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import unittest
import os
import subprocess
def makeLoopDev(device_name, file_name):
proc = subprocess.Popen(["dd", "if=/dev/zero", "of=%s" % file_name,
"bs=1024", "count=102400"],
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
while True:
proc.communicate()
if proc.returncode is not None:
rc = proc.returncode
break
if rc:
raise OSError, "dd failed creating the file %s" % file_name
proc = subprocess.Popen(["losetup", device_name, file_name],
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
while True:
proc.communicate()
if proc.returncode is not None:
rc = proc.returncode
break
if rc:
raise OSError, "losetup failed setting up the loop device %s" % device_name
def removeLoopDev(device_name, file_name):
proc = subprocess.Popen(["losetup", "-d", device_name],
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
while True:
proc.communicate()
if proc.returncode is not None:
rc = proc.returncode
break
if rc:
raise OSError, "losetup failed removing the loop device %s" % device_name
os.unlink(file_name)
class DevicelibsTestCase(unittest.TestCase):
_LOOP_DEVICES = (("/dev/loop0", "/tmp/test-virtdev0"),
("/dev/loop1", "/tmp/test-virtdev1"))
((_LOOP_DEV0, _LOOP_FILE0), (_LOOP_DEV1, _LOOP_FILE1)) = _LOOP_DEVICES
def setUp(self):
for dev, file in self._LOOP_DEVICES:
makeLoopDev(dev, file)
def tearDown(self):
for dev, file in self._LOOP_DEVICES:
removeLoopDev(dev, file)
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