bak-rest-drone crashes for non-root user

[tobiasdam]

When running the container with non-root user Selenium crashes with following exception:

   raise exception_class(message, screen, stacktrace)\n'
              'selenium.common.exceptions.SessionNotCreatedException: Message: '
              'session not created: Chrome failed to start: exited normally.\n'
              "  (session not created: DevToolsActivePort file doesn't exist)\n"
              '  (The process started from chrome location '
              '/usr/bin/chromium-browser is no longer running, so ChromeDriver '
              'is assuming that Chrome has crashed.)\n'

starting chromium inside the container with chromium --headless=new --no-sandbox resulted in:

chrome_crashpad_handler: --database is required
Try 'chrome_crashpad_handler --help' for more information.

strace -c -f chromium --headless=new --no-sandbox showed:

[0531/142448.613680:ERROR:socket.cc(120)] recvmsg: Connection reset by peer (104)

This happened on a linux host - the same image and configuration worked fined on wsl2

[tobiasdam]

After searching and trying various things I found this

Apparently chromium cannot create the default directories for the following variables and setting them to a writable directory fixes the issues:

- name: XDG_CONFIG_HOME
  value: /tmp/.chromium
- name: XDG_CACHE_HOME
  value: /tmp/.chromium

I don't really know why the previous config worked on WSL2, but I guess some kernel differences lead to chromium doing things a different way.

(I found that WSL2 has no user namespaces(see this) and no /proc/sys/kernel/yama/ptrace_scope)