hypha: move libraries to libs/

libs/xen/xenstore/src/error.rs

@@ -0,0 +1,40 @@
+use std::ffi::{FromVecWithNulError, IntoStringError, NulError};
+use std::io;
+use std::num::ParseIntError;
+use std::str::Utf8Error;
+use std::string::FromUtf8Error;
+
+#[derive(thiserror::Error, Debug)]
+pub enum Error {
+    #[error("io issue encountered")]
+    Io(#[from] io::Error),
+    #[error("utf8 string decode failed")]
+    Utf8DecodeString(#[from] FromUtf8Error),
+    #[error("utf8 str decode failed")]
+    Utf8DecodeStr(#[from] Utf8Error),
+    #[error("unable to decode cstring as utf8")]
+    Utf8DecodeCstring(#[from] IntoStringError),
+    #[error("nul byte found in string")]
+    NulByteFoundString(#[from] NulError),
+    #[error("unable to find nul byte in vec")]
+    VecNulByteNotFound(#[from] FromVecWithNulError),
+    #[error("unable to parse integer")]
+    ParseInt(#[from] ParseIntError),
+    #[error("bus was not found on any available path")]
+    BusNotFound,
+    #[error("store responded with error: `{0}`")]
+    ResponseError(String),
+    #[error("invalid permissions provided")]
+    InvalidPermissions,
+}
+
+impl Error {
+    pub fn is_noent_response(&self) -> bool {
+        match self {
+            Error::ResponseError(message) => message == "ENOENT",
+            _ => false,
+        }
+    }
+}
+
+pub type Result<T> = std::result::Result<T, Error>;