+def ssh_no_error(ssh, cmd, sudo=False):
+ """Execute a command over ssh channel, and log and exit if the command
+ fails.
+
+ :param ssh: SSH() object connected to a node.
+ :param cmd: Command line to execute on remote node.
+ :type ssh: SSH() object
+ :type cmd: str
+ :return: stdout from the SSH command.
+ :rtype: str
+ """
+
+ if sudo:
+ ret, stdo, stde = ssh.exec_command_sudo(cmd)
+ else:
+ ret, stdo, stde = ssh.exec_command(cmd)
+
+ if ret != 0:
+ print 'Command execution failed: "{}"'.format(cmd)
+ print 'stdout: {0}'.format(stdo)
+ print 'stderr: {0}'.format(stde)
+ raise RuntimeError('Unexpected ssh command failure')
+
+ return stdo
+
+