wic: Add plugin for hybrid iso image

This plugin creates a hybrid, legacy and EFI bootable ISO image.
The generated image can be used on optical media as well as
USB media.

Legacy boot uses syslinux and EFI boot uses grub or gummiboot (not
implemented yet) as bootloader. The plugin creates the directories
required by bootloaders and populates them by creating and
configuring the bootloader files.

The plugin adds an image file to the iso which
contains the directory tree of the rootfs folder specified by the
--rootfs argument or by the IMAGE_ROOTFS bitbake variable.

Using the isohybryd tool, the created .iso image is enhanced by a MBR
for booting from disk storage devices, consequently the provided
iso image could be copyed directly by dd comand onto USB drive or
could be burned to an optical media by using a suitable image burner.

The plugin depends on parted, e2fstools, syslinux, grub, cdrtools,
dosfstools and mtools program.

Some of the functions in this plugin were inspired from bootimg-efi.py
and bootimg-pcbios.py plugins implemented by Tom Zanussi.

(From OE-Core rev: 289c534b5d990e22e5547496f5f84cc9721ce3ee)

Signed-off-by: Mihaly Varga <mihaly.varga@ni.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 538 insertions, 0 deletions

diff --git a/scripts/lib/wic/plugins/source/isoimage-isohybrid.py b/scripts/lib/wic/plugins/source/isoimage-isohybrid.py
new file mode 100644
index 0000000000..1cee90637a
--- /dev/null
+++ b/scripts/lib/wic/plugins/source/isoimage-isohybrid.py
@@ -0,0 +1,538 @@
+# ex:ts=4:sw=4:sts=4:et
+# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+#
+# DESCRIPTION
+# This implements the 'isoimage-isohybrid' source plugin class for 'wic'
+#
+# AUTHORS
+# Mihaly Varga <mihaly.varga (at] ni.com>
+
+import os
+import re
+import shutil
+
+from wic import kickstart, msger
+from wic.pluginbase import SourcePlugin
+from wic.utils.oe.misc import exec_cmd, exec_native_cmd, get_bitbake_var
+
+class IsoImagePlugin(SourcePlugin):
+    """
+    Create a bootable ISO image
+
+    This plugin creates a hybrid, legacy and EFI bootable ISO image. The
+    generated image can be used on optical media as well as USB media.
+
+    Legacy boot uses syslinux and EFI boot uses grub or gummiboot (not
+    implemented yet) as bootloader. The plugin creates the directories required
+    by bootloaders and populates them by creating and configuring the
+    bootloader files.
+
+    Example kickstart file:
+    part /boot --source isoimage-isohybrid --sourceparams="loader=grub-efi, \\
+    image_name= IsoImage" --ondisk cd --label LIVECD --fstype=ext2
+    bootloader  --timeout=10  --append=" "
+
+    In --sourceparams "loader" specifies the bootloader used for booting in EFI
+    mode, while "image_name" specifies the name of the generated image. In the
+    example above, wic creates an ISO image named IsoImage-cd.direct (default
+    extension added by direct imeger plugin) and a file named IsoImage-cd.iso
+    """
+
+    name = 'isoimage-isohybrid'
+
+    @classmethod
+    def do_configure_syslinux(cls, cr, cr_workdir):
+        """
+        Create loader-specific (syslinux) config
+        """
+        splash = os.path.join(cr_workdir, "/ISO/boot/splash.jpg")
+        if os.path.exists(splash):
+            splashline = "menu background splash.jpg"
+        else:
+            splashline = ""
+
+        options = cr.ks.handler.bootloader.appendLine
+
+        timeout = kickstart.get_timeout(cr.ks, 10)
+
+        syslinux_conf = ""
+        syslinux_conf += "PROMPT 0\n"
+        syslinux_conf += "TIMEOUT %s \n" % timeout
+        syslinux_conf += "\n"
+        syslinux_conf += "ALLOWOPTIONS 1\n"
+        syslinux_conf += "SERIAL 0 115200\n"
+        syslinux_conf += "\n"
+        if splashline:
+            syslinux_conf += "%s\n" % splashline
+        syslinux_conf += "DEFAULT boot\n"
+        syslinux_conf += "LABEL boot\n"
+
+        kernel = "/bzImage"
+        syslinux_conf += "KERNEL " + kernel + "\n"
+        syslinux_conf += "APPEND initrd=/initrd LABEL=boot %s\n" % options
+
+        msger.debug("Writing syslinux config %s/ISO/isolinux/isolinux.cfg" \
+                    % cr_workdir)
