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351a10ccd6
In order to create a msdos partition table disk image that can auto
expand after the image is copied to an SD card, wic needs the ability
to have a primary partition as the last entry. The desired use case
is to be able to create an A/B update partition image scheme with a
/var volume that can be auto expanded to the remainder of the SD card
at run time.
The typical .wks file will look similar to the following:
bootloader --ptable msdos
part / --source rawcopy --sourceparams="file=u-boot.imx" \
--ondisk mmcblk --no-table --align 1 --size 1
part /boot --source bootimg-partition \
--ondisk mmcblk --fstype=vfat --label boot --active --align 4 --size 16
part / --source rawcopy --sourceparams="file=imx6_boot.otaimg" \
--ondisk mmcblk --fstype=ext4 --label otaboot --align 4 --type logical
part / --source rawcopy --sourceparams="file=imx6.otaimg" \
--ondisk mmcblk --fstype=ext4 --label otaroot --align 4 --type logical
part / --source rawcopy --sourceparams="file=imx6_boot.otaimg" \
--ondisk mmcblk --fstype=ext4 --label otaboot_b --align 4 --type logical
part / --source rawcopy --sourceparams="file=imx6.otaimg" \
--ondisk mmcblk --fstype=ext4 --label otaroot_b --align 4 --type logical
part /var --source rawcopy --sourceparams="file=imx6_var.otaimg" \
--ondisk mmcblk --fstype=ext4 --label fluxdata --align 4
Without the patch applied, wic will generate an SD card image that looks like:
Disk boot.img: 890940s
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:
Number Start End Size Type File system Flags
1 2056s 48001s 45946s primary fat16 lba
2 48008s 132467s 84460s primary ext4
3 132472s 454467s 321996s primary ext4
4 454471s 890939s 436469s extended lba
5 454472s 538931s 84460s logical ext4
6 538936s 860931s 321996s logical ext4
7 860936s 890939s 30004s logical ext4 boot
With the patch applied a primary partition can be created at the end
of the image which can be expanded to fill the free space on the media
where the image has been copied, which looks like:
Disk boot.img: 890940s
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:
Number Start End Size Type File system Flags
1 2056s 48001s 45946s primary fat16 lba
2 48007s 860931s 812925s extended lba
5 48008s 132467s 84460s logical ext4
6 132472s 454467s 321996s logical ext4
7 454472s 538931s 84460s logical ext4
8 538936s 860931s 321996s logical ext4
3 860936s 890939s 30004s primary ext4 boot
(From OE-Core rev: 56add7cc547e0113cdf980579d1421b14cc233e5)
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
413 lines
16 KiB
Python
413 lines
16 KiB
Python
#
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# Copyright (c) 2013-2016 Intel Corporation.
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#
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# SPDX-License-Identifier: GPL-2.0-only
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#
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# DESCRIPTION
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# This module provides the OpenEmbedded partition object definitions.
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#
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# AUTHORS
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# Tom Zanussi <tom.zanussi (at] linux.intel.com>
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# Ed Bartosh <ed.bartosh> (at] linux.intel.com>
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import logging
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import os
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import uuid
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from wic import WicError
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from wic.misc import exec_cmd, exec_native_cmd, get_bitbake_var
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from wic.pluginbase import PluginMgr
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logger = logging.getLogger('wic')
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class Partition():
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def __init__(self, args, lineno):
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self.args = args
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self.active = args.active
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self.align = args.align
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self.disk = args.disk
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self.device = None
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self.extra_space = args.extra_space
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self.exclude_path = args.exclude_path
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self.fsopts = args.fsopts
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self.fstype = args.fstype
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self.label = args.label
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self.use_label = args.use_label
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self.mkfs_extraopts = args.mkfs_extraopts
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self.mountpoint = args.mountpoint
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self.no_table = args.no_table
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self.num = None
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self.overhead_factor = args.overhead_factor
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self.part_name = args.part_name
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self.part_type = args.part_type
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self.rootfs_dir = args.rootfs_dir
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self.size = args.size
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self.fixed_size = args.fixed_size
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self.source = args.source
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self.sourceparams = args.sourceparams
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self.system_id = args.system_id
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self.use_uuid = args.use_uuid
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self.uuid = args.uuid
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self.fsuuid = args.fsuuid
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self.type = args.type
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self.lineno = lineno
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self.source_file = ""
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def get_extra_block_count(self, current_blocks):
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"""
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The --size param is reflected in self.size (in kB), and we already
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have current_blocks (1k) blocks, calculate and return the
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number of (1k) blocks we need to add to get to --size, 0 if
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we're already there or beyond.
