52faa0e1d9
The MBR Partition Table Entry (PTE) allows one to specify many possible partition types and one of the benefits of this is being able to specify the CHS variant or the LBA variant. By default, LBA only creates partitions of type 0x83 (of course, that's only because the documentation doesn't tell you how to make it do anything else). I will take up Ian's suggestion in patch set 2 for a more rigorous test in an independent patch set. Change-Id: If3068535980eac2e58d4025444c65147a8c7fedc Closes-Bug:#1703352
175 lines
6.5 KiB
Python
175 lines
6.5 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import fixtures
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import logging
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import mock
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import os
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import subprocess
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import diskimage_builder.block_device.tests.test_base as tb
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from diskimage_builder.block_device.level0.localloop import image_create
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from diskimage_builder.block_device.level1.mbr import MBR
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logger = logging.getLogger(__name__)
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class TestMBR(tb.TestBase):
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disk_size_10M = 10 * 1024 * 1024
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disk_size_1G = 1024 * 1024 * 1024
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def _get_path_for_partx(self):
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"""Searches and sets the path for partx
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Because different distributions store the partx binary
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at different places, there is the need to look for it.
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"""
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dirs = ["/bin", "/usr/bin", "/sbin", "/usr/sbin"]
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for d in dirs:
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if os.path.exists(os.path.join(d, "partx")):
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return os.path.join(d, "partx")
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return
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# If not found, try without path.
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return "partx"
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def setUp(self):
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super(TestMBR, self).setUp()
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self.tmp_dir = fixtures.TempDir()
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self.useFixture(self.tmp_dir)
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self.image_path = os.path.join(self.tmp_dir.path, "image.raw")
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image_create(self.image_path, TestMBR.disk_size_1G)
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logger.debug("Temp image is %s", self.image_path)
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self.partx_args = [self._get_path_for_partx(), "--raw",
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"--output", "NR,START,END,TYPE,FLAGS,SCHEME",
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"-g", "-b", "-", self.image_path]
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def _run_partx(self, image_path):
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logger.info("Running command: %s", self.partx_args)
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return subprocess.check_output(self.partx_args).decode("ascii")
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@mock.patch('os.fsync', wraps=os.fsync)
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def test_one_ext_partition(self, mock_os_fsync):
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"""Creates one partition and check correctness with partx."""
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with MBR(self.image_path, TestMBR.disk_size_1G, 1024 * 1024) as mbr:
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mbr.add_partition(False, False, TestMBR.disk_size_10M, 0x83)
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# the exit handler of MBR should have synced the raw device
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# before exit
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mock_os_fsync.assert_called()
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output = self._run_partx(self.image_path)
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self.assertEqual(
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"1 2048 2097151 0xf 0x0 dos\n"
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"5 4096 24575 0x83 0x0 dos\n", output)
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def test_zero_partitions(self):
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"""Creates no partition and check correctness with partx."""
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with MBR(self.image_path, TestMBR.disk_size_1G, 1024 * 1024):
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pass
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output = self._run_partx(self.image_path)
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self.assertEqual("", output)
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def test_many_ext_partitions(self):
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"""Creates many partition and check correctness with partx."""
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with MBR(self.image_path, TestMBR.disk_size_1G, 1024 * 1024) as mbr:
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for nr in range(0, 64):
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mbr.add_partition(False, False, TestMBR.disk_size_10M, 0x83)
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output = self._run_partx(self.image_path)
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lines = output.split("\n")
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self.assertEqual(66, len(lines))
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self.assertEqual(
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"1 2048 2097151 0xf 0x0 dos", lines[0])
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start_block = 4096
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end_block = start_block + TestMBR.disk_size_10M / 512 - 1
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for nr in range(1, 65):
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fields = lines[nr].split(" ")
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self.assertEqual(6, len(fields))
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self.assertEqual(nr + 4, int(fields[0]))
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self.assertEqual(start_block, int(fields[1]))
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self.assertEqual(end_block, int(fields[2]))
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self.assertEqual("0x83", fields[3])
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self.assertEqual("0x0", fields[4])
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self.assertEqual("dos", fields[5])
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start_block += 22528
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end_block = start_block + TestMBR.disk_size_10M / 512 - 1
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def test_one_pri_partition(self):
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"""Creates one primary partition and check correctness with partx."""
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with MBR(self.image_path, TestMBR.disk_size_1G, 1024 * 1024) as mbr:
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mbr.add_partition(True, False, TestMBR.disk_size_10M, 0x83)
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output = self._run_partx(self.image_path)
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self.assertEqual(
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"1 2048 22527 0x83 0x0 dos\n", output)
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def test_three_pri_partition(self):
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"""Creates three primary partition and check correctness with partx."""
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with MBR(self.image_path, TestMBR.disk_size_1G, 1024 * 1024) as mbr:
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for _ in range(3):
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mbr.add_partition(True, False, TestMBR.disk_size_10M, 0x83)
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output = self._run_partx(self.image_path)
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self.assertEqual(
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"1 2048 22527 0x83 0x0 dos\n"
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"2 22528 43007 0x83 0x0 dos\n"
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"3 43008 63487 0x83 0x0 dos\n", output)
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def test_many_pri_and_ext_partition(self):
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"""Creates many primary and extended partitions."""
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with MBR(self.image_path, TestMBR.disk_size_1G, 1024 * 1024) as mbr:
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# Create three primary partitions
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for _ in range(3):
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mbr.add_partition(True, False, TestMBR.disk_size_10M, 0x83)
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for _ in range(7):
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mbr.add_partition(False, False, TestMBR.disk_size_10M, 0x83)
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output = self._run_partx(self.image_path)
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self.assertEqual(
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"1 2048 22527 0x83 0x0 dos\n" # Primary 1
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"2 22528 43007 0x83 0x0 dos\n" # Primary 2
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"3 43008 63487 0x83 0x0 dos\n" # Primary 3
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"4 63488 2097151 0xf 0x0 dos\n" # Extended
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"5 65536 86015 0x83 0x0 dos\n" # Extended Partition 1
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"6 88064 108543 0x83 0x0 dos\n" # Extended Partition 2
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"7 110592 131071 0x83 0x0 dos\n" # ...
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"8 133120 153599 0x83 0x0 dos\n"
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"9 155648 176127 0x83 0x0 dos\n"
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"10 178176 198655 0x83 0x0 dos\n"
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"11 200704 221183 0x83 0x0 dos\n", output)
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def test_pri_fat32_lba_partition(self):
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"""Creates a partition with a non-default 'type' and verifies."""
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with MBR(self.image_path, TestMBR.disk_size_1G, 1024 * 1024) as mbr:
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mbr.add_partition(True, False, TestMBR.disk_size_10M, 0x0c)
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output = self._run_partx(self.image_path)
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self.assertEqual(
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"1 2048 22527 0xc 0x0 dos\n", output)
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