commands/push: validate configuration

/cc @sethvargo - Some weirdness here but overall should work fine. I'm
not sure if there was a GH issue this should be attached to or close. To
explain:

We just use the first machine with the default provider. A
Vagrant::Environment guarantees there is at least one machine, so
`env.machine_names.first` will always work. And we can just use the
default provider because we don't really care. Finally, it can be any
old machine we pass in because we just want the "global" config to
validate and there is no way to say "don't validate machine-specific
configs", so we might as well just pick the first machine to validate.

CHANGELOG.md

@@ -8,8 +8,10 @@ BUG FIXES:
 
   - core: private boxes still referencing vagrantcloud.com will have
       their vagrant login access token properly appended
+  - core: push plugin configuration is properly validated
   - commands/push: push lookups are by user-defined name, not push
       strategy name [GH-4975]
+  - commands/push: validate the configuration
   - guests/arch: fix network configuration due to poor line breaks. [GH-4964]
   - provisioners/chef: remove Chef version check from solo.rb generation and
       make `roles_path` populate correctly

plugins/commands/push/command.rb

@@ -19,6 +19,11 @@ module VagrantPlugins
 
         name = validate_pushes!(@env.pushes, argv[0])
 
+        # Validate the configuration
+        @env.machine(@env.machine_names.first, @env.default_provider).action_raw(
+          :config_validate,
+          Vagrant::Action::Builtin::ConfigValidate)
+
         @logger.debug("'push' environment with strategy: `#{name}'")
         @env.push(name)
 

test/unit/plugins/commands/push/command_test.rb

@@ -6,11 +6,14 @@ describe VagrantPlugins::CommandPush::Command do
   include_context "unit"
   include_context "command plugin helpers"
 
+  let(:iso_env) { isolated_environment }
   let(:env) do
-    isolated_environment.tap do |env|
-      env.vagrantfile("")
-      env.create_vagrant_env
-    end
+    iso_env.vagrantfile(<<-VF)
+Vagrant.configure("2") do |config|
+  config.vm.box = "nope"
+end
+VF
+    iso_env.create_vagrant_env
   end
 
   let(:argv)   { [] }
@@ -35,6 +38,17 @@ describe VagrantPlugins::CommandPush::Command do
       subject.execute
     end
 
+    it "validates the configuration" do
+      iso_env.vagrantfile("")
+
+      subject = described_class.new(argv, iso_env.create_vagrant_env)
+      allow(subject).to receive(:validate_pushes!)
+        .and_return(:noop)
+
+      expect { subject.execute }.to raise_error(
+        Vagrant::Errors::ConfigInvalid)
+    end
+
     it "delegates to Environment#push" do
       expect(env).to receive(:push).once
       subject.execute