+        with open("%s/ISO/isolinux/isolinux.cfg" % cr_workdir, "w") as cfg:
+            cfg.write(syslinux_conf)
+
+    @classmethod
+    def do_configure_grubefi(cls, part, cr, cr_workdir):
+        """
+        Create loader-specific (grub-efi) config
+        """
+        splash = os.path.join(cr_workdir, "/EFI/boot/splash.jpg")
+        if os.path.exists(splash):
+            splashline = "menu background splash.jpg"
+        else:
+            splashline = ""
+
+        options = cr.ks.handler.bootloader.appendLine
+
+        grubefi_conf = ""
+        grubefi_conf += "serial --unit=0 --speed=115200 --word=8 "
+        grubefi_conf += "--parity=no --stop=1\n"
+        grubefi_conf += "default=boot\n"
+        timeout = kickstart.get_timeout(cr.ks, 10)
+        grubefi_conf += "timeout=%s\n" % timeout
+        grubefi_conf += "\n"
+        grubefi_conf += "search --set=root --label %s " % part.label
+        grubefi_conf += "\n"
+        grubefi_conf += "menuentry 'boot'{\n"
+
+        kernel = "/bzImage"
+
+        grubefi_conf += "linux %s rootwait %s\n" \
+            % (kernel, options)
+        grubefi_conf += "initrd /initrd \n"
+        grubefi_conf += "}\n"
+
+        if splashline:
+            grubefi_conf += "%s\n" % splashline
+
+        msger.debug("Writing grubefi config %s/EFI/BOOT/grub.cfg" \
+                        % cr_workdir)
+        with open("%s/EFI/BOOT/grub.cfg" % cr_workdir, "w") as cfg:
+            cfg.write(grubefi_conf)
+
+    @staticmethod
+    def _build_initramfs_path(rootfs_dir, cr_workdir):
+        """
+        Create path for initramfs image
+        """
+
+        initrd = get_bitbake_var("INITRD")
+        if not initrd:
+            initrd_dir = get_bitbake_var("DEPLOY_DIR_IMAGE")
+            if not initrd_dir:
+                msger.error("Couldn't find DEPLOY_DIR_IMAGE, exiting.\n")
+
+            image_name = get_bitbake_var("IMAGE_BASENAME")
+            if not image_name:
+                msger.error("Couldn't find IMAGE_BASENAME, exiting.\n")
+
+            image_type = get_bitbake_var("INITRAMFS_FSTYPES")
+            if not image_type:
+                msger.error("Couldn't find INITRAMFS_FSTYPES, exiting.\n")
+
+            machine_arch = get_bitbake_var("MACHINE_ARCH")
+            if not machine_arch:
+                msger.error("Couldn't find MACHINE_ARCH, exiting.\n")
+
+            initrd = "%s/%s-initramfs-%s.%s" \
+                    % (initrd_dir, image_name, machine_arch, image_type)
+
+        if not os.path.exists(initrd):
+            # Create initrd from rootfs directory
+            initrd = "%s/initrd.cpio.gz" % cr_workdir
+            initrd_dir = "%s/INITRD" % cr_workdir
+            shutil.copytree("%s" % rootfs_dir, \
+                            "%s" % initrd_dir, symlinks=True)
+
+            if os.path.isfile("%s/init" % rootfs_dir):
+                shutil.copy2("%s/init" % rootfs_dir, "%s/init" % initrd_dir)
+            elif os.path.lexists("%s/init" % rootfs_dir):
+                os.symlink(os.readlink("%s/init" % rootfs_dir), \
+                            "%s/init" % initrd_dir)
+            elif os.path.isfile("%s/sbin/init" % rootfs_dir):
+                shutil.copy2("%s/sbin/init" % rootfs_dir, \
+                            "%s" % initrd_dir)
+            elif os.path.lexists("%s/sbin/init" % rootfs_dir):
+                os.symlink(os.readlink("%s/sbin/init" % rootfs_dir), \
+                            "%s/init" % initrd_dir)
+            else:
+                msger.error("Couldn't find or build initrd, exiting.\n")
+
+            exec_cmd("cd %s && find . | cpio -o -H newc >%s/initrd.cpio " \
+                    % (initrd_dir, cr_workdir), as_shell=True)
+            exec_cmd("gzip -f -9 -c %s/initrd.cpio > %s" \
+                    % (cr_workdir, initrd), as_shell=True)
+            shutil.rmtree(initrd_dir)
+
+        return initrd
+
+    @classmethod
+    def do_stage_partition(cls, part, source_params, cr, cr_workdir,
+                           oe_builddir, bootimg_dir, kernel_dir,
+                           native_sysroot):
+        """
+        Special content staging called before do_prepare_partition().
