detect source directory in setup.py while installing with pip - python-3.x

Question

Is there a way to find the original source directory path in setup.py while install the package being from the source directory?
For example my source code is in
cd /home/jumbo/project/
ls -ltr
Pipfile Pipfile.lock README.md bin src_code setup.py
Being in the above directory, i run 'pip3 install .'
In setup.py, i want to capture the git source directory path (/home/jumbo/project/) and write the commit hash of the git code to a file.
The git source path is not constant as it changes for each user whoever installing the setup.
git -C /home/jumbo/project/ rev-parse HEAD > hash.txt
Thanks for checking.
This is my setup.py code
import os.path
import subprocess
from setuptools import setup
from setuptools.command.install import install
class IW(install):
def run(self):
repo_path = os.path.dirname(os.path.realpath(__file__))
print ("REPO_PATH:", repo_path)
command = 'git -C ' + repo_path + ' rev-parse HEAD > hash.txt'
execute_command = subprocess.Popen(command, shell=True, stdout=subprocess.PIPE)
execute_command.communicate()
if execute_command.returncode != 0:
raise OSError("Command %s failed" % command)
install.run(self)
setup(name='jumbo_deploy',
version='1.1.0',
url='https://github.com/src/jumbo-deploy',
license='Copyright Jumbo 2018',
packages=['jumbo_deploy'],
install_requires=[
'argparse',
'requests',
],
zip_safe=False,
package_data={'jumbo_deploy': ['hash.txt']},
include_package_data=True,
scripts=['bin/jumbo_deploy'],
cmdclass={
'install': IW,
}
)
+++++ END of my setup.py ++++
Currently with the above setup.py, my function run(self) is being executed after creating and changing the directory to some random
user1 $ cd /home/jumbo/project/
user1 $ pip3 install . --upgrade -v
Created temporary directory: /private/var/folders/_w/sv2ms8pd0zl38l3lyy6f787w005lxf/T/pip-ephem-wheel-cache-w28h4dpd
Created temporary directory: /private/var/folders/_w/sv2ms8pd0zl38l3lyy6f787w005lxf/T/pip-req-tracker-pc07b4yn
Created requirements tracker '/private/var/folders/_w/sv2ms8pd0zl38l3lyy6f787w005lxf/T/pip-req-tracker-pc07b4yn'
Created temporary directory: /private/var/folders/_w/sv2ms8pd0zl38l3lyy6f787w005lxf/T/pip-install-wqohpdxt
Processing /home/jumbo/project
Created temporary directory: /private/var/folders/_w/sv2ms8pd0zl38l3lyy6f787w005lxf/T/pip-req-build-1df74t7f
Added file:////home/jumbo/project/ to build tracker '/private/var/folders/_w/sv2ms8pd0zl38l3lyy6f787w005lxf/T/pip-req-tracker-pc07b4yn'
Running setup.py (path:/private/var/folders/_w/sv2ms8pd0zl38l3lyy6f787w005lxf/T/pip-req-build-1df74t7f/setup.py) egg_info for package from file:///home/jumbo/project/
Running command python setup.py egg_info
REPO_PATH:/private/var/folders/_w/sv2ms8pd0zl38l3lyy6f787w005lxf/T/pip-req-build-1df74t7f
========
I'm expecting REPO_PATH:/home/jumbo/project
but seems before my setup code runs, it already changed the directory to /private/var/folders/_w/sv2ms8pd0zl38l3lyy6f787w005lxf/T/pip-req-build-1df74t7f

Answer 1

I am pretty sure you can not do this reliably with a custom setuptools command, and even more unlikely with a custom install command. Indeed (as you correctly noticed) you have little control over where, when this command actually runs.
You probably should look more into customizing the sdist, build, and develop commands. These are usually run directly from within the original source directory. You will need to get at least these 3, probably more, to hit all the cases, and that might not even be enough.
Next you could try with a custom egg_info command (if I understood right, more or less all commands will run egg_info at some point), but I haven't looked much into it and it might be more tricky than it looks to get all the cases right.
Also look at the setuptools documentation on "Extending and Reusing Setuptools" for more ideas where to hook up your custom code.
Finally you might have better luck with setuptools-scm and in particular its write_to option, either using it directly or looking at its code for inspiration.