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# Developers Guide
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This guide explains how to set up your environment for developing on
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Helm and Tiller.
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## Prerequisites
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- Go 1.6.0 or later
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- kubectl 1.2 or later
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- A Kubernetes cluster (optional)
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- The gRPC toolchain
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Tiller uses gRPC. To get started with gRPC, you will need to...
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- Install `protoc` for compiling protobuf files. Releases are
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[here](https://github.com/google/protobuf/releases)
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- Install the protoc Go plugin: `go get -u github.com/golang/protobuf/protoc-gen-go`
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Note that you need to be on protobuf 3.x (`protoc --version`) and use the latest Go plugin.
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## The Helm API (HAPI)
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We use gRPC as an API layer. See `pkg/hapi` for the generated Go code,
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and `_proto` for the protocol buffer definitions.
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To regenerate `hapi`, use `go generate pkg/hapi`.
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