in log/initialization.go [65:83]
func listenForSignalHangup(l reopen.Reopener, isMainLogger bool, logFilePath string, sighup chan os.Signal) {
for v := range sighup {
// Specifically, do _not_ write to the log that is being reopened,
// but log this to the _main_ log file instead as the actual log
// might be specialised, eg: an access logger leading to an incorrect entry
logger.WithFields(logrus.Fields{"signal": v, "path": logFilePath}).Print("Reopening log file on signal")
err := l.Reopen()
if err != nil {
if isMainLogger {
// Main logger failed to reopen, last ditch effort to notify the user, but don't
// do this for auxiliary loggers, since we may get double-logs
log.Printf("Unable to reopen log file '%s' after %v. Error %v", logFilePath, v, err)
} else {
logger.WithError(err).WithFields(logrus.Fields{"signal": v, "path": logFilePath}).Print("Failed to reopen log file")
}
}
}
}