python3Packages.imageio: fix build, enable most tests

With 624897829b, the new parenthesization logic exposes a coding defect in `imageio` where they do a string test vs. `"not needs_internet"` instead of something parsed.

Instead of fixing that, we can actually enable almost all of the tests in this module with a command-line flag which points to a FOD of https://github.com/imageio/test_images repository.

There are a few more tests that need to be disabled as well; I opened a PR against imageio to fix these.

I also removed the `libgl-path.patch` in favor of a simple `--replace-fail`.

pkgs/development/python-modules/imageio/default.nix

@@ -4,7 +4,6 @@
   buildPythonPackage,
   fetchFromGitHub,
   isPyPy,
-  replaceVars,
 
   # build-system
   setuptools,
@@ -26,9 +25,21 @@
 
   # tests
   pytestCheckHook,
+  gitMinimal,
   fsspec,
 }:
 
+let
+  test_images = fetchFromGitHub {
+    owner = "imageio";
+    repo = "test_images";
+    rev = "f676c96b1af7e04bb1eed1e4551e058eb2f14acd";
+    leaveDotGit = true;
+    hash = "sha256-Kh8DowuhcCT5C04bE5yJa2C+efilLxP0AM31XjnHRf4=";
+  };
+  libgl = "${libGL.out}/lib/libGL${stdenv.hostPlatform.extensions.sharedLibrary}";
+in
+
 buildPythonPackage rec {
   pname = "imageio";
   version = "2.37.0";
@@ -41,11 +52,10 @@ buildPythonPackage rec {
     hash = "sha256-/nxJxZrTYX7F2grafIWwx9SyfR47ZXyaUwPHMEOdKkI=";
   };
 
-  patches = lib.optionals (!stdenv.hostPlatform.isDarwin) [
-    (replaceVars ./libgl-path.patch {
-      libgl = "${libGL.out}/lib/libGL${stdenv.hostPlatform.extensions.sharedLibrary}";
-    })
-  ];
+  postPatch = lib.optionalString (!stdenv.hostPlatform.isDarwin) ''
+    substituteInPlace tests/test_core.py \
+      --replace-fail 'ctypes.util.find_library("GL")' '"${libgl}"'
+  '';
 
   build-system = [ setuptools ];
 
@@ -77,14 +87,28 @@ buildPythonPackage rec {
 
   nativeCheckInputs = [
     fsspec
+    gitMinimal
     psutil
     pytestCheckHook
   ]
   ++ fsspec.optional-dependencies.github
   ++ lib.flatten (builtins.attrValues optional-dependencies);
 
+  pytestFlags = [ "--test-images=file://${test_images}" ];
+
+  # These should have had `needs_internet` mark applied but don't so far.
+  # See https://github.com/imageio/imageio/pull/1142
+  disabledTests = [
+    "test_read_stream"
+    "test_uri_reading"
+    "test_trim_filter"
+  ];
+
   disabledTestMarks = [ "needs_internet" ];
 
+  # These tests require the old and vulnerable freeimage binaries; skip.
+  disabledTestPaths = [ "tests/test_freeimage.py" ];
+
   preCheck = ''
     export IMAGEIO_USERDIR=$(mktemp -d)
     export HOME=$(mktemp -d)

pkgs/development/python-modules/imageio/libgl-path.patch

@@ -1,13 +0,0 @@
-diff --git a/tests/test_core.py b/tests/test_core.py
-index 2cdbb3a..032974c 100644
---- a/tests/test_core.py
-+++ b/tests/test_core.py
-@@ -129,7 +129,7 @@ def test_findlib2():
-     open(os.path.join(fi_dir, "notalib.test.so"), "wb")
- 
-     # Loading libs
--    gllib = ctypes.util.find_library("GL")
-+    gllib = "@libgl@"
-     core.load_lib([gllib], [])
-     # Fail
-     raises(ValueError, core.load_lib, [], [])  # Nothing given