GNU xorriso 1.5.6.pl02 : RockRidge filesystem manipulator, libburnia project.

Drive current: -outdev 'stdio:/mirrors/slackware/slackware-current-iso/.building-slackware-mini-install.iso'
Media current: stdio file, overwriteable
Media status : is blank
Media summary: 0 sessions, 0 data blocks, 0 data,  465g free
xorriso : WARNING : -volid text does not comply to ISO 9660 / ECMA 119 rules
Added to ISO image: directory '/'='/mirrors/slackware/slackware-current'
xorriso : UPDATE :      57 files added in 1 seconds
xorriso : UPDATE :      57 files added in 1 seconds
xorriso : NOTE : Copying to System Area: 432 bytes from file '/usr/share/syslinux/isohdpfx.bin'
libisofs: WARNING : Cannot add /isolinux/sbootmgr/RAWRITE13.EXE to Joliet tree. Symlinks can only be added to a Rock Ridge tree.
libisofs: NOTE : Aligned image size to cylinder size by 352 blocks
libisofs: WARNING : Number of symbolic links omitted from Joliet tree: 1
xorriso : UPDATE :  2.70% done
xorriso : UPDATE :  77.02% done
ISO image produced: 50688 sectors
Written to medium : 50688 sectors at LBA 0
Writing to 'stdio:/mirrors/slackware/slackware-current-iso/.building-slackware-mini-install.iso' completed successfully.