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Merge pull request #8285 from hashicorp/document-code-generation 

Document how code generation works a little in .github/CONTRIBUTING.md
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Megan Marsh 2019-10-29 09:25:55 -07:00 committed by GitHub
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.github/CONTRIBUTING.md vendored
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@ -246,6 +246,19 @@ start](https://github.com/golang/go/wiki/Modules#quick-start) for examples.
Please only apply the minimal vendor changes to get your PR to work. Packer
does not attempt to track the latest version for each dependency.
#### Code generation
Packer relies on `go generate` to generate a [peg parser for boot
commands](https://github.com/hashicorp/packer/blob/master/common/bootcommand/boot_command.go),
[docs](https://github.com/hashicorp/packer/blob/master/website/source/partials/builder/amazon/chroot/_Config-not-required.html.md)
and HCL2's bridging code. Packer's testing suite will run `make check-generate`
to check that all the generated files Packer needs are what they should be.
`make generate` re-generates all these file and can take a while depending on
your machine's performances. To make it faster it is recommended to run
localized code generation. Say you are working on the Amazon builder: running
`go generate ./builder/amazon/...` will do that for you. Make sure that the
latest code generation tool is installed by running `make install-gen-deps`.
#### Running Unit Tests
You can run tests for individual packages using commands like this: