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Add tests for partitioned disk images

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The setup for this is a bit complex, so it really ends up testing things
twice.
This commit is contained in:
Brian C. Lane 2018-11-08 15:48:53 -08:00
parent d69f01d4a8
commit fb4e6f2588
2 changed files with 115 additions and 1 deletions
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1
Dockerfile.test
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@ -14,6 +14,7 @@ RUN dnf -y install \
python3-nose \
python3-pocketlint \
python3-pylint \
python3-pyparted \
python3-pytoml \
python3-semantic_version \
python3-sphinx \

115
tests/pylorax/test_imgutils.py
View File

@ -14,7 +14,9 @@
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
import glob
import os
import parted
import tempfile
import unittest
@ -23,6 +25,7 @@ from pylorax.executils import runcmd
from pylorax.imgutils import mkcpio, mktar, mksquashfs, mksparse, mkqcow2, loop_attach, loop_detach
from pylorax.imgutils import get_loop_name, LoopDev, dm_attach, dm_detach, DMDev, Mount
from pylorax.imgutils import mkdosimg, mkext4img, mkbtrfsimg, mkhfsimg, default_image_name
from pylorax.imgutils import mount, umount, kpartx_disk_img, PartitionMount, mkfsimage_from_disk
from pylorax.sysutils import joinpaths
def mkfakerootdir(rootdir):
@ -42,6 +45,76 @@ def mkfakerootdir(rootdir):
os.makedirs(joinpaths(rootdir, os.path.dirname(f)))
open(joinpaths(rootdir, f), "w").write("I AM FAKE FILE %s" % f.upper())
def mkfakebootdir(bootdir):
"""Populate a fake /boot directory with a kernel and initrd
:param bootdir: An existing directory to create files/dirs under
:type bootdir: str
"""
open(joinpaths(bootdir, "vmlinuz-4.18.13-200.fc28.x86_64"), "w").write("I AM A FAKE KERNEL")
open(joinpaths(bootdir, "initramfs-4.18.13-200.fc28.x86_64.img"), "w").write("I AM A FAKE INITRD")
def mkfakediskimg(disk_img):
"""Create a fake partitioned disk image
:param disk_img: Full path to a partitioned disk image
:type disk_img: str
:returns: True if it was successful, False if something went wrong
Include /boot, swap, and / partitions with fake kernel and /etc/passwd
"""
try:
mksparse(disk_img, 42 * 1024**2)
# Make a /boot, / and swap partitions on it
dev = parted.getDevice(disk_img)
disk = parted.freshDisk(dev, "gpt")
# (start, length, flags, name)
for start, length, flags, name in [
( 1024**2, 1024**2, None, "boot"),
(2*1024**2, 2*1024**2, parted.PARTITION_SWAP, "swap"),
(4*1024**2, 38*1024**2, None, "root")]:
geo = parted.Geometry(device=dev, start=start//dev.sectorSize, length=length//dev.sectorSize)
part = parted.Partition(disk=disk, type=parted.PARTITION_NORMAL, geometry=geo)
part.getPedPartition().set_name(name)
disk.addPartition(partition=part)
if flags:
part.setFlag(flags)
disk.commit()
os.sync()
except parted.PartedException:
return False
# Mount the disk's partitions
loop_devs = kpartx_disk_img(disk_img)
try:
# Format the partitions
runcmd(["mkfs.ext4", "/dev/mapper/" + loop_devs[0][0]])
runcmd(["mkswap", "/dev/mapper/" + loop_devs[1][0]])
runcmd(["mkfs.ext4", "/dev/mapper/" + loop_devs[2][0]])
# Mount the boot partition and make a fake kernel and initrd
boot_mnt = mount("/dev/mapper/" + loop_devs[0][0])
try:
