[TPU] patch TPU wheel build script to resolve metadata issue (#27279)

Signed-off-by: Johnny Yang <johnnyyang@google.com>

setup.py

@@ -545,7 +545,9 @@ def get_vllm_version() -> str:
     # Allow overriding the version. This is useful to build platform-specific
     # wheels (e.g. CPU, TPU) without modifying the source.
     if env_version := os.getenv("VLLM_VERSION_OVERRIDE"):
-        return env_version
+        print(f"Overriding VLLM version with {env_version} from VLLM_VERSION_OVERRIDE")
+        os.environ["SETUPTOOLS_SCM_PRETEND_VERSION"] = env_version
+        return get_version(write_to="vllm/_version.py")
 
     version = get_version(write_to="vllm/_version.py")
     sep = "+" if "+" not in version else "."  # dev versions might contain +

tools/vllm-tpu/build.sh

@@ -7,6 +7,13 @@ TOOLS_DIR=$(cd "$(dirname "$SCRIPT_PATH_PARAM")" && pwd) # Absolute path to the
 REPO_ROOT=$(cd "$TOOLS_DIR/../../" && pwd) # Absolute path to the repo root
 VLLM_DIR="$REPO_ROOT/" # Path to the vllm sources
 
+CHANGE_FILE_LIST=(
+  "vllm/entrypoints/cli/main.py"
+  "vllm/entrypoints/cli/run_batch.py"
+  "vllm/utils/__init__.py"
+  "vllm/platforms/__init__.py"
+)
+
 # Ensure we are not running from within the vllm directory if SCRIPT_PATH_PARAM is relative like "."
 if [ "$TOOLS_DIR" = "$VLLM_DIR" ]; then
     echo "Error: This script should not be run from the vllm directory directly if using relative paths."
@@ -30,6 +37,20 @@ if ! grep -q "name = \"vllm-tpu\"" "$PYPROJECT_FILE"; then
     echo "Patching pyproject.toml project name to vllm-tpu..."
     cp "$PYPROJECT_FILE" "${PYPROJECT_FILE}.bak"
     sed -i '0,/^name = "vllm"/s//name = "vllm-tpu"/' "$PYPROJECT_FILE"
+
+    echo "Patching ${CHANGE_FILE_LIST[@]} vllm to vllm-tpu..."
+    # patching
+    #   importlib.metadata.version('vllm') -> importlib.metadata.version('vllm-tpu')
+    #   importlib.metadata.version("vllm") -> importlib.metadata.version("vllm-tpu")
+    #   importlib.metadata.metadata('vllm') -> importlib.metadata.metadata('vllm-tpu')
+    #   importlib.metadata.metadata("vllm") -> importlib.metadata.metadata("vllm-tpu")
+    #   version('vllm') -> version('vllm-tpu')
+    #   version("vllm") -> version("vllm-tpu")
+    sed -i \
+        -e "s/importlib.metadata.version(\(['\"]\)vllm\1)/importlib.metadata.version(\1vllm-tpu\1)/" \
+        -e "s/importlib.metadata.metadata(\(['\"]\)vllm\1)/importlib.metadata.metadata(\1vllm-tpu\1)/" \
+        -e "s/version(\(['\"]\)vllm\1)/version(\1vllm-tpu\1)/" \
+        "${CHANGE_FILE_LIST[@]}"
     PATCHED=true
 else
     PATCHED=false
@@ -45,6 +66,13 @@ cleanup() {
         echo "Restoring original pyproject.toml..."
         cp "${PYPROJECT_FILE}.bak" "$PYPROJECT_FILE"
         rm -f "${PYPROJECT_FILE}.bak"
+
+        echo "Restoring vllm code..."
+        sed -i \
+            -e "s/importlib.metadata.version(\(['\"]\)vllm-tpu\1)/importlib.metadata.version(\1vllm\1)/" \
+            -e "s/importlib.metadata.metadata(\(['\"]\)vllm-tpu\1)/importlib.metadata.metadata(\1vllm\1)/" \
+            -e "s/version(\(['\"]\)vllm-tpu\1)/version(\1vllm\1)/" \
+            "${CHANGE_FILE_LIST[@]}"
     fi
 }
 trap cleanup EXIT HUP INT QUIT PIPE TERM # Register cleanup function to run on script exit and various signals