pylock: move toml export function to utils

Author: sbidoul

src/pip/_internal/commands/lock.py

@@ -19,7 +19,7 @@
 from pip._internal.utils.misc import (
     get_pip_version,
 )
-from pip._internal.utils.pylock import pylock_from_install_requirements
+from pip._internal.utils.pylock import pylock_from_install_requirements, pylock_to_toml
 from pip._internal.utils.temp_dir import TempDirectory
 
 logger = getLogger(__name__)
@@ -161,9 +161,10 @@ def run(self, options: Values, args: List[str]) -> int:
                     output_file_path,
                 )
             base_dir = output_file_path.parent
-        pylock_toml = pylock_from_install_requirements(
+        pylock = pylock_from_install_requirements(
             requirement_set.requirements.values(), base_dir=base_dir
-        ).as_toml()
+        )
+        pylock_toml = pylock_to_toml(pylock)
         if options.output_file == "-":
             sys.stdout.write(pylock_toml)
         else:

src/pip/_internal/models/pylock.py

@@ -19,7 +19,6 @@
     Union,
 )
 
-from pip._vendor import tomli_w
 from pip._vendor.packaging.markers import Marker
 from pip._vendor.packaging.specifiers import SpecifierSet
 from pip._vendor.packaging.version import Version
@@ -416,9 +415,6 @@ def __post_init__(self) -> None:
                 "pylock minor version %s is not supported", self.lock_version
             )
 
-    def as_toml(self) -> str:
-        return tomli_w.dumps(self.to_dict())
-
     def to_dict(self) -> Dict[str, Any]:
         return dataclasses.asdict(self, dict_factory=_toml_dict_factory)
 

src/pip/_internal/utils/pylock.py

@@ -1,6 +1,7 @@
 from pathlib import Path
 from typing import Iterable
 
+from pip._vendor import tomli_w
 from pip._vendor.packaging.version import Version
 
 from pip._internal.models.direct_url import ArchiveInfo, DirInfo, VcsInfo
@@ -133,3 +134,7 @@ def pylock_from_install_requirements(
         ),
         tool=None,
     )
+
+
+def pylock_to_toml(pylock: Pylock) -> str:
+    return tomli_w.dumps(pylock.to_dict())

tests/unit/test_utils_pylock.py

@@ -0,0 +1,65 @@
+from textwrap import dedent
+
+from pip._vendor import tomli_w
+
+from pip._internal.models.pylock import Pylock
+from pip._internal.utils.compat import tomllib
+from pip._internal.utils.pylock import pylock_to_toml
+
+# This is the PEP 751 example, with a minor modification to the 'environments'
+# field to use double quotes instead of single quotes, since that is what
+# 'packaging' does when serializing markers.
+
+PEP751_EXAMPLE = dedent(
+    """\
+    lock-version = '1.0'
+    environments = ["sys_platform == \\"win32\\"", "sys_platform == \\"linux\\""]
+    requires-python = '==3.12'
+    created-by = 'mousebender'
+
+    [[packages]]
+    name = 'attrs'
+    version = '25.1.0'
+    requires-python = '>=3.8'
+    wheels = [
+    {name = 'attrs-25.1.0-py3-none-any.whl', upload-time = 2025-01-25T11:30:10.164985+00:00, url = 'https://files.pythonhosted.org/packages/fc/30/d4986a882011f9df997a55e6becd864812ccfcd821d64aac8570ee39f719/attrs-25.1.0-py3-none-any.whl', size = 63152, hashes = {sha256 = 'c75a69e28a550a7e93789579c22aa26b0f5b83b75dc4e08fe092980051e1090a'}},
+    ]
+    [[packages.attestation-identities]]
+    environment = 'release-pypi'
+    kind = 'GitHub'
+    repository = 'python-attrs/attrs'
+    workflow = 'pypi-package.yml'
+
+    [[packages]]
+    name = 'cattrs'
+    version = '24.1.2'
+    requires-python = '>=3.8'
+    dependencies = [
+        {name = 'attrs'},
+    ]
+    wheels = [
+    {name = 'cattrs-24.1.2-py3-none-any.whl', upload-time = 2024-09-22T14:58:34.812643+00:00, url = 'https://files.pythonhosted.org/packages/c8/d5/867e75361fc45f6de75fe277dd085627a9db5ebb511a87f27dc1396b5351/cattrs-24.1.2-py3-none-any.whl', size = 66446, hashes = {sha256 = '67c7495b760168d931a10233f979b28dc04daf853b30752246f4f8471c6d68d0'}},
+    ]
+
+    [[packages]]
+    name = 'numpy'
+    version = '2.2.3'
+    requires-python = '>=3.10'
+    wheels = [
+    {name = 'numpy-2.2.3-cp312-cp312-win_amd64.whl', upload-time = 2025-02-13T16:51:21.821880+00:00, url = 'https://files.pythonhosted.org/packages/42/6e/55580a538116d16ae7c9aa17d4edd56e83f42126cb1dfe7a684da7925d2c/numpy-2.2.3-cp312-cp312-win_amd64.whl', size = 12626357, hashes = {sha256 = '83807d445817326b4bcdaaaf8e8e9f1753da04341eceec705c001ff342002e5d'}},
+    {name = 'numpy-2.2.3-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.whl', upload-time = 2025-02-13T16:50:00.079662+00:00, url = 'https://files.pythonhosted.org/packages/39/04/78d2e7402fb479d893953fb78fa7045f7deb635ec095b6b4f0260223091a/numpy-2.2.3-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.whl', size = 16116679, hashes = {sha256 = '3b787adbf04b0db1967798dba8da1af07e387908ed1553a0d6e74c084d1ceafe'}},
+    ]
+
+    [tool.mousebender]
+    command = ['.', 'lock', '--platform', 'cpython3.12-windows-x64', '--platform', 'cpython3.12-manylinux2014-x64', 'cattrs', 'numpy']
+    run-on = 2025-03-06T12:28:57.760769
+    """  # noqa: E501
+)
+
+
+def test_toml_roundtrip() -> None:
+    pylock_dict = tomllib.loads(PEP751_EXAMPLE)
+    pylock = Pylock.from_dict(pylock_dict)
+    # Check that the roundrip via Pylock dataclasses produces the same toml
+    # output, modulo TOML serialization differences.
+    assert pylock_to_toml(pylock) == tomli_w.dumps(pylock_dict)