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wic: add support for bootable pcbios partition with Xen hypervisor
New bootimg-biosxen wic plugin to populate a boot partition for launching Xen and dom0. Includes example kickstart wks files to generate disk images to boot into Xen from PC BIOS. eg: wic create directdisk-xen -e xen-image-minimal and write the resulting image file to a disk for boot. Signed-off-by: Christopher Clark <christopher.clark6@baesystems.com> Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
This commit is contained in:
Christopher Clark
Bruce Ashfield
parent
e0884db20b
commit
c66da6821f
1
.gitignore
vendored
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.gitignore
vendored
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@ -5,3 +5,4 @@ pyshtables.py
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*.rej
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/*.patch
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*~
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scripts/lib/wic/plugins/source/__pycache__
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212
scripts/lib/wic/plugins/source/bootimg-biosxen.py
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212
scripts/lib/wic/plugins/source/bootimg-biosxen.py
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2 as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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#
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# DESCRIPTION
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# This implements the 'bootimg-biosxen' source plugin class for 'wic'
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#
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# Bootloader arguments: Xen args are separated from Linux ones at '---':
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# eg.
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# bootloader --append="console=com1,vga com1=115200,8n1 --- console=hvc0"
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#
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# Optional source param: initrd
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# accepts multiple ramdisk files to be supplied to multiboot.
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# eg.
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# part /boot --source bootimg-biosxen --sourceparams="initrd=foo.initrd;bar.initrd"
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#
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# AUTHORS
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# Christopher Clark <christopher.w.clark [at] gmail.com>
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# Elements derived from bootimg-biosplusefi.py by:
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# William Bourque <wbourque [at] gmail.com>
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import logging
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import os
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import types
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from wic import WicError
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import wic.pluginbase
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from importlib.machinery import SourceFileLoader
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from wic.misc import (exec_cmd, get_bitbake_var)
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logger = logging.getLogger('wic')
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class BootimgBiosXenPlugin(wic.pluginbase.SourcePlugin):
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"""
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Create MBR boot partition including files for Xen
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"""
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name = 'bootimg-biosxen'
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__PCBIOS_MODULE_NAME = "bootimg-pcbios"
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__imgBiosObj = None
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@classmethod
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def __init__(cls):
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"""
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Constructor (init)
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"""
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# original comment from bootimg-biosplusefi.py :
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# "XXX For some reasons, __init__ constructor is never called.
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# Something to do with how pluginbase works?"
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cls.__instanciateBIOSClass()
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@classmethod
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def __instanciateBIOSClass(cls):
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"""
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"""
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# Import bootimg-pcbios (class name "BootimgPcbiosPlugin")
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modulePath = os.path.join(os.path.dirname(wic.pluginbase.__file__),
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"plugins", "source",
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cls.__PCBIOS_MODULE_NAME + ".py")
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loader = SourceFileLoader(cls.__PCBIOS_MODULE_NAME, modulePath)
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mod = types.ModuleType(loader.name)
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loader.exec_module(mod)
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cls.__imgBiosObj = mod.BootimgPcbiosPlugin()
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@classmethod
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def do_install_disk(cls, disk, disk_name, creator, workdir, oe_builddir,
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bootimg_dir, kernel_dir, native_sysroot):
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"""
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Called after all partitions have been prepared and assembled into a
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disk image.
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"""
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if not cls.__imgBiosObj:
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cls.__instanciateBIOSClass()
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cls.__imgBiosObj.do_install_disk(disk, disk_name, creator, workdir,
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oe_builddir, bootimg_dir, kernel_dir,
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native_sysroot)
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@classmethod
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def do_configure_partition(cls, part, source_params, creator, cr_workdir,
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oe_builddir, bootimg_dir, kernel_dir,
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native_sysroot):
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"""
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Called before do_prepare_partition(), creates syslinux config
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"""
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if not cls.__imgBiosObj:
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cls.__instanciateBIOSClass()
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bootloader = creator.ks.bootloader
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if not bootloader.configfile:
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splash = os.path.join(cr_workdir, "/hdd/boot/splash.jpg")
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if os.path.exists(splash):
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splashline = "menu background splash.jpg"
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else:
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splashline = ""
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syslinux_conf = ""
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syslinux_conf += "PROMPT 0\n"
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syslinux_conf += "TIMEOUT " + str(bootloader.timeout) + "\n"
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syslinux_conf += "\n"
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syslinux_conf += "ALLOWOPTIONS 1\n"
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syslinux_conf += "\n"
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if splashline:
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syslinux_conf += "%s\n" % splashline
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syslinux_conf += "DEFAULT boot\n"
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syslinux_conf += "LABEL boot\n"
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syslinux_conf += " KERNEL mboot.c32\n"
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# Split the bootloader args at '---' to separate the Xen args
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# from the Linux kernel args.
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# The Xen args here are defaults; overridden by bootloader append.
