Bug 2417963

Description of problem:
We want to update pip from 25.2 to 25.3 in Rawhide but python-setuptools fails to build:

https://copr.fedorainfracloud.org/coprs/churchyard/pip-25.3/package/python-setuptools/


=================================== FAILURES ===================================
__________________________ test_dist_fetch_build_egg ___________________________

dist = <setuptools.dist.Distribution object at 0x7fb71ce58690>
req = <Requirement('barbazquux-runner')>

    def _fetch_build_egg_no_warn(dist, req):  # noqa: C901  # is too complex (16)  # FIXME
        # Ignore environment markers; if supplied, it is required.
        req = strip_marker(req)
        # Take easy_install options into account, but do not override relevant
        # pip environment variables (like PIP_INDEX_URL or PIP_QUIET); they'll
        # take precedence.
        opts = dist.get_option_dict('easy_install')
        if 'allow_hosts' in opts:
            raise DistutilsError(
                'the `allow-hosts` option is not supported '
                'when using pip to install requirements.'
            )
        quiet = 'PIP_QUIET' not in os.environ and 'PIP_VERBOSE' not in os.environ
        if 'PIP_INDEX_URL' in os.environ:
            index_url = None
        elif 'index_url' in opts:
            index_url = opts['index_url'][1]
        else:
            index_url = None
        find_links = (
            _fixup_find_links(opts['find_links'][1])[:] if 'find_links' in opts else []
        )
        if dist.dependency_links:
            find_links.extend(dist.dependency_links)
        eggs_dir = os.path.realpath(dist.get_egg_cache_dir())
        cached_dists = metadata.Distribution.discover(path=glob.glob(f'{eggs_dir}/*.egg'))
        for egg_dist in cached_dists:
            if _dist_matches_req(egg_dist, req):
                return egg_dist
        with tempfile.TemporaryDirectory() as tmpdir:
            cmd = [
                sys.executable,
                '-m',
                'pip',
                '--disable-pip-version-check',
                'wheel',
                '--no-deps',
                '-w',
                tmpdir,
            ]
            if quiet:
                cmd.append('--quiet')
            if index_url is not None:
                cmd.extend(('--index-url', index_url))
            for link in find_links or []:
                cmd.extend(('--find-links', link))
            # If requirement is a PEP 508 direct URL, directly pass
            # the URL to pip, as `req @ url` does not work on the
            # command line.
            cmd.append(req.url or str(req))
            try:
>               subprocess.check_call(cmd)

setuptools/installer.py:121: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

popenargs = (['/usr/bin/python3', '-m', 'pip', '--disable-pip-version-check', 'wheel', '--no-deps', ...],)
kwargs = {}, retcode = 1
cmd = ['/usr/bin/python3', '-m', 'pip', '--disable-pip-version-check', 'wheel', '--no-deps', ...]

    def check_call(*popenargs, **kwargs):
        """Run command with arguments.  Wait for command to complete.  If
        the exit code was zero then return, otherwise raise
        CalledProcessError.  The CalledProcessError object will have the
        return code in the returncode attribute.
    
        The arguments are the same as for the call function.  Example:
    
        check_call(["ls", "-l"])
        """
        retcode = call(*popenargs, **kwargs)
        if retcode:
            cmd = kwargs.get("args")
            if cmd is None:
                cmd = popenargs[0]
>           raise CalledProcessError(retcode, cmd)
E           subprocess.CalledProcessError: Command '['/usr/bin/python3', '-m', 'pip', '--disable-pip-version-check', 'wheel', '--no-deps', '-w', '/tmp/tmpr5pew8t3', '--quiet', '--index-url', 'file:///tmp/pytest-of-mockbuild/pytest-0/test_dist_fetch_build_egg0/index', 'barbazquux-runner']' returned non-zero exit status 1.

