Use dockerCmd when possible (#14603)

- integration-cli/docker_cli_attach_test.go
- integration-cli/docker_cli_attach_unix_test.go
- integration-cli/docker_cli_build_test.go
- integration-cli/docker_cli_build_unix_test.go
- integration-cli/docker_cli_by_digest_test.go
- integration-cli/docker_cli_commit_test.go
- integration-cli/docker_cli_config_test.go
- integration-cli/docker_cli_cp_test.go
- integration-cli/docker_cli_create_test.go
- integration-cli/docker_cli_pause_test.go
- integration-cli/docker_cli_port_test.go
- integration-cli/docker_cli_port_unix_test.go
- integration-cli/docker_cli_proxy_test.go
- integration-cli/docker_cli_ps_test.go
- integration-cli/docker_cli_pull_test.go
- integration-cli/docker_cli_push_test.go

- docker_api_attach_test.go
- docker_api_containers_test.go
- docker_api_events_test.go
- docker_api_exec_resize_test.go
- docker_api_exec_test.go
- docker_api_images_test.go
- docker_api_info_test.go

Signed-off-by: Vincent Demeester <vincent@sbr.pm>

integration-cli/docker_api_attach_test.go

@@ -5,7 +5,6 @@ import (
 	"io"
 	"net/http"
 	"net/http/httputil"
-	"os/exec"
 	"strings"
 	"time"
 
@@ -14,11 +13,7 @@ import (
 )
 
 func (s *DockerSuite) TestGetContainersAttachWebsocket(c *check.C) {
-	runCmd := exec.Command(dockerBinary, "run", "-dit", "busybox", "cat")
-	out, _, err := runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatalf(out, err)
-	}
+	out, _ := dockerCmd(c, "run", "-dit", "busybox", "cat")
 
 	rwc, err := sockConn(time.Duration(10 * time.Second))
 	if err != nil {
@@ -102,9 +97,7 @@ func (s *DockerSuite) TestGetContainersWsAttachContainerNotFound(c *check.C) {
 }
 
 func (s *DockerSuite) TestPostContainersAttach(c *check.C) {
-	runCmd := exec.Command(dockerBinary, "run", "-dit", "busybox", "cat")
-	out, _, err := runCommandWithOutput(runCmd)
-	c.Assert(err, check.IsNil)
+	out, _ := dockerCmd(c, "run", "-dit", "busybox", "cat")
 
 	r, w := io.Pipe()
 	defer r.Close()
@@ -167,9 +160,7 @@ func (s *DockerSuite) TestPostContainersAttach(c *check.C) {
 }
 
 func (s *DockerSuite) TestPostContainersAttachStderr(c *check.C) {
-	runCmd := exec.Command(dockerBinary, "run", "-dit", "busybox", "/bin/sh", "-c", "cat >&2")
-	out, _, err := runCommandWithOutput(runCmd)
-	c.Assert(err, check.IsNil)
+	out, _ := dockerCmd(c, "run", "-dit", "busybox", "/bin/sh", "-c", "cat >&2")
 
 	r, w := io.Pipe()
 	defer r.Close()

integration-cli/docker_api_containers_test.go

@@ -8,7 +8,6 @@ import (
 	"net/http"
 	"net/http/httputil"
 	"os"
-	"os/exec"
 	"strconv"
 	"strings"
 	"time"
@@ -26,11 +25,7 @@ func (s *DockerSuite) TestContainerApiGetAll(c *check.C) {
 	}
 
 	name := "getall"
-	runCmd := exec.Command(dockerBinary, "run", "--name", name, "busybox", "true")
-	out, _, err := runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatalf("Error on container creation: %v, output: %q", err, out)
-	}
+	dockerCmd(c, "run", "--name", name, "busybox", "true")
 
 	status, body, err := sockRequest("GET", "/containers/json?all=1", nil)
 	c.Assert(err, check.IsNil)
@@ -54,9 +49,7 @@ func (s *DockerSuite) TestContainerApiGetAll(c *check.C) {
 
