cephfs-shell: assert python3

There's little reason to support this new tool with python2.

Fixes: http://tracker.ceph.com/issues/40418
Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>

diff --git a/src/tools/cephfs/cephfs-shell b/src/tools/cephfs/cephfs-shell
index 6c9781485d6e5c1c02fba8565827751e0b959c31..769c16b782288c1d9ff1db61b9d2bb9784c3cae2 100755 (executable)
--- a/src/tools/cephfs/cephfs-shell
+++ b/src/tools/cephfs/cephfs-shell
@@ -15,6 +15,9 @@ import math
 import re
 import shlex
 
+if sys.version_info.major < 3:
+   raise RuntimeError("cephfs-shell is only compatible with python3")
+
 try:
     from cmd2 import with_argparser
 except ImportError: