anchor.diff:            Extra build steps that is run as the last part of the build phase
             for the <code>output</code> build.
           '';
  +      };
  +
  +      tailFiles = mkOption {
  +        type = with types; attrsOf str;
  +        default = {
  +          OUT = "script.stdout";
  +          ERR = "script.stderr";
  +        } // genAttrs instNames (n: "hosts/${n}/console.log")
  +          // genAttrs instNames (n: "hosts/${n}/journal.log");
         };
   
         test-driver = {
  
positive.code:   instList = concatMapStringsSep "," (n: ''"${n}"'') instNames;
  
    padName = n:
      if any (n': stringLength n' > stringLength n) instNames
      then padName "${n} " else n;
  
    virshCmds = concatStringsSep ";" (flatten [
  
negative.code: let
  
    cfg = config.libvirt.test;
  
    inherit (import ../lib.nix) hexByteToInt mkMAC;
  
  