Add kpod pause and kpod unpause

Implement the ability to pause and unpause running containers.

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
Signed-off-by: TomSweeneyRedHat <tsweeney@redhat.com>

cmd/kpod/main.go

@@ -40,6 +40,7 @@ func main() {
 		loadCommand,
 		logsCommand,
 		mountCommand,
+		pauseCommand,
 		psCommand,
 		pullCommand,
 		pushCommand,
@@ -51,6 +52,7 @@ func main() {
 		stopCommand,
 		tagCommand,
 		umountCommand,
+		unpauseCommand,
 		versionCommand,
 	}
 	app.Before = func(c *cli.Context) error {

cmd/kpod/pause.go

@@ -0,0 +1,58 @@
+package main
+
+import (
+	"fmt"
+	"github.com/kubernetes-incubator/cri-o/libkpod"
+	"github.com/pkg/errors"
+	"github.com/urfave/cli"
+	"os"
+)
+
+var (
+	pauseDescription = `
+   kpod pause
+
+   Pauses one or more running containers.  The container name or ID can be used.
+`
+	pauseCommand = cli.Command{
+		Name:        "pause",
+		Usage:       "Pauses all the processes in one or more containers",
+		Description: pauseDescription,
+		Action:      pauseCmd,
+		ArgsUsage:   "CONTAINER-NAME [CONTAINER-NAME ...]",
+	}
+)
+
+func pauseCmd(c *cli.Context) error {
+	args := c.Args()
+	if len(args) < 1 {
+		return errors.Errorf("you must provide at least one container name or id")
+	}
+
+	config, err := getConfig(c)
+	if err != nil {
+		return errors.Wrapf(err, "could not get config")
+	}
+	server, err := libkpod.New(config)
+	if err != nil {
+		return errors.Wrapf(err, "could not get container server")
+	}
+	defer server.Shutdown()
+	if err := server.Update(); err != nil {
+		return errors.Wrapf(err, "could not update list of containers")
+	}
+	var lastError error
+	for _, container := range c.Args() {
+		cid, err := server.ContainerPause(container)
+		if err != nil {
+			if lastError != nil {
+				fmt.Fprintln(os.Stderr, lastError)
+			}
+			lastError = errors.Wrapf(err, "failed to pause container %v", container)
+		} else {
+			fmt.Println(cid)
+		}
+	}
+
+	return lastError
+}

cmd/kpod/unpause.go

@@ -0,0 +1,58 @@
+package main
+
+import (
+	"fmt"
+	"github.com/kubernetes-incubator/cri-o/libkpod"
+	"github.com/pkg/errors"
+	"github.com/urfave/cli"
+	"os"
+)
+
+var (
+	unpauseDescription = `
+   kpod unpause
+
+   Unpauses one or more running containers.  The container name or ID can be used.
+`
+	unpauseCommand = cli.Command{
+		Name:        "unpause",
+		Usage:       "Unpause the processes in one or more containers",
+		Description: unpauseDescription,
+		Action:      unpauseCmd,
+		ArgsUsage:   "CONTAINER-NAME [CONTAINER-NAME ...]",
+	}
+)
+
+func unpauseCmd(c *cli.Context) error {
+	args := c.Args()
+	if len(args) < 1 {
+		return errors.Errorf("you must provide at least one container name or id")
+	}
+
+	config, err := getConfig(c)
+	if err != nil {
+		return errors.Wrapf(err, "could not get config")
+	}
+	server, err := libkpod.New(config)
+	if err != nil {
+		return errors.Wrapf(err, "could not get container server")
+	}
+	defer server.Shutdown()
+	if err := server.Update(); err != nil {
+		return errors.Wrapf(err, "could not update list of containers")
+	}
+	var lastError error
+	for _, container := range c.Args() {
+		cid, err := server.ContainerUnpause(container)
+		if err != nil {
+			if lastError != nil {
+				fmt.Fprintln(os.Stderr, lastError)
+			}
+			lastError = errors.Wrapf(err, "failed to unpause container %v", container)
+		} else {
+			fmt.Println(cid)
+		}
+	}
+
+	return lastError
+}