376 lines
15 KiB
Python
376 lines
15 KiB
Python
#!/usr/bin/env python -tt
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#
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# Copyright (c) 2009, 2010, 2011 Intel, Inc.
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# Copyright (c) 2007, 2008 Red Hat, Inc.
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# Copyright (c) 2008 Daniel P. Berrange
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# Copyright (c) 2008 David P. Huff
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#
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# This program is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the Free
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# Software Foundation; version 2 of the License
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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# 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., 59
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# Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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import os
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from wic import msger
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from wic.utils import runner
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from wic.utils.errors import ImageError
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from wic.utils.fs_related import *
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from wic.utils.oe.misc import *
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# Overhead of the MBR partitioning scheme (just one sector)
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MBR_OVERHEAD = 1
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# Overhead of the GPT partitioning scheme
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GPT_OVERHEAD = 34
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# Size of a sector in bytes
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SECTOR_SIZE = 512
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class Image:
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"""
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Generic base object for an image.
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An Image is a container for a set of DiskImages and associated
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partitions.
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"""
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def __init__(self):
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self.disks = {}
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self.partitions = []
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self.parted = find_binary_path("parted")
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# Size of a sector used in calculations
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self.sector_size = SECTOR_SIZE
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self._partitions_layed_out = False
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def __add_disk(self, disk_name):
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""" Add a disk 'disk_name' to the internal list of disks. Note,
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'disk_name' is the name of the disk in the target system
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(e.g., sdb). """
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if disk_name in self.disks:
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# We already have this disk
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return
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assert not self._partitions_layed_out
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self.disks[disk_name] = \
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{ 'disk': None, # Disk object
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'numpart': 0, # Number of allocate partitions
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'realpart': 0, # Number of partitions in the partition table
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'partitions': [], # Indexes to self.partitions
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'offset': 0, # Offset of next partition (in sectors)
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# Minimum required disk size to fit all partitions (in bytes)
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'min_size': 0,
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'ptable_format': "msdos" } # Partition table format
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def add_disk(self, disk_name, disk_obj):
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""" Add a disk object which have to be partitioned. More than one disk
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can be added. In case of multiple disks, disk partitions have to be
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added for each disk separately with 'add_partition()". """
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self.__add_disk(disk_name)
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self.disks[disk_name]['disk'] = disk_obj
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def __add_partition(self, part):
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""" This is a helper function for 'add_partition()' which adds a
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partition to the internal list of partitions. """
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assert not self._partitions_layed_out
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self.partitions.append(part)
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self.__add_disk(part['disk_name'])
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def add_partition(self, size, disk_name, mountpoint, source_file = None, fstype = None,
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label=None, fsopts = None, boot = False, align = None, no_table=False,
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part_type = None):
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""" Add the next partition. Prtitions have to be added in the
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first-to-last order. """
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ks_pnum = len(self.partitions)
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# Converting kB to sectors for parted
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size = size * 1024 / self.sector_size
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# We still need partition for "/" or non-subvolume
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if mountpoint == "/" or not fsopts:
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part = { 'ks_pnum' : ks_pnum, # Partition number in the KS file
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'size': size, # In sectors
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'mountpoint': mountpoint, # Mount relative to chroot
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'source_file': source_file, # partition contents
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'fstype': fstype, # Filesystem type
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'fsopts': fsopts, # Filesystem mount options
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'label': label, # Partition label
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'disk_name': disk_name, # physical disk name holding partition
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'device': None, # kpartx device node for partition
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'num': None, # Partition number
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'boot': boot, # Bootable flag
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'align': align, # Partition alignment
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'no_table' : no_table, # Partition does not appear in partition table
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'part_type' : part_type } # Partition type
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self.__add_partition(part)
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def layout_partitions(self, ptable_format = "msdos"):
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""" Layout the partitions, meaning calculate the position of every
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partition on the disk. The 'ptable_format' parameter defines the
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partition table format and may be "msdos". """
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msger.debug("Assigning %s partitions to disks" % ptable_format)
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if ptable_format not in ('msdos', 'gpt'):
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raise ImageError("Unknown partition table format '%s', supported " \
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"formats are: 'msdos'" % ptable_format)
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if self._partitions_layed_out:
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return
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self._partitions_layed_out = True
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# Go through partitions in the order they are added in .ks file
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for n in range(len(self.partitions)):
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p = self.partitions[n]
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if not self.disks.has_key(p['disk_name']):
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raise ImageError("No disk %s for partition %s" \
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% (p['disk_name'], p['mountpoint']))
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if p['part_type']:
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# The --part-type can also be implemented for MBR partitions,
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# in which case it would map to the 1-byte "partition type"
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# filed at offset 3 of the partition entry.
