Merge pull request #27124 from robx/tmpdir

nix: short TMPDIR for tests on Darwin (fixes #27121)

pkgs/tools/package-management/nix/default.nix

···
 
     doInstallCheck = true;
 
+    # socket path becomes too long otherwise
+    preInstallCheck = lib.optional stdenv.isDarwin "export TMPDIR=/tmp";
+
     separateDebugInfo = stdenv.isLinux;
 
     crossAttrs = {