Return error from adminInitDatabase()

...instead of doing os.Exit(). This allows the func to be used in many
places (as it is) and handle success results in different ways.

Previously, this caused the single-user configuration process to exit
prematurely. This fixes that and closes #71.

app.go

@@ -234,7 +234,11 @@ func Serve() {
 			defer shutdown(app)
 
 			if !app.db.DatabaseInitialized() {
-				adminInitDatabase(app)
+				err = adminInitDatabase(app)
+				if err != nil {
+					log.Error(err.Error())
+					os.Exit(1)
+				}
 			}
 
 			u := &User{
@@ -289,7 +293,12 @@ func Serve() {
 		loadConfig(app)
 		connectToDatabase(app)
 		defer shutdown(app)
-		adminInitDatabase(app)
+		err := adminInitDatabase(app)
+		if err != nil {
+			log.Error(err.Error())
+			os.Exit(1)
+		}
+		os.Exit(0)
 	} else if *createAdmin != "" {
 		adminCreateUser(app, *createAdmin, true)
 	} else if *createUser != "" {
@@ -581,7 +590,7 @@ func adminCreateUser(app *app, credStr string, isAdmin bool) {
 	os.Exit(0)
 }
 
-func adminInitDatabase(app *app) {
+func adminInitDatabase(app *app) error {
 	schemaFileName := "schema.sql"
 	if app.cfg.Database.Type == driverSQLite {
 		schemaFileName = "sqlite.sql"
@@ -589,8 +598,7 @@ func adminInitDatabase(app *app) {
 
 	schema, err := Asset(schemaFileName)
 	if err != nil {
-		log.Error("Unable to load schema file: %v", err)
-		os.Exit(1)
+		return fmt.Errorf("Unable to load schema file: %v", err)
 	}
 
 	tblReg := regexp.MustCompile("CREATE TABLE (IF NOT EXISTS )?`([a-z_]+)`")
@@ -618,10 +626,9 @@ func adminInitDatabase(app *app) {
 	log.Info("Updating appmigrations table...")
 	err = migrations.SetInitialMigrations(migrations.NewDatastore(app.db.DB, app.db.driverName))
 	if err != nil {
-		log.Error("Unable to set initial migrations: %v", err)
-		os.Exit(1)
+		return fmt.Errorf("Unable to set initial migrations: %v", err)
 	}
-	log.Info("Done.")
 
-	os.Exit(0)
+	log.Info("Done.")
+	return nil
 }