def get_mapped():
# If tap-ctl exists return mapped volumes even if blktap module is
# disabled. There is always the possibility we are facing a mixed
# situation where the blktap module is disabled but we have remaining
# archipelago volumes.
if find_executable(VlmcTapdisk.TAP_CTL):
return VlmcTapdisk.list()
else:
# If the executable does not exist and the blktap module is disabled
# we can assume that we can safely return an empty list.
if not config['BLKTAP_ENABLED']:
return []
else:
# Assume that blktap-archipelago-utils package is not
# installed and that tap-ctl executable is missing.
# That way we provide a hint where to find tap-ctl file.
raise Error("%s\n%s" % ("Cannot execute tap-ctl command.",
"Maybe blktap-archipelago-utils package "
"is missing or you don't have sufficient "
"privileges"))
