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authorWilliam Bourque <wbourque@gmail.com>2019-07-22 16:11:29 -0400
committerRichard Purdie <richard.purdie@linuxfoundation.org>2019-07-23 22:26:28 +0100
commitdef9b64e27974e3bcf0356e76a8d0aa8f01cdc5c (patch)
tree0c29716607b15ca0991a7219f69efece97b8f439 /scripts/lib/wic
parentf2d6ec0af1b7ab7ae8e7c65f47b48388c8730b59 (diff)
downloadpoky-def9b64e27974e3bcf0356e76a8d0aa8f01cdc5c.tar.gz
wic/plugins: Source that support both EFI and BIOS
Add a source plugin that support both EFI and legacy PC-Bios. While using this plugin, both bootloaders configurations reside in the same /boot partitions. This plugin has very little code : to avoid code duplication, we simply re-import bootimg-pcbios and bootmg-efi source and call both their SourcePlugin methods. (From OE-Core rev: c8545d54139c6c48bffd1dd1d39d79891626c6f7) Signed-off-by: William Bourque <wbourque@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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diff --git a/scripts/lib/wic/plugins/source/bootimg-biosplusefi.py b/scripts/lib/wic/plugins/source/bootimg-biosplusefi.py
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1#
2# This program is free software; you can redistribute it and/or modify
3# it under the terms of the GNU General Public License version 2 as
4# published by the Free Software Foundation.
5#
6# This program is distributed in the hope that it will be useful,
7# but WITHOUT ANY WARRANTY; without even the implied warranty of
8# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
9# GNU General Public License for more details.
10#
11# You should have received a copy of the GNU General Public License along
12# with this program; if not, write to the Free Software Foundation, Inc.,
13# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
14#
15# DESCRIPTION
16# This implements the 'bootimg-biosplusefi' source plugin class for 'wic'
17#
18# AUTHORS
19# William Bourque <wbourque [at) gmail.com>
20
21import types
22
23from wic.pluginbase import SourcePlugin
24from importlib.machinery import SourceFileLoader
25
26class BootimgBiosPlusEFIPlugin(SourcePlugin):
27 """
28 Create MBR + EFI boot partition
29
30 This plugin creates a boot partition that contains both
31 legacy BIOS and EFI content. It will be able to boot from both.
32 This is useful when managing PC fleet with some older machines
33 without EFI support.
34
35 Note it is possible to create an image that can boot from both
36 legacy BIOS and EFI by defining two partitions : one with arg
37 --source bootimg-efi and another one with --source bootimg-pcbios.
38 However, this method has the obvious downside that it requires TWO
39 partitions to be created on the storage device.
40 Both partitions will also be marked as "bootable" which does not work on
41 most BIOS, has BIOS often uses the "bootable" flag to determine
42 what to boot. If you have such a BIOS, you need to manually remove the
43 "bootable" flag from the EFI partition for the drive to be bootable.
44 Having two partitions also seems to confuse wic : the content of
45 the first partition will be duplicated into the second, even though it
46 will not be used at all.
47
48 Also, unlike "isoimage-isohybrid" that also does BIOS and EFI, this plugin
49 allows you to have more than only a single rootfs partitions and does
50 not turn the rootfs into an initramfs RAM image.
51
52 This plugin is made to put everything into a single /boot partition so it
53 does not have the limitations listed above.
54
55 The plugin is made so it does tries not to reimplement what's already
56 been done in other plugins; as such it imports "bootimg-pcbios"
57 and "bootimg-efi".
58 Plugin "bootimg-pcbios" is used to generate legacy BIOS boot.
59 Plugin "bootimg-efi" is used to generate the UEFI boot. Note that it
60 requires a --sourceparams argument to know which loader to use; refer
61 to "bootimg-efi" code/documentation for the list of loader.
62
63 Imports are handled with "SourceFileLoader" from importlib as it is
64 otherwise very difficult to import module that has hyphen "-" in their
65 filename.
66 The SourcePlugin() methods used in the plugins (do_install_disk,
67 do_configure_partition, do_prepare_partition) are then called on both,
68 beginning by "bootimg-efi".
69
70 Plugin options, such as "--sourceparams" can still be passed to a
71 plugin, as long they does not cause issue in the other plugin.
