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package volumes
import (
"context"
"fmt"
"os"
"strings"
"github.com/containers/common/pkg/completion"
"github.com/containers/common/pkg/report"
"github.com/containers/podman/v3/cmd/podman/common"
"github.com/containers/podman/v3/cmd/podman/registry"
"github.com/containers/podman/v3/cmd/podman/validate"
"github.com/containers/podman/v3/libpod/define"
"github.com/containers/podman/v3/pkg/domain/entities"
"github.com/pkg/errors"
"github.com/spf13/cobra"
)
var (
volumeLsDescription = `
podman volume ls
List all available volumes. The output of the volumes can be filtered
and the output format can be changed to JSON or a user specified Go template.`
lsCommand = &cobra.Command{
Use: "ls [options]",
Aliases: []string{"list"},
Args: validate.NoArgs,
Short: "List volumes",
Long: volumeLsDescription,
RunE: list,
ValidArgsFunction: completion.AutocompleteNone,
}
)
var (
// Temporary struct to hold cli values.
cliOpts = struct {
Filter []string
Format string
Quiet bool
}{}
lsOpts = entities.VolumeListOptions{}
)
func init() {
registry.Commands = append(registry.Commands, registry.CliCommand{
Command: lsCommand,
Parent: volumeCmd,
})
flags := lsCommand.Flags()
filterFlagName := "filter"
flags.StringSliceVarP(&cliOpts.Filter, filterFlagName, "f", []string{}, "Filter volume output")
_ = lsCommand.RegisterFlagCompletionFunc(filterFlagName, common.AutocompleteVolumeFilters)
formatFlagName := "format"
flags.StringVar(&cliOpts.Format, formatFlagName, "{{.Driver}}\t{{.Name}}\n", "Format volume output using Go template")
_ = lsCommand.RegisterFlagCompletionFunc(formatFlagName, common.AutocompleteFormat(define.InspectVolumeData{}))
flags.Bool("noheading", false, "Do not print headers")
flags.BoolVarP(&cliOpts.Quiet, "quiet", "q", false, "Print volume output in quiet mode")
}
func list(cmd *cobra.Command, args []string) error {
if cliOpts.Quiet && cmd.Flag("format").Changed {
return errors.New("quiet and format flags cannot be used together")
}
if len(cliOpts.Filter) > 0 {
lsOpts.Filter = make(map[string][]string)
}
for _, f := range cliOpts.Filter {
filterSplit := strings.SplitN(f, "=", 2)
if len(filterSplit) < 2 {
return errors.Errorf("filter input must be in the form of filter=value: %s is invalid", f)
}
lsOpts.Filter[filterSplit[0]] = append(lsOpts.Filter[filterSplit[0]], filterSplit[1])
}
responses, err := registry.ContainerEngine().VolumeList(context.Background(), lsOpts)
if err != nil {
return err
}
switch {
case report.IsJSON(cliOpts.Format):
return outputJSON(responses)
case len(responses) < 1:
return nil
}
return outputTemplate(cmd, responses)
}
func outputTemplate(cmd *cobra.Command, responses []*entities.VolumeListReport) error {
noHeading, _ := cmd.Flags().GetBool("noheading")
headers := report.Headers(entities.VolumeListReport{}, map[string]string{
"Name": "VOLUME NAME",
})
var row string
switch {
case cliOpts.Quiet:
row = "{{.Name}}\n"
case cmd.Flags().Changed("format"):
row = report.NormalizeFormat(cliOpts.Format)
default:
row = cmd.Flag("format").Value.String()
}
format := report.EnforceRange(row)
tmpl, err := report.NewTemplate("list").Parse(format)
if err != nil {
return err
}
w, err := report.NewWriterDefault(os.Stdout)
if err != nil {
return err
}
defer w.Flush()
if !(noHeading || cliOpts.Quiet || cmd.Flag("format").Changed) {
if err := tmpl.Execute(w, headers); err != nil {
return errors.Wrapf(err, "failed to write report column headers")
}
}
return tmpl.Execute(w, responses)
}
func outputJSON(vols []*entities.VolumeListReport) error {
b, err := json.MarshalIndent(vols, "", " ")
if err != nil {
return err
}
fmt.Println(string(b))
return nil
}
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