Make some traces into a log, remove others

app.go

@@ -239,7 +239,6 @@ func askUsernamePasswordIfPossible() error {
 	_, err := os.Stat(configfile)
 	if !os.IsNotExist(err) {
 		// do nothing, file exists
-		trace("File %s exists, won't ask for password", configfile)
 		return nil
 	}
 	if !terminal.IsTerminal(int(os.Stdin.Fd())) {

helpers.go

@@ -134,6 +134,13 @@ func parseParametersFromBody(r io.Reader) (map[string]string, error) {
 // ---------------------
 // debug logging helpers
 // ---------------------
+func _Func() string {
+	pc := make([]uintptr, 10) // at least 1 entry needed
+	runtime.Callers(2, pc)
+	f := runtime.FuncForPC(pc[0])
+	return path.Base(f.Name())
+}
+
 func trace(format string, args ...interface{}) {
 	pc := make([]uintptr, 10) // at least 1 entry needed
 	runtime.Callers(2, pc)

upgrade.go

@@ -32,7 +32,7 @@ func upgradeConfig() error {
 	}
 
 	schemaVersionInterface, ok := diskConfig["schema_version"]
-	trace("schemaVersionInterface = %v, ok = %v", schemaVersionInterface, ok)
+	log.Printf("%s(): got schema version %v", _Func(), schemaVersionInterface)
 	if !ok {
 		// no schema version, set it to 0
 		schemaVersionInterface = 0
@@ -84,7 +84,7 @@ func upgradeConfigSchema(oldVersion int, diskConfig *map[string]interface{}) err
 }
 
 func upgradeSchema0to1(diskConfig *map[string]interface{}) error {
-	trace("Called")
+	log.Printf("%s(): called", _Func())
 
 	// The first schema upgrade:
 	// No more "dnsfilter.txt", filters are now kept in data/filters/