fix(initialize): also check for unknown coreos keys

initialize/config.go

@@ -45,20 +45,38 @@ type CloudConfig struct {
 
 type warner func(format string, v ...interface{})
 
+// warnOnUnrecognizedKeys parses the contents of a cloud-config file and calls
+// warn(msg, key) for every unrecognized key (i.e. those not present in CloudConfig)
 func warnOnUnrecognizedKeys(contents string, warn warner) {
 	// Generate a map of all understood cloud config options
 	var cc map[string]interface{}
 	b, _ := goyaml.Marshal(&CloudConfig{})
 	goyaml.Unmarshal(b, &cc)
+
 	// Now unmarshal the entire provided contents
 	var c map[string]interface{}
 	goyaml.Unmarshal([]byte(contents), &c)
+
 	// Check that every key in the contents exists in the cloud config
 	for k, _ := range c {
 		if _, ok := cc[k]; !ok {
 			warn("Warning: unrecognized key %q in provided cloud config - ignoring section", k)
 		}
 	}
+
+	// Finally, check for unrecognized coreos options, if any are set
+	coreos, ok := c["coreos"]
+	if !ok {
+		return
+	}
+	set := coreos.(map[interface{}]interface{})
+	known := cc["coreos"].(map[interface{}]interface{})
+	for k, _ := range set {
+		key := k.(string)
+		if _, ok := known[key]; !ok {
+			warn("Warning: unrecognized key %q in coreos section of provided cloud config - ignoring", key)
+		}
+	}
 }
 
 // NewCloudConfig instantiates a new CloudConfig from the given contents (a

initialize/config_test.go

@@ -11,10 +11,12 @@ func TestCloudConfigUnknownKeys(t *testing.T) {
 coreos: 
   etcd:
     discovery: "https://discovery.etcd.io/827c73219eeb2fa5530027c37bf18877"
-unknown:
+  coreos_unknown:
+    foo: "bar"
+section_unknown:
   dunno:
     something
-foo:
+bare_unknown:
   bar
 hostname:
   foo
@@ -37,11 +39,14 @@ hostname:
 
 	warnOnUnrecognizedKeys(contents, catchWarn)
 
-	if !strings.Contains(warnings, "foo") {
+	if !strings.Contains(warnings, "coreos_unknown") {
-		t.Errorf("warnings did not catch unrecognized key foo")
+		t.Errorf("warnings did not catch unrecognized coreos option coreos_unknown")
 	}
-	if !strings.Contains(warnings, "unknown") {
+	if !strings.Contains(warnings, "bare_unknown") {
-		t.Errorf("warnings did not catch unrecognized key unknown")
+		t.Errorf("warnings did not catch unrecognized key bare_unknown")
+	}
+	if !strings.Contains(warnings, "section_unknown") {
+		t.Errorf("warnings did not catch unrecognized key section_unknown")
 	}
 }