fixes most of #1404

remaining:
lib/capistrano/configuration/question.rb:41:7: W: Do not suppress exceptions.
      rescue Errno::EIO
      ^^^^^^^^^^^^^^^^^
spec/support/Vagrantfile:8:47: W: Shadowing outer local variable - config.
    config.vm.define(role, primary: true) do |config|
                                              ^^^^^^

features/step_definitions/assertions.rb

@@ -50,26 +50,26 @@ end
 
 Then(/^the deploy\.rb file is created$/) do
   file = TestApp.test_app_path.join('config/deploy.rb')
-  expect(File.exists?(file)).to be true
+  expect(File.exist?(file)).to be true
 end
 
 Then(/^the default stage files are created$/) do
   staging = TestApp.test_app_path.join('config/deploy/staging.rb')
   production = TestApp.test_app_path.join('config/deploy/production.rb')
-  expect(File.exists?(staging)).to be true
-  expect(File.exists?(production)).to be true
+  expect(File.exist?(staging)).to be true
+  expect(File.exist?(production)).to be true
 end
 
 Then(/^the tasks folder is created$/) do
   path = TestApp.test_app_path.join('lib/capistrano/tasks')
-  expect(Dir.exists?(path)).to be true
+  expect(Dir.exist?(path)).to be true
 end
 
 Then(/^the specified stage files are created$/) do
   qa = TestApp.test_app_path.join('config/deploy/qa.rb')
   production = TestApp.test_app_path.join('config/deploy/production.rb')
-  expect(File.exists?(qa)).to be true
-  expect(File.exists?(production)).to be true
+  expect(File.exist?(qa)).to be true
+  expect(File.exist?(production)).to be true
 end
 
 Then(/^it creates the file with the remote_task prerequisite$/) do

features/support/remote_command_helpers.rb

@@ -15,7 +15,7 @@ module RemoteCommandHelpers
     %{[ -#{type} "#{path}" ]}
   end
 
-  def safely_remove_file(path)
+  def safely_remove_file(_path)
     run_vagrant_command("rm #{test_file}") rescue VagrantHelpers::VagrantSSHCommandError
   end
 end

lib/capistrano/application.rb

@@ -63,7 +63,8 @@ module Capistrano
 
     def display_error_message(ex)
       unless options.backtrace
-        if loc = Rake.application.find_rakefile_location
+        loc = Rake.application.find_rakefile_location
+        if loc
           whitelist = (@imported.dup << loc[0]).map{|f| File.absolute_path(f, loc[1])}
           pattern = %r@^(?!#{whitelist.map{|p| Regexp.quote(p)}.join('|')})@
           Rake.application.options.suppress_backtrace_pattern = pattern
@@ -101,7 +102,7 @@ module Capistrano
     def version
       ['--version', '-V',
        "Display the program version.",
-       lambda { |value|
+       lambda { |_value|
          puts "Capistrano Version: #{Capistrano::VERSION} (Rake Version: #{RAKEVERSION})"
          exit
        }
@@ -111,7 +112,7 @@ module Capistrano
     def dry_run
       ['--dry-run', '-n',
        "Do a dry run without executing actions",
-       lambda { |value|
+       lambda { |_value|
          Configuration.env.set(:sshkit_backend, SSHKit::Backend::Printer)
        }
       ]

lib/capistrano/configuration/server.rb

@@ -98,7 +98,7 @@ module Capistrano
           @properties[key]
         end
 
-        def respond_to?(method, include_all=false)
+        def respond_to?(method, _include_all=false)
           @properties.has_key?(method)
         end
 

lib/capistrano/configuration/servers.rb

@@ -9,7 +9,8 @@ module Capistrano
 
       def add_host(host, properties={})
         new_host = Server[host]
-        if server = servers.find { |s| s.matches? new_host }
+        server = servers.find { |s| s.matches? new_host }
+        if server
           server.user = new_host.user if new_host.user
           server.port = new_host.port if new_host.port
           server.with(properties)

lib/capistrano/git.rb

@@ -8,7 +8,7 @@ class Capistrano::Git < Capistrano::SCM
   #
   def git(*args)
     args.unshift :git
-    context.execute *args
+    context.execute(*args)
   end
 
