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Diffstat (limited to 'extensions/partitioning.py')
| -rw-r--r-- | extensions/partitioning.py | 163 |
1 files changed, 0 insertions, 163 deletions
diff --git a/extensions/partitioning.py b/extensions/partitioning.py deleted file mode 100644 index 2a8de058..00000000 --- a/extensions/partitioning.py +++ /dev/null @@ -1,163 +0,0 @@ -#!/usr/bin/python2 -# Copyright (C) 2015 Codethink Limited -# -# This program is free software; you can redistribute it and/or modify -# it under the terms of the GNU General Public License as published by -# the Free Software Foundation; version 2 of the License. -# -# 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, see <http://www.gnu.org/licenses/>. - - -"""A module providing Baserock-specific partitioning functions""" - -import os -import pyfdisk -import re -import subprocess -import writeexts - -def do_partitioning(location, disk_size, temp_root, part_spec): - '''Perform partitioning - - Perform partitioning using the pyfdisk.py module. Documentation - for this, and guidance on how to create a partition specification can - be found in extensions/pyfdisk.README - - This function also validates essential parts of the partition layout - - Args: - location: Path to the target device or image - temp_root: Location of the unpacked Baserock rootfs - part_spec: Path to a YAML formatted partition specification - Returns: - A pyfdisk.py Device object - Raises: - writeexts.ExtensionError - ''' - # Create partition table and filesystems - try: - dev = pyfdisk.load_yaml(location, disk_size, part_spec) - writeexts.Extension.status(msg='Loaded partition specification: %s' % - part_spec) - - # FIXME: GPT currently not fully supported due to missing tools - if dev.partition_table_format.lower() == 'gpt': - writeexts.Extension.status(msg='WARNING: GPT partition tables ' - 'are not currently supported, ' - 'when using the extlinux ' - 'bootloader') - - writeexts.Extension.status(msg='Summary:\n' + str(dev.partitionlist)) - writeexts.Extension.status(msg='Writing partition table') - dev.commit() - dev.create_filesystems(skip=('/')) - except (pyfdisk.PartitioningError, pyfdisk.FdiskError) as e: - raise writeexts.ExtensionError(e.msg) - - mountpoints = set(part.mountpoint for part in dev.partitionlist - if hasattr(part, 'mountpoint')) - if '/' not in mountpoints: - raise writeexts.ExtensionError('No partition with root ' - 'mountpoint, please specify a ' - 'partition with \'mountpoint: /\' ' - 'in the partition specification') - - mounted_partitions = set(part for part in dev.partitionlist - if hasattr(part, 'mountpoint')) - - for part in mounted_partitions: - if not hasattr(part, 'filesystem'): - raise writeexts.ExtensionError('Cannot mount a partition ' - 'without filesystem, please specify one ' - 'for \'%s\' partition in the partition ' - 'specification' % part.mountpoint) - if part.mountpoint == '/': - # Check that bootable flag is set for MBR devices - if (hasattr(part, 'boot') - and str(part.boot).lower() not in ('yes', 'true') - and dev.partition_table_format.lower() == 'mbr'): - writeexts.Extension.status(msg='WARNING: Boot partition ' - 'needs bootable flag set to ' - 'boot with extlinux/syslinux') - - return dev - -def process_raw_files(dev, temp_root): - if hasattr(dev, 'raw_files'): - write_raw_files(dev.location, temp_root, dev) - for part in dev.partitionlist: - if hasattr(part, 'raw_files'): - # dd seek=n is used, which skips n blocks before writing, - # so we must skip n-1 sectors before writing in order to - # start writing files to the first block of the partition - write_raw_files(dev.location, temp_root, part, - (part.extent.start - 1) * dev.sector_size) - -def write_raw_files(location, temp_root, dev_or_part, start_offset=0): - '''Write files with `dd`''' - offset = 0 - for raw_args in dev_or_part.raw_files: - r = RawFile(temp_root, start_offset, offset, **raw_args) - offset = r.next_offset - r.dd(location) - - -class RawFile(object): - '''A class to hold information about a raw file to write to a device''' - - def __init__(self, source_root, - start_offset=0, wr_offset=0, - sector_size=512, **kwargs): - '''Initialisation function - - Args: - source_root: Base path for filenames - wr_offset: Offset to write to (and offset per-file offsets by) - sector_size: Device sector size (default: 512) - **kwargs: - file: A path to the file to write (combined with source_root) - offset_sectors: An offset to write to in sectors (optional) - offset_bytes: An offset to write to in bytes (optional) - ''' - if 'file' not in kwargs: - raise writeexts.ExtensionError('Missing file name or path') - self.path = os.path.join(source_root, - re.sub('^/', '', kwargs['file'])) - - if not os.path.exists(self.path): - raise writeexts.ExtensionError('File not found: %s' % self.path) - elif os.path.isdir(self.path): - raise writeexts.ExtensionError('Can only dd regular files') - else: - self.size = os.stat(self.path).st_size - - self.offset = start_offset - if 'offset_bytes' in kwargs: - self.offset += pyfdisk.human_size(kwargs['offset_bytes']) - elif 'offset_sectors' in kwargs: - self.offset += kwargs['offset_sectors'] * sector_size - else: - self.offset += wr_offset - - self.skip = pyfdisk.human_size(kwargs.get('skip_bytes', 0)) - self.count = pyfdisk.human_size(kwargs.get('count_bytes', self.size)) - - # Offset of the first free byte after this file (first byte of next) - self.next_offset = self.size + self.offset - - def dd(self, location): - writeexts.Extension.status(msg='Writing %s at %d bytes' % - (self.path, self.offset)) - subprocess.check_call(['dd', 'if=%s' % self.path, - 'of=%s' % location, 'bs=1', - 'seek=%d' % self.offset, - 'skip=%d' % self.skip, - 'count=%d' % self.count, - 'conv=notrunc']) - subprocess.check_call('sync') |