feat: boot.img.lz4

scripts/grub_install.sh

@@ -0,0 +1,131 @@
+#!/bin/bash
+
+set -e
+
+disk_image="${1}"
+LOOP_DEV="${2}"
+ESP_DIR="${3}"
+
+# i386-pc or x86_64-efi
+target=${4:-x86_64-efi}
+
+export PATH="/opt/grub/bin:/opt/grub/sbin:$PATH"
+
+info() {
+    echo "INFO:" "$@"
+}
+
+warn() {
+    echo "WARN:" "$@"
+}
+
+cleanup() {
+    if [[ -n "${GRUB_TEMP_DIR}" && -e "${GRUB_TEMP_DIR}" ]]; then
+      rm -r "${GRUB_TEMP_DIR}"
+    fi
+}
+trap cleanup EXIT
+
+info "Installing GRUB in ${disk_image##*/}"
+
+mkdir -p "${ESP_DIR}/grub"
+GRUB_TEMP_DIR="$(mktemp -d)"
+
+devmap="${GRUB_TEMP_DIR}/device.map"
+
+cat >${devmap} <<EOF
+(hd0)   ${LOOP_DEV}
+EOF
+
+mkdir -p "${ESP_DIR}/grub"
+sed -e "s/{{.FSID}}/$ESP_FSID/g" "/assets/grub.cfg" > "${ESP_DIR}/grub/grub.cfg"
+
+info "Generating grub/load.cfg"
+# Include a small initial config in the core image to search for the ESP
+# by filesystem ID in case the platform doesn't provide the boot disk.
+# The existing $root value is given as a hint so it is searched first.
+ESP_FSID=$(grub-probe --device-map=$devmap -t fs_uuid -d "${LOOP_DEV}p1")
+cat > "${ESP_DIR}/grub/load.cfg" <<EOF
+search.fs_uuid ${ESP_FSID} root \$root
+set prefix=(memdisk)
+set
+EOF
+
+# Generate a memdisk containing the appropriately generated grub.cfg. Doing
+# this because we need conflicting default behaviors between verity and
+# non-verity images.
+info "Generating grub.cfg memdisk"
+
+sed -e "s/{{.FSID}}/$ESP_FSID/g" "/assets/grub.cfg" > "${GRUB_TEMP_DIR}/grub.cfg"
+
+mkdir -p "${ESP_DIR}/grub"
+tar cf "${ESP_DIR}/grub/grub.cfg.tar" \
+ -C "${GRUB_TEMP_DIR}" "grub.cfg"
+
+for target in i386-pc x86_64-efi
+do
+    GRUB_SRC="/usr/lib/grub/${target}"
+    GRUB_DIR="grub/${target}"
+
+    [[ -d "${GRUB_SRC}" ]] || die "GRUB not installed at ${GRUB_SRC}"
+
+    info "Compressing modules in ${GRUB_DIR}"
+    mkdir -p "${ESP_DIR}/${GRUB_DIR}"
+    for file in "${GRUB_SRC}"/*{.lst,.mod}; do
+        out="${ESP_DIR}/${GRUB_DIR}/${file##*/}"
+        gzip --best --stdout "${file}" | cat > "${out}"
+    done
+
+    # Modules required to boot a standard configuration
+    CORE_MODULES=( normal search test fat part_gpt search_fs_uuid gzio terminal configfile memdisk tar echo read )
+    #CORE_MODULES+=( search_part_label gptprio )
+
+    # Name of the core image, depends on target
+    CORE_NAME=
+
+    case "${target}" in
+        i386-pc)
+            CORE_MODULES+=( biosdisk serial linux )
+            CORE_NAME="core.img"
+            ;;
+        x86_64-efi)
+            CORE_MODULES+=( serial linuxefi efi_gop efinet verify http tftp )
+            #CORE_MODULES+=( getenv smbios )
+            CORE_NAME="core.efi"
+            ;;
+        *)
+            die_notrace "Unknown GRUB target ${target}"
+            ;;
+    esac
+
+    info "Generating grub/${CORE_NAME}"
+    grub-mkimage \
+        --compression=auto \
+        --format "${target}" \
+        --directory "${GRUB_SRC}" \
+        --config "${ESP_DIR}/grub/load.cfg" \
+        --memdisk "${ESP_DIR}/grub/grub.cfg.tar" \
+        --output "${ESP_DIR}/${GRUB_DIR}/${CORE_NAME}" \
+        "${CORE_MODULES[@]}"
+done
+
+# Now target specific steps to make the system bootable
+info "Installing MBR and the BIOS Boot partition."
+cp "/usr/lib/grub/i386-pc/boot.img" "${ESP_DIR}/grub/i386-pc"
+grub-bios-setup --device-map=$devmap \
+    --directory="${ESP_DIR}/grub/i386-pc" "${LOOP_DEV}"
+
+# backup the MBR
+dd bs=448 count=1 status=none if="${LOOP_DEV}" \
+    of="${ESP_DIR}/grub/mbr.bin"
+
+info "Installing default x86_64 UEFI bootloader."
+mkdir -p "${ESP_DIR}/EFI/boot"
+
+cp "${ESP_DIR}/grub/x86_64-efi/core.efi" \
+    "${ESP_DIR}/EFI/boot/grubx64.efi"
+cp "/shim/BOOTX64.EFI" \
+    "${ESP_DIR}/EFI/boot/bootx64.efi"
+
+cleanup
+trap - EXIT