devShellTools.unstructuredDerivationInputEnv: Support older Nix

pkgs/build-support/dev-shell-tools/default.nix

@@ -31,10 +31,14 @@ rec {
         in if lib.elem name (drvAttrs.passAsFile or [])
         then
           let
-            nameHash = builtins.convertHash {
-              hash = "sha256:" + builtins.hashString "sha256" name;
-              toHashFormat = "nix32";
-            };
+            nameHash =
+              if builtins?convertHash
+              then builtins.convertHash {
+                hash = "sha256:" + builtins.hashString "sha256" name;
+                toHashFormat = "nix32";
+              }
+              else
+                builtins.hashString "sha256" name;
             basename = ".attr-${nameHash}";
           in
             lib.nameValuePair "${name}Path" "${

pkgs/build-support/dev-shell-tools/tests/default.nix

@@ -149,7 +149,9 @@ lib.recurseIntoAttrs {
 
           diff $exampleBarPathString $barPath
 
-          [[ "$(basename $exampleBarPathString)" = "$(basename $barPath)" ]]
+          ${lib.optionalString (builtins?convertHash) ''
+            [[ "$(basename $exampleBarPathString)" = "$(basename $barPath)" ]]
+          ''}
         )
 
         ''${args:+fail "args should not be set by Nix. We don't expect it to and unstructuredDerivationInputEnv removes it."}