, weekends and vacations, so a little patience is appreciated! 🙇♀️
The reviewer will leave feedback.
nits: These are suggestions that you may decide to incorporate into your pull request or not without further comment.
- It can help to put a 👍 on comments that you have implemented so that you can keep track.
- It is okay to clarify if you are being told to make a change or if it is a suggestion.
After you have made the changes (in new commits please!), leave a comment. If 3 business days go by with no review, it is okay to bump.
When a pull request has been approved, the reviewer will squash and merge your commits. If you prefer to rebase your own commits, at any time leave a comment on the pull request to let them know that.
At this point your changes are available in the canary release of Porter! After your first pull request is merged, you will be invited to the Contributors team which you may choose to accept (or not). Joining the team lets you have issues in GitHub assigned to you.
A follow-on PR is a pull request that finishes up suggestions from another pull request.
When the core of your changes are good, and it won’t hurt to do more of the changes later, our preference is to merge early, and keep working on it in a subsequent. This allows us to start testing out the changes in our canary builds, and more importantly enables other developers to immediately start building their work on top of yours.
This helps us avoid pull requests to rely on other pull requests. It also avoids pull requests that last for months, and in general we try to not let “perfect be the enemy of the good”. It’s no fun to watch your work sit in purgatory, and it kills contributor momentum.
Our contribution ladder defines the roles and responsibilities for this project and how to participate with the goal of moving from a user to a maintainer.
We have a tutorial that walks you through how to set up your developer environment, make a change and test it.
Here are the key steps, if you run into trouble, the tutorial has more details:
- Install Go version 1.17 or higher.
- Clone this repository with
git clone https://github.com/getporter/porter.git ~/go/src/get.porter.sh/porter.
mage Build Installfrom within the newly cloned repository.
If you are planning on contributing back to the project, you’ll need to fork and clone your fork. If you want to build porter from scratch, you can follow the process above and clone directly from the project.
You now have canary builds of porter and all the mixins installed.
🚧 We are in the process of transitioning from make to mage.
Below are the targets that have been migrated to mage. Our new contributor tutorial explains how to install mage.
Mage targets are not case-sensitive, but in our docs we use camel case to make
it easier to read. You can run either
mage TestSmoke or
mage testsmoke for
- Build builds all binaries, porter and internal mixins.
- BuildClient just builds the porter client for your operating system.
It does not build the porter-runtime binary. Useful when you just want to do a
build and don’t remember the proper way to call
- BuildPorter builds both the porter client and runtime.
- BuildClient just builds the porter client for your operating system. It does not build the porter-runtime binary. Useful when you just want to do a build and don’t remember the proper way to call
- Clean removes artifacts from previous builds and test runs.
- UpdateTestfiles updates the “golden” test files to match the latest test output. This is mostly useful for when you change the schema of porter.yaml which will break TestPorter_PrintManifestSchema. Run this target to fix it. Learn more about golden files.
- Test runs all the tests.
- TestUnit runs the unit tests
- TestSmoke runs a small suite of tests using the Porter CLI to validate that Porter is (mostly) working.
- TestIntegration runs our integration tests, which run the bundles against a test KIND cluster.
- Install installs porter and the mixins from source into $(HOME)/.porter/.
- DocsPreview hosts the docs site. See Preview Documentation.
- DocsGen generates the CLI documentation for the website. This is run automatically by build.
Below are the most common developer tasks. Run a target with
make TARGET, e.g.
setup-dcoinstalls a git commit hook that automatically signsoff your commit messages per the DCO requirement.
We have a few different kinds of tests in Porter. You can run all tests types
Should not rely on Docker, or try to really run bundles without key components
mocked. Most structs have test functions, e.g.
porter.NewTestPorter that are
appropriate for unit tests.
Fast! 🏎💨 This takes about 15s - 3 minutes, depending on your computer hardware.
These tests run parts of Porter, using the Porter structs instead of the cli.
They can use Docker, expect that a cluster is available, etc. These tests all
use functions like
porter.SetupIntegrationTest() to update the underlying
components so that they hit the real filesystem, and don’t mock out stuff like
You must have Docker on your computer to run these tests. The test setup handles creating a Kubernetes cluster and Docker registry. Since they are slow, it is perfectly fine to not run these locally and rely on the CI build that’s triggered when you push commits to your pull request instead.
