pip-sync does not upgrade existing packages

[tekumara]

Environment Versions

1. OS Type
2. Python version: 3.6.9
3. pip version: pip 19.3.1
4. pip-tools version: pip-sync, version 4.3.0

Steps to replicate

# run the following in a new virtualenv

$ pip install boto3==1.10.44 pyjq==2.3.1 pytoml==0.1.20 argh==0.26.2

$ pip freeze
argh==0.26.2
boto3==1.10.44
botocore==1.13.44
docutils==0.15.2
jmespath==0.9.4
pyjq==2.3.1
python-dateutil==2.8.1
pytoml==0.1.20
s3transfer==0.2.1
six==1.13.0
urllib3==1.25.7

$ cat requirements.txt
#
# This file is autogenerated by pip-compile
# To update, run:
#
#    pip-compile
#
argh==0.26.2
boto3==1.10.43
botocore==1.13.44         # via boto3, s3transfer
docutils==0.15.2          # via botocore
jmespath==0.9.4           # via boto3, botocore
pyjq==2.4.0
python-dateutil==2.8.1    # via botocore
pytoml==0.1.21
s3transfer==0.2.1         # via boto3
six==1.13.0               # via python-dateutil
urllib3==1.25.7           # via botocore

$ pip-sync
Everything up-to-date

Expected result

That the following up/downgrades would occur:

boto3 1.10.44 -> 1.10.43
pyjq 2.3.1 > 2.4.0
pytoml 0.1.20 -> 0.1.21

Actual result

No up/downgrades occurred.

[atugushev]

Hello @tekumara

Thanks for the issue. I can't reproduce it locally. Perhaps, you run the pip-sync installed in other virtual environments, where the packages are already upgraded. Could you check the python, pip and pip-sync paths by running the following commands?

• which python
• which pip
• which pip-sync

Thanks!

[tekumara]

Ah.. So I installed pip-tools using pipx into its own virtualenv because I didn't want to pollute my project's requirements.txt with pip-tools.

This is what I have

$ which python
/Users/tekumara/.virtualenvs/my-project/bin/python

$ which pip
/Users/tekumara/.virtualenvs/my-project/bin/pip

$ which pip-sync
/Users/tekumara/.local/bin/pip-sync

Is it possible to make pip-sync work when installed in its own virtualenv?

[atugushev]

I see. You don't have to put pip-tools to requirements.txt, but make sure that pip-tools installed in the virtual environment.

[atugushev]

Is it possible to make pip-sync work when installed in its own virtualenv?

Unfortunately not. pip-tools must be installed in the virtual environment.

[tekumara]

Gotcha. That wasn't intuitive to me. Would you accept a PR to mention this in README.md?

[atugushev]

Great idea. PR is highly welcomed!