github.com/containerd/nerdctl/v2@v2.0.0-beta.5.0.20240520001846-b5758f54fa28/pkg/cmd/volume/rm.go (about) 1 /* 2 Copyright The containerd Authors. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 package volume 18 19 import ( 20 "context" 21 "encoding/json" 22 "fmt" 23 24 "github.com/containerd/containerd" 25 "github.com/containerd/nerdctl/v2/pkg/api/types" 26 "github.com/containerd/nerdctl/v2/pkg/inspecttypes/dockercompat" 27 "github.com/containerd/nerdctl/v2/pkg/labels" 28 "github.com/containerd/nerdctl/v2/pkg/mountutil" 29 ) 30 31 func Remove(ctx context.Context, client *containerd.Client, volumes []string, options types.VolumeRemoveOptions) error { 32 containers, err := client.Containers(ctx) 33 if err != nil { 34 return err 35 } 36 volStore, err := Store(options.GOptions.Namespace, options.GOptions.DataRoot, options.GOptions.Address) 37 if err != nil { 38 return err 39 } 40 usedVolumes, err := usedVolumes(ctx, containers) 41 if err != nil { 42 return err 43 } 44 45 var volumenames []string // nolint: prealloc 46 for _, name := range volumes { 47 volume, err := volStore.Get(name, false) 48 if err != nil { 49 return err 50 } 51 if _, ok := usedVolumes[volume.Name]; ok { 52 return fmt.Errorf("volume %q is in use", name) 53 } 54 volumenames = append(volumenames, name) 55 } 56 removedNames, err := volStore.Remove(volumenames) 57 if err != nil { 58 return err 59 } 60 for _, name := range removedNames { 61 fmt.Fprintln(options.Stdout, name) 62 } 63 return err 64 } 65 66 func usedVolumes(ctx context.Context, containers []containerd.Container) (map[string]struct{}, error) { 67 usedVolumes := make(map[string]struct{}) 68 for _, c := range containers { 69 l, err := c.Labels(ctx) 70 if err != nil { 71 return nil, err 72 } 73 mountsJSON, ok := l[labels.Mounts] 74 if !ok { 75 continue 76 } 77 78 var mounts []dockercompat.MountPoint 79 err = json.Unmarshal([]byte(mountsJSON), &mounts) 80 if err != nil { 81 return nil, err 82 } 83 for _, m := range mounts { 84 if m.Type == mountutil.Volume { 85 usedVolumes[m.Name] = struct{}{} 86 } 87 } 88 } 89 return usedVolumes, nil 90 }