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package main
import (
"reflect"
"strings"
"github.com/pkg/errors"
"github.com/projectatomic/libpod/cmd/podman/batchcontainer"
"github.com/projectatomic/libpod/cmd/podman/formats"
"github.com/projectatomic/libpod/cmd/podman/libpodruntime"
"github.com/projectatomic/libpod/libpod"
"github.com/urfave/cli"
)
var (
opts batchcontainer.PsOptions
)
type podPsOptions struct {
NoTrunc bool
Format string
Quiet bool
NumberOfContainers bool
}
type podPsTemplateParams struct {
ID string
Name string
NumberOfContainers int
}
// podPsJSONParams is used as a base structure for the psParams
// If template output is requested, podPsJSONParams will be converted to
// podPsTemplateParams.
// podPsJSONParams will be populated by data from libpod.Container,
// the members of the struct are the sama data types as their sources.
type podPsJSONParams struct {
ID string `json:"id"`
Name string `json:"name"`
NumberOfContainers int `json:"numberofcontainers"`
}
var (
podPsFlags = []cli.Flag{
cli.BoolFlag{
Name: "no-trunc",
Usage: "Display the extended information",
},
cli.BoolFlag{
Name: "quiet, q",
Usage: "Print the numeric IDs of the pods only",
},
}
podPsDescription = "Prints out information about pods"
podPsCommand = cli.Command{
Name: "ps",
Aliases: []string{"ls", "list"},
Usage: "List pods",
Description: podPsDescription,
Flags: podPsFlags,
Action: podPsCmd,
UseShortOptionHandling: true,
}
)
func podPsCmd(c *cli.Context) error {
if err := validateFlags(c, podPsFlags); err != nil {
return err
}
if err := podCheckFlagsPassed(c); err != nil {
return errors.Wrapf(err, "error with flags passed")
}
runtime, err := libpodruntime.GetRuntime(c)
if err != nil {
return errors.Wrapf(err, "error creating libpod runtime")
}
defer runtime.Shutdown(false)
if len(c.Args()) > 0 {
return errors.Errorf("too many arguments, ps takes no arguments")
}
format := genPodPsFormat(c.Bool("quiet"))
opts := podPsOptions{
Format: format,
NoTrunc: c.Bool("no-trunc"),
Quiet: c.Bool("quiet"),
}
var filterFuncs []libpod.PodFilter
pods, err := runtime.Pods(filterFuncs...)
if err != nil {
return err
}
return generatePodPsOutput(pods, opts, runtime)
}
// podCheckFlagsPassed checks if mutually exclusive flags are passed together
func podCheckFlagsPassed(c *cli.Context) error {
// quiet, and format with Go template are mutually exclusive
flags := 0
if c.Bool("quiet") {
flags++
}
if flags > 1 {
return errors.Errorf("quiet, and format with Go template are mutually exclusive")
}
return nil
}
// generate the template based on conditions given
func genPodPsFormat(quiet bool) string {
if quiet {
return formats.IDString
}
format := "table {{.ID}}\t{{.Name}}"
return format
}
func podPsToGeneric(templParams []podPsTemplateParams, JSONParams []podPsJSONParams) (genericParams []interface{}) {
if len(templParams) > 0 {
for _, v := range templParams {
genericParams = append(genericParams, interface{}(v))
}
return
}
for _, v := range JSONParams {
genericParams = append(genericParams, interface{}(v))
}
return
}
// generate the accurate header based on template given
func (p *podPsTemplateParams) podHeaderMap() map[string]string {
v := reflect.Indirect(reflect.ValueOf(p))
values := make(map[string]string)
for i := 0; i < v.NumField(); i++ {
key := v.Type().Field(i).Name
value := key
if value == "ID" {
value = "Pod" + value
}
values[key] = strings.ToUpper(splitCamelCase(value))
}
return values
}
// getPodTemplateOutput returns the modified container information
func getPodTemplateOutput(psParams []podPsJSONParams, opts podPsOptions) ([]podPsTemplateParams, error) {
var (
psOutput []podPsTemplateParams
)
for _, psParam := range psParams {
podID := psParam.ID
if !opts.NoTrunc {
podID = shortID(psParam.ID)
}
params := podPsTemplateParams{
ID: podID,
Name: psParam.Name,
}
psOutput = append(psOutput, params)
}
return psOutput, nil
}
// getAndSortPodJSONOutput returns the container info in its raw, sorted form
func getAndSortPodJSONParams(pods []*libpod.Pod, opts podPsOptions, runtime *libpod.Runtime) ([]podPsJSONParams, error) {
var (
psOutput []podPsJSONParams
)
for _, pod := range pods {
ctrs, err := runtime.ContainersInPod(pod)
if err != nil {
return nil, err
}
ctrNum := len(ctrs)
params := podPsJSONParams{
ID: pod.ID(),
Name: pod.Name(),
NumberOfContainers: ctrNum,
}
psOutput = append(psOutput, params)
}
return psOutput, nil
}
func generatePodPsOutput(pods []*libpod.Pod, opts podPsOptions, runtime *libpod.Runtime) error {
if len(pods) == 0 && opts.Format != formats.JSONString {
return nil
}
psOutput, err := getAndSortPodJSONParams(pods, opts, runtime)
if err != nil {
return err
}
var out formats.Writer
switch opts.Format {
case formats.JSONString:
if err != nil {
return errors.Wrapf(err, "unable to create JSON for output")
}
out = formats.JSONStructArray{Output: podPsToGeneric([]podPsTemplateParams{}, psOutput)}
default:
psOutput, err := getPodTemplateOutput(psOutput, opts)
if err != nil {
return errors.Wrapf(err, "unable to create output")
}
out = formats.StdoutTemplateArray{Output: podPsToGeneric(psOutput, []podPsJSONParams{}), Template: opts.Format, Fields: psOutput[0].podHeaderMap()}
}
return formats.Writer(out).Out()
}
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