github.com/kim0/docker@v0.6.2-0.20161130212042-4addda3f07e7/cli/command/system/prune.go (about)

     1  package system
     2  
     3  import (
     4  	"fmt"
     5  
     6  	"github.com/docker/docker/cli"
     7  	"github.com/docker/docker/cli/command"
     8  	"github.com/docker/docker/cli/command/prune"
     9  	units "github.com/docker/go-units"
    10  	"github.com/spf13/cobra"
    11  )
    12  
    13  type pruneOptions struct {
    14  	force bool
    15  	all   bool
    16  }
    17  
    18  // NewPruneCommand creates a new cobra.Command for `docker prune`
    19  func NewPruneCommand(dockerCli *command.DockerCli) *cobra.Command {
    20  	var opts pruneOptions
    21  
    22  	cmd := &cobra.Command{
    23  		Use:   "prune [OPTIONS]",
    24  		Short: "Remove unused data",
    25  		Args:  cli.NoArgs,
    26  		RunE: func(cmd *cobra.Command, args []string) error {
    27  			return runPrune(dockerCli, opts)
    28  		},
    29  	}
    30  
    31  	flags := cmd.Flags()
    32  	flags.BoolVarP(&opts.force, "force", "f", false, "Do not prompt for confirmation")
    33  	flags.BoolVarP(&opts.all, "all", "a", false, "Remove all unused images not just dangling ones")
    34  
    35  	return cmd
    36  }
    37  
    38  const (
    39  	warning = `WARNING! This will remove:
    40  	- all stopped containers
    41  	- all volumes not used by at least one container
    42  	- all networks not used by at least one container
    43  	%s
    44  Are you sure you want to continue?`
    45  
    46  	danglingImageDesc = "- all dangling images"
    47  	allImageDesc      = `- all images without at least one container associated to them`
    48  )
    49  
    50  func runPrune(dockerCli *command.DockerCli, opts pruneOptions) error {
    51  	var message string
    52  
    53  	if opts.all {
    54  		message = fmt.Sprintf(warning, allImageDesc)
    55  	} else {
    56  		message = fmt.Sprintf(warning, danglingImageDesc)
    57  	}
    58  
    59  	if !opts.force && !command.PromptForConfirmation(dockerCli.In(), dockerCli.Out(), message) {
    60  		return nil
    61  	}
    62  
    63  	var spaceReclaimed uint64
    64  
    65  	for _, pruneFn := range []func(dockerCli *command.DockerCli) (uint64, string, error){
    66  		prune.RunContainerPrune,
    67  		prune.RunVolumePrune,
    68  		prune.RunNetworkPrune,
    69  	} {
    70  		spc, output, err := pruneFn(dockerCli)
    71  		if err != nil {
    72  			return err
    73  		}
    74  		spaceReclaimed += spc
    75  		if output != "" {
    76  			fmt.Fprintln(dockerCli.Out(), output)
    77  		}
    78  	}
    79  
    80  	spc, output, err := prune.RunImagePrune(dockerCli, opts.all)
    81  	if err != nil {
    82  		return err
    83  	}
    84  	if spc > 0 {
    85  		spaceReclaimed += spc
    86  		fmt.Fprintln(dockerCli.Out(), output)
    87  	}
    88  
    89  	fmt.Fprintln(dockerCli.Out(), "Total reclaimed space:", units.HumanSize(float64(spaceReclaimed)))
    90  
    91  	return nil
    92  }