Gem::Uninstaller

An Uninstaller.

The uninstaller fires pre and post uninstall hooks. Hooks can be added either through a rubygems_plugin.rb file in an installed gem or via a rubygems/defaults/#{RUBY_ENGINE}.rb or rubygems/defaults/operating_system.rb file. See Gem.pre_uninstall and Gem.post_uninstall for details.

Attributes

bin_dir[R]

The directory a gem's executables will be installed into

gem_home[R]

The gem repository the gem will be installed into

spec[R]

The Gem::Specification for the gem being uninstalled, only set during uninstall_gem

Public Class Methods

new(gem, options = {}) click to toggle source

Constructs an uninstaller that will uninstall gem

 
               # File rubygems/uninstaller.rb, line 44
def initialize(gem, options = {})
  @gem               = gem
  @version           = options[:version] || Gem::Requirement.default
  @gem_home          = File.expand_path(options[:install_dir] || Gem.dir)
  @force_executables = options[:executables]
  @force_all         = options[:all]
  @force_ignore      = options[:ignore]
  @bin_dir           = options[:bin_dir]
  @format_executable = options[:format_executable]

  # only add user directory if install_dir is not set
  @user_install = false
  @user_install = options[:user_install] unless options[:install_dir]

  if @user_install then
    Gem.use_paths Gem.user_dir, @gem_home
  else
    Gem.use_paths @gem_home
  end
end

Public Instance Methods

ask_if_ok(spec) click to toggle source

 
               # File rubygems/uninstaller.rb, line 247
def ask_if_ok(spec)
  msg = ['']
  msg << 'You have requested to uninstall the gem:'
  msg << "\t#{spec.full_name}"

  spec.dependent_gems.each do |dep_spec, dep, satlist|
    msg <<
      ("#{dep_spec.name}-#{dep_spec.version} depends on " +
       "[#{dep.name} (#{dep.requirement})]")
  end

  msg << 'If you remove this gems, one or more dependencies will not be met.'
  msg << 'Continue with Uninstall?'
  return ask_yes_no(msg.join("\n"), true)
end

dependencies_ok?(spec) click to toggle source

 
               # File rubygems/uninstaller.rb, line 240
def dependencies_ok?(spec)
  return true if @force_ignore

  deplist = Gem::DependencyList.from_specs
  deplist.ok_to_remove?(spec.full_name)
end

formatted_program_filename(filename) click to toggle source

 
               # File rubygems/uninstaller.rb, line 263
def formatted_program_filename(filename)
  if @format_executable then
    require 'rubygems/installer'
    Gem::Installer.exec_format % File.basename(filename)
  else
    filename
  end
end

path_ok?(gem_dir, spec) click to toggle source

Is spec in gem_dir?

 
               # File rubygems/uninstaller.rb, line 233
def path_ok?(gem_dir, spec)
  full_path     = File.join gem_dir, 'gems', spec.full_name
  original_path = File.join gem_dir, 'gems', spec.original_name

  full_path == spec.full_gem_path || original_path == spec.full_gem_path
end

remove(spec) click to toggle source

spec: the spec of the gem to be uninstalled
list: the list of all such gems

Warning: this method modifies the list parameter. Once it has uninstalled a gem, it is removed from that list.

 
               # File rubygems/uninstaller.rb, line 189
def remove(spec)
  unless path_ok?(@gem_home, spec) or
         (@user_install and path_ok?(Gem.user_dir, spec)) then
    e = Gem::GemNotInHomeException.new \
          "Gem is not installed in directory #{@gem_home}"
    e.spec = spec

    raise e
  end

  raise Gem::FilePermissionError, spec.base_dir unless
    File.writable?(spec.base_dir)

  FileUtils.rm_rf spec.full_gem_path

  # TODO: should this be moved to spec?... I vote eww (also exists in docmgr)
  old_platform_name = [spec.name,
                       spec.version,
                       spec.original_platform].join '-'

  gemspec = spec.spec_file

  unless File.exist? gemspec then
    gemspec = File.join(File.dirname(gemspec), "#{old_platform_name}.gemspec")
  end

  FileUtils.rm_rf gemspec

  gem = spec.cache_file
  gem = File.join(spec.cache_dir, "#{old_platform_name}.gem") unless
    File.exist? gem

  FileUtils.rm_rf gem

  Gem::DocManager.new(spec).uninstall_doc

  say "Successfully uninstalled #{spec.full_name}"

  Gem::Specification.remove_spec spec
end

remove_all(list) click to toggle source

Removes all gems in list.

NOTE: removes uninstalled gems from list.

 
               # File rubygems/uninstaller.rb, line 178
def remove_all(list)
  list.each { |spec| uninstall_gem spec }
end

remove_executables(spec) click to toggle source

Removes installed executables and batch files (windows only) for gemspec.

 
               # File rubygems/uninstaller.rb, line 127
def remove_executables(spec)
  return if spec.nil? or spec.executables.empty?

  list = Gem::Specification.find_all { |s|
    s.name == spec.name && s.version != spec.version
  }

  executables = spec.executables.clone

  list.each do |s|
    s.executables.each do |exe_name|
      executables.delete exe_name
    end
  end

  return if executables.empty?

  executables = executables.map { |exec| formatted_program_filename exec }

  remove = if @force_executables.nil? then
             ask_yes_no("Remove executables:\n" \
                        "\t#{executables.join ', '}\n\n" \
                        "in addition to the gem?",
                        true)
           else
             @force_executables
           end

  unless remove then
    say "Executables and scripts will remain installed."
  else
    bin_dir = @bin_dir || Gem.bindir(spec.base_dir)

    raise Gem::FilePermissionError, bin_dir unless File.writable? bin_dir

    executables.each do |exe_name|
      say "Removing #{exe_name}"

      exe_file = File.join bin_dir, exe_name

      FileUtils.rm_f exe_file
      FileUtils.rm_f "#{exe_file}.bat"
    end
  end
end

uninstall() click to toggle source

Performs the uninstall of the gem. This removes the spec, the Gem directory, and the cached .gem file.

 
               # File rubygems/uninstaller.rb, line 69
def uninstall
  list = Gem::Specification.find_all_by_name(@gem, @version)

  if list.empty? then
    raise Gem::InstallError, "gem #{@gem.inspect} is not installed"

  elsif list.size > 1 and @force_all then
    remove_all list

  elsif list.size > 1 then
    gem_names = list.collect {|gem| gem.full_name} + ["All versions"]

    say
    _, index = choose_from_list "Select gem to uninstall:", gem_names

    if index == list.size then
      remove_all list
    elsif index >= 0 && index < list.size then
      uninstall_gem list[index]
    else
      say "Error: must enter a number [1-#{list.size+1}]"
    end
  else
    uninstall_gem list.first
  end
end

uninstall_gem(spec) click to toggle source

Uninstalls gem spec

 
               # File rubygems/uninstaller.rb, line 99
def uninstall_gem(spec)
  @spec = spec

  unless dependencies_ok? spec
    unless ask_if_ok(spec)
      raise Gem::DependencyRemovalException,
        "Uninstallation aborted due to dependent gem(s)"
    end
  end

  Gem.pre_uninstall_hooks.each do |hook|
    hook.call self
  end

  remove_executables @spec
  remove @spec

  Gem.post_uninstall_hooks.each do |hook|
    hook.call self
  end

  @spec = nil
end

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Gem::Uninstaller

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