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package network
import (
"fmt"
"os"
"strings"
"text/tabwriter"
"text/template"
"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/pkg/domain/entities"
"github.com/containers/podman/v3/pkg/network"
"github.com/pkg/errors"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
)
var (
networklistDescription = `List networks`
networklistCommand = &cobra.Command{
Use: "ls [options]",
Args: validate.NoArgs,
Short: "network list",
Long: networklistDescription,
RunE: networkList,
ValidArgsFunction: completion.AutocompleteNone,
Example: `podman network list`,
}
)
var (
networkListOptions entities.NetworkListOptions
filters []string
noTrunc bool
)
func networkListFlags(flags *pflag.FlagSet) {
formatFlagName := "format"
flags.StringVar(&networkListOptions.Format, formatFlagName, "", "Pretty-print networks to JSON or using a Go template")
_ = networklistCommand.RegisterFlagCompletionFunc(formatFlagName, common.AutocompleteJSONFormat)
flags.BoolVarP(&networkListOptions.Quiet, "quiet", "q", false, "display only names")
flags.BoolVar(&noTrunc, "no-trunc", false, "Do not truncate the network ID")
filterFlagName := "filter"
flags.StringArrayVarP(&filters, filterFlagName, "f", nil, "Provide filter values (e.g. 'name=podman')")
flags.Bool("noheading", false, "Do not print headers")
_ = networklistCommand.RegisterFlagCompletionFunc(filterFlagName, common.AutocompleteNetworkFilters)
}
func init() {
registry.Commands = append(registry.Commands, registry.CliCommand{
Mode: []entities.EngineMode{entities.ABIMode, entities.TunnelMode},
Command: networklistCommand,
Parent: networkCmd,
})
flags := networklistCommand.Flags()
networkListFlags(flags)
}
func networkList(cmd *cobra.Command, args []string) error {
networkListOptions.Filters = make(map[string][]string)
for _, f := range filters {
split := strings.SplitN(f, "=", 2)
if len(split) == 1 {
return errors.Errorf("invalid filter %q", f)
}
networkListOptions.Filters[split[0]] = append(networkListOptions.Filters[split[0]], split[1])
}
responses, err := registry.ContainerEngine().NetworkList(registry.Context(), networkListOptions)
if err != nil {
return err
}
switch {
// quiet means we only print the network names
case networkListOptions.Quiet:
quietOut(responses)
// JSON output formatting
case report.IsJSON(networkListOptions.Format):
err = jsonOut(responses)
// table or other format output
default:
err = templateOut(responses, cmd)
}
return err
}
func quietOut(responses []*entities.NetworkListReport) {
for _, r := range responses {
fmt.Println(r.Name)
}
}
func jsonOut(responses []*entities.NetworkListReport) error {
prettyJSON, err := json.MarshalIndent(responses, "", " ")
if err != nil {
return err
}
fmt.Println(string(prettyJSON))
return nil
}
func templateOut(responses []*entities.NetworkListReport, cmd *cobra.Command) error {
nlprs := make([]ListPrintReports, 0, len(responses))
for _, r := range responses {
nlprs = append(nlprs, ListPrintReports{r})
}
// Headers() gets lost resolving the embedded field names so add them
headers := report.Headers(ListPrintReports{}, map[string]string{
"Name": "name",
"CNIVersion": "version",
"Version": "version",
"Plugins": "plugins",
"Labels": "labels",
"ID": "network id",
})
renderHeaders := report.HasTable(networkListOptions.Format)
var row, format string
if cmd.Flags().Changed("format") {
row = report.NormalizeFormat(networkListOptions.Format)
} else { // 'podman network ls' equivalent to 'podman network ls --format="table {{.ID}} {{.Name}} {{.Version}} {{.Plugins}}" '
renderHeaders = true
row = "{{.ID}}\t{{.Name}}\t{{.Version}}\t{{.Plugins}}\n"
}
format = report.EnforceRange(row)
tmpl, err := template.New("listNetworks").Parse(format)
if err != nil {
return err
}
w := tabwriter.NewWriter(os.Stdout, 8, 2, 2, ' ', 0)
defer w.Flush()
noHeading, _ := cmd.Flags().GetBool("noheading")
if !noHeading && renderHeaders {
if err := tmpl.Execute(w, headers); err != nil {
return err
}
}
return tmpl.Execute(w, nlprs)
}
// ListPrintReports returns the network list report
type ListPrintReports struct {
*entities.NetworkListReport
}
// Version returns the CNI version
func (n ListPrintReports) Version() string {
return n.CNIVersion
}
// Plugins returns the CNI Plugins
func (n ListPrintReports) Plugins() string {
return network.GetCNIPlugins(n.NetworkConfigList)
}
// Labels returns any labels added to a Network
func (n ListPrintReports) Labels() string {
list := make([]string, 0, len(n.NetworkListReport.Labels))
for k, v := range n.NetworkListReport.Labels {
list = append(list, k+"="+v)
}
return strings.Join(list, ",")
}
// ID returns the Podman Network ID
func (n ListPrintReports) ID() string {
length := 12
if noTrunc {
length = 64
}
return network.GetNetworkID(n.Name)[:length]
}
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