When I am troubleshooting an integration test, I will run just the single test
locally by using
go test -run TESTNAME ./.... If the test needs infrastructure,
we have scripts that you can use, like
mage StartDockerRegistry or
Slow! 🐢 This takes between 8-16 minutes, depending on your computer hardware.
Smoke tests test Porter using the CLI and quickly identify big problems with a build that would make it unusable.
Short! We want this to always be something you can run in under 3 minutes.
When you run
mage build, the canary* build of mixins are automatically
installed into your bin directory in the root of the repository. You can use
porter mixin install NAME to install the latest released version of a mixin.
* canary = most recent successful build of the “main” branch
If you are developing a plugin and you want to debug it follow these steps:
The plugin to be debugged should be compiled and placed in porters plugin path (e.g. in the Azure plugin case the plugin would be copied to $PORTER_HOME/plugins/azure/.
The following environment variables should be set:
PORTER_RUN_PLUGIN_IN_DEBUGGER should be set to the name of the plugin to be
debugged (e.g. secrets.azure.keyvault to debug the azure secrets plugin)
PORTER_DEBUGGER_PORT should be set to the port number where the delve API will
listen, if not set it defaults to 2345
PORTER_PLUGIN_WORKING_DIRECTORY should be the path to the directory containing
source code for the plugin being executed.
When porter is run it will start delve and attach it to the plugin process, this exposes the delve API so that any delve client can connect to the server and debug the plugin.
mage DocsPreviewto start serving the docs. It will watch the file system for changes.
- Our make rule should open http://localhost:1313/docs to preview the site/docs.
We welcome your contribution to improve our documentation, and we hope it is an easy process! ❤️
Write a blog post
Thank you for writing a post for our blog! 🙇♀️ Here’s what you need to do to create a new blog post and then preview it:
Go to /docs/content/blog and create a new file. Whatever you name the file will be the last part of the URL. For example a file named “porter-collaboration.md” will be located at https://getporter.org/blog/porter-collaboration/.
At the top of the file copy and paste the frontmatter template below. The frontmatter is YAML that instucts the blogging software, Hugo, how to render the blog post.
--- title: "Title of Your Blog Post in Titlecase" description: "SEO description of your post, displayed in search engine results." date: "2020-07-28" authorname: "Your Name" author: "@yourhandle" #Not used to link to github/twitter, but informally that's what people put here authorlink: "https://link/to/your/website" # link to your personal website, github, social media... authorimage: "https://link/to/your/profile/picture" # Optional, https://github.com/yourhandle.png works great tags:  # Optional, look at other pages and pick tags that are already in use, e.g. ["mixins"] ---
Preview the website and click “Blog” at the top right to find your blog post.
When you create a pull request, look at the checks run by the pull request, and click “Details” on the netlify/porter/deploy-preview one to see a live preview of your pull request.
Our pull request preview and the live site will not show posts with a date in the future. If you don’t see your post, change the date to today’s date.
View a trace of a Porter command
Porter can send trace data about the commands run to an OpenTelemetry backend. It can be very helpful when figuring out why a command failed because you can see the values of variables and stack traces.
In development, you can use the otel-jaeger bundle to set up a development instance of Jaeger, which gives you a nice website to see each command run.
porter install --reference ghcr.io/getporter/examples/otel-jaeger:v0.1.0 --allow-docker-host-access
Then to turn on tracing in Porter, set the following environment variables. This tells Porter to turn on tracing, and connect to OpenTelemetry server that you just installed.
export PORTER_TELEMETRY_ENABLED="true" export OTEL_EXPORTER_OTLP_PROTOCOL="grpc" export OTEL_EXPORTER_OTLP_INSECURE="true"
$env:PORTER_TELEMETRY_ENABLED="true" $env:OTEL_EXPORTER_OTLP_PROTOCOL="grpc" $env:OTEL_EXPORTER_OTLP_INSECURE="true"
Next run a Porter command to generate some trace data, such as
Then go to the Jaeger website to see your data: http://localhost:16686.
On the Jaeger dashboard, select “porter” from the service drop down, and click “Find Traces”.
The smoke and integration tests will run with telemetry enabled when the PORTER_TEST_TELEMETRY_ENABLED environment variable is true.
Our commands are documented at https://getporter.org/cli and that documentation is
generated by our CLI. You should regenerate that documentation when you change
any files in cmd/porter by running
mage DocsGen which is run every time
Work on the Porter Operator
Instructions for building the Porter Operator from source are located in its repository: https://github.com/getporter/operator. Sometimes you may need to make changes to Porter and work on the Operator at the same time. Here’s how to build porter so that you can use it locally:
- You must be on a feature branch. Not release/v1 or main. This matters because it affects the generated docker image tag.
