# Buggy code
def spawn_download_distributions(
    self,
    download_dir,
    requirements=None,
    requirement_files=None,
    constraint_files=None,
    allow_prereleases=False,
    transitive=True,
    target=None,
    indexes=None,
    find_links=None,
    network_configuration=None,
    cache=None,
    build=True,
    manylinux=None,
    use_wheel=True,
):
    target = target or DistributionTarget.current()

    platform = target.get_platform()
    if not use_wheel:
        if not build:
            raise ValueError(
                "Cannot both ignore wheels (use_wheel=False) and refrain from building "
                "distributions (build=False)."
            )
        elif target.is_foreign:
            raise ValueError(
                "Cannot ignore wheels (use_wheel=False) when resolving for a foreign "
                "platform: {}".format(platform)
            )

    download_cmd = ["download", "--dest", download_dir]
    download_cmd.extend(
        self._calculate_package_index_args(
            indexes=indexes,
            find_links=find_links,
            network_configuration=network_configuration,
        )
    )
    env = dict(
        self._calculate_network_configuration_env(
            network_configuration=network_configuration
        )
    )

    if target.is_foreign:
        # We're either resolving for a different host / platform or a different interpreter for the
        # current platform that we have no access to; so we need to let pip know and not otherwise
        # pickup platform info from the interpreter we execute pip with.
        if manylinux and platform.platform.startswith("linux"):
            download_cmd.extend(
                ["--platform", platform.platform.replace("linux", manylinux, 1)]
            )
        download_cmd.extend(["--platform", platform.platform])
        download_cmd.extend(["--implementation", platform.impl])
        download_cmd.extend(["--python-version", platform.version])
        download_cmd.extend(["--abi", platform.abi])

    if target.is_foreign or not build:
        download_cmd.extend(["--only-binary", ":all:"])

    if not use_wheel:
        download_cmd.extend(["--no-binary", ":all:"])

    if allow_prereleases:
        download_cmd.append("--pre")

    if not transitive:
        download_cmd.append("--no-deps")

    if requirement_files:
        for requirement_file in requirement_files:
            download_cmd.extend(["--requirement", requirement_file])

    if constraint_files:
        for constraint_file in constraint_files:
            download_cmd.extend(["--constraint", constraint_file])

    download_cmd.extend(requirements)

    return self._spawn_pip_isolated(
        download_cmd, env=env, cache=cache, interpreter=target.get_interpreter()
    )