72
73 Example wic configuration:
74 part /boot --source bootimg-biosplusefi --sourceparams="loader=grub-efi"\\
75 --ondisk sda --label os_boot --active --align 1024 --use-uuid
76 """
77
78 name = 'bootimg-biosplusefi'
79
80 __PCBIOS_MODULE_NAME = "bootimg-pcbios"
81 __EFI_MODULE_NAME = "bootimg-efi"
82
83 __imgEFIObj = None
84 __imgBiosObj = None
85
86 @classmethod
87 def __init__(cls):
88 """
89 Constructor (init)
90 """
91
92 # XXX
93 # For some reasons, __init__ constructor is never called.
94 # Something to do with how pluginbase works?
95 cls.__instanciateSubClasses()
96
97 @classmethod
98 def __instanciateSubClasses(cls):
99 """
100
101 """
102
103 # Import bootimg-pcbios (class name "BootimgPcbiosPlugin")
104 modulePath = os.path.join(os.path.dirname(os.path.realpath(__file__)),
105 cls.__PCBIOS_MODULE_NAME + ".py")
106 loader = SourceFileLoader(cls.__PCBIOS_MODULE_NAME, modulePath)
107 mod = types.ModuleType(loader.name)
108 loader.exec_module(mod)
109 cls.__imgBiosObj = mod.BootimgPcbiosPlugin()
110
111 # Import bootimg-efi (class name "BootimgEFIPlugin")
112 modulePath = os.path.join(os.path.dirname(os.path.realpath(__file__)),
113 cls.__EFI_MODULE_NAME + ".py")
114 loader = SourceFileLoader(cls.__EFI_MODULE_NAME, modulePath)
115 mod = types.ModuleType(loader.name)
116 loader.exec_module(mod)
117 cls.__imgEFIObj = mod.BootimgEFIPlugin()
118
119 @classmethod
120 def do_install_disk(cls, disk, disk_name, creator, workdir, oe_builddir,
121 bootimg_dir, kernel_dir, native_sysroot):
122 """
123 Called after all partitions have been prepared and assembled into a
124 disk image.
125 """
126
127 if ( (not cls.__imgEFIObj) or (not cls.__imgBiosObj) ):
128 cls.__instanciateSubClasses()
129
130 cls.__imgEFIObj.do_install_disk(
131 disk,
132 disk_name,
133 creator,
134 workdir,
135 oe_builddir,
136 bootimg_dir,
137 kernel_dir,
138 native_sysroot)
139
140 cls.__imgBiosObj.do_install_disk(
141 disk,
142 disk_name,
143 creator,
144 workdir,
145 oe_builddir,
146 bootimg_dir,
147 kernel_dir,
148 native_sysroot)
149
150 @classmethod
151 def do_configure_partition(cls, part, source_params, creator, cr_workdir,
152 oe_builddir, bootimg_dir, kernel_dir,
153 native_sysroot):
154 """
155 Called before do_prepare_partition()
156 """
157
158 if ( (not cls.__imgEFIObj) or (not cls.__imgBiosObj) ):
159 cls.__instanciateSubClasses()
160
161 cls.__imgEFIObj.do_configure_partition(
162 part,
163 source_params,
164 creator,
165 cr_workdir,
166 oe_builddir,
167 bootimg_dir,
168 kernel_dir,
169 native_sysroot)
170
171 cls.__imgBiosObj.do_configure_partition(
172 part,
173 source_params,
174 creator,
175 cr_workdir,
176 oe_builddir,
177 bootimg_dir,
178 kernel_dir,
179 native_sysroot)
180
181 @classmethod
182 def do_prepare_partition(cls, part, source_params, creator, cr_workdir,
183 oe_builddir, bootimg_dir, kernel_dir,
184 rootfs_dir, native_sysroot):
185 """
186 Called to do the actual content population for a partition i.e. it
187 'prepares' the partition to be incorporated into the image.
188 """
189
190 if ( (not cls.__imgEFIObj) or (not cls.__imgBiosObj) ):
191 cls.__instanciateSubClasses()
192
193 cls.__imgEFIObj.do_prepare_partition(
194 part,
195 source_params,
196 creator,
197 cr_workdir,
198 oe_builddir,
199 bootimg_dir,
200 kernel_dir,
201 rootfs_dir,
202 native_sysroot)
203
204 cls.__imgBiosObj.do_prepare_partition(
205 part,
206 source_params,
207 creator,
208 cr_workdir,
209 oe_builddir,
210 bootimg_dir,
211 kernel_dir,
212 rootfs_dir,
213 native_sysroot)