in src/main/java/com/googlesource/gerrit/plugins/gitiles/FilteredRepository.java [118:125]
private static RepositoryBuilder toBuilder(Repository repo) {
RepositoryBuilder b =
new RepositoryBuilder().setGitDir(repo.getDirectory()).setFS(repo.getFS());
if (!repo.isBare()) {
b.setWorkTree(repo.getWorkTree()).setIndexFile(repo.getIndexFile());
}
return b;
}