Verify that submodules are checked out

setup.py

@@ -6,6 +6,8 @@
 import glob
 import os
 import subprocess
+import sys
+import time
 from datetime import datetime
 
 from setuptools import find_packages, setup
@@ -58,6 +60,71 @@ def read_version(file_path="version.txt"):
     CUDAExtension,
 )
 
+# Constant known variables used throughout this file
+cwd = os.path.abspath(os.path.curdir)
+third_party_path = os.path.join(cwd, "third_party")
+
+
+def get_submodule_folders():
+    git_modules_path = os.path.join(cwd, ".gitmodules")
+    default_modules_path = [
+        os.path.join(third_party_path, name)
+        for name in [
+            "cutlass",
+        ]
+    ]
+    if not os.path.exists(git_modules_path):
+        return default_modules_path
+    with open(git_modules_path) as f:
+        return [
+            os.path.join(cwd, line.split("=", 1)[1].strip())
+            for line in f
+            if line.strip().startswith("path")
+        ]
+
+
+def check_submodules():
+    def check_for_files(folder, files):
+        if not any(os.path.exists(os.path.join(folder, f)) for f in files):
+            print("Could not find any of {} in {}".format(", ".join(files), folder))
+            print("Did you run 'git submodule update --init --recursive'?")
+            sys.exit(1)
+
+    def not_exists_or_empty(folder):
+        return not os.path.exists(folder) or (
+            os.path.isdir(folder) and len(os.listdir(folder)) == 0
+        )
+
+    if bool(os.getenv("USE_SYSTEM_LIBS", False)):
+        return
+    folders = get_submodule_folders()
+    # If none of the submodule folders exists, try to initialize them
+    if all(not_exists_or_empty(folder) for folder in folders):
+        try:
+            print(" --- Trying to initialize submodules")
+            start = time.time()
+            subprocess.check_call(
+                ["git", "submodule", "update", "--init", "--recursive"], cwd=cwd
+            )
+            end = time.time()
+            print(f" --- Submodule initialization took {end - start:.2f} sec")
+        except Exception:
+            print(" --- Submodule initalization failed")
+            print("Please run:\n\tgit submodule update --init --recursive")
+            sys.exit(1)
+    for folder in folders:
+        check_for_files(
+            folder,
+            [
+                "CMakeLists.txt",
+                "Makefile",
+                "setup.py",
+                "LICENSE",
+                "LICENSE.md",
+                "LICENSE.txt",
+            ],
+        )
+
 
 def get_extensions():
     debug_mode = os.getenv("DEBUG", "0") == "1"
@@ -106,8 +173,7 @@ def get_extensions():
     use_cutlass = False
     if use_cuda and not IS_WINDOWS:
         use_cutlass = True
-        this_dir = os.path.abspath(os.path.curdir)
-        cutlass_dir = os.path.join(this_dir, "third_party", "cutlass")
+        cutlass_dir = os.path.join(third_party_path, "cutlass")
         cutlass_include_dir = os.path.join(cutlass_dir, "include")
     if use_cutlass:
         extra_compile_args["nvcc"].extend(
@@ -145,6 +211,8 @@ def get_extensions():
     return ext_modules
 
 
+check_submodules()
+
 setup(
     name="torchao",
     version=version + version_suffix,