I implemented /dev/disk/by-uuid on my platform but using absolute links (where
udev typically uses relative) which broke the code in `os.DeviceUUID`.
Rather than just patch that up directly instead stat both the target and
candidate devices and pick one with matching major:minor in st_rdev. This saves
manually building paths to resolve symlinks and I think should be more robust
overall.
I also removed the initial stat of /dev/disk/by-uuid, I believe
`ioutil.Readdir` will correctly return an error if the path does not exist.
Signed-off-by: Ian Campbell <ijc@docker.com>
11714fb6a3