feat: config versions meta schema

.schema/config.schema.json

@@ -4,6 +4,11 @@
   "title": "ORY Kratos Configuration",
   "type": "object",
   "definitions": {
+    "version": {
+      "type": "string",
+      "description": "SemVer according to https://semver.org/ prefixed with `v` as in our releases.",
+      "pattern": "^v(0|[1-9]\\d*)\\.(0|[1-9]\\d*)\\.(0|[1-9]\\d*)(?:-((?:0|[1-9]\\d*|\\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\\.(?:0|[1-9]\\d*|\\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\\+([0-9a-zA-Z-]+(?:\\.[0-9a-zA-Z-]+)*))?$"
+    },
     "defaultReturnTo": {
       "title": "Redirect browsers to set URL per default",
       "description": "ORY Kratos redirects to this URL per default on completion of self-service flows and other browser interaction. Read this [article for more information on browser redirects](https://www.ory.sh/kratos/docs/concepts/browser-redirect-flow-completion).",
@@ -898,6 +903,16 @@
           "additionalProperties": false
         }
       }
+    },
+    "version": {
+      "allOf": [
+        {
+          "title": "The kratos version this config is written for."
+        },
+        {
+          "$ref": "#/definitions/version"
+        }
+      ]
     }
   },
   "allOf": [

.schema/version.schema.json

@@ -0,0 +1,22 @@
+{
+  "$id": "https://github.com/ory/kratos/.schema/versions.config.schema.json",
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "All Versions for ORY Kratos Configuration",
+  "type": "object",
+  "oneOf": [
+    {
+      "allOf": [
+        {
+          "properties": {
+            "version": {
+              "const": "v0.4.6-alpha.1"
+            }
+          }
+        },
+        {
+          "$ref": "https://raw.githubusercontent.com/ory/kratos/v0.4.6-alpha.1/.schema/config.schema.json"
+        }
+      ]
+    }
+  ]
+}

cmd/serve.go

@@ -18,6 +18,8 @@ import (
 	"os"
 	"strconv"
 
+	"github.com/ory/kratos/driver/configuration"
+
 	"github.com/ory/x/viperx"
 
 	"github.com/spf13/cobra"
@@ -48,7 +50,17 @@ DON'T DO THIS IN PRODUCTION!
 		}
 
 		x.WatchAndValidateViper(logger)
-		daemon.ServeAll(driver.MustNewDefaultDriver(logger, BuildVersion, BuildTime, BuildGitHash, dev))(cmd, args)
+		d := driver.MustNewDefaultDriver(logger, BuildVersion, BuildTime, BuildGitHash, dev)
+
+		configVersion := d.Configuration().ConfigVersion()
+		if configVersion == configuration.UnknownVersion {
+			d.Logger().Warn("The config has no version specified. Add the version to improve your development experience.")
+		} else if BuildVersion != "" &&
+			configVersion != BuildVersion {
+			d.Logger().Warnf("Config version is '%s' but kratos runs on version '%s'", configVersion, BuildVersion)
+		}
+
+		daemon.ServeAll(d)(cmd, args)
 	},
 }
 

driver/configuration/provider.go

@@ -115,4 +115,6 @@ type Provider interface {
 	TracingServiceName() string
 	TracingProvider() string
 	TracingJaegerConfig() *tracing.JaegerConfig
+
+	ConfigVersion() string
 }

driver/configuration/provider_viper.go

@@ -36,6 +36,8 @@ const DefaultBrowserReturnURL = "default_browser_return_url"
 
 const DefaultSQLiteMemoryDSN = "sqlite://:memory:?_fk=true"
 
+const UnknownVersion = "unknown version"
+
 const (
 	ViperKeyDSN = "dsn"
 
@@ -101,6 +103,8 @@ const (
 	ViperKeyHasherArgon2ConfigParallelism = "hashers.argon2.parallelism"
 	ViperKeyHasherArgon2ConfigSaltLength  = "hashers.argon2.salt_length"
 	ViperKeyHasherArgon2ConfigKeyLength   = "hashers.argon2.key_length"
+
+	ViperKeyVersion = "version"
 )
 
 func HookStrategyKey(key, strategy string) string {
@@ -534,3 +538,7 @@ func (p *ViperProvider) selfServiceReturnTo(key string, strategy string) *url.UR
 	}
 	return redir
 }
+
+func (p *ViperProvider) ConfigVersion() string {
+	return viperx.GetString(p.l, ViperKeyVersion, UnknownVersion)
+}