github.com/alibaba/sealer@v0.8.6-0.20220430115802-37a2bdaa8173/sealer/cmd/save.go (about)

     1  // Copyright © 2021 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 cmd
    16  
    17  import (
    18  	"fmt"
    19  	"os"
    20  	"path/filepath"
    21  
    22  	v1 "github.com/alibaba/sealer/types/api/v1"
    23  	"github.com/alibaba/sealer/utils/platform"
    24  
    25  	"github.com/alibaba/sealer/pkg/image/reference"
    26  	"github.com/spf13/cobra"
    27  
    28  	"github.com/alibaba/sealer/logger"
    29  	"github.com/alibaba/sealer/pkg/image"
    30  )
    31  
    32  type saveFlag struct {
    33  	ImageTar string
    34  	Platform string
    35  }
    36  
    37  var save saveFlag
    38  
    39  // saveCmd represents the save command
    40  var saveCmd = &cobra.Command{
    41  	Use:   "save",
    42  	Short: "save image to a tar file",
    43  	Long:  `sealer save -o [output file name] [image name]`,
    44  	Example: `
    45  save kubernetes:v1.19.8 image to kubernetes.tar file:
    46  
    47  sealer save -o kubernetes.tar kubernetes:v1.19.8`,
    48  	Args: cobra.ExactArgs(1),
    49  	RunE: func(cmd *cobra.Command, args []string) error {
    50  		imageTar := save.ImageTar
    51  		if imageTar == "" {
    52  			return fmt.Errorf("imagetar cannot be empty")
    53  		}
    54  
    55  		dir, file := filepath.Split(imageTar)
    56  		if dir == "" {
    57  			dir = "."
    58  		}
    59  		if file == "" {
    60  			file = fmt.Sprintf("%s.tar", args[0])
    61  		}
    62  		imageTar = filepath.Join(dir, file)
    63  		// only file path like "/tmp" will lose add image tar name,make sure imageTar with full file name.
    64  		if filepath.Ext(imageTar) != ".tar" {
    65  			imageTar = filepath.Join(imageTar, fmt.Sprintf("%s.tar", args[0]))
    66  		}
    67  
    68  		ifs, err := image.NewImageFileService()
    69  		if err != nil {
    70  			return err
    71  		}
    72  		named, err := reference.ParseToNamed(args[0])
    73  		if err != nil {
    74  			return err
    75  		}
    76  
    77  		var targetPlatforms []*v1.Platform
    78  		if save.Platform != "" {
    79  			tp, err := platform.ParsePlatforms(save.Platform)
    80  			if err != nil {
    81  				return err
    82  			}
    83  			targetPlatforms = tp
    84  		}
    85  
    86  		if err = ifs.Save(named.Raw(), imageTar, targetPlatforms); err != nil {
    87  			return fmt.Errorf("failed to save image %s: %v", args[0], err)
    88  		}
    89  		logger.Info("save image %s to %s successfully", args[0], imageTar)
    90  		return nil
    91  	},
    92  }
    93  
    94  func init() {
    95  	rootCmd.AddCommand(saveCmd)
    96  	save = saveFlag{}
    97  	saveCmd.Flags().StringVarP(&save.ImageTar, "output", "o", "", "write the image to a file")
    98  	saveCmd.Flags().StringVar(&save.Platform, "platform", "", "set cloud image platform")
    99  
   100  	if err := saveCmd.MarkFlagRequired("output"); err != nil {
   101  		logger.Error("failed to init flag: %v", err)
   102  		os.Exit(1)
   103  	}
   104  }