Can't install google-cloud via pip-compile

[scjody]

pip-compile fails when requirements.in contains google-cloud.

Environment Versions

1. OS Type: Ubuntu 14.04.05 LTS
2. Python version: $ python -V: Python 2.7.6
3. pip version: $ pip --version: pip 8.1.2 from /usr/local/lib/python2.7/dist-packages (python 2.7)
4. pip-tools version: $ pip-compile --version pip-compile, version 1.9.0

Steps to replicate

1. mkdir /tmp/pip-compile
2. echo google-cloud > requirements.in
3. pip-compile

Expected result

A requirements.txt file is generated containing google-cloud and its dependencies.

Actual result

vagrant@vagrant:/tmp/pip-compile$ pip-compile
Could not find a version that matches google-cloud-logging<0.25dev,<2.0dev,>=0.24.0,>=1.0.0
Tried: 0.20.0, 0.20.0, 0.21.0, 0.21.0, 0.22.0, 0.22.0, 0.23.0, 0.23.0, 0.23.1, 0.23.1, 0.24.0, 0.24.0, 1.0.0, 1.0.0

Note that pip install google-cloud (without pip-tools) succeeds.

[j-walker23]

Do you have oauth2client==4.0.0? Mine also fails unless i go down to oauth2client==3.0.0. I can not find any way to force pip-compile. Is there a way?

[scjody]

@j-walker23 The machine I'm currently trying to run pip-compile on has oauth2client==3.0.0. Upgrading to 4.0.0 or removing oauth2client completely does not affect my ability to run pip-compile as shown above.

[davidovich]

I believe the sub-dependencies are pinned incorrectly for this package.

If I run:

echo google-cloud | pip-compile -v -U -o req.txt - | grep google-cloud-logging

We can see the culprit in the output:

google-cloud-error-reporting==0.24.1 requires gapic-google-cloud-error-reporting-v1beta1<0.16dev,>=0.15.0, google-cloud-core<0.25dev,>=0.24.0, google-cloud-logging<2.0dev,>=1.0.0

google-cloud-error-reporting==0.24.1 requires google-cloud-logging<2.0dev,>=1.0.0. This constraint cannot be satisfied, so there is currently no solution.

A workaround would be to pin arificially the dependency that requires google-cloud-logging>=1.0.0:

echo -e 'google-cloud\ngoogle-cloud-error-reporting<=0.24' | pip-compile -v -U -o req.txt -

[j-walker23]

Thanks for your help @davidovich!

[davidovich]

Closing as not a defect in pip-tools (but it is probably a defect of google-cloud package versioning)

[scjody]

There's already a google-cloud issue open - see above.

I thought that any dependencies that pip could deal with would also work with pip-compile. Sorry I was mistaken.

[davidovich]

Pip does not do constraint validation, so it is possible to install conflicting packages. These conflicts may or may not allow correct runtime behaviour, but pip-tools will fail because the constraints are the only contract that it can follow. It is telling you that you have an invalid configuration (according to the authors of the sum of sub packages).