anchor.diff:              mkdir disk
               mkfs -t ext3 -b 4096 /dev/${vmTools.hd}
               mount /dev/${vmTools.hd} disk
  -            cd disk
  +            mkdir -p disk/img
  +            cd disk/img
               mkdir proc sys dev
   
               # Run root script
  
positive.code:             cd ..
              mkdir -p /var/singularity/mnt/{container,final,overlay,session,source}
              echo "root:x:0:0:System administrator:/root:/bin/sh" > /etc/passwd
              singularity build $out ./disk
            '');
  
      in result;
  
negative.code:               done
              done
  
              # Create runScript and link shell
              ln -s ${runtimeShell} bin/sh
              mkdir -p .singularity.d
              ln -s ${runScriptFile} .singularity.d/runscript
  
              # Fill out .singularity.d
              mkdir -p .singularity.d/env
  