/usr/lib64/python3.14/subprocess.py:419: CalledProcessError

The above exception was the direct cause of the following exception:

tmpdir = local('/tmp/pytest-of-mockbuild/pytest-0/test_dist_fetch_build_egg0')

    def test_dist_fetch_build_egg(tmpdir):
        """
        Check multiple calls to `Distribution.fetch_build_egg` work as expected.
        """
        index = tmpdir.mkdir('index')
        index_url = urllib.parse.urljoin('file://', urllib.request.pathname2url(str(index)))
    
        def sdist_with_index(distname, version):
            dist_dir = index.mkdir(distname)
            dist_sdist = f'{distname}-{version}.tar.gz'
            make_trivial_sdist(str(dist_dir.join(dist_sdist)), distname, version)
            with dist_dir.join('index.html').open('w') as fp:
                fp.write(
                    DALS(
                        """
                    <!DOCTYPE html><html><body>
                    <a href="{dist_sdist}" rel="internal">{dist_sdist}</a><br/>
                    </body></html>
                    """
                    ).format(dist_sdist=dist_sdist)
                )
    
        sdist_with_index('barbazquux', '3.2.0')
        sdist_with_index('barbazquux-runner', '2.11.1')
        with tmpdir.join('setup.cfg').open('w') as fp:
            fp.write(
                DALS(
                    """
                [easy_install]
                index_url = {index_url}
                """
                ).format(index_url=index_url)
            )
        reqs = """
        barbazquux-runner
        barbazquux
        """.split()
        with tmpdir.as_cwd():
            dist = Distribution()
            dist.parse_config_files()
>           resolved_dists = [dist.fetch_build_egg(r) for r in reqs]
                              ^^^^^^^^^^^^^^^^^^^^^^^

setuptools/tests/test_dist.py:58: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
setuptools/dist.py:831: in fetch_build_egg
    return fetch_build_egg(self, req)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
setuptools/installer.py:36: in fetch_build_egg
    return _fetch_build_egg_no_warn(dist, req)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dist = <setuptools.dist.Distribution object at 0x7fb71ce58690>
req = <Requirement('barbazquux-runner')>

    def _fetch_build_egg_no_warn(dist, req):  # noqa: C901  # is too complex (16)  # FIXME
        # Ignore environment markers; if supplied, it is required.
        req = strip_marker(req)
        # Take easy_install options into account, but do not override relevant
        # pip environment variables (like PIP_INDEX_URL or PIP_QUIET); they'll
        # take precedence.
        opts = dist.get_option_dict('easy_install')
        if 'allow_hosts' in opts:
            raise DistutilsError(
                'the `allow-hosts` option is not supported '
                'when using pip to install requirements.'
            )
        quiet = 'PIP_QUIET' not in os.environ and 'PIP_VERBOSE' not in os.environ
        if 'PIP_INDEX_URL' in os.environ:
            index_url = None
        elif 'index_url' in opts:
            index_url = opts['index_url'][1]
        else:
            index_url = None
        find_links = (
            _fixup_find_links(opts['find_links'][1])[:] if 'find_links' in opts else []
        )
        if dist.dependency_links:
            find_links.extend(dist.dependency_links)
        eggs_dir = os.path.realpath(dist.get_egg_cache_dir())
        cached_dists = metadata.Distribution.discover(path=glob.glob(f'{eggs_dir}/*.egg'))
        for egg_dist in cached_dists:
            if _dist_matches_req(egg_dist, req):
                return egg_dist
        with tempfile.TemporaryDirectory() as tmpdir:
            cmd = [
                sys.executable,
                '-m',
                'pip',
                '--disable-pip-version-check',
                'wheel',
                '--no-deps',
                '-w',
                tmpdir,
            ]
            if quiet:
                cmd.append('--quiet')
            if index_url is not None:
                cmd.extend(('--index-url', index_url))
            for link in find_links or []:
                cmd.extend(('--find-links', link))
            # If requirement is a PEP 508 direct URL, directly pass
            # the URL to pip, as `req @ url` does not work on the
            # command line.
            cmd.append(req.url or str(req))
            try:
                subprocess.check_call(cmd)
            except subprocess.CalledProcessError as e:
>               raise DistutilsError(str(e)) from e
E               distutils.errors.DistutilsError: Command '['/usr/bin/python3', '-m', 'pip', '--disable-pip-version-check', 'wheel', '--no-deps', '-w', '/tmp/tmpr5pew8t3', '--quiet', '--index-url', 'file:///tmp/pytest-of-mockbuild/pytest-0/test_dist_fetch_build_egg0/index', 'barbazquux-runner']' returned non-zero exit status 1.

