Add scripts to generate raw images

See: https://github.com/kairos-io/kairos/issues/377

tools-image/raw-images.sh

@@ -0,0 +1,71 @@
+#!/bin/bash
+# Generates EFI bootable images (statically)
+# This is a re-adaptation of https://github.com/rancher/elemental-toolkit/blob/v0.8.10-1/images/img-builder.sh, which was dropped
+# How to use:
+# First extract the image which you want to create an image from:
+### luet util unpack <image> rootfs
+# Then convert it to a raw disk (EFI only):
+### docker run -v $PWD:/output --entrypoint /raw-images.sh -ti --rm test-image /output/rootfs /output/foo.raw cloud-init.yaml
+
+: "${OEM_LABEL:=COS_OEM}"
+: "${RECOVERY_LABEL:=COS_RECOVERY}"
+
+DIRECTORY=$1
+OUT=${2:-disk.raw}
+CONFIG=$3
+
+echo "Output: $OUT"
+
+set -e
+
+mkdir -p /build/root/grub2
+mkdir /build/root/cOS
+mkdir /build/efi
+
+cp -rf /raw/grub/* /build/efi
+cp -rf /raw/grubconfig/* /build/root
+cp -rf /raw/grubartifacts/* /build/root/grub2
+
+echo "Generating squashfs from $DIRECTORY"
+mksquashfs $DIRECTORY recovery.squashfs -b 1024k -comp xz -Xbcj x86
+mv recovery.squashfs /build/root/cOS/recovery.squashfs
+
+# Create a 2GB filesystem for RECOVERY including the contents for root (grub config and squasfs container)
+truncate -s $((2048*1024*1024)) rootfs.part
+mkfs.ext2 -L "${RECOVERY_LABEL}" -d /build/root rootfs.part
+
+# Create the EFI partition FAT16 and include the EFI image and a basic grub.cfg
+truncate -s $((20*1024*1024)) efi.part
+
+mkfs.fat -F16 -n COS_GRUB efi.part
+mcopy -s -i efi.part /build/efi/EFI ::EFI
+
+# Create the grubenv forcing first boot to be on recovery system
+mkdir -p /build/oem
+cp /build/root/etc/cos/grubenv_firstboot /build/oem/grubenv
+if [ -n "$CONFIG" ]; then
+  echo "Copying config file ($CONFIG)"
+  cp $CONFIG /build/oem
+fi
+
+# Create a 64MB filesystem for OEM volume
+truncate -s $((64*1024*1024)) oem.part
+mkfs.ext2 -L "${OEM_LABEL}" -d /build/oem oem.part
+
+echo "Generating image $OUT"
+# Create disk image, add 3MB of initial free space to disk, 1MB is for proper alignement, 2MB are for the hybrid legacy boot.
+truncate -s $((3*1024*1024)) $OUT
+{
+    cat efi.part
+    cat oem.part
+    cat rootfs.part
+} >> $OUT
+
+# Add an extra MB at the end of the disk for the gpt headers, in fact 34 sectors would be enough, but adding some more does not hurt.
+truncate -s "+$((1024*1024))" $OUT
+
+# Create the partition table in $OUT (assumes sectors of 512 bytes)
+sgdisk -n 1:2048:+2M -c 1:legacy -t 1:EF02 $OUT
+sgdisk -n 2:0:+20M -c 2:UEFI -t 2:EF00 $OUT
+sgdisk -n 3:0:+64M -c 3:oem -t 3:8300 $OUT
+sgdisk -n 4:0:+2048M -c 4:root -t 4:8300 $OUT