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72 lines
2.4 KiB
Bash
72 lines
2.4 KiB
Bash
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#!/bin/bash
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# Generates EFI bootable images (statically)
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# This is a re-adaptation of https://github.com/rancher/elemental-toolkit/blob/v0.8.10-1/images/img-builder.sh, which was dropped
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# How to use:
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# First extract the image which you want to create an image from:
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### luet util unpack <image> rootfs
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# Then convert it to a raw disk (EFI only):
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### docker run -v $PWD:/output --entrypoint /raw-images.sh -ti --rm test-image /output/rootfs /output/foo.raw cloud-init.yaml
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: "${OEM_LABEL:=COS_OEM}"
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: "${RECOVERY_LABEL:=COS_RECOVERY}"
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DIRECTORY=$1
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OUT=${2:-disk.raw}
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CONFIG=$3
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echo "Output: $OUT"
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set -e
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mkdir -p /build/root/grub2
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mkdir /build/root/cOS
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mkdir /build/efi
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cp -rf /raw/grub/* /build/efi
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cp -rf /raw/grubconfig/* /build/root
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cp -rf /raw/grubartifacts/* /build/root/grub2
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echo "Generating squashfs from $DIRECTORY"
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mksquashfs $DIRECTORY recovery.squashfs -b 1024k -comp xz -Xbcj x86
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mv recovery.squashfs /build/root/cOS/recovery.squashfs
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# Create a 2GB filesystem for RECOVERY including the contents for root (grub config and squasfs container)
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truncate -s $((2048*1024*1024)) rootfs.part
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mkfs.ext2 -L "${RECOVERY_LABEL}" -d /build/root rootfs.part
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# Create the EFI partition FAT16 and include the EFI image and a basic grub.cfg
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truncate -s $((20*1024*1024)) efi.part
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mkfs.fat -F16 -n COS_GRUB efi.part
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mcopy -s -i efi.part /build/efi/EFI ::EFI
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# Create the grubenv forcing first boot to be on recovery system
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mkdir -p /build/oem
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cp /build/root/etc/cos/grubenv_firstboot /build/oem/grubenv
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if [ -n "$CONFIG" ]; then
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echo "Copying config file ($CONFIG)"
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cp $CONFIG /build/oem
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fi
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# Create a 64MB filesystem for OEM volume
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truncate -s $((64*1024*1024)) oem.part
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mkfs.ext2 -L "${OEM_LABEL}" -d /build/oem oem.part
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echo "Generating image $OUT"
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# Create disk image, add 3MB of initial free space to disk, 1MB is for proper alignement, 2MB are for the hybrid legacy boot.
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truncate -s $((3*1024*1024)) $OUT
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{
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cat efi.part
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cat oem.part
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cat rootfs.part
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} >> $OUT
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# Add an extra MB at the end of the disk for the gpt headers, in fact 34 sectors would be enough, but adding some more does not hurt.
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truncate -s "+$((1024*1024))" $OUT
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# Create the partition table in $OUT (assumes sectors of 512 bytes)
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sgdisk -n 1:2048:+2M -c 1:legacy -t 1:EF02 $OUT
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sgdisk -n 2:0:+20M -c 2:UEFI -t 2:EF00 $OUT
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sgdisk -n 3:0:+64M -c 3:oem -t 3:8300 $OUT
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sgdisk -n 4:0:+2048M -c 4:root -t 4:8300 $OUT
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