extend the omnibus command builder with an additional download_path parameter

plugins/provisioners/chef/omnibus.rb

@@ -5,10 +5,10 @@ module VagrantPlugins
 
       # Read more about the Omnibus installer here:
       # https://docs.getchef.com/install_omnibus.html
-      def build_command(version, prerelease = false)
+      def build_command(version, prerelease = false, download_path = nil)
         command = "curl -sL #{OMNITRUCK} | sudo bash"
 
-        if prerelease || version != :latest
+        if prerelease || version != :latest || download_path != nil
           command << " -s --"
         end
 
@@ -20,6 +20,10 @@ module VagrantPlugins
           command << " -v \"#{version}\""
         end
 
+        if download_path
+          command << " -d \"#{download_path}\""
+        end
+
         command
       end
       module_function :build_command

test/unit/plugins/provisioners/chef/omnibus_test.rb

@@ -7,8 +7,9 @@ describe VagrantPlugins::Chef::Omnibus, :focus do
 
   let(:version) { :latest }
   let(:prerelease) { false }
+  let(:download_path) { nil }
 
-  let(:build_command) { described_class.build_command(version, prerelease) }
+  let(:build_command) { described_class.build_command(version, prerelease, download_path) }
 
   context "when prerelease is given" do
     let(:prerelease) { true }
@@ -18,6 +19,14 @@ describe VagrantPlugins::Chef::Omnibus, :focus do
     end
   end
 
+  context "when download_path is given" do
+    let(:download_path) { '/tmp/path/to/omnibuses' }
+
+    it "returns the correct command" do
+      expect(build_command).to eq("#{prefix} | sudo bash -s -- -d \"/tmp/path/to/omnibuses\"")
+    end
+  end
+
   context "when version is :latest" do
     let(:version) { :latest }
 
@@ -34,12 +43,13 @@ describe VagrantPlugins::Chef::Omnibus, :focus do
     end
   end
 
-  context "when prerelease and version are given" do
+  context "when prerelease and version and download_path are given" do
     let(:version) { "1.2.3" }
     let(:prerelease) { true }
+    let(:download_path) { "/some/path" }
 
     it "returns the correct command" do
-      expect(build_command).to eq("#{prefix} | sudo bash -s -- -p -v \"1.2.3\"")
+      expect(build_command).to eq("#{prefix} | sudo bash -s -- -p -v \"1.2.3\" -d \"/some/path\"")
     end
   end
 end