summaryrefslogtreecommitdiff
path: root/lib/rubygems/uninstaller.rb
blob: eb150497ca475750f6971c20fa15c5ed2977521a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
#--
# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
# All rights reserved.
# See LICENSE.txt for permissions.
#++

require 'fileutils'
require 'rubygems'
require 'rubygems/dependency_list'
require 'rubygems/rdoc'
require 'rubygems/user_interaction'

##
# 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.

class Gem::Uninstaller

  include Gem::UserInteraction

  ##
  # The directory a gem's executables will be installed into

  attr_reader :bin_dir

  ##
  # The gem repository the gem will be installed into

  attr_reader :gem_home

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

  attr_reader :spec

  ##
  # Constructs an uninstaller that will uninstall +gem+

  def initialize(gem, options = {})
    # TODO document the valid 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]
    @abort_on_dependent = options[:abort_on_dependent]

    # Indicate if development dependencies should be checked when
    # uninstalling. (default: false)
    #
    @check_dev         = options[:check_dev]

    if options[:force]
      @force_all = true
      @force_ignore = true
    end

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

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

  def uninstall
    dependency = Gem::Dependency.new @gem, @version

    list = []

    dirs =
      Gem::Specification.dirs +
      [Gem::Specification.default_specifications_dir]

    Gem::Specification.each_spec dirs do |spec|
      next unless dependency.matches_spec? spec

      list << spec
    end

    default_specs, list = list.partition do |spec|
      spec.default_gem?
    end

    list, other_repo_specs = list.partition do |spec|
      @gem_home == spec.base_dir or
        (@user_install and spec.base_dir == Gem.user_dir)
    end

    if list.empty? then
      if other_repo_specs.empty?
        if default_specs.empty?
          raise Gem::InstallError, "gem #{@gem.inspect} is not installed"
        else
          message =
            "gem #{@gem.inspect} cannot be uninstalled " +
            "because it is a default gem"
          raise Gem::InstallError, message
        end
      end

      other_repos = other_repo_specs.map { |spec| spec.base_dir }.uniq

      message = ["#{@gem} is not installed in GEM_HOME, try:"]
      message.concat other_repos.map { |repo|
        "\tgem uninstall -i #{repo} #{@gem}"
      }

      raise Gem::InstallError, message.join("\n")
    elsif @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

  ##
  # Uninstalls gem +spec+

  def uninstall_gem(spec)
    @spec = spec

    unless dependencies_ok? spec
      if abort_on_dependent? || !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

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

  def remove_executables(spec)
    return if spec.nil? or spec.executables.empty?

    executables = spec.executables.clone

    # Leave any executables created by other installed versions
    # of this gem installed.

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

    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

    if remove then
      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
    else
      say "Executables and scripts will remain installed."
    end
  end

  ##
  # Removes all gems in +list+.
  #
  # NOTE: removes uninstalled gems from +list+.

  def remove_all(list)
    list.each { |spec| uninstall_gem spec }
  end

  ##
  # 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.

  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
    FileUtils.rm_rf spec.extension_install_dir

    old_platform_name = spec.original_name
    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::RDoc.new(spec).remove

    say "Successfully uninstalled #{spec.full_name}"

    Gem::Specification.remove_spec spec
  end

  ##
  # Is +spec+ in +gem_dir+?

  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

  def dependencies_ok?(spec)
    return true if @force_ignore

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

  def abort_on_dependent?
    @abort_on_dependent
  end

  def ask_if_ok(spec)
    msg = ['']
    msg << 'You have requested to uninstall the gem:'
    msg << "\t#{spec.full_name}"
    msg << ''

    siblings = Gem::Specification.select do |s|
                 s.name == spec.name && s.full_name != spec.full_name
               end

    spec.dependent_gems.each do |dep_spec, dep, satlist|
      unless siblings.any? { |s| s.satisfies_requirement? dep }
        msg << "#{dep_spec.name}-#{dep_spec.version} depends on #{dep}"
      end
    end

    msg << 'If you remove this gem, these dependencies will not be met.'
    msg << 'Continue with Uninstall?'
    return ask_yes_no(msg.join("\n"), false)
  end

  def formatted_program_filename(filename)
    # TODO perhaps the installer should leave a small manifest
    # of what it did for us to find rather than trying to recreate
    # it again.
    if @format_executable then
      require 'rubygems/installer'
      Gem::Installer.exec_format % File.basename(filename)
    else
      filename
    end
  end
end