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kumquat-buildroot/fs/iso9660/iso9660.mk
Kory Maincent 5916cc5011 fs/iso9660: add support for hybrid image using Grub2 on BIOS and EFI 
Add support for building an hybrid ISO9660 image compatible with legacy
and UEFI BIOS. Note that this is not about an (iso)hybrid image, which
can boot from both a CDROM or a USB stick, but really about an image
being bootable from the legay BIOS or EFI; the two are orthognal.

The option -eltorito-alt-boot need to be used in the xorriso command
to generate the hybrid image. That option is a separator, meaning the
previous boot entry is done, and the following boot options define a new
boot entry.

The -no-emul-boot defines the type of the current boot image; that's why
it has to now be repeated in each of the BIOS and EFI options.

Finally, for symetry and consistency between the BIOS and EFI options,
we move the BIOS image option first.

Note: the BIOS boot image options have to be provided before the EFI
ones, or the system won't boot; the underlying reason is not known...

Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
[yann.morin.1998@free.fr:
  - note about hybrid vs. (iso)hybrid
  - explain -eltorito-alt-boot
  - explain duplication of -no-emul-boot
  - rename the variables
  - note about the BIOS-EFI ordering
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
2021-09-29 22:58:57 +02:00

198 lines
6.8 KiB
Makefile
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################################################################################
#
# Build the iso96600 root filesystem image
#
################################################################################
#
# We need to handle three cases:
#
# 1. The ISO9660 filesystem will really be the real root filesystem
# itself. This is when BR2_TARGET_ROOTFS_ISO9660_INITRD is
# disabled.
#
# 2. The ISO9660 filesystem will be a filesystem with just a kernel
# image, initrd and grub. This is when
# BR2_TARGET_ROOTFS_ISO9660_INITRD is enabled, but
# BR2_TARGET_ROOTFS_INITRAMFS is disabled.
#
# 3. The ISO9660 filesystem will be a filesystem with just a kernel
# image and grub. This is like (2), except that the initrd is
# built into the kernel image. This is when
# BR2_TARGET_ROOTFS_INITRAMFS is enabled (regardless of the value
# of BR2_TARGET_ROOTFS_ISO9660_INITRD).
ROOTFS_ISO9660_BOOT_MENU = $(call qstrip,$(BR2_TARGET_ROOTFS_ISO9660_BOOT_MENU))
ROOTFS_ISO9660_DEPENDENCIES = host-xorriso linux
ifeq ($(BR2_TARGET_ROOTFS_INITRAMFS),y)
ROOTFS_ISO9660_USE_INITRD = YES
endif
ifeq ($(BR2_TARGET_ROOTFS_ISO9660_INITRD),y)
ROOTFS_ISO9660_USE_INITRD = YES
endif
ifeq ($(ROOTFS_ISO9660_USE_INITRD),YES)
ROOTFS_ISO9660_TMP_TARGET_DIR = $(FS_DIR)/rootfs.iso9660.tmp
define ROOTFS_ISO9660_CREATE_TEMPDIR
$(RM) -rf $(ROOTFS_ISO9660_TMP_TARGET_DIR)
mkdir -p $(ROOTFS_ISO9660_TMP_TARGET_DIR)
endef
ROOTFS_ISO9660_PRE_GEN_HOOKS += ROOTFS_ISO9660_CREATE_TEMPDIR
else ifeq ($(BR2_TARGET_ROOTFS_ISO9660_TRANSPARENT_COMPRESSION),y)
ROOTFS_ISO9660_DEPENDENCIES += host-zisofs-tools
ROOTFS_ISO9660_TMP_TARGET_DIR = $(FS_DIR)/rootfs.iso9660.tmp
# This must be early, before we copy the bootloader files.
define ROOTFS_ISO9660_MKZFTREE
$(RM) -rf $(ROOTFS_ISO9660_TMP_TARGET_DIR)
$(HOST_DIR)/bin/mkzftree -X -z 9 -p $(PARALLEL_JOBS) \
$(TARGET_DIR) \
$(ROOTFS_ISO9660_TMP_TARGET_DIR)
endef
ROOTFS_ISO9660_PRE_GEN_HOOKS += ROOTFS_ISO9660_MKZFTREE
ROOTFS_ISO9660_OPTS += -z
else
ROOTFS_ISO9660_TMP_TARGET_DIR = $(TARGET_DIR)
endif
ifeq ($(BR2_REPRODUCIBLE),y)
ROOTFS_ISO9660_VFAT_OPTS = --invariant
ROOTFS_ISO9660_FIX_TIME = touch -d @$(SOURCE_DATE_EPOCH)
else
ROOTFS_ISO9660_FIX_TIME = :
endif
ifeq ($(BR2_TARGET_ROOTFS_ISO9660_GRUB2)$(BR2_TARGET_ROOTFS_ISO9660_BIOS_BOOTLOADER),yy)
ROOTFS_ISO9660_DEPENDENCIES += grub2
ROOTFS_ISO9660_BOOTLOADER_CONFIG_PATH = \
$(ROOTFS_ISO9660_TMP_TARGET_DIR)/boot/grub/grub.cfg
ROOTFS_ISO9660_BOOT_IMAGE = boot/grub/grub-eltorito.img
define ROOTFS_ISO9660_INSTALL_BOOTLOADER_BIOS
$(INSTALL) -D -m 0644 $(BINARIES_DIR)/grub-eltorito.img \
$(ROOTFS_ISO9660_TMP_TARGET_DIR)/boot/grub/grub-eltorito.img
endef
endif
ifeq ($(BR2_TARGET_ROOTFS_ISO9660_GRUB2)$(BR2_TARGET_ROOTFS_ISO9660_EFI_BOOTLOADER),yy)
ROOTFS_ISO9660_DEPENDENCIES += grub2 host-dosfstools host-mtools
ROOTFS_ISO9660_EFI_PARTITION = boot/fat.efi
ROOTFS_ISO9660_EFI_PARTITION_PATH = $(ROOTFS_ISO9660_TMP_TARGET_DIR)/$(ROOTFS_ISO9660_EFI_PARTITION)
ROOTFS_ISO9660_EFI_PARTITION_CONTENT = $(BINARIES_DIR)/efi-part
ROOTFS_ISO9660_BOOTLOADER_CONFIG_PATH = \
$(ROOTFS_ISO9660_TMP_TARGET_DIR)/boot/grub/grub.cfg
define ROOTFS_ISO9660_INSTALL_BOOTLOADER_EFI
rm -rf $(ROOTFS_ISO9660_EFI_PARTITION_PATH)
mkdir -p $(dir $(ROOTFS_ISO9660_EFI_PARTITION_PATH))
dd if=/dev/zero of=$(ROOTFS_ISO9660_EFI_PARTITION_PATH) bs=1M count=1
$(HOST_DIR)/sbin/mkfs.vfat $(ROOTFS_ISO9660_VFAT_OPTS) $(ROOTFS_ISO9660_EFI_PARTITION_PATH)
$(ROOTFS_ISO9660_FIX_TIME) $(ROOTFS_ISO9660_EFI_PARTITION_CONTENT)/*
$(HOST_DIR)/bin/mcopy -p -m -i $(ROOTFS_ISO9660_EFI_PARTITION_PATH) -s \
$(ROOTFS_ISO9660_EFI_PARTITION_CONTENT)/* ::/
$(ROOTFS_ISO9660_FIX_TIME) $(ROOTFS_ISO9660_EFI_PARTITION_PATH)
endef
endif
ifeq ($(BR2_TARGET_ROOTFS_ISO9660_ISOLINUX),y)
ROOTFS_ISO9660_DEPENDENCIES += syslinux
ROOTFS_ISO9660_BOOTLOADER_CONFIG_PATH = \
$(ROOTFS_ISO9660_TMP_TARGET_DIR)/isolinux/isolinux.cfg
ROOTFS_ISO9660_BOOT_IMAGE = isolinux/isolinux.bin
define ROOTFS_ISO9660_INSTALL_BOOTLOADER_BIOS
$(INSTALL) -D -m 0644 $(BINARIES_DIR)/syslinux/* \
$(ROOTFS_ISO9660_TMP_TARGET_DIR)/isolinux/
$(INSTALL) -D -m 0644 $(HOST_DIR)/share/syslinux/ldlinux.c32 \
$(ROOTFS_ISO9660_TMP_TARGET_DIR)/isolinux/ldlinux.c32