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"""
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logger.debug("Requested partition size for %s: %d",
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self.mountpoint, self.size)
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if not self.size:
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return 0
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requested_blocks = self.size
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logger.debug("Requested blocks %d, current_blocks %d",
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requested_blocks, current_blocks)
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if requested_blocks > current_blocks:
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return requested_blocks - current_blocks
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else:
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return 0
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def get_rootfs_size(self, actual_rootfs_size=0):
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"""
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Calculate the required size of rootfs taking into consideration
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--size/--fixed-size flags as well as overhead and extra space, as
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specified in kickstart file. Raises an error if the
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`actual_rootfs_size` is larger than fixed-size rootfs.
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"""
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if self.fixed_size:
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rootfs_size = self.fixed_size
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if actual_rootfs_size > rootfs_size:
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raise WicError("Actual rootfs size (%d kB) is larger than "
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"allowed size %d kB" %
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(actual_rootfs_size, rootfs_size))
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else:
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extra_blocks = self.get_extra_block_count(actual_rootfs_size)
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if extra_blocks < self.extra_space:
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extra_blocks = self.extra_space
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rootfs_size = actual_rootfs_size + extra_blocks
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rootfs_size *= self.overhead_factor
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logger.debug("Added %d extra blocks to %s to get to %d total blocks",
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extra_blocks, self.mountpoint, rootfs_size)
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return rootfs_size
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@property
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def disk_size(self):
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"""
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Obtain on-disk size of partition taking into consideration
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--size/--fixed-size options.
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"""
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return self.fixed_size if self.fixed_size else self.size
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def prepare(self, creator, cr_workdir, oe_builddir, rootfs_dir,
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bootimg_dir, kernel_dir, native_sysroot):
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"""
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Prepare content for individual partitions, depending on
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partition command parameters.
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"""
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if not self.source:
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if not self.size and not self.fixed_size:
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raise WicError("The %s partition has a size of zero. Please "
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"specify a non-zero --size/--fixed-size for that "
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"partition." % self.mountpoint)
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if self.fstype == "swap":
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self.prepare_swap_partition(cr_workdir, oe_builddir,
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native_sysroot)
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self.source_file = "%s/fs.%s" % (cr_workdir, self.fstype)
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else:
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if self.fstype == 'squashfs':
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raise WicError("It's not possible to create empty squashfs "
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"partition '%s'" % (self.mountpoint))
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rootfs = "%s/fs_%s.%s.%s" % (cr_workdir, self.label,
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self.lineno, self.fstype)
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if os.path.isfile(rootfs):
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os.remove(rootfs)
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prefix = "ext" if self.fstype.startswith("ext") else self.fstype
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method = getattr(self, "prepare_empty_partition_" + prefix)
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method(rootfs, oe_builddir, native_sysroot)
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self.source_file = rootfs
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return
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plugins = PluginMgr.get_plugins('source')
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if self.source not in plugins:
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raise WicError("The '%s' --source specified for %s doesn't exist.\n\t"
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"See 'wic list source-plugins' for a list of available"
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" --sources.\n\tSee 'wic help source-plugins' for "
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"details on adding a new source plugin." %
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(self.source, self.mountpoint))
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srcparams_dict = {}
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if self.sourceparams:
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# Split sourceparams string of the form key1=val1[,key2=val2,...]
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# into a dict. Also accepts valueless keys i.e. without =
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splitted = self.sourceparams.split(',')
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srcparams_dict = dict(par.split('=', 1) for par in splitted if par)
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plugin = PluginMgr.get_plugins('source')[self.source]
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plugin.do_configure_partition(self, srcparams_dict, creator,
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cr_workdir, oe_builddir, bootimg_dir,
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kernel_dir, native_sysroot)
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plugin.do_stage_partition(self, srcparams_dict, creator,
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cr_workdir, oe_builddir, bootimg_dir,
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kernel_dir, native_sysroot)
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plugin.do_prepare_partition(self, srcparams_dict, creator,
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cr_workdir, oe_builddir, bootimg_dir,
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kernel_dir, rootfs_dir, native_sysroot)
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plugin.do_post_partition(self, srcparams_dict, creator,
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cr_workdir, oe_builddir, bootimg_dir,
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kernel_dir, rootfs_dir, native_sysroot)
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# further processing required Partition.size to be an integer, make
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# sure that it is one
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if not isinstance(self.size, int):
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raise WicError("Partition %s internal size is not an integer. "
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"This a bug in source plugin %s and needs to be fixed." %
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(self.mountpoint, self.source))
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if self.fixed_size and self.size > self.fixed_size:
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raise WicError("File system image of partition %s is "
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"larger (%d kB) than its allowed size %d kB" %
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(self.mountpoint, self.size, self.fixed_size))
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def prepare_rootfs(self, cr_workdir, oe_builddir, rootfs_dir,
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native_sysroot, real_rootfs = True):
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"""
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Prepare content for a rootfs partition i.e. create a partition
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and fill it from a /rootfs dir.
