package system import ( "bytes" "fmt" "text/template" "github.com/docker/cli/cli" "github.com/docker/cli/cli/command" "github.com/docker/cli/cli/command/container" "github.com/docker/cli/cli/command/image" "github.com/docker/cli/cli/command/network" "github.com/docker/cli/cli/command/volume" "github.com/docker/cli/opts" "github.com/docker/docker/api/types/versions" units "github.com/docker/go-units" "github.com/spf13/cobra" "golang.org/x/net/context" ) type pruneOptions struct { force bool all bool pruneBuildCache bool pruneVolumes bool filter opts.FilterOpt } // newPruneCommand creates a new cobra.Command for `docker prune` func newPruneCommand(dockerCli command.Cli) *cobra.Command { options := pruneOptions{filter: opts.NewFilterOpt(), pruneBuildCache: true} cmd := &cobra.Command{ Use: "prune [OPTIONS]", Short: "Remove unused data", Args: cli.NoArgs, RunE: func(cmd *cobra.Command, args []string) error { return runPrune(dockerCli, options) }, Tags: map[string]string{"version": "1.25"}, } flags := cmd.Flags() flags.BoolVarP(&options.force, "force", "f", false, "Do not prompt for confirmation") flags.BoolVarP(&options.all, "all", "a", false, "Remove all unused images not just dangling ones") flags.BoolVar(&options.pruneVolumes, "volumes", false, "Prune volumes") flags.Var(&options.filter, "filter", "Provide filter values (e.g. 'label==')") // "filter" flag is available in 1.28 (docker 17.04) and up flags.SetAnnotation("filter", "version", []string{"1.28"}) return cmd } const confirmationTemplate = `WARNING! This will remove: {{- range $_, $warning := . }} - {{ $warning }} {{- end }} Are you sure you want to continue?` // runBuildCachePrune executes a prune command for build cache func runBuildCachePrune(dockerCli command.Cli, _ opts.FilterOpt) (uint64, string, error) { report, err := dockerCli.Client().BuildCachePrune(context.Background()) if err != nil { return 0, "", err } return report.SpaceReclaimed, "", nil } func runPrune(dockerCli command.Cli, options pruneOptions) error { // TODO version this once "until" filter is supported for volumes if options.pruneVolumes && options.filter.Value().Include("until") { return fmt.Errorf(`ERROR: The "until" filter is not supported with "--volumes"`) } if versions.LessThan(dockerCli.Client().ClientVersion(), "1.31") { options.pruneBuildCache = false } if !options.force && !command.PromptForConfirmation(dockerCli.In(), dockerCli.Out(), confirmationMessage(options)) { return nil } imagePrune := func(dockerCli command.Cli, filter opts.FilterOpt) (uint64, string, error) { return image.RunPrune(dockerCli, options.all, options.filter) } pruneFuncs := []func(dockerCli command.Cli, filter opts.FilterOpt) (uint64, string, error){ container.RunPrune, network.RunPrune, } if options.pruneVolumes { pruneFuncs = append(pruneFuncs, volume.RunPrune) } pruneFuncs = append(pruneFuncs, imagePrune) if options.pruneBuildCache { pruneFuncs = append(pruneFuncs, runBuildCachePrune) } var spaceReclaimed uint64 for _, pruneFn := range pruneFuncs { spc, output, err := pruneFn(dockerCli, options.filter) if err != nil { return err } spaceReclaimed += spc if output != "" { fmt.Fprintln(dockerCli.Out(), output) } } fmt.Fprintln(dockerCli.Out(), "Total reclaimed space:", units.HumanSize(float64(spaceReclaimed))) return nil } // confirmationMessage constructs a confirmation message that depends on the cli options. func confirmationMessage(options pruneOptions) string { t := template.Must(template.New("confirmation message").Parse(confirmationTemplate)) warnings := []string{ "all stopped containers", "all networks not used by at least one container", } if options.pruneVolumes { warnings = append(warnings, "all volumes not used by at least one container") } if options.all { warnings = append(warnings, "all images without at least one container associated to them") } else { warnings = append(warnings, "all dangling images") } if options.pruneBuildCache { warnings = append(warnings, "all build cache") } var buffer bytes.Buffer t.Execute(&buffer, &warnings) return buffer.String() }