attrs minimum dependency

[jayvdb]

[   32s] [149/230] cumulate python2-attrs-17.4.0-lp151.2.2
...
[   86s] ImportError while loading conftest '/home/abuild/rpmbuild/BUILD/requirementslib-1.4.2/tests/conftest.py'.
[   86s] /usr/lib/python2.7/site-packages/six.py:709: in exec_
[   86s]     exec("""exec _code_ in _globs_, _locs_""")
[   86s] tests/conftest.py:10: in <module>
[   86s]     import requirementslib.utils
[   86s] ../../BUILDROOT/python-requirementslib-1.4.2-lp151.3.1.x86_64/usr/lib/python2.7/site-packages/requirementslib/__init__.py:9: in <module>
[   86s]     from .models.lockfile import Lockfile
[   86s] ../../BUILDROOT/python-requirementslib-1.4.2-lp151.3.1.x86_64/usr/lib/python2.7/site-packages/requirementslib/models/lockfile.py:15: in <module>
[   86s]     from .requirements import Requirement
[   86s] ../../BUILDROOT/python-requirementslib-1.4.2-lp151.3.1.x86_64/usr/lib/python2.7/site-packages/requirementslib/models/requirements.py:43: in <module>
[   86s]     from .setup_info import SetupInfo, _prepare_wheel_building_kwargs
[   86s] ../../BUILDROOT/python-requirementslib-1.4.2-lp151.3.1.x86_64/usr/lib/python2.7/site-packages/requirementslib/models/setup_info.py:454: in <module>
[   86s]     class Extra(object):
[   86s] ../../BUILDROOT/python-requirementslib-1.4.2-lp151.3.1.x86_64/usr/lib/python2.7/site-packages/requirementslib/models/setup_info.py:456: in Extra
[   86s]     requirements = attr.ib(factory=frozenset, cmp=True, type=frozenset)
[   86s] E   TypeError: attrib() got an unexpected keyword argument 'factory'

A quick scan through history of attrs suggests this is the functionality needed python-attrs/attrs@780e1e5 , and thus the minimum version needed is at least 18.1.0

[techalchemy]

definitely, thanks for the report

feel free to PR a pin for this if you like (I'd be glad to do it also) & sorry for the bug!