# Traceback (pip._internal.exceptions.InstallationError)
$ docker run --rm -it -e HTTP_PROXY -e HTTPS_PROXY -v $REQUESTS_CA_BUNDLE:/ca-cert.crt -v $(pwd):/app python:3.7 bash
$ pip install --cert /ca-cert.crt pex
$ pex -vvvvvvvvv --cert /ca-cert.crt black setuptools
...
pex: Building pex :: Resolving distributions (['black', 'setuptools']) :: Resolving for:
pex: Spawning a maximum of 12 parallel jobs to process:r/local/bin/python3.7', PythonIdentity('/usr/local/bin/python', 'cp37', 'cp37m', 'manylinux2014_x86_64', (3, 7, 9))))
DistributionTarget(interpreter=PythonInterpreter('/usr/local/bin/python3.7', PythonIdentity('/usr/local/bin/python', 'cp37', 'cp37m', 'manylinux2014_x86_64', (3, 7, 9))))
pex: Hashing pex: 39.5ms
pex: Isolating pex: 97.5ms
pex:   Extracting pex to /root/.pex/isolated/a8ebd39cfba0316d0416132e488ffc14d28893b5: 97.0ms
pex: Vendoring packaging from VendorSpec(key='packaging', requirement='packaging==19.2', rewrite=True, constrain=True) @ /usr/local/lib/python3.7/site-packages/pex/vendor/_vendored/packaging
pex: Vendoring pyparsing from VendorSpec(key='packaging', requirement='packaging==19.2', rewrite=True, constrain=True) @ /usr/local/lib/python3.7/site-packages/pex/vendor/_vendored/packaging
pex: Vendoring pkg_resources from VendorSpec(key='setuptools', requirement='setuptools==42.0.2', rewrite=True, constrain=True) @ /usr/local/lib/python3.7/site-packages/pex/vendor/_vendored/setuptools
pex: Executing: /usr/local/bin/python3.7 -s -E /tmp/tmplte70n5r
pex: PEX.run invoking /usr/local/bin/python3.7 /root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5 --disable-pip-version-check --isolated --no-python-version-warning --exists-action a -vvv --cache-dir /root/.pex download --dest /tmp/tmpt3ltlh3v/usr.local.bin.python3.7 --header Cache-Control:max-age=3600 --retries 5 --timeout 15 --cert /ca-cert.crt black setuptools
pex: Installed VendorImporter(root='/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.bootstrap', importables=(_Importable(module='pyparsing', is_pkg=False, path='pex/vendor/_vendored/packaging', prefix='pex.third_party'), _Importable(module='packaging', is_pkg=True, path='pex/vendor/_vendored/packaging', prefix='pex.third_party'), _Importable(module='pkg_resources', is_pkg=True, path='pex/vendor/_vendored/setuptools', prefix='pex.third_party')))
pex: Installed VendorImporter(root='/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.bootstrap', importables=(_Importable(module='compiler', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='distribution_target', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='resolver', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='variables', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='executor', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='version', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='pex_info', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='tracer', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='environment', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='testing', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='compatibility', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='bootstrap', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='network_configuration', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='__main__', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='util', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='pex', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='pex_bootstrapper', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='requirements', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='pex_builder', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='jobs', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='typing', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='pip', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='interpreter_constraints', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='interpreter', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='finders', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='platforms', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='orderedset', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='common', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='pex_warnings', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='dist_metadata', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='vendor', is_pkg=True, path='pex', prefix='_pex'), _Importable(module='third_party', is_pkg=True, path='pex', prefix='_pex')))
pex: pex.third_party.packaging imported via _Loader(module_name='pex.third_party.packaging', vendor_module_name='pex.vendor._vendored.packaging.packaging')
pex: pex.third_party.pyparsing imported via _Loader(module_name='pex.third_party.pyparsing', vendor_module_name='pex.vendor._vendored.packaging.pyparsing')
pex: pex.third_party.pkg_resources imported via _Loader(module_name='pex.third_party.pkg_resources', vendor_module_name='pex.vendor._vendored.setuptools.pkg_resources')
pex: pex.third_party.pkg_resources.extern imported via _Loader(module_name='pex.third_party.pkg_resources.extern', vendor_module_name='pex.vendor._vendored.setuptools.pkg_resources.extern')
pex: pex.third_party.pkg_resources.extern.six imported via _Loader(module_name='pex.third_party.pkg_resources.extern.six', vendor_module_name='pex.vendor._vendored.setuptools.pkg_resources.extern.six')
pex: pex.third_party.pkg_resources.extern.six.moves imported via _Loader(module_name='pex.third_party.pkg_resources.extern.six.moves', vendor_module_name='pex.vendor._vendored.setuptools.pkg_resources.extern.six.moves')
pex: pex.third_party.pkg_resources.extern.packaging imported via _Loader(module_name='pex.third_party.pkg_resources.extern.packaging', vendor_module_name='pex.vendor._vendored.setuptools.pkg_resources.extern.packaging')
