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# image-vm.bbclass
# (loosly based off image-live.bbclass Copyright (C) 2004, Advanced Micro Devices, Inc.)
#
# Create an image which can be placed directly onto a harddisk using dd and then
# booted.
#
# This uses syslinux. extlinux would have been nice but required the ext2/3
# partition to be mounted. grub requires to run itself as part of the install
# process.
#
# The end result is a 512 boot sector populated with an MBR and partition table
# followed by an msdos fat16 partition containing syslinux and a linux kernel
# completed by the ext2/3 rootfs.
#
# We have to push the msdos parition table size > 16MB so fat 16 is used as parted
# won't touch fat12 partitions.
inherit live-vm-common
do_bootdirectdisk[depends] += "dosfstools-native:do_populate_sysroot \
virtual/kernel:do_deploy \
syslinux:do_populate_sysroot \
syslinux-native:do_populate_sysroot \
parted-native:do_populate_sysroot \
mtools-native:do_populate_sysroot \
${PN}:do_image_${VM_ROOTFS_TYPE} \
"
IMAGE_TYPEDEP_vmdk = "${VM_ROOTFS_TYPE}"
IMAGE_TYPEDEP_vdi = "${VM_ROOTFS_TYPE}"
IMAGE_TYPEDEP_qcow2 = "${VM_ROOTFS_TYPE}"
IMAGE_TYPEDEP_hdddirect = "${VM_ROOTFS_TYPE}"
IMAGE_TYPES_MASKED += "vmdk vdi qcow2 hdddirect"
VM_ROOTFS_TYPE ?= "ext4"
ROOTFS ?= "${DEPLOY_DIR_IMAGE}/${IMAGE_LINK_NAME}.${VM_ROOTFS_TYPE}"
# Used by bootloader
LABELS_VM ?= "boot"
ROOT_VM ?= "root=/dev/sda2"
# Using an initramfs is optional. Enable it by setting INITRD_IMAGE_VM.
INITRD_IMAGE_VM ?= ""
INITRD_VM ?= "${@'${DEPLOY_DIR_IMAGE}/${INITRD_IMAGE_VM}-${MACHINE}.cpio.gz' if '${INITRD_IMAGE_VM}' else ''}"
do_bootdirectdisk[depends] += "${@'${INITRD_IMAGE_VM}:do_image_complete' if '${INITRD_IMAGE_VM}' else ''}"
BOOTDD_VOLUME_ID ?= "boot"
BOOTDD_EXTRA_SPACE ?= "16384"
DISK_SIGNATURE ?= "${DISK_SIGNATURE_GENERATED}"
DISK_SIGNATURE[vardepsexclude] = "DISK_SIGNATURE_GENERATED"
build_boot_dd() {
HDDDIR="${S}/hdd/boot"
HDDIMG="${S}/hdd.image"
