in src/main/java/org/apache/maven/plugins/gpg/AbstractGpgMojo.java [339:349]
private void logBestPracticeWarning(String source) {
getLog().warn("");
getLog().warn("W A R N I N G");
getLog().warn("");
getLog().warn("Do not store passphrase in any file (disk or SCM repository),");
getLog().warn("instead rely on GnuPG agent or provide passphrase in ");
getLog().warn(passphraseEnvName + " environment variable for batch mode.");
getLog().warn("");
getLog().warn("Sensitive content loaded from " + source);
getLog().warn("");
}