make storage users mount id configurable (#5091)

services/gateway/pkg/config/config.go

@@ -80,9 +80,10 @@ type GRPCConfig struct {
 }
 
 type StorageRegistry struct {
-	Driver string   `yaml:"driver"` //TODO: configure via env?
-	Rules  []string `yaml:"rules"`  //TODO: configure via env?
-	JSON   string   `yaml:"json"`   //TODO: configure via env?
+	Driver              string   `yaml:"driver"` //TODO: configure via env?
+	Rules               []string `yaml:"rules"`  //TODO: configure via env?
+	JSON                string   `yaml:"json"`   //TODO: configure via env?
+	StorageUsersMountID string   `yaml:"storage_users_mount_id" env:"GATEWAY_STORAGE_USERS_MOUNT_ID" desc:"Mount ID of this storage. This ID needs to be unique."`
 }
 
 // Cache holds cache config

services/gateway/pkg/config/parser/parse.go

@@ -2,13 +2,14 @@ package parser
 
 import (
 	"errors"
+	"fmt"
 
 	ociscfg "github.com/owncloud/ocis/v2/ocis-pkg/config"
+	defaults2 "github.com/owncloud/ocis/v2/ocis-pkg/config/defaults"
+	"github.com/owncloud/ocis/v2/ocis-pkg/config/envdecode"
 	"github.com/owncloud/ocis/v2/ocis-pkg/shared"
 	"github.com/owncloud/ocis/v2/services/gateway/pkg/config"
 	"github.com/owncloud/ocis/v2/services/gateway/pkg/config/defaults"
-
-	"github.com/owncloud/ocis/v2/ocis-pkg/config/envdecode"
 )
 
 // ParseConfig loads configuration from known paths.
@@ -42,5 +43,13 @@ func Validate(cfg *config.Config) error {
 		return shared.MissingRevaTransferSecretError(cfg.Service.Name)
 	}
 
+	if cfg.StorageRegistry.StorageUsersMountID == "" {
+		return fmt.Errorf("The storage users mount ID has not been configured for %s. "+
+			"Make sure your %s config contains the proper values "+
+			"(e.g. by running ocis init or setting it manually in "+
+			"the config/corresponding environment variable).",
+			"gateway", defaults2.BaseConfigPath())
+	}
+
 	return nil
 }

services/gateway/pkg/revaconfig/config.go

@@ -123,11 +123,10 @@ func spacesProviders(cfg *config.Config, logger log.Logger) map[string]map[strin
 		}
 		return rules
 	}
-
 	// generate rules based on default config
 	return map[string]map[string]interface{}{
 		cfg.StorageUsersEndpoint: {
-			"providerid": "1284d238-aa92-42ce-bdc4-0b0000009157",
+			"providerid": cfg.StorageRegistry.StorageUsersMountID,
 			"spaces": map[string]interface{}{
 				"personal": map[string]interface{}{
 					"mount_point":   "/users",