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raise ImageError("setting custom partition type is not " \
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"implemented for msdos partitions")
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# Get the disk where the partition is located
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d = self.disks[p['disk_name']]
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d['numpart'] += 1
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if not p['no_table']:
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d['realpart'] += 1
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d['ptable_format'] = ptable_format
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if d['numpart'] == 1:
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if ptable_format == "msdos":
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overhead = MBR_OVERHEAD
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elif ptable_format == "gpt":
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overhead = GPT_OVERHEAD
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# Skip one sector required for the partitioning scheme overhead
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d['offset'] += overhead
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if d['realpart'] > 3:
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# Reserve a sector for EBR for every logical partition
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# before alignment is performed.
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if ptable_format == "msdos":
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d['offset'] += 1
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if p['align']:
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# If not first partition and we do have alignment set we need
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# to align the partition.
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# FIXME: This leaves a empty spaces to the disk. To fill the
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# gaps we could enlargea the previous partition?
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# Calc how much the alignment is off.
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align_sectors = d['offset'] % (p['align'] * 1024 / self.sector_size)
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if align_sectors:
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# If partition is not aligned as required, we need
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# to move forward to the next alignment point
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align_sectors = (p['align'] * 1024 / self.sector_size) - align_sectors
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msger.debug("Realignment for %s%s with %s sectors, original"
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" offset %s, target alignment is %sK." %
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(p['disk_name'], d['numpart'], align_sectors,
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d['offset'], p['align']))
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# increase the offset so we actually start the partition on right alignment
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d['offset'] += align_sectors
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p['start'] = d['offset']
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d['offset'] += p['size']
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p['type'] = 'primary'
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if not p['no_table']:
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p['num'] = d['realpart']
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else:
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p['num'] = 0
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if d['ptable_format'] == "msdos":
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if d['realpart'] > 3:
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p['type'] = 'logical'
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p['num'] = d['realpart'] + 1
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d['partitions'].append(n)
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msger.debug("Assigned %s to %s%d, sectors range %d-%d size %d "
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"sectors (%d bytes)." \
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% (p['mountpoint'], p['disk_name'], p['num'],
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p['start'], p['start'] + p['size'] - 1,
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p['size'], p['size'] * self.sector_size))
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# Once all the partitions have been layed out, we can calculate the
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# minumim disk sizes.
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for disk_name, d in self.disks.items():
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d['min_size'] = d['offset']
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if d['ptable_format'] == "gpt":
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d['min_size'] += GPT_OVERHEAD
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d['min_size'] *= self.sector_size
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def __run_parted(self, args):
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""" Run parted with arguments specified in the 'args' list. """
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args.insert(0, self.parted)
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msger.debug(args)
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rc, out = runner.runtool(args, catch = 3)
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out = out.strip()
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if out:
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msger.debug('"parted" output: %s' % out)
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if rc != 0:
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# We don't throw exception when return code is not 0, because
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# parted always fails to reload part table with loop devices. This
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# prevents us from distinguishing real errors based on return
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# code.
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msger.error("WARNING: parted returned '%s' instead of 0 (use --debug for details)" % rc)
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def __create_partition(self, device, parttype, fstype, start, size):
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""" Create a partition on an image described by the 'device' object. """
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# Start is included to the size so we need to substract one from the end.
