func IsNotMountPoint()

in mount/mount.go [218:255]

• 28 lines of code
• 9 McCabe index (conditional complexity)

func IsNotMountPoint(mounter Interface, file string) (bool, error) {
	// IsLikelyNotMountPoint provides a quick check
	// to determine whether file IS A mountpoint.
	notMnt, notMntErr := mounter.IsLikelyNotMountPoint(file)
	if notMntErr != nil && os.IsPermission(notMntErr) {
		// We were not allowed to do the simple stat() check, e.g. on NFS with
		// root_squash. Fall back to /proc/mounts check below.
		notMnt = true
		notMntErr = nil
	}
	if notMntErr != nil {
		return notMnt, notMntErr
	}
	// identified as mountpoint, so return this fact.
	if notMnt == false {
		return notMnt, nil
	}

	// Resolve any symlinks in file, kernel would do the same and use the resolved path in /proc/mounts.
	resolvedFile, err := filepath.EvalSymlinks(file)
	if err != nil {
		return true, err
	}

	// check all mountpoints since IsLikelyNotMountPoint
	// is not reliable for some mountpoint types.
	mountPoints, mountPointsErr := mounter.List()
	if mountPointsErr != nil {
		return notMnt, mountPointsErr
	}
	for _, mp := range mountPoints {
		if isMountPointMatch(mp, resolvedFile) {
			notMnt = false
			break
		}
	}
	return notMnt, nil
}