+        It cheks if all necessary tools are available, if not
+        tries to instal them.
+        """
+        # Make sure parted is available in native sysroot
+        if not os.path.isfile("%s/usr/sbin/parted" % native_sysroot):
+            msger.info("Building parted-native...\n")
+            exec_cmd("bitbake parted-native")
+
+        # Make sure mkfs.ext2/3/4 is available in native sysroot
+        if not os.path.isfile("%s/sbin/mkfs.ext2" % native_sysroot):
+            msger.info("Building e2fsprogs-native...\n")
+            exec_cmd("bitbake e2fsprogs-native")
+
+        # Make sure syslinux is available in sysroot and in native sysroot
+        syslinux_dir = get_bitbake_var("STAGING_DATADIR")
+        if not syslinux_dir:
+            msger.error("Couldn't find STAGING_DATADIR, exiting.\n")
+        if not os.path.exists("%s/syslinux" % syslinux_dir):
+            msger.info("Building syslinux...\n")
+            exec_cmd("bitbake syslinux")
+            msger.info("Building syslinux-native...\n")
+            exec_cmd("bitbake syslinux-native")
+        if not os.path.exists("%s/syslinux" % syslinux_dir):
+            msger.error("Please build syslinux first\n")
+
+        #Make sure mkisofs is available in native sysroot
+        if not os.path.isfile("%s/usr/bin/mkisofs" % native_sysroot):
+            msger.info("Building cdrtools-native...\n")
+            exec_cmd("bitbake cdrtools-native")
+
+        # Make sure mkfs.vfat is available in native sysroot
+        if not os.path.isfile("%s/sbin/mkfs.vfat" % native_sysroot):
+            msger.info("Building dosfstools-native...\n")
+            exec_cmd("bitbake dosfstools-native")
+
+        # Make sure mtools is available in native sysroot
+        if not os.path.isfile("%s/usr/bin/mcopy" % native_sysroot):
+            msger.info("Building mtools-native...\n")
+            exec_cmd("bitbake mtools-native")
+
+    @classmethod
+    def do_configure_partition(cls, part, source_params, cr, cr_workdir,
+                               oe_builddir, bootimg_dir, kernel_dir,
+                               native_sysroot):
+        """
+        Called before do_prepare_partition(), creates loader-specific config
+        """
+        isodir = "%s/ISO/" % cr_workdir
+
+        if os.path.exists(cr_workdir):
+            shutil.rmtree(cr_workdir)
+
+        install_cmd = "install -d %s " % isodir
+        exec_cmd(install_cmd)
+
+        # Overwrite the name of the created image
+        msger.debug("%s" % source_params)
+        if 'image_name' in source_params and \
+                    source_params['image_name'].strip():
+            cr.name = source_params['image_name'].strip()
+            msger.debug("The name of the image is: %s" % cr.name)
+
+    @classmethod
+    def do_prepare_partition(cls, part, source_params, cr, cr_workdir,
+                             oe_builddir, bootimg_dir, kernel_dir,
+                             rootfs_dir, native_sysroot):
+        """
+        Called to do the actual content population for a partition i.e. it
+        'prepares' the partition to be incorporated into the image.
+        In this case, prepare content for a bootable ISO image.
