Target: Auto execute python selenium script at startup. My current solution worked for like half a year but after updating my pi 3 days ago, python crashes with this exception: selenium.common.exceptions.WebDriverException: Message: unknown error: DevToolsActivePort file doesn't exist.
This is my init code:
chrome_options = webdriver.ChromeOptions()
chrome_options.add_argument('--no-sandbox')
chrome_options.add_argument('--headless')
chrome_options.add_argument('--disable-dev-shm-usage')
browser = webdriver.Chrome(chrome_options=chrome_options, service_args=["--verbose", "--log-path=/home/pi/chromedriver.log"])
browser.implicitly_wait(10)
browser.set_window_size(800, 600)
browser.get(...)
And the chromedriver returns:
[1571045268,786][INFO]: Launching chrome: /usr/bin/chromium-browser --disable-background-networking --disable-client-side-phishing-detection --disable-default-apps --disable-dev-shm-usage --disable-hang-monitor --disable-popup-blocking --disable-prompt-on-repost --disable-sync --disable-web-resources --enable-automation --enable-logging --force-fieldtrials=SiteIsolationExtensions/Control --headless --ignore-certificate-errors --load-extension=/tmp/.org.chromium.Chromium.ka9jxU/internal --log-level=0 --metrics-recording-only --no-first-run --no-sandbox --password-store=basic --remote-debugging-port=0 --test-type=webdriver --use-mock-keychain --user-data-dir=/tmp/.org.chromium.Chromium.13RyA2 data:,
: getrandom indicates that the entropy pool has not been initialized. Rather than continue with poor entropy, this process will block until entropy is available.
[1571045328,829][INFO]: Failed to connect to Chrome. Attempting to kill it.
[1571045328,842][INFO]: [4c8ff7afd4ca8a1d7e7d0313509df6dc] RESPONSE InitSession ERROR unknown error: DevToolsActivePort file doesn't exist
[1571045328,842][DEBUG]: Log type 'driver' lost 0 entries on destruction
[1571045328,842][DEBUG]: Log type 'browser' lost 0 entries on destruction
[0100/000000.682302:ERROR:zygote_linux.cc(660)] write: Datenübergabe unterbrochen (broken pipe) (32)
I'm using the autostart file ~/.config/lxsession/LXDE-pi/autostart and this command: @/home/pi/script/main.py > /home/pi/script.log 2>&1 & by the way main.py is flaged as an executable and uses python3.
I have no problem what so ever if I manually start the script via ssh. So I assume that it is caused by missing environment variables or something like that during the start-up / auto-start process causing chromium to crash. As you can see I already tried the answer of this stack overflow question.
My current chromium version is Chromium 72.0.3626.121 Built on Raspbian , running on Raspbian 9.11 and
the chromedriver version is ChromeDriver 72.0.3626.121
I found the answer myself and it was caused by getrandom indicates that the entropy pool has not been initialized. Rather than continue with poor entropy, this process will block until entropy is available. which indicates a missing entropy source causing the chromedriver to crash because it takes to long to establish an entropy source. All I had to do was installing rng-tools and the script did not crash. For more details read this blog post which helped me to fix this problem.