 // regression test for empty json field being omitted #13691
 func (s *DockerSuite) TestContainerApiGetJSONNoFieldsOmitted(c *check.C) {
-	runCmd := exec.Command(dockerBinary, "run", "busybox", "true")
-	_, err := runCommand(runCmd)
-	c.Assert(err, check.IsNil)
+	dockerCmd(c, "run", "busybox", "true")
 
 	status, body, err := sockRequest("GET", "/containers/json?all=1", nil)
 	c.Assert(err, check.IsNil)
@@ -94,9 +87,7 @@ type containerPs struct {
 func (s *DockerSuite) TestContainerPsOmitFields(c *check.C) {
 	name := "pstest"
 	port := 80
-	runCmd := exec.Command(dockerBinary, "run", "-d", "--name", name, "--expose", strconv.Itoa(port), "busybox", "top")
-	_, err := runCommand(runCmd)
-	c.Assert(err, check.IsNil)
+	dockerCmd(c, "run", "-d", "--name", name, "--expose", strconv.Itoa(port), "busybox", "top")
 
 	status, body, err := sockRequest("GET", "/containers/json?all=1", nil)
 	c.Assert(err, check.IsNil)
@@ -126,11 +117,7 @@ func (s *DockerSuite) TestContainerPsOmitFields(c *check.C) {
 
 func (s *DockerSuite) TestContainerApiGetExport(c *check.C) {
 	name := "exportcontainer"
-	runCmd := exec.Command(dockerBinary, "run", "--name", name, "busybox", "touch", "/test")
-	out, _, err := runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatalf("Error on container creation: %v, output: %q", err, out)
-	}
+	dockerCmd(c, "run", "--name", name, "busybox", "touch", "/test")
 
 	status, body, err := sockRequest("GET", "/containers/"+name+"/export", nil)
 	c.Assert(err, check.IsNil)
@@ -158,11 +145,7 @@ func (s *DockerSuite) TestContainerApiGetExport(c *check.C) {
 
 func (s *DockerSuite) TestContainerApiGetChanges(c *check.C) {
 	name := "changescontainer"
-	runCmd := exec.Command(dockerBinary, "run", "--name", name, "busybox", "rm", "/etc/passwd")
-	out, _, err := runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatalf("Error on container creation: %v, output: %q", err, out)
-	}
+	dockerCmd(c, "run", "--name", name, "busybox", "rm", "/etc/passwd")
 
 	status, body, err := sockRequest("GET", "/containers/"+name+"/changes", nil)
 	c.Assert(err, check.IsNil)
@@ -248,9 +231,7 @@ func (s *DockerSuite) TestContainerApiStartVolumesFrom(c *check.C) {
 	volName := "voltst"
 	volPath := "/tmp"
 
-	if out, _, err := runCommandWithOutput(exec.Command(dockerBinary, "run", "-d", "--name", volName, "-v", volPath, "busybox")); err != nil {
-		c.Fatal(out, err)
-	}
+	dockerCmd(c, "run", "-d", "--name", volName, "-v", volPath, "busybox")
 
 	name := "TestContainerApiStartDupVolumeBinds"
 	config := map[string]interface{}{
@@ -285,13 +266,10 @@ func (s *DockerSuite) TestContainerApiStartVolumesFrom(c *check.C) {
 
 func (s *DockerSuite) TestGetContainerStats(c *check.C) {
 	var (
-		name   = "statscontainer"
-		runCmd = exec.Command(dockerBinary, "run", "-d", "--name", name, "busybox", "top")
+		name = "statscontainer"
 	)
-	out, _, err := runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatalf("Error on container creation: %v, output: %q", err, out)
-	}
+	dockerCmd(c, "run", "-d", "--name", name, "busybox", "top")
+
 	type b struct {
 		status int
 		body   []byte
@@ -305,9 +283,7 @@ func (s *DockerSuite) TestGetContainerStats(c *check.C) {
 
 	// allow some time to stream the stats from the container
 	time.Sleep(4 * time.Second)
-	if _, err := runCommand(exec.Command(dockerBinary, "rm", "-f", name)); err != nil {
-		c.Fatal(err)
-	}
+	dockerCmd(c, "rm", "-f", name)
 
 	// collect the results from the stats stream or timeout and fail
 	// if the stream was not disconnected.
@@ -353,7 +329,7 @@ func (s *DockerSuite) TestGetContainerStatsRmRunning(c *check.C) {
 	c.Assert(err, check.IsNil)
 
 	// Now remove without `-f` and make sure we are still pulling stats
-	_, err = runCommand(exec.Command(dockerBinary, "rm", id))
+	_, _, err = dockerCmdWithError(c, "rm", id)
 	c.Assert(err, check.Not(check.IsNil), check.Commentf("rm should have failed but didn't"))
 	_, err = buf.ReadTimeout(b, 2*time.Second)
 	c.Assert(err, check.IsNil)
@@ -368,9 +344,7 @@ func (s *DockerSuite) TestGetContainerStatsRmRunning(c *check.C) {
 // stream false always return one stat)
 func (s *DockerSuite) TestGetContainerStatsStream(c *check.C) {
 	name := "statscontainer"
-	runCmd := exec.Command(dockerBinary, "run", "-d", "--name", name, "busybox", "top")
-	_, err := runCommand(runCmd)
-	c.Assert(err, check.IsNil)
+	dockerCmd(c, "run", "-d", "--name", name, "busybox", "top")
 
 	type b struct {
 		status int
@@ -385,9 +359,7 @@ func (s *DockerSuite) TestGetContainerStatsStream(c *check.C) {
 