pex: pex.third_party.pkg_resources.extern.packaging.version imported via _Loader(module_name='pex.third_party.pkg_resources.extern.packaging.version', vendor_module_name='pex.vendor._vendored.setuptools.pkg_resources.extern.packaging.version')
pex: pex.third_party.pkg_resources.extern.packaging.specifiers imported via _Loader(module_name='pex.third_party.pkg_resources.extern.packaging.specifiers', vendor_module_name='pex.vendor._vendored.setuptools.pkg_resources.extern.packaging.specifiers')
pex: pex.third_party.pkg_resources.extern.pyparsing imported via _Loader(module_name='pex.third_party.pkg_resources.extern.pyparsing', vendor_module_name='pex.vendor._vendored.setuptools.pkg_resources.extern.pyparsing')
pex: pex.third_party.pkg_resources.extern.six.moves.urllib imported via _Loader(module_name='pex.third_party.pkg_resources.extern.six.moves.urllib', vendor_module_name='pex.vendor._vendored.setuptools.pkg_resources.extern.six.moves.urllib')
pex: pex.third_party.pkg_resources.extern.packaging.requirements imported via _Loader(module_name='pex.third_party.pkg_resources.extern.packaging.requirements', vendor_module_name='pex.vendor._vendored.setuptools.pkg_resources.extern.packaging.requirements')
pex: pex.third_party.pkg_resources.extern.packaging.markers imported via _Loader(module_name='pex.third_party.pkg_resources.extern.packaging.markers', vendor_module_name='pex.vendor._vendored.setuptools.pkg_resources.extern.packaging.markers')
pex: pex.third_party.pkg_resources imported via _Loader(module_name='pex.third_party.pkg_resources', vendor_module_name='pex.vendor._vendored.setuptools.pkg_resources')
pex: pex.third_party.packaging.specifiers imported via _Loader(module_name='pex.third_party.packaging.specifiers', vendor_module_name='pex.vendor._vendored.packaging.packaging.specifiers')
pex: Using the current interpreter /usr/local/bin/python3.7 since no constraints have been specified and PYTHONPATH is not set.
pex: Selecting runtime interpreter: 0.1ms
pex: Found site-library: /usr/local/lib/python3.7/site-packages
pex: Found .pth file: /usr/local/lib/python3.7/site-packages/distutils-precedence.pth
pex: Not a tainted path element: /root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.bootstrap
pex: Not a tainted path element: /root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5
pex: Not a tainted path element: /usr/local/lib/python37.zip
pex: Not a tainted path element: /usr/local/lib/python3.7
pex: Not a tainted path element: /usr/local/lib/python3.7/lib-dynload
pex: Tainted path element: /usr/local/lib/python3.7/site-packages
pex: Scrubbing from user site: /root/.local/lib/python3.7/site-packages
pex: Scrubbing from site-packages: /usr/local/lib/python3.7/site-packages
pex: Dropping _distutils_hack
pex: Dropping setuptools
pex: Dropping _distutils_hack.override
pex: Dropping setuptools._distutils
pex: Dropping distutils
pex: Dropping distutils.core
pex: Dropping distutils.debug
pex: Dropping distutils.errors
pex: Dropping distutils.dist
pex: Dropping distutils.fancy_getopt
pex: Dropping distutils.util
pex: Dropping distutils.dep_util
pex: Dropping distutils.spawn
pex: Dropping distutils.log
pex: Dropping distutils.py35compat
pex: Dropping distutils.cmd
pex: Dropping distutils.dir_util
pex: Dropping distutils.file_util
pex: Dropping distutils.archive_util
pex: Dropping distutils.config
pex: Dropping distutils.extension
pex: Dropping setuptools._deprecation_warning
pex: Dropping setuptools.version
pex: Dropping pkg_resources
pex: Dropping pkg_resources.extern
pex: Dropping pkg_resources._vendor
pex: Dropping pkg_resources._vendor.appdirs
pex: Dropping pkg_resources.extern.appdirs
pex: Dropping pkg_resources._vendor.packaging
pex: Dropping pkg_resources._vendor.packaging.__about__
pex: Dropping pkg_resources.extern.packaging
pex: Dropping pkg_resources.extern.packaging.version
pex: Dropping pkg_resources.extern.packaging._structures
pex: Dropping pkg_resources.extern.packaging._typing
pex: Dropping pkg_resources.extern.packaging.specifiers
pex: Dropping pkg_resources.extern.packaging._compat
pex: Dropping pkg_resources.extern.packaging.utils
pex: Dropping pkg_resources.extern.packaging.requirements
pex: Dropping pkg_resources._vendor.pyparsing
pex: Dropping pkg_resources.extern.pyparsing
pex: Dropping pkg_resources.extern.packaging.markers
pex: Dropping setuptools.extension
pex: Dropping setuptools.monkey
pex: Dropping distutils.filelist
pex: Dropping setuptools.dist
pex: Dropping distutils.version
pex: Dropping setuptools.extern
pex: Dropping setuptools._vendor
pex: Dropping setuptools._vendor.packaging
pex: Dropping setuptools._vendor.packaging.__about__
pex: Dropping setuptools.extern.packaging
pex: Dropping setuptools._vendor.ordered_set
pex: Dropping setuptools.extern.ordered_set
pex: Dropping setuptools.windows_support
pex: Dropping setuptools.config
pex: Dropping setuptools.extern.packaging.version
pex: Dropping setuptools.extern.packaging._structures
pex: Dropping setuptools.extern.packaging._typing
pex: Dropping setuptools.extern.packaging.specifiers
pex: Dropping setuptools.extern.packaging._compat
pex: Dropping setuptools.extern.packaging.utils
pex: Dropping setuptools.depends
pex: Dropping setuptools._imp
pex: Dropping setuptools.py34compat
pex: Dropping setuptools.msvc
pex: Dropping distutils.ccompiler
pex: Dropping distutils.sysconfig
pex: Dropping distutils.text_file
pex: New sys.path: ['/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.bootstrap', '/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5', '/usr/local/lib/python37.zip', '/usr/local/lib/python3.7', '/usr/local/lib/python3.7/lib-dynload']
