Cypress with Docker

Debugging a Failed to connect to the bus: Failed to connect to socket /run/dbus/system_bus_socket: No such file or directory error message

Test environment

• docker: Docker version 19.03.5-ce, build 633a0ea838
• docker-compose: docker-compose version 1.25.1, build unknown
• bash: 5.0.11(1)-release
• kernel: Linux 5.4.10-arch1-1

Execution

• ./test-all.sh

Errors

When using ELECTRON_ENABLE_LOGGING=true

[...]

>>> Running test *with* Electron logging:  ELECTRON_ENABLE_LOGGING=true
Fontconfig warning: "/etc/fonts/fonts.conf", line 100: unknown element "blank"
[17:0111/175459.790006:ERROR:bus.cc(393)] Failed to connect to the bus: Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory

[...]

[17:0111/175503.921736:ERROR:bus.cc(393)] Failed to connect to the bus: Address does not contain a colon
[215:0111/175504.814871:ERROR:child_process_sandbox_support_impl_linux.cc(81)] FontService unique font name matching request did not receive a response.
[215:0111/175504.821682:ERROR:child_process_sandbox_support_impl_linux.cc(81)] FontService unique font name matching request did not receive a response.
[215:0111/175504.822100:ERROR:child_process_sandbox_support_impl_linux.cc(81)] FontService unique font name matching request did not receive a response.

[...]

Fixing the errors

By exposing the host socket /var/run/dbus/system_bus_socket to the container we remove the error.

Credits

The fix was inspired by the documentation of x11docker

• https://github.com/mviereck/x11docker/wiki/How-to-connect-container-to-DBus-from-host