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xen_args = "console=com1,vga com1=115200,8n1"
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kernel_append = ""
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if bootloader.append:
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separator_pos = bootloader.append.find('---')
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if separator_pos != -1:
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xen_args = bootloader.append[:separator_pos]
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kernel_append = bootloader.append[separator_pos+3:]
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else:
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kernel_append = bootloader.append
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kernel_args = "label=boot root=%s %s" % \
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(creator.rootdev, kernel_append)
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syslinux_conf += " APPEND /xen.gz %s --- /vmlinuz %s" % \
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(xen_args, kernel_args)
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initrd = source_params.get('initrd')
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if initrd:
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initrds = initrd.split(';')
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for initrd_file in initrds:
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syslinux_conf += " --- /%s" % os.path.basename(initrd_file)
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syslinux_conf += "\n"
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logger.debug("Writing syslinux config %s/hdd/boot/syslinux.cfg",
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cr_workdir)
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hdddir = "%s/hdd/boot" % cr_workdir
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install_cmd = "install -d %s" % hdddir
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exec_cmd(install_cmd)
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cfg = open("%s/hdd/boot/syslinux.cfg" % cr_workdir, "w")
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cfg.write(syslinux_conf)
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cfg.close()
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else:
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cls.__imgBiosObj.do_configure_partition(part, source_params,
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creator, cr_workdir,
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oe_builddir, bootimg_dir,
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kernel_dir, native_sysroot)
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@classmethod
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def do_prepare_partition(cls, part, source_params, creator, cr_workdir,
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oe_builddir, bootimg_dir, kernel_dir,
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rootfs_dir, native_sysroot):
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"""
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Called to do the actual content population for a partition i.e. it
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'prepares' the partition to be incorporated into the image.
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"""
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if not cls.__imgBiosObj:
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cls.__instanciateBIOSClass()
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bootimg_dir = cls.__imgBiosObj._get_bootimg_dir(bootimg_dir, 'syslinux')
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hdddir = "%s/hdd/boot" % cr_workdir
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# machine-deduction logic originally from isoimage-isohybrid.py
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initrd_dir = get_bitbake_var("DEPLOY_DIR_IMAGE")
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if not initrd_dir:
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raise WicError("Couldn't find DEPLOY_DIR_IMAGE, exiting.")
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machine = os.path.basename(initrd_dir)
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xen = "xen-" + machine + ".gz"
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cmds = ["install -m 0644 %s/%s %s/xen.gz" %
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(kernel_dir, xen, hdddir),
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"install -m 0644 %s/syslinux/mboot.c32 %s/mboot.c32" %
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(bootimg_dir, hdddir)]
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initrd = source_params.get('initrd')
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# Allow multiple 'initrds', as per the bootimg-efi class.
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# This can be used to install additional binaries for multiboot.
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# eg. TXT ACMs, XSM/Flask policy file, microcode binary
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if initrd:
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initrds = initrd.split(';')
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for initrd_file in initrds:
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cmds.append("install -m 0644 %s/%s %s/%s" %
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(kernel_dir, initrd_file, hdddir,
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os.path.basename(initrd_file)))
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for install_cmd in cmds:
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exec_cmd(install_cmd)
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cls.__imgBiosObj.do_prepare_partition(part, source_params,
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creator, cr_workdir,
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oe_builddir, bootimg_dir,
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kernel_dir, rootfs_dir,
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native_sysroot)
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17
wic/directdisk-bootloader-xen.cfg
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17
wic/directdisk-bootloader-xen.cfg
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ALLOWOPTIONS 1
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DEFAULT boot
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TIMEOUT 10
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PROMPT 1
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SERIAL 0 115200
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UI vesamenu.c32
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menu title Select boot options
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menu tabmsg Press [Tab] to edit, [Return] to select
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LABEL boot
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KERNEL mboot.c32
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APPEND /xen.gz console=com1,vga com1=115200,8n1 --- /vmlinuz quiet console=hvc0 root=LABEL=root rw rootwait panic=10
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LABEL verbose
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KERNEL mboot.c32
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APPEND /xen.gz console=com1,vga com1=115200,8n1 loglvl=all guest_loglvl=all --- /vmlinuz quiet console=hvc0 earlyprintk=xen root=LABEL=root rw rootwait panic=10
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12
wic/directdisk-bootloader-xen.wks
Normal file
12
wic/directdisk-bootloader-xen.wks
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@ -0,0 +1,12 @@
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# short-description: Create a 'pcbios' direct disk image with Xen hypervisor and bootloader config
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# long-description: Creates a partitioned legacy BIOS disk image to boot Xen
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# with a bootloader config that the user can directly dd to boot media.
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# Boot files are located on the first vfat partition.
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part /boot --source bootimg-biosxen --ondisk sda --label boot --active --align 1024
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# For the main partition, it can be useful to add additional space for VMs;
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# eg. increase partition size by appending: --size 10G
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part / --source rootfs --ondisk sda --use-uuid --fstype=ext4 --label root --align 1024
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bootloader --configfile="directdisk-bootloader-xen.cfg"
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10
wic/directdisk-xen.wks
Normal file
10
wic/directdisk-xen.wks
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# short-description: Create a 'pcbios' direct disk image with Xen hypervisor
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# long-description: Creates a partitioned legacy BIOS disk image to boot Xen
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# that the user can directly dd to boot media. Boot files are located on the
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# first vfat partition.
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part /boot --source bootimg-biosxen --ondisk sda --label boot --active --align 1024
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# For the main partition, it can be useful to add additional space for VMs:
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# eg. increase partition size by appending: --size 10G
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part / --source rootfs --ondisk sda --use-uuid --fstype=ext4 --label root --align 1024
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