 	// allow some time to stream the stats from the container
 	time.Sleep(4 * time.Second)
-	if _, err := runCommand(exec.Command(dockerBinary, "rm", "-f", name)); err != nil {
-		c.Fatal(err)
-	}
+	dockerCmd(c, "rm", "-f", name)
 
 	// collect the results from the stats stream or timeout and fail
 	// if the stream was not disconnected.
@@ -408,9 +380,7 @@ func (s *DockerSuite) TestGetContainerStatsStream(c *check.C) {
 
 func (s *DockerSuite) TestGetContainerStatsNoStream(c *check.C) {
 	name := "statscontainer"
-	runCmd := exec.Command(dockerBinary, "run", "-d", "--name", name, "busybox", "top")
-	_, err := runCommand(runCmd)
-	c.Assert(err, check.IsNil)
+	dockerCmd(c, "run", "-d", "--name", name, "busybox", "top")
 
 	type b struct {
 		status int
@@ -425,9 +395,7 @@ func (s *DockerSuite) TestGetContainerStatsNoStream(c *check.C) {
 
 	// allow some time to stream the stats from the container
 	time.Sleep(4 * time.Second)
-	if _, err := runCommand(exec.Command(dockerBinary, "rm", "-f", name)); err != nil {
-		c.Fatal(err)
-	}
+	dockerCmd(c, "rm", "-f", name)
 
 	// collect the results from the stats stream or timeout and fail
 	// if the stream was not disconnected.
@@ -449,13 +417,9 @@ func (s *DockerSuite) TestGetContainerStatsNoStream(c *check.C) {
 func (s *DockerSuite) TestGetStoppedContainerStats(c *check.C) {
 	// TODO: this test does nothing because we are c.Assert'ing in goroutine
 	var (
-		name   = "statscontainer"
-		runCmd = exec.Command(dockerBinary, "create", "--name", name, "busybox", "top")
+		name = "statscontainer"
 	)
-	out, _, err := runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatalf("Error on container creation: %v, output: %q", err, out)
-	}
+	dockerCmd(c, "create", "--name", name, "busybox", "top")
 
 	go func() {
 		// We'll never get return for GET stats from sockRequest as of now,
@@ -739,20 +703,14 @@ func (s *DockerSuite) TestBuildApiDockerfileSymlink(c *check.C) {
 
 // #9981 - Allow a docker created volume (ie, one in /var/lib/docker/volumes) to be used to overwrite (via passing in Binds on api start) an existing volume
 func (s *DockerSuite) TestPostContainerBindNormalVolume(c *check.C) {
-	out, _, err := runCommandWithOutput(exec.Command(dockerBinary, "create", "-v", "/foo", "--name=one", "busybox"))
-	if err != nil {
-		c.Fatal(err, out)
-	}
+	dockerCmd(c, "create", "-v", "/foo", "--name=one", "busybox")
 
 	fooDir, err := inspectFieldMap("one", "Volumes", "/foo")
 	if err != nil {
 		c.Fatal(err)
 	}
 
-	out, _, err = runCommandWithOutput(exec.Command(dockerBinary, "create", "-v", "/foo", "--name=two", "busybox"))
-	if err != nil {
-		c.Fatal(err, out)
-	}
+	dockerCmd(c, "create", "-v", "/foo", "--name=two", "busybox")
 
 	bindSpec := map[string][]string{"Binds": {fooDir + ":/foo"}}
 	status, _, err := sockRequest("POST", "/containers/two/start", bindSpec)
@@ -771,12 +729,7 @@ func (s *DockerSuite) TestPostContainerBindNormalVolume(c *check.C) {
 
 func (s *DockerSuite) TestContainerApiPause(c *check.C) {
 	defer unpauseAllContainers()
-	runCmd := exec.Command(dockerBinary, "run", "-d", "busybox", "sleep", "30")
-	out, _, err := runCommandWithOutput(runCmd)
-
-	if err != nil {
-		c.Fatalf("failed to create a container: %s, %v", out, err)
-	}
+	out, _ := dockerCmd(c, "run", "-d", "busybox", "sleep", "30")
 	ContainerID := strings.TrimSpace(out)
 
 	status, _, err := sockRequest("POST", "/containers/"+ContainerID+"/pause", nil)
@@ -809,10 +762,7 @@ func (s *DockerSuite) TestContainerApiPause(c *check.C) {
 }
 
