homebrew-core/Formula/w/wazero.rb at d05423f13e0587a30a2b763de7942f91582dbc4c · Homebrew/homebrew-core · GitHub

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class Wazero < Formula
  desc "Zero dependency WebAssembly runtime"
  homepage "https://wazero.io"
  url "https://github.com/tetratelabs/wazero/archive/refs/tags/v1.12.0.tar.gz"
  sha256 "81afcc5576db589dda5403f71aa5ae2593222a7ba9671007484bf0ce6e21e7ba"
  license "Apache-2.0"

  livecheck do
    url :stable
    regex(/^v?(\d+(?:\.\d+)+)$/i)
  end

  bottle do
    sha256 cellar: :any_skip_relocation, arm64_tahoe:   "2b48c99c3b9ee63f59d9ed32d7f5ae4c40551248686bd4cd2434044d16c59b03"
    sha256 cellar: :any_skip_relocation, arm64_sequoia: "2b48c99c3b9ee63f59d9ed32d7f5ae4c40551248686bd4cd2434044d16c59b03"
    sha256 cellar: :any_skip_relocation, arm64_sonoma:  "2b48c99c3b9ee63f59d9ed32d7f5ae4c40551248686bd4cd2434044d16c59b03"
    sha256 cellar: :any_skip_relocation, sonoma:        "820d56ab8fdc93c8305eb50378f794c2aff267ce59efc008cace240fd0674332"
    sha256 cellar: :any_skip_relocation, arm64_linux:   "112def4207427435ec33263a919ba870e0e75332ae0e8113a92bfb1ca6f9f70f"
    sha256 cellar: :any,                 x86_64_linux:  "3100242d33d61d5d21e3c19b9962e392cc5c4a5077725005a12f3d20bc9ca553"
  end

  depends_on "go" => :build
  depends_on "wabt" => :test

  def install
    ldflags = %W[
      -s -w
      -X github.com/tetratelabs/wazero/internal/version.version=#{version}
    ]
    system "go", "build", *std_go_args(ldflags:), "./cmd/wazero"
  end

  test do
    assert_equal version.to_s, shell_output("#{bin}/wazero version").chomp

    (testpath/"mount.wat").write <<~EOS
      ;; print the preopen directory path (guest side of the mount).
      (module
        (import "wasi_snapshot_preview1" "fd_prestat_get"
          (func $wasi.fd_prestat_get (param i32 i32) (result i32)))

        (import "wasi_snapshot_preview1" "fd_prestat_dir_name"
          (func $wasi.fd_prestat_dir_name (param i32 i32 i32) (result i32)))

        (import "wasi_snapshot_preview1" "fd_write"
          (func $wasi.fd_write (param i32 i32 i32 i32) (result i32)))

        (memory (export "memory") 1 1)

        (func $main (export "_start")
          ;; First, we need to know the size of the prestat dir name.
          (call $wasi.fd_prestat_get
            (i32.const 3) ;; preopen FD
            (i32.const 0)) ;; where to write prestat
          (drop) ;; ignore the errno returned

          ;; Next, write the dir name to offset 8 (past the prestat).
          (call $wasi.fd_prestat_dir_name
            (i32.const 3) ;; preopen FD
            (i32.const 8) ;; where to write dir_name
            (i32.load (i32.const 4))) ;; length is the last part of the prestat
          (drop) ;; ignore the errno returned

          ;; Now, convert the prestat to an iovec [offset, len] writing offset=8.
          (i32.store (i32.const 0) (i32.const 8))

          ;; Finally, copy the dirname to stdout via its iovec [offset, len].
          (call $wasi.fd_write
            (i32.const 1) ;; stdout
            (i32.const 0) ;; where's the iovec
            (i32.const 1) ;; only one iovec
            (i32.const 0)) ;; overwrite the iovec with the ignored result.
          (drop) ;; ignore the errno returned
        )
      )
    EOS

    system "wat2wasm", testpath/"mount.wat", "-o", testpath/"mount.wasm"

    assert_equal "/homebrew",
      shell_output("#{bin}/wazero run -mount=/tmp:/homebrew #{testpath/"mount.wasm"}")
  end
end