Got it, let's tackle this permission error you're hitting with geckodriver on Heroku. This is a common hiccup when using that Firefox buildpack, but it's easy to fix once you know the root cause.

The Problem #

The evosystem-jp/heroku-buildpack-firefox installs geckodriver, but it doesn't always set the executable bit (+x) on the file. Selenium needs that permission to run the driver, hence the error you're seeing.

Step-by-Step Solution #

1. Add a post-build script to fix geckodriver permissions

First, create a shell script in your project root called fix-geckodriver-perms.sh with this content:

#!/bin/bash
chmod +x /app/vendor/geckodriver

Make sure to mark this script as executable locally too (run chmod +x fix-geckodriver-perms.sh before pushing to Heroku).

Then update your Procfile to include a release phase that runs this script before your worker starts:

release: ./fix-geckodriver-perms.sh
worker: python your-bot-script.py  # Replace with your actual script filename

2. Double-check your environment variables

Sometimes the Firefox binary path from the buildpack is slightly different than expected. Run this command to confirm the exact path:

heroku run ls /app/vendor/firefox

You might find the binary is at /app/vendor/firefox/firefox instead of just /app/vendor/firefox. Update your FIREFOX_BIN environment variable to match the correct path if needed.

3. Tweak your InstaPy initialization code

Heroku's container environment needs a few extra browser flags to run Firefox headless properly. Update your code to explicitly set these options:

from instapy import InstaPy
from selenium.webdriver.firefox.options import Options
import os

# Configure Firefox for Heroku's headless environment
firefox_options = Options()
firefox_options.add_argument("--headless")
firefox_options.add_argument("--disable-gpu")
firefox_options.add_argument("--no-sandbox")  # Critical for containerized environments
firefox_options.binary_location = os.environ.get("FIREFOX_BIN")

# Initialize the InstaPy session
session = InstaPy(
    username="USERNAME",
    password="PASSWORD",
    geckodriver_path=os.environ.get("GECKODRIVER_PATH"),
    browser_executable_path=os.environ.get("FIREFOX_BIN"),
    browser_options=firefox_options
)

session.login()

4. Verify buildpack order

Ensure your buildpacks are in the right order (Python first, then the Firefox buildpack). Check with:

heroku buildpacks

If not, reorder them:

heroku buildpacks:add --index 1 heroku/python
heroku buildpacks:add --index 2 https://github.com/evosystem-jp/heroku-buildpack-firefox

Why This Works #

• The chmod +x command gives geckodriver the executable permission it was missing.
• The --no-sandbox flag bypasses security restrictions that would prevent Firefox from running in Heroku's container.
• Explicit browser options ensure headless mode runs reliably without unexpected issues.

Quick Debug Check #

If you're still stuck, run this command to confirm geckodriver has the right permissions after deployment:

heroku run ls -l /app/vendor/geckodriver

You should see permissions like -rwxr-xr-x (the x means executable).

内容的提问来源于stack exchange，提问作者Sumit Jaiswal