setuptools/installer.py:123: DistutilsError
----------------------------- Captured stderr call -----------------------------
  error: subprocess-exited-with-error
  
  × installing build dependencies for barbazquux-runner did not run successfully.
  │ exit code: 1
  ╰─> [4 lines of output]
      Looking in indexes: file:///tmp/pytest-of-mockbuild/pytest-0/test_dist_fetch_build_egg0/index
      WARNING: Location 'file:///tmp/pytest-of-mockbuild/pytest-0/test_dist_fetch_build_egg0/index/setuptools/' is ignored: it is neither a file nor a directory.
      ERROR: Could not find a version that satisfies the requirement setuptools>=40.8.0 (from versions: none)
      ERROR: No matching distribution found for setuptools>=40.8.0
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
ERROR: Failed to build 'barbazquux-runner' when installing build dependencies for barbazquux-runner
_________________ TestNamespaces.test_mixed_site_and_non_site __________________

self = <setuptools.tests.test_namespaces.TestNamespaces object at 0x7fb71ee5a0d0>
tmpdir = local('/tmp/pytest-of-mockbuild/pytest-0/test_mixed_site_and_non_site0')

    def test_mixed_site_and_non_site(self, tmpdir):
        """
        Installing two packages sharing the same namespace, one installed
        to a site dir and the other installed just to a path on PYTHONPATH
        should leave the namespace in tact and both packages reachable by
        import.
        """
        pkg_A = namespaces.build_namespace_package(tmpdir, 'myns.pkgA')
        pkg_B = namespaces.build_namespace_package(tmpdir, 'myns.pkgB')
        site_packages = tmpdir / 'site-packages'
        path_packages = tmpdir / 'path-packages'
        targets = site_packages, path_packages
        # use pip to install to the target directory
        install_cmd = [
            sys.executable,
            '-m',
            'pip.__main__',
            'install',
            str(pkg_A),
            '-t',
            str(site_packages),
        ]
>       subprocess.check_call(install_cmd)

setuptools/tests/test_namespaces.py:32: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

popenargs = (['/usr/bin/python3', '-m', 'pip.__main__', 'install', '/tmp/pytest-of-mockbuild/pytest-0/test_mixed_site_and_non_site0/myns.pkgA', '-t', ...],)
kwargs = {}, retcode = 1
cmd = ['/usr/bin/python3', '-m', 'pip.__main__', 'install', '/tmp/pytest-of-mockbuild/pytest-0/test_mixed_site_and_non_site0/myns.pkgA', '-t', ...]

    def check_call(*popenargs, **kwargs):
        """Run command with arguments.  Wait for command to complete.  If
        the exit code was zero then return, otherwise raise
        CalledProcessError.  The CalledProcessError object will have the
        return code in the returncode attribute.
    
        The arguments are the same as for the call function.  Example:
    
        check_call(["ls", "-l"])
        """
        retcode = call(*popenargs, **kwargs)
        if retcode:
            cmd = kwargs.get("args")
            if cmd is None:
                cmd = popenargs[0]
>           raise CalledProcessError(retcode, cmd)
E           subprocess.CalledProcessError: Command '['/usr/bin/python3', '-m', 'pip.__main__', 'install', '/tmp/pytest-of-mockbuild/pytest-0/test_mixed_site_and_non_site0/myns.pkgA', '-t', '/tmp/pytest-of-mockbuild/pytest-0/test_mixed_site_and_non_site0/site-packages']' returned non-zero exit status 1.

