feat(analyzer): override paths using env variables

Allow overriding FFMPEG, FFPROBE, or LIQUIDSOAP paths using env variables.

analyzer/libretime_analyzer/pipeline/_ffmpeg.py

@@ -1,14 +1,18 @@
 import re
 from math import inf
+from os import getenv
 from pathlib import Path
 from typing import List, Optional, Tuple
 
 from ._utils import run_
 
+FFPROBE = getenv("FFPROBE_PATH", "ffprobe")
+FFMPEG = getenv("FFMPEG_PATH", "ffmpeg")
+
 
 def _ffmpeg(*args, **kwargs):
     return run_(
-        "ffmpeg",
+        FFMPEG,
         *args,
         "-f",
         "null",
@@ -20,7 +24,7 @@ def _ffmpeg(*args, **kwargs):
 
 
 def _ffprobe(*args, **kwargs):
-    return run_("ffprobe", *args, **kwargs)
+    return run_(FFPROBE, *args, **kwargs)
 
 
 _PROBE_REPLAYGAIN_RE = re.compile(

analyzer/libretime_analyzer/pipeline/_liquidsoap.py

@@ -0,0 +1,4 @@
+from os import getenv
+
+
+LIQUIDSOAP = getenv("LIQUIDSOAP_PATH", "liquidsoap")

analyzer/libretime_analyzer/pipeline/analyze_playability.py

@@ -5,14 +5,13 @@ from typing import Any, Dict
 
 from loguru import logger
 
+from ._liquidsoap import LIQUIDSOAP
+
 
 class UnplayableFileError(Exception):
     pass
 
 
-LIQUIDSOAP_EXECUTABLE = "liquidsoap"
-
-
 def analyze_playability(filename: str, metadata: Dict[str, Any]):
     """Checks if a file can be played by Liquidsoap.
     :param filename: The full path to the file to analyzer
@@ -20,7 +19,7 @@ def analyze_playability(filename: str, metadata: Dict[str, Any]):
     :return: The metadata dictionary
     """
     command = [
-        LIQUIDSOAP_EXECUTABLE,
+        LIQUIDSOAP,
         "-v",
         "-c",
         "output.dummy(audio_to_stereo(single(argv(1))))",

analyzer/tests/pipeline/analyze_playability_test.py

@@ -21,7 +21,7 @@ def test_analyze_playability(filepath):
 
 def test_analyze_playability_missing_liquidsoap():
     with patch(
-        "libretime_analyzer.pipeline.analyze_playability.LIQUIDSOAP_EXECUTABLE",
+        "libretime_analyzer.pipeline._liquidsoap.LIQUIDSOAP",
         "foobar",
     ):
         analyze_playability(str(FILES[0].path), {})