mirror of
https://github.com/linuxkit/linuxkit.git
synced 2025-07-19 09:16:29 +00:00
83 lines
2.5 KiB
Bash
Executable File
83 lines
2.5 KiB
Bash
Executable File
#!/bin/sh
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set -e
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# get the GRUB2 boot file name
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ARCH=${TARGETARCH:-`uname -m`}
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case $ARCH in
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x86_64)
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BOOTFILE=BOOTX64.EFI
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ROOTDEV=/dev/sr0
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;;
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aarch64)
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BOOTFILE=BOOTAA64.EFI
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ROOTDEV=/dev/vda
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;;
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esac
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mkdir -p /tmp/efi
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cd /tmp/efi
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# input is a tarball on stdin with kernel and cmdline in /boot
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# output is an iso on stdout
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# extract. BSD tar auto recognises compression, unlike GNU tar
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# only if stdin is a tty, if so need files volume mounted...
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[ -t 0 ] || bsdtar xzf -
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CMDLINE="$(cat boot/cmdline)"
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# if no root= root device specified, assume /dev/{sr0, vda} ie first CD drive
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# need to detect the root device automatically in the future
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echo "${CMDLINE}" | grep -q 'root=' || CMDLINE="${CMDLINE} root=${ROOTDEV}"
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rm boot/cmdline
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cp /usr/local/share/$BOOTFILE .
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CFG="set timeout=0
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set gfxpayload=text
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menuentry 'LinuxKit ISO Image' {
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linux /boot/kernel ${CMDLINE} text
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}
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"
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mkdir -p EFI/BOOT
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printf "$CFG" > EFI/BOOT/grub.cfg
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# create a ISO with a EFI boot partition
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# Stuff it into a FAT filesystem, making it as small as possible. 511KiB
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# headroom seems to be enough; (x+31)/32*32 rounds up to multiple of 32.
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mkfs.vfat -v -C boot.img \
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$(( ($(stat -c %s "${BOOTFILE}") / 1024 + 511) \
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/ 32 * 32 )) > /dev/null
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echo "mtools_skip_check=1" >> /etc/mtools.conf && \
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mmd -i boot.img ::/EFI
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mmd -i boot.img ::/EFI/BOOT
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mcopy -i boot.img $BOOTFILE ::/EFI/BOOT/
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rm $BOOTFILE
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xorriso -as mkisofs \
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-R -e boot.img -hide boot.img -hide boot.catalog -no-emul-boot -o linuxkit-efi.iso .
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cat linuxkit-efi.iso
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# How to build a VHDX. Commented out because we are currently not using it
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# Don't delete: It took too long to figure out how to do this...
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# # create a disk image (150MB)
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# # This is a little odd, as we run this as part of the default command.
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# # Can't run this during the build step as it requires privilege.
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# # The Magic numbers in losetup are startsector (2048) times 512 and
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# # (endsector - startsector) * 512
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# CMD cd /tmp/efi && \
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# dd if=/dev/zero of=disk.raw bs=1024 count=51200 && \
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# sgdisk -N 1 -t 1:ef00 disk.raw && \
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# losetup -o 1048576 --sizelimit 51362816 /dev/loop/1 disk.raw && \
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# mkfs.vfat /dev/loop/1 && \
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# echo "drive c: file=\"/dev/loop/1\" mtools_skip_check=1" > /etc/mtools.conf && \
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# mmd c:/EFI && \
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# mmd c:/EFI/BOOT && \
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# mcopy linuxkit.efi c:/EFI/BOOT/BOOTX64.EFI && \
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# losetup -d /dev/loop/1 && \
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# qemu-img convert -O vhdx disk.raw linuxkit-boot.vhdx && \
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# cp /tmp/efi/linuxkit.efi /tmp/efi/linuxkitefi.iso /tmp/efi/linuxkit-boot.vhdx /mnt/
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