"kernel does not support overlay fs" even though it does

[TomasTomecek]

Is this a BUG REPORT or FEATURE REQUEST?:

/kind bug

Description

podman fails to initialize telling me kernel does not support overlay fs: driver not supported. This is a standard Fedora 27 kernel. I presume this is related to the fact that I have XFS w/o dtype.

Steps to reproduce the issue:

1. podman --log-level debug images

Describe the results you received:

DEBU[0000] [graphdriver] trying provided driver "overlay"
DEBU[0000] overlay: override_kernelcheck=true
ERRO[0000] Could not get runtime: kernel does not support overlay fs: driver not supported

Describe the results you expected:

The list of images is presented.

Additional information you deem important (e.g. issue happens only occasionally):

Output of podman version:

Version:       0.3.4
Go Version:    go1.10
OS/Arch:       linux/amd64

Output of podman info:

could not get runtime: kernel does not support overlay fs: driver not supported

Additional environment details (AWS, VirtualBox, physical, etc.):

Fedora rawhide

[TomasTomecek]

Now I'm even more sure it's because of dtype b/c I created a new xfs partition with dtype and it works just fine. Therefore, would it be possible to

1. make the error message more precise?
2. and ideally suggest the user what it should do (reformat disk, use different backend)?

WDYT?

[mheon]

I think we've seen this before - containers/storage was dropping specific error causes for certain things and instead giving a nonspecific driver not supported error. This was fixed in containers/storage#163, but we haven't updated to pick up that fix. Let me open a PR to grab the latest version of c/storage and fix this, so we can have it resolved in the next release.

[rhatdan]

Since this is merged, I am going to close this Issue.