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

     1  package network
     2  
     3  import (
     4  	"fmt"
     5  
     6  	"golang.org/x/net/context"
     7  
     8  	"github.com/docker/docker/api/types"
     9  	"github.com/docker/docker/cli"
    10  	"github.com/docker/docker/cli/command"
    11  	"github.com/spf13/cobra"
    12  )
    13  
    14  type pruneOptions struct {
    15  	force bool
    16  }
    17  
    18  // NewPruneCommand returns a new cobra prune command for networks
    19  func NewPruneCommand(dockerCli *command.DockerCli) *cobra.Command {
    20  	var opts pruneOptions
    21  
    22  	cmd := &cobra.Command{
    23  		Use:   "prune [OPTIONS]",
    24  		Short: "Remove all unused networks",
    25  		Args:  cli.NoArgs,
    26  		RunE: func(cmd *cobra.Command, args []string) error {
    27  			output, err := runPrune(dockerCli, opts)
    28  			if err != nil {
    29  				return err
    30  			}
    31  			if output != "" {
    32  				fmt.Fprintln(dockerCli.Out(), output)
    33  			}
    34  			return nil
    35  		},
    36  	}
    37  
    38  	flags := cmd.Flags()
    39  	flags.BoolVarP(&opts.force, "force", "f", false, "Do not prompt for confirmation")
    40  
    41  	return cmd
    42  }
    43  
    44  const warning = `WARNING! This will remove all networks not used by at least one container.
    45  Are you sure you want to continue?`
    46  
    47  func runPrune(dockerCli *command.DockerCli, opts pruneOptions) (output string, err error) {
    48  	if !opts.force && !command.PromptForConfirmation(dockerCli.In(), dockerCli.Out(), warning) {
    49  		return
    50  	}
    51  
    52  	report, err := dockerCli.Client().NetworksPrune(context.Background(), types.NetworksPruneConfig{})
    53  	if err != nil {
    54  		return
    55  	}
    56  
    57  	if len(report.NetworksDeleted) > 0 {
    58  		output = "Deleted Networks:\n"
    59  		for _, id := range report.NetworksDeleted {
    60  			output += id + "\n"
    61  		}
    62  	}
    63  
    64  	return
    65  }
    66  
    67  // RunPrune calls the Network Prune API
    68  // This returns the amount of space reclaimed and a detailed output string
    69  func RunPrune(dockerCli *command.DockerCli) (uint64, string, error) {
    70  	output, err := runPrune(dockerCli, pruneOptions{force: true})
    71  	return 0, output, err
    72  }