refactor(tvix/nix-compat): absorb //tvix/derivation

Put this in its src/derivation.

Change-Id: Ic047ab1c2da555a833ee454e10ef60c77537b617
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7967
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
Autosubmit: flokli <flokli@flokli.de>

tvix/cli/Cargo.toml

@@ -8,8 +8,8 @@ name = "tvix"
 path = "src/main.rs"
 
 [dependencies]
+nix-compat = { path = "../nix-compat" }
 tvix-eval = { path = "../eval" }
-tvix-derivation = { path = "../derivation" }
 rustyline = "10.0.0"
 clap = { version = "4.0", features = ["derive", "env"] }
 dirs = "4.0.0"

tvix/cli/src/derivation.rs

@@ -1,10 +1,10 @@
 //! Implements `builtins.derivation`, the core of what makes Nix build packages.
 
 use data_encoding::BASE64;
+use nix_compat::derivation::{Derivation, Hash};
 use std::cell::RefCell;
 use std::collections::{btree_map, BTreeSet};
 use std::rc::Rc;
-use tvix_derivation::{Derivation, Hash};
 use tvix_eval::builtin_macros::builtins;
 use tvix_eval::{AddContext, CoercionKind, ErrorKind, NixAttrs, NixList, Value, VM};
 
@@ -416,9 +416,10 @@ mod derivation_builtins {
 
         // TODO: fail on derivation references (only "plain" is allowed here)
 
-        let path = tvix_derivation::path_with_references(name.as_str(), content.as_str(), refs)
-            .map_err(Error::InvalidDerivation)?
-            .to_absolute_path();
+        let path =
+            nix_compat::derivation::path_with_references(name.as_str(), content.as_str(), refs)
+                .map_err(Error::InvalidDerivation)?
+                .to_absolute_path();
 
         state.borrow_mut().plain(&path);
 

tvix/cli/src/errors.rs

@@ -1,6 +1,6 @@
+use nix_compat::derivation::DerivationError;
 use std::rc::Rc;
 use thiserror::Error;
-use tvix_derivation::DerivationError;
 
 /// Errors related to derivation construction
 #[derive(Debug, Error, PartialEq)]