fix startup without active appprovider driver

storage/pkg/command/appprovider.go

@@ -81,6 +81,19 @@ func AppProvider(cfg *config.Config) *cli.Command {
 
 // appProviderConfigFromStruct will adapt an oCIS config struct into a reva mapstructure to start a reva service.
 func appProviderConfigFromStruct(c *cli.Context, cfg *config.Config) map[string]interface{} {
+	drivers := map[string]interface{}{}
+	if cfg.Reva.AppProvider.Driver == "wopi" {
+		drivers = map[string]interface{}{
+			"wopi": map[string]interface{}{
+				"app_name":             "CS3 WOPI server",
+				"insecure_connections": cfg.Reva.AppProvider.WopiDriver.Insecure,
+				"iop_secret":           cfg.Reva.AppProvider.WopiDriver.IopSecret,
+				"wopi_url":             cfg.Reva.AppProvider.WopiDriver.WopiURL,
+				"app_url":              cfg.Reva.AppProvider.WopiDriver.AppURL,
+			},
+		}
+	}
+
 	rcfg := map[string]interface{}{
 		"core": map[string]interface{}{
 			"max_cpus":             cfg.Reva.AppProvider.MaxCPUs,
@@ -99,16 +112,8 @@ func appProviderConfigFromStruct(c *cli.Context, cfg *config.Config) map[string]
 			"services": map[string]interface{}{
 				"appprovider": map[string]interface{}{
 					"app_provider_url": cfg.Reva.AppProvider.ExternalAddr,
-					"driver":           "wopi", //TODO: make configurable
-					"drivers": map[string]interface{}{
-						"wopi": map[string]interface{}{
-							"app_name":             "CS3 WOPI server",
-							"insecure_connections": cfg.Reva.AppProvider.WopiDriver.Insecure,
-							"iop_secret":           cfg.Reva.AppProvider.WopiDriver.IopSecret,
-							"wopi_url":             cfg.Reva.AppProvider.WopiDriver.WopiURL,
-							"app_url":              cfg.Reva.AppProvider.WopiDriver.AppURL,
-						},
-					},
+					"driver":           cfg.Reva.AppProvider.Driver,
+					"drivers":          drivers,
 				},
 			},
 		},

storage/pkg/config/config.go

@@ -43,6 +43,7 @@ type StorageRegistry struct {
 type AppProvider struct {
 	Port
 	ExternalAddr string
+	Driver       string
 	WopiDriver   WopiDriver
 }
 

storage/pkg/flagset/appprovider.go

@@ -53,6 +53,14 @@ func AppProviderWithConfig(cfg *config.Config) []cli.Flag {
 			EnvVars: []string{"APP_PROVIDER_BASIC_SERVICES"},
 		},
 
+		&cli.StringFlag{
+			Name:        "driver",
+			Value:       flags.OverrideDefaultString(cfg.Reva.AppProvider.Driver, ""),
+			Usage:       "Driver to use for app provider",
+			EnvVars:     []string{"APP_PROVIDER_DRIVER"},
+			Destination: &cfg.Reva.AppProvider.Driver,
+		},
+
 		// WOPI driver
 		&cli.StringFlag{
 			Name:        "wopi-driver-iopsecret",