build_library: support uefi boot from iso

Author: Nick Owens

build_library/grub.cfg

@@ -57,23 +57,25 @@ if [ "$net_default_server" != "" ]; then
 fi
 
 # Search for the OEM partition, load additional configuration if found.
-if [ "$secure_boot" = "0" ]; then
+if [ "$secure_boot" = "0" -a -z "$isoboot" ]; then
    search --no-floppy --set oem --part-label OEM --hint "$root"
    if [ -n "$oem" -a -f "($oem)/grub.cfg" ]; then
        source "($oem)/grub.cfg"
    fi
 fi
 
 # Determine if this is a first boot.
-search --no-floppy --set first_boot \
-       --disk-uuid 00000000-0000-0000-0000-000000000001
-if [ -n "$first_boot" ]; then
-    # Note we explicitly request the disk-guid randomization, first_boot only triggers ignition.
-    set first_boot="coreos.first_boot=1 coreos.randomize_disk_guid=00000000-0000-0000-0000-000000000001"
-fi
-
-if [ -n "$oem_id" ]; then
-    set oem_id="coreos.oem.id=$oem_id"
+if [ -z "$isoboot" ]; then
+    search --no-floppy --set first_boot \
+           --disk-uuid 00000000-0000-0000-0000-000000000001
+    if [ -n "$first_boot" ]; then
+        # Note we explicitly request the disk-guid randomization, first_boot only triggers ignition.
+        set first_boot="coreos.first_boot=1 coreos.randomize_disk_guid=00000000-0000-0000-0000-000000000001"
+    fi
+    
+    if [ -n "$oem_id" ]; then
+        set oem_id="coreos.oem.id=$oem_id"
+    fi
 fi
 
 # If no specific console has been set by the OEM then select based on
@@ -107,19 +109,27 @@ fi
 # Assemble the options applicable to all the kernels below
 set linux_cmdline="rootflags=rw mount.usrflags=ro consoleblank=0 $linux_root $linux_console $first_boot $oem_id $linux_append"
 
-menuentry "CoreOS default" --id=coreos {
-    gptprio.next -d usr -u usr_uuid
-    if [ "$usr_uuid" = "7130c94a-213a-4e5a-8e26-6cce9662f132" ]; then
-       linux$suf /coreos/vmlinuz-a @@MOUNTUSR@@=PARTUUID=$usr_uuid $linux_cmdline
-    else
-       linux$suf /coreos/vmlinuz-b @@MOUNTUSR@@=PARTUUID=$usr_uuid $linux_cmdline
-    fi
-}
-
-menuentry "CoreOS USR-A" --id=coreos-a {
-   linux$suf /coreos/vmlinuz-a @@MOUNTUSR@@=PARTLABEL=USR-A $linux_cmdline
-}
+if [ -z "$isoboot" ]; then
+    menuentry "CoreOS default" --id=coreos {
+        gptprio.next -d usr -u usr_uuid
+        if [ "$usr_uuid" = "7130c94a-213a-4e5a-8e26-6cce9662f132" ]; then
+           linux$suf /coreos/vmlinuz-a @@MOUNTUSR@@=PARTUUID=$usr_uuid $linux_cmdline
+        else
+           linux$suf /coreos/vmlinuz-b @@MOUNTUSR@@=PARTUUID=$usr_uuid $linux_cmdline
+        fi
+    }
+    
+    menuentry "CoreOS USR-A" --id=coreos-a {
+       linux$suf /coreos/vmlinuz-a @@MOUNTUSR@@=PARTLABEL=USR-A $linux_cmdline
+    }
+    
+    menuentry "CoreOS USR-B" --id=coreos-b {
+       linux$suf /coreos/vmlinuz-b @@MOUNTUSR@@=PARTLABEL=USR-B $linux_cmdline
+    }
+else
+    menuentry "CoreOS default" --id=coreos {
+       linux$suf /coreos/vmlinuz coreos.autologin= $linux_console
+       initrd$suf /coreos/cpio.gz
+    }
+fi
 
