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ps.go
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/
ps.go
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package main
import (
"fmt"
"os"
"text/tabwriter"
"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 {
var (
id = context.Args().First()
ctx, cancel = appContext(context)
)
defer cancel()
if id == "" {
return errors.New("container id must be provided")
}
client, err := newClient(context)
if err != nil {
return err
}
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, 10, 1, 3, ' ', 0)
fmt.Fprintln(w, "PID")
for _, ps := range processes {
if _, err := fmt.Fprintf(w, "%d\n", ps); err != nil {
return err
}
}
if err := w.Flush(); err != nil {
return err
}
return nil
},
}