1these 5 derivations will be built:2 /nix/store/4lzcpqvg5bz25iik2imdbfcznp74l5q0-isolinux.cfg.drv3 /nix/store/ysngi2fl7jskyfxx6idpmypk8il640zx-efi-directory.drv4 /nix/store/824lwwssf8h83rxav0mxras0a3agq2b1-efi-image_eltorito.drv5 /nix/store/pp6dmkzhr2d567ribqax9151q2p8ds31-closure-info.drv6 /nix/store/j4b7z01shp52hfzj1nbgbv5fkvkfqdl3-spaces-os.iso.drv7building '/nix/store/4lzcpqvg5bz25iik2imdbfcznp74l5q0-isolinux.cfg.drv'8building '/nix/store/pp6dmkzhr2d567ribqax9151q2p8ds31-closure-info.drv'9building '/nix/store/ysngi2fl7jskyfxx6idpmypk8il640zx-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/mj0krghks99ralwi7sw4b4gksnz3szn0-efi-directory/EFI/BOOT/refind_x64.efi'44building '/nix/store/824lwwssf8h83rxav0mxras0a3agq2b1-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/602yljnxdhry37xb1rsdc4d6zw4fw1y7-efi-image_eltorito: 6 files, 719/1525 clusters71building '/nix/store/j4b7z01shp52hfzj1nbgbv5fkvkfqdl3-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 1048576.75spaces-os.iso> 76spaces-os.iso> 77spaces-os.iso> Exportable Squashfs 4.0 filesystem, zstd compressed, data block size 104857678spaces-os.iso> compressed data, compressed metadata, compressed fragments,79spaces-os.iso> compressed xattrs, compressed ids80spaces-os.iso> duplicates are removed81spaces-os.iso> Filesystem size 9032965.05 Kbytes (8821.25 Mbytes)82spaces-os.iso> 44.66% of uncompressed filesystem size (20228153.41 Kbytes)83spaces-os.iso> Inode table size 5917963 bytes (5779.26 Kbytes)84spaces-os.iso> 22.23% of uncompressed inode table size (26624842 bytes)85spaces-os.iso> Directory table size 6779983 bytes (6621.08 Kbytes)86spaces-os.iso> 35.46% of uncompressed directory table size (19117483 bytes)87spaces-os.iso> Number of duplicate files found 10622288spaces-os.iso> Number of inodes 68246189spaces-os.iso> Number of files 44848190spaces-os.iso> Number of fragments 553791spaces-os.iso> Number of symbolic links 8696892spaces-os.iso> Number of device nodes 093spaces-os.iso> Number of fifo nodes 094spaces-os.iso> Number of socket nodes 095spaces-os.iso> Number of directories 14701296spaces-os.iso> Number of hard-links 097spaces-os.iso> Number of ids (unique uids + gids) 198spaces-os.iso> Number of uids 199spaces-os.iso> root (0)100spaces-os.iso> Number of gids 1101spaces-os.iso> root (0)102spaces-os.iso> xorriso 1.5.8.pl02 : RockRidge filesystem manipulator, libburnia project.103spaces-os.iso> 104spaces-os.iso> xorriso : NOTE : Environment variable SOURCE_DATE_EPOCH encountered with value 315532800105spaces-os.iso> Drive current: -outdev 'stdio:/nix/store/rb7b77d1ywl3fbs9bckz83ml9zwb0jbc-spaces-os.iso/iso/spaces-os.iso'106spaces-os.iso> Media current: stdio file, overwriteable107spaces-os.iso> Media status : is blank108spaces-os.iso> Media summary: 0 sessions, 0 data blocks, 0 data, 1107g free109spaces-os.iso> xorriso : UPDATE : 194 files added in 1 seconds110spaces-os.iso> Added 12 items from file 'pathlist'111spaces-os.iso> xorriso : UPDATE : 194 files added in 1 seconds112spaces-os.iso> xorriso : NOTE : Copying to System Area: 432 bytes from file '/nix/store/02ggy47qb66jdq894c5b9in1r5f4y0wr-syslinux-unstable-2019-02-07/share/syslinux/isohdpfx.bin'113spaces-os.iso> libisofs: NOTE : Automatically adjusted MBR geometry to 1133/255/63114spaces-os.iso> libisofs: WARNING : Image size exceeds 1024 cylinders. Cannot align partition.115spaces-os.iso> libisofs: WARNING : There are said to be BIOSes which will not boot this via MBR.116spaces-os.iso> xorriso : UPDATE : 0.62% done117spaces-os.iso> xorriso : UPDATE : 5.78% done118spaces-os.iso> xorriso : UPDATE : 11.01% done, estimate finish Wed Aug 12 08:46:44 2026119spaces-os.iso> xorriso : UPDATE : 16.37% done, estimate finish Wed Aug 12 08:46:43 2026120spaces-os.iso> xorriso : UPDATE : 22.37% done, estimate finish Wed Aug 12 08:46:43 2026121spaces-os.iso> xorriso : UPDATE : 27.95% done, estimate finish Wed Aug 12 08:46:43 2026122spaces-os.iso> xorriso : UPDATE : 33.12% done, estimate finish Wed Aug 12 08:46:43 2026123spaces-os.iso> xorriso : UPDATE : 38.14% done, estimate finish Wed Aug 12 08:46:44 2026124spaces-os.iso> xorriso : UPDATE : 43.46% done, estimate finish Wed Aug 12 08:46:44 2026125spaces-os.iso> xorriso : UPDATE : 48.56% done, estimate finish Wed Aug 12 08:46:44 2026126spaces-os.iso> xorriso : UPDATE : 54.11% done, estimate finish Wed Aug 12 08:46:44 2026127spaces-os.iso> xorriso : UPDATE : 58.98% done, estimate finish Wed Aug 12 08:46:44 2026128spaces-os.iso> xorriso : UPDATE : 64.33% done, estimate finish Wed Aug 12 08:46:44 2026129spaces-os.iso> xorriso : UPDATE : 69.24% done, estimate finish Wed Aug 12 08:46:43 2026130spaces-os.iso> xorriso : UPDATE : 73.50% done, estimate finish Wed Aug 12 08:46:44 2026131spaces-os.iso> xorriso : UPDATE : 78.35% done, estimate finish Wed Aug 12 08:46:44 2026132spaces-os.iso> xorriso : UPDATE : 82.20% done, estimate finish Wed Aug 12 08:46:44 2026