Add integration test for uv_build package and fix invocation

.github/workflows/ci.yml

@@ -1362,6 +1362,54 @@ jobs:
           UV_TEST_PUBLISH_CLOUDSMITH_TOKEN: ${{ secrets.UV_TEST_PUBLISH_CLOUDSMITH_TOKEN }}
           UV_TEST_PUBLISH_PYTHON_VERSION: ${{ env.PYTHON_VERSION }}
 
+  integration-uv-build-backend:
+    timeout-minutes: 10
+    needs: build-binary-linux-libc
+    name: "integration test | uv_build"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "${{ env.PYTHON_VERSION }}"
+
+      - name: "Download binary"
+        uses: actions/download-artifact@v4
+        with:
+          name: uv-linux-libc-${{ github.sha }}
+
+      - name: "Prepare binary"
+        run: |
+          chmod +x ./uv
+          chmod +x ./uvx
+
+      - name: "Test uv_build package"
+        run: |
+          # Build the Python package, which is not covered by uv's integration tests since they can't depend on having
+          # a Python package (only the binary itself is built before running Rust's tests)
+          ./uv build -v crates/uv-build
+
+          # Test the main path (`build_wheel`) through pip
+          ./uv venv -v --seed
+          ./uv run --no-project python -m pip install -v scripts/packages/built-by-uv --find-links crates/uv-build/dist --no-index --no-deps
+          ./uv run --no-project python -c "from built_by_uv import greet; print(greet())"
+
+          # Test both `build_wheel` and `build_sdist` through uv
+          ./uv venv -v
+          ./uv build -v --force-pep517 scripts/packages/built-by-uv --find-links crates/uv-build/dist --offline
+          ./uv pip install -v scripts/packages/built-by-uv/dist/*.tar.gz --find-links crates/uv-build/dist --offline --no-deps
+          ./uv run --no-project python -c "from built_by_uv import greet; print(greet())"
+
+          # Test both `build_wheel` and `build_sdist` through the official `build`
+          rm -rf scripts/packages/built-by-uv/dist/
+          ./uv venv -v
+          ./uv pip install build
+          # Add the uv binary to PATH for `build` to find
+          PATH="$(pwd):$PATH" UV_OFFLINE=1 UV_FIND_LINKS=crates/uv-build/dist ./uv run --no-project python -m build -v --installer uv scripts/packages/built-by-uv
+          ./uv pip install -v scripts/packages/built-by-uv/dist/*.tar.gz --find-links crates/uv-build/dist --offline --no-deps
+          ./uv run --no-project python -c "from built_by_uv import greet; print(greet())"
+
   cache-test-ubuntu:
     timeout-minutes: 10
     needs: build-binary-linux-libc

crates/uv-build/python/uv_build/__init__.py

@@ -60,7 +60,7 @@ def build_sdist(
     sdist_directory: str, config_settings: "Mapping[Any, Any] | None" = None
 ) -> str:
     """PEP 517 hook `build_sdist`."""
-    args = ["build-backend", "build-sdist", sdist_directory]
+    args = ["build-sdist", sdist_directory]
     return call(args, config_settings)
 
 
@@ -70,9 +70,9 @@ def build_wheel(
     metadata_directory: "str | None" = None,
 ) -> str:
     """PEP 517 hook `build_wheel`."""
-    args = ["build-backend", "build-wheel", wheel_directory]
+    args = ["build-wheel", wheel_directory]
     if metadata_directory:
-        args.extend(["--metadata-directory", metadata_directory])
+        args.extend([metadata_directory])
     return call(args, config_settings)
 
 
@@ -96,7 +96,7 @@ def prepare_metadata_for_build_wheel(
     metadata_directory: str, config_settings: "Mapping[Any, Any] | None" = None
 ) -> str:
     """PEP 517 hook `prepare_metadata_for_build_wheel`."""
-    args = ["build-backend", "prepare-metadata-for-build-wheel", metadata_directory]
+    args = ["prepare-metadata-for-build-wheel", metadata_directory]
     return call(args, config_settings)
 
 
@@ -106,9 +106,9 @@ def build_editable(
     metadata_directory: "str | None" = None,
 ) -> str:
     """PEP 660 hook `build_editable`."""
-    args = ["build-backend", "build-editable", wheel_directory]
+    args = ["build-editable", wheel_directory]
     if metadata_directory:
-        args.extend(["--metadata-directory", metadata_directory])
+        args.extend([metadata_directory])
     return call(args, config_settings)
 
 
@@ -124,5 +124,5 @@ def prepare_metadata_for_build_editable(
     metadata_directory: str, config_settings: "Mapping[Any, Any] | None" = None
 ) -> str:
     """PEP 660 hook `prepare_metadata_for_build_editable`."""
-    args = ["build-backend", "prepare-metadata-for-build-editable", metadata_directory]
+    args = ["prepare-metadata-for-build-editable", metadata_directory]
     return call(args, config_settings)