   # The Capistrano default strategy for git. You should want to use this.
@@ -30,7 +30,8 @@ class Capistrano::Git < Capistrano::SCM
     end
 
     def release
-      if tree = fetch(:repo_tree)
+      tree = fetch(:repo_tree)
+      if tree
         tree = tree.slice %r#^/?(.*?)/?$#, 1
         components = tree.split('/').size
         git :archive, fetch(:branch), tree, "| tar -x --strip-components #{components} -f - -C", release_path

lib/capistrano/hg.rb

@@ -6,7 +6,7 @@ class Capistrano::Hg < Capistrano::SCM
   # execute hg in context with arguments
   def hg(*args)
     args.unshift(:hg)
-    context.execute *args
+    context.execute(*args)
   end
 
   module DefaultStrategy
@@ -27,7 +27,8 @@ class Capistrano::Hg < Capistrano::SCM
     end
 
     def release
-      if tree = fetch(:repo_tree)
+      tree = fetch(:repo_tree)
+      if tree
         tree = tree.slice %r#^/?(.*?)/?$#, 1
         components = tree.split('/').size
         hg "archive --type tgz -p . -I", tree, "--rev", fetch(:branch), "| tar -x --strip-components #{components} -f - -C", release_path

lib/capistrano/scm.rb

@@ -25,7 +25,7 @@ module Capistrano
 
     # Call test in context
     def test!(*args)
-      context.test *args
+      context.test(*args)
     end
 
     # The repository URL according to the context

lib/capistrano/svn.rb

@@ -3,13 +3,13 @@ load File.expand_path("../tasks/svn.rake", __FILE__)
 require 'capistrano/scm'
 
 class Capistrano::Svn < Capistrano::SCM
-  
+
   # execute svn in context with arguments
   def svn(*args)
     args.unshift(:svn)
     args.push "--username #{fetch(:svn_username)}" if fetch(:svn_username)
     args.push "--password #{fetch(:svn_password)}" if fetch(:svn_password)
-    context.execute *args
+    context.execute(*args)
   end
 
   module DefaultStrategy

lib/capistrano/tasks/console.rake

@@ -5,7 +5,8 @@ task :console do
   loop do
     print "#{stage}> "
 
-    if input = $stdin.gets
+    input = $stdin.gets
+    if input
       command = input.chomp
     else
       command = 'exit'

lib/capistrano/tasks/deploy.rake

@@ -59,7 +59,7 @@ namespace :deploy do
     desc 'Check directories of files to be linked exist in shared'
     task :make_linked_dirs do
       next unless any? :linked_files
-      on release_roles :all do |host|
+      on release_roles :all do
         execute :mkdir, '-p', linked_file_dirs(shared_path)
       end
     end

lib/capistrano/tasks/install.rake

@@ -18,7 +18,7 @@ task :install do
   entries += envs.split(',').map { |stage| {template: stage_rb, file: deploy_dir.join("#{stage}.rb")} }
 
   entries.each do |entry|
-    if File.exists?(entry[:file])
+    if File.exist?(entry[:file])
       warn "[skip] #{entry[:file]} already exists"
     else
       File.open(entry[:file], 'w+') do |f|
@@ -30,7 +30,7 @@ task :install do
 
   mkdir_p tasks_dir
 
-  if File.exists?('Capfile')
+  if File.exist?('Capfile')
     warn "[skip] Capfile already exists"
   else
     FileUtils.cp(capfile, 'Capfile')

spec/lib/capistrano/application_spec.rb

@@ -34,7 +34,7 @@ describe Capistrano::Application do
   end
 
   it "overrides the rake method, and sets the sshkit_backend to SSHKit::Backend::Printer" do
-    out, _ = capture_io do
+    _out, _ = capture_io do
       flags '--dry-run', '-n'
     end
     sshkit_backend = Capistrano::Configuration.fetch(:sshkit_backend)
@@ -51,7 +51,7 @@ describe Capistrano::Application do
 
   def command_line(*options)
     options.each { |opt| ARGV << opt }
-    def subject.exit(*args)
+    def subject.exit(*_args)
       throw(:system_exit, :exit)
     end
     subject.run

spec/lib/capistrano/configuration/filter_spec.rb

@@ -13,7 +13,7 @@ module Capistrano
       describe '#new' do
         it "won't create an invalid type of filter" do
           expect {
-            f = Filter.new(:zarg)
+            Filter.new(:zarg)
           }.to raise_error RuntimeError
         end
 

spec/lib/capistrano/dsl/task_enhancements_spec.rb

@@ -19,7 +19,7 @@ module Capistrano
 
       let(:order) { [] }
       let!(:task) do
-        Rake::Task.define_task('task', [:order]) do |t, args|
+        Rake::Task.define_task('task', [:order]) do |_, args|
           args['order'].push 'task'
         end
       end
@@ -67,11 +67,11 @@ module Capistrano
       end
 
       it 'invokes in proper order and with arguments and block' do
-        task_enhancements.after('task', 'after_task_custom', :order) do |t, args|
+        task_enhancements.after('task', 'after_task_custom', :order) do
           order.push 'after_task'
         end
 
-        task_enhancements.before('task', 'before_task_custom', :order) do |t, args|
+        task_enhancements.before('task', 'before_task_custom', :order) do
           order.push 'before_task'
         end
 

spec/support/tasks/root.rake

@@ -4,7 +4,7 @@ task :am_i_root do
     ident = capture :id, '-a'
     info "I am #{ident}"
   end
-  on roles(:all) do |host|
+  on roles(:all) do
     ident = capture :id, '-a'
     info "I am #{ident}"
   end