Function ostree::checksum_file_at

pub fn checksum_file_at<P: IsA<Cancellable>>(
    dfd: i32, 
    path: &Path, 
    stbuf: Option<&stat>, 
    objtype: ObjectType, 
    flags: ChecksumFlags, 
    cancellable: Option<&P>
) -> Result<GString, Error>

Compute the OSTree checksum of a file.