podman/docker/podman-docker.sh

# DOCKER_HOST initialization

if [ -z "$DOCKER_HOST" ]; then
    if [ $(id -u) -eq 0 ]; then
	export DOCKER_HOST=unix:///run/podman/podman.sock
    else
	if [ -n "$XDG_RUNTIME_DIR" ]; then
	    export DOCKER_HOST=unix://$XDG_RUNTIME_DIR/podman/podman.sock
	fi
    fi
fi