| // +build !windows |
| |
| /* |
| Copyright The containerd Authors. |
| |
| Licensed under the Apache License, Version 2.0 (the "License"); |
| you may not use this file except in compliance with the License. |
| You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| */ |
| |
| package mount |
| |
| import ( |
| "path/filepath" |
| "sort" |
| "strings" |
| |
| "github.com/pkg/errors" |
| ) |
| |
| // Lookup returns the mount info corresponds to the path. |
| func Lookup(dir string) (Info, error) { |
| dir = filepath.Clean(dir) |
| |
| mounts, err := Self() |
| if err != nil { |
| return Info{}, err |
| } |
| |
| // Sort descending order by Info.Mountpoint |
| sort.SliceStable(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 |
| // Note that device number is not checked here, because for overlayfs files |
| // may have different device number with the mountpoint. |
| if strings.HasPrefix(dir, m.Mountpoint) { |
| return m, nil |
| } |
| } |
| |
| return Info{}, errors.Errorf("failed to find the mount info for %q", dir) |
| } |