This allows to run the daemon in environments that have upstream containerd installed. Signed-off-by: Tibor Vass <tibor@docker.com> (cherry picked from commit 34eede0296bce6a9c335cb429f10728ae3f4252d) Signed-off-by: Tibor Vass <tibor@docker.com> Upstream-commit: b3bb2aabb8ed5a8af0a9f48fb5aba3f39af38e0d Component: engine
docker.go contains Docker daemon's main function.
This file provides first line CLI argument parsing and environment variable setting.