refactor(tvix/nix-compat): replace calculate_drv_replacement_str r/5995

Call this function derivation_or_fod_hash, and return a NixHash.

This is more in line with how cppnix calls this, and allows using
to_nix_hash_string() in some places.

Change-Id: Iebf5355f08ed5c9a044844739350f829f874f0ce
Reviewed-on: https://cl.tvl.fyi/c/depot/+/8293
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI

1 files changed, 14 insertions, 8 deletions

diff --git a/tvix/cli/src/derivation.rs b/tvix/cli/src/derivation.rs
index 15c4c6f858f7..61c4489954f1 100644
--- a/tvix/cli/src/derivation.rs
+++ b/tvix/cli/src/derivation.rs
@@ -339,21 +339,27 @@ mod derivation_builtins {
         // eval data structures.
         drv.validate(false).map_err(Error::InvalidDerivation)?;
 
-        let tmp_replacement_str =
-            drv.calculate_drv_replacement_str(|drv| known_paths.get_replacement_string(drv));
+        // Calculate the derivation_or_fod_hash for the current derivation.
+        // This one is still intermediate (so not added to known_paths)
+        let derivation_or_fod_hash_tmp =
+            drv.derivation_or_fod_hash(|drv| known_paths.get_hash_derivation_modulo(drv));
 
-        drv.calculate_output_paths(&name, &tmp_replacement_str)
+        // Mutate the Derivation struct and set output paths
+        drv.calculate_output_paths(&name, &derivation_or_fod_hash_tmp)
             .map_err(Error::InvalidDerivation)?;
 
-        let actual_replacement_str =
-            drv.calculate_drv_replacement_str(|drv| known_paths.get_replacement_string(drv));
-
         let derivation_path = drv
             .calculate_derivation_path(&name)
             .map_err(Error::InvalidDerivation)?;
 
-        known_paths
-            .add_replacement_string(derivation_path.to_absolute_path(), &actual_replacement_str);
+        // recompute the hash derivation modulo and add to known_paths
+        let derivation_or_fod_hash_final =
+            drv.derivation_or_fod_hash(|drv| known_paths.get_hash_derivation_modulo(drv));
+
+        known_paths.add_hash_derivation_modulo(
+            derivation_path.to_absolute_path(),
+            &derivation_or_fod_hash_final,
+        );
 
         // mark all the new paths as known
         let output_names: Vec<String> = drv.outputs.keys().map(Clone::clone).collect();