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1d499f2ce4
This script had two main functions: 1. Select the graphdriver This functionality is now handled in the docker daemon. It defaults to overlay2 on recent docker versions, and does its own fs detection for btrfs etc. We carry a patch for 1.12.6 now to prefer overlay to devicemapper 2. Avoid enabling selinux on btrfs This no longer matters since as of v1.10, selinux on btrfs is supported. See moby/moby#16452 This PR replaces that original functionality with a simpler systemd environment variable, which is also more in-line with what we do for other similar choices. The environment variable is also more discoverable and easier for users to edit. Note: for backwards compatibility with DOCKER_OPTS=--selinux-enabled=false (to make that take precedent), we intentionally put the environment variable as the first option. However, for backwards compatibility with older units, we also retain the script. We are able to remove the graphdriver detection/selection since that behavior now happens appropriately in docker, but we need to keep the selinux defaulting so that people who are executing the script and expecting selinux to work (e.g. if they copied an old docker.service) will continue to get selinux as expected.