elopio@calchas:~/workspace/canonical/snapcraft$ UBUNTU_STORE_API_ROOT_URL=https://myapps.developer.staging.ubuntu.com/dev/api/ UBUNTU_STORE_UPLOAD_ROOT_URL=https://upload.apps.staging.ubuntu.com/ UBUNTU_SSO_API_ROOT_URL=https://login.staging.ubuntu.com/api/v2/ ./bin/snapcraft login                        
Enter your Ubuntu One SSO credentials.
Email: test
Password: 
One-time password (just press enter if you don't use two-factor authentication): 
Authenticating against Ubuntu One SSO.
[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed
(_ssl.c:645)