ValueError in get_blockdev_type creating block backstore of SD card

[tjnycum]

$ sudo targetcli
targetcli shell version 2.1.fb43
Copyright 2011-2013 by Datera, Inc and others.
For help on commands, type 'help'.

/backstores/block> ls
o- block ...................................................................................................... [Storage Objects: 0]
/backstores/block> create sdcard /dev/mmcblk0
Traceback (most recent call last):
File "/usr/bin/targetcli", line 121, in
main()
File "/usr/bin/targetcli", line 111, in main
shell.run_interactive()
File "/usr/lib/python3/dist-packages/configshell_fb/shell.py", line 894, in run_interactive
self._cli_loop()
File "/usr/lib/python3/dist-packages/configshell_fb/shell.py", line 723, in _cli_loop
self.run_cmdline(cmdline)
File "/usr/lib/python3/dist-packages/configshell_fb/shell.py", line 837, in run_cmdline
self._execute_command(path, command, pparams, kparams)
File "/usr/lib/python3/dist-packages/configshell_fb/shell.py", line 812, in _execute_command
result = target.execute_command(command, pparams, kparams)
File "/usr/lib/python3/dist-packages/configshell_fb/node.py", line 1406, in execute_command
return method(*pparams, **kparams)
File "/usr/lib/python3/dist-packages/targetcli/ui_backstore.py", line 409, in ui_command_create
so = BlockStorageObject(name, dev, readonly=readonly, wwn=wwn)
File "/usr/lib/python3/dist-packages/rtslib_fb/tcm.py", line 672, in init
self._configure(dev, wwn, readonly)
File "/usr/lib/python3/dist-packages/rtslib_fb/tcm.py", line 681, in _configure
if get_blockdev_type(dev) != 0:
File "/usr/lib/python3/dist-packages/rtslib_fb/utils.py", line 200, in get_blockdev_type
disk_type = int(fread("/sys/block/%s/device/type" % os.path.basename(dev)))
ValueError: invalid literal for int() with base 10: 'SD'

I don't know which of the three repos this issue would best be attached to (this one, configshell-fb, or rtslib-fb), so apologies if this is the wrong one.