Fix exec()+locals() for all 4 xinntao packages (basicsr/realesrgan/gfpgan/facexlib)

All four share the identical broken Python 3.13 pattern. Extract a shared
_patch_exec_locals() helper and loop over all repos: clone, patch, install.
face-alignment (different author) still installed normally.

app.py

@@ -41,12 +41,14 @@ _NO_ISOLATION_PACKAGES = [
     "skel @ git+https://github.com/MarilynKeller/SKEL.git@c32cf16581295bff19399379efe5b776d707cd95",
 ]
 
-# Face enhancement packages that depend on basicsr
-_FACE_ENHANCE_PACKAGES = [
-    "realesrgan",
-    "gfpgan",
-    "facexlib",
-    "face-alignment",
+# basicsr / realesrgan / gfpgan / facexlib all use the same xinntao setup.py
+# pattern: exec(compile(f.read(), version_file, 'exec')) + return locals()['__version__']
+# which is broken on Python 3.13. Clone each, patch, install from local.
+_XINNTAO_REPOS = [
+    ("https://github.com/XPixelGroup/BasicSR.git",   "basicsr-build"),
+    ("https://github.com/xinntao/Real-ESRGAN.git",   "realesrgan-build"),
+    ("https://github.com/TencentARC/GFPGAN.git",     "gfpgan-build"),
+    ("https://github.com/xinntao/facexlib.git",      "facexlib-build"),
 ]
 
 # 2. Packages with over-pinned deps that conflict with our stack; install --no-deps
@@ -64,6 +66,21 @@ _CUDA_PACKAGES = [
     "detectron2 @ git+https://github.com/facebookresearch/detectron2.git@8a9d885b3d4dcf1bef015f0593b872ed8d32b4ab",
 ]
 
+def _patch_exec_locals(src_dir: Path):
+    """Patch the xinntao exec()+locals() setup.py pattern for Python 3.13.
+    exec() no longer populates the caller's locals() in 3.13; use explicit _ns dict."""
+    setup_py = src_dir / "setup.py"
+    src = setup_py.read_text(encoding="utf-8")
+    patched = src.replace(
+        "exec(compile(f.read(), version_file, 'exec'))",
+        "_ns = {}; exec(compile(f.read(), version_file, 'exec'), _ns)",
+    ).replace(
+        "return locals()['__version__']",
+        "return _ns['__version__']",
+    )
+    setup_py.write_text(patched, encoding="utf-8")
+
+
 def _install_runtime_packages():
     if _RUNTIME_PKG_MARKER.exists():
         return
@@ -85,43 +102,26 @@ def _install_runtime_packages():
         [sys.executable, "-m", "pip", "install", "--quiet", "--upgrade",
          "numpy>=2", "moderngl-window>=3.0.0"], check=True,
     )
-    # basicsr Python 3.13 fix: setup.py get_version() uses exec(compile(...))+locals()
-    # which is broken on Python 3.13 — exec() no longer populates the caller's locals().
-    # Fix: clone the repo, patch setup.py to use an explicit namespace dict, then install.
-    _basicsr_src = Path("/tmp/basicsr-build")
-    if not _basicsr_src.exists():
+    # basicsr / realesrgan / gfpgan / facexlib all share the broken exec()+locals()
+    # setup.py pattern. Clone each, patch, install from local path.
+    for _repo_url, _build_name in _XINNTAO_REPOS:
+        _src = Path(f"/tmp/{_build_name}")
+        if not _src.exists():
+            subprocess.run(
+                ["git", "clone", "--depth=1", _repo_url, str(_src)],
+                check=True,
+            )
+        _patch_exec_locals(_src)
         subprocess.run(
-            ["git", "clone", "--depth=1",
-             "https://github.com/XPixelGroup/BasicSR.git", str(_basicsr_src)],
+            [sys.executable, "-m", "pip", "install", "--quiet",
+             "--no-build-isolation", str(_src)],
             check=True,
         )
-    # Patch get_version() in setup.py for Python 3.13 compatibility.
-    # Original code (inside `with open(...) as f:` block):
-    #   exec(compile(f.read(), version_file, 'exec'))
-    #   return locals()['__version__']          ← broken on 3.13
-    # Fix: two independent single-line replacements so indentation is untouched
-    # and _ns is defined on the same line as exec (still inside the with block,
-    # so f is still open when f.read() is called).
-    _basicsr_setup = _basicsr_src / "setup.py"
-    _setup_src = _basicsr_setup.read_text(encoding="utf-8")
-    _patched = _setup_src.replace(
-        "exec(compile(f.read(), version_file, 'exec'))",
-        "_ns = {}; exec(compile(f.read(), version_file, 'exec'), _ns)",
-    ).replace(
-        "return locals()['__version__']",
-        "return _ns['__version__']",
-    )
-    _basicsr_setup.write_text(_patched, encoding="utf-8")
+    # face-alignment is from a different author and doesn't have the exec() issue
     subprocess.run(
-        [sys.executable, "-m", "pip", "install", "--quiet", "--no-build-isolation",
-         str(_basicsr_src)],
+        [sys.executable, "-m", "pip", "install", "--quiet", "face-alignment"],
         check=True,
     )
-    # Install face enhancement packages that depend on basicsr
-    subprocess.run(
-        [sys.executable, "-m", "pip", "install", "--quiet", "--no-build-isolation"]
-        + _FACE_ENHANCE_PACKAGES, check=True,
-    )
     subprocess.run(
         [sys.executable, "-m", "pip", "install", "--quiet", "--no-deps"]
         + _NO_DEPS_PACKAGES, check=True,