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ps.go
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/
ps.go
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package tasks
import (
"fmt"
"os"
"text/tabwriter"
"github.com/containerd/containerd/cmd/ctr/commands"
"github.com/containerd/typeurl"
"github.com/pkg/errors"
"github.com/urfave/cli"
)
var psCommand = cli.Command{
Name: "ps",
Usage: "list processes for container",
ArgsUsage: "CONTAINER",
Action: func(context *cli.Context) error {
id := context.Args().First()
if id == "" {
return errors.New("container id must be provided")
}
client, ctx, cancel, err := commands.NewClient(context)
if err != nil {
return err
}
defer cancel()
container, err := client.LoadContainer(ctx, id)
if err != nil {
return err
}
task, err := container.Task(ctx, nil)
if err != nil {
return err
}
processes, err := task.Pids(ctx)
if err != nil {
return err
}
w := tabwriter.NewWriter(os.Stdout, 1, 8, 4, ' ', 0)
fmt.Fprintln(w, "PID\tINFO")
for _, ps := range processes {
var info interface{} = "-"
if ps.Info != nil {
info, err = typeurl.UnmarshalAny(ps.Info)
if err != nil {
return err
}
}
if _, err := fmt.Fprintf(w, "%d\t%+v\n", ps.Pid, info); err != nil {
return err
}
}
return w.Flush()
},
}