def _check_for_existing_snapshot(self):
"""Check if an existing snapshot is alive"""
if not self.snapshot and self.logical_volume:
snapshot_lv = '%s/%s' % (self.logical_volume.vg_name,
self.snapshot_name or
self.logical_volume.lv_name + '_snapshot')
LOGGER.info("Checking for outstanding snapshot: %s", snapshot_lv)
try:
self.snapshot = LogicalVolume.find_one(snapshot_lv)
except:
LOGGER.info("No outstanding snapshot found.")
def start(self):
"""Start and initialize the snapshot process"""
logging.info("Finding volume for directory: %s",
self.target_directory)
mountpoint = getmount(self.target_directory)
LOGGER.info("Mount point for directory: %s", mountpoint)
self.relpath = relpath(self.target_directory, mountpoint)
LOGGER.info("Path relative to snapshot mountpoint: %s", self.relpath)
self.logical_volume = LogicalVolume.find_mounted(mountpoint)
if not self.logical_volume:
raise LVMError("No logical volume found for mountpoint=%r target_path=%r" % (mountpoint, self.target_directory))
LOGGER.info("%r is on logical volume %s/%s",
self.target_directory,
self.logical_volume.vg_name,
self.logical_volume.lv_name)
self.run_callback('init')
return self.create_snapshot()
