tune2fs not found in dind container starting 1.9.1

[dubglan]

Looks like docker:1.9.1-dind and higher can not use devicemapper because tune2fs is not found.

docker run --privileged=true --rm -ti docker:1.9.1-dind -s devicemapper
Unable to find image 'docker:1.9.1-dind' locally
1.9.1-dind: Pulling from library/docker
4d06f2521e4f: Already exists
99e9f5d463c9: Already exists
a3ed95caeb02: Pull complete
9798e0e4a42a: Pull complete
0e452ef5783c: Pull complete
3a53fe711605: Pull complete
2bf575fb4306: Pull complete
3d883526b97b: Pull complete
Digest: sha256:9d7abad1778df8c3cdfdbf581b922003abeaf74f8da44d115fd8f6dfcb51b2a1
Status: Downloaded newer image for docker:1.9.1-dind
WARN[0000] /!\ DON'T BIND ON ANY IP ADDRESS WITHOUT setting -tlsverify IF YOU DON'T KNOW WHAT YOU'RE DOING /!\
WARN[0000] Udev sync is not supported. This will lead to unexpected behavior, data loss and errors. For more information, see https://docs.docker.com/reference/commandline/daemon/#daemon-storage-driver-option
INFO[0000] API listen on /var/run/docker.sock
INFO[0000] API listen on [::]:2375
WARN[0000] Usage of loopback devices is strongly discouraged for production use. Please use `--storage-opt dm.thinpooldev` or use `man docker` to refer to dm.thinpooldev section.
WARN[0000] XFS is not supported in your system. Either the kernel doesnt support it or mkfs.xfs is not in your PATH. Defaulting to ext4 filesystem
FATA[0024] Error starting daemon: error initializing graphdriver: exec: "tune2fs": executable file not found in $PATH

[dubglan]

@tianon Looks like you are the maintainer of the repo, could you please take a look.

[tianon]

Arg, good catch! I think upstream actually prefers XFS now, but we probably ought to include both tools since it's configurable.

[tianon]

Heh:

ERRO[0001] devmapper: Udev sync is not supported. This will lead to data loss and unexpected behavior. Install a dynamic binary to use devicemapper or select a different storage driver. For more information, see https://docs.docker.com/engine/reference/commandline/daemon/#daemon-storage-driver-option 
FATA[0001] Error starting daemon: error initializing graphdriver: driver not supported 

[tianon]

With both --storage-driver devicemapper AND --storage-opt dm.override_udev_sync_check=true, I now have success:

INFO[0004] Docker daemon                                 commit=388f544 graphdriver=devicemapper version=1.11.0-rc2

Will be sending a PR sometime today. 👍