 func (s *DockerSuite) TestContainerApiTop(c *check.C) {
-	out, err := exec.Command(dockerBinary, "run", "-d", "busybox", "/bin/sh", "-c", "top").CombinedOutput()
-	if err != nil {
-		c.Fatal(err, out)
-	}
+	out, _ := dockerCmd(c, "run", "-d", "busybox", "/bin/sh", "-c", "top")
 	id := strings.TrimSpace(string(out))
 	if err := waitRun(id); err != nil {
 		c.Fatal(err)
@@ -851,10 +801,7 @@ func (s *DockerSuite) TestContainerApiTop(c *check.C) {
 
 func (s *DockerSuite) TestContainerApiCommit(c *check.C) {
 	cName := "testapicommit"
-	out, err := exec.Command(dockerBinary, "run", "--name="+cName, "busybox", "/bin/sh", "-c", "touch /test").CombinedOutput()
-	if err != nil {
-		c.Fatal(err, out)
-	}
+	dockerCmd(c, "run", "--name="+cName, "busybox", "/bin/sh", "-c", "touch /test")
 
 	name := "TestContainerApiCommit"
 	status, b, err := sockRequest("POST", "/commit?repo="+name+"&testtag=tag&container="+cName, nil)
@@ -877,18 +824,12 @@ func (s *DockerSuite) TestContainerApiCommit(c *check.C) {
 		c.Fatalf("got wrong Cmd from commit: %q", cmd)
 	}
 	// sanity check, make sure the image is what we think it is
-	out, err = exec.Command(dockerBinary, "run", img.Id, "ls", "/test").CombinedOutput()
-	if err != nil {
-		c.Fatalf("error checking committed image: %v - %q", err, string(out))
-	}
+	dockerCmd(c, "run", img.Id, "ls", "/test")
 }
 
 func (s *DockerSuite) TestContainerApiCommitWithLabelInConfig(c *check.C) {
 	cName := "testapicommitwithconfig"
-	out, err := exec.Command(dockerBinary, "run", "--name="+cName, "busybox", "/bin/sh", "-c", "touch /test").CombinedOutput()
-	if err != nil {
-		c.Fatal(err, out)
-	}
+	dockerCmd(c, "run", "--name="+cName, "busybox", "/bin/sh", "-c", "touch /test")
 
 	config := map[string]interface{}{
 		"Labels": map[string]string{"key1": "value1", "key2": "value2"},
@@ -928,10 +869,7 @@ func (s *DockerSuite) TestContainerApiCommitWithLabelInConfig(c *check.C) {
 	}
 
 	// sanity check, make sure the image is what we think it is
-	out, err = exec.Command(dockerBinary, "run", img.Id, "ls", "/test").CombinedOutput()
-	if err != nil {
-		c.Fatalf("error checking committed image: %v - %q", err, string(out))
-	}
+	dockerCmd(c, "run", img.Id, "ls", "/test")
 }
 
 func (s *DockerSuite) TestContainerApiCreate(c *check.C) {
@@ -952,11 +890,8 @@ func (s *DockerSuite) TestContainerApiCreate(c *check.C) {
 		c.Fatal(err)
 	}
 
-	out, err := exec.Command(dockerBinary, "start", "-a", container.Id).CombinedOutput()
-	if err != nil {
-		c.Fatal(string(out), err)
-	}
-	if strings.TrimSpace(string(out)) != "/test" {
+	out, _ := dockerCmd(c, "start", "-a", container.Id)
+	if strings.TrimSpace(out) != "/test" {
 		c.Fatalf("expected output `/test`, got %q", out)
 	}
 }
@@ -1241,10 +1176,7 @@ func (s *DockerSuite) TestCreateWithTooLowMemoryLimit(c *check.C) {
 }
 
 func (s *DockerSuite) TestStartWithTooLowMemoryLimit(c *check.C) {
-	out, _, err := runCommandWithOutput(exec.Command(dockerBinary, "create", "busybox"))
-	if err != nil {
-		c.Fatal(err, out)
-	}
+	out, _ := dockerCmd(c, "create", "busybox")
 
 	containerID := strings.TrimSpace(out)
 