- Deploy the operator to a KinD cluster by running
mage deployfrom inside the operator repository. That cluster has a local registry running that you can publish to, and it will pull images from it, running on localhost:5000.
- Run the following command from the porter repository to build the Porter Agent image, and publish it
to the test cluster’s registry.
mage XBuildAll LocalPorterAgentBuild.
- Edit your AgentConfig in the Porter Operator and set it to use your local build of the porter-agent.
apiVersion: porter.sh/v1 kind: AgentConfig metadata: name: porter namespace: test # You may need to change this depending on what you are testing spec: porterRepository: localhost:5000/porter-agent porterVersion: canary-dev serviceAccount: porter-agent
Code structure and practices
Carolyn Van Slyck gave a talk about the design of Porter, Designing Command-Line Tools People Love that you may find helpful in understanding the why’s behind its command grammar, package structure, use of dependency injection and testing strategies.
What is the general code layout?
- cmd: go here to add a new command or flag to porter or one of the mixins in this repository
- docs: our website
- build: implements building the invocation image.
- cache: handles the cache of bundles that have been pulled by commands
porter install --reference.
- cnab: deals with the CNAB spec
- cnab-to-oci: talking to an OCI registry.
- config-adapter: converting porter.yaml to bundle.json.
- extensions: extensions to the CNAB spec, at this point that’s just dependencies.
- provider: the CNAB runtime, i.e.
- config: anything related to
- context: essentially dependency injection that’s needed throughout Porter, such as stdout, stderr, stdin, filesystem and command execution.
- exec: the exec mixin
- mixin: enums, functions and interfaces for the mixin framework.
- feed: works with mixin atom feeds
- provider: handles communicating with mixins
- porter: the implementation of the porter commands. Every command in Porter
has a corresponding function in here.
- version: reusable library used by all the mixins for implementing a mixin
- secrets: used to access porter’s secret store through plugins.
- storage: used to access porter’s data store through plugins.
- templates: files that need to be compiled into the porter binary with version command.
- install: Porter installation scripts
- setup-dco: Set up automatic DCO signoff for the developer environment
- tests have Go-based integration tests.
Print to the
Out property for informational messages and send debug messages to the
fmt.Fprintln(p.Out, "Initiating battlestar protocol") fmt.Fprintln(p.Err, "DEBUG: loading plans from r2d2...")
Most of the structs in Porter have an embedded
get.porter.sh/porter/pkg/context.Context struct. This has both
Err which represent stdout and stderr respectively. You should log to those
instead of directly to stdout/stderr because that is how we capture output in
our unit tests. That means use
fmt.Fprint* instead of
fmt.Print* so that you
can pass in
Some of our commands are designed to be consumed by another tool and intermixing
debug lines and the command output would make the resulting output unusable. For
porter schema outputs a json schema and if log lines were sent to
stdout as well, then the resulting json schema would be unparsable. This is why
we send regular command output to
Out and debug information to
allows us to then run the command and see the debug output separately, like so
porter schema --debug 2> err.log.
Some changes in Porter break our compatibility with previous versions of Porter. When that happens, we need to release that change with a new major version number to indicate to users that it contains breaking changes. When you realize that you may need to make a breaking change, discuss it with a maintainer on the issue or pull request and we’ll come up with a plan for how it should be released. Here are some examples of breaking changes:
- The schema of porter.yaml changed.
- The schema of Porter’s file formats changed.
- The schema of Porter’s config file changed.
- Flags or behavior of a CLI command changed, such as removing a flag or adding a validation that can result in a hard error, preventing the command from running.
All of Porter’s documents have a schemaVersion field and when the schema of the document is changed, the version number should be incremented as well in the default set on new documents, the supported schema version constant in the code, and in the documentation for that document.
This section includes overviews of infrastructure Porter relies on, mostly intended for maintainers.
See the CDN Setup Doc for details on the services Porter uses to host and distribute its release binaries.
Custom Windows CI Agent
Some of our tests need to run on Windows, like the Smoke Tests - Windows stage of our build pipeline. We use a custom Windows agent registered with Azure Pipelines that we build and maintain ourselves. See the Custom Windows CI Agent documentation for details on how the agent is created and configured.
Our version strategy explains how we version the project, when you should expect breaking changes in a release, and the process for the v1 release.