moby/daemon/archive_unix.go

// +build !windows

package daemon

// checkIfPathIsInAVolume checks if the path is in a volume. If it is, it
// cannot be in a read-only volume. If it  is not in a volume, the container
// cannot be configured with a read-only rootfs.
func checkIfPathIsInAVolume(container *Container, absPath string) (bool, error) {
	var toVolume bool
	for _, mnt := range container.MountPoints {
		if toVolume = mnt.HasResource(absPath); toVolume {
			if mnt.RW {
				break
			}
			return false, ErrVolumeReadonly
		}
	}
	return toVolume, nil
}