How to correctly initialize git submodules in Dockerfile for Docker Cloud
See the answer I gave here: https://stackoverflow.com/a/59640438/1021344
Reproduced here for simplicity:You need to use hooks: https://docs.docker.com/docker-hub/builds/advanced/#custom-build-phase-hooks
TL;DR: Place this in hooks/post_checkout:
#!/bin/bash# Docker hub does a recursive clone, then checks the branch out,# so when a PR adds a submodule (or updates it), it fails.git submodule update --init