#20103 Flaky test: `src/python/pants/backend/python/util_rules/pex_test.py::test_interpreter_constraints` fails with `No supported version of Pip is compatible with the given targets` sometimes Issue created by huonw Describe the bug The

src/python/pants/backend/python/util_rules/pex_test.py::test_interpreter_constraints

test sometimes fails with `No supported version of Pip is compatible with the given targets`:

_________________________ test_interpreter_constraints _________________________

rule_runner = RuleRunner(build_root=/tmp/_BUILD_ROOTlz0ula6c)

    def test_interpreter_constraints(rule_runner: RuleRunner) -> None:
        constraints = InterpreterConstraints(["CPython>=2.7,<3", "CPython>=3.6"])
>       pex_info = create_pex_and_get_pex_info(
            rule_runner, interpreter_constraints=constraints, internal_only=False
        )

src/python/pants/backend/python/util_rules/pex_test.py:422: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
src/python/pants/backend/python/util_rules/pex_test_utils.py:159: in create_pex_and_get_pex_info
    return create_pex_and_get_all_data(
src/python/pants/backend/python/util_rules/pex_test_utils.py:140: in create_pex_and_get_all_data
    pex = rule_runner.request(Pex, [request])
src/python/pants/testutil/rule_runner.py:401: in request
    result = assert_single_element(self.scheduler.product_request(output_type, [params]))
src/python/pants/engine/internals/scheduler.py:582: in product_request
    return self.execute(request)
src/python/pants/engine/internals/scheduler.py:523: in execute
    self._raise_on_error([t for _, t in throws])
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <pants.engine.internals.scheduler.SchedulerSession object at 0x7f91dc27d8b0>
throws = [Throw(exc=ProcessExecutionFailure("Process 'Building test.pex' failed with exit code 1.\nstdout:\n\nstderr:\nNo suppo...oot for inspection.\n', engine_traceback=[('pants.backend.python.util_rules.pex.create_pex', None), ('select', None)])]

    def _raise_on_error(self, throws: list[Throw]) -> NoReturn:
        exception_noun = pluralize(len(throws), "Exception")
        others_msg = f"\n(and {len(throws) - 1} more)\n" if len(throws) > 1 else ""
>       raise ExecutionError(
            f"{exception_noun} encountered:\n\n"
            f"{throws[0].render(self._scheduler.include_trace_on_error)}\n"
            f"{others_msg}",
            wrapped_exceptions=tuple(t.exc for t in throws),
        )
E       pants.engine.internals.scheduler.ExecutionError: 1 Exception encountered:
E       
E       Engine traceback:
E         in select
E           ..
E         in pants.backend.python.util_rules.pex.create_pex
E           ..
E       
E       Traceback (most recent call last):
E         File "src/python/pants/backend/python/util_rules/pex.py", line 815, in create_pex
E           result = await Get(BuildPexResult, PexRequest, request)
E         File "src/python/pants/engine/internals/selectors.py", line 122, in __await__
E           result = yield self
E       pants.engine.process.ProcessExecutionFailure: Process 'Building test.pex' failed with exit code 1.
E       stdout:
E       
E       stderr:
E       No supported version of Pip is compatible with the given targets:
E       cp27-cp27mu-manylinux_2_31_x86_64 interpreter at /usr/bin/python2.7
E       cp310-cp310-manylinux_2_31_x86_64 interpreter at /opt/hostedtoolcache/Python/3.10.13/x64/bin/python3.10
E       cp311-cp311-manylinux_2_31_x86_64 interpreter at /opt/hostedtoolcache/Python/3.11.6/x64/bin/python3.11
E       cp312-cp312-manylinux_2_31_x86_64 interpreter at /opt/hostedtoolcache/Python/3.12.0/x64/bin/python3.12
E       cp37-cp37m-manylinux_2_31_x86_64 interpreter at /opt/hostedtoolcache/Python/3.7.17/x64/bin/python3.7
E       cp38-cp38-manylinux_2_31_x86_64 interpreter at /opt/hostedtoolcache/Python/3.8.18/x64/bin/python3.8
E       cp38-cp38-manylinux_2_31_x86_64 interpreter at /usr/bin/python3.8
E       cp39-cp39-manylinux_2_31_x86_64 interpreter at /home/runner/.cache/pants/named_caches/pex_root/venvs/4bfbfcbc6a986fea6cde0d5d7c4efc6d60ea46f5/ec5c5a4408c4e23ea619544b8d413402fd66780f/bin/python3.9
E       cp39-cp39-manylinux_2_31_x86_64 interpreter at /opt/hostedtoolcache/Python/3.9.18/x64/bin/python3.9
E       
E       
E       
E       Use `--keep-sandboxes=on_failure` to preserve the process chroot for inspection.

src/python/pants/engine/internals/scheduler.py:507: ExecutionError
- generated xml file: src.python.pants.backend.python.util_rules.pex_test.py.tests.xml -
=========================== short test summary info ============================
FAILED src/python/pants/backend/python/util_rules/pex_test.py::test_interpreter_constraints

Examples: • https://github.com/pantsbuild/pants/actions/runs/6660364237/job/18102045568 (#20102) • https://github.com/pantsbuild/pants/actions/runs/6659967051/job/18102086696 (#20101) • https://github.com/pantsbuild/pants/actions/runs/6658225473/job/18094724006 (189d20a on

main

) Pants version Various near-current

main

commits. OS Linux Additional info #19879 (comment) may have relevant/related background, suggesting that this could be caused by tests interacting to have an appropriate pip version preinstalled into a shared cache. The exact symptom was different there, although the pip has since been upgraded to 2.1.148 (#20048). pantsbuild/pants