xenclient: move error to it's own mod

xen/xenclient/src/error.rs

@@ -0,0 +1,60 @@
+use std::fmt::{Display, Formatter};
+use std::string::FromUtf8Error;
+use xencall::XenCallError;
+
+pub type Result<T> = std::result::Result<T, Error>;
+
+#[derive(Debug)]
+pub struct Error {
+    message: String,
+}
+
+impl Error {
+    pub fn new(msg: &str) -> Error {
+        Error {
+            message: msg.to_string(),
+        }
+    }
+}
+
+impl Display for Error {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", self.message)
+    }
+}
+
+impl std::error::Error for Error {
+    fn description(&self) -> &str {
+        &self.message
+    }
+}
+
+impl From<std::io::Error> for Error {
+    fn from(value: std::io::Error) -> Self {
+        Error::new(value.to_string().as_str())
+    }
+}
+
+impl From<xenstore::error::Error> for Error {
+    fn from(value: xenstore::error::Error) -> Self {
+        Error::new(value.to_string().as_str())
+    }
+}
+
+impl From<XenCallError> for Error {
+    fn from(value: XenCallError) -> Self {
+        Error::new(value.to_string().as_str())
+    }
+}
+
+impl From<FromUtf8Error> for Error {
+    fn from(value: FromUtf8Error) -> Self {
+        Error::new(value.to_string().as_str())
+    }
+}
+
+impl From<xenevtchn::error::Error> for Error {
+    fn from(value: xenevtchn::error::Error) -> Self {
+        Error::new(value.to_string().as_str())
+    }
+}