Merge pull request #494 from dhozac/ssh-conn-helpful

Make the SSH transport helpful

lib/ansible/runner/connection/ssh.py

@@ -59,7 +59,7 @@ class SSHConnection(object):
     def exec_command(self, cmd, tmp_path,sudo_user,sudoable=False):
         ''' run a command on the remote host '''
 
-        ssh_cmd = ["ssh", "-tt"] + self.common_args + [self.userhost]
+        ssh_cmd = ["ssh", "-tt", "-q"] + self.common_args + [self.userhost]
         if self.runner.sudo and sudoable:
             # Rather than detect if sudo wants a password this time, -k makes 
             # sudo always ask for a password if one is required. The "--"
@@ -96,8 +96,20 @@ class SSHConnection(object):
         else:
             ssh_cmd.append(cmd)
             p = subprocess.Popen(ssh_cmd, stdin=subprocess.PIPE,
-                                 stdout=subprocess.PIPE, stderr=subprocess.PIPE)
-        return (p.stdin, p.stdout, '')
+                                 stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
+
+        # We can't use p.communicate here because the ControlMaster may have stdout open as well
+        p.stdin.close()
+        stdout = ''
+        while p.poll() is None:
+            rfd, wfd, efd = select.select([p.stdout], [], [p.stdout], 1)
+            if p.stdout in rfd:
+                stdout += os.read(p.stdout.fileno(), 1024)
+
+        if p.returncode != 0 and stdout.find('Bad configuration option: ControlPersist') != -1:
+            raise errors.AnsibleError('using -c ssh on certain older ssh versions may not support ControlPersist, set ANSIBLE_SSH_ARGS="" before running again')
+            
+        return ('', stdout, '')
 
     def put_file(self, in_path, out_path):
         ''' transfer a file from local to remote '''