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|
package pods
import (
"context"
"fmt"
"io/ioutil"
"os"
"strings"
"github.com/containers/podman/v2/cmd/podman/common"
"github.com/containers/podman/v2/cmd/podman/parse"
"github.com/containers/podman/v2/cmd/podman/registry"
"github.com/containers/podman/v2/cmd/podman/validate"
"github.com/containers/podman/v2/pkg/domain/entities"
"github.com/containers/podman/v2/pkg/errorhandling"
"github.com/containers/podman/v2/pkg/specgen"
"github.com/containers/podman/v2/pkg/util"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
)
var (
podCreateDescription = `After creating the pod, the pod ID is printed to stdout.
You can then start it at any time with the podman pod start <pod_id> command. The pod will be created with the initial state 'created'.`
createCommand = &cobra.Command{
Use: "create",
Args: validate.NoArgs,
Short: "Create a new empty pod",
Long: podCreateDescription,
RunE: create,
}
)
var (
createOptions entities.PodCreateOptions
labels, labelFile []string
podIDFile string
replace bool
share string
)
func init() {
registry.Commands = append(registry.Commands, registry.CliCommand{
Mode: []entities.EngineMode{entities.ABIMode, entities.TunnelMode},
Command: createCommand,
Parent: podCmd,
})
flags := createCommand.Flags()
flags.SetInterspersed(false)
flags.AddFlagSet(common.GetNetFlags())
flags.StringVar(&createOptions.CGroupParent, "cgroup-parent", "", "Set parent cgroup for the pod")
flags.BoolVar(&createOptions.Infra, "infra", true, "Create an infra container associated with the pod to share namespaces with")
flags.StringVar(&createOptions.InfraConmonPidFile, "infra-conmon-pidfile", "", "Path to the file that will receive the POD of the infra container's conmon")
flags.String("infra-image", containerConfig.Engine.InfraImage, "The image of the infra container to associate with the pod")
flags.String("infra-command", containerConfig.Engine.InfraCommand, "The command to run on the infra container when the pod is started")
flags.StringSliceVar(&labelFile, "label-file", []string{}, "Read in a line delimited file of labels")
flags.StringSliceVarP(&labels, "label", "l", []string{}, "Set metadata on pod (default [])")
flags.StringVarP(&createOptions.Name, "name", "n", "", "Assign a name to the pod")
flags.StringVarP(&createOptions.Hostname, "hostname", "", "", "Set a hostname to the pod")
flags.StringVar(&podIDFile, "pod-id-file", "", "Write the pod ID to the file")
flags.BoolVar(&replace, "replace", false, "If a pod with the same exists, replace it")
flags.StringVar(&share, "share", specgen.DefaultKernelNamespaces, "A comma delimited list of kernel namespaces the pod will share")
flags.SetNormalizeFunc(aliasNetworkFlag)
}
func aliasNetworkFlag(_ *pflag.FlagSet, name string) pflag.NormalizedName {
if name == "net" {
name = "network"
}
return pflag.NormalizedName(name)
}
func create(cmd *cobra.Command, args []string) error {
var (
err error
podIDFD *os.File
)
createOptions.Labels, err = parse.GetAllLabels(labelFile, labels)
if err != nil {
return errors.Wrapf(err, "unable to process labels")
}
if !createOptions.Infra {
logrus.Debugf("Not creating an infra container")
if cmd.Flag("infra-conmon-pidfile").Changed {
return errors.New("cannot set infra-conmon-pid without an infra container")
}
if cmd.Flag("infra-command").Changed {
return errors.New("cannot set infra-command without an infra container")
}
if cmd.Flag("infra-image").Changed {
return errors.New("cannot set infra-image without an infra container")
}
createOptions.InfraImage = ""
if cmd.Flag("share").Changed && share != "none" && share != "" {
return fmt.Errorf("cannot set share(%s) namespaces without an infra container", cmd.Flag("share").Value)
}
createOptions.Share = nil
} else {
createOptions.Share = strings.Split(share, ",")
if cmd.Flag("infra-command").Changed {
// Only send content to server side if user changed defaults
createOptions.InfraCommand, err = cmd.Flags().GetString("infra-command")
if err != nil {
return err
}
}
if cmd.Flag("infra-image").Changed {
// Only send content to server side if user changed defaults
createOptions.InfraImage, err = cmd.Flags().GetString("infra-image")
if err != nil {
return err
}
}
}
if cmd.Flag("pod-id-file").Changed {
podIDFD, err = util.OpenExclusiveFile(podIDFile)
if err != nil && os.IsExist(err) {
return errors.Errorf("pod id file exists. Ensure another pod is not using it or delete %s", podIDFile)
}
if err != nil {
return errors.Errorf("error opening pod-id-file %s", podIDFile)
}
defer errorhandling.CloseQuiet(podIDFD)
defer errorhandling.SyncQuiet(podIDFD)
}
createOptions.Net, err = common.NetFlagsToNetOptions(cmd)
if err != nil {
return err
}
createOptions.Net.Network = specgen.Namespace{}
if cmd.Flag("network").Changed {
netInput, err := cmd.Flags().GetString("network")
if err != nil {
return err
}
n := specgen.Namespace{}
switch netInput {
case "bridge":
n.NSMode = specgen.Bridge
case "host":
n.NSMode = specgen.Host
case "slirp4netns":
n.NSMode = specgen.Slirp
default:
// Container and NS mode are presently unsupported
n.NSMode = specgen.Bridge
createOptions.Net.CNINetworks = strings.Split(netInput, ",")
}
createOptions.Net.Network = n
}
if len(createOptions.Net.PublishPorts) > 0 {
if !createOptions.Infra {
return errors.Errorf("you must have an infra container to publish port bindings to the host")
}
}
createOptions.CreateCommand = os.Args
if replace {
if err := replacePod(createOptions.Name); err != nil {
return err
}
}
response, err := registry.ContainerEngine().PodCreate(context.Background(), createOptions)
if err != nil {
return err
}
if len(podIDFile) > 0 {
if err = ioutil.WriteFile(podIDFile, []byte(response.Id), 0644); err != nil {
return errors.Wrapf(err, "failed to write pod ID to file %q", podIDFile)
}
}
fmt.Println(response.Id)
return nil
}
func replacePod(name string) error {
if len(name) == 0 {
return errors.New("cannot replace pod without --name being set")
}
rmOptions := entities.PodRmOptions{
Force: true, // stop and remove pod
Ignore: true, // ignore if pod doesn't exist
}
return removePods([]string{name}, rmOptions, false)
}
|
