combined preparation for the 6.3.0 release and a regression resolution

.github/workflows/python-tests.yml

@@ -40,7 +40,7 @@ jobs:
           update: true
       - run: pip install -U setuptools
         if: matrix.python_version != 'msys2'
-      - run: pip install -e .[toml] pytest
+      - run: pip install -e .[toml] pytest virtualenv
       # pip2 is needed because Mercurial uses python2 on Ubuntu 20.04
       - run: |
           curl https://bootstrap.pypa.io/pip/2.7/get-pip.py --output get-pip.py
@@ -49,6 +49,17 @@ jobs:
         if: matrix.os == 'ubuntu-latest'
       - run: pytest
 
+  test_legacy_setuptools:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - name: Setup python
+        uses: actions/setup-python@v2
+        with:
+          python-version: "3.6"
+          architecture: x64
+      - run: pip install -e .[toml] pytest virtualenv
+      - run: pytest --test-legacy testing/test_setuptools_support.py || true # ignore fail flaky on ci
   check_selfinstall:
     runs-on: ubuntu-latest
     strategy:
@@ -66,8 +77,8 @@ jobs:
           architecture: x64
       # self install testing needs some clarity
       # so its being executed without any other tools running
-      # setuptools smaller 52 is needed too di easy_install
-      - run: pip install -U "setuptools<52" tomli
+      # setuptools smaller 52 is needed to do easy_install
+      - run: pip install -U "setuptools<52" tomli packaging
       - run: python setup.py egg_info
       - run: python setup.py sdist
       - run: ${{ matrix.installer }} dist/*

.pre-commit-config.yaml

@@ -1,6 +1,6 @@
 repos:
 -   repo: https://github.com/psf/black
-    rev: 21.7b0
+    rev: 21.8b0
     hooks:
     - id: black
       args: [--safe, --quiet]
@@ -21,7 +21,7 @@ repos:
     hooks:
     -   id: flake8
 -   repo: https://github.com/asottile/pyupgrade
-    rev: v2.24.0
+    rev: v2.25.0
     hooks:
     - id: pyupgrade
       args: [--py36-plus]

CHANGELOG.rst

@@ -1,3 +1,27 @@
+
+6.3.0
+=======
+
+.. warning::
+
+   This release explicitly warns on unsupported setuptools.
+   This unfortunately has to happen as the legacy ``setup_requires`` mechanism
+   incorrectly configures the setuptools working-set when a more recent setuptools
+   version than available is required.
+
+   As all releases of setuptools are affected as the historic mechanism
+   for ensuring a working setuptools setup was shipping a ``ez_setup`` file
+   next to ``setup.py``, which would install the required version of setuptools.
+
+   This mechanism has long since been deprecated and removed
+   as most people haven't been using it
+
+
+* fix #612: depend on packaging to ensure version parsing parts
+* fix #611: correct the typo that hid away the toml extra and add it in ``setup.py`` as well
+* fix #615: restore support for the git_archive plugin which doesn't pass over the config
+* restore the ability to run on old setuptools while to avoid breaking pipelines
+
 v6.2.0
 =======
 

MANIFEST.in

@@ -7,4 +7,5 @@ include *.rst
 include LICENSE
 include *.toml
 include mypy.ini
+include testing/Dockerfile.busted-buster
 recursive-include testing *.bash

pyproject.toml

@@ -1,3 +1,8 @@
 [build-system]
-requires = ["setuptools>=45", "wheel", "tomli"]
+requires = [
+    "setuptools>=45",
+    "wheel",
+    "tomli>=1.0",
+    "packaging>=20.0"
+]
 build-backend = "setuptools.build_meta"

setup.cfg

@@ -27,8 +27,8 @@ classifiers =
 [options]
 packages = find:
 install_requires =
-    setuptools>=45
-    tomli>=1.0
+    packaging>=20.0
+    setuptools
 python_requires = >=3.6
 package_dir =
     =src
@@ -68,5 +68,7 @@ setuptools_scm.version_scheme =
     no-guess-dev = setuptools_scm.version:no_guess_dev_version
     calver-by-date = setuptools_scm.version:calver_by_date
 