pex: E: tags for 'manylinux2014_x86_64' x PythonInterpreter('/usr/local/bin/python3.7', PythonIdentity('/usr/local/bin/python3.7', 'cp37', 'cp37m', 'manylinux2014_x86_64', (3, 7, 9))) -> frozenset({<cp37-cp37m-manylinux1_x86_64 @ 140329298470704>, <py30-none-manylinux2014_x86_64 @ 140329298487648>, <cp37-none-manylinux2010_x86_64 @ 140329298471584>, <py30-none-any @ 140329298488928>, <cp35-abi3-manylinux2014_x86_64 @ 140329298472544>, <py34-none-linux_x86_64 @ 140329298485888>, <cp36-abi3-linux_x86_64 @ 140329298472464>, <py35-none-any @ 140329298488528>, <py35-none-linux_x86_64 @ 140329298485328>, <py33-none-linux_x86_64 @ 140329298486448>, <py37-none-manylinux1_x86_64 @ 140329298483392>, <py35-none-manylinux2014_x86_64 @ 140329298484752>, <cp36-abi3-manylinux2014_x86_64 @ 140329298471984>, <cp37-none-any @ 140329298488208>, <py32-none-manylinux1_x86_64 @ 140329298486848>, <cp37-none-manylinux2014_x86_64 @ 140329298471424>, <py36-none-manylinux1_x86_64 @ 140329298484512>, <py30-none-linux_x86_64 @ 140329298488128>, <py34-none-manylinux1_x86_64 @ 140329298485728>, <cp37-abi3-manylinux1_x86_64 @ 140329298471184>, <cp36-abi3-manylinux1_x86_64 @ 140329298472304>, <cp35-abi3-manylinux1_x86_64 @ 140329298472864>, <cp37-none-linux_x86_64 @ 140329298471904>, <py32-none-any @ 140329298488768>, <py37-none-manylinux2014_x86_64 @ 140329298483072>, <cp37-cp37m-linux_x86_64 @ 140329298470384>, <cp34-abi3-linux_x86_64 @ 140329298481872>, <py32-none-manylinux2014_x86_64 @ 140329298486528>, <py37-none-any @ 140329298488288>, <cp37-abi3-manylinux2014_x86_64 @ 140329298470864>, <py31-none-linux_x86_64 @ 140329298487568>, <py31-none-any @ 140329298488848>, <py34-none-any @ 140329298488608>, <py31-none-manylinux2014_x86_64 @ 140329298487088>, <py34-none-manylinux2014_x86_64 @ 140329298485408>, <cp37-cp37m-manylinux2010_x86_64 @ 140329298470544>, <py36-none-linux_x86_64 @ 140329298484672>, <cp37-cp37m-manylinux2014_x86_64 @ 140329298389504>, <py30-none-manylinux1_x86_64 @ 140329298487968>, <py31-none-manylinux2010_x86_64 @ 140329298487248>, <py3-none-manylinux2010_x86_64 @ 140329298483792>, <py35-none-manylinux1_x86_64 @ 140329298485072>, <py33-none-manylinux2010_x86_64 @ 140329298486128>, <py36-none-any @ 140329298488448>, <cp33-abi3-manylinux1_x86_64 @ 140329298482272>, <py33-none-any @ 140329298488688>, <cp32-abi3-manylinux2010_x86_64 @ 140329298482672>, <cp37-none-manylinux1_x86_64 @ 140329298471744>, <py36-none-manylinux2014_x86_64 @ 140329298484192>, <py33-none-manylinux2014_x86_64 @ 140329298485968>, <cp34-abi3-manylinux1_x86_64 @ 140329298481712>, <py36-none-manylinux2010_x86_64 @ 140329298484352>, <cp37-abi3-linux_x86_64 @ 140329298471344>, <cp32-abi3-linux_x86_64 @ 140329298482992>, <cp35-abi3-linux_x86_64 @ 140329298481312>, <cp32-abi3-manylinux2014_x86_64 @ 140329298482512>, <cp36-abi3-manylinux2010_x86_64 @ 140329298472144>, <cp35-abi3-manylinux2010_x86_64 @ 140329298472704>, <py37-none-manylinux2010_x86_64 @ 140329298483232>, <py3-none-manylinux1_x86_64 @ 140329298483952>, <cp33-abi3-linux_x86_64 @ 140329298482432>, <cp34-abi3-manylinux2010_x86_64 @ 140329298481552>, <py32-none-manylinux2010_x86_64 @ 140329298486688>, <cp33-abi3-manylinux2014_x86_64 @ 140329298481952>, <py3-none-any @ 140329298488368>, <py34-none-manylinux2010_x86_64 @ 140329298485568>, <py3-none-manylinux2014_x86_64 @ 140329298483632>, <py32-none-linux_x86_64 @ 140329298487008>, <cp37-abi3-manylinux2010_x86_64 @ 140329298471024>, <cp33-abi3-manylinux2010_x86_64 @ 140329298482112>, <py37-none-linux_x86_64 @ 140329298483552>, <py33-none-manylinux1_x86_64 @ 140329298486288>, <cp34-abi3-manylinux2014_x86_64 @ 140329298481392>, <cp32-abi3-manylinux1_x86_64 @ 140329298482832>, <py30-none-manylinux2010_x86_64 @ 140329298487808>, <py3-none-linux_x86_64 @ 140329298484112>, <py35-none-manylinux2010_x86_64 @ 140329298484912>, <py31-none-manylinux1_x86_64 @ 140329298487408>})
pex: Activating PEX virtual environment from /root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5: 10.8ms
pex:   Searching dependency cache: /root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.deps: 1.4ms
pex:     Adding setuptools 42.0.2: 0.1ms
pex:     Adding wheel 0.33.6: 0.1ms
pex:     Adding pip 20.0.dev0: 0.1ms
pex:   Resolving pip from [Requirement.parse('pip==20.0.dev0')]: 2.0ms
pex:   Resolving setuptools from [Requirement.parse('setuptools==42.0.2')]: 2.7ms
pex:   Resolving wheel from [Requirement.parse('wheel==0.33.6')]: 1.9ms
pex:   Activating pip 20.0.dev0: 0.2ms
pex:     Adding sitedir: 0.1ms
pex:   Activating setuptools 42.0.2: 0.3ms
pex:     Adding sitedir: 0.2ms
pex:   Activating wheel 0.33.6: 0.3ms
pex:     Adding sitedir: 0.2ms
pex: Bootstrap complete, performing final sys.path modifications...
pex: Not uninstalling VendorImporter(root='/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.bootstrap', importables=(_Importable(module='compiler', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='distribution_target', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='resolver', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='variables', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='executor', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='version', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='pex_info', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='tracer', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='environment', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='testing', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='compatibility', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='bootstrap', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='network_configuration', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='__main__', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='util', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='pex', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='pex_bootstrapper', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='requirements', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='pex_builder', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='jobs', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='typing', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='pip', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='interpreter_constraints', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='interpreter', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='finders', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='platforms', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='orderedset', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='common', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='pex_warnings', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='dist_metadata', is_pkg=False, path='pex', prefix='_pex'), _Importable(module='vendor', is_pkg=True, path='pex', prefix='_pex'), _Importable(module='third_party', is_pkg=True, path='pex', prefix='_pex')))
