def attach(env):
"""Map an existing vlmc Image to a block device
This function maps an existing vlmc Image to a block device
e.g. /dev/xsegbd{X} and returns the device path. If the mapping
already exists, it returns the corresponding device path.
"""
name = env.get("name")
# Check if the mapping already exists
d_id = vlmc.is_mapped(name)
if d_id is not None:
sys.stderr.write("The mapping exists for %s\n" % name)
# The mapping exists. Return it.
sys.stdout.write("%s" % str(DEVICE_PREFIX + str(d_id)))
return 0
# The mapping doesn't exist. Create it.
d_id = vlmc.map_volume(name=name)
# The device was successfully mapped. Return it.
#maybe assert (d_id == vlmc.is_mapped(name)
sys.stdout.write("%s" % str(DEVICE_PREFIX + str(d_id)))
sys.stderr.write("Create the mapping for %s\n" % name)
return 0
def detach(env):
"""Unmap a vlmc device from the Image it is mapped to
This function unmaps an vlmc device from the Image it is mapped to.
It is idempotent if the mapping doesn't exist at all.
"""
name = env.get("name")
#try:
# Check if the mapping already exists
d_id = vlmc.is_mapped(name)
if d_id is not None:
# The mapping exists. Unmap the vlmc device.
vlmc.unmap_volume(name=str(DEVICE_PREFIX + str(d_id)))
#assert(vlmc.is_mapped(name) == None)
return 0
def detach(env):
"""Unmap a vlmc device from the Image it is mapped to
This function unmaps an vlmc device from the Image it is mapped to.
It is idempotent if the mapping doesn't exist at all.
"""
name = env.get("name")
#try:
# Check if the mapping already exists
d_id = vlmc.is_mapped(name)
if d_id:
# The mapping exists. Unmap the vlmc device.
vlmc.unmap_volume(name=str(DEVICE_PREFIX + str(d_id)))
#assert(vlmc.is_mapped(name) == None)
return 0
