def md_present(mdname):
"""Check if mdname is present in /proc/mdstat"""
if not mdname:
raise ValueError('md_present requires a valid md name')
try:
mdstat = util.load_file('/proc/mdstat')
except IOError as e:
if util.is_file_not_found_exc(e):
LOG.warning('Failed to read /proc/mdstat; '
'md modules might not be loaded')
return False
else:
raise e
md_kname = dev_short(mdname)
# Find lines like:
# md10 : active raid1 vdc1[1] vda2[0]
present = [
line for line in mdstat.splitlines()
if line.split(":")[0].rstrip() == md_kname
]
if len(present) > 0:
return True
return False
def test_non_exist_dir_raises_file_not_found(self):
try:
p = self.tmp_path(os.path.sep.join(["enodir", "file"]))
block.wipe_file(p)
raise Exception("%s did not raise exception" % p)
except Exception as e:
if not util.is_file_not_found_exc(e):
raise Exception("exc was not file_not_found: %s" % e)
def test_non_exist_raises_file_not_found(self):
try:
p = self.tmp_path("enofile")
block.wipe_file(p)
raise Exception("%s did not raise exception" % p)
except Exception as e:
if not util.is_file_not_found_exc(e):
raise Exception("exc was not file_not_found: %s" % e)
def is_block_device(path):
"""
check if path is a block device
"""
try:
return stat.S_ISBLK(os.stat(path).st_mode)
except OSError as e:
if not util.is_file_not_found_exc(e):
raise
return False
def wipe_superblock(device):
"""
Wrapper for block.wipe_volume compatible with shutdown function interface
"""
blockdev = block.sysfs_to_devpath(device)
# when operating on a disk that used to have a dos part table with an
# extended partition, attempting to wipe the extended partition will fail
try:
if not block.is_online(blockdev):
LOG.debug("Device is not online (size=0), so skipping:"
" '%s'", blockdev)
return
if block.is_extended_partition(blockdev):
LOG.info(
"extended partitions do not need wiping, so skipping:"
" '%s'", blockdev)
return
except OSError as e:
if util.is_file_not_found_exc(e):
LOG.debug('Device to wipe disappeared: %s', e)
LOG.debug('/proc/partitions says: %s',
util.load_file('/proc/partitions'))
(parent, partnum) = block.get_blockdev_for_partition(blockdev)
out, _e = util.subp(['sfdisk', '-d', parent],
capture=True,
combine_capture=True)
LOG.debug('Disk partition info:\n%s', out)
return
else:
raise e
# gather any partitions
partitions = block.get_sysfs_partitions(device)
# release zfs member by exporting the pool
if zfs.zfs_supported() and block.is_zfs_member(blockdev):
poolname = zfs.device_to_poolname(blockdev)
# only export pools that have been imported
if poolname in zfs.zpool_list():
try:
zfs.zpool_export(poolname)
except util.ProcessExecutionError as e:
LOG.warning('Failed to export zpool "%s": %s', poolname, e)
if is_swap_device(blockdev):
shutdown_swap(blockdev)
# some volumes will be claimed by the bcache layer but do not surface
# an actual /dev/bcacheN device which owns the parts (backing, cache)
# The result is that some volumes cannot be wiped while bcache claims
# the device. Resolve this by stopping bcache layer on those volumes
# if present.
for bcache_path in ['bcache', 'bcache/set']:
stop_path = os.path.join(device, bcache_path)
if os.path.exists(stop_path):
LOG.debug('Attempting to release bcache layer from device: %s:%s',
device, stop_path)
if stop_path.endswith('set'):
rp = os.path.realpath(stop_path)
bcache.stop_cacheset(rp)
else:
bcache._stop_device(stop_path)
_wipe_superblock(blockdev)
# if we had partitions, make sure they've been removed
if partitions:
LOG.debug('%s had partitions, issuing partition reread', device)
retries = [.5, .5, 1, 2, 5, 7]
for attempt, wait in enumerate(retries):
try:
# only rereadpt on wiped device
block.rescan_block_devices(devices=[blockdev])
# may raise IOError, OSError due to wiped partition table
curparts = block.get_sysfs_partitions(device)
if len(curparts) == 0:
return
except (IOError, OSError):
if attempt + 1 >= len(retries):
raise
LOG.debug(
"%s partitions still present, rereading pt"
" (%s/%s). sleeping %ss before retry", device, attempt + 1,
len(retries), wait)
time.sleep(wait)
# multipath partitions are separate block devices (disks)
if multipath.is_mpath_partition(blockdev):
multipath.remove_partition(blockdev)
# multipath devices must be hidden to utilize a single member (path)
elif multipath.is_mpath_device(blockdev):
mp_id = multipath.find_mpath_id(blockdev)
if mp_id:
multipath.remove_map(mp_id)
else:
raise RuntimeError('Failed to find multipath id for %s' % blockdev)
