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pythonshscripting-language

sh script equivalent of python script

Ok, so I have the following situation. I need to edit the PYTHONPATH dynamically on a target PC. Now the structure of the project is:

trunk
     bin
        start_script
     dependencies
        dependencies

From python I could do, from start_script:

root_path = os.path.split(os.path.dirname(os.path.abspath(__file__)))[0]
dependencies_root = os.path.join(root_path, 'dependencies')
from sys import path
path.extend([root_path, dependencies_root])

This would do the trick but I need to start new python processes with process.Popen and the changes to sys.path are gone by then it seems.

Now I was thinking a sh script would do the job better here, unfortunately I'm a total noob here and have no idea how to proceed. The sh script should do basically the things the python from above did, so:

[1] Get the absolute path of the directory the script is located
[2] Get the parent of that folder (say parent_path)
[3] export PYTHONPATH=$PYTHONPATH:parent_path
[4] python start_script.py

So basically the first two steps are the ones I need help with. Also if there is a way to make changes to python's sys.path persist on a subprocess opened with subprocess.Popen please let me know.

Solution

  • You could just update the PYTHONPATH environment variable at the same moment you update sys.path in start_script, using the os.environ dict.