pex: un-imported pex.third_party.packaging
pex: un-imported pex.third_party.packaging.specifiers
pex: un-imported pex.vendor._vendored.packaging.packaging
pex: un-imported pex.vendor._vendored.packaging.packaging.__about__
pex: un-imported pex.vendor._vendored.packaging.packaging._compat
pex: un-imported pex.vendor._vendored.packaging.packaging._structures
pex: un-imported pex.vendor._vendored.packaging.packaging.markers
pex: un-imported pex.vendor._vendored.packaging.packaging.specifiers
pex: un-imported pex.vendor._vendored.packaging.packaging.tags
pex: un-imported pex.vendor._vendored.packaging.packaging.version
pex: un-imported pex.third_party.pyparsing
pex: un-imported pex.vendor._vendored.packaging.pyparsing
pex: un-imported pex.third_party.pkg_resources
pex: un-imported pex.third_party.pkg_resources.extern
pex: un-imported pex.third_party.pkg_resources.extern.packaging
pex: un-imported pex.third_party.pkg_resources.extern.packaging.markers
pex: un-imported pex.third_party.pkg_resources.extern.packaging.requirements
pex: un-imported pex.third_party.pkg_resources.extern.packaging.specifiers
pex: un-imported pex.third_party.pkg_resources.extern.packaging.version
pex: un-imported pex.third_party.pkg_resources.extern.pyparsing
pex: un-imported pex.vendor._vendored.setuptools.pkg_resources
pex: un-imported pex.vendor._vendored.setuptools.pkg_resources._vendor
pex: un-imported pex.vendor._vendored.setuptools.pkg_resources._vendor.packaging.__about__
pex: un-imported pex.vendor._vendored.setuptools.pkg_resources.extern
pex: un-imported pex.vendor._vendored.setuptools.pkg_resources.extern.appdirs
pex: un-imported pex.vendor._vendored.setuptools.pkg_resources.extern.packaging
pex: un-imported pex.vendor._vendored.setuptools.pkg_resources.extern.packaging._compat
pex: un-imported pex.vendor._vendored.setuptools.pkg_resources.extern.packaging._structures
pex: un-imported pex.vendor._vendored.setuptools.pkg_resources.extern.packaging.markers
pex: un-imported pex.vendor._vendored.setuptools.pkg_resources.extern.packaging.requirements
pex: un-imported pex.vendor._vendored.setuptools.pkg_resources.extern.packaging.specifiers
pex: un-imported pex.vendor._vendored.setuptools.pkg_resources.extern.packaging.version
pex: un-imported pex.vendor._vendored.setuptools.pkg_resources.extern.pyparsing
pex: un-imported pex.vendor._vendored.setuptools.pkg_resources.py31compat
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pex: un-imported <module 'pex.vendor._vendored.setuptools' from '/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.bootstrap/pex/vendor/_vendored/setuptools/__init__.py'>
pex: un-imported <module 'pex.vendor._vendored.packaging' from '/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.bootstrap/pex/vendor/_vendored/packaging/__init__.py'>
pex: un-imported <module 'pex.vendor._vendored' from '/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.bootstrap/pex/vendor/_vendored/__init__.py'>
pex: un-imported <module 'pex.vendor' from '/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.bootstrap/pex/vendor/__init__.py'>
pex: un-imported <module 'pex.variables' from '/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.bootstrap/pex/variables.py'>
pex: un-imported <module 'pex.util' from '/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.bootstrap/pex/util.py'>
pex: un-imported <module 'pex.typing' from '/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.bootstrap/pex/typing.py'>
pex: un-imported <module 'pex.tracer' from '/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.bootstrap/pex/tracer.py'>
pex: un-imported <module 'pex.third_party' from '/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.bootstrap/pex/third_party/__init__.py'>
pex: un-imported <module 'pex.platforms' from '/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.bootstrap/pex/platforms.py'>
pex: un-imported <module 'pex.pip' from '/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.bootstrap/pex/pip.py'>
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pex: un-imported <module 'pex.pex_info' from '/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.bootstrap/pex/pex_info.py'>
pex: un-imported <module 'pex.pex_builder' from '/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.bootstrap/pex/pex_builder.py'>
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pex: un-imported <module 'pex.orderedset' from '/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.bootstrap/pex/orderedset.py'>
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pex: un-imported <module 'pex.finders' from '/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.bootstrap/pex/finders.py'>
pex: un-imported <module 'pex.executor' from '/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.bootstrap/pex/executor.py'>
pex: un-imported <module 'pex.environment' from '/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.bootstrap/pex/environment.py'>
pex: un-imported <module 'pex.distribution_target' from '/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.bootstrap/pex/distribution_target.py'>
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Found link https://files.pythonhosted.org/packages/2d/43/64205493cfb4c8e1720208d73502a121ace2a195cd4d1d49bd7470e4fd92/black-18.6b4.tar.gz#sha256=22158b89c1a6b4eb333a1e65e791a3f8b998cf3b11ae094adb2570f31f769a44 (from https://pypi.org/simple/black/) (requires-python:>=3.6), version: 18.6b4
