[rubygems/rubygems] Add 'call for update' to RubyGems install command.

https://github.com/rubygems/rubygems/commit/05811f8248

3 files changed, 86 insertions, 0 deletions

diff --git a/lib/rubygems/commands/install_command.rb b/lib/rubygems/commands/install_command.rb
index 071687c63f..c04c01f258 100644
--- a/lib/rubygems/commands/install_command.rb
+++ b/lib/rubygems/commands/install_command.rb
@@ -5,6 +5,7 @@ require_relative "../dependency_installer"
 require_relative "../local_remote_options"
 require_relative "../validator"
 require_relative "../version_option"
+require_relative "../update_suggestion"
 
 ##
 # Gem installer command line tool
@@ -17,6 +18,7 @@ class Gem::Commands::InstallCommand < Gem::Command
   include Gem::VersionOption
   include Gem::LocalRemoteOptions
   include Gem::InstallUpdateOptions
+  include Gem::UpdateSuggestion
 
   def initialize
     defaults = Gem::DependencyInstaller::DEFAULT_OPTIONS.merge({
@@ -168,6 +170,8 @@ You can use `i` command instead of `install`.
 
     show_installed
 
+    say update_suggestion if eglible_for_update?
+
     terminate_interaction exit_code
   end
 
diff --git a/lib/rubygems/config_file.rb b/lib/rubygems/config_file.rb
index c53e209ae8..b18f4115cc 100644
--- a/lib/rubygems/config_file.rb
+++ b/lib/rubygems/config_file.rb
@@ -371,6 +371,18 @@ if you believe they were disclosed to a third party.
     @backtrace || $DEBUG
   end
 
+  # Check config file is writable. Creates empty file if not present to ensure we can write to it.
+  def config_file_writable?
+    if File.exist?(config_file_name)
+      File.writable?(config_file_name)
+    else
+      require "fileutils"
+      FileUtils.mkdir_p File.dirname(config_file_name)
+      File.open(config_file_name, "w") {}
+      true
+    end
+  end
+
   # The name of the configuration file.
   def config_file_name
     @config_file_name || Gem.config_file
diff --git a/lib/rubygems/update_suggestion.rb b/lib/rubygems/update_suggestion.rb
new file mode 100644
index 0000000000..71c44af3af
--- /dev/null
+++ b/lib/rubygems/update_suggestion.rb
@@ -0,0 +1,70 @@
+# frozen_string_literal: true
+
+##
+# Mixin methods for Gem::Command to promote available RubyGems update
+
+module Gem::UpdateSuggestion
+  # list taken from https://github.com/watson/ci-info/blob/7a3c30d/index.js#L56-L66
+  CI_ENV_VARS = [
+    "CI", # Travis CI, CircleCI, Cirrus CI, Gitlab CI, Appveyor, CodeShip, dsari
+    "CONTINUOUS_INTEGRATION", # Travis CI, Cirrus CI
+    "BUILD_NUMBER", # Jenkins, TeamCity
+    "CI_APP_ID", "CI_BUILD_ID", "CI_BUILD_NUMBER", # Applfow
+    "RUN_ID" # TaskCluster, dsari
+  ].freeze
+
+  ONE_WEEK = 7 * 24 * 60 * 60
+
+  ##
+  # Message to promote available RubyGems update with related gem update command.
+
+  def update_suggestion
+    <<-MESSAGE
+
+A new release of RubyGems is available: #{Gem.rubygems_version} → #{Gem.latest_rubygems_version}!
+Run `gem update --system #{Gem.latest_rubygems_version}` to update your installation.
+
+    MESSAGE
+  end
+
+  ##
+  # Determines if current environment is eglible for update suggestion.
+
+  def eglible_for_update?
+    # explicit opt-out
+    return false if Gem.configuration[:prevent_update_suggestion]
+    return false if ENV["RUBYGEMS_PREVENT_UPDATE_SUGGESTION"]
+
+    # focus only on human usage of final RubyGems releases
+    return false unless Gem.ui.tty?
+    return false if Gem.rubygems_version.prerelease?
+    return false if Gem.disable_system_update_message
+    return false if ci?
+
+    # check makes sense only when we can store of last try
+    # otherwise we will not be able to prevent annoying update message
+    # on each command call
+    return unless Gem.configuration.config_file_writable?
+
+    # load time of last check, ensure the difference is enough to repeat the suggestion
+    check_time = Time.now.to_i
+    last_update_check = Gem.configuration[:last_update_check] || 0
+    return false if (check_time - last_update_check) < ONE_WEEK
+
+    # compare current and latest version, this is the part where
+    # latest rubygems spec is fetched from remote
+    (Gem.rubygems_version < Gem.latest_rubygems_version).tap do |eglible|
+      if eglible
+        # store the time of last successful check into config file
+        Gem.configuration[:last_update_check] = check_time
+        Gem.configuration.write
+      end
+    end
+  rescue # don't block install command on any problem
+    false
+  end
+
+  def ci?
+    CI_ENV_VARS.any? {|var| ENV.include?(var) }
+  end
+end