| // +build !windows |
| |
| package mount |
| |
| import ( |
| "fmt" |
| "path/filepath" |
| "sort" |
| "strings" |
| "syscall" |
| |
| "github.com/pkg/errors" |
| ) |
| |
| // Lookup returns the mount info corresponds to the path. |
| func Lookup(dir string) (Info, error) { |
| var dirStat syscall.Stat_t |
| dir = filepath.Clean(dir) |
| if err := syscall.Stat(dir, &dirStat); err != nil { |
| return Info{}, errors.Wrapf(err, "failed to access %q", dir) |
| } |
| |
| mounts, err := Self() |
| if err != nil { |
| return Info{}, err |
| } |
| |
| // Sort descending order by Info.Mountpoint |
| sort.Slice(mounts, func(i, j int) bool { |
| return mounts[j].Mountpoint < mounts[i].Mountpoint |
| }) |
| for _, m := range mounts { |
| // Note that m.{Major, Minor} are generally unreliable for our purpose here |
| // https://www.spinics.net/lists/linux-btrfs/msg58908.html |
| var st syscall.Stat_t |
| if err := syscall.Stat(m.Mountpoint, &st); err != nil { |
| // may fail; ignore err |
| continue |
| } |
| if st.Dev == dirStat.Dev && strings.HasPrefix(dir, m.Mountpoint) { |
| return m, nil |
| } |
| } |
| |
| return Info{}, fmt.Errorf("failed to find the mount info for %q", dir) |
| } |