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Currently handles ext2/3/4, btrfs, vfat and squashfs.
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"""
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p_prefix = os.environ.get("PSEUDO_PREFIX", "%s/usr" % native_sysroot)
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p_localstatedir = os.environ.get("PSEUDO_LOCALSTATEDIR",
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"%s/../pseudo" % rootfs_dir)
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p_passwd = os.environ.get("PSEUDO_PASSWD", rootfs_dir)
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p_nosymlinkexp = os.environ.get("PSEUDO_NOSYMLINKEXP", "1")
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pseudo = "export PSEUDO_PREFIX=%s;" % p_prefix
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pseudo += "export PSEUDO_LOCALSTATEDIR=%s;" % p_localstatedir
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pseudo += "export PSEUDO_PASSWD=%s;" % p_passwd
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pseudo += "export PSEUDO_NOSYMLINKEXP=%s;" % p_nosymlinkexp
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pseudo += "%s " % get_bitbake_var("FAKEROOTCMD")
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rootfs = "%s/rootfs_%s.%s.%s" % (cr_workdir, self.label,
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self.lineno, self.fstype)
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if os.path.isfile(rootfs):
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os.remove(rootfs)
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# Get rootfs size from bitbake variable if it's not set in .ks file
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if not self.size and real_rootfs:
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# Bitbake variable ROOTFS_SIZE is calculated in
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# Image._get_rootfs_size method from meta/lib/oe/image.py
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# using IMAGE_ROOTFS_SIZE, IMAGE_ROOTFS_ALIGNMENT,
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# IMAGE_OVERHEAD_FACTOR and IMAGE_ROOTFS_EXTRA_SPACE
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rsize_bb = get_bitbake_var('ROOTFS_SIZE')
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if rsize_bb:
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logger.warning('overhead-factor was specified, but size was not,'
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' so bitbake variables will be used for the size.'
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' In this case both IMAGE_OVERHEAD_FACTOR and '
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'--overhead-factor will be applied')
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self.size = int(round(float(rsize_bb)))
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prefix = "ext" if self.fstype.startswith("ext") else self.fstype
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method = getattr(self, "prepare_rootfs_" + prefix)
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method(rootfs, oe_builddir, rootfs_dir, native_sysroot, pseudo)
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self.source_file = rootfs
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# get the rootfs size in the right units for kickstart (kB)
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du_cmd = "du -Lbks %s" % rootfs
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out = exec_cmd(du_cmd)
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self.size = int(out.split()[0])
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def prepare_rootfs_ext(self, rootfs, oe_builddir, rootfs_dir,
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native_sysroot, pseudo):
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"""
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Prepare content for an ext2/3/4 rootfs partition.
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"""
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du_cmd = "du -ks %s" % rootfs_dir
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out = exec_cmd(du_cmd)
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actual_rootfs_size = int(out.split()[0])
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rootfs_size = self.get_rootfs_size(actual_rootfs_size)
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with open(rootfs, 'w') as sparse:
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os.ftruncate(sparse.fileno(), rootfs_size * 1024)
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extraopts = self.mkfs_extraopts or "-F -i 8192"
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label_str = ""
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if self.label:
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label_str = "-L %s" % self.label
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mkfs_cmd = "mkfs.%s %s %s %s -U %s -d %s" % \
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(self.fstype, extraopts, rootfs, label_str, self.fsuuid, rootfs_dir)
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exec_native_cmd(mkfs_cmd, native_sysroot, pseudo=pseudo)
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mkfs_cmd = "fsck.%s -pvfD %s" % (self.fstype, rootfs)
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exec_native_cmd(mkfs_cmd, native_sysroot, pseudo=pseudo)
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def prepare_rootfs_btrfs(self, rootfs, oe_builddir, rootfs_dir,
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native_sysroot, pseudo):
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"""
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Prepare content for a btrfs rootfs partition.
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"""
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du_cmd = "du -ks %s" % rootfs_dir
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out = exec_cmd(du_cmd)
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actual_rootfs_size = int(out.split()[0])
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rootfs_size = self.get_rootfs_size(actual_rootfs_size)
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with open(rootfs, 'w') as sparse:
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os.ftruncate(sparse.fileno(), rootfs_size * 1024)
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label_str = ""
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if self.label:
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label_str = "-L %s" % self.label
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mkfs_cmd = "mkfs.%s -b %d -r %s %s %s -U %s %s" % \
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(self.fstype, rootfs_size * 1024, rootfs_dir, label_str,
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self.mkfs_extraopts, self.fsuuid, rootfs)
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exec_native_cmd(mkfs_cmd, native_sysroot, pseudo=pseudo)
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def prepare_rootfs_msdos(self, rootfs, oe_builddir, rootfs_dir,
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native_sysroot, pseudo):
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"""
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Prepare content for a msdos/vfat rootfs partition.
