these 5 derivations will be built: /nix/store/4lzcpqvg5bz25iik2imdbfcznp74l5q0-isolinux.cfg.drv /nix/store/ysngi2fl7jskyfxx6idpmypk8il640zx-efi-directory.drv /nix/store/824lwwssf8h83rxav0mxras0a3agq2b1-efi-image_eltorito.drv /nix/store/pp6dmkzhr2d567ribqax9151q2p8ds31-closure-info.drv /nix/store/j4b7z01shp52hfzj1nbgbv5fkvkfqdl3-spaces-os.iso.drv building '/nix/store/4lzcpqvg5bz25iik2imdbfcznp74l5q0-isolinux.cfg.drv' building '/nix/store/pp6dmkzhr2d567ribqax9151q2p8ds31-closure-info.drv' building '/nix/store/ysngi2fl7jskyfxx6idpmypk8il640zx-efi-directory.drv' closure-info> structuredAttrs is enabled efi-directory> Building GRUB with modules: efi-directory> - fat efi-directory> - iso9660 efi-directory> - part_gpt efi-directory> - part_msdos efi-directory> - normal efi-directory> - boot efi-directory> - linux efi-directory> - configfile efi-directory> - loopback efi-directory> - chain efi-directory> - halt efi-directory> - efifwsetup efi-directory> - efi_gop efi-directory> - ls efi-directory> - search efi-directory> - search_label efi-directory> - search_fs_uuid efi-directory> - search_fs_file efi-directory> - echo efi-directory> - serial efi-directory> - gfxmenu efi-directory> - gfxterm efi-directory> - gfxterm_background efi-directory> - gfxterm_menu efi-directory> - test efi-directory> - loadenv efi-directory> - all_video efi-directory> - videoinfo efi-directory> - png efi-directory> Adding additional modules: efi-directory> - efi_uga efi-directory> '/nix/store/c6zqczb7nhr8754qqkpjchyvkxwnch71-refind-0.14.2/share/refind/refind_x64.efi' -> '/nix/store/mj0krghks99ralwi7sw4b4gksnz3szn0-efi-directory/EFI/BOOT/refind_x64.efi' building '/nix/store/824lwwssf8h83rxav0mxras0a3agq2b1-efi-image_eltorito.drv' efi-image_eltorito> Usage size: 2097152 efi-image_eltorito> Image size: 3145728 efi-image_eltorito> mkfs.fat 4.2 (2021-01-31) efi-image_eltorito> Copying BOOTX64.EFI efi-image_eltorito> Copying grub.cfg efi-image_eltorito> Copying refind_x64.efi efi-image_eltorito> fsck.fat 4.2 (2021-01-31) efi-image_eltorito> Checking we can access the last sector of the filesystem efi-image_eltorito> Boot sector contents: efi-image_eltorito> System ID "mkfs.fat" efi-image_eltorito> Media byte 0xf8 (hard disk) efi-image_eltorito> 512 bytes per logical sector efi-image_eltorito> 2048 bytes per cluster efi-image_eltorito> 1 reserved sector efi-image_eltorito> First FAT starts at byte 512 (sector 1) efi-image_eltorito> 2 FATs, 12 bit entries efi-image_eltorito> 2560 bytes per FAT (= 5 sectors) efi-image_eltorito> Root directory starts at byte 5632 (sector 11) efi-image_eltorito> 512 root directory entries efi-image_eltorito> Data area starts at byte 22016 (sector 43) efi-image_eltorito> 1525 data clusters (3123200 bytes) efi-image_eltorito> 32 sectors/track, 2 heads efi-image_eltorito> 0 hidden sectors efi-image_eltorito> 6144 sectors total efi-image_eltorito> Checking for unused clusters. efi-image_eltorito> /nix/store/602yljnxdhry37xb1rsdc4d6zw4fw1y7-efi-image_eltorito: 6 files, 719/1525 clusters building '/nix/store/j4b7z01shp52hfzj1nbgbv5fkvkfqdl3-spaces-os.iso.drv' spaces-os.iso> structuredAttrs is enabled spaces-os.iso> Parallel mksquashfs: Using 32 processors spaces-os.iso> Creating 4.0 filesystem on nix-store.squashfs, block size 1048576. spaces-os.iso> spaces-os.iso> spaces-os.iso> Exportable Squashfs 4.0 filesystem, zstd compressed, data block size 1048576 spaces-os.iso> compressed data, compressed metadata, compressed fragments, spaces-os.iso> compressed xattrs, compressed ids spaces-os.iso> duplicates