depenv: implement UnmarshalText

config/depenv/depenv.go

@@ -1,6 +1,9 @@
 package depenv
 
-import "os"
+import (
+	"fmt"
+	"os"
+)
 
 var manageServers = map[DeploymentEnvironment]string{
 	DeployDevel: "https://manage.askdev.grundclock.com",
@@ -65,3 +68,16 @@ func (d DeploymentEnvironment) APIHost() string {
 func (d DeploymentEnvironment) ManageURL(path string) string {
 	return manageServers[d] + path
 }
+
+func (d *DeploymentEnvironment) UnmarshalText(text []byte) error {
+	s := string(text)
+	if s == "" {
+		return nil
+	}
+	env := DeploymentEnvironmentFromString(s)
+	if env == DeployUndefined {
+		return fmt.Errorf("invalid deployment environment: %s", s)
+	}
+	*d = env
+	return nil
+}