M01: add stub repositories for deterministic CI

- Create scripts/dev/create_stub_repos.py to satisfy paths.py assertion
  and import chain without cloning external repos
- Add Create stub repositories step before Setup environment in run_tests
- Remove Cache repositories step (stubs are deterministic, no network)

Made-with: Cursor

.github/workflows/run_tests.yaml

@@ -25,12 +25,6 @@ jobs:
         with:
           path: models
           key: "2023-12-30"
-      - name: Cache repositories
-        id: cache-repos
-        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830
-        with:
-          path: repositories
-          key: "repos-2023-12-30"
       - name: Install test dependencies
         run: pip install wait-for-it -r requirements-test.txt
         env:
@@ -53,6 +47,8 @@ jobs:
         env:
           PIP_DISABLE_PIP_VERSION_CHECK: "1"
           PIP_PROGRESS_BAR: "off"
+      - name: Create stub repositories
+        run: python scripts/dev/create_stub_repos.py
       - name: Setup environment
         run: python launch.py --skip-prepare-environment --skip-torch-cuda-test --exit
         env:

scripts/dev/create_stub_repos.py

@@ -0,0 +1,62 @@
+#!/usr/bin/env python3
+"""
+Create minimal stub repositories for CI.
+Satisfies paths.py assertion and import chain without cloning external repos.
+Deterministic, no network required.
+"""
+import os
+
+_here = os.path.dirname(os.path.abspath(__file__))
+SCRIPT_DIR = os.path.dirname(os.path.dirname(_here))
+REPOS = os.path.join(SCRIPT_DIR, "repositories")
+
+
+def touch(path: str, content: str = "") -> None:
+    os.makedirs(os.path.dirname(path), exist_ok=True)
+    with open(path, "w", encoding="utf-8") as f:
+        f.write(content)
+
+
+def main() -> None:
+    sd = "stable-diffusion-stability-ai"
+    # paths.py asserts ldm/models/diffusion/ddpm.py
+    touch(os.path.join(REPOS, sd, "ldm", "models", "diffusion", "ddpm.py"), "# stub\n")
+    touch(os.path.join(REPOS, sd, "ldm", "__init__.py"))
+    touch(os.path.join(REPOS, sd, "ldm", "modules", "__init__.py"))
+    touch(os.path.join(REPOS, sd, "ldm", "modules", "encoders", "__init__.py"))
+    # ldm.modules.encoders.modules: FrozenCLIPEmbedder, FrozenOpenCLIPEmbedder, CLIPTextModel
+    ldm_modules = (
+        "class FrozenCLIPEmbedder:\n    pass\n"
+        "class FrozenOpenCLIPEmbedder:\n    pass\n"
+        "class CLIPTextModel:\n    pass\n"
+    )
+    touch(os.path.join(REPOS, sd, "ldm", "modules", "encoders", "modules.py"), ldm_modules)
+
+    # generative-models: sgm.modules.encoders.modules
+    gm = "generative-models"
+    touch(os.path.join(REPOS, gm, "sgm", "__init__.py"))
+    touch(os.path.join(REPOS, gm, "sgm", "modules", "__init__.py"))
+    touch(os.path.join(REPOS, gm, "sgm", "modules", "encoders", "__init__.py"))
+    sgm_modules = (
+        "class FrozenCLIPEmbedder:\n    pass\n"
+        "class FrozenOpenCLIPEmbedder2:\n    pass\n"
+        "class ConcatTimestepEmbedderND:\n    pass\n"
+    )
+    touch(os.path.join(REPOS, gm, "sgm", "modules", "encoders", "modules.py"), sgm_modules)
+
+    # k-diffusion: k_diffusion.sampling
+    kd = "k-diffusion"
+    touch(os.path.join(REPOS, kd, "k_diffusion", "__init__.py"))
+    touch(os.path.join(REPOS, kd, "k_diffusion", "sampling.py"), "# stub\n")
+
+    # BLIP: models/blip.py
+    touch(os.path.join(REPOS, "BLIP", "models", "blip.py"), "# stub\n")
+
+    # stable-diffusion-webui-assets (optional, paths may warn)
+    touch(os.path.join(REPOS, "stable-diffusion-webui-assets", ".gitkeep"))
+
+    print("Stub repositories created.")
+
+
+if __name__ == "__main__":
+    main()