`filepath.Abs` does more than just `filepath.IsAbs` - namely, `filepath.Clean`, which resolves things like `.../.` or `.../../...`, and causes even an absolute path like `/some/path/../absolute` to fail (or, in my case, `/path/to/docker/.`)
Just using `filepath.IsAbs` directly is a much cheaper check, too. :)
Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
Upstream-commit: 603088be928564be2d863a897fbc1729adc74814
Component: engine
af8f9d4096