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Contributing to Packer

First: if you're unsure or afraid of anything, just ask or submit the issue or pull request anyways. You won't be yelled at for giving your best effort. The worst that can happen is that you'll be politely asked to change something. We appreciate any sort of contributions, and don't want a wall of rules to get in the way of that.

However, for those individuals who want a bit more guidance on the best way to contribute to the project, read on. This document will cover what we're looking for. By addressing all the points we're looking for, it raises the chances we can quickly merge or address your contributions.

Issues

Reporting an Issue

Make sure you test against the latest released version. It is possible we already fixed the bug you're experiencing.
Run the command with debug ouput with the environment variable PACKER_LOG. For example: PACKER_LOG=1 packer build template.json. Take the entire output and create a gist for linking to in your issue. Packer should strip sensitive keys from the output, but take a look through just in case.
Provide a reproducible test case. If a contributor can't reproduce an issue, then it dramatically lowers the chances it'll get fixed. And in some cases, the issue will eventually be closed.
Respond promptly to any questions made by the Packer team to your issue. Stale issues will be closed.

Issue Lifecycle

The issue is reported.
The issue is verified and categorized by a Packer collaborator. Categorization is done via tags. For example, bugs are marked as "bugs" and easy fixes are marked as "easy".
Unless it is critical, the issue is left for a period of time (sometimes many weeks), giving outside contributors a chance to address the issue.
The issue is addressed in a pull request or commit. The issue will be referenced in the commit message so that the code that fixes it is clearly linked.
The issue is closed.

Setting up Go to work on Packer

If you have never worked with Go before, you will have to complete the following steps in order to be able to compile and test Packer.

Download and install Go. Make sure your Go version is at least Go 1.5. Packer may work with older versions of Go but these are not supported.
Set and export the GOPATH environment variable and update your PATH. For example, you can add to your .bash_profile. If you're using Go 1.5 also set GO15VENDOREXPERIMENT. This is not necessary for Go 1.6 and up.
```
export GOPATH=$HOME/Documents/golang
export GO15VENDOREXPERIMENT=1
export PATH=$PATH:$GOPATH/bin
```
Download the Packer source (and its dependencies) by running go get github.com/mitchellh/packer. This will download the Packer source to $GOPATH/src/github.com/mitchellh/packer.
When working on packer cd $GOPATH/src/github.com/mitchellh/packer so you can run make and easily access other files.
Make your changes to the Packer source. You can run make in $GOPATH/src/github.com/mitchellh/packer to run tests and build the packer binary. Any compilation errors will be shown when the binaries are rebuilding.
After running make successfully, use $GOPATH/src/github.com/mitchellh/packer/bin/packer to build a machine and verify your changes work.
If everything works well and the tests pass, run go fmt on your code before submitting a pull-request.

Tips for Working on Packer

Godeps

If you are submitting a change that requires a change in dependencies, DO NOT update the vendor/ folder. This keeps the PR smaller and easier to review. Instead, please indicate which upstream has changed and which version we should be using. You may do this using Godeps/Godeps.json but this is not required.

Running Unit Tests

You can run tests for individual packages using commands like this:

$ make test TEST=./builder/amazon/...

Running Acceptance Tests

Packer has acceptance tests for various builders. These typically require an API key (AWS, GCE), or additional software to be installed on your computer (VirtualBox, VMware).

If you're working on a feature of a builder or a new builder and want verify it is functioning (and also hasn't broken anything else), we recommend running the acceptance tests.

Warning: The acceptance tests create/destroy/modify real resources, which may incur real costs in some cases. In the presence of a bug, it is technically possible that broken backends could leave dangling data behind. Therefore, please run the acceptance tests at your own risk. At the very least, we recommend running them in their own private account for whatever builder you're testing.

To run the acceptance tests, invoke make testacc:

$ make testacc TEST=./builder/amazon/ebs
...

The TEST variable lets you narrow the scope of the acceptance tests to a specific package / folder. The TESTARGS variable is recommended to filter down to a specific resource to test, since testing all of them at once can sometimes take a very long time.

Acceptance tests typically require other environment variables to be set for things such as access keys. The test itself should error early and tell you what to set, so it is not documented here.

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