pkg.yaml

name: kernel
variant: scratch
shell: /toolchain/bin/bash
dependencies:
    - image: '{{ .TOOLS_IMAGE }}'
steps:
    - sources:
          - url: https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.5.15.tar.xz
            destination: linux.tar.xz
            sha256: c41fd8052e3e53de5bf0a0d666f92b7a9ea2d5f09b24423ee8c090f1e77ce214
            sha512: fc774cee6c2eb87cf3efdb6a71f4b22e82536e7d62d32b8ee28f8001f31e1a2c3029ddd95884a69284685f02f928d3d3eb37b506568fa32d6192b12c9d45adde
      prepare:
          - |
              tar -xJf linux.tar.xz --strip-components=1

              mkdir /bin
              ln -sv /toolchain/bin/bash /bin/bash
              ln -sv /toolchain/bin/bash /bin/sh
              ln -sv /toolchain/lib /lib
              mkdir -p /usr/bin \
                  && ln -sf /toolchain/bin/env /usr/bin/env \
                  && ln -sf /toolchain/bin/true /bin/true \
                  && ln -sf /toolchain/bin/pwd /bin/pwd

              # Ensure that `make menuconfig` works.

              mkdir -p /usr/lib/pkgconfig
              ln -s /toolchain/include /usr/include

              for lib in ncurses form panel menu ; do
                  rm -vf                    /lib/lib${lib}.so
                  echo "INPUT(-l${lib}w)" > /lib/lib${lib}.so
                  ln -sfv ${lib}w.pc        /lib/pkgconfig/${lib}.pc
              done

              case $ARCH in
                  x86_64)
                      make mrproper
                      cp -v /pkg/config-amd64 .config
                  ;;
                  aarch64)
                      export ARCH=arm64
                      make mrproper
                      cp -v /pkg/config-arm64 .config
                  ;;
                  *)
                      echo "unsupported arch ${ARCH}"
                      exit 1
                  ;;
              esac
      build:
          - |
              case $ARCH in
                  x86_64)
                  ;;
                  aarch64)
                      export ARCH=arm64
                  ;;
                  *)
                      echo "unsupported arch ${ARCH}"
                      exit 1
                  ;;
              esac
              make -j $(nproc)
              make -j $(nproc) modules
      install:
          - |
              mkdir -p /rootfs/boot
              case $ARCH in
                  x86_64)
                      mv arch/x86/boot/bzImage /rootfs/boot/vmlinuz
                      mv vmlinux /rootfs/boot/vmlinux
                  ;;
                  aarch64)
                      export ARCH=arm64
                      mv arch/arm64/boot/Image.gz /rootfs/boot/vmlinuz
                      mv vmlinux /rootfs/boot/vmlinux
                  ;;
                  *)
                      echo "unsupported arch ${ARCH}"
                      exit 1
                  ;;
              esac
              export KERNELRELEASE=$(cat include/config/kernel.release)
              make -j $(nproc) modules_install DEPMOD=/toolchain/bin/depmod INSTALL_MOD_PATH=/rootfs
              depmod -b /rootfs $KERNELRELEASE
              unlink /rootfs/lib/modules/$KERNELRELEASE/build
              unlink /rootfs/lib/modules/$KERNELRELEASE/source
finalize:
    - from: /rootfs
      to: /