Class: Kar::CargoTask::CargoBuilder

Inherits:
Gem::Ext::CargoBuilder
  • Object
show all
Defined in:
lib/kar/cargotask.rb

Instance Method Summary collapse

Instance Method Details

#build(extension, dest_path, results, args = [], lib_dir = nil, cargo_dir = Dir.pwd, target_rbconfig = Gem.target_rbconfig) ⇒ Object

Original Gem::Ext::CargoBuilder removes compiled files after installation. It is ideal for installation, but not for development. We override the behavior to keep the compiled files.

Raises:

  • (DylibNotFoundError) 


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# File 'lib/kar/cargotask.rb', line 119

def build(extension, dest_path, results, args = [], lib_dir = nil, cargo_dir = Dir.pwd,
          target_rbconfig=Gem.target_rbconfig)
  require "tempfile"
  require "fileutils"

  if target_rbconfig.path
    warn "--target-rbconfig is not yet supported for Rust extensions. Ignoring"
  end

  # Where's the Cargo.toml of the crate we're building
  cargo_toml = File.join(cargo_dir, "Cargo.toml")
  # What's the crate's name
  crate_name = cargo_crate_name(cargo_dir, cargo_toml, results)

  # Run the build
  cmd = cargo_command(cargo_toml, cargo_dir, args, crate_name)
  runner.call(cmd, results, "cargo", cargo_dir, build_env)

  # Where do we expect Cargo to write the compiled library
  dylib_path = cargo_dylib_path(cargo_dir, crate_name)

  # Helpful error if we didn't find the compiled library
  raise DylibNotFoundError, cargo_dir unless File.exist?(dylib_path)

  # Cargo and Ruby differ on how the library should be named, rename from
  # what Cargo outputs to what Ruby expects
  dlext_name = "#{crate_name}.#{makefile_config("DLEXT")}"
  dlext_path = File.join(File.dirname(dylib_path), dlext_name)
  FileUtils.cp(dylib_path, dlext_path)

  nesting = extension_nesting(extension)

  if Gem.install_extension_in_lib && lib_dir
    nested_lib_dir = File.join(lib_dir, nesting)
    FileUtils.mkdir_p nested_lib_dir
    FileUtils.cp_r dlext_path, nested_lib_dir, remove_destination: true
  end

  # move to final destination
  nested_dest_path = File.join(dest_path, nesting)
  FileUtils.mkdir_p nested_dest_path
  FileUtils.cp_r dlext_path, nested_dest_path, remove_destination: true

  results
end