refactor(tvix/glue): Make a single errors.rs module r/7596

To pave the way for adding a new error type for builtins in this crate,
move DerivationError to a new builtins::errors module.

Change-Id: I65fcad63e43ed40ad39c2c6540a2ab80fdd90fd4
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11016
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>
Autosubmit: aspen <root@gws.fyi>

1 files changed, 27 insertions, 0 deletions

diff --git a/tvix/glue/src/builtins/errors.rs b/tvix/glue/src/builtins/errors.rs
new file mode 100644
index 000000000000..b606aa6a7c48
--- /dev/null
+++ b/tvix/glue/src/builtins/errors.rs
@@ -0,0 +1,27 @@
+//! Contains errors that can occur during evaluation of builtins in this crate
+use nix_compat::nixhash;
+use std::rc::Rc;
+use thiserror::Error;
+
+/// Errors related to derivation construction
+#[derive(Debug, Error)]
+pub enum DerivationError {
+    #[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(#[from] nix_compat::derivation::DerivationError),
+    #[error("invalid output hash: {0}")]
+    InvalidOutputHash(#[from] nixhash::Error),
+    #[error("invalid output hash mode: '{0}', only 'recursive' and 'flat` are supported")]
+    InvalidOutputHashMode(String),
+}
+
+impl From<DerivationError> for tvix_eval::ErrorKind {
+    fn from(err: DerivationError) -> Self {
+        tvix_eval::ErrorKind::TvixError(Rc::new(err))
+    }
+}