feat: option to build directly with uv

.github/workflows/test.yml

@@ -35,6 +35,7 @@ jobs:
     needs: lint
     runs-on: ${{ matrix.os }}
     strategy:
+      fail-fast: false
       matrix:
         os: [ubuntu-latest, ubuntu-24.04-arm, windows-latest, macos-13, macos-15]
         python_version: ['3.13']

bin/generate_schema.py

@@ -54,21 +54,23 @@
     type: string_array
   build-frontend:
     default: default
-    description: Set the tool to use to build, either "pip" (default for now), "build", or "build[uv]"
+    description: Set the tool to use to build, either "pip" (default for now), "build", "build[uv]", or "uv".
     oneOf:
-      - enum: [pip, build, "build[uv]", default]
+      - enum: [pip, build, "build[uv]", uv, default]
       - type: string
         pattern: '^pip; ?args:'
       - type: string
         pattern: '^build; ?args:'
       - type: string
         pattern: '^build\\[uv\\]; ?args:'
+      - type: string
+        pattern: '^uv; ?args:'
       - type: object
         additionalProperties: false
         required: [name]
         properties:
           name:
-            enum: [pip, build, "build[uv]"]
+            enum: [pip, build, "build[uv]", uv]
           args:
             type: array
             items:

cibuildwheel/frontend.py

@@ -7,7 +7,7 @@
 from .logger import log
 from .util.helpers import parse_key_value_string
 
-BuildFrontendName = Literal["pip", "build", "build[uv]"]
+BuildFrontendName = Literal["pip", "build", "build[uv]", "uv"]
 
 
 @dataclass(frozen=True)

cibuildwheel/platforms/ios.py

@@ -5,7 +5,7 @@
 import shutil
 import subprocess
 import sys
-from collections.abc import Sequence, Set
+from collections.abc import Set
 from dataclasses import dataclass
 from pathlib import Path
 from typing import assert_never
@@ -23,7 +23,6 @@
 from ..logger import log
 from ..options import Options
 from ..selector import BuildSelector
-from ..typing import PathOrStr
 from ..util import resources
 from ..util.cmd import call, shell
 from ..util.file import (
@@ -38,7 +37,7 @@
     find_compatible_wheel,
     get_pip_version,
 )
-from ..venv import virtualenv
+from ..venv import constraint_flags, virtualenv
 from .macos import install_cpython as install_build_cpython
 
 
@@ -150,7 +149,7 @@ def cross_virtualenv(
     multiarch: str,
     build_python: Path,
     venv_path: Path,
-    dependency_constraint_flags: Sequence[PathOrStr],
+    dependency_constraint: Path | None,
 ) -> dict[str, str]:
     """Create a cross-compilation virtual environment.
 
@@ -184,7 +183,7 @@ def cross_virtualenv(
         py_version,
         build_python,
         venv_path,
-        dependency_constraint_flags,
+        dependency_constraint,
         use_uv=False,
     )
 
@@ -236,11 +235,11 @@ def cross_virtualenv(
 def setup_python(
     tmp: Path,
     python_configuration: PythonConfiguration,
-    dependency_constraint_flags: Sequence[PathOrStr],
+    dependency_constraint: Path | None,
     environment: ParsedEnvironment,
     build_frontend: BuildFrontendName,
 ) -> tuple[Path, dict[str, str]]:
-    if build_frontend == "build[uv]":
+    if build_frontend == "build[uv]" or build_frontend == "uv":
         msg = "uv doesn't support iOS"
         raise errors.FatalError(msg)
 
@@ -283,14 +282,16 @@ def setup_python(
 
     log.step("Creating cross build environment...")
 
+    dependency_constraint_flags = constraint_flags(dependency_constraint)
+
     venv_path = tmp / "venv"
     env = cross_virtualenv(
         py_version=python_configuration.version,
         target_python=target_python,
         multiarch=python_configuration.multiarch,
         build_python=build_python,
         venv_path=venv_path,
-        dependency_constraint_flags=dependency_constraint_flags,
+        dependency_constraint=dependency_constraint,
     )
     venv_bin_path = venv_path / "bin"
     assert venv_bin_path.exists()
@@ -395,7 +396,7 @@ def build(options: Options, tmp_path: Path) -> None:
             build_options = options.build_options(config.identifier)
             build_frontend = build_options.build_frontend or BuildFrontendConfig("build")
             # uv doesn't support iOS
-            if build_frontend.name == "build[uv]":
+            if build_frontend.name == "build[uv]" or build_frontend.name == "uv":
                 msg = "uv doesn't support iOS"
                 raise errors.FatalError(msg)
 
@@ -408,14 +409,11 @@ def build(options: Options, tmp_path: Path) -> None:
             constraints_path = build_options.dependency_constraints.get_for_python_version(
                 version=config.version, tmp_dir=identifier_tmp_dir
             )
-            dependency_constraint_flags: Sequence[PathOrStr] = (
-                ["-c", constraints_path] if constraints_path else []
-            )
 
             target_install_path, env = setup_python(
                 identifier_tmp_dir / "build",
                 config,
-                dependency_constraint_flags,
+                constraints_path,
                 build_options.environment,
                 build_frontend.name,
             )

cibuildwheel/platforms/linux.py

@@ -204,7 +204,7 @@ def build_in_container(
         local_identifier_tmp_dir = local_tmp_dir / config.identifier
         build_options = options.build_options(config.identifier)
         build_frontend = build_options.build_frontend or BuildFrontendConfig("build")
-        use_uv = build_frontend.name == "build[uv]"
+        use_uv = build_frontend.name in {"build[uv]", "uv"}
         pip = ["uv", "pip"] if use_uv else ["pip"]
 