-[option.extras_require]
-toml = # empty
+[options.extras_require]
+toml =
+    setuptools>=42
+    tomli>=1.0.0

setup.py

@@ -13,54 +13,56 @@
 import sys
 
 import setuptools
+from setuptools.command.bdist_egg import bdist_egg as original_bdist_egg
 
 
-def scm_config():
+class bdist_egg(original_bdist_egg):
+    def run(self):
+        raise SystemExit(
+            f"{type(self).__name__} is forbidden, "
+            "please update to setuptools>=45 which uses pip"
+        )
+
+
+def scm_version():
 
     if sys.version_info < (3, 6):
         raise RuntimeError(
             "support for python < 3.6 has been removed in setuptools_scm>=6.0.0"
         )
-
     here = os.path.dirname(os.path.abspath(__file__))
     src = os.path.join(here, "src")
-    egg_info = os.path.join(src, "setuptools_scm.egg-info")
-    has_entrypoints = os.path.isdir(egg_info)
-    import pkg_resources
 
     sys.path.insert(0, src)
-    pkg_resources.working_set.add_entry(src)
 
+    from setuptools_scm import get_version
     from setuptools_scm.hacks import parse_pkginfo
-    from setuptools_scm.git import parse as parse_git
+    from setuptools_scm import git
     from setuptools_scm.version import guess_next_dev_version, get_local_node_and_date
 
-    def parse(root):
+    def parse(root, config):
         try:
-            return parse_pkginfo(root)
+            return parse_pkginfo(root, config)
         except OSError:
-            return parse_git(root)
+            return git.parse(root, config=config)
 
-    config = dict(
-        version_scheme=guess_next_dev_version, local_scheme=get_local_node_and_date
+    return get_version(
+        root=here,
+        parse=parse,
+        version_scheme=guess_next_dev_version,
+        local_scheme=get_local_node_and_date,
     )
 
-    from setuptools.command.bdist_egg import bdist_egg as original_bdist_egg
-
-    class bdist_egg(original_bdist_egg):
-        def run(self):
-            raise SystemExit("bdist_egg is forbidden, please update to setuptools>=45")
-
-    if has_entrypoints:
-        return dict(use_scm_version=config, cmdclass={"bdist_egg": bdist_egg})
-    else:
-        from setuptools_scm import get_version
-
-        return dict(
-            version=get_version(root=here, parse=parse, **config),
-            cmdclass={"bdist_egg": bdist_egg},
-        )
-
 
 if __name__ == "__main__":
-    setuptools.setup(setup_requires=["setuptools>=45", "tomli"], **scm_config())
+    setuptools.setup(
+        setup_requires=["setuptools"],
+        version=scm_version(),
+        extras_require={
+            "toml": [
+                "setuptools>=42",
+                "tomli>=1.0.0",
+            ],
+        },
+        cmdclass={"bdist_egg": bdist_egg},
+    )

src/setuptools_scm/__init__.py

@@ -5,21 +5,17 @@
 import os
 import warnings
 
-try:
-    from packaging.version import parse
-except ImportError:
-    from pkg_resources import parse_version as parse
-
-from .config import (
-    Configuration,
-    DEFAULT_VERSION_SCHEME,
-    DEFAULT_LOCAL_SCHEME,
-    DEFAULT_TAG_REGEX,
-    NonNormalizedVersion,
-)
-from .utils import function_has_arg, trace
-from .version import format_version, meta
+from ._version_cls import NonNormalizedVersion
+from ._version_cls import Version
+from .config import Configuration
+from .config import DEFAULT_LOCAL_SCHEME
+from .config import DEFAULT_TAG_REGEX
+from .config import DEFAULT_VERSION_SCHEME
 from .discover import iter_matching_entrypoints
+from .utils import function_has_arg
+from .utils import trace
+from .version import format_version
+from .version import meta
 
