fn is_writable(&self, _path: &str) -> Result<bool, Self::Error> {
        Ok(true)
    }

}
#[derive(Clone)]
pub struct Sink {}
pub fn sink() -> Sink {
    Sink {}
}
impl WorkingCopyRead for Sink {
    type Error = std::io::Error;
    fn file_metadata(&self, _file: &str) -> Result<InodeMetadata, Self::Error> {
        panic!("file_metadata not implemented: {:?}", _file)
    }
    fn read_file(&self, _file: &str, _buffer: &mut Vec<u8>) -> Result<(), Self::Error> {
        panic!("read_file not implemented: {:?}", _file)
    }
    fn modified_time(&self, _file: &str) -> Result<std::time::SystemTime, Self::Error> {
        panic!("modified_time not implemented: {:?}", _file)
    }

impl WorkingCopy for Sink {
    fn is_writable(&self, _path: &str) -> Result<bool, Self::Error> {
        Ok(false)
    }
    fn create_dir_all(&self, _path: &str) -> Result<(), Self::Error> {
        Ok(())
    }
    fn remove_path(&self, _name: &str, _rec: bool) -> Result<(), Self::Error> {
        Ok(())
    }
    fn rename(&self, _former: &str, _new: &str) -> Result<(), Self::Error> {
        Ok(())
    }
    fn set_permissions(&self, _name: &str, _permissions: u16) -> Result<(), Self::Error> {
        Ok(())
    }
    type Writer = std::io::Sink;
    fn write_file(&self, _file: &str, _inode: Inode) -> Result<Self::Writer, Self::Error> {
        Ok(std::io::sink())
    }
}

            1,

            threads,

    if !repo.is_writable(path).map_err(OutputError::WorkingCopy)? {
        return Ok(());
    }