On Centos 7.4 and Python 3.6 the default code spits two errors when trying buttersink btrfs:///mnt/local/volume btrfs:///mnt/iscsi/target
It complanins of empty vars list error in btrfs receive and
Error: vars() argument must have dict attribute.
So changing these two lines in send.py from vars(cmdHeader) to cmdHeader._asdict() fixes the error.
On Centos 7.4 and Python 3.6 the default code spits two errors when trying buttersink btrfs:///mnt/local/volume btrfs:///mnt/iscsi/target
It complanins of empty vars list error in btrfs receive and Error: vars() argument must have dict attribute. So changing these two lines in send.py from vars(cmdHeader) to cmdHeader._asdict() fixes the error.