Found link https://files.pythonhosted.org/packages/2a/34/9938749f260a861cdd8427d63899e08f9a2a041159a26c2615b02828c973/black-18.9b0-py36-none-any.whl#sha256=817243426042db1d36617910df579a54f1afd659adb96fc5032fcf4b36209739 (from https://pypi.org/simple/black/) (requires-python:>=3.6), version: 18.9b0
Found link https://files.pythonhosted.org/packages/e8/5f/0f79fcd943ba465cbd4bf303c9794970c13a95e5456630de9f72e7f37ad4/black-18.9b0.tar.gz#sha256=e030a9a28f542debc08acceb273f228ac422798e5215ba2a791a6ddeaaca22a5 (from https://pypi.org/simple/black/) (requires-python:>=3.6), version: 18.9b0
Found link https://files.pythonhosted.org/packages/30/62/cf549544a5fe990bbaeca21e9c419501b2de7a701ab0afb377bc81676600/black-19.3b0-py36-none-any.whl#sha256=09a9dcb7c46ed496a9850b76e4e825d6049ecd38b611f1224857a79bd985a8cf (from https://pypi.org/simple/black/) (requires-python:>=3.6), version: 19.3b0
Found link https://files.pythonhosted.org/packages/89/07/aebb10fb8f2ffbac672dfbebffa724643bc84cf012a57737a622d1dabddb/black-19.3b0.tar.gz#sha256=68950ffd4d9169716bcb8719a56c07a2f4485354fec061cdd5910aa07369731c (from https://pypi.org/simple/black/) (requires-python:>=3.6), version: 19.3b0
Found link https://files.pythonhosted.org/packages/fd/bb/ad34bbc93d1bea3de086d7c59e528d4a503ac8fe318bd1fa48605584c3d2/black-19.10b0-py36-none-any.whl#sha256=1b30e59be925fafc1ee4565e5e08abef6b03fe455102883820fe5ee2e4734e0b (from https://pypi.org/simple/black/) (requires-python:>=3.6), version: 19.10b0
Found link https://files.pythonhosted.org/packages/b0/dc/ecd83b973fb7b82c34d828aad621a6e5865764d52375b8ac1d7a45e23c8d/black-19.10b0.tar.gz#sha256=c2edb73a08e9e0e6f65a0e6af18b059b8b1cdd5bef997d7a0b181df93dc81539 (from https://pypi.org/simple/black/) (requires-python:>=3.6), version: 19.10b0
Found link https://files.pythonhosted.org/packages/7d/b4/72fb7e851376edf60822318f42143f2984b42f2d69270a115acb6d0ed1e1/black-20.8b0.tar.gz#sha256=0fc6b2f00ccd34cc444d41f24967377c2bc6d0b53f333c56376405ff6cd6f789 (from https://pypi.org/simple/black/) (requires-python:>=3.6), version: 20.8b0
Found link https://files.pythonhosted.org/packages/dc/7b/5a6bbe89de849f28d7c109f5ea87b65afa5124ad615f3419e71beb29dc96/black-20.8b1.tar.gz#sha256=1c02557aa099101b9d21496f8a914e9ed2222ef70336404eeeac8edba836fbea (from https://pypi.org/simple/black/) (requires-python:>=3.6), version: 20.8b1
Given no hashes to check 42 links for project 'black': discarding no candidates
Using version 20.8b1 (newest of versions: 18.3a0, 18.3a1, 18.3a2, 18.3a3, 18.3a4, 18.4a0, 18.4a1, 18.4a2, 18.4a3, 18.4a4, 18.5b0, 18.5b1, 18.6b0, 18.6b1, 18.6b2, 18.6b3, 18.6b4, 18.9b0, 19.3b0, 19.10b0, 20.8b0, 20.8b1)
Collecting black
Created temporary directory: /tmp/pip-unpack-imio_gce
Looking up "https://files.pythonhosted.org/packages/dc/7b/5a6bbe89de849f28d7c109f5ea87b65afa5124ad615f3419e71beb29dc96/black-20.8b1.tar.gz" in the cache
No cache entry available
Starting new HTTPS connection (1): files.pythonhosted.org:443
https://files.pythonhosted.org:443 "GET /packages/dc/7b/5a6bbe89de849f28d7c109f5ea87b65afa5124ad615f3419e71beb29dc96/black-20.8b1.tar.gz HTTP/1.1" 200 1096433
Downloading black-20.8b1.tar.gz (1.1 MB)
|████████████████████████████████| 1.1 MB 707 kB/s eta 0:00:01  Ignoring unknown cache-control directive: immutable
Updating cache with response from "https://files.pythonhosted.org/packages/dc/7b/5a6bbe89de849f28d7c109f5ea87b65afa5124ad615f3419e71beb29dc96/black-20.8b1.tar.gz"
Caching due to etag
|████████████████████████████████| 1.1 MB 707 kB/s
Saved /tmp/tmpt3ltlh3v/usr.local.bin.python3.7/black-20.8b1.tar.gz
Added black from https://files.pythonhosted.org/packages/dc/7b/5a6bbe89de849f28d7c109f5ea87b65afa5124ad615f3419e71beb29dc96/black-20.8b1.tar.gz#sha256=1c02557aa099101b9d21496f8a914e9ed2222ef70336404eeeac8edba836fbea to build tracker '/tmp/pip-req-tracker-iad7wt7d'
Created temporary directory: /tmp/pip-build-env-f3a0lj2f
Running command /usr/local/bin/python3.7 /root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.deps/pip/pip install --ignore-installed --no-user --prefix /tmp/pip-build-env-f3a0lj2f/overlay --no-warn-script-location -v --no-binary :none: --only-binary :none: -i https://pypi.org/simple -- 'setuptools>=41.0' setuptools-scm wheel
Non-user install by explicit request
Created temporary directory: /tmp/pip-ephem-wheel-cache-xosyyour
Created build tracker: /tmp/pip-req-tracker-iad7wt7d
Entered build tracker: /tmp/pip-req-tracker-iad7wt7d
Created temporary directory: /tmp/pip-install-zbaj_ez2
1 location(s) to search for versions of setuptools:
* https://pypi.org/simple/setuptools/
Fetching project page and analyzing links: https://pypi.org/simple/setuptools/
Getting page https://pypi.org/simple/setuptools/
Found index url https://pypi.org/simple
Looking up "https://pypi.org/simple/setuptools/" in the cache
Request header has "max_age" as 0, cache bypassed
Starting new HTTPS connection (1): pypi.org:443
Incremented Retry for (url='/simple/setuptools/'): Retry(total=4, connect=None, read=None, redirect=None, status=None)
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate in certificate chain (_ssl.c:1091)'))': /simple/setuptools/
Starting new HTTPS connection (2): pypi.org:443
Incremented Retry for (url='/simple/setuptools/'): Retry(total=3, connect=None, read=None, redirect=None, status=None)
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate in certificate chain (_ssl.c:1091)'))': /simple/setuptools/
Starting new HTTPS connection (3): pypi.org:443
Incremented Retry for (url='/simple/setuptools/'): Retry(total=2, connect=None, read=None, redirect=None, status=None)
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate in certificate chain (_ssl.c:1091)'))': /simple/setuptools/
Starting new HTTPS connection (4): pypi.org:443
Incremented Retry for (url='/simple/setuptools/'): Retry(total=1, connect=None, read=None, redirect=None, status=None)
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate in certificate chain (_ssl.c:1091)'))': /simple/setuptools/
Starting new HTTPS connection (5): pypi.org:443
