Revert "devShellTools.unstructuredDerivationInputEnv: Match passAsFile basename"

This reverts commit 1cf3103bca.

The commit implemented a "nice to have" TODO, which ultimately causes
hash differences between Lix and Nix. We can't conditionally use the
`convertHash` builtin, because we don't have an alternative to produce
the same results.

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

@@ -1,6 +1,6 @@
 {
   lib,
-  writeTextFile,
+  writeText,
 }:
 let
   inherit (builtins) typeOf;
@@ -36,24 +36,7 @@ rec {
           str = valueToString value;
         in
         if lib.elem name (drvAttrs.passAsFile or [ ]) then
-          let
-            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" "${
-            writeTextFile {
-              name = "shell-passAsFile-${name}";
-              text = str;
-              destination = "/${basename}";
-            }
-          }/${basename}"
+          lib.nameValuePair "${name}Path" "${writeText "shell-passAsFile-${name}" str}"
         else
           lib.nameValuePair name str
       )

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

@@ -170,10 +170,6 @@ lib.recurseIntoAttrs {
             set -x
 
             diff $exampleBarPathString $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."}