-menuentry "CoreOS USR-B" --id=coreos-b {
-   linux$suf /coreos/vmlinuz-b @@MOUNTUSR@@=PARTLABEL=USR-B $linux_cmdline
-}

build_library/grub_install.sh

@@ -54,14 +54,14 @@ case "${FLAGS_target}" in
         CORE_NAME="core.img"
         ;;
     x86_64-efi)
-	CORE_MODULES+=( serial linuxefi efi_gop getenv smbios efinet verify http )
+	CORE_MODULES+=( serial linuxefi efi_gop getenv smbios efinet verify http iso9660 )
         CORE_NAME="core.efi"
         ;;
     x86_64-xen)
         CORE_NAME="core.elf"
         ;;
     arm64-efi)
-        CORE_MODULES+=( serial efi_gop getenv smbios efinet verify http )
+        CORE_MODULES+=( serial linux efi_gop getenv smbios efinet verify http iso9660 )
         CORE_NAME="core.efi"
         BOARD_GRUB=1
         ;;
@@ -140,6 +140,10 @@ info "Generating ${GRUB_DIR}/load.cfg"
 ESP_FSID=$(sudo grub-probe -t fs_uuid -d "${LOOP_DEV}p1")
 sudo_clobber "${ESP_DIR}/${GRUB_DIR}/load.cfg" <<EOF
 search.fs_uuid ${ESP_FSID} root \$root
+if [ "$root" = "(memdisk)" ]; then
+    set root="(hd0)"
+    set isoboot="1"
+fi
 set prefix=(memdisk)
 set
 EOF

build_library/vm_image_util.sh

@@ -570,16 +570,17 @@ _write_cpio_disk() {
 }
 
 _write_iso_disk() {
-    local base_dir="${VM_TMP_ROOT}/usr"
+    local base_dir="${VM_TMP_ROOT}"
     local iso_target="${VM_TMP_DIR}/rootiso"
+    local fat_target="${VM_TMP_DIR}/rootfat"
     local dst_dir=$(_dst_dir)
     local vmlinuz_name="$(_dst_name ".vmlinuz")"
 
     mkdir "${iso_target}"
     pushd "${iso_target}" >/dev/null
     mkdir isolinux syslinux coreos
     _write_cpio_common "$1" "${iso_target}/coreos/cpio.gz"
-    cp "${base_dir}"/boot/vmlinuz "${iso_target}/coreos/vmlinuz"
+    cp "${base_dir}/usr/boot/vmlinuz" "${iso_target}/coreos/vmlinuz"
     cp -R /usr/share/syslinux/* isolinux/
     cat<<EOF > isolinux/isolinux.cfg
 INCLUDE /syslinux/syslinux.cfg
@@ -594,9 +595,44 @@ label coreos
   kernel /coreos/vmlinuz
   append initrd=/coreos/cpio.gz coreos.autologin
 EOF
-    mkisofs -v -l -r -J -o $2 -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table .
-    isohybrid $2
+
+    # create fat image of grub for EFI
+    local grub_arch
+    local grub_name
+    case $BOARD in
+        amd64-usr)
+            grub_arch="x86_64-efi"
+            grub_name="bootx64.efi"
+            ;;
+        arm64-usr)
+            grub_arch="arm64-efi"
+            grub_name="bootaa64.efi"
+            ;;
+    esac
+
+    # 2880K floppy which fits our grub nicely.
+    dd if=/dev/zero of=isolinux/efi.img bs=512 count=5760 2>/dev/null
+    mformat -i isolinux/efi.img -v EFI -f 2880
+    mmd -i isolinux/efi.img efi
+    mmd -i isolinux/efi.img efi/boot
+    mcopy -i isolinux/efi.img -o "${base_dir}/boot/coreos/grub/${grub_arch}/core.efi" "::efi/boot/${grub_name}"
+
+    mkisofs -v -l -r -J -o $2 \
+        -eltorito-boot isolinux/isolinux.bin \
+        -eltorito-catalog isolinux/boot.cat \
+        -no-emul-boot \
+        -boot-load-size 4 \
+        -boot-info-table \
+        -eltorito-alt-boot \
+        -eltorito-platform efi \
+        -eltorito-boot isolinux/efi.img \
+        -no-emul-boot \
+        .
+
+    isohybrid --uefi $2
+
     popd >/dev/null
+
 }
 
 # If a config format is defined write it!