def _get_target_offset(self):
if self.target_table_type == 'dasd':
blocks = self._read_dasd_disk_geometry('blocks per track')
bash_command = [
'fdasd', '-f', '-s', '-p', self.target_device,
'|', 'head', '-n', '1', '|', 'tr', '-s', '" "'
]
fdasd_call = Command.run(
['bash', '-c', ' '.join(bash_command)]
)
fdasd_output = fdasd_call.output
try:
start_track = int(fdasd_output.split(' ')[2].lstrip())
except Exception:
raise KiwiDiskGeometryError(
'unknown partition format: %s' % fdasd_output
)
return start_track * blocks
else:
blocks = self._read_msdos_disk_geometry('blocks per track')
parted_call = Command.run(
['parted', '-m', self.target_device, 'unit', 's', 'print']
)
parted_output = parted_call.output.lstrip()
first_partition_format = re.search('1:(.*?)s', parted_output)
if not first_partition_format:
raise KiwiDiskGeometryError(
'unknown partition format: %s' % parted_output
)
start_track = int(first_partition_format.group(1))
return start_track * blocks
def _read_dasd_disk_geometry(self, value):
fdasd = ['fdasd', '-f', '-p', self.target_device]
bash_command = fdasd + ['|', 'grep', '"' + value + '"']
fdasd_call = Command.run(['bash', '-c', ' '.join(bash_command)])
fdasd_output = fdasd_call.output
try:
return int(fdasd_output.split(':')[1].lstrip())
except Exception:
raise KiwiDiskGeometryError(
'unknown format for disk geometry: %s' % fdasd_output)
def _read_msdos_disk_geometry(self, value):
sfdisk_call = Command.run(['sfdisk', '-g', self.target_device])
sfdisk_output = sfdisk_call.output.lstrip()
geometry_format = re.search(
'/dev.*: (.*) cylinders, (.*) heads, (.*) sectors/track',
sfdisk_output)
if not geometry_format:
raise KiwiDiskGeometryError('unknown format for geometry: %s' %
sfdisk_output)
result = {
'cylinders': geometry_format.group(1),
'tracks per cylinder': geometry_format.group(2),
'blocks per track': geometry_format.group(3)
}
if value in result:
return int(result[value])