you-get: hardcode ffmpeg path

pkgs/tools/misc/you-get/default.nix

@@ -1,6 +1,11 @@
-{ lib, buildPythonApplication, fetchPypi, installShellFiles }:
+{ lib
+, python3
+, substituteAll
+, ffmpeg
+, installShellFiles
+}:
 
-buildPythonApplication rec {
+python3.pkgs.buildPythonApplication rec {
   pname = "you-get";
   version = "0.4.1612";
 
@@ -8,11 +13,20 @@ buildPythonApplication rec {
   # probably aren't suitable for a build environment anyway.
   doCheck = false;
 
-  src = fetchPypi {
+  src = python3.pkgs.fetchPypi {
     inherit pname version;
     sha256 = "sha256-lKEztwwn1pnALuwDiA1Ik9+XCVyO+UMobv+hXu0mn5w=";
   };
 
+  patches = [
+    (substituteAll {
+      src = ./ffmpeg-path.patch;
+      ffmpeg = "${lib.getBin ffmpeg}/bin/ffmpeg";
+      ffprobe = "${lib.getBin ffmpeg}/bin/ffmpeg";
+      version = lib.getVersion ffmpeg;
+    })
+  ];
+
   nativeBuildInputs = [ installShellFiles ];
 
   postInstall = ''
@@ -25,7 +39,6 @@ buildPythonApplication rec {
   meta = with lib; {
     description = "A tiny command line utility to download media contents from the web";
     homepage = "https://you-get.org";
-    changelog = "https://github.com/soimort/you-get/raw/v${version}/CHANGELOG.rst";
     license = licenses.mit;
     maintainers = with maintainers; [ ryneeverett ];
   };

pkgs/tools/misc/you-get/ffmpeg-path.patch

@@ -0,0 +1,13 @@
+diff --git a/src/you_get/processor/ffmpeg.py b/src/you_get/processor/ffmpeg.py
+index 50e2c9f..46e7f61 100755
+--- a/src/you_get/processor/ffmpeg.py
++++ b/src/you_get/processor/ffmpeg.py
+@@ -31,7 +31,7 @@ def get_usable_ffmpeg(cmd):
+     except:
+         return None
+ 
+-FFMPEG, FFPROBE, FFMPEG_VERSION = get_usable_ffmpeg('ffmpeg') or get_usable_ffmpeg('avconv') or (None, None, None)
++FFMPEG, FFPROBE, FFMPEG_VERSION = ('@ffmpeg@', '@ffprobe@', '@version@')
+ if logging.getLogger().isEnabledFor(logging.DEBUG):
+     LOGLEVEL = ['-loglevel', 'info']
+     STDIN = None

pkgs/top-level/all-packages.nix

@@ -11944,7 +11944,7 @@ with pkgs;
 
   yle-dl = callPackage ../tools/misc/yle-dl {};
 
-  you-get = python3Packages.callPackage ../tools/misc/you-get { };
+  you-get = callPackage ../tools/misc/you-get { };
 
   zasm = callPackage ../development/compilers/zasm {};