[Misc] Add generated git commit hash as vllm.__commit__ (#6386)

setup.py

@@ -5,6 +5,7 @@ import os
 import re
 import subprocess
 import sys
+import warnings
 from shutil import which
 from typing import Dict, List
 
@@ -26,6 +27,29 @@ def load_module_from_path(module_name, path):
 ROOT_DIR = os.path.dirname(__file__)
 logger = logging.getLogger(__name__)
 
+
+def embed_commit_hash():
+    try:
+        commit_id = subprocess.check_output(["git", "rev-parse", "HEAD"],
+                                            encoding="utf-8").strip()
+        commit_contents = f'__commit__ = "{commit_id}"\n'
+
+        version_file = os.path.join(ROOT_DIR, "vllm", "commit_id.py")
+        with open(version_file, "w", encoding="utf-8") as f:
+            f.write(commit_contents)
+
+    except subprocess.CalledProcessError as e:
+        warnings.warn(f"Failed to get commit hash:\n{e}",
+                      RuntimeWarning,
+                      stacklevel=2)
+    except Exception as e:
+        warnings.warn(f"Failed to embed commit hash:\n{e}",
+                      RuntimeWarning,
+                      stacklevel=2)
+
+
+embed_commit_hash()
+
 # cannot import envs directly because it depends on vllm,
 #  which is not installed yet
 envs = load_module_from_path('envs', os.path.join(ROOT_DIR, 'vllm', 'envs.py'))