运行裤子构建时无法安装加密

Question

I try to run a dockerized pants build for a scala project and it fails with an error message " error in cryptography setup command: Invalid environment marker: python_version < '3' ". I haven't manually specified anything to install cryptography. In the documentation of cryptography I could see that it happens either because of pip or setuptools is out of date. I tried to update this as well. But in case of pants I'm not very sure where should I specify this also. I specified this in pants file and in thidparty " requirements.txt " file. But no difference . It was working fine but suddenly it failed one day.

I use the following versions of

Ubuntu -14.04

python -2.7.4

pants -1.0.0 (tried upgrading to 1.1.0 but no difference)

Answer 1

Explicitly mentioning following versions in requirements.txt for pants builds will resolve the issue

pycparser==2.17 cryptography==2.0.1