Incremented Retry for (url='/simple/setuptools/'): Retry(total=0, connect=None, read=None, redirect=None, status=None)
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate in certificate chain (_ssl.c:1091)'))': /simple/setuptools/
Starting new HTTPS connection (6): pypi.org:443
Could not fetch URL https://pypi.org/simple/setuptools/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/setuptools/ (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate in certificate chain (_ssl.c:1091)'))) - skipping
Given no hashes to check 0 links for project 'setuptools': discarding no candidates
ERROR: Could not find a version that satisfies the requirement setuptools>=41.0 (from versions: none)
Cleaning up...
Removed build tracker: '/tmp/pip-req-tracker-iad7wt7d'
ERROR: No matching distribution found for setuptools>=41.0
Exception information:
Traceback (most recent call last):
File "/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.deps/pip/pip/_internal/cli/base_command.py", line 172, in _main
status = self.run(options, args)
File "/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.deps/pip/pip/_internal/commands/install.py", line 384, in run
resolver.resolve(requirement_set)
File "/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.deps/pip/pip/_internal/legacy_resolve.py", line 185, in resolve
discovered_reqs.extend(self._resolve_one(requirement_set, req))
File "/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.deps/pip/pip/_internal/legacy_resolve.py", line 341, in _resolve_one
abstract_dist = self._get_abstract_dist_for(req_to_install)
File "/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.deps/pip/pip/_internal/legacy_resolve.py", line 289, in _get_abstract_dist_for
req.populate_link(self.finder, upgrade_allowed, require_hashes)
File "/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.deps/pip/pip/_internal/req/req_install.py", line 252, in populate_link
self.link = finder.find_requirement(self, upgrade)
File "/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.deps/pip/pip/_internal/index/package_finder.py", line 925, in find_requirement
'No matching distribution found for %s' % req
pip._internal.exceptions.DistributionNotFound: No matching distribution found for setuptools>=41.0
WARNING: You are using pip version 20.0.dev0; however, version 20.2.3 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
Installing build dependencies ... error
Removed black from https://files.pythonhosted.org/packages/dc/7b/5a6bbe89de849f28d7c109f5ea87b65afa5124ad615f3419e71beb29dc96/black-20.8b1.tar.gz#sha256=1c02557aa099101b9d21496f8a914e9ed2222ef70336404eeeac8edba836fbea from build tracker '/tmp/pip-req-tracker-iad7wt7d'
Removed build tracker: '/tmp/pip-req-tracker-iad7wt7d'
ERROR: Command errored out with exit status 1: /usr/local/bin/python3.7 /root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.deps/pip/pip install --ignore-installed --no-user --prefix /tmp/pip-build-env-f3a0lj2f/overlay --no-warn-script-location -v --no-binary :none: --only-binary :none: -i https://pypi.org/simple -- 'setuptools>=41.0' setuptools-scm wheel Check the logs for full command output.
Exception information:
Traceback (most recent call last):
File "/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.deps/pip/pip/_internal/cli/base_command.py", line 172, in _main
status = self.run(options, args)
File "/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.deps/pip/pip/_internal/commands/download.py", line 146, in run
resolver.resolve(requirement_set)
File "/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.deps/pip/pip/_internal/legacy_resolve.py", line 185, in resolve
discovered_reqs.extend(self._resolve_one(requirement_set, req))
File "/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.deps/pip/pip/_internal/legacy_resolve.py", line 341, in _resolve_one
abstract_dist = self._get_abstract_dist_for(req_to_install)
File "/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.deps/pip/pip/_internal/legacy_resolve.py", line 290, in _get_abstract_dist_for
abstract_dist = self.preparer.prepare_linked_requirement(req)
File "/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.deps/pip/pip/_internal/operations/prepare.py", line 544, in prepare_linked_requirement
req, self.req_tracker, self.finder, self.build_isolation,
File "/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.deps/pip/pip/_internal/operations/prepare.py", line 97, in _get_prepared_distribution
abstract_dist.prepare_distribution_metadata(finder, build_isolation)
File "/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.deps/pip/pip/_internal/distributions/source.py", line 38, in prepare_distribution_metadata
self._setup_isolation(finder)
File "/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.deps/pip/pip/_internal/distributions/source.py", line 68, in _setup_isolation
"Installing build dependencies"
File "/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.deps/pip/pip/_internal/build_env.py", line 201, in install_requirements
call_subprocess(args, spinner=spinner)
File "/root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.deps/pip/pip/_internal/utils/subprocess.py", line 242, in call_subprocess
raise InstallationError(exc_msg)
pip._internal.exceptions.InstallationError: Command errored out with exit status 1: /usr/local/bin/python3.7 /root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5/.deps/pip/pip install --ignore-installed --no-user --prefix /tmp/pip-build-env-f3a0lj2f/overlay --no-warn-script-location -v --no-binary :none: --only-binary :none: -i https://pypi.org/simple -- 'setuptools>=41.0' setuptools-scm wheel Check the logs for full command output.
pid 64 -> /usr/local/bin/python3.7 /root/.pex/pip.pex/a8ebd39cfba0316d0416132e488ffc14d28893b5 --disable-pip-version-check --isolated --no-python-version-warning --exists-action a -vvv --cache-dir /root/.pex download --dest /tmp/tmpt3ltlh3v/usr.local.bin.python3.7 --header Cache-Control:max-age=3600 --retries 5 --timeout 15 --cert /ca-cert.crt black setuptools exited with 1 and STDERR:
None