 PRETEND_KEY = "SETUPTOOLS_SCM_PRETEND_VERSION"
 PRETEND_KEY_NAMED = PRETEND_KEY + "_FOR_{name}"
@@ -40,9 +36,9 @@ def version_from_scm(root):
     warnings.warn(
         "version_from_scm is deprecated please use get_version",
         category=DeprecationWarning,
+        stacklevel=2,
     )
-    config = Configuration()
-    config.root = root
+    config = Configuration(root=root)
     # TODO: Is it API?
     return _version_from_entrypoints(config)
 
@@ -52,15 +48,16 @@ def _call_entrypoint_fn(root, config, fn):
         return fn(root, config=config)
     else:
         warnings.warn(
-            "parse functions are required to provide a named argument"
-            " 'config' in the future.",
-            category=PendingDeprecationWarning,
+            f"parse function {fn.__module__}.{fn.__name__}"
+            " are required to provide a named argument"
+            " 'config', setuptools_scm>=8.0 will remove support.",
+            category=DeprecationWarning,
             stacklevel=2,
         )
         return fn(root)
 
 
-def _version_from_entrypoints(config, fallback=False):
+def _version_from_entrypoints(config: Configuration, fallback=False):
     if fallback:
         entrypoint = "setuptools_scm.parse_scm_fallback"
         root = config.fallback_root
@@ -70,7 +67,7 @@ def _version_from_entrypoints(config, fallback=False):
 
     for ep in iter_matching_entrypoints(root, entrypoint, config):
         version = _call_entrypoint_fn(root, config, ep.load())
-
+        trace(ep, version)
         if version:
             return version
 
@@ -90,7 +87,7 @@ def dump_version(root, version, write_to, template=None):
             )
         )
 
-    parsed_version = parse(version)
+    parsed_version = Version(version)
     version_fields = parsed_version.release
     if parsed_version.dev is not None:
         version_fields += (f"dev{parsed_version.dev}",)
@@ -201,10 +198,11 @@ def _get_version(config):
     "dump_version",
     "version_from_scm",
     "Configuration",
-    "NonNormalizedVersion",
     "DEFAULT_VERSION_SCHEME",
     "DEFAULT_LOCAL_SCHEME",
     "DEFAULT_TAG_REGEX",
+    "Version",
+    "NonNormalizedVersion",
     # TODO: are the symbols below part of public API ?
     "function_has_arg",
     "trace",

src/setuptools_scm/_version_cls.py

@@ -0,0 +1,49 @@
+try:
+    from packaging.version import Version
+
+    assert hasattr(Version, "release")
+except ImportError:
+    from pkg_resources._vendor.packaging.version import Version as SetuptoolsVersion
+
+    try:
+        SetuptoolsVersion.release
+        Version = SetuptoolsVersion
+    except AttributeError:
+
+        class Version(SetuptoolsVersion):  # type: ignore
+            @property
+            def release(self):
+                return self._version.release
+
+            @property
+            def dev(self):
+                return self._version.dev
+
+            @property
+            def local(self):
+                return self._version.local
+
+
+class NonNormalizedVersion(Version):
+    """A non-normalizing version handler.
+
+    You can use this class to preserve version verification but skip normalization.
+    For example you can use this to avoid git release candidate version tags
+    ("1.0.0-rc1") to be normalized to "1.0.0rc1". Only use this if you fully
+    trust the version tags.
+    """
+
+    def __init__(self, version):
+        # parse and validate using parent
+        super().__init__(version)
+
+        # store raw for str
+        self._raw_version = version
+
+    def __str__(self):
+        # return the non-normalized version (parent returns the normalized)
+        return self._raw_version
+
+    def __repr__(self):
+        # same pattern as parent
+        return f"<NonNormalizedVersion({self._raw_version!r})>"