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"""
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du_cmd = "du -bks %s" % rootfs_dir
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out = exec_cmd(du_cmd)
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blocks = int(out.split()[0])
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rootfs_size = self.get_rootfs_size(blocks)
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label_str = "-n boot"
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if self.label:
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label_str = "-n %s" % self.label
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size_str = ""
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if self.fstype == 'msdos':
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size_str = "-F 16" # FAT 16
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extraopts = self.mkfs_extraopts or '-S 512'
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dosfs_cmd = "mkdosfs %s -i %s %s %s -C %s %d" % \
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(label_str, self.fsuuid, size_str, extraopts, rootfs,
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rootfs_size)
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exec_native_cmd(dosfs_cmd, native_sysroot)
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mcopy_cmd = "mcopy -i %s -s %s/* ::/" % (rootfs, rootfs_dir)
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exec_native_cmd(mcopy_cmd, native_sysroot)
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chmod_cmd = "chmod 644 %s" % rootfs
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exec_cmd(chmod_cmd)
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prepare_rootfs_vfat = prepare_rootfs_msdos
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def prepare_rootfs_squashfs(self, rootfs, oe_builddir, rootfs_dir,
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native_sysroot, pseudo):
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"""
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Prepare content for a squashfs rootfs partition.
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"""
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extraopts = self.mkfs_extraopts or '-noappend'
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squashfs_cmd = "mksquashfs %s %s %s" % \
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(rootfs_dir, rootfs, extraopts)
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exec_native_cmd(squashfs_cmd, native_sysroot, pseudo=pseudo)
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def prepare_empty_partition_ext(self, rootfs, oe_builddir,
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native_sysroot):
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"""
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Prepare an empty ext2/3/4 partition.
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"""
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size = self.disk_size
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with open(rootfs, 'w') as sparse:
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os.ftruncate(sparse.fileno(), size * 1024)
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extraopts = self.mkfs_extraopts or "-i 8192"
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label_str = ""
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if self.label:
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label_str = "-L %s" % self.label
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mkfs_cmd = "mkfs.%s -F %s %s -U %s %s" % \
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(self.fstype, extraopts, label_str, self.fsuuid, rootfs)
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exec_native_cmd(mkfs_cmd, native_sysroot)
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def prepare_empty_partition_btrfs(self, rootfs, oe_builddir,
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native_sysroot):
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"""
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Prepare an empty btrfs partition.
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"""
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size = self.disk_size
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with open(rootfs, 'w') as sparse:
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os.ftruncate(sparse.fileno(), size * 1024)
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label_str = ""
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if self.label:
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label_str = "-L %s" % self.label
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mkfs_cmd = "mkfs.%s -b %d %s -U %s %s %s" % \
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(self.fstype, self.size * 1024, label_str, self.fsuuid,
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self.mkfs_extraopts, rootfs)
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exec_native_cmd(mkfs_cmd, native_sysroot)
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def prepare_empty_partition_msdos(self, rootfs, oe_builddir,
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native_sysroot):
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"""
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Prepare an empty vfat partition.
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"""
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blocks = self.disk_size
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label_str = "-n boot"
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if self.label:
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label_str = "-n %s" % self.label
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size_str = ""
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if self.fstype == 'msdos':
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size_str = "-F 16" # FAT 16
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extraopts = self.mkfs_extraopts or '-S 512'
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dosfs_cmd = "mkdosfs %s -i %s %s %s -C %s %d" % \
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(label_str, self.fsuuid, extraopts, size_str, rootfs,
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blocks)
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exec_native_cmd(dosfs_cmd, native_sysroot)
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chmod_cmd = "chmod 644 %s" % rootfs
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exec_cmd(chmod_cmd)
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prepare_empty_partition_vfat = prepare_empty_partition_msdos
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def prepare_swap_partition(self, cr_workdir, oe_builddir, native_sysroot):
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"""
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Prepare a swap partition.
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"""
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path = "%s/fs.%s" % (cr_workdir, self.fstype)
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with open(path, 'w') as sparse:
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os.ftruncate(sparse.fileno(), self.size * 1024)
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|
|
|
label_str = ""
|
|
if self.label:
|
|
label_str = "-L %s" % self.label
|
|
|
|
mkswap_cmd = "mkswap %s -U %s %s" % (label_str, self.fsuuid, path)
|
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exec_native_cmd(mkswap_cmd, native_sysroot)
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