add risc0-errors module

crates/ere-risczero/src/error.rs

@@ -0,0 +1,46 @@
+use std::{io, path::PathBuf, process::ExitStatus};
+use thiserror::Error;
+
+#[derive(Debug, Error)]
+pub enum RiscZeroError {
+    #[error(transparent)]
+    Compile(#[from] CompileError),
+}
+
+#[derive(Debug, Error)]
+pub enum CompileError {
+    #[error("{context}: {source}")]
+    Io {
+        #[source]
+        source: io::Error,
+        context: &'static str,
+    },
+    #[error("{context}: {source}")]
+    SerdeJson {
+        #[source]
+        source: serde_json::Error,
+        context: &'static str,
+    },
+    #[error("Methods crate path does not exist or is not a directory: {0}")]
+    InvalidMethodsPath(PathBuf),
+    #[error(
+        "`cargo build` for {crate_path} failed with status {status}\nstdout:\n{stdout}\nstderr:\n{stderr}"
+    )]
+    CargoBuildFailure {
+        crate_path: PathBuf,
+        status: ExitStatus,
+        stdout: String,
+        stderr: String,
+    },
+    #[error("Could not find field `{field}` in JSON file `{file}`")]
+    MissingJsonField { field: &'static str, file: PathBuf },
+}
+
+impl CompileError {
+    pub fn io(e: io::Error, context: &'static str) -> Self {
+        Self::Io { source: e, context }
+    }
+    pub fn serde(e: serde_json::Error, context: &'static str) -> Self {
+        Self::SerdeJson { source: e, context }
+    }
+}