pip-sync uses first pip script on PATH instead of the one from the Python version it is run with

[kb-1000]

Describe the issue briefly here.

Environment Versions

1. OS Type: Android 8.1 aarch64/Latest Termux
2. Python version: 3.7.2
3. pip version: pip 18.1 from /data/data/com.termux/files/usr/lib/python2.7/site-packages/pip (python 2.7) (pip3.7 --version is `pip 19.0.2 from /data/data/com.termux/files/usr/lib/python3.7/site-packages/pip (python 3.7)
4. pip-tools version: pip-compile, version 3.3.2

Steps to replicate

1. Get Termux
2. Run pkg up && pkg install python python2
3. Install pip on Python 3 (get-pip.py)
4. Install pip on Python 2 (get-pip.py)
5. Install piptools on Python 3
6. Use pip-sync with a requirements.txt file and watch it installing to Python 2

Expected result

Installs into Python 3 if ran on Python 3 and to Python 2 if ran on Python2

Actual result

Installs to whichever Python version pip script on PATH is from

Extra information

If using Python 2 and 3 together, an extra pip-compile and pip-sync script per Python major and per Python minor version to be able to select Python version to run piptools on would be very useful.

[atugushev]

Hello @kaeptmblaubaer1000,

Thank you for the detailed report! The issue is probably here:

pip-tools/piptools/sync.py

Lines 140 to 141 in 200bc6b

	# find pip in same directory as pip-sync entry-point script
	pip = os.path.join(os.path.dirname(os.path.abspath(sys.argv[0])), 'pip')

Since pip uses python2.7 it would install packages to python2. I think pip-sync should decide to use pip2 or pip3, depending on python's version.

[kb-1000]

Or use console_scripts.pip entry point and execute it inside the script.

[Asurasaintking]

I'm getting an : unable to locate pip
Error message