First commit

.gitignore

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+tmp.*

build.sh

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+#!/bin/sh
+
+IMAGELENGTH=$(echo '2 * 1024 * 1024 * 1024' | bc)
+SDCARDDEVICE=/dev/mmcblk1
+
+TGT_HOSTNAME="preila"
+
+read -p "Username: " TGT_USERNAME
+read -p "Password: " TGT_PASSWORD
+
+IMAGEFILE=$(mktemp -p .)
+MOUNTDIR=mount-$(basename $IMAGEFILE)
+mkdir $MOUNTDIR
+
+PART_SECTOR_FIRST=34
+PART_SECTOR_FIRST_SIZE=32768 # 16MiB = (16 * 1024 * 1024) / 512
+PART_SECTOR_SECOND=$(echo $PART_SECTOR_FIRST + $PART_SECTOR_FIRST_SIZE + 1 | bc)
+PART_SECTOR_SECOND_END=4194270 # Given by gdisk on a 2GiB image file
+PART_SECTOR_SECOND_SIZE=$(echo $PART_SECTOR_SECOND_END - $PART_SECTOR_SECOND | bc)
+
+fallocate -l ${IMAGELENGTH} ${IMAGEFILE}
+
+echo "Partitionning the image file ..."
+/sbin/parted --script ${IMAGEFILE} mklabel gpt
+cgpt create ${IMAGEFILE}
+cgpt add -t kernel -l kernel -b ${PART_SECTOR_FIRST} -s ${PART_SECTOR_FIRST_SIZE} ${IMAGEFILE}
+cgpt add -t data -l / -b ${PART_SECTOR_SECOND} -s ${PART_SECTOR_SECOND_SIZE} ${IMAGEFILE}
+
+echo "Formatting the root partition ..."
+LOOPDEVICE=$(sudo losetup --partscan --show --find $IMAGEFILE)
+sudo mkfs.ext4 ${LOOPDEVICE}p2
+sudo mount ${LOOPDEVICE}p2 ${MOUNTDIR}
+
+echo "Bootstrapping a Debian install ..."
+sudo debootstrap \
+    --arch=armel \
+    --foreign stretch \
+    --include sudo cgpt vboot-utils vboot-kernel-utils \
+    $MOUNTDIR \
+    http://http.debian.net/debian
+
+sudo cp /usr/bin/qemu-arm-static ${MOUNTDIR}/usr/bin/
+
+echo ${TGT_HOSTNAME} | sudo tee ${MOUNTDIR}/etc/hostname >/dev/null
+
+echo "Completing the bootstrap process ..."
+sudo chroot ${MOUNTDIR} /debootstrap/debootstrap --second-stage
+sudo chroot ${MOUNTDIR} apt install sudo
+sudo chroot ${MOUNTDIR} passwd -l root
+sudo chroot ${MOUNTDIR} adduser ${TGT_USERNAME}
+sudo chroot ${MOUNTDIR} addgroup ${TGT_USERNAME} sudo
+
+sudo tee ${MOUNTDIR}/etc/fstab >/dev/null <<EOF
+${SDCARDDEVICE}p2 / ext4 errors=remount-ro 0 1
+EOF
+
+sudo umount ${MOUNTDIR}
+
+echo "Signing and copying the kernel ..."
+KERNELDIR=$(mktemp -d -p .)
+
+cat > ${KERNELDIR}/kernel.flags <<EOF
+console=tty1 printk.time=1 nosplash rootwait root=${SDCARDDEVICE}p2 ro rootfstype=ext4 lsm.module_locking=0
+EOF
+
+futility --debug vbutil_kernel \
+    --arch arm \
+    --version 1 \
+    --keyblock /usr/share/vboot/devkeys/kernel.keyblock \
+    --signprivate /usr/share/vboot/devkeys/kernel_data_key.vbprivk \
+    --bootloader ${KERNELDIR}/kernel.flags \
+    --config ${KERNELDIR}/kernel.flags \
+    --vmlinuz kernel_c201.itb \
+    --pack ${KERNELDIR}/kernel_c201.signed
+
+sudo dd if=${KERNELDIR}/kernel_c201.signed of=${LOOPDEVICE}p1 status=progress
+
+rm -r ${KERNELDIR}
+
+cgpt add -i 1 -P 15 -S 0 -T 1 ${IMAGEFILE}
+
+echo "Cleaning up ..."
+sudo losetup -d ${LOOPDEVICE}
+
+rmdir ${MOUNTDIR}