def _check_input(self, image_list):
'''
Takes a list of image ids, image-names, container ids, or
container-names and returns a list of images ids and
container ids
'''
dm = DockerMount(dockerclient=self.ac.conn)
work_list = []
# verify
try:
for image in image_list:
iid, dtype = dm.get_iid(image)
work_list.append(iid)
except DockerMountError:
print "Unable to associate {0} with any image " \
"or container".format(image)
sys.exit(1)
return work_list
