github.com/alibaba/sealer@v0.8.6-0.20220430115802-37a2bdaa8173/pkg/prune/layer_pruner.go (about)

     1  // Copyright © 2022 Alibaba Group Holding Ltd.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package prune
    16  
    17  import (
    18  	"path/filepath"
    19  
    20  	"github.com/alibaba/sealer/common"
    21  	"github.com/alibaba/sealer/pkg/image/store"
    22  	"github.com/alibaba/sealer/utils"
    23  )
    24  
    25  type layerPrune struct {
    26  	layerDataDir string
    27  	layerDBDir   string
    28  	imageStore   store.ImageStore
    29  }
    30  
    31  func NewLayerPrune() (Pruner, error) {
    32  	imageStore, err := store.NewDefaultImageStore()
    33  	if err != nil {
    34  		return nil, err
    35  	}
    36  
    37  	return layerPrune{imageStore: imageStore,
    38  		layerDataDir: common.DefaultLayerDir,
    39  		layerDBDir:   filepath.Join(common.DefaultLayerDBRoot, "sha256"),
    40  	}, nil
    41  }
    42  
    43  func (l layerPrune) Select() ([]string, error) {
    44  	var (
    45  		pruneList = make([]string, 0)
    46  		//save a path with desired name as value.
    47  		pruneMap = make(map[string][]string)
    48  	)
    49  
    50  	allLayerIDList, err := l.getAllLayers()
    51  	if err != nil {
    52  		return pruneList, err
    53  	}
    54  
    55  	pruneMap[l.layerDataDir] = allLayerIDList
    56  	pruneMap[l.layerDBDir] = allLayerIDList
    57  
    58  	for root, desired := range pruneMap {
    59  		subsets, err := utils.GetDirNameListInDir(root, utils.FilterOptions{
    60  			All:          true,
    61  			WithFullPath: true,
    62  		})
    63  		if err != nil {
    64  			return pruneList, err
    65  		}
    66  		for _, subset := range subsets {
    67  			if utils.NotIn(filepath.Base(subset), desired) {
    68  				pruneList = append(pruneList, subset)
    69  			}
    70  		}
    71  	}
    72  
    73  	return pruneList, nil
    74  }
    75  
    76  // getAllLayers return current image id and layers
    77  func (l layerPrune) getAllLayers() ([]string, error) {
    78  	imageMetadataMap, err := l.imageStore.GetImageMetadataMap()
    79  	var allImageLayerDirs []string
    80  
    81  	if err != nil {
    82  		return nil, err
    83  	}
    84  
    85  	for _, imageMetadata := range imageMetadataMap {
    86  		for _, m := range imageMetadata.Manifests {
    87  			image, err := l.imageStore.GetByID(m.ID)
    88  			if err != nil {
    89  				return nil, err
    90  			}
    91  			for _, layer := range image.Spec.Layers {
    92  				if layer.ID != "" {
    93  					allImageLayerDirs = append(allImageLayerDirs, layer.ID.Hex())
    94  				}
    95  			}
    96  		}
    97  	}
    98  	return utils.RemoveDuplicate(allImageLayerDirs), err
    99  }
   100  func (l layerPrune) GetSelectorMessage() string {
   101  	return LayerPruner
   102  }