os: build bootable images

hack/os/build.sh

@@ -0,0 +1,95 @@
+#!/bin/sh
+set -e
+
+REAL_SCRIPT="$(realpath "${0}")"
+cd "$(dirname "${REAL_SCRIPT}")/../.."
+
+./hack/dist/apk.sh
+KRATA_VERSION="$(./hack/dist/version.sh)"
+TARGET_ARCH="$(./hack/build/arch.sh)"
+
+TARGET_DIR="${PWD}/target"
+TARGET_OS_DIR="${TARGET_DIR}/os"
+mkdir -p "${TARGET_OS_DIR}"
+cp "${TARGET_DIR}/dist/krata_${KRATA_VERSION}_${TARGET_ARCH}.apk" "${TARGET_OS_DIR}/krata.apk"
+docker run --rm --privileged -v "${PWD}:/mnt" -it alpine:latest "/mnt/os/internal/stage1.sh"
+sudo chown "${USER}:${GROUP}" "${TARGET_OS_DIR}/rootfs.tgz"
+sudo modprobe nbd
+
+NBD_DEVICE="$(find /dev -maxdepth 2 -name 'nbd[0-9]*' | while read -r DEVICE
+do
+  if [ "$(sudo blockdev --getsize64 "${DEVICE}")" = "0" ]
+  then
+    echo "${DEVICE}"
+    break
+  fi
+done)"
+
+if [ -z "${NBD_DEVICE}" ]
+then
+  echo "ERROR: unable to allocate nbd device" > /dev/stderr
+  exit 1
+fi
+
+OS_IMAGE="${TARGET_OS_DIR}/krata.qcow2"
+EFI_PART="${NBD_DEVICE}p1"
+ROOT_PART="${NBD_DEVICE}p2"
+ROOT_DIR="${TARGET_OS_DIR}/root"
+EFI_DIR="${ROOT_DIR}/boot/efi"
+
+cleanup() {
+  trap '' EXIT HUP INT TERM
+  sudo umount -R "${ROOT_DIR}" > /dev/null 2>&1 || true
+  sudo umount "${EFI_PART}" > /dev/null 2>&1 || true
+  sudo umount "${ROOT_PART}" > /dev/null 2>&1 || true
+  sudo qemu-nbd --disconnect "${NBD_DEVICE}" > /dev/null 2>&1 || true
+  sudo rm -rf "${ROOT_DIR}"
+}
+
+rm -f "${OS_IMAGE}"
+qemu-img create -f qcow2 "${TARGET_OS_DIR}/krata.qcow2" "2G"
+
+trap cleanup EXIT HUP INT TERM
+sudo qemu-nbd --connect="${NBD_DEVICE}" --cache=writeback -f qcow2 "${OS_IMAGE}"
+printf '%s\n' \
+			 'label: gpt' \
+			 'name=efi,type=U,size=128M,bootable' \
+			 'name=system,type=L' | sudo sfdisk "${NBD_DEVICE}"
+sudo mkfs.fat -F32 -n EFI "${EFI_PART}"
+sudo mkfs.ext4 -L root -E discard "${ROOT_PART}"
+
+mkdir -p "${ROOT_DIR}"
+
+sudo mount -t ext4 "${ROOT_PART}" "${ROOT_DIR}"
+sudo mkdir -p "${EFI_DIR}"
+sudo mount -t vfat "${EFI_PART}" "${EFI_DIR}"
+
+sudo tar xf "${TARGET_OS_DIR}/rootfs.tar" -C "${ROOT_DIR}"
+ROOT_UUID="$(sudo blkid "${ROOT_PART}" | sed -En 's/.*\bUUID="([^"]+)".*/\1/p')"
+EFI_UUID="$(sudo blkid "${EFI_PART}" | sed -En 's/.*\bUUID="([^"]+)".*/\1/p')"
+echo "${ROOT_UUID}"
+
+sudo mkdir -p "${ROOT_DIR}/proc" "${ROOT_DIR}/dev" "${ROOT_DIR}/sys"
+sudo mount -t proc none "${ROOT_DIR}/proc"
+sudo mount --bind /dev "${ROOT_DIR}/dev"
+sudo mount --make-private "${ROOT_DIR}/dev"
+sudo mount --bind /sys "${ROOT_DIR}/sys"
+sudo mount --make-private "${ROOT_DIR}/sys"
+
+sudo cp "${PWD}/os/internal/stage2.sh" "${ROOT_DIR}/stage2.sh"
+echo "${ROOT_UUID}" | sudo tee "${ROOT_DIR}/root-uuid" > /dev/null
+sudo chroot "${ROOT_DIR}" /bin/sh -c "/stage2.sh"
+sudo rm -f "${ROOT_DIR}/stage2.sh"
+sudo rm -f "${ROOT_DIR}/root-uuid"
+
+{
+  echo "# krata fstab"
+  echo "UUID=${ROOT_UUID} / ext4 relatime 0 1"
+  echo "UUID=${EFI_UUID} / vfat rw,relatime,fmask=0133,codepage=437,iocharset=ascii,shortname=mixed,utf8,errors=remount-ro 0 2"
+} | sudo tee "${ROOT_DIR}/etc/fstab" > /dev/null
+
+cleanup
+
+OS_SMALL_IMAGE="${TARGET_OS_DIR}/krata.small.qcow2"
+qemu-img convert -O qcow2 "${OS_IMAGE}" "${OS_SMALL_IMAGE}"
+mv -f "${OS_SMALL_IMAGE}" "${OS_IMAGE}"