[Docker 19.03.7] - overlay/overlay2 shows Backing Filesystem as <unknown> #40626
Description
Description
We are manually building docker / moby runtime in a project and after updating to 19.03.7 we remarked that the Backing Filesystem for overlay2 is now shown as "<unknown>" while it was "extfs" in 19.03.6.
Steps to reproduce the issue:
- Install docker 19.03.7
- Execute "docker info"
Describe the results you received:
Server:
Server Version: 19.03.7
Storage Driver: overlay2
Backing Filesystem: <unknown>
Supports d_type: true
Native Overlay Diff: true
Describe the results you expected:
Server:
Server Version: 19.03.7
Storage Driver: overlay2
Backing Filesystem: extfs
Supports d_type: true
Native Overlay Diff: true
Additional information:
This seems have been introduced with commit 5b6f2e1 which removes the filesystem check and now ommits setting backingFs variable, making it default to "<unknown>"
I am not a Go programmer, but probably something like the following can be readded in overlay.go in both overlay drivers:
fsMagic, err := graphdriver.GetFSMagic(testdir)
if err == nil {
if fsName, ok := graphdriver.FsNames[
64F0
fsMagic]; ok {
backingFs = fsName
}
}