General: Fix python 2 compatibility of ffmpeg and oiio tools discovery

openpype/lib/vendor_bin_utils.py

@@ -195,6 +195,28 @@ def find_tool_in_custom_paths(paths, tool, validation_func=None):
  return None
 
 
+def _check_args_returncode(args):
+ try:
+ # Python 2 compatibility where DEVNULL is not available
+ if hasattr(subprocess, "DEVNULL"):
+ proc = subprocess.Popen(
+ args,
+ stdout=subprocess.DEVNULL,
+ stderr=subprocess.DEVNULL,
+ )
+ proc.wait()
+ else:
+ with open(os.devnull, "w") as devnull:
+ proc = subprocess.Popen(
+ args, stdout=devnull, stderr=devnull,
+ )
+ proc.wait()
+
+ except Exception:
+ return False
+ return proc.returncode == 0
+
+
 def _oiio_executable_validation(filepath):
  """Validate oiio tool executable if can be executed.
 
@@ -223,18 +245,7 @@ def _oiio_executable_validation(filepath):
  if not filepath:
  return False
 
- try:
- proc = subprocess.Popen(
- [filepath, "--help"],
- stdout=subprocess.DEVNULL,
- stderr=subprocess.DEVNULL,
- )
- proc.wait()
- return proc.returncode == 0
-
- except Exception:
- pass
- return False
+ return _check_args_returncode([filepath, "--help"])
 
 
 def get_oiio_tools_path(tool="oiiotool"):
@@ -302,18 +313,7 @@ def _ffmpeg_executable_validation(filepath):
  if not filepath:
  return False
 
- try:
- proc = subprocess.Popen(
- [filepath, "-version"],
- stdout=subprocess.DEVNULL,
- stderr=subprocess.DEVNULL,
- )
- proc.wait()
- return proc.returncode == 0
-
- except Exception:
- pass
- return False
+ return _check_args_returncode([filepath, "-version"])
 
 
 def get_ffmpeg_tool_path(tool="ffmpeg"):