endef
endif
define ROOTFS_ISO9660_PREPARATION
$(INSTALL) -D -m 0644 $(ROOTFS_ISO9660_BOOT_MENU) \
$(ROOTFS_ISO9660_BOOTLOADER_CONFIG_PATH)
$(SED) "s%__KERNEL_PATH__%/boot/$(LINUX_IMAGE_NAME)%" \
$(ROOTFS_ISO9660_BOOTLOADER_CONFIG_PATH)
$(ROOTFS_ISO9660_INSTALL_BOOTLOADER_BIOS)
$(ROOTFS_ISO9660_INSTALL_BOOTLOADER_EFI)
endef
ROOTFS_ISO9660_PRE_GEN_HOOKS += ROOTFS_ISO9660_PREPARATION
define ROOTFS_ISO9660_DISABLE_EXTERNAL_INITRD
$(SED) '/__INITRD_PATH__/d' $(ROOTFS_ISO9660_BOOTLOADER_CONFIG_PATH)
endef
# Copy the kernel to temporary filesystem
define ROOTFS_ISO9660_COPY_KERNEL
$(INSTALL) -D -m 0644 $(LINUX_IMAGE_PATH) \
$(ROOTFS_ISO9660_TMP_TARGET_DIR)/boot/$(LINUX_IMAGE_NAME)
endef
ifeq ($(ROOTFS_ISO9660_USE_INITRD),YES)
ROOTFS_ISO9660_PRE_GEN_HOOKS += ROOTFS_ISO9660_COPY_KERNEL
# If initramfs is used, disable loading the initrd as the rootfs is
# already inside the kernel image. Otherwise, make sure a cpio is
# generated and use it as the initrd.
ifeq ($(BR2_TARGET_ROOTFS_INITRAMFS),y)
ROOTFS_ISO9660_PRE_GEN_HOOKS += ROOTFS_ISO9660_DISABLE_EXTERNAL_INITRD
else
ROOTFS_ISO9660_DEPENDENCIES += rootfs-cpio
define ROOTFS_ISO9660_COPY_INITRD
$(INSTALL) -D -m 0644 $(BINARIES_DIR)/rootfs.cpio$(ROOTFS_CPIO_COMPRESS_EXT) \
$(ROOTFS_ISO9660_TMP_TARGET_DIR)/boot/initrd
$(SED) "s%__INITRD_PATH__%/boot/initrd%" \
$(ROOTFS_ISO9660_BOOTLOADER_CONFIG_PATH)
endef
ROOTFS_ISO9660_PRE_GEN_HOOKS += ROOTFS_ISO9660_COPY_INITRD
endif
else # ROOTFS_ISO9660_USE_INITRD
ifeq ($(BR2_TARGET_ROOTFS_ISO9660_TRANSPARENT_COMPRESSION),y)
# We must use the uncompressed kernel image
ROOTFS_ISO9660_PRE_GEN_HOOKS += ROOTFS_ISO9660_COPY_KERNEL
endif
ROOTFS_ISO9660_PRE_GEN_HOOKS += ROOTFS_ISO9660_DISABLE_EXTERNAL_INITRD
endif # ROOTFS_ISO9660_USE_INITRD
ROOTFS_ISO9660_OPTS += -J -R
ROOTFS_ISO9660_OPTS_BIOS = \
-b $(ROOTFS_ISO9660_BOOT_IMAGE) \
-no-emul-boot \
-boot-load-size 4 \
-boot-info-table
ROOTFS_ISO9660_OPTS_EFI = \
--efi-boot $(ROOTFS_ISO9660_EFI_PARTITION) \
-no-emul-boot
ifeq ($(BR2_TARGET_ROOTFS_ISO9660_BIOS_BOOTLOADER)$(BR2_TARGET_ROOTFS_ISO9660_EFI_BOOTLOADER),yy)
ROOTFS_ISO9660_OPTS += \
$(ROOTFS_ISO9660_OPTS_BIOS) \
-eltorito-alt-boot \
$(ROOTFS_ISO9660_OPTS_EFI)
else ifeq ($(BR2_TARGET_ROOTFS_ISO9660_BIOS_BOOTLOADER),y)
ROOTFS_ISO9660_OPTS += $(ROOTFS_ISO9660_OPTS_BIOS)
else ifeq ($(BR2_TARGET_ROOTFS_ISO9660_EFI_BOOTLOADER),y)
ROOTFS_ISO9660_OPTS += $(ROOTFS_ISO9660_OPTS_EFI)
endif
define ROOTFS_ISO9660_CMD
$(HOST_DIR)/bin/xorriso -as mkisofs \
$(ROOTFS_ISO9660_OPTS) \
-o $@ $(ROOTFS_ISO9660_TMP_TARGET_DIR)
endef
ifeq ($(BR2_TARGET_ROOTFS_ISO9660_HYBRID),y)
define ROOTFS_ISO9660_GEN_HYBRID
$(HOST_DIR)/bin/isohybrid -t 0x96 $@
endef
ROOTFS_ISO9660_POST_GEN_HOOKS += ROOTFS_ISO9660_GEN_HYBRID
endif
$(eval $(rootfs))
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