Class: Language::Python::Virtualenv::Virtualenv

Inherits:
Object
  • Object
show all
Defined in:
brew/Library/Homebrew/language/python.rb

Overview

Convenience wrapper for creating and installing packages into Python virtualenvs.

Instance Method Summary collapse

Constructor Details

#initialize(formula, venv_root, python) ⇒ Virtualenv

Initializes a Virtualenv instance. This does not create the virtualenv on disk; #create does that.

Parameters:

  • formula (Formula) —

    the active Formula

  • venv_root (Pathname, String) —

    the path to the root of the virtualenv

  • python (String) —

    which interpreter to use, i.e. “python” or “python2”



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# File 'brew/Library/Homebrew/language/python.rb', line 178

def initialize(formula, venv_root, python)
  @formula = formula
  @venv_root = Pathname.new(venv_root)
  @python = python
end

Instance Method Details

#create ⇒ void

This method returns an undefined value.

Obtains a copy of the virtualenv library and creates a new virtualenv on disk.



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# File 'brew/Library/Homebrew/language/python.rb', line 187

def create
  return if (@venv_root/"bin/python").exist?

  @formula.resource("homebrew-virtualenv").stage do |stage|
    old_pythonpath = ENV.delete "PYTHONPATH"
    begin
      staging = Pathname.new(stage.staging.tmpdir)
      ENV.prepend_create_path "PYTHONPATH", staging/"target"/Language::Python.site_packages(@python)
      @formula.system @python, *Language::Python.setup_install_args(staging/"target")
      @formula.system @python, "-s", staging/"target/bin/virtualenv", "-p", @python, @venv_root
    ensure
      ENV["PYTHONPATH"] = old_pythonpath
    end
  end

  # Robustify symlinks to survive python patch upgrades
  @venv_root.find do |f|
    next unless f.symlink?
    next unless (rp = f.realpath.to_s).start_with? HOMEBREW_CELLAR

    python = rp.include?("python@2") ? "python@2" : "python"
    new_target = rp.sub %r{#{HOMEBREW_CELLAR}/#{python}/[^/]+}, Formula[python].opt_prefix
    f.unlink
    f.make_symlink new_target
  end

  Pathname.glob(@venv_root/"lib/python*/orig-prefix.txt").each do |prefix_file|
    prefix_path = prefix_file.read
    python = prefix_path.include?("python@2") ? "python@2" : "python"
    prefix_path.sub! %r{^#{HOMEBREW_CELLAR}/#{python}/[^/]+}, Formula[python].opt_prefix
    prefix_file.atomic_write prefix_path
  end
end

#pip_install(targets) ⇒ void

This method returns an undefined value.

Installs packages represented by targets into the virtualenv.

Parameters:

  • targets (String, Pathname, Resource, Array<String, Pathname, Resource>) —

    (A) token(s) passed to pip representing the object to be installed. This can be a directory containing a setup.py, a Resource which will be staged and installed, or a package identifier to be fetched from PyPI. Multiline strings are allowed and treated as though they represent the contents of a requirements.txt.



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# File 'brew/Library/Homebrew/language/python.rb', line 230

def pip_install(targets)
  targets = [targets] unless targets.is_a? Array
  targets.each do |t|
    if t.respond_to? :stage
      next if t.name == "homebrew-virtualenv"

      t.stage { do_install Pathname.pwd }
    else
      t = t.lines.map(&:strip) if t.respond_to?(:lines) && t =~ /\n/
      do_install t
    end
  end
end

#pip_install_and_link(targets) ⇒ void

This method returns an undefined value.

Installs packages represented by targets into the virtualenv, but unlike #pip_install also links new scripts to Formula#bin.

Parameters:

  • targets (String, Pathname, Resource, Array<String, Pathname, Resource>) —

    (A) token(s) passed to pip representing the object to be installed. This can be a directory containing a setup.py, a Resource which will be staged and installed, or a package identifier to be fetched from PyPI. Multiline strings are allowed and treated as though they represent the contents of a requirements.txt.



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# File 'brew/Library/Homebrew/language/python.rb', line 248

def pip_install_and_link(targets)
  bin_before = Dir[@venv_root/"bin/*"].to_set

  pip_install(targets)

  bin_after = Dir[@venv_root/"bin/*"].to_set
  bin_to_link = (bin_after - bin_before).to_a
  @formula.bin.install_symlink(bin_to_link)
end