gistfile1.txt

     default = {
          type = "app";
          program = with args.unstable.legacyPackages.x86_64-linux;
            (writeShellApplication {
              name = "hash-me.sh";
              runtimeInputs = [coreutils];
              text = ''
                self=$(echo ${self.outPath} | cut -d/ -f4)
                rev=${builtins.toString (self.revCount or 0)}
                lastMod=${builtins.toString (self.lastModified or 0)}
                echo "$self" >&2
                hash=$(printf "%s;%s;%d;%d;%s" "$self" "" "$rev" "$lastMod" "$(cat ${self.outPath}/flake.lock)" | sha256sum | cut -d' ' -f1)
                printf "$HOME/.cache/nix/eval-cache-v2/%s.sqlite\n" "$hash"
              '';
            })
            + "/bin/hash-me.sh";
        };