# Buggy code
def _get_session_python_site_packages_dir(session):
    try:
        site_packages_dir = session._runner._site_packages_dir
    except AttributeError:
        site_packages_dir = session.run(
            "python",
            "-c"
            "import sys; from distutils.sysconfig import get_python_lib; sys.stdout.write(get_python_lib())",
            silent=True,
            log=False,
            bypass_install_only=True,
        )
        session._runner._site_packages_dir = site_packages_dir
    return site_packages_dir


# Traceback (AttributeError)
test: [ERROR   ] An un-handled exception was caught by salt's global exception handler:
test: AttributeError: 'unicode' object has no attribute 'name'
test: Traceback (most recent call last):
test:   File "/bin/spm", line 12, in <module>
test:     salt_spm()
test:   File "/usr/lib/python2.7/site-packages/salt/scripts.py", line 527, in salt_spm
test:     spm.run()
test:   File "/usr/lib/python2.7/site-packages/salt/cli/spm.py", line 41, in run
test:     client.run(self.args)
test:   File "/usr/lib/python2.7/site-packages/salt/spm/__init__.py", line 125, in run
test:     self._install(args)
test:   File "/usr/lib/python2.7/site-packages/salt/spm/__init__.py", line 379, in _install
test:     self._install_indv_pkg(package, out_file)
test:   File "/usr/lib/python2.7/site-packages/salt/spm/__init__.py", line 532, in _install_indv_pkg
test:     self.files_conn)
test:   File "/usr/lib/python2.7/site-packages/salt/spm/__init__.py", line 161, in _pkgfiles_fun
test:     return self.pkgfiles['{0}.{1}'.format(self.files_prov, func)](*args, **kwargs)
test:   File "/usr/lib/python2.7/site-packages/salt/spm/pkgfiles/local.py", line 147, in install_file
test:     member.name = new_name.name.replace('{0}/'.format(package), '')
test: AttributeError: 'unicode' object has no attribute 'name'
test: Traceback (most recent call last):
test:   File "/bin/spm", line 12, in <module>
test:     salt_spm()
test:   File "/usr/lib/python2.7/site-packages/salt/scripts.py", line 527, in salt_spm
test:     spm.run()
test:   File "/usr/lib/python2.7/site-packages/salt/cli/spm.py", line 41, in run
test:     client.run(self.args)
test:   File "/usr/lib/python2.7/site-packages/salt/spm/__init__.py", line 125, in run
test:     self._install(args)
test:   File "/usr/lib/python2.7/site-packages/salt/spm/__init__.py", line 379, in _install
test:     self._install_indv_pkg(package, out_file)
test:   File "/usr/lib/python2.7/site-packages/salt/spm/__init__.py", line 532, in _install_indv_pkg
test:     self.files_conn)
test:   File "/usr/lib/python2.7/site-packages/salt/spm/__init__.py", line 161, in _pkgfiles_fun
test:     return self.pkgfiles['{0}.{1}'.format(self.files_prov, func)](*args, **kwargs)
test:   File "/usr/lib/python2.7/site-packages/salt/spm/pkgfiles/local.py", line 147, in install_file
test:     member.name = new_name.name.replace('{0}/'.format(package), '')
test: AttributeError: 'unicode' object has no attribute 'name'

# Fixed code
def _get_session_python_site_packages_dir(session):
    try:
        site_packages_dir = session._runner._site_packages_dir
    except AttributeError:
        old_install_only_value = session._runner.global_config.install_only
        try:
            # Force install only to be false for the following chunk of code
            # For additional information as to why see:
            #   https://github.com/theacodes/nox/pull/181
            session._runner.global_config.install_only = False
            site_packages_dir = session.run(
                "python",
                "-c"
                "import sys; from distutils.sysconfig import get_python_lib; sys.stdout.write(get_python_lib())",
                silent=True,
                log=False,
            )
            session._runner._site_packages_dir = site_packages_dir
        finally:
            session._runner.global_config.install_only = old_install_only_value
    return site_packages_dir