         log.step("Setting up build environment...")
@@ -303,6 +303,19 @@ def build_in_container(
                     ],
                     env=env,
                 )
+            elif build_frontend.name == "uv":
+                container.call(
+                    [
+                        "uv",
+                        "build",
+                        "--python=python",
+                        container_package_dir,
+                        "--wheel",
+                        f"--out-dir={built_wheel_dir}",
+                        *extra_flags,
+                    ],
+                    env=env,
+                )
             else:
                 assert_never(build_frontend)
 

cibuildwheel/platforms/macos.py

@@ -7,7 +7,7 @@
 import subprocess
 import sys
 import typing
-from collections.abc import Sequence, Set
+from collections.abc import Set
 from dataclasses import dataclass
 from pathlib import Path
 from typing import Literal, assert_never
@@ -23,7 +23,6 @@
 from ..logger import log
 from ..options import Options
 from ..selector import BuildSelector
-from ..typing import PathOrStr
 from ..util import resources
 from ..util.cmd import call, shell
 from ..util.file import (
@@ -34,7 +33,7 @@
 )
 from ..util.helpers import prepare_command, unwrap
 from ..util.packaging import combine_constraints, find_compatible_wheel, get_pip_version
-from ..venv import find_uv, virtualenv
+from ..venv import constraint_flags, find_uv, virtualenv
 
 
 @functools.cache
@@ -195,7 +194,7 @@ def install_pypy(tmp: Path, url: str) -> Path:
 def setup_python(
     tmp: Path,
     python_configuration: PythonConfiguration,
-    dependency_constraint_flags: Sequence[PathOrStr],
+    dependency_constraint: Path | None,
     environment: ParsedEnvironment,
     build_frontend: BuildFrontendName,
 ) -> tuple[Path, dict[str, str]]:
@@ -220,13 +219,15 @@ def setup_python(
         f"{base_python.name} not found, has {list(base_python.parent.iterdir())}"
     )
 
+    dependency_constraint_flags = constraint_flags(dependency_constraint)
+
     log.step("Setting up build environment...")
     venv_path = tmp / "venv"
     env = virtualenv(
         python_configuration.version,
         base_python,
         venv_path,
-        dependency_constraint_flags,
+        dependency_constraint,
         use_uv=use_uv,
     )
     venv_bin_path = venv_path / "bin"
@@ -376,6 +377,17 @@ def setup_python(
             *dependency_constraint_flags,
             env=env,
         )
+    elif build_frontend == "uv":
+        assert uv_path is not None
+        call(
+            uv_path,
+            "pip",
+            "install",
+            "--upgrade",
+            "delocate",
+            *dependency_constraint_flags,
+            env=env,
+        )
     else:
         assert_never(build_frontend)
 
@@ -408,7 +420,7 @@ def build(options: Options, tmp_path: Path) -> None:
         for config in python_configurations:
             build_options = options.build_options(config.identifier)
             build_frontend = build_options.build_frontend or BuildFrontendConfig("build")
-            use_uv = build_frontend.name == "build[uv]"
+            use_uv = build_frontend.name in {"build[uv]", "uv"}
             uv_path = find_uv()
             if use_uv and uv_path is None:
                 msg = "uv not found"
@@ -427,14 +439,12 @@ def build(options: Options, tmp_path: Path) -> None:
             constraints_path = build_options.dependency_constraints.get_for_python_version(
                 version=config.version, tmp_dir=identifier_tmp_dir
             )
-            dependency_constraint_flags: Sequence[PathOrStr] = (
-                ["-c", constraints_path] if constraints_path else []
-            )
+            dependency_constraint_flags = constraint_flags(constraints_path)
 
             base_python, env = setup_python(
                 identifier_tmp_dir / "build",
                 config,
-                dependency_constraint_flags,
+                constraints_path,
                 build_options.environment,
                 build_frontend.name,
             )
@@ -498,6 +508,17 @@ def build(options: Options, tmp_path: Path) -> None:
                         *extra_flags,
                         env=build_env,
                     )
+                elif build_frontend.name == "uv":
+                    call(
+                        "uv",
+                        "build",
+                        "--python=python",
+                        build_options.package_dir,
+                        "--wheel",
+                        f"--out-dir={built_wheel_dir}",
+                        *extra_flags,
+                        env=build_env,
+                    )
                 else:
                     assert_never(build_frontend)
 

cibuildwheel/platforms/pyodide.py

@@ -152,7 +152,7 @@ def setup_python(
 
     log.step("Setting up build environment...")
     venv_path = tmp / "venv"
-    env = virtualenv(python_configuration.version, base_python, venv_path, [], use_uv=False)
+    env = virtualenv(python_configuration.version, base_python, venv_path, None, use_uv=False)
     venv_bin_path = venv_path / "bin"
     assert venv_bin_path.exists()
     env["PIP_DISABLE_PIP_VERSION_CHECK"] = "1"
@@ -269,8 +269,8 @@ def build(options: Options, tmp_path: Path) -> None:
             constraints_path = build_options.dependency_constraints.get_for_python_version(
                 version=config.version, variant="pyodide", tmp_dir=identifier_tmp_dir
             )
-            dependency_constraint_flags: Sequence[PathOrStr] = (
-                ["-c", constraints_path] if constraints_path else []
+            dependency_constraint_flags = (
+                ["-c", constraints_path.as_uri()] if constraints_path else []
             )
 
             env = setup_python(