Fixes #10457-Pause-and-unpause-accept-multi-containers

Applied multi parameters to pause and unpause.
Created a new test file dedicated for pause commands.
Created a new utility function to get a slice of paused containers.
Updated documentation

Signed-off-by: André Martins <martins@noironetworks.com>

api/client/commands.go

@@ -786,8 +786,8 @@ func (cli *DockerCli) CmdStart(args ...string) error {
 }
 
 func (cli *DockerCli) CmdUnpause(args ...string) error {
-	cmd := cli.Subcmd("unpause", "CONTAINER", "Unpause all processes within a container", true)
-	cmd.Require(flag.Exact, 1)
+	cmd := cli.Subcmd("unpause", "CONTAINER [CONTAINER...]", "Unpause all processes within a container", true)
+	cmd.Require(flag.Min, 1)
 	utils.ParseFlags(cmd, args, false)
 
 	var encounteredError error
@@ -803,8 +803,8 @@ func (cli *DockerCli) CmdUnpause(args ...string) error {
 }
 
 func (cli *DockerCli) CmdPause(args ...string) error {
-	cmd := cli.Subcmd("pause", "CONTAINER", "Pause all processes within a container", true)
-	cmd.Require(flag.Exact, 1)
+	cmd := cli.Subcmd("pause", "CONTAINER [CONTAINER...]", "Pause all processes within a container", true)
+	cmd.Require(flag.Min, 1)
 	utils.ParseFlags(cmd, args, false)
 
 	var encounteredError error

docs/man/docker-pause.1.md

@@ -6,7 +6,7 @@ docker-pause - Pause all processes within a container
 
 # SYNOPSIS
 **docker pause**
-CONTAINER
+CONTAINER [CONTAINER...]
 
 # DESCRIPTION
 

docs/man/docker-unpause.1.md

@@ -6,7 +6,7 @@ docker-unpause - Unpause all processes within a container
 
 # SYNOPSIS
 **docker unpause**
-CONTAINER
+CONTAINER [CONTAINER...]
 
 # DESCRIPTION
 

docs/sources/reference/commandline/cli.md

@@ -1359,7 +1359,7 @@ nano-second part of the timestamp will be padded with zero when necessary.
 
 ## pause
 
-    Usage: docker pause CONTAINER
+    Usage: docker pause CONTAINER [CONTAINER...]
 
     Pause all processes within a container
 
@@ -1396,22 +1396,6 @@ just a specific mapping:
     $ sudo docker port test 7890
     0.0.0.0:4321
 
-## pause
-
-    Usage: docker pause CONTAINER
-
-    Pause all processes within a container
-
-The `docker pause` command uses the cgroups freezer to suspend all processes in
-a container.  Traditionally when suspending a process the `SIGSTOP` signal is
-used, which is observable by the process being suspended. With the cgroups freezer
-the process is unaware, and unable to capture, that it is being suspended,
-and subsequently resumed.
-
-See the
-[cgroups freezer documentation](https://www.kernel.org/doc/Documentation/cgroups/freezer-subsystem.txt)
-for further details.
-
 ## rename
 
     Usage: docker rename OLD_NAME NEW_NAME
@@ -2081,7 +2065,7 @@ them to [*Share Images via Repositories*](
 
 ## unpause
 
-    Usage: docker unpause CONTAINER
+    Usage: docker unpause CONTAINER [CONTAINER...]
 
     Unpause all processes within a container
 

integration-cli/docker_cli_events_test.go

@@ -30,41 +30,6 @@ func TestEventsUntag(t *testing.T) {
 	logDone("events - untags are logged")
 }
 
-func TestEventsPause(t *testing.T) {
-	name := "testeventpause"
-	out, _, _ := dockerCmd(t, "images", "-q")
-	image := strings.Split(out, "\n")[0]
-	dockerCmd(t, "run", "-d", "--name", name, image, "sleep", "2")
-	dockerCmd(t, "pause", name)
-	dockerCmd(t, "unpause", name)
-
-	defer deleteAllContainers()
-
-	eventsCmd := exec.Command(dockerBinary, "events", "--since=0", fmt.Sprintf("--until=%d", time.Now().Unix()))
-	out, _, _ = runCommandWithOutput(eventsCmd)
-	events := strings.Split(out, "\n")
-	if len(events) <= 1 {
-		t.Fatalf("Missing expected event")
-	}
-
-	pauseEvent := strings.Fields(events[len(events)-3])
-	unpauseEvent := strings.Fields(events[len(events)-2])
-
-	if pauseEvent[len(pauseEvent)-1] != "pause" {
-		t.Fatalf("event should be pause, not %#v", pauseEvent)
-	}
-	if unpauseEvent[len(unpauseEvent)-1] != "unpause" {
-		t.Fatalf("event should be unpause, not %#v", unpauseEvent)
-	}
-
-	waitCmd := exec.Command(dockerBinary, "wait", name)
-	if waitOut, _, err := runCommandWithOutput(waitCmd); err != nil {
-		t.Fatalf("error thrown while waiting for container: %s, %v", waitOut, err)
-	}
-
-	logDone("events - pause/unpause is logged")
-}
-
 func TestEventsContainerFailStartDie(t *testing.T) {
 	defer deleteAllContainers()
 