@@ -1265,9 +1197,7 @@ func (s *DockerSuite) TestStartWithTooLowMemoryLimit(c *check.C) {
 }
 
 func (s *DockerSuite) TestContainerApiRename(c *check.C) {
-	runCmd := exec.Command(dockerBinary, "run", "--name", "TestContainerApiRename", "-d", "busybox", "sh")
-	out, _, err := runCommandWithOutput(runCmd)
-	c.Assert(err, check.IsNil)
+	out, _ := dockerCmd(c, "run", "--name", "TestContainerApiRename", "-d", "busybox", "sh")
 
 	containerID := strings.TrimSpace(out)
 	newName := "TestContainerApiRenameNew"
@@ -1284,11 +1214,7 @@ func (s *DockerSuite) TestContainerApiRename(c *check.C) {
 
 func (s *DockerSuite) TestContainerApiKill(c *check.C) {
 	name := "test-api-kill"
-	runCmd := exec.Command(dockerBinary, "run", "-di", "--name", name, "busybox", "top")
-	out, _, err := runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatalf("Error on container creation: %v, output: %q", err, out)
-	}
+	dockerCmd(c, "run", "-di", "--name", name, "busybox", "top")
 
 	status, _, err := sockRequest("POST", "/containers/"+name+"/kill", nil)
 	c.Assert(err, check.IsNil)
@@ -1305,11 +1231,7 @@ func (s *DockerSuite) TestContainerApiKill(c *check.C) {
 
 func (s *DockerSuite) TestContainerApiRestart(c *check.C) {
 	name := "test-api-restart"
-	runCmd := exec.Command(dockerBinary, "run", "-di", "--name", name, "busybox", "top")
-	out, _, err := runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatalf("Error on container creation: %v, output: %q", err, out)
-	}
+	dockerCmd(c, "run", "-di", "--name", name, "busybox", "top")
 
 	status, _, err := sockRequest("POST", "/containers/"+name+"/restart?t=1", nil)
 	c.Assert(err, check.IsNil)
@@ -1322,11 +1244,7 @@ func (s *DockerSuite) TestContainerApiRestart(c *check.C) {
 
 func (s *DockerSuite) TestContainerApiRestartNotimeoutParam(c *check.C) {
 	name := "test-api-restart-no-timeout-param"
-	runCmd := exec.Command(dockerBinary, "run", "-di", "--name", name, "busybox", "top")
-	out, _, err := runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatalf("Error on container creation: %v, output: %q", err, out)
-	}
+	out, _ := dockerCmd(c, "run", "-di", "--name", name, "busybox", "top")
 	id := strings.TrimSpace(out)
 	c.Assert(waitRun(id), check.IsNil)
 
@@ -1364,11 +1282,7 @@ func (s *DockerSuite) TestContainerApiStart(c *check.C) {
 
 func (s *DockerSuite) TestContainerApiStop(c *check.C) {
 	name := "test-api-stop"
-	runCmd := exec.Command(dockerBinary, "run", "-di", "--name", name, "busybox", "top")
-	out, _, err := runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatalf("Error on container creation: %v, output: %q", err, out)
-	}
+	dockerCmd(c, "run", "-di", "--name", name, "busybox", "top")
 
 	status, _, err := sockRequest("POST", "/containers/"+name+"/stop?t=1", nil)
 	c.Assert(err, check.IsNil)
@@ -1386,11 +1300,7 @@ func (s *DockerSuite) TestContainerApiStop(c *check.C) {
 
 func (s *DockerSuite) TestContainerApiWait(c *check.C) {
 	name := "test-api-wait"
-	runCmd := exec.Command(dockerBinary, "run", "--name", name, "busybox", "sleep", "5")
-	out, _, err := runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatalf("Error on container creation: %v, output: %q", err, out)
-	}
+	dockerCmd(c, "run", "--name", name, "busybox", "sleep", "5")
 
 	status, body, err := sockRequest("POST", "/containers/"+name+"/wait", nil)
 	c.Assert(err, check.IsNil)
@@ -1412,9 +1322,7 @@ func (s *DockerSuite) TestContainerApiWait(c *check.C) {
 
 func (s *DockerSuite) TestContainerApiCopy(c *check.C) {
 	name := "test-container-api-copy"
-	runCmd := exec.Command(dockerBinary, "run", "--name", name, "busybox", "touch", "/test.txt")
-	_, err := runCommand(runCmd)
-	c.Assert(err, check.IsNil)
+	dockerCmd(c, "run", "--name", name, "busybox", "touch", "/test.txt")
 
 	postData := types.CopyConfig{
 		Resource: "/test.txt",
@@ -1443,9 +1351,7 @@ func (s *DockerSuite) TestContainerApiCopy(c *check.C) {
 
 func (s *DockerSuite) TestContainerApiCopyResourcePathEmpty(c *check.C) {
 	name := "test-container-api-copy-resource-empty"
-	runCmd := exec.Command(dockerBinary, "run", "--name", name, "busybox", "touch", "/test.txt")
-	_, err := runCommand(runCmd)
-	c.Assert(err, check.IsNil)
+	dockerCmd(c, "run", "--name", name, "busybox", "touch", "/test.txt")
 
