Define %python3_cache_tag / %python_cache_tag, e.g. cpython-311

When reviewing https://src.fedoraproject.org/rpms/pyproject-rpm-macros/pull-request/291
we have discovered that there is no macronized way to get this part of some paths
and that packagers need to hardcode it as cpython-%{python3_version_nodots}.

This way, we have a standardized macro packagers (and other macros) can use.

macros.python

@@ -9,6 +9,7 @@
 %python_platform %(RPM_BUILD_ROOT= %{__python} -Esc "import sysconfig; print(sysconfig.get_platform())")
 %python_platform_triplet %(RPM_BUILD_ROOT= %{__python} -Esc "import sysconfig; print(sysconfig.get_config_var('MULTIARCH'))")
 %python_ext_suffix %(RPM_BUILD_ROOT= %{__python} -Esc "import sysconfig; print(sysconfig.get_config_var('EXT_SUFFIX'))")
+%python_cache_tag %(RPM_BUILD_ROOT= %{__python} -Esc "import sys; print(sys.implementation.cache_tag)")
 
 %py_setup setup.py
 %py_shbang_opts -s

macros.python3

@@ -7,6 +7,7 @@
 %python3_platform %(RPM_BUILD_ROOT= %{__python3} -Ic "import sysconfig; print(sysconfig.get_platform())")
 %python3_platform_triplet %(RPM_BUILD_ROOT= %{__python3} -Ic "import sysconfig; print(sysconfig.get_config_var('MULTIARCH'))")
 %python3_ext_suffix %(RPM_BUILD_ROOT= %{__python3} -Ic "import sysconfig; print(sysconfig.get_config_var('EXT_SUFFIX'))")
+%python3_cache_tag %(RPM_BUILD_ROOT= %{__python3} -Ic "import sys; print(sys.implementation.cache_tag)")
 %py3dir %{_builddir}/python3-%{name}-%{version}-%{release}
 
 %py3_shbang_opts -s
@@ -102,6 +103,7 @@
     pyminor = path:match("/python3.(%d+)/") or "*"
     dirname = path:match("(.*/)")
     modulename = path:match(".*/([^/]+).py")
+    -- %%python3_cache_tag is not used here because this macro supports not-installed CPythons
     print("\\n" .. dirname .. "__pycache__/" .. modulename .. ".cpython-3" .. pyminor .. "{,.opt-?}.pyc")
   end
 }

python-rpm-macros.spec

@@ -49,7 +49,7 @@ elseif posix.stat('macros.python-srpm') then
 end
 }
 Version:        %{__default_python3_version}
-Release:        11%{?dist}
+Release:        12%{?dist}
 
 
 BuildArch:      noarch
@@ -146,6 +146,9 @@ install -m 755 brp-* %{buildroot}%{_rpmconfigdir}/redhat/
 
 
 %changelog
+* Tue Jul 19 2022 Miro Hrončok <mhroncok@redhat.com> - 3.10-12
+- Define %%python3_cache_tag / %%python_cache_tag, e.g. cpython-311
+
 * Mon Feb 07 2022 Miro Hrončok <mhroncok@redhat.com> - 3.10-11
 - Set $RPM_BUILD_ROOT in %%{python3_...} macros
   to allow selecting alternate sysconfig install scheme based on that variable

tests/test_evals.py

@@ -560,6 +560,7 @@ unversioned_macros = pytest.mark.parametrize('macro', [
     '%python_platform',
     '%python_platform_triplet',
     '%python_ext_suffix',
+    '%python_cache_tag',
     '%py_shebang_fix',
     '%py_build',
     '%py_build_egg',
@@ -598,6 +599,18 @@ def test_ext_suffix():
     assert rpm_eval("%python3_ext_suffix") == [f".cpython-{XY}-x86_64-linux-gnu.so"]
 
 
+def test_cache_tag():
+    assert rpm_eval("%python3_cache_tag") == [f"cpython-{XY}"]
+
+
+def test_cache_tag_alternate_python():
+    assert rpm_eval("%python_cache_tag", __python=f"/usr/bin/python3.6") == [f"cpython-36"]
+
+
+def test_cache_tag_alternate_python3():
+    assert rpm_eval("%python3_cache_tag", __python3=f"/usr/bin/python3.6") == [f"cpython-36"]
+
+
 def test_python_sitelib_value():
     macro = '%python_sitelib'
     assert rpm_eval(macro, __python='/usr/bin/python3.6') == [f'/usr/lib/python3.6/site-packages']