+        """
+
+        isodir = "%s/ISO" % cr_workdir
+
+        if part.rootfs is None:
+            if not 'ROOTFS_DIR' in rootfs_dir:
+                msger.error("Couldn't find --rootfs-dir, exiting.\n")
+            rootfs_dir = rootfs_dir['ROOTFS_DIR']
+        else:
+            if part.rootfs in rootfs_dir:
+                rootfs_dir = rootfs_dir[part.rootfs]
+            elif part.rootfs:
+                rootfs_dir = part.rootfs
+            else:
+                msg = "Couldn't find --rootfs-dir=%s connection "
+                msg += "or it is not a valid path, exiting.\n"
+                msger.error(msg % part.rootfs)
+
+        if not os.path.isdir(rootfs_dir):
+            rootfs_dir = get_bitbake_var("IMAGE_ROOTFS")
+        if not os.path.isdir(rootfs_dir):
+            msger.error("Couldn't find IMAGE_ROOTFS, exiting.\n")
+
+        part.set_rootfs(rootfs_dir)
+
+        # Prepare rootfs.img
+        hdd_dir = get_bitbake_var("HDDDIR")
+        img_iso_dir = get_bitbake_var("ISODIR")
+
+        rootfs_img = "%s/rootfs.img" % hdd_dir
+        if not os.path.isfile(rootfs_img):
+            rootfs_img = "%s/rootfs.img" % img_iso_dir
+        if not os.path.isfile(rootfs_img):
+            # check if rootfs.img is in deploydir
+            deploy_dir = get_bitbake_var("DEPLOY_DIR_IMAGE")
+            image_name = get_bitbake_var("IMAGE_LINK_NAME")
+            rootfs_img = "%s/%s.%s" \
+                % (deploy_dir, image_name, part.fstype)
+
+        if not os.path.isfile(rootfs_img):
+            # create image file with type specified by --fstype
+            # which contains rootfs
+            du_cmd = "du -bks %s" % rootfs_dir
+            out = exec_cmd(du_cmd)
+            part.set_size(int(out.split()[0]))
+            part.extra_space = 0
+            part.overhead_factor = 1.2
+            part.prepare_rootfs(cr_workdir, oe_builddir, rootfs_dir, \
+                                native_sysroot)
+            rootfs_img = part.source_file
+
+        install_cmd = "install -m 0644 %s %s/rootfs.img" \
+            % (rootfs_img, isodir)
+        exec_cmd(install_cmd)
+
+        # Remove the temporary file created by part.prepare_rootfs()
+        if os.path.isfile(part.source_file):
+            os.remove(part.source_file)
+
+        # Prepare initial ramdisk
+        initrd = "%s/initrd" % hdd_dir
+        if not os.path.isfile(initrd):
+            initrd = "%s/initrd" % img_iso_dir
+        if not os.path.isfile(initrd):
+            initrd = cls._build_initramfs_path(rootfs_dir, cr_workdir)
+
+        install_cmd = "install -m 0644 %s %s/initrd" \
+            % (initrd, isodir)
+        exec_cmd(install_cmd)
+
+        # Remove the temporary file created by _build_initramfs_path function
+        if os.path.isfile("%s/initrd.cpio.gz" % cr_workdir):
+            os.remove("%s/initrd.cpio.gz" % cr_workdir)
+
+        # Install bzImage
+        install_cmd = "install -m 0644 %s/bzImage %s/bzImage" % \
+            (kernel_dir, isodir)
+        exec_cmd(install_cmd)
+
+        #Create bootloader for efi boot
+        try:
+            if source_params['loader'] == 'grub-efi':
+                # Builds grub.cfg if ISODIR didn't exist or
+                # didn't contains grub.cfg
+                bootimg_dir = img_iso_dir
+                if not os.path.exists("%s/EFI/BOOT" % bootimg_dir):
+                    bootimg_dir = "%s/bootimg" % cr_workdir
+                    if os.path.exists(bootimg_dir):
+                        shutil.rmtree(bootimg_dir)
+                    install_cmd = "install -d %s/EFI/BOOT" % bootimg_dir
+                    exec_cmd(install_cmd)
+
+                if not os.path.isfile("%s/EFI/BOOT/boot.cfg" % bootimg_dir):
+                    cls.do_configure_grubefi(part, cr, bootimg_dir)
+
+                # Builds bootx64.efi/bootia32.efi if ISODIR didn't exist or