mkfakebootdir(boot_mnt)
finally:
umount(boot_mnt)
# Mount the / partition and make a fake / filesystem with /etc/passwd
root_mnt = mount("/dev/mapper/" + loop_devs[2][0])
try:
mkfakerootdir(root_mnt)
finally:
umount(root_mnt)
except Exception:
return False
finally:
# Remove the disk's mounted partitions
runcmd(["kpartx", "-d", "-s", disk_img])
return True
class ImgUtilsTest(unittest.TestCase):
def mkcpio_test(self):
"""Test mkcpio function"""
@ -179,7 +252,8 @@ class ImgUtilsTest(unittest.TestCase):
with tempfile.TemporaryDirectory(prefix="lorax.test.") as work_dir:
with tempfile.NamedTemporaryFile(prefix="lorax.test.disk.") as disk_img:
mkfakerootdir(work_dir)
mkext4img(work_dir, disk_img.name)
graft = {"/etc/yum.repos.d/": "./tests/pylorax/repos/single.repo"}
mkext4img(work_dir, disk_img.name, graft=graft)
self.assertTrue(os.path.exists(disk_img.name))
file_details = get_file_magic(disk_img.name)
self.assertTrue("ext2 filesystem" in file_details, file_details)
@ -212,3 +286,42 @@ class ImgUtilsTest(unittest.TestCase):
filename = default_image_name(compression, "foobar")
self.assertTrue(filename.endswith(suffix))
@unittest.skipUnless(os.geteuid() == 0 and not os.path.exists("/.in-container"), "requires root privileges, and no containers")
def partition_mount_test(self):
"""Test PartitionMount context manager (requires loop)"""
with tempfile.NamedTemporaryFile(prefix="lorax.test.disk.") as disk_img:
self.assertTrue(mkfakediskimg(disk_img.name))
# Make sure it can mount the / with /etc/passwd
with PartitionMount(disk_img.name) as img_mount:
self.assertTrue(img_mount is not None)
self.assertTrue(os.path.isdir(img_mount.mount_dir))
self.assertTrue(os.path.exists(joinpaths(img_mount.mount_dir, "/etc/passwd")))
# Make sure submount works
with PartitionMount(disk_img.name, submount="/a-sub-mount/") as img_mount:
self.assertTrue(img_mount is not None)
self.assertTrue(os.path.isdir(img_mount.mount_dir))
self.assertTrue(os.path.exists(joinpaths(img_mount.mount_dir, "/etc/passwd")))
# Make sure it can mount the /boot partition with a custom mount_ok function
def mount_ok(mount_dir):
kernels = glob.glob(joinpaths(mount_dir, "vmlinuz-*"))
return len(kernels) > 0
with PartitionMount(disk_img.name, mount_ok=mount_ok) as img_mount:
self.assertTrue(img_mount is not None)
self.assertTrue(os.path.isdir(img_mount.mount_dir))
self.assertFalse(os.path.exists(joinpaths(img_mount.mount_dir, "/etc/passwd")))
self.assertTrue(os.path.exists(joinpaths(img_mount.mount_dir, "vmlinuz-4.18.13-200.fc28.x86_64")))
self.assertTrue(os.path.exists(joinpaths(img_mount.mount_dir, "initramfs-4.18.13-200.fc28.x86_64.img")))
@unittest.skipUnless(os.geteuid() == 0 and not os.path.exists("/.in-container"), "requires root privileges, and no containers")
def mkfsimage_from_disk_test(self):
"""Test creating a fsimage from the / partition of a disk image"""
with tempfile.NamedTemporaryFile(prefix="lorax.test.disk.") as disk_img:
self.assertTrue(mkfakediskimg(disk_img.name))
with tempfile.NamedTemporaryFile(prefix="lorax.test.disk.") as fs_img:
mkfsimage_from_disk(disk_img.name, fs_img.name)
self.assertTrue(os.path.exists(fs_img.name))
file_details = get_file_magic(fs_img.name)
self.assertTrue("ext2 filesystem" in file_details, file_details)