2 files changed, 11 insertions, 13 deletions

diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index eaf04320e..969391725 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -991,8 +991,8 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
     bool contentAddressed = false;
     bool isImpure = false;
     std::optional<std::string> outputHash;
-    std::string outputHashAlgo;
-    auto ingestionMethod = FileIngestionMethod::Flat;
+    std::optional<std::string> outputHashAlgo;
+    std::optional<FileIngestionMethod> ingestionMethod;
 
     StringSet outputs;
     outputs.insert("out");
@@ -1190,15 +1190,16 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
                 .errPos = posDrvName
             });
 
-        std::optional<HashType> ht = parseHashTypeOpt(outputHashAlgo);
+        std::optional<HashType> ht = parseHashTypeOpt(outputHashAlgo.value_or("sha256"));
         Hash h = newHashAllowEmpty(*outputHash, ht);
 
-        auto outPath = state.store->makeFixedOutputPath(ingestionMethod, h, drvName);
+        auto method = ingestionMethod.value_or(FileIngestionMethod::Flat);
+        auto outPath = state.store->makeFixedOutputPath(method, h, drvName);
         drv.env["out"] = state.store->printStorePath(outPath);
         drv.outputs.insert_or_assign("out",
             DerivationOutput::CAFixed {
                 .hash = FixedOutputHash {
-                    .method = ingestionMethod,
+                    .method = method,
                     .hash = std::move(h),
                 },
             });
@@ -1211,19 +1212,21 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
                 .errPos = posDrvName
             });
 
-        HashType ht = parseHashType(outputHashAlgo);
+        auto ht = parseHashType(outputHashAlgo.value_or("sha256"));
+        auto method = ingestionMethod.value_or(FileIngestionMethod::Recursive);
+
         for (auto & i : outputs) {
             drv.env[i] = hashPlaceholder(i);
             if (isImpure)
                 drv.outputs.insert_or_assign(i,
                     DerivationOutput::Impure {
-                        .method = ingestionMethod,
+                        .method = method,
                         .hashType = ht,
                     });
             else
                 drv.outputs.insert_or_assign(i,
                     DerivationOutput::CAFloating {
-                        .method = ingestionMethod,
+                        .method = method,
                         .hashType = ht,
                     });
         }
diff --git a/tests/impure-derivations.nix b/tests/impure-derivations.nix
index 2fed56fe7..98547e6c1 100644
--- a/tests/impure-derivations.nix
+++ b/tests/impure-derivations.nix
@@ -15,8 +15,6 @@ rec {
         printf $((x + 1)) > $TEST_ROOT/counter
       '';
     __impure = true;
-    outputHashAlgo = "sha256";
-    outputHashMode = "recursive";
     impureEnvVars = [ "TEST_ROOT" ];
   };
 
@@ -32,8 +30,6 @@ rec {
         ln -s $out $out/self
       '';
     __impure = true;
-    outputHashAlgo = "sha256";
-    outputHashMode = "recursive";
   };
 
   # This is not allowed.
@@ -53,7 +49,6 @@ rec {
         x=$(< ${impureOnImpure}/n)
         printf ''${x:0:1} > $out
       '';
-    outputHashAlgo = "sha256";
     outputHashMode = "recursive";
     outputHash = "sha256-eBYxcgkuWuiqs4cKNgKwkb3vY/HR0vVsJnqe8itJGcQ=";
   };