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# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import fixtures
import logging
import os
import subprocess
from unittest import mock
import diskimage_builder.block_device.tests.test_base as tb
from diskimage_builder.block_device.level0.localloop import image_create
from diskimage_builder.block_device.level1.mbr import MBR
logger = logging.getLogger(__name__)
class TestMBR(tb.TestBase):
disk_size_10M = 10 * 1024 * 1024
disk_size_1G = 1024 * 1024 * 1024
def _get_path_for_partx(self):
"""Searches and sets the path for partx
Because different distributions store the partx binary
at different places, there is the need to look for it.
"""
dirs = ["/bin", "/usr/bin", "/sbin", "/usr/sbin"]
for d in dirs:
if os.path.exists(os.path.join(d, "partx")):
return os.path.join(d, "partx")
return
# If not found, try without path.
return "partx"
def setUp(self):
super(TestMBR, self).setUp()
self.tmp_dir = fixtures.TempDir()
self.useFixture(self.tmp_dir)
self.image_path = os.path.join(self.tmp_dir.path, "image.raw")
image_create(self.image_path, TestMBR.disk_size_1G)
logger.debug("Temp image is %s", self.image_path)
self.partx_args = [self._get_path_for_partx(), "--raw",
"--output", "NR,START,END,TYPE,FLAGS,SCHEME",
"-g", "-b", "-", self.image_path]
def _run_partx(self, image_path):
logger.info("Running command: %s", self.partx_args)
return subprocess.check_output(self.partx_args).decode("ascii")
@mock.patch('os.fsync', wraps=os.fsync)
def test_one_ext_partition(self, mock_os_fsync):
"""Creates one partition and check correctness with partx."""
with MBR(self.image_path, TestMBR.disk_size_1G, 1024 * 1024) as mbr:
mbr.add_partition(False, False, TestMBR.disk_size_10M, 0x83)
# the exit handler of MBR should have synced the raw device
# before exit
mock_os_fsync.assert_called()
output = self._run_partx(self.image_path)
self.assertEqual(
"1 2048 2097151 0xf 0x0 dos\n"
"5 4096 24575 0x83 0x0 dos\n", output)
def test_zero_partitions(self):
"""Creates no partition and check correctness with partx."""
with MBR(self.image_path, TestMBR.disk_size_1G, 1024 * 1024):
pass
output = self._run_partx(self.image_path)
self.assertEqual("", output)
def test_many_ext_partitions(self):
"""Creates many partition and check correctness with partx."""
with MBR(self.image_path, TestMBR.disk_size_1G, 1024 * 1024) as mbr:
for nr in range(0, 64):
mbr.add_partition(False, False, TestMBR.disk_size_10M, 0x83)
output = self._run_partx(self.image_path)
lines = output.split("\n")
self.assertEqual(66, len(lines))
self.assertEqual(
"1 2048 2097151 0xf 0x0 dos", lines[0])
start_block = 4096
end_block = start_block + TestMBR.disk_size_10M / 512 - 1
for nr in range(1, 65):
fields = lines[nr].split(" ")
self.assertEqual(6, len(fields))
self.assertEqual(nr + 4, int(fields[0]))
self.assertEqual(start_block, int(fields[1]))
self.assertEqual(end_block, int(fields[2]))
self.assertEqual("0x83", fields[3])
self.assertEqual("0x0", fields[4])
self.assertEqual("dos", fields[5])
start_block += 22528
end_block = start_block + TestMBR.disk_size_10M / 512 - 1
def test_one_pri_partition(self):
"""Creates one primary partition and check correctness with partx."""
with MBR(self.image_path, TestMBR.disk_size_1G, 1024 * 1024) as mbr:
mbr.add_partition(True, False, TestMBR.disk_size_10M, 0x83)
output = self._run_partx(self.image_path)
self.assertEqual(
"1 2048 22527 0x83 0x0 dos\n", output)
def test_three_pri_partition(self):
"""Creates three primary partition and check correctness with partx."""
with MBR(self.image_path, TestMBR.disk_size_1G, 1024 * 1024) as mbr:
for _ in range(3):
mbr.add_partition(True, False, TestMBR.disk_size_10M, 0x83)
output = self._run_partx(self.image_path)
self.assertEqual(
"1 2048 22527 0x83 0x0 dos\n"
"2 22528 43007 0x83 0x0 dos\n"
"3 43008 63487 0x83 0x0 dos\n", output)
def test_many_pri_and_ext_partition(self):
"""Creates many primary and extended partitions."""
with MBR(self.image_path, TestMBR.disk_size_1G, 1024 * 1024) as mbr:
# Create three primary partitions
for _ in range(3):
mbr.add_partition(True, False, TestMBR.disk_size_10M, 0x83)
for _ in range(7):
mbr.add_partition(False, False, TestMBR.disk_size_10M, 0x83)
output = self._run_partx(self.image_path)
self.assertEqual(
"1 2048 22527 0x83 0x0 dos\n" # Primary 1
"2 22528 43007 0x83 0x0 dos\n" # Primary 2
"3 43008 63487 0x83 0x0 dos\n" # Primary 3
"4 63488 2097151 0xf 0x0 dos\n" # Extended
"5 65536 86015 0x83 0x0 dos\n" # Extended Partition 1
"6 88064 108543 0x83 0x0 dos\n" # Extended Partition 2
"7 110592 131071 0x83 0x0 dos\n" # ...
"8 133120 153599 0x83 0x0 dos\n"
"9 155648 176127 0x83 0x0 dos\n"
"10 178176 198655 0x83 0x0 dos\n"
"11 200704 221183 0x83 0x0 dos\n", output)
def test_pri_fat32_lba_partition(self):
"""Creates a partition with a non-default 'type' and verifies."""
with MBR(self.image_path, TestMBR.disk_size_1G, 1024 * 1024) as mbr:
mbr.add_partition(True, False, TestMBR.disk_size_10M, 0x0c)
output = self._run_partx(self.image_path)
self.assertEqual(
"1 2048 22527 0xc 0x0 dos\n", output)
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