IMAGE=${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.hdddirect
populate_kernel $HDDDIR
if [ "${PCBIOS}" = "1" ]; then
syslinux_hddimg_populate $HDDDIR
fi
if [ "${EFI}" = "1" ]; then
efi_hddimg_populate $HDDDIR
fi
BLOCKS=`du -bks $HDDDIR | cut -f 1`
BLOCKS=`expr $BLOCKS + ${BOOTDD_EXTRA_SPACE}`
# Ensure total sectors is an integral number of sectors per
# track or mcopy will complain. Sectors are 512 bytes, and we
# generate images with 32 sectors per track. This calculation is
# done in blocks, thus the mod by 16 instead of 32.
BLOCKS=$(expr $BLOCKS + $(expr 16 - $(expr $BLOCKS % 16)))
# Remove it since mkdosfs would fail when it exists
rm -f $HDDIMG
mkdosfs -n ${BOOTDD_VOLUME_ID} -S 512 -C $HDDIMG $BLOCKS
mcopy -i $HDDIMG -s $HDDDIR/* ::/
if [ "${PCBIOS}" = "1" ]; then
syslinux_hdddirect_install $HDDIMG
fi
chmod 644 $HDDIMG
ROOTFSBLOCKS=`du -Lbks ${ROOTFS} | cut -f 1`
TOTALSIZE=`expr $BLOCKS + $ROOTFSBLOCKS`
END1=`expr $BLOCKS \* 1024`
END2=`expr $END1 + 512`
END3=`expr \( $ROOTFSBLOCKS \* 1024 \) + $END1`
echo $ROOTFSBLOCKS $TOTALSIZE $END1 $END2 $END3
rm -rf $IMAGE
dd if=/dev/zero of=$IMAGE bs=1024 seek=$TOTALSIZE count=1
parted $IMAGE mklabel msdos
parted $IMAGE mkpart primary fat16 0 ${END1}B
parted $IMAGE unit B mkpart primary ext2 ${END2}B ${END3}B
parted $IMAGE set 1 boot on
parted $IMAGE print
awk "BEGIN { printf \"$(echo ${DISK_SIGNATURE} | fold -w 2 | tac | paste -sd '' | sed 's/\(..\)/\\x&/g')\" }" | \
dd of=$IMAGE bs=1 seek=440 conv=notrunc
OFFSET=`expr $END2 / 512`
if [ "${PCBIOS}" = "1" ]; then
dd if=${STAGING_DATADIR}/syslinux/mbr.bin of=$IMAGE conv=notrunc
fi
dd if=$HDDIMG of=$IMAGE conv=notrunc seek=1 bs=512
dd if=${ROOTFS} of=$IMAGE conv=notrunc seek=$OFFSET bs=512
cd ${DEPLOY_DIR_IMAGE}
rm -f ${DEPLOY_DIR_IMAGE}/${IMAGE_LINK_NAME}.hdddirect
ln -s ${IMAGE_NAME}.hdddirect ${DEPLOY_DIR_IMAGE}/${IMAGE_LINK_NAME}.hdddirect
}
python do_bootdirectdisk() {
validate_disk_signature(d)
set_live_vm_vars(d, 'VM')
if d.getVar("PCBIOS", True) == "1":
bb.build.exec_func('build_syslinux_cfg', d)
if d.getVar("EFI", True) == "1":
bb.build.exec_func('build_efi_cfg', d)
bb.build.exec_func('build_boot_dd', d)
}
def generate_disk_signature():
import uuid
signature = str(uuid.uuid4())[:8]
if signature != '00000000':
return signature
else:
return 'ffffffff'
def validate_disk_signature(d):
import re
disk_signature = d.getVar("DISK_SIGNATURE", True)
if not re.match(r'^[0-9a-fA-F]{8}$', disk_signature):
bb.fatal("DISK_SIGNATURE '%s' must be an 8 digit hex string" % disk_signature)
DISK_SIGNATURE_GENERATED := "${@generate_disk_signature()}"
run_qemu_img (){
type="$1"
qemu-img convert -O $type ${DEPLOY_DIR_IMAGE}/${IMAGE_LINK_NAME}.hdddirect ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.$type
ln -sf ${IMAGE_NAME}.$type ${DEPLOY_DIR_IMAGE}/${IMAGE_LINK_NAME}.$type
}
create_vmdk_image () {
run_qemu_img vmdk
}
create_vdi_image () {
run_qemu_img vdi
}
create_qcow2_image () {
run_qemu_img qcow2
}
python do_vmimg() {
if 'vmdk' in d.getVar('IMAGE_FSTYPES', True):
bb.build.exec_func('create_vmdk_image', d)
if 'vdi' in d.getVar('IMAGE_FSTYPES', True):
bb.build.exec_func('create_vdi_image', d)
if 'qcow2' in d.getVar('IMAGE_FSTYPES', True):
bb.build.exec_func('create_qcow2_image', d)
}
addtask bootdirectdisk before do_vmimg
addtask vmimg after do_bootdirectdisk before do_image_complete
do_vmimg[depends] += "qemu-native:do_populate_sysroot"
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