integration-cli/docker_cli_pause_test.go

@@ -0,0 +1,113 @@
+package main
+
+import (
+	"fmt"
+	"os/exec"
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestPause(t *testing.T) {
+	defer deleteAllContainers()
+	defer unpauseAllContainers()
+
+	name := "testeventpause"
+	out, _, _ := dockerCmd(t, "images", "-q")
+	image := strings.Split(out, "\n")[0]
+	dockerCmd(t, "run", "-d", "--name", name, image, "sleep", "2")
+
+	dockerCmd(t, "pause", name)
+	pausedContainers, err := getSliceOfPausedContainers()
+	if err != nil {
+		t.Fatalf("error thrown while checking if containers were paused: %v", err)
+	}
+	if len(pausedContainers) != 1 {
+		t.Fatalf("there should be one paused container and not", len(pausedContainers))
+	}
+
+	dockerCmd(t, "unpause", name)
+
+	eventsCmd := exec.Command(dockerBinary, "events", "--since=0", fmt.Sprintf("--until=%d", time.Now().Unix()))
+	out, _, _ = runCommandWithOutput(eventsCmd)
+	events := strings.Split(out, "\n")
+	if len(events) <= 1 {
+		t.Fatalf("Missing expected event")
+	}
+
+	pauseEvent := strings.Fields(events[len(events)-3])
+	unpauseEvent := strings.Fields(events[len(events)-2])
+
+	if pauseEvent[len(pauseEvent)-1] != "pause" {
+		t.Fatalf("event should be pause, not %#v", pauseEvent)
+	}
+	if unpauseEvent[len(unpauseEvent)-1] != "unpause" {
+		t.Fatalf("event should be unpause, not %#v", unpauseEvent)
+	}
+
+	waitCmd := exec.Command(dockerBinary, "wait", name)
+	if waitOut, _, err := runCommandWithOutput(waitCmd); err != nil {
+		t.Fatalf("error thrown while waiting for container: %s, %v", waitOut, err)
+	}
+
+	logDone("pause - pause/unpause is logged")
+}
+
+func TestPauseMultipleContainers(t *testing.T) {
+	defer deleteAllContainers()
+	defer unpauseAllContainers()
+
+	containers := []string{
+		"testpausewithmorecontainers1",
+		"testpausewithmorecontainers2",
+	}
+	out, _, _ := dockerCmd(t, "images", "-q")
+	image := strings.Split(out, "\n")[0]
+	for _, name := range containers {
+		dockerCmd(t, "run", "-d", "--name", name, image, "sleep", "2")
+	}
+	dockerCmd(t, append([]string{"pause"}, containers...)...)
+	pausedContainers, err := getSliceOfPausedContainers()
+	if err != nil {
+		t.Fatalf("error thrown while checking if containers were paused: %v", err)
+	}
+	if len(pausedContainers) != len(containers) {
+		t.Fatalf("there should be %d paused container and not %d", len(containers), len(pausedContainers))
+	}
+
+	dockerCmd(t, append([]string{"unpause"}, containers...)...)
+
+	eventsCmd := exec.Command(dockerBinary, "events", "--since=0", fmt.Sprintf("--until=%d", time.Now().Unix()))
+	out, _, _ = runCommandWithOutput(eventsCmd)
+	events := strings.Split(out, "\n")
+	if len(events) <= len(containers)*3-2 {
+		t.Fatalf("Missing expected event")
+	}
+
+	pauseEvents := make([][]string, len(containers))
+	unpauseEvents := make([][]string, len(containers))
+	for i := range containers {
+		pauseEvents[i] = strings.Fields(events[len(events)-len(containers)*2-1+i])
+		unpauseEvents[i] = strings.Fields(events[len(events)-len(containers)-1+i])
+	}
+
+	for _, pauseEvent := range pauseEvents {
+		if pauseEvent[len(pauseEvent)-1] != "pause" {
+			t.Fatalf("event should be pause, not %#v", pauseEvent)
+		}
+	}
+	for _, unpauseEvent := range unpauseEvents {
+		if unpauseEvent[len(unpauseEvent)-1] != "unpause" {
+			t.Fatalf("event should be unpause, not %#v", unpauseEvent)
+		}
+	}
+
+	for _, name := range containers {
+		waitCmd := exec.Command(dockerBinary, "wait", name)
+		if waitOut, _, err := runCommandWithOutput(waitCmd); err != nil {
+			t.Fatalf("error thrown while waiting for container: %s, %v", waitOut, err)
+		}
+	}
+
+	logDone("pause - multi pause/unpause is logged")
+}

integration-cli/docker_utils.go

@@ -380,6 +380,16 @@ func getPausedContainers() (string, error) {
 	return out, err
 }
 
+func getSliceOfPausedContainers() ([]string, error) {
+	out, err := getPausedContainers()
+	if err == nil {
+		slice := strings.Split(strings.TrimSpace(out), "\n")
+		return slice, err
+	} else {
+		return []string{out}, err
+	}
+}
+
 func unpauseContainer(container string) error {
 	unpauseCmd := exec.Command(dockerBinary, "unpause", container)
 	exitCode, err := runCommand(unpauseCmd)