chore: checkpoint before Python removal

vendor/russh-sftp/src/error.rs

@@ -0,0 +1,64 @@
+use bytes::TryGetError;
+use std::{fmt, io};
+use thiserror::Error;
+
+use crate::client;
+
+#[derive(Debug, Clone, Error)]
+pub enum Error {
+    #[error("I/O: {0}")]
+    IO(String),
+    #[error("Unexpected EOF on stream")]
+    UnexpectedEof,
+    #[error("Bad message: {0}")]
+    BadMessage(String),
+    #[error("Client error. ({0})")]
+    Client(String),
+    #[error("Unexpected behavior: {0}")]
+    UnexpectedBehavior(String),
+}
+
+impl From<client::error::Error> for Error {
+    fn from(error: client::error::Error) -> Self {
+        Self::Client(error.to_string())
+    }
+}
+
+impl From<io::Error> for Error {
+    fn from(err: io::Error) -> Self {
+        let kind = err.kind();
+        let msg = err.into_inner().map_or("".to_string(), |m| format!("{m}"));
+        match kind {
+            io::ErrorKind::UnexpectedEof => Self::UnexpectedEof,
+            io::ErrorKind::Other if msg == "EOF" => Self::UnexpectedEof,
+            e => Self::IO(e.to_string()),
+        }
+    }
+}
+
+impl From<TryGetError> for Error {
+    fn from(err: TryGetError) -> Self {
+        Self::BadMessage(format!(
+            "only {} bytes remaining, but {} requested",
+            err.available, err.requested
+        ))
+    }
+}
+
+impl serde::ser::Error for Error {
+    fn custom<T>(msg: T) -> Self
+    where
+        T: fmt::Display,
+    {
+        Self::BadMessage(msg.to_string())
+    }
+}
+
+impl serde::de::Error for Error {
+    fn custom<T>(msg: T) -> Self
+    where
+        T: fmt::Display,
+    {
+        Self::BadMessage(msg.to_string())
+    }
+}