Tweaks

Vagrantfile

@@ -115,7 +115,7 @@ Vagrant.configure('2') do |config|
       'development' => ['default']
     }
 
-    ansible.tags = tags if ENV['ANSIBLE_TAGS']
+    ansible.tags = ENV['ANSIBLE_TAGS']
 
     ansible.extra_vars = {'vagrant_version' => Vagrant::VERSION}
     if vars = ENV['ANSIBLE_VARS']
@@ -155,7 +155,7 @@ Vagrant.configure('2') do |config|
 end
 
 def local_provisioning?
-  Vagrant::Util::Platform.windows? || !which('ansible-playbook') || ENV['FORCE_ANSIBLE_LOCAL']
+  @local_provisioning ||= Vagrant::Util::Platform.windows? || !which('ansible-playbook') || ENV['FORCE_ANSIBLE_LOCAL']
 end
 
 def local_site_path(site)
@@ -186,12 +186,12 @@ end
 def which(cmd)
   exts = ENV['PATHEXT'] ? ENV['PATHEXT'].split(';') : ['']
 
-  ENV['PATH'].split(File::PATH_SEPARATOR).each do |path|
-    exts.each do |ext|
-      exe = File.join(path, "#{cmd}#{ext}")
-      return exe if File.executable?(exe) && !File.directory?(exe)
-    end
+  paths = ENV['PATH'].split(File::PATH_SEPARATOR).flat_map do |path|
+    exts.map { |ext| File.join(path, "#{cmd}#{ext}") }
   end
 
-  nil
+  paths.any? do |path|
+    next unless File.executable?(path) && !File.directory?(path)
+    !!system("#{path}", %i(out err) => File::NULL)
+  end
 end