almalinux/pungi
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iso-wrapper: Capture debug information for mounting

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Occasionally we have seen the mount command fail. The default error
message says to set some environment variables and try again. We can
just always set the environment and only print the output on failure.

Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>
This commit is contained in:
Lubomír Sedlář 2017-05-16 10:28:55 +02:00
parent 77ee882c21
commit 63c0bbc5c9
2 changed files with 23 additions and 1 deletions
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10
pungi/wrappers/iso.py
View File

@ -411,7 +411,15 @@ def mount(image, logger=None):
# use guestmount to mount the image, which doesn't require root privileges
# LIBGUESTFS_BACKEND=direct: running qemu directly without libvirt
with util.temp_dir(prefix='iso-mount-') as mount_dir:
run(["LIBGUESTFS_BACKEND=direct", "guestmount", "-a", image, "-m", "/dev/sda", mount_dir])
env = {'LIBGUESTFS_BACKEND': 'direct', 'LIBGUESTFS_DEBUG': '1', 'LIBGUESTFS_TRACE': '1'}
cmd = ["guestmount", "-a", image, "-m", "/dev/sda", mount_dir]
ret, out = run(cmd, env=env, can_fail=True)
if ret != 0:
# The mount command failed, something is wrong. Log the output and raise an exception.
if logger:
logger.log_error('Command %s exited with %s and output:\n%s'
% (cmd, ret, out))
raise RuntimeError('Failed to mount %s' % image)
try:
yield mount_dir
finally:

14
tests/test_iso_wrapper.py
View File

@ -41,6 +41,7 @@ class TestIsoUtils(unittest.TestCase):
@mock.patch('pungi.util.run_unmount_cmd')
@mock.patch('pungi.wrappers.iso.run')
def test_mount_iso(self, mock_run, mock_unmount):
mock_run.return_value = (0, '')
with iso.mount('dummy') as temp_dir:
self.assertTrue(os.path.isdir(temp_dir))
self.assertEqual(len(mock_run.call_args_list), 1)
@ -50,6 +51,7 @@ class TestIsoUtils(unittest.TestCase):
@mock.patch('pungi.util.run_unmount_cmd')
@mock.patch('pungi.wrappers.iso.run')
def test_mount_iso_always_unmounts(self, mock_run, mock_unmount):
mock_run.return_value = (0, '')
try:
with iso.mount('dummy') as temp_dir:
self.assertTrue(os.path.isdir(temp_dir))
@ -59,3 +61,15 @@ class TestIsoUtils(unittest.TestCase):
self.assertEqual(len(mock_run.call_args_list), 1)
self.assertEqual(len(mock_unmount.call_args_list), 1)
self.assertFalse(os.path.isdir(temp_dir))
@mock.patch('pungi.util.run_unmount_cmd')
@mock.patch('pungi.wrappers.iso.run')
def test_mount_iso_raises_on_error(self, mock_run, mock_unmount):
log = mock.Mock()
mock_run.return_value = (1, 'Boom')
with self.assertRaises(RuntimeError):
with iso.mount('dummy', logger=log) as temp_dir:
self.assertTrue(os.path.isdir(temp_dir))
self.assertEqual(len(mock_run.call_args_list), 1)
self.assertEqual(len(mock_unmount.call_args_list), 0)
self.assertEqual(len(log.mock_calls), 1)