func SearchMountPoints()

in mount/mount_linux.go [510:551]
32 lines of code
13 McCabe index (conditional complexity)

func SearchMountPoints(hostSource, mountInfoPath string) ([]string, error) {
	mis, err := ParseMountInfo(mountInfoPath)
	if err != nil {
		return nil, err
	}

	mountID := 0
	rootPath := ""
	major := -1
	minor := -1

	// Finding the underlying root path and major:minor if possible.
	// We need search in backward order because it's possible for later mounts
	// to overlap earlier mounts.
	for i := len(mis) - 1; i >= 0; i-- {
		if hostSource == mis[i].MountPoint || PathWithinBase(hostSource, mis[i].MountPoint) {
			// If it's a mount point or path under a mount point.
			mountID = mis[i].ID
			rootPath = filepath.Join(mis[i].Root, strings.TrimPrefix(hostSource, mis[i].MountPoint))
			major = mis[i].Major
			minor = mis[i].Minor
			break
		}
	}

	if rootPath == "" || major == -1 || minor == -1 {
		return nil, fmt.Errorf("failed to get root path and major:minor for %s", hostSource)
	}

	var refs []string
	for i := range mis {
		if mis[i].ID == mountID {
			// Ignore mount entry for mount source itself.
			continue
		}
		if mis[i].Root == rootPath && mis[i].Major == major && mis[i].Minor == minor {
			refs = append(refs, mis[i].MountPoint)
		}
	}

	return refs, nil
}