better escaping for the exec command

ChangeLog.md

@@ -1,5 +1,5 @@
 ## Versions ##
-* v2.0.0 (2016-06-xx)
+* v2.0.0 (2016-06-13)
   * COMPATIBLE WITH: `counterparty-lib` 9.54.0 and `counterblock` 1.3.1
   * Total revamp to use Docker and Docker Compose
   * No upgrade path: Please rebuild your nodes using the instructions available at [here](http://counterparty.io/docs/federated_node/)

fednode.py

@@ -5,6 +5,7 @@
 
 import sys
 import os
+import re
 import argparse
 import copy
 import subprocess
@@ -204,7 +205,11 @@ def main():
     elif args.command == 'ps':
         run_compose_cmd(docker_config_path, "ps")
     elif args.command == 'exec':
-        os.system("docker exec -i -t federatednode_{}_1 {}".format(args.service, ' '.join(args.cmd)))
+        if len(args.cmd) == 1 and re.match("['\"].*?['\"]", args.cmd[0]):
+            cmd = args.cmd
+        else:
+            cmd = '"{}"'.format(' '.join(args.cmd).replace('"', '\\"'))
+        os.system("docker exec -i -t federatednode_{}_1 bash -c {}".format(args.service, cmd))
     elif args.command == 'shell':
         exec_result = os.system("docker exec -i -t federatednode_{}_1 bash".format(args.service))
         if exec_result != 0: