def load_drive(self, slot, drive=0):
"""
Loads the disk from the specified slot into the specified drive (default drive is 0)
"""
try:
sh.mtx('-f', self.changer, 'altres', 'load', slot, drive)
except sh.ErrorReturnCode_1:
raise DriveAlreadyLoaded()
def unload_drive(self, slot=None, drive=0):
"""
Unloads the disc from the specified drive (default 0) into the specified slot, or the slot
slot that the disc originally came from if unspecified
"""
try:
if slot is None:
sh.mtx('-f', self.changer, 'altres', 'unload')
else:
sh.mtx('-f', self.changer, 'altres', 'unload', slot)
except sh.ErrorReturnCode_1:
raise FailedToUnloadDrive()
def eject(self, slot):
"""
Causes the changer to unload the disk from the specified slot and eject it from the changer
"""
ejected = False
try:
sh.mtx('-f', self.changer, 'altres', 'eepos', '0', 'transfer', slot, self.ioslot)
ejected = True
self.status[slot]['full'] = False
except sh.ErrorReturnCode_1:
pass
return ejected
def update_status(self):
rawstatus = sh.mtx('-f', self.changer, "altres", "status").split("\n")
mtxregexstring = "Storage Element (?P<number>[0-9]*)(?P<io> IMPORT/EXPORT|):"
mtxregexstring += "(?P<state>Empty|Full).*"
mtxregex = re.compile(mtxregexstring)
for line in rawstatus:
parseresult = mtxregex.match(line.strip())
if parseresult is not None:
status = parseresult.groupdict()
# If this is our import/export slot, make note of it
if status['io'] != "":
self.ioslot = status['number']
# If this is our first run and we're just learning about the different elements
elif status['number'] not in self.status:
self.status[status['number']] = {}
self.status[status['number']]['full'] = status['state'] == "Full"
# If we previously believed this to be in a different state than it is, then our
# information about what's in there is probably wrong
elif 'state' in self.status[status['number']]:
if status['state'] != self.status[status['number']]['state']:
self.status[status['number']] = {}
self.status[status['number']]['full'] = status['state'] == "Full"
return self.status
def load(self, slot=None):
"""
Causes the changer to accept a disk and load it into the specified slot. If no slot is
specified, it selects an empty slot (update_status() must have been run already). Returns
the slot the disk was inserted into
"""
if self.ioslot is None:
raise NeverScannedError()
if slot is None:
for possible in self.status:
if self.status[possible]['full'] is False:
slot = possible
if slot is None:
# No slots available to load stuff into
raise NoSlotsAvailableError()
try:
sh.mtx('-f', self.changer, 'altres', 'eepos', '0', 'transfer', self.ioslot, slot)
self.status[slot]['full'] = True
return slot
except sh.ErrorReturnCode_1:
return False
# sanity check; all tapes should be 8 chars and end in M8
if len(tapes) != len([k for k in tapes if k.endswith("M8") and len(k) == 8]):
print(f"Got arguments: {tapes}.")
print("All tape IDs should be 8 characters long and end in M8.")
sys.exit(1)
# no repeated tapes allowed
if len(tapes) != len(set(tapes)):
print("You may not repeat the same tape ID more than once.")
sys.exit(1)
# check if we have 4 empty mailslots
raw_slots = mtx("-f", tape_device, "status")
empty_mailslots = [
k for k in raw_slots.split("\n") if "IMPORT/EXPORT:Empty" in k
]
if len(empty_mailslots) != 4:
print(f"Need 4 empty mailslots; found {len(empty_mailslots)}.")
sys.exit(1)
mailslots = list(
map(lambda sub: "".join([ele for ele in sub if ele.isnumeric()]),
empty_mailslots))
# now we need to figure out which slots are which tapes
