DockerCLI/command/image/prune.go

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package image
import (
"fmt"
"golang.org/x/net/context"
"github.com/docker/docker/api/types/filters"
"github.com/docker/docker/cli"
"github.com/docker/docker/cli/command"
units "github.com/docker/go-units"
"github.com/spf13/cobra"
)
type pruneOptions struct {
force bool
all bool
}
// NewPruneCommand returns a new cobra prune command for images
func NewPruneCommand(dockerCli *command.DockerCli) *cobra.Command {
var opts pruneOptions
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, opts)
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(&opts.force, "force", "f", false, "Do not prompt for confirmation")
flags.BoolVarP(&opts.all, "all", "a", false, "Remove all unused images, not just dangling ones")
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.DockerCli, opts pruneOptions) (spaceReclaimed uint64, output string, err error) {
pruneFilters := filters.NewArgs()
pruneFilters.Add("dangling", fmt.Sprintf("%v", !opts.all))
warning := danglingWarning
if opts.all {
warning = allImageWarning
}
if !opts.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.DockerCli, all bool) (uint64, string, error) {
return runPrune(dockerCli, pruneOptions{force: true, all: all})
}