Function bindToOverlay

core/unpack/unpacker.go:767–784

TODO: this is a temporary workaround until #13053 lands.

(mounts []mount.Mount)

// TODO: this is a temporary workaround until #13053 lands.
func bindToOverlay(mounts []mount.Mount) []mount.Mount {
	if len(mounts) != 1 || mounts[0].Type != "bind" {
		return mounts
	}

	m := mount.Mount{
		Type:   "overlay",
		Source: "overlay",
	}
	for _, o := range mounts[0].Options {
		if o != "rbind" {
			m.Options = append(m.Options, o)
		}
	}
	m.Options = append(m.Options, "upperdir="+mounts[0].Source)

	return []mount.Mount{m}
}