are removed spaces-os.iso> Filesystem size 9032965.05 Kbytes (8821.25 Mbytes) spaces-os.iso> 44.66% of uncompressed filesystem size (20228153.41 Kbytes) spaces-os.iso> Inode table size 5917963 bytes (5779.26 Kbytes) spaces-os.iso> 22.23% of uncompressed inode table size (26624842 bytes) spaces-os.iso> Directory table size 6779983 bytes (6621.08 Kbytes) spaces-os.iso> 35.46% of uncompressed directory table size (19117483 bytes) spaces-os.iso> Number of duplicate files found 106222 spaces-os.iso> Number of inodes 682461 spaces-os.iso> Number of files 448481 spaces-os.iso> Number of fragments 5537 spaces-os.iso> Number of symbolic links 86968 spaces-os.iso> Number of device nodes 0 spaces-os.iso> Number of fifo nodes 0 spaces-os.iso> Number of socket nodes 0 spaces-os.iso> Number of directories 147012 spaces-os.iso> Number of hard-links 0 spaces-os.iso> Number of ids (unique uids + gids) 1 spaces-os.iso> Number of uids 1 spaces-os.iso> root (0) spaces-os.iso> Number of gids 1 spaces-os.iso> root (0) spaces-os.iso> xorriso 1.5.8.pl02 : RockRidge filesystem manipulator, libburnia project. spaces-os.iso> spaces-os.iso> xorriso : NOTE : Environment variable SOURCE_DATE_EPOCH encountered with value 315532800 spaces-os.iso> Drive current: -outdev 'stdio:/nix/store/rb7b77d1ywl3fbs9bckz83ml9zwb0jbc-spaces-os.iso/iso/spaces-os.iso' spaces-os.iso> Media current: stdio file, overwriteable spaces-os.iso> Media status : is blank spaces-os.iso> Media summary: 0 sessions, 0 data blocks, 0 data, 1107g free spaces-os.iso> xorriso : UPDATE : 194 files added in 1 seconds spaces-os.iso> Added 12 items from file 'pathlist' spaces-os.iso> xorriso : UPDATE : 194 files added in 1 seconds spaces-os.iso> xorriso : NOTE : Copying to System Area: 432 bytes from file '/nix/store/02ggy47qb66jdq894c5b9in1r5f4y0wr-syslinux-unstable-2019-02-07/share/syslinux/isohdpfx.bin' spaces-os.iso> libisofs: NOTE : Automatically adjusted MBR geometry to 1133/255/63 spaces-os.iso> libisofs: WARNING : Image size exceeds 1024 cylinders. Cannot align partition. spaces-os.iso> libisofs: WARNING : There are said to be BIOSes which will not boot this via MBR. spaces-os.iso> xorriso : UPDATE : 0.62% done spaces-os.iso> xorriso : UPDATE : 5.78% done spaces-os.iso> xorriso : UPDATE : 11.01% done, estimate finish Wed Aug 12 08:46:44 2026 spaces-os.iso> xorriso : UPDATE : 16.37% done, estimate finish Wed Aug 12 08:46:43 2026 spaces-os.iso> xorriso : UPDATE : 22.37% done, estimate finish Wed Aug 12 08:46:43 2026 spaces-os.iso> xorriso : UPDATE : 27.95% done, estimate finish Wed Aug 12 08:46:43 2026 spaces-os.iso> xorriso : UPDATE : 33.12% done, estimate finish Wed Aug 12 08:46:43 2026 spaces-os.iso> xorriso : UPDATE : 38.14% done, estimate finish Wed Aug 12 08:46:44 2026 spaces-os.iso> xorriso : UPDATE : 43.46% done, estimate finish Wed Aug 12 08:46:44 2026 spaces-os.iso> xorriso : UPDATE : 48.56% done, estimate finish Wed Aug 12 08:46:44 2026 spaces-os.iso> xorriso : UPDATE : 54.11% done, estimate finish Wed Aug 12 08:46:44 2026 spaces-os.iso> xorriso : UPDATE : 58.98% done, estimate finish Wed Aug 12 08:46:44 2026 spaces-os.iso> xorriso : UPDATE : 64.33% done, estimate finish Wed Aug 12 08:46:44 2026 spaces-os.iso> xorriso : UPDATE : 69.24% done, estimate finish Wed Aug 12 08:46:43 2026 spaces-os.iso> xorriso : UPDATE : 73.50% done, estimate finish Wed Aug 12 08:46:44 2026 spaces-os.iso> xorriso : UPDATE : 78.35% done, estimate finish Wed Aug 12 08:46:44 2026 spaces-os.iso> xorriso : UPDATE : 82.20% done, estimate finish Wed Aug 12 08:46:44 2026