Error when compose and force_host_vm are enabled together

plugins/providers/docker/config.rb

@@ -281,6 +281,10 @@ module VagrantPlugins
           errors << I18n.t("docker_provider.errors.config.compose_configuration_hash")
         end
 
+        if @compose && @force_host_vm
+          errors << I18n.t("docker_provider.errors.config.compose_force_vm")
+        end
+
         if !@create_args.is_a?(Array)
           errors << I18n.t("docker_provider.errors.config.create_args_array")
         end

templates/locales/providers_docker.yml

@@ -145,6 +145,8 @@ en:
           One of "build_dir" or "image" must be set
         compose_configuration_hash: |-
           "compose_configuration" must be a hash
+        compose_force_vm: |-
+          Docker compose is not currently supported from within proxy VM.
         create_args_array: |-
           "create_args" must be an array
         invalid_link: |-

test/unit/plugins/providers/docker/config_test.rb

@@ -89,6 +89,25 @@ describe VagrantPlugins::DockerProvider::Config do
     end
   end
 
+  describe "#compose" do
+    before do
+      valid_defaults
+    end
+
+    it "should be valid when enabled" do
+      subject.compose = true
+      subject.finalize!
+      assert_valid
+    end
+
+    it "should be invalid when force_host_vm is enabled" do
+      subject.compose = true
+      subject.force_host_vm = true
+      subject.finalize!
+      assert_invalid
+    end
+  end
+
   describe "#create_args" do
     before do
       valid_defaults