package image import ( "fmt" "golang.org/x/net/context" "github.com/docker/cli/cli" "github.com/docker/cli/cli/command" "github.com/docker/cli/opts" units "github.com/docker/go-units" "github.com/spf13/cobra" ) type pruneOptions struct { force bool all bool filter opts.FilterOpt } // NewPruneCommand returns a new cobra prune command for images func NewPruneCommand(dockerCli command.Cli) *cobra.Command { options := pruneOptions{filter: opts.NewFilterOpt()} cmd := &cobra.Command{ Use: "prune [OPTIONS]", Short: "Remove unused images", Args: cli.NoArgs, RunE: func(cmd *cobra.Command, args []string) error { spaceReclaimed, output, err := runPrune(dockerCli, options) if err != nil { return err } if output != "" { fmt.Fprintln(dockerCli.Out(), output) } fmt.Fprintln(dockerCli.Out(), "Total reclaimed space:", units.HumanSize(float64(spaceReclaimed))) return nil }, 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.Var(&options.filter, "filter", "Provide filter values (e.g. 'until=')") return cmd } const ( allImageWarning = `WARNING! This will remove all images without at least one container associated to them. Are you sure you want to continue?` danglingWarning = `WARNING! This will remove all dangling images. Are you sure you want to continue?` ) func runPrune(dockerCli command.Cli, options pruneOptions) (spaceReclaimed uint64, output string, err error) { pruneFilters := options.filter.Value() pruneFilters.Add("dangling", fmt.Sprintf("%v", !options.all)) pruneFilters = command.PruneFilters(dockerCli, pruneFilters) warning := danglingWarning if options.all { warning = allImageWarning } if !options.force && !command.PromptForConfirmation(dockerCli.In(), dockerCli.Out(), warning) { return } report, err := dockerCli.Client().ImagesPrune(context.Background(), pruneFilters) if err != nil { return } if len(report.ImagesDeleted) > 0 { output = "Deleted Images:\n" for _, st := range report.ImagesDeleted { if st.Untagged != "" { output += fmt.Sprintln("untagged:", st.Untagged) } else { output += fmt.Sprintln("deleted:", st.Deleted) } } spaceReclaimed = report.SpaceReclaimed } return } // RunPrune calls the Image Prune API // This returns the amount of space reclaimed and a detailed output string func RunPrune(dockerCli command.Cli, all bool, filter opts.FilterOpt) (uint64, string, error) { return runPrune(dockerCli, pruneOptions{force: true, all: all, filter: filter}) }