 	postData := types.CopyConfig{
 		Resource: "",
@@ -1459,9 +1365,7 @@ func (s *DockerSuite) TestContainerApiCopyResourcePathEmpty(c *check.C) {
 
 func (s *DockerSuite) TestContainerApiCopyResourcePathNotFound(c *check.C) {
 	name := "test-container-api-copy-resource-not-found"
-	runCmd := exec.Command(dockerBinary, "run", "--name", name, "busybox")
-	_, err := runCommand(runCmd)
-	c.Assert(err, check.IsNil)
+	dockerCmd(c, "run", "--name", name, "busybox")
 
 	postData := types.CopyConfig{
 		Resource: "/notexist",
@@ -1484,16 +1388,12 @@ func (s *DockerSuite) TestContainerApiCopyContainerNotFound(c *check.C) {
 }
 
 func (s *DockerSuite) TestContainerApiDelete(c *check.C) {
-	runCmd := exec.Command(dockerBinary, "run", "-d", "busybox", "top")
-	out, _, err := runCommandWithOutput(runCmd)
-	c.Assert(err, check.IsNil)
+	out, _ := dockerCmd(c, "run", "-d", "busybox", "top")
 
 	id := strings.TrimSpace(out)
 	c.Assert(waitRun(id), check.IsNil)
 
-	stopCmd := exec.Command(dockerBinary, "stop", id)
-	_, err = runCommand(stopCmd)
-	c.Assert(err, check.IsNil)
+	dockerCmd(c, "stop", id)
 
 	status, _, err := sockRequest("DELETE", "/containers/"+id, nil)
 	c.Assert(err, check.IsNil)
@@ -1508,9 +1408,7 @@ func (s *DockerSuite) TestContainerApiDeleteNotExist(c *check.C) {
 }
 
 func (s *DockerSuite) TestContainerApiDeleteForce(c *check.C) {
-	runCmd := exec.Command(dockerBinary, "run", "-d", "busybox", "top")
-	out, _, err := runCommandWithOutput(runCmd)
-	c.Assert(err, check.IsNil)
+	out, _ := dockerCmd(c, "run", "-d", "busybox", "top")
 
 	id := strings.TrimSpace(out)
 	c.Assert(waitRun(id), check.IsNil)
@@ -1521,16 +1419,12 @@ func (s *DockerSuite) TestContainerApiDeleteForce(c *check.C) {
 }
 
 func (s *DockerSuite) TestContainerApiDeleteRemoveLinks(c *check.C) {
-	runCmd := exec.Command(dockerBinary, "run", "-d", "--name", "tlink1", "busybox", "top")
-	out, _, err := runCommandWithOutput(runCmd)
-	c.Assert(err, check.IsNil)
+	out, _ := dockerCmd(c, "run", "-d", "--name", "tlink1", "busybox", "top")
 
 	id := strings.TrimSpace(out)
 	c.Assert(waitRun(id), check.IsNil)
 
-	runCmd = exec.Command(dockerBinary, "run", "--link", "tlink1:tlink1", "--name", "tlink2", "-d", "busybox", "top")
-	out, _, err = runCommandWithOutput(runCmd)
-	c.Assert(err, check.IsNil)
+	out, _ = dockerCmd(c, "run", "--link", "tlink1:tlink1", "--name", "tlink2", "-d", "busybox", "top")
 
 	id2 := strings.TrimSpace(out)
 	c.Assert(waitRun(id2), check.IsNil)
@@ -1555,9 +1449,7 @@ func (s *DockerSuite) TestContainerApiDeleteRemoveLinks(c *check.C) {
 }
 
 func (s *DockerSuite) TestContainerApiDeleteConflict(c *check.C) {
-	runCmd := exec.Command(dockerBinary, "run", "-d", "busybox", "top")
-	out, _, err := runCommandWithOutput(runCmd)
-	c.Assert(err, check.IsNil)
+	out, _ := dockerCmd(c, "run", "-d", "busybox", "top")
 
 	id := strings.TrimSpace(out)
 	c.Assert(waitRun(id), check.IsNil)
@@ -1570,9 +1462,7 @@ func (s *DockerSuite) TestContainerApiDeleteConflict(c *check.C) {
 func (s *DockerSuite) TestContainerApiDeleteRemoveVolume(c *check.C) {
 	testRequires(c, SameHostDaemon)
 
