refactor(tvix/glue): move builtins into separate directory

Change-Id: I25b7197458dbfbde8623545dc0a0286eb2744f10
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9911
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Reviewed-by: raitobezarius <tvl@lahfa.xyz>

tvix/glue/src/builtins/derivation_error.rs

@@ -0,0 +1,27 @@
+//! Contains [crate::builtins::DerivationError].
+use nix_compat::{derivation::DerivationError, nixhash};
+use std::rc::Rc;
+use thiserror::Error;
+
+/// Errors related to derivation construction
+#[derive(Debug, Error)]
+pub enum Error {
+    #[error("an output with the name '{0}' is already defined")]
+    DuplicateOutput(String),
+    #[error("fixed-output derivations can only have the default `out`-output")]
+    ConflictingOutputTypes,
+    #[error("the environment variable '{0}' has already been set in this derivation")]
+    DuplicateEnvVar(String),
+    #[error("invalid derivation parameters: {0}")]
+    InvalidDerivation(DerivationError),
+    #[error("invalid output hash: {0}")]
+    InvalidOutputHash(nixhash::Error),
+    #[error("invalid output hash mode: '{0}', only 'recursive' and 'flat` are supported")]
+    InvalidOutputHashMode(String),
+}
+
+impl From<Error> for tvix_eval::ErrorKind {
+    fn from(err: Error) -> Self {
+        tvix_eval::ErrorKind::TvixError(Rc::new(err))
+    }
+}