From 2ddd2cc8f9be62dbd7ad4f08c2dc7c53180f662b Mon Sep 17 00:00:00 2001
From: youkaichao <youkaichao@gmail.com>
Date: Sat, 21 Sep 2024 23:24:58 -0700
Subject: [PATCH] [ci][build] fix vllm-flash-attn (#8699)

---
 CMakeLists.txt                |  3 +++
 setup.py                      | 15 +++++++++++++++
 vllm/vllm_flash_attn/.gitkeep |  0
 3 files changed, 18 insertions(+)
 create mode 100644 vllm/vllm_flash_attn/.gitkeep

diff --git a/CMakeLists.txt b/CMakeLists.txt
index e0716af6fff4f..03937e4e0658b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -382,6 +382,9 @@ endif()
 # Set the parent build flag so that the vllm-flash-attn library does not redo compile flag and arch initialization.
 set(VLLM_PARENT_BUILD ON)
 
+# Ensure the vllm/vllm_flash_attn directory exists before installation
+install(CODE "file(MAKE_DIRECTORY \"\${CMAKE_INSTALL_PREFIX}/vllm/vllm_flash_attn\")" COMPONENT vllm_flash_attn_c)
+
 # Make sure vllm-flash-attn install rules are nested under vllm/
 install(CODE "set(CMAKE_INSTALL_LOCAL_ONLY FALSE)" COMPONENT vllm_flash_attn_c)
 install(CODE "set(OLD_CMAKE_INSTALL_PREFIX \"\${CMAKE_INSTALL_PREFIX}\")" COMPONENT vllm_flash_attn_c)
diff --git a/setup.py b/setup.py
index cc559f26c6f3f..60e31af0a8d39 100644
--- a/setup.py
+++ b/setup.py
@@ -258,6 +258,21 @@ def build_extensions(self) -> None:
             ]
             subprocess.check_call(install_args, cwd=self.build_temp)
 
+    def run(self):
+        # First, run the standard build_ext command to compile the extensions
+        super().run()
+
+        # copy vllm/vllm_flash_attn/*.py from self.build_lib to current
+        # directory so that they can be included in the editable build
+        import glob
+        files = glob.glob(
+            os.path.join(self.build_lib, "vllm", "vllm_flash_attn", "*.py"))
+        for file in files:
+            dst_file = os.path.join("vllm/vllm_flash_attn",
+                                    os.path.basename(file))
+            print(f"Copying {file} to {dst_file}")
+            self.copy_file(file, dst_file)
+
 
 def _no_device() -> bool:
     return VLLM_TARGET_DEVICE == "empty"
diff --git a/vllm/vllm_flash_attn/.gitkeep b/vllm/vllm_flash_attn/.gitkeep
new file mode 100644
index 0000000000000..e69de29bb2d1d