Move FAT image to a separate partition outside the ISO 9660 file system
Support bios.syslinux.eltorito boot mode without bios.syslinux.mbr. bios.syslinux.mbr does not work without bios.syslinux.eltorito because -isohybrid-mbr requires the El Torito boot image. Support uefi-x64.systemd-boot.esp boot mode without uefi-x64.systemd-boot.eltorito and vice versa. If uefi-x64.systemd-boot.eltorito is used without uefi-x64.systemd-boot.esp, the El Torito boot image will be placed in the ISO 9660 file system as before. Note that an ISO created with only uefi-x64.systemd-boot.eltorito will still be bootable as a "hard disk" on OVMF. OVMF will boot the El Torito image. This change has the following effect on the partition tables: - *.eltorito options add El Torito boot catalog entries. MBR and GPT are not affected. - uefi-x64.systemd-boot.esp creates a protective MBR partition table and a GPT table that includes a Linux filesystem data partition for the ISO 9660 volume, an EFI system partition and a Microsoft basic data partition that maps the 300 KiB padding added by xorriso. - bios.syslinux.mbr (without uefi-x64.systemd-boot.esp): adds a MBR partition table and maps the ISO 9660 volume as a partition of type 0x83. No GPT is produced. - bios.syslinux.mbr (with uefi-x64.systemd-boot.esp): adds an second partition in the MBR (after 0xEE) starting from sector 0 to sector 1 with type 0 and marks it as bootable. This violates the GPT specification, but allows some systems to succesfully boot in BIOS mode from GPT. Fixes https://gitlab.archlinux.org/archlinux/archiso/-/issues/49
This commit is contained in:
nl6720
parent
5f4260fcb1
commit
729d16b48c
1 changed files with 106 additions and 30 deletions
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@ -523,9 +523,9 @@ _make_efi() {
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_make_boot_on_fat() {
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local ucode_image all_ucode_images=()
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_msg_info "Preparing kernel and intramfs for the FAT file system..."
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mmd -i "${isofs_dir}/EFI/archiso/efiboot.img" \
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mmd -i "${work_dir}/efiboot.img" \
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"::/${install_dir}" "::/${install_dir}/boot" "::/${install_dir}/boot/${arch}"
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mcopy -i "${isofs_dir}/EFI/archiso/efiboot.img" "${airootfs_dir}/boot/vmlinuz-"* \
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mcopy -i "${work_dir}/efiboot.img" "${airootfs_dir}/boot/vmlinuz-"* \
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"${airootfs_dir}/boot/initramfs-"*".img" "::/${install_dir}/boot/${arch}/"
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for ucode_image in \
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"${airootfs_dir}/boot/"{intel-uc.img,intel-ucode.img,amd-uc.img,amd-ucode.img,early_ucode.cpio,microcode.cpio}
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@ -535,7 +535,7 @@ _make_boot_on_fat() {
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fi
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done
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if (( ${#all_ucode_images[@]} )); then
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mcopy -i "${isofs_dir}/EFI/archiso/efiboot.img" "${all_ucode_images[@]}" "::/${install_dir}/boot/"
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mcopy -i "${work_dir}/efiboot.img" "${all_ucode_images[@]}" "::/${install_dir}/boot/"
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fi
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_msg_info "Done!"
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}
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@ -544,7 +544,6 @@ _make_boot_on_fat() {
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_make_boot_uefi-x64.systemd-boot.esp() {
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local efiboot_imgsize="0"
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_msg_info "Setting up systemd-boot for UEFI booting..."
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install -d -m 0755 -- "${isofs_dir}/EFI/archiso"
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# the required image size in KiB (rounded up to the next full MiB with an additional MiB for reserved sectors)
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efiboot_imgsize="$(du -bc \
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@ -561,26 +560,26 @@ _make_boot_uefi-x64.systemd-boot.esp() {
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)"
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# The FAT image must be created with mkfs.fat not mformat, as some systems have issues with mformat made images:
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# https://lists.gnu.org/archive/html/grub-devel/2019-04/msg00099.html
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[[ -e "${isofs_dir}/EFI/archiso/efiboot.img" ]] && rm -f -- "${isofs_dir}/EFI/archiso/efiboot.img"
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[[ -e "${work_dir}/efiboot.img" ]] && rm -f -- "${work_dir}/efiboot.img"
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_msg_info "Creating FAT image of size: ${efiboot_imgsize} KiB..."
