initrd
 trisquel
  iso-scan/filename
   /scripts/casper-premount/20iso_scan
 pureos
  20180120
   apt-cache show live-boot
   findiso
    /lib/live/boot/9990-cmdline-old
    /lib/live/boot/9990-misc-helpers.sh
  20180405 20200126
   apt-cache show casper