1 files changed, 10 insertions, 0 deletions
diff --git a/tests/functional/qemu_test/cmd.py b/tests/functional/qemu_test/cmd.py
index 11c8334a7c..4106f1ee7c 100644
--- a/tests/functional/qemu_test/cmd.py
+++ b/tests/functional/qemu_test/cmd.py
@@ -18,6 +18,16 @@ import subprocess
 
 from .config import BUILD_DIR
 
+def which(tool):
+    """ looks up the full path for @tool, returns None if not found
+        or if @tool does not have executable permissions.
+    """
+    paths=os.getenv('PATH')
+    for p in paths.split(os.path.pathsep):
+        p = os.path.join(p, tool)
+        if os.path.exists(p) and os.access(p, os.X_OK):
+            return p
+    return None
 
 def has_cmd(name, args=None):
     """