/usr/lib64/python3.14/subprocess.py:419: CalledProcessError
----------------------------- Captured stdout call -----------------------------
Processing /tmp/pytest-of-mockbuild/pytest-0/test_mixed_site_and_non_site0/myns.pkgA
  Installing build dependencies: started
  Installing build dependencies: finished with status 'error'
----------------------------- Captured stderr call -----------------------------
  error: subprocess-exited-with-error
  
  × installing build dependencies did not run successfully.
  │ exit code: 1
  ╰─> [7 lines of output]
      WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f61f29b2510>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/setuptools/
      WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f61f297b390>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/setuptools/
      WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f61f297b4d0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/setuptools/
      WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f61f297b610>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/setuptools/
      WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f61f297b750>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/setuptools/
      ERROR: Could not find a version that satisfies the requirement setuptools>=40.8.0 (from versions: none)
      ERROR: No matching distribution found for setuptools>=40.8.0
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
ERROR: Failed to build 'file:///tmp/pytest-of-mockbuild/pytest-0/test_mixed_site_and_non_site0/myns.pkgA' when installing build dependencies
___________________ TestNamespaces.test_pkg_resources_import ___________________

self = <setuptools.tests.test_namespaces.TestNamespaces object at 0x7fb71ee5a210>
tmpdir = local('/tmp/pytest-of-mockbuild/pytest-0/test_pkg_resources_import0')

    def test_pkg_resources_import(self, tmpdir):
        """
        Ensure that a namespace package doesn't break on import
        of pkg_resources.
        """
        pkg = namespaces.build_namespace_package(tmpdir, 'myns.pkgA')
        target = tmpdir / 'packages'
        target.mkdir()
        install_cmd = [
            sys.executable,
            '-m',
            'pip',
            'install',
            '-t',
            str(target),
            str(pkg),
        ]
        with paths_on_pythonpath([str(target)]):
>           subprocess.check_call(install_cmd)

setuptools/tests/test_namespaces.py:70: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

popenargs = (['/usr/bin/python3', '-m', 'pip', 'install', '-t', '/tmp/pytest-of-mockbuild/pytest-0/test_pkg_resources_import0/packages', ...],)
kwargs = {}, retcode = 1
cmd = ['/usr/bin/python3', '-m', 'pip', 'install', '-t', '/tmp/pytest-of-mockbuild/pytest-0/test_pkg_resources_import0/packages', ...]

    def check_call(*popenargs, **kwargs):
        """Run command with arguments.  Wait for command to complete.  If
        the exit code was zero then return, otherwise raise
        CalledProcessError.  The CalledProcessError object will have the
        return code in the returncode attribute.
    
        The arguments are the same as for the call function.  Example:
    
        check_call(["ls", "-l"])
        """
        retcode = call(*popenargs, **kwargs)
        if retcode:
            cmd = kwargs.get("args")
            if cmd is None:
                cmd = popenargs[0]
>           raise CalledProcessError(retcode, cmd)
E           subprocess.CalledProcessError: Command '['/usr/bin/python3', '-m', 'pip', 'install', '-t', '/tmp/pytest-of-mockbuild/pytest-0/test_pkg_resources_import0/packages', '/tmp/pytest-of-mockbuild/pytest-0/test_pkg_resources_import0/myns.pkgA']' returned non-zero exit status 1.

/usr/lib64/python3.14/subprocess.py:419: CalledProcessError
----------------------------- Captured stdout call -----------------------------
Processing /tmp/pytest-of-mockbuild/pytest-0/test_pkg_resources_import0/myns.pkgA
  Installing build dependencies: started
  Installing build dependencies: finished with status 'error'
----------------------------- Captured stderr call -----------------------------
  error: subprocess-exited-with-error
  
  × installing build dependencies did not run successfully.
  │ exit code: 1
  ╰─> [7 lines of output]
      WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f1bd6d0e7b0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/setuptools/
      WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f1bd6cd7610>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/setuptools/
      WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f1bd6cd7750>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/setuptools/
      WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f1bd6cd7890>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/setuptools/
      WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f1bd6cd79d0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/setuptools/
      ERROR: Could not find a version that satisfies the requirement setuptools>=40.8.0 (from versions: none)
      ERROR: No matching distribution found for setuptools>=40.8.0
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
ERROR: Failed to build 'file:///tmp/pytest-of-mockbuild/pytest-0/test_pkg_resources_import0/myns.pkgA' when installing build dependencies
___________ TestNamespaces.test_namespace_package_installed_and_cwd ____________

self = <setuptools.tests.test_namespaces.TestNamespaces object at 0x7fb71ee1bbb0>
tmpdir = local('/tmp/pytest-of-mockbuild/pytest-0/test_namespace_package_install0')

    def test_namespace_package_installed_and_cwd(self, tmpdir):
        """
        Installing a namespace packages but also having it in the current
        working directory, only one version should take precedence.
        """
        pkg_A = namespaces.build_namespace_package(tmpdir, 'myns.pkgA')
        target = tmpdir / 'packages'
        # use pip to install to the target directory
        install_cmd = [
            sys.executable,
            '-m',
            'pip.__main__',
            'install',
            str(pkg_A),
            '-t',
            str(target),
        ]
>       subprocess.check_call(install_cmd)

setuptools/tests/test_namespaces.py:97: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

popenargs = (['/usr/bin/python3', '-m', 'pip.__main__', 'install', '/tmp/pytest-of-mockbuild/pytest-0/test_namespace_package_install0/myns.pkgA', '-t', ...],)
kwargs = {}, retcode = 1
cmd = ['/usr/bin/python3', '-m', 'pip.__main__', 'install', '/tmp/pytest-of-mockbuild/pytest-0/test_namespace_package_install0/myns.pkgA', '-t', ...]

    def check_call(*popenargs, **kwargs):
        """Run command with arguments.  Wait for command to complete.  If
        the exit code was zero then return, otherwise raise
        CalledProcessError.  The CalledProcessError object will have the
        return code in the returncode attribute.
    
        The arguments are the same as for the call function.  Example:
    
        check_call(["ls", "-l"])
        """
        retcode = call(*popenargs, **kwargs)
        if retcode:
            cmd = kwargs.get("args")
            if cmd is None:
                cmd = popenargs[0]
>           raise CalledProcessError(retcode, cmd)
E           subprocess.CalledProcessError: Command '['/usr/bin/python3', '-m', 'pip.__main__', 'install', '/tmp/pytest-of-mockbuild/pytest-0/test_namespace_package_install0/myns.pkgA', '-t', '/tmp/pytest-of-mockbuild/pytest-0/test_namespace_package_install0/packages']' returned non-zero exit status 1.

/usr/lib64/python3.14/subprocess.py:419: CalledProcessError
----------------------------- Captured stdout call -----------------------------
Processing /tmp/pytest-of-mockbuild/pytest-0/test_namespace_package_install0/myns.pkgA
  Installing build dependencies: started
  Installing build dependencies: finished with status 'error'
----------------------------- Captured stderr call -----------------------------
  error: subprocess-exited-with-error
  
  × installing build dependencies did not run successfully.
  │ exit code: 1
  ╰─> [7 lines of output]
      WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7fc0a878e510>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/setuptools/
      WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7fc0a8757390>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/setuptools/
      WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7fc0a87574d0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/setuptools/
      WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7fc0a8757610>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/setuptools/
      WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7fc0a8757750>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/setuptools/
      ERROR: Could not find a version that satisfies the requirement setuptools>=40.8.0 (from versions: none)
      ERROR: No matching distribution found for setuptools>=40.8.0
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
ERROR: Failed to build 'file:///tmp/pytest-of-mockbuild/pytest-0/test_namespace_package_install0/myns.pkgA' when installing build dependencies
_____ TestNamespaces.test_packages_in_the_same_namespace_installed_and_cwd _____

self = <setuptools.tests.test_namespaces.TestNamespaces object at 0x7fb71ee1b5c0>
tmpdir = local('/tmp/pytest-of-mockbuild/pytest-0/test_packages_in_the_same_name0')

    def test_packages_in_the_same_namespace_installed_and_cwd(self, tmpdir):
        """
        Installing one namespace package and also have another in the same
        namespace in the current working directory, both of them must be
        importable.
        """
        pkg_A = namespaces.build_namespace_package(tmpdir, 'myns.pkgA')
        pkg_B = namespaces.build_namespace_package(tmpdir, 'myns.pkgB')
        target = tmpdir / 'packages'
        # use pip to install to the target directory
        install_cmd = [
            sys.executable,
            '-m',
            'pip.__main__',
            'install',
            str(pkg_A),
            '-t',
            str(target),
        ]
>       subprocess.check_call(install_cmd)

setuptools/tests/test_namespaces.py:128: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

popenargs = (['/usr/bin/python3', '-m', 'pip.__main__', 'install', '/tmp/pytest-of-mockbuild/pytest-0/test_packages_in_the_same_name0/myns.pkgA', '-t', ...],)
kwargs = {}, retcode = 1
cmd = ['/usr/bin/python3', '-m', 'pip.__main__', 'install', '/tmp/pytest-of-mockbuild/pytest-0/test_packages_in_the_same_name0/myns.pkgA', '-t', ...]

