From 6f35c75203a06ef78d75a81b020a605ecbb20fdd Mon Sep 17 00:00:00 2001
From: Michael Quigley <michael@quigley.com>
Date: Wed, 12 Jun 2024 13:21:45 -0400
Subject: [PATCH] ZROK_CTRL_CONFIG_VERSION override (#648)

---
 controller/config/config.go | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/controller/config/config.go b/controller/config/config.go
index 8e67f8c0..3a1589d4 100644
--- a/controller/config/config.go
+++ b/controller/config/config.go
@@ -1,6 +1,8 @@
 package config
 
 import (
+	"os"
+	"strconv"
 	"time"
 
 	"github.com/openziti/zrok/controller/emailUi"
@@ -14,7 +16,7 @@ import (
 	"github.com/pkg/errors"
 )
 
-const ConfigVersion = 3
+const ConfigVersion = 4
 
 type Config struct {
 	V             int
@@ -119,8 +121,22 @@ func LoadConfig(path string) (*Config, error) {
 	if err := cf.BindYaml(cfg, path, env.GetCfOptions()); err != nil {
 		return nil, errors.Wrapf(err, "error loading controller config '%v'", path)
 	}
-	if cfg.V != ConfigVersion {
+	if !envVersionOk() && cfg.V != ConfigVersion {
 		return nil, errors.Errorf("expecting configuration version '%v', your configuration is version '%v'; please see zrok.io for changelog and configuration documentation", ConfigVersion, cfg.V)
 	}
 	return cfg, nil
 }
+
+func envVersionOk() bool {
+	vStr := os.Getenv("ZROK_CTRL_CONFIG_VERSION")
+	if vStr != "" {
+		envV, err := strconv.Atoi(vStr)
+		if err != nil {
+			return false
+		}
+		if envV == ConfigVersion {
+			return true
+		}
+	}
+	return false
+}