os.misc.cmd_exec(): Support NoWaitForNewline

Remove newlines argument from cmd_exec(), which wasn't honoured
anyway, and replace it with the more generic flags argument in
conjunction with support for the NoWaitForNewline flag, which does
the obvious.

Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/devtest/os/misc.py

@@ -6,9 +6,13 @@ import traceback
 import re
 import os
 from datetime import datetime, timedelta
+from enum import IntFlag
 
 from jwutils.log import *
 
+class ExecFlags(IntFlag): # export
+    NoWaitForNewline     = 0x01
+
 def consume_readbuffer(buf, carry, cmd, log_act=None, caller=None):
     r = []
     lines = buf.splitlines() if buf else []
@@ -38,7 +42,7 @@ def consume_readbuffer(buf, carry, cmd, log_act=None, caller=None):
 #  None on error
 #  [] for an empty response
 #  [first line, second line]
-async def cmd_exec(conn, cmd, act_timeout=0.1, total_timeout=None, newlines=False, log_act=None, caller=None, echo_cmd=True): # export
+async def cmd_exec(conn, cmd, act_timeout=0.1, total_timeout=None, log_act=None, caller=None, echo_cmd=True, flags = 0x0): # export
     r = []
     try:
         if isinstance(cmd, str) and not cmd.endswith('\n'):
@@ -57,8 +61,11 @@ async def cmd_exec(conn, cmd, act_timeout=0.1, total_timeout=None, newlines=Fals
                 if buf is not None and end and len(buf) == 0 and datetime.now() < end:
                     raise Exception("connection {} reset while reading command response".format(conn))
                 ret, carry = consume_readbuffer(buf, carry, None if echo_cmd else cmd, log_act=log_act, caller=caller)
+                #slog(DEBUG, 'ret = "{}", carry= "{}"'.format(ret, carry))
                 r.extend(ret)
             if rest < 0 or not buf:
+                if (flags & ExecFlags.NoWaitForNewline) and carry and len(carry):
+                    r.extend([carry])
                 d = os.getenv("JW_DEVTEST_RESPONSE_DIR")
                 if d is not None:
                     path = d + '/' + re.sub('[^a-zA-Z0-9]+', '_', cmd)