    def check_call(*popenargs, **kwargs):
        """Run command with arguments.  Wait for command to complete.  If
        the exit code was zero then return, otherwise raise
        CalledProcessError.  The CalledProcessError object will have the
        return code in the returncode attribute.
    
        The arguments are the same as for the call function.  Example:
    
        check_call(["ls", "-l"])
        """
        retcode = call(*popenargs, **kwargs)
        if retcode:
            cmd = kwargs.get("args")
            if cmd is None:
                cmd = popenargs[0]
>           raise CalledProcessError(retcode, cmd)
E           subprocess.CalledProcessError: Command '['/usr/bin/python3', '-m', 'pip.__main__', 'install', '/tmp/pytest-of-mockbuild/pytest-0/test_packages_in_the_same_name0/myns.pkgA', '-t', '/tmp/pytest-of-mockbuild/pytest-0/test_packages_in_the_same_name0/packages']' returned non-zero exit status 1.

/usr/lib64/python3.14/subprocess.py:419: CalledProcessError
----------------------------- Captured stdout call -----------------------------
Processing /tmp/pytest-of-mockbuild/pytest-0/test_packages_in_the_same_name0/myns.pkgA
  Installing build dependencies: started
  Installing build dependencies: finished with status 'error'
----------------------------- Captured stderr call -----------------------------
  error: subprocess-exited-with-error
  
  × installing build dependencies did not run successfully.
  │ exit code: 1
  ╰─> [7 lines of output]
      WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f519c8e6510>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/setuptools/
      WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f519c8b7390>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/setuptools/
      WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f519c8b74d0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/setuptools/
      WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f519c8b7610>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/setuptools/
      WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f519c8b7750>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/setuptools/
      ERROR: Could not find a version that satisfies the requirement setuptools>=40.8.0 (from versions: none)
      ERROR: No matching distribution found for setuptools>=40.8.0
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
ERROR: Failed to build 'file:///tmp/pytest-of-mockbuild/pytest-0/test_packages_in_the_same_name0/myns.pkgA' when installing build dependencies
=========================== short test summary info ============================
FAILED setuptools/tests/test_dist.py::test_dist_fetch_build_egg - distutils.e...
FAILED setuptools/tests/test_namespaces.py::TestNamespaces::test_mixed_site_and_non_site
FAILED setuptools/tests/test_namespaces.py::TestNamespaces::test_pkg_resources_import
FAILED setuptools/tests/test_namespaces.py::TestNamespaces::test_namespace_package_installed_and_cwd
FAILED setuptools/tests/test_namespaces.py::TestNamespaces::test_packages_in_the_same_namespace_installed_and_cwd
= 5 failed, 1017 passed, 21 skipped, 27 deselected, 9 xfailed, 2 xpassed in 119.34s (0:01:59) =


This looks like the following change in pip:

https://pip.pypa.io/en/stable/news/#v25-3

"""
Remove support for the deprecated setup.py bdist_wheel mechanism. Consequently, --use-pep517 is now always on, and --no-use-pep517 has been removed.
"""

https://github.com/pypa/pip/issues/6334


As a workaround, try building the package with PIP_NO_BUILD_ISOLATION=0 set -- that disables build isolation (which is a tad confusing, see https://github.com/pypa/pip/issues/5735).

However, in seuptools, this might indicate a more serious problem :/


Version-Release number of selected component (if applicable): 80.9.0-1.fc44

Steps to Reproduce: Build the package from distgit using our copr linked above. E.g.:

fedpkg --release rawhide mockbuild -- --addrepo=https://download.copr.fedorainfracloud.org/results/churchyard/pip-25.3/fedora-rawhide-x86_64