-	runCmd := exec.Command(dockerBinary, "run", "-d", "-v", "/testvolume", "busybox", "top")
-	out, _, err := runCommandWithOutput(runCmd)
-	c.Assert(err, check.IsNil)
+	out, _ := dockerCmd(c, "run", "-d", "-v", "/testvolume", "busybox", "top")
 
 	id := strings.TrimSpace(out)
 	c.Assert(waitRun(id), check.IsNil)
@@ -1644,9 +1534,7 @@ func (s *DockerSuite) TestContainersApiChunkedEncoding(c *check.C) {
 }
 
 func (s *DockerSuite) TestPostContainerStop(c *check.C) {
-	runCmd := exec.Command(dockerBinary, "run", "-d", "busybox", "top")
-	out, _, err := runCommandWithOutput(runCmd)
-	c.Assert(err, check.IsNil)
+	out, _ := dockerCmd(c, "run", "-d", "busybox", "top")
 
 	containerID := strings.TrimSpace(out)
 	c.Assert(waitRun(containerID), check.IsNil)

integration-cli/docker_api_exec_resize_test.go

@@ -2,18 +2,13 @@ package main
 
 import (
 	"net/http"
-	"os/exec"
 	"strings"
 
 	"github.com/go-check/check"
 )
 
 func (s *DockerSuite) TestExecResizeApiHeightWidthNoInt(c *check.C) {
-	runCmd := exec.Command(dockerBinary, "run", "-d", "busybox", "top")
-	out, _, err := runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatalf(out, err)
-	}
+	out, _ := dockerCmd(c, "run", "-d", "busybox", "top")
 	cleanedContainerID := strings.TrimSpace(out)
 
 	endpoint := "/exec/" + cleanedContainerID + "/resize?h=foo&w=bar"

integration-cli/docker_api_exec_test.go

@@ -7,7 +7,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"net/http"
-	"os/exec"
 
 	"github.com/go-check/check"
 )
@@ -15,10 +14,7 @@ import (
 // Regression test for #9414
 func (s *DockerSuite) TestExecApiCreateNoCmd(c *check.C) {
 	name := "exec_test"
-	runCmd := exec.Command(dockerBinary, "run", "-d", "-t", "--name", name, "busybox", "/bin/sh")
-	if out, _, err := runCommandWithOutput(runCmd); err != nil {
-		c.Fatal(out, err)
-	}
+	dockerCmd(c, "run", "-d", "-t", "--name", name, "busybox", "/bin/sh")
 
 	status, body, err := sockRequest("POST", fmt.Sprintf("/containers/%s/exec", name), map[string]interface{}{"Cmd": nil})
 	c.Assert(status, check.Equals, http.StatusInternalServerError)

integration-cli/docker_api_images_test.go

@@ -4,7 +4,6 @@ import (
 	"encoding/json"
 	"net/http"
 	"net/url"
-	"os/exec"
 	"strings"
 
 	"github.com/docker/docker/api/types"
@@ -16,9 +15,7 @@ func (s *DockerSuite) TestApiImagesFilter(c *check.C) {
 	name2 := "utest/docker:tag2"
 	name3 := "utest:5000/docker:tag3"
 	for _, n := range []string{name, name2, name3} {
-		if out, err := exec.Command(dockerBinary, "tag", "busybox", n).CombinedOutput(); err != nil {
-			c.Fatal(err, out)
-		}
+		dockerCmd(c, "tag", "busybox", n)
 	}
 	type image types.Image
 	getImages := func(filter string) []image {
@@ -65,9 +62,7 @@ func (s *DockerSuite) TestApiImagesSaveAndLoad(c *check.C) {
 
 	defer body.Close()
 
-	if out, err := exec.Command(dockerBinary, "rmi", id).CombinedOutput(); err != nil {
-		c.Fatal(err, out)
-	}
+	dockerCmd(c, "rmi", id)
 
 	res, loadBody, err := sockRequestRaw("POST", "/images/load", body, "application/x-tar")
 	c.Assert(err, check.IsNil)
@@ -75,10 +70,7 @@ func (s *DockerSuite) TestApiImagesSaveAndLoad(c *check.C) {
 
 	defer loadBody.Close()
 
-	inspectOut, err := exec.Command(dockerBinary, "inspect", "--format='{{ .Id }}'", id).CombinedOutput()
-	if err != nil {
-		c.Fatal(err, inspectOut)
-	}
+	inspectOut, _ := dockerCmd(c, "inspect", "--format='{{ .Id }}'", id)
 	if strings.TrimSpace(string(inspectOut)) != id {
 		c.Fatal("load did not work properly")
 	}
@@ -93,9 +85,7 @@ func (s *DockerSuite) TestApiImagesDelete(c *check.C) {
 	}
 	id := strings.TrimSpace(out)
 