+                # didn't contains it
+                target_arch = get_bitbake_var("TARGET_SYS")
+                if not target_arch:
+                    msger.error("Coludn't find target architecture\n")
+
+                if re.match("x86_64", target_arch):
+                    grub_target = 'x86_64-efi'
+                    grub_image = "bootx64.efi"
+                elif re.match('i.86', target_arch):
+                    grub_target = 'i386-efi'
+                    grub_image = "bootia32.efi"
+                else:
+                    msger.error("grub-efi is incompatible with target %s\n" \
+                                % target_arch)
+
+                if not os.path.isfile("%s/EFI/BOOT/%s" \
+                                % (bootimg_dir, grub_image)):
+                    grub_path = get_bitbake_var("STAGING_LIBDIR")
+                    if not grub_path:
+                        msger.error("Couldn't find STAGING_LIBDIR, exiting.\n")
+
+                    grub_core = "%s/grub/%s" % (grub_path, grub_target)
+                    if not os.path.exists(grub_core):
+                        msger.info("Building grub-efi...\n")
+                        exec_cmd("bitbake grub-efi")
+                    if not os.path.exists(grub_core):
+                        msger.error("Please build grub-efi first\n")
+
+                    grub_cmd = "grub-mkimage -p '/EFI/BOOT' "
+                    grub_cmd += "-d %s "  % grub_core
+                    grub_cmd += "-O %s -o %s/EFI/BOOT/%s " \
+                                % (grub_target, bootimg_dir, grub_image)
+                    grub_cmd += "part_gpt part_msdos ntfs ntfscomp fat ext2 "
+                    grub_cmd += "normal chain boot configfile linux multiboot "
+                    grub_cmd += "search efi_gop efi_uga font gfxterm gfxmenu "
+                    grub_cmd += "terminal minicmd test iorw loadenv echo help "
+                    grub_cmd += "reboot serial terminfo iso9660 loopback tar "
+                    grub_cmd += "memdisk ls search_fs_uuid udf btrfs xfs lvm "
+                    grub_cmd += "reiserfs ata "
+                    exec_native_cmd(grub_cmd, native_sysroot)
+
+            else:
+                # TODO: insert gummiboot stuff
+                msger.error("unrecognized bootimg-efi loader: %s" \
+                            % source_params['loader'])
+        except KeyError:
+            msger.error("bootimg-efi requires a loader, none specified")
+
+        if os.path.exists("%s/EFI/BOOT" % isodir):
+            shutil.rmtree("%s/EFI/BOOT" % isodir)
+
+        shutil.copytree(bootimg_dir+"/EFI/BOOT", isodir+"/EFI/BOOT")
+
+        # If exists, remove cr_workdir/bootimg temporary folder
+        if os.path.exists("%s/bootimg" % cr_workdir):
+            shutil.rmtree("%s/bootimg" % cr_workdir)
+
+        # Create efi.img that contains bootloader files for EFI booting
+        # if ISODIR didn't exist or didn't contains it
+        if os.path.isfile("%s/efi.img" % img_iso_dir):
+            install_cmd = "install -m 0644 %s/efi.img %s/efi.img" % \
+                (img_iso_dir, isodir)
+            exec_cmd(install_cmd)
+        else:
+            du_cmd = "du -bks %s/EFI" % isodir
+            out = exec_cmd(du_cmd)
+            blocks = int(out.split()[0])
+            # Add some extra space for file system overhead
+            blocks += 100
+            msg = "Added 100 extra blocks to %s to get to %d total blocks" \
+                    % (part.mountpoint, blocks)
+            msger.debug(msg)
+
+            # 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 += (16 - (blocks % 16))
+
+            # dosfs image for EFI boot
+            bootimg = "%s/efi.img" % isodir
+
+            dosfs_cmd = 'mkfs.vfat -n "EFIimg" -S 512 -C %s %d' \
+                        % (bootimg, blocks)
