Class: Gem::Commands::InstallCommand

# File 'lib/rubygems/commands/install_command.rb', line 139

def check_version # :nodoc:
  if options[:version] != Gem::Requirement.default &&
     get_all_gem_names.size > 1
    alert_error "Can't use --version with multiple gems. You can specify multiple gems with" \
                " version requirements using `gem install 'my_gem:1.0.0' 'my_other_gem:~>2.0.0'`"
    terminate_interaction 1
  end
end

# File 'lib/rubygems/commands/install_command.rb', line 50

def defaults_str # :nodoc:
  "--both --version '#{Gem::Requirement.default}' --no-force\n" \
    "--install-dir #{Gem.dir} --lock\n" +
    install_update_defaults_str
end

# File 'lib/rubygems/commands/install_command.rb', line 56

def description # :nodoc:
  <<-EOF
The install command installs local or remote gem into a gem repository.

For gems with executables ruby installs a wrapper file into the executable
directory by default.  This can be overridden with the --no-wrappers option.
The wrapper allows you to choose among alternate gem versions using _version_.

For example `rake _0.7.3_ --version` will run rake version 0.7.3 if a newer
version is also installed.

Gem Dependency Files
====================

RubyGems can install a consistent set of gems across multiple environments
using `gem install -g` when a gem dependencies file (gem.deps.rb, Gemfile or
Isolate) is present.  If no explicit file is given RubyGems attempts to find
one in the current directory.

When the RUBYGEMS_GEMDEPS environment variable is set to a gem dependencies
file the gems from that file will be activated at startup time.  Set it to a
specific filename or to "-" to have RubyGems automatically discover the gem
dependencies file by walking up from the current directory.

NOTE: Enabling automatic discovery on multiuser systems can lead to
execution of arbitrary code when used from directories outside your control.

Extension Install Failures
==========================

If an extension fails to compile during gem installation the gem
specification is not written out, but the gem remains unpacked in the
repository.  You may need to specify the path to the library's headers and
libraries to continue.  You can do this by adding a -- between RubyGems'
options and the extension's build options:

$ gem install some_extension_gem
[build fails]
Gem files will remain installed in \\
/path/to/gems/some_extension_gem-1.0 for inspection.
Results logged to /path/to/gems/some_extension_gem-1.0/gem_make.out
$ gem install some_extension_gem -- --with-extension-lib=/path/to/lib
[build succeeds]
$ gem list some_extension_gem

*** LOCAL GEMS ***

some_extension_gem (1.0)
$

If you correct the compilation errors by editing the gem files you will need
to write the specification by hand.  For example:

$ gem install some_extension_gem
[build fails]
Gem files will remain installed in \\
/path/to/gems/some_extension_gem-1.0 for inspection.
Results logged to /path/to/gems/some_extension_gem-1.0/gem_make.out
$ [cd /path/to/gems/some_extension_gem-1.0]
$ [edit files or what-have-you and run make]
$ gem spec ../../cache/some_extension_gem-1.0.gem --ruby > \\
           #../../specifications/some_extension_gem-1.0.gemspec
$ gem list some_extension_gem

*** LOCAL GEMS ***

some_extension_gem (1.0)
$

Command Alias
==========================

You can use `i` command instead of `install`.

$ gem i GEMNAME

  EOF
end

# File 'lib/rubygems/commands/install_command.rb', line 148

def execute
  if options.include? :gemdeps
    install_from_gemdeps
    return # not reached
  end

  @installed_specs = []

  ENV.delete "GEM_PATH" if options[:install_dir].nil?

  check_version

  load_hooks

  exit_code = install_gems

  show_installed

  say update_suggestion if eligible_for_update?

  terminate_interaction exit_code
end

# File 'lib/rubygems/commands/install_command.rb', line 171

def install_from_gemdeps # :nodoc:
  require_relative "../request_set"
  rs = Gem::RequestSet.new

  specs = rs.install_from_gemdeps options do |req, inst|
    s = req.full_spec

    if inst
      say "Installing #{s.name} (#{s.version})"
    else
      say "Using #{s.name} (#{s.version})"
    end
  end

  @installed_specs = specs

  terminate_interaction
end

# File 'lib/rubygems/commands/install_command.rb', line 190

def install_gem(name, version) # :nodoc:
  return if options[:conservative] &&
            !Gem::Dependency.new(name, version).matching_specs.empty?

  req = Gem::Requirement.create(version)

  dinst = Gem::DependencyInstaller.new options

  request_set = dinst.resolve_dependencies name, req

  if options[:explain]
    say "Gems to install:"

    request_set.sorted_requests.each do |activation_request|
      say "  #{activation_request.full_name}"
    end
  else
    @installed_specs.concat request_set.install options
  end

  show_install_errors dinst.errors
end

# File 'lib/rubygems/commands/install_command.rb', line 213

def install_gems # :nodoc:
  exit_code = 0

  get_all_gem_names_and_versions.each do |gem_name, gem_version|
    gem_version ||= options[:version]
    domain = options[:domain]
    domain = :local unless options[:suggest_alternate]
    suppress_suggestions = (domain == :local)

    begin
      install_gem gem_name, gem_version
    rescue Gem::InstallError => e
      alert_error "Error installing #{gem_name}:\n\t#{e.message}"
      exit_code |= 1
    rescue Gem::UnsatisfiableDependencyError => e
      show_lookup_failure e.name, e.version, e.errors, suppress_suggestions,
                          "'#{gem_name}' (#{gem_version})"

      exit_code |= 2
    end
  end

  exit_code
end

# File 'lib/rubygems/commands/install_command.rb', line 241

def load_hooks # :nodoc:
  if options[:install_as_default]
    require_relative "../install_default_message"
  else
    require_relative "../install_message"
  end
  require_relative "../rdoc"
end

# File 'lib/rubygems/commands/install_command.rb', line 250

def show_install_errors(errors) # :nodoc:
  return unless errors

  errors.each do |x|
    next unless Gem::SourceFetchProblem === x

    require_relative "../uri"
    msg = "Unable to pull data from '#{Gem::Uri.redact(x.source.uri)}': #{x.error.message}"

    alert_warning msg
  end
end

# File 'lib/rubygems/commands/install_command.rb', line 263

def show_installed # :nodoc:
  return if @installed_specs.empty?

  gems = @installed_specs.length == 1 ? "gem" : "gems"
  say "#{@installed_specs.length} #{gems} installed"
end

# File 'lib/rubygems/commands/install_command.rb', line 135

def usage # :nodoc:
  "#{program_name} [options] GEMNAME [GEMNAME ...] -- --build-flags"
end