refactor(buf_copy): remove unused code

Author: xtqqczze

src/uucore/src/lib/features/buf_copy.rs

@@ -9,8 +9,6 @@
 //! used by utilities to work around the limitations of Rust's `fs::copy` which
 //! does not handle copying special files (e.g pipes, character/block devices).
 
-pub mod common;
-
 #[cfg(any(target_os = "linux", target_os = "android"))]
 pub mod linux;
 #[cfg(any(target_os = "linux", target_os = "android"))]

src/uucore/src/lib/features/buf_copy/common.rs

@@ -13,8 +13,6 @@ use std::{
     os::fd::{AsFd, AsRawFd},
 };
 
-use super::common::Error;
-
 /// A readable file descriptor.
 pub trait FdReadable: Read + AsRawFd + AsFd {}
 
@@ -25,13 +23,6 @@ pub trait FdWritable: Write + AsFd + AsRawFd {}
 
 impl<T> FdWritable for T where T: Write + AsFd + AsRawFd {}
 
-/// Conversion from a `rustix::io::Errno` into our `Error` which implements `UError`.
-impl From<rustix::io::Errno> for Error {
-    fn from(error: rustix::io::Errno) -> Self {
-        Self::Io(std::io::Error::from(error))
-    }
-}
-
 /// Copy data from `Read` implementor `source` into a `Write` implementor
 /// `dest`. This works by reading a chunk of data from `source` and writing the
 /// data to `dest` in a loop.