Add more ceph sanity checks

Author: fydai

staff/sys/makevm

@@ -10,6 +10,7 @@ import os.path
 import random
 import re
 import shlex
+import shutil
 import socket
 import subprocess
 import sys
@@ -256,15 +257,22 @@ def _main(args):
             print('Cancelled.')
             sys.exit(2)
 
+    if agrs.ceph and not shutil.which('ceph'):
+        print("Warning: You are trying to use Ceph but I couldn't find the `ceph` executable.")
+
+        if not confirm():
+            print('Cancelled.')
+            sys.exit(2)
+
     if args.ceph and args.vg != 'vg':
-        print("Warning: You have Ceph backing storage, but specified a non-default VG")
+        print("Warning: You have Ceph backing storage, but specified a non-default VG.")
 
         if not confirm():
             print('Cancelled.')
             sys.exit(2)
 
     if not args.ceph and args.ceph_pool != 'vm':
-        print("Warning: You have LVM backing storage, but specified a Ceph pool")
+        print("Warning: You have LVM backing storage, but specified a Ceph pool.")
 
         if not confirm():
             print('Cancelled.')