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mkfs.fat -C -n ARCHISO_EFI "${isofs_dir}/EFI/archiso/efiboot.img" "$efiboot_imgsize"
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mkfs.fat -C -n ARCHISO_EFI "${work_dir}/efiboot.img" "$efiboot_imgsize"
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mmd -i "${isofs_dir}/EFI/archiso/efiboot.img" ::/EFI ::/EFI/BOOT
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mcopy -i "${isofs_dir}/EFI/archiso/efiboot.img" \
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mmd -i "${work_dir}/efiboot.img" ::/EFI ::/EFI/BOOT
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mcopy -i "${work_dir}/efiboot.img" \
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"${airootfs_dir}/usr/lib/systemd/boot/efi/systemd-bootx64.efi" ::/EFI/BOOT/BOOTx64.EFI
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mmd -i "${isofs_dir}/EFI/archiso/efiboot.img" ::/loader ::/loader/entries
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mcopy -i "${isofs_dir}/EFI/archiso/efiboot.img" "${profile}/efiboot/loader/loader.conf" ::/loader/
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mmd -i "${work_dir}/efiboot.img" ::/loader ::/loader/entries
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mcopy -i "${work_dir}/efiboot.img" "${profile}/efiboot/loader/loader.conf" ::/loader/
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for _conf in "${profile}/efiboot/loader/entries/"*".conf"; do
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sed "s|%ARCHISO_LABEL%|${iso_label}|g;
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s|%INSTALL_DIR%|${install_dir}|g;
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s|%ARCH%|${arch}|g" \
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"${_conf}" | mcopy -i "${isofs_dir}/EFI/archiso/efiboot.img" - "::/loader/entries/${_conf##*/}"
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"${_conf}" | mcopy -i "${work_dir}/efiboot.img" - "::/loader/entries/${_conf##*/}"
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done
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# shellx64.efi is picked up automatically when on /
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if [[ -e "${airootfs_dir}/usr/share/edk2-shell/x64/Shell_Full.efi" ]]; then
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mcopy -i "${isofs_dir}/EFI/archiso/efiboot.img" \
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mcopy -i "${work_dir}/efiboot.img" \
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"${airootfs_dir}/usr/share/edk2-shell/x64/Shell_Full.efi" ::/shellx64.efi
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fi
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@ -619,29 +618,106 @@ _make_iso() {
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if [[ "${quiet}" == "y" ]]; then
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xorrisofs_options+=('-quiet')
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fi
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# xorrisofs options for x86 BIOS booting using SYSLINUX
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# shellcheck disable=SC2076
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if [[ " ${bootmodes[*]} " =~ ' bios.syslinux.' ]]; then
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if [[ ! -f "${isofs_dir}/isolinux/isolinux.bin" ]]; then
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_msg_error "The file '${isofs_dir}/isolinux/isolinux.bin' does not exist." 1
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# SYSLINUX El Torito
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if [[ " ${bootmodes[*]} " =~ ' bios.syslinux.eltorito ' ]]; then
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if [[ ! -f "${isofs_dir}/isolinux/isolinux.bin" ]]; then
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_msg_error "The file '${isofs_dir}/isolinux/isolinux.bin' does not exist." 1
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fi
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# SYSLINUX MBR
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if [[ " ${bootmodes[*]} " =~ ' bios.syslinux.mbr ' ]]; then
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if [[ ! -f "${isofs_dir}/isolinux/isohdpfx.bin" ]]; then
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_msg_error "The file '${isofs_dir}/isolinux/isohdpfx.bin' does not exist." 1
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fi
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xorrisofs_options+=(
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# SYSLINUX MBR bootstrap code; does not work without "-eltorito-boot isolinux/isolinux.bin"
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'-isohybrid-mbr' "${isofs_dir}/isolinux/isohdpfx.bin"
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# When GPT is used, create an additional partition in the MBR (besides 0xEE) for sectors 0–1 (MBR
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# bootstrap code area) and mark it as bootable
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# This violates the UEFI specification, but may allow booting on some systems
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# https://wiki.archlinux.org/index.php/Partitioning#Tricking_old_BIOS_into_booting_from_GPT
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'--mbr-force-bootable'
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# Set the ISO 9660 partition's type to "Linux filesystem data"
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# When only MBR is present, the partition type ID will be 0x83 "Linux" as xorriso translates all
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# GPT partition type GUIDs except for the ESP GUID to MBR type ID 0x83
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'-iso_mbr_part_type' '0FC63DAF-8483-4772-8E79-3D69D8477DE4'
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# Move the first partition away from the start of the ISO to match the expectations of partition
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# editors
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# May allow booting on some systems
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# https://dev.lovelyhq.com/libburnia/libisoburn/src/branch/master/doc/partition_offset.wiki
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'-partition_offset' '16'
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)
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fi
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xorrisofs_options+=(
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# El Torito boot image for x86 BIOS
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'-eltorito-boot' 'isolinux/isolinux.bin'
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# El Torito boot catalog file
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'-eltorito-catalog' 'isolinux/boot.cat'
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# Required options to boot with ISOLINUX
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'-no-emul-boot' '-boot-load-size' '4' '-boot-info-table'
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)
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else
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_msg_error "Using 'bios.syslinux.mbr' boot mode without 'bios.syslinux.eltorito' is not supported." 1
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fi
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if [[ ! -f "${isofs_dir}/isolinux/isohdpfx.bin" ]]; then
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_msg_error "The file '${isofs_dir}/isolinux/isohdpfx.bin' does not exist." 1
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fi
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xorrisofs_options+=(
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'-eltorito-boot' 'isolinux/isolinux.bin'
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'-eltorito-catalog' 'isolinux/boot.cat'
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'-no-emul-boot' '-boot-load-size' '4' '-boot-info-table'
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'-isohybrid-mbr' "${isofs_dir}/isolinux/isohdpfx.bin"
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)
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fi
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# xorrisofs options for X64 UEFI booting using systemd-boot
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# shellcheck disable=SC2076
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if [[ " ${bootmodes[*]} " =~ ' uefi-x64.systemd-boot.' ]]; then
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xorrisofs_options+=(
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'-eltorito-alt-boot'
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'-e' 'EFI/archiso/efiboot.img'
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'-no-emul-boot'
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'-isohybrid-gpt-basdat'
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)
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if [[ ! -f "${work_dir}/efiboot.img" ]]; then
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_msg_error "The file '${work_dir}/efiboot.img' does not exist." 1
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fi
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[[ -e "${isofs_dir}/EFI/archiso" ]] && rm -rf -- "${isofs_dir}/EFI/archiso"
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# systemd-boot in an attached EFI system partition
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if [[ " ${bootmodes[*]} " =~ ' uefi-x64.systemd-boot.esp ' ]]; then
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# Move the first partition away from the start of the ISO, otherwise the GPT will not be valid and ISO 9660
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# partition will not be mountable
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[[ " ${xorrisofs_options[*]} " =~ ' -partition_offset ' ]] || xorrisofs_options+=('-partition_offset' '16')
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xorrisofs_options+=(
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# Attach efiboot.img as a second partition and set its partition type to "EFI system partition"
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'-append_partition' '2' 'C12A7328-F81F-11D2-BA4B-00A0C93EC93B' "${work_dir}/efiboot.img"
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# Ensure GPT is used as some systems do not support UEFI booting without it
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'-appended_part_as_gpt'
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)
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# systemd-boot in an attached EFI system partition via El Torito
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if [[ " ${bootmodes[*]} " =~ ' uefi-x64.systemd-boot.eltorito ' ]]; then
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xorrisofs_options+=(
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# Start a new El Torito boot entry for UEFI
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'-eltorito-alt-boot'
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# Set the second partition as the El Torito UEFI boot image
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'-e' '--interval:appended_partition_2:all::'
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# Boot image is not emulating floppy or hard disk; required for all known boot loaders
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'-no-emul-boot'
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)
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fi
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# systemd-boot in an embedded efiboot.img via El Torito
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elif [[ " ${bootmodes[*]} " =~ ' uefi-x64.systemd-boot.eltorito ' ]]; then
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# The ISO will not contain a GPT partition table, so to be able to reference efiboot.img, place it as a
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# file inside the ISO 9660 file system
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install -d -m 0755 -- "${isofs_dir}/EFI/archiso"
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cp -a -- "${work_dir}/efiboot.img" "${isofs_dir}/EFI/archiso/efiboot.img"
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xorrisofs_options+=(
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# Start a new El Torito boot entry for UEFI
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'-eltorito-alt-boot'
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# Set efiboot.img as the El Torito UEFI boot image
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'-e' 'EFI/archiso/efiboot.img'
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# Boot image is not emulating floppy or hard disk; required for all known boot loaders
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'-no-emul-boot'
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)
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fi
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# Specify where to save the El Torito boot catalog file in case it is not already set by bios.syslinux.eltorito
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[[ " ${bootmodes[*]} " =~ ' bios.' ]] || xorrisofs_options+=('-eltorito-catalog' 'EFI/boot.cat')
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fi
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_msg_info "Creating ISO image..."
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@ -737,7 +813,7 @@ command_iso() {
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bootmodes=('bios.syslinux.mbr' 'bios.syslinux.eltorito')
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# If exists, add an EFI "El Torito" boot image (FAT filesystem) to ISO-9660 image.
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if [[ -f "${isofs_dir}/EFI/archiso/efiboot.img" ]]; then
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if [[ -f "${work_dir}/efiboot.img" ]]; then
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bootmodes+=('uefi-x64.systemd-boot.esp' 'uefi-x64.systemd-boot.eltorito')
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fi
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