1these 5 derivations will be built:2 /nix/store/402bq96mdbxj8h0x57b93p560p3xvxhy-isolinux.cfg.drv3 /nix/store/i29yjq7jqbdp01j3iyh7dk8fazqsjjsy-efi-directory.drv4 /nix/store/xcj7wlz4n7535m4m1hswp4qpwn5p20yr-efi-image_eltorito.drv5 /nix/store/ykapn2fpw9lp11i02wcsqcds1kq4lxdf-closure-info.drv6 /nix/store/f3jm79lk08j377h4bkngi2aqrziw0cas-spaces-os.iso.drv7building '/nix/store/402bq96mdbxj8h0x57b93p560p3xvxhy-isolinux.cfg.drv'8building '/nix/store/ykapn2fpw9lp11i02wcsqcds1kq4lxdf-closure-info.drv'9building '/nix/store/i29yjq7jqbdp01j3iyh7dk8fazqsjjsy-efi-directory.drv'10closure-info> structuredAttrs is enabled11efi-directory> Building GRUB with modules:12efi-directory> - fat13efi-directory> - iso966014efi-directory> - part_gpt15efi-directory> - part_msdos16efi-directory> - normal17efi-directory> - boot18efi-directory> - linux19efi-directory> - configfile20efi-directory> - loopback21efi-directory> - chain22efi-directory> - halt23efi-directory> - efifwsetup24efi-directory> - efi_gop25efi-directory> - ls26efi-directory> - search27efi-directory> - search_label28efi-directory> - search_fs_uuid29efi-directory> - search_fs_file30efi-directory> - echo31efi-directory> - serial32efi-directory> - gfxmenu33efi-directory> - gfxterm34efi-directory> - gfxterm_background35efi-directory> - gfxterm_menu36efi-directory> - test37efi-directory> - loadenv38efi-directory> - all_video39efi-directory> - videoinfo40efi-directory> - png41efi-directory> Adding additional modules:42efi-directory> - efi_uga43efi-directory> '/nix/store/c6zqczb7nhr8754qqkpjchyvkxwnch71-refind-0.14.2/share/refind/refind_x64.efi' -> '/nix/store/b8qzckcjp1aw2f4yh30fqly1yhmzm0vm-efi-directory/EFI/BOOT/refind_x64.efi'44building '/nix/store/xcj7wlz4n7535m4m1hswp4qpwn5p20yr-efi-image_eltorito.drv'45efi-image_eltorito> Usage size: 209715246efi-image_eltorito> Image size: 314572847efi-image_eltorito> mkfs.fat 4.2 (2021-01-31)48efi-image_eltorito> Copying BOOTX64.EFI49efi-image_eltorito> Copying grub.cfg50efi-image_eltorito> Copying refind_x64.efi51efi-image_eltorito> fsck.fat 4.2 (2021-01-31)52efi-image_eltorito> Checking we can access the last sector of the filesystem53efi-image_eltorito> Boot sector contents:54efi-image_eltorito> System ID "mkfs.fat"55efi-image_eltorito> Media byte 0xf8 (hard disk)56efi-image_eltorito> 512 bytes per logical sector57efi-image_eltorito> 2048 bytes per cluster58efi-image_eltorito> 1 reserved sector59efi-image_eltorito> First FAT starts at byte 512 (sector 1)60efi-image_eltorito> 2 FATs, 12 bit entries61efi-image_eltorito> 2560 bytes per FAT (= 5 sectors)62efi-image_eltorito> Root directory starts at byte 5632 (sector 11)63efi-image_eltorito> 512 root directory entries64efi-image_eltorito> Data area starts at byte 22016 (sector 43)65efi-image_eltorito> 1525 data clusters (3123200 bytes)66efi-image_eltorito> 32 sectors/track, 2 heads67efi-image_eltorito> 0 hidden sectors68efi-image_eltorito> 6144 sectors total69efi-image_eltorito> Checking for unused clusters.70efi-image_eltorito> /nix/store/7w4y0r3vyh5jrchw81xrh4jsplrvyjap-efi-image_eltorito: 6 files, 719/1525 clusters71building '/nix/store/f3jm79lk08j377h4bkngi2aqrziw0cas-spaces-os.iso.drv'72spaces-os.iso> structuredAttrs is enabled73spaces-os.iso> Parallel mksquashfs: Using 32 processors74spaces-os.iso> Creating 4.0 filesystem on nix-store.squashfs, block size 1048576.