# Fixed code
def spawn_download_distributions(
    self,
    download_dir,  # type: str
    requirements=None,  # type: Optional[Iterable[str]]
    requirement_files=None,  # type: Optional[Iterable[str]]
    constraint_files=None,  # type: Optional[Iterable[str]]
    allow_prereleases=False,  # type: bool
    transitive=True,  # type: bool
    target=None,  # type: Optional[DistributionTarget]
    package_index_configuration=None,  # type: Optional[PackageIndexConfiguration]
    cache=None,  # type: Optional[str]
    build=True,  # type: bool
    manylinux=None,  # type: Optional[str]
    use_wheel=True,  # type: bool
):
    # type: (...) -> Job
    target = target or DistributionTarget.current()

    platform = target.get_platform()
    if not use_wheel:
        if not build:
            raise ValueError(
                "Cannot both ignore wheels (use_wheel=False) and refrain from building "
                "distributions (build=False)."
            )
        elif target.is_foreign:
            raise ValueError(
                "Cannot ignore wheels (use_wheel=False) when resolving for a foreign "
                "platform: {}".format(platform)
            )

    download_cmd = ["download", "--dest", download_dir]
    if target.is_foreign:
        # We're either resolving for a different host / platform or a different interpreter for
        # the current platform that we have no access to; so we need to let pip know and not
        # otherwise pickup platform info from the interpreter we execute pip with.
        if manylinux and platform.platform.startswith("linux"):
            download_cmd.extend(
                ["--platform", platform.platform.replace("linux", manylinux, 1)]
            )
        download_cmd.extend(["--platform", platform.platform])
        download_cmd.extend(["--implementation", platform.impl])
        download_cmd.extend(["--python-version", platform.version])
        download_cmd.extend(["--abi", platform.abi])

    if target.is_foreign or not build:
        download_cmd.extend(["--only-binary", ":all:"])

    if not use_wheel:
        download_cmd.extend(["--no-binary", ":all:"])

    if allow_prereleases:
        download_cmd.append("--pre")

    if not transitive:
        download_cmd.append("--no-deps")

    if requirement_files:
        for requirement_file in requirement_files:
            download_cmd.extend(["--requirement", requirement_file])

    if constraint_files:
        for constraint_file in constraint_files:
            download_cmd.extend(["--constraint", constraint_file])

    if requirements:
        download_cmd.extend(requirements)

    return self._spawn_pip_isolated(
        download_cmd,
        package_index_configuration=package_index_configuration,
        cache=cache,
        interpreter=target.get_interpreter(),
    )