github.com/flavio/docker@v0.1.3-0.20170117145210-f63d1a6eec47/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/cli"
     9  	"github.com/docker/docker/cli/command"
    10  	"github.com/docker/docker/opts"
    11  	"github.com/spf13/cobra"
    12  )
    13  
    14  type pruneOptions struct {
    15  	force  bool
    16  	filter opts.FilterOpt
    17  }
    18  
    19  // NewPruneCommand returns a new cobra prune command for networks
    20  func NewPruneCommand(dockerCli *command.DockerCli) *cobra.Command {
    21  	opts := pruneOptions{filter: opts.NewFilterOpt()}
    22  
    23  	cmd := &cobra.Command{
    24  		Use:   "prune [OPTIONS]",
    25  		Short: "Remove all unused networks",
    26  		Args:  cli.NoArgs,
    27  		RunE: func(cmd *cobra.Command, args []string) error {
    28  			output, err := runPrune(dockerCli, opts)
    29  			if err != nil {
    30  				return err
    31  			}
    32  			if output != "" {
    33  				fmt.Fprintln(dockerCli.Out(), output)
    34  			}
    35  			return nil
    36  		},
    37  		Tags: map[string]string{"version": "1.25"},
    38  	}
    39  
    40  	flags := cmd.Flags()
    41  	flags.BoolVarP(&opts.force, "force", "f", false, "Do not prompt for confirmation")
    42  	flags.Var(&opts.filter, "filter", "Provide filter values (e.g. 'until=<timestamp>')")
    43  
    44  	return cmd
    45  }
    46  
    47  const warning = `WARNING! This will remove all networks not used by at least one container.
    48  Are you sure you want to continue?`
    49  
    50  func runPrune(dockerCli *command.DockerCli, opts pruneOptions) (output string, err error) {
    51  	pruneFilters := opts.filter.Value()
    52  
    53  	if !opts.force && !command.PromptForConfirmation(dockerCli.In(), dockerCli.Out(), warning) {
    54  		return
    55  	}
    56  
    57  	report, err := dockerCli.Client().NetworksPrune(context.Background(), pruneFilters)
    58  	if err != nil {
    59  		return
    60  	}
    61  
    62  	if len(report.NetworksDeleted) > 0 {
    63  		output = "Deleted Networks:\n"
    64  		for _, id := range report.NetworksDeleted {
    65  			output += id + "\n"
    66  		}
    67  	}
    68  
    69  	return
    70  }
    71  
    72  // RunPrune calls the Network Prune API
    73  // This returns the amount of space reclaimed and a detailed output string
    74  func RunPrune(dockerCli *command.DockerCli, filter opts.FilterOpt) (uint64, string, error) {
    75  	output, err := runPrune(dockerCli, pruneOptions{force: true, filter: filter})
    76  	return 0, output, err
    77  }