+            exec_native_cmd(dosfs_cmd, native_sysroot)
+
+            mmd_cmd = "mmd -i %s ::/EFI" % bootimg
+            exec_native_cmd(mmd_cmd, native_sysroot)
+
+            mcopy_cmd = "mcopy -i %s -s %s/EFI/* ::/EFI/" \
+                        % (bootimg, isodir)
+            exec_native_cmd(mcopy_cmd, native_sysroot)
+
+            chmod_cmd = "chmod 644 %s" % bootimg
+            exec_cmd(chmod_cmd)
+
+        # Prepare files for legacy boot
+        syslinux_dir = get_bitbake_var("STAGING_DATADIR")
+        if not syslinux_dir:
+            msger.error("Couldn't find STAGING_DATADIR, exiting.\n")
+
+        if os.path.exists("%s/isolinux" % isodir):
+            shutil.rmtree("%s/isolinux" % isodir)
+
+        install_cmd = "install -d %s/isolinux" % isodir
+        exec_cmd(install_cmd)
+
+        cls.do_configure_syslinux(cr, cr_workdir)
+
+        install_cmd = "install -m 444 %s/syslinux/ldlinux.sys " % syslinux_dir
+        install_cmd += "%s/isolinux/ldlinux.sys" % isodir
+        exec_cmd(install_cmd)
+
+        install_cmd = "install -m 444 %s/syslinux/isohdpfx.bin " % syslinux_dir
+        install_cmd += "%s/isolinux/isohdpfx.bin" % isodir
+        exec_cmd(install_cmd)
+
+        install_cmd = "install -m 644 %s/syslinux/isolinux.bin " % syslinux_dir
+        install_cmd += "%s/isolinux/isolinux.bin" % isodir
+        exec_cmd(install_cmd)
+
+        install_cmd = "install -m 644 %s/syslinux/ldlinux.c32 " % syslinux_dir
+        install_cmd += "%s/isolinux/ldlinux.c32" % isodir
+        exec_cmd(install_cmd)
+
+        #create ISO image
+        iso_img = "%s/tempiso_img.iso" % cr_workdir
+        iso_bootimg = "isolinux/isolinux.bin"
+        iso_bootcat = "isolinux/boot.cat"
+        efi_img = "efi.img"
+
+        mkisofs_cmd = "mkisofs -V %s " % part.label
+        mkisofs_cmd += "-o %s -U " % iso_img
+        mkisofs_cmd += "-J -joliet-long -r -iso-level 2 -b %s " % iso_bootimg
+        mkisofs_cmd += "-c %s -no-emul-boot -boot-load-size 4 " % iso_bootcat
+        mkisofs_cmd += "-boot-info-table -eltorito-alt-boot "
+        mkisofs_cmd += "-eltorito-platform 0xEF -eltorito-boot %s " % efi_img
+        mkisofs_cmd += "-no-emul-boot %s " % isodir
+
+        msger.debug("running command: %s" % mkisofs_cmd)
+        exec_native_cmd(mkisofs_cmd, native_sysroot)
+
+        shutil.rmtree(isodir)
+
+        du_cmd = "du -Lbks %s" % iso_img
+        out = exec_cmd(du_cmd)
+        isoimg_size = int(out.split()[0])
+
+        part.set_size(isoimg_size)
+        part.set_source_file(iso_img)
+
+    @classmethod
+    def do_install_disk(cls, disk, disk_name, cr, workdir, oe_builddir,
+                        bootimg_dir, kernel_dir, native_sysroot):
+        """
+        Called after all partitions have been prepared and assembled into a
+        disk image.  In this case, we insert/modify the MBR using isohybrid
+        utility for booting via BIOS from disk storage devices.
+        """
+
+        full_path = cr._full_path(workdir, disk_name, "direct")
+        iso_img = "%s.p1" % full_path
+        full_path_iso = cr._full_path(workdir, disk_name, "iso")
+
+        isohybrid_cmd = "isohybrid -u %s" % iso_img
+        msger.debug("running command: %s" % \
+                    isohybrid_cmd)
+        exec_native_cmd(isohybrid_cmd, native_sysroot)
+
+        # Replace the image created by direct plugin with the one created by
+        # mkisofs command. This is necessary because the iso image created by
+        # mkisofs has a very specific MBR is system area of the ISO image, and
+        # direct plugin adds and configures an another MBR.
+        msger.debug("Replaceing the image created by direct plugin\n")
+        os.remove(full_path)
+        shutil.copy2(iso_img, full_path_iso)
+        shutil.copy2(full_path_iso, full_path)
+
+        # Remove temporary ISO file
+        os.remove(iso_img)