require "language/go"

class Packer < Formula
  desc "Tool for creating identical machine images for multiple platforms"
  homepage "https://packer.io"
  url "https://github.com/hashicorp/packer.git",
      :tag => "v1.0.0",
      :revision => "e3d65a193e96c7b228589fc9699e39998ec12e4e"
  head "https://github.com/hashicorp/packer.git"

  bottle do
    cellar :any_skip_relocation
    sha256 "729ecbb484c2e6575ee8f25e3842cc9342cb5785d04e6f842c58ceb9a7c19610" => :sierra
    sha256 "b80c62c882784f5f11df70a10d5ed3708b2b88c72bd9c435f5691710536bc32a" => :el_capitan
    sha256 "1ebf37130fba12a90163c06eb4b5900e2fd538c0431782e0c175034cf8de71f0" => :yosemite
  end

  depends_on :hg => :build
  depends_on "go" => :build
  depends_on "govendor" => :build

  go_resource "github.com/mitchellh/gox" do
    url "https://github.com/mitchellh/gox.git",
        :revision => "c9740af9c6574448fd48eb30a71f964014c7a837"
  end

  go_resource "github.com/mitchellh/iochan" do
    url "https://github.com/mitchellh/iochan.git",
        :revision => "87b45ffd0e9581375c491fef3d32130bb15c5bd7"
  end

  go_resource "golang.org/x/tools" do
    url "https://go.googlesource.com/tools.git",
        :revision => "cbb995d093b2c4a12ac074e53d90373ecc827527"
  end

  def install
    ENV["XC_OS"] = "darwin"
    ENV["XC_ARCH"] = MacOS.prefer_64_bit? ? "amd64" : "386"
    ENV["GOPATH"] = buildpath
    # For the gox buildtool used by packer, which
    # doesn't need to be installed permanently.
    ENV.append_path "PATH", buildpath

    # TODO: remove "else" (mitchellh path) on next release
    if build.head?
      packerpath = buildpath/"src/github.com/hashicorp/packer"
    else
      packerpath = buildpath/"src/github.com/mitchellh/packer"
    end
    packerpath.install Dir["{*,.git}"]
    Language::Go.stage_deps resources, buildpath/"src"

    cd "src/github.com/mitchellh/gox" do
      system "go", "build"
      buildpath.install "gox"
    end

    cd "src/golang.org/x/tools/cmd/stringer" do
      system "go", "build"
      buildpath.install "stringer"
    end

    cd packerpath do
      # We handle this step above. Don't repeat it.
      inreplace "Makefile" do |s|
        s.gsub! "go get github.com/mitchellh/gox", ""
        s.gsub! "go get golang.org/x/tools/cmd/stringer", ""
        s.gsub! "go get github.com/kardianos/govendor", ""
      end

      (buildpath/"bin").mkpath
      if build.head?
        system "make", "bin"
      else
        system "make", "releasebin"
      end
      bin.install buildpath/"bin/packer"
      zsh_completion.install "contrib/zsh-completion/_packer"
      prefix.install_metafiles
    end
  end

  test do
    minimal = testpath/"minimal.json"
    minimal.write <<-EOS.undent
      {
        "builders": [{
          "type": "amazon-ebs",
          "region": "us-east-1",
          "source_ami": "ami-59a4a230",
          "instance_type": "m3.medium",
          "ssh_username": "ubuntu",
          "ami_name": "homebrew packer test  {{timestamp}}"
        }],
        "provisioners": [{
          "type": "shell",
          "inline": [
            "sleep 30",
            "sudo apt-get update"
          ]
        }]
      }
    EOS
    system "#{bin}/packer", "validate", minimal
  end
end