patman: Provide a way to get program output in binary mode

At present cros_subprocess and the tools library use a string to obtain
stdout from a program. This works fine on Python 2. With Python 3 we end
up with unicode errors in some cases. Fix this by providing a binary mode,
which returns the data as bytes() instead of a string.

Signed-off-by: Simon Glass <sjg@chromium.org>

tools/patman/cros_subprocess.py

@@ -54,7 +54,7 @@ class Popen(subprocess.Popen):
     """
 
     def __init__(self, args, stdin=None, stdout=PIPE_PTY, stderr=PIPE_PTY,
-                 shell=False, cwd=None, env=None, **kwargs):
+                 shell=False, cwd=None, env=None, binary=False, **kwargs):
         """Cut-down constructor
 
         Args:
@@ -72,6 +72,7 @@ class Popen(subprocess.Popen):
         """
         stdout_pty = None
         stderr_pty = None
+        self.binary = binary
 
         if stdout == PIPE_PTY:
             stdout_pty = pty.openpty()

tools/patman/tools.py

@@ -167,9 +167,9 @@ def PathHasFile(fname):
             return True
     return False
 
-def Run(name, *args):
+def Run(name, *args, **kwargs):
     try:
-        return command.Run(name, *args, cwd=outdir, capture=True)
+        return command.Run(name, *args, cwd=outdir, capture=True, **kwargs)
     except:
         if not PathHasFile(name):
             msg = "Plesae install tool '%s'" % name