os.Environment, os.Machine: Add --be-opts

--be-opts is a means to pass machine-backend-specific options to that
backend.

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

src/python/devtest/os/Environment.py

@@ -5,6 +5,21 @@ from datetime import datetime
 from .Connections import Connections
 from jwutils import Options
 from jwutils.log import *
+import shlex
+
+def _parse_opts_str(s):
+    lexer = shlex.shlex(s, posix=True)
+    lexer.whitespace = ','
+    lexer.whitespace_split = True
+    ret = {}
+    for pair in lexer:
+        try:
+            t = pair.split('=', 1)
+            ret[t[0]] = t[1]
+            continue
+        except:
+            ret[pair] = True
+    return ret
 
 class Environment:
 
@@ -20,6 +35,7 @@ class Environment:
         self.time_stamp = (datetime.now() if args.time_stamp is None else datetime.strptime(args.time_stamp, fmt)).strftime(fmt)
         self.tag = args.tag
         slog(INFO, "Tag = {}\n".format(self.tag))
+        self.be_opts = _parse_opts_str(args.be_opts)
         self.connections = Connections()
         for spec in args.connection:
             self.connections.append(spec)

src/python/devtest/os/MachineCmd.py

@@ -13,6 +13,7 @@ class MachineCmd(jwutils.Cmd): # export
     def add_parser(self, parsers):
         p = super().add_parser(parsers)
         p.add_argument("-B", "--backend", help="Machine backend", default='qemu')
+        p.add_argument(      "--be-opts", help="Machine backend options", default='')
         p.add_argument("-P", "--platform", help="Target platform type", required=True)
         p.add_argument("-C", "--connection", help="Connection specification of the form 'proto=console,phase=pre|up-shutdown'", action='append', default=[])
         p.add_argument("-T", "--test-case-path", help="Test case search path, directories separated by colons", required=True)