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end = start + size - 1
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msger.debug("Added '%s' partition, sectors %d-%d, size %d sectors" %
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(parttype, start, end, size))
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args = ["-s", device, "unit", "s", "mkpart", parttype]
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if fstype:
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args.extend([fstype])
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args.extend(["%d" % start, "%d" % end])
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return self.__run_parted(args)
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def __format_disks(self):
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self.layout_partitions()
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for dev in self.disks.keys():
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d = self.disks[dev]
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msger.debug("Initializing partition table for %s" % \
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(d['disk'].device))
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self.__run_parted(["-s", d['disk'].device, "mklabel",
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d['ptable_format']])
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msger.debug("Creating partitions")
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for p in self.partitions:
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if p['num'] == 0:
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continue
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d = self.disks[p['disk_name']]
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if d['ptable_format'] == "msdos" and p['num'] == 5:
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# Create an extended partition (note: extended
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# partition is described in MBR and contains all
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# logical partitions). The logical partitions save a
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# sector for an EBR just before the start of a
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# partition. The extended partition must start one
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# sector before the start of the first logical
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# partition. This way the first EBR is inside of the
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# extended partition. Since the extended partitions
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# starts a sector before the first logical partition,
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# add a sector at the back, so that there is enough
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# room for all logical partitions.
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self.__create_partition(d['disk'].device, "extended",
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None, p['start'] - 1,
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d['offset'] - p['start'] + 1)
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if p['fstype'] == "swap":
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parted_fs_type = "linux-swap"
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elif p['fstype'] == "vfat":
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parted_fs_type = "fat32"
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elif p['fstype'] == "msdos":
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parted_fs_type = "fat16"
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else:
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# Type for ext2/ext3/ext4/btrfs
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parted_fs_type = "ext2"
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# Boot ROM of OMAP boards require vfat boot partition to have an
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# even number of sectors.
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if p['mountpoint'] == "/boot" and p['fstype'] in ["vfat", "msdos"] \
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and p['size'] % 2:
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msger.debug("Substracting one sector from '%s' partition to " \
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"get even number of sectors for the partition" % \
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p['mountpoint'])
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p['size'] -= 1
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self.__create_partition(d['disk'].device, p['type'],
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parted_fs_type, p['start'], p['size'])
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if p['boot']:
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flag_name = "boot"
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msger.debug("Set '%s' flag for partition '%s' on disk '%s'" % \
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(flag_name, p['num'], d['disk'].device))
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self.__run_parted(["-s", d['disk'].device, "set",
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"%d" % p['num'], flag_name, "on"])
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# Parted defaults to enabling the lba flag for fat16 partitions,
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# which causes compatibility issues with some firmware (and really
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# isn't necessary).
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if parted_fs_type == "fat16":
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if d['ptable_format'] == 'msdos':
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msger.debug("Disable 'lba' flag for partition '%s' on disk '%s'" % \
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(p['num'], d['disk'].device))
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self.__run_parted(["-s", d['disk'].device, "set",
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"%d" % p['num'], "lba", "off"])
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def cleanup(self):
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if self.disks:
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for dev in self.disks.keys():
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d = self.disks[dev]
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try:
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d['disk'].cleanup()
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except:
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pass
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def __write_partition(self, num, source_file, start, size):
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"""
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Install source_file contents into a partition.
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"""
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if not source_file: # nothing to write
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return
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# Start is included in the size so need to substract one from the end.
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end = start + size - 1
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msger.debug("Installed %s in partition %d, sectors %d-%d, size %d sectors" % (source_file, num, start, end, size))
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dd_cmd = "dd if=%s of=%s bs=%d seek=%d count=%d conv=notrunc" % \
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(source_file, self.image_file, self.sector_size, start, size)
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exec_cmd(dd_cmd)
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def assemble(self, image_file):
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msger.debug("Installing partitions")
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self.image_file = image_file
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for p in self.partitions:
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d = self.disks[p['disk_name']]
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self.__write_partition(p['num'], p['source_file'],
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p['start'], p['size'])
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def create(self):
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for dev in self.disks.keys():
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d = self.disks[dev]
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d['disk'].create()
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self.__format_disks()
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return
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