1 files changed, 22 insertions, 0 deletions
diff --git a/tools/patman/command.py b/tools/patman/command.py
index 449d3d0..d586f11 100644
--- a/tools/patman/command.py
+++ b/tools/patman/command.py
@@ -20,9 +20,25 @@ class CommandResult:
     def __init__(self):
         self.stdout = None
         self.stderr = None
+        self.combined = None
         self.return_code = None
         self.exception = None
 
+    def __init__(self, stdout='', stderr='', combined='', return_code=0,
+                 exception=None):
+        self.stdout = stdout
+        self.stderr = stderr
+        self.combined = combined
+        self.return_code = return_code
+        self.exception = exception
+
+
+# This permits interception of RunPipe for test purposes. If it is set to
+# a function, then that function is called with the pipe list being
+# executed. Otherwise, it is assumed to be a CommandResult object, and is
+# returned as the result for every RunPipe() call.
+# When this value is None, commands are executed as normal.
+test_result = None
 
 def RunPipe(pipe_list, infile=None, outfile=None,
             capture=False, capture_stderr=False, oneline=False,
@@ -44,10 +60,16 @@ def RunPipe(pipe_list, infile=None, outfile=None,
     Returns:
         CommandResult object
     """
+    if test_result:
+        if hasattr(test_result, '__call__'):
+            return test_result(pipe_list=pipe_list)
+        return test_result
     result = CommandResult()
     last_pipe = None
     pipeline = list(pipe_list)
     user_pipestr =  '|'.join([' '.join(pipe) for pipe in pipe_list])
+    kwargs['stdout'] = None
+    kwargs['stderr'] = None
     while pipeline:
         cmd = pipeline.pop(0)
         if last_pipe is not None: