wic/plugins: Source that support both EFI and BIOS

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+#
+# 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 'bootimg-biosplusefi' source plugin class for 'wic'
+#
+# AUTHORS
+# William Bourque <wbourque [at) gmail.com>
+
+import types
+
+from wic.pluginbase import SourcePlugin
+from importlib.machinery import SourceFileLoader
+
+class BootimgBiosPlusEFIPlugin(SourcePlugin):
+    """
+    Create MBR + EFI boot partition
+
+    This plugin creates a boot partition that contains both
+    legacy BIOS and EFI content. It will be able to boot from both.
+    This is useful when managing PC fleet with some older machines
+    without EFI support.
+
+    Note it is possible to create an image that can boot from both
+    legacy BIOS and EFI by defining two partitions : one with arg
+    --source bootimg-efi  and another one with --source bootimg-pcbios.
+    However, this method has the obvious downside that it requires TWO
+    partitions to be created on the storage device.
+    Both partitions will also be marked as "bootable" which does not work on
+    most BIOS, has BIOS often uses the "bootable" flag to determine
+    what to boot. If you have such a BIOS, you need to manually remove the
+    "bootable" flag from the EFI partition for the drive to be bootable.
+    Having two partitions also seems to confuse wic : the content of
+    the first partition will be duplicated into the second, even though it
+    will not be used at all.
+
+    Also, unlike "isoimage-isohybrid" that also does BIOS and EFI, this plugin
+    allows you to have more than only a single rootfs partitions and does
+    not turn the rootfs into an initramfs RAM image.
+
+    This plugin is made to put everything into a single /boot partition so it
+    does not have the limitations listed above.
+
+    The plugin is made so it does tries not to reimplement what's already
+    been done in other plugins; as such it imports "bootimg-pcbios"
+    and "bootimg-efi".
+    Plugin "bootimg-pcbios" is used to generate legacy BIOS boot.
+    Plugin "bootimg-efi" is used to generate the UEFI boot. Note that it
+    requires a --sourceparams argument to know which loader to use; refer
+    to "bootimg-efi" code/documentation for the list of loader.
+
+    Imports are handled with "SourceFileLoader" from importlib as it is
+    otherwise very difficult to import module that has hyphen "-" in their
+    filename.
+    The SourcePlugin() methods used in the plugins (do_install_disk,
+    do_configure_partition, do_prepare_partition) are then called on both,
+    beginning by "bootimg-efi".
+
+    Plugin options, such as "--sourceparams" can still be passed to a
+    plugin, as long they does not cause issue in the other plugin.
+
+    Example wic configuration:
+    part /boot --source bootimg-biosplusefi --sourceparams="loader=grub-efi"\\
+               --ondisk sda --label os_boot --active --align 1024 --use-uuid
+    """
+
+    name = 'bootimg-biosplusefi'
+
+    __PCBIOS_MODULE_NAME = "bootimg-pcbios"
+    __EFI_MODULE_NAME = "bootimg-efi"
+
+    __imgEFIObj = None
+    __imgBiosObj = None
+
+    @classmethod
+    def __init__(cls):
+        """
+        Constructor (init)
+        """
+
+        # XXX
+        # For some reasons, __init__ constructor is never called.
+        # Something to do with how pluginbase works?
+        cls.__instanciateSubClasses()
+
+    @classmethod
+    def __instanciateSubClasses(cls):
+        """
+
+        """
+
+        # Import bootimg-pcbios (class name "BootimgPcbiosPlugin")
+        modulePath = os.path.join(os.path.dirname(os.path.realpath(__file__)),
+                                  cls.__PCBIOS_MODULE_NAME + ".py")
+        loader = SourceFileLoader(cls.__PCBIOS_MODULE_NAME, modulePath)
+        mod = types.ModuleType(loader.name)
+        loader.exec_module(mod)
+        cls.__imgBiosObj = mod.BootimgPcbiosPlugin()
+
+        # Import bootimg-efi (class name "BootimgEFIPlugin")
+        modulePath = os.path.join(os.path.dirname(os.path.realpath(__file__)),
+                                  cls.__EFI_MODULE_NAME + ".py")
+        loader = SourceFileLoader(cls.__EFI_MODULE_NAME, modulePath)
+        mod = types.ModuleType(loader.name)
+        loader.exec_module(mod)
+        cls.__imgEFIObj = mod.BootimgEFIPlugin()
+
+    @classmethod
+    def do_install_disk(cls, disk, disk_name, creator, workdir, oe_builddir,
+                        bootimg_dir, kernel_dir, native_sysroot):
+        """
+        Called after all partitions have been prepared and assembled into a
+        disk image.
+        """
+
+        if ( (not cls.__imgEFIObj) or (not cls.__imgBiosObj) ):
+            cls.__instanciateSubClasses()
+
+        cls.__imgEFIObj.do_install_disk(
+            disk,
+            disk_name,
+            creator,
+            workdir,
+            oe_builddir,
+            bootimg_dir,
+            kernel_dir,
+            native_sysroot)
+
+        cls.__imgBiosObj.do_install_disk(
+            disk,
+            disk_name,
+            creator,
+            workdir,
+            oe_builddir,
+            bootimg_dir,
+            kernel_dir,
+            native_sysroot)
+
+    @classmethod
+    def do_configure_partition(cls, part, source_params, creator, cr_workdir,
+                               oe_builddir, bootimg_dir, kernel_dir,
+                               native_sysroot):
+        """
+        Called before do_prepare_partition()
+        """
+
+        if ( (not cls.__imgEFIObj) or (not cls.__imgBiosObj) ):
+            cls.__instanciateSubClasses()
+
+        cls.__imgEFIObj.do_configure_partition(
+            part,
+            source_params,
+            creator,
+            cr_workdir,
+            oe_builddir,
+            bootimg_dir,
+            kernel_dir,
+            native_sysroot)
+
+        cls.__imgBiosObj.do_configure_partition(
+            part,
+            source_params,
+            creator,
+            cr_workdir,
+            oe_builddir,
+            bootimg_dir,
+            kernel_dir,
+            native_sysroot)
+
+    @classmethod
+    def do_prepare_partition(cls, part, source_params, creator, 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.
+        """
+
+        if ( (not cls.__imgEFIObj) or (not cls.__imgBiosObj) ):
+            cls.__instanciateSubClasses()
+
+        cls.__imgEFIObj.do_prepare_partition(
+            part,
+            source_params,
+            creator,
+            cr_workdir,
+            oe_builddir,
+            bootimg_dir,
+            kernel_dir,
+            rootfs_dir,
+            native_sysroot)
+
+        cls.__imgBiosObj.do_prepare_partition(
+            part,
+            source_params,
+            creator,
+            cr_workdir,
+            oe_builddir,
+            bootimg_dir,
+            kernel_dir,
+            rootfs_dir,
+            native_sysroot)

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+# short-description: This file is used in oe-selftest wic module to test biosplusefi plugin
+
+part /boot --source bootimg-biosplusefi --sourceparams="loader=grub-efi" --active --align 1024 --use-uuid
+part / --source rootfs --fstype=ext4 --align 1024 --use-uuid
+
+bootloader  --timeout=0 --append="console=ttyS0,115200n8"

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