-	if out, err := exec.Command(dockerBinary, "tag", name, "test:tag1").CombinedOutput(); err != nil {
-		c.Fatal(err, out)
-	}
+	dockerCmd(c, "tag", name, "test:tag1")
 
 	status, _, err := sockRequest("DELETE", "/images/"+id, nil)
 	c.Assert(status, check.Equals, http.StatusConflict)

integration-cli/docker_api_inspect_test.go

@@ -3,18 +3,13 @@ package main
 import (
 	"encoding/json"
 	"net/http"
-	"os/exec"
 	"strings"
 
 	"github.com/go-check/check"
 )
 
 func (s *DockerSuite) TestInspectApiContainerResponse(c *check.C) {
-	runCmd := exec.Command(dockerBinary, "run", "-d", "busybox", "true")
-	out, _, err := runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatalf("failed to create a container: %s, %v", out, err)
-	}
+	out, _ := dockerCmd(c, "run", "-d", "busybox", "true")
 
 	cleanedContainerID := strings.TrimSpace(out)
 

integration-cli/docker_api_logs_test.go

@@ -5,7 +5,6 @@ import (
 	"bytes"
 	"fmt"
 	"net/http"
-	"os/exec"
 	"strings"
 	"time"
 
@@ -46,10 +45,7 @@ func (s *DockerSuite) TestLogsApiWithStdout(c *check.C) {
 
 func (s *DockerSuite) TestLogsApiNoStdoutNorStderr(c *check.C) {
 	name := "logs_test"
-	runCmd := exec.Command(dockerBinary, "run", "-d", "-t", "--name", name, "busybox", "/bin/sh")
-	if out, _, err := runCommandWithOutput(runCmd); err != nil {
-		c.Fatal(out, err)
-	}
+	dockerCmd(c, "run", "-d", "-t", "--name", name, "busybox", "/bin/sh")
 
 	status, body, err := sockRequest("GET", fmt.Sprintf("/containers/%s/logs", name), nil)
 	c.Assert(status, check.Equals, http.StatusBadRequest)
@@ -65,10 +61,7 @@ func (s *DockerSuite) TestLogsApiNoStdoutNorStderr(c *check.C) {
 func (s *DockerSuite) TestLogsApiFollowEmptyOutput(c *check.C) {
 	name := "logs_test"
 	t0 := time.Now()
-	runCmd := exec.Command(dockerBinary, "run", "-d", "-t", "--name", name, "busybox", "sleep", "10")
-	if out, _, err := runCommandWithOutput(runCmd); err != nil {
-		c.Fatal(out, err)
-	}
+	dockerCmd(c, "run", "-d", "-t", "--name", name, "busybox", "sleep", "10")
 
 	_, body, err := sockRequestRaw("GET", fmt.Sprintf("/containers/%s/logs?follow=1&stdout=1&stderr=1&tail=all", name), bytes.NewBuffer(nil), "")
 	t1 := time.Now()

integration-cli/docker_api_resize_test.go

@@ -2,18 +2,13 @@ package main
 
 import (
 	"net/http"
-	"os/exec"
 	"strings"
 
 	"github.com/go-check/check"
 )
 
 func (s *DockerSuite) TestResizeApiResponse(c *check.C) {
-	runCmd := exec.Command(dockerBinary, "run", "-d", "busybox", "top")
-	out, _, err := runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatalf(out, err)
-	}
+	out, _ := dockerCmd(c, "run", "-d", "busybox", "top")
 	cleanedContainerID := strings.TrimSpace(out)
 
 	endpoint := "/containers/" + cleanedContainerID + "/resize?h=40&w=40"
@@ -23,11 +18,7 @@ func (s *DockerSuite) TestResizeApiResponse(c *check.C) {
 }
 
 func (s *DockerSuite) TestResizeApiHeightWidthNoInt(c *check.C) {
-	runCmd := exec.Command(dockerBinary, "run", "-d", "busybox", "top")
-	out, _, err := runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatalf(out, err)
-	}
+	out, _ := dockerCmd(c, "run", "-d", "busybox", "top")
 	cleanedContainerID := strings.TrimSpace(out)
 
 	endpoint := "/containers/" + cleanedContainerID + "/resize?h=foo&w=bar"
@@ -37,19 +28,11 @@ func (s *DockerSuite) TestResizeApiHeightWidthNoInt(c *check.C) {
 }
 
 func (s *DockerSuite) TestResizeApiResponseWhenContainerNotStarted(c *check.C) {
-	runCmd := exec.Command(dockerBinary, "run", "-d", "busybox", "true")
-	out, _, err := runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatalf(out, err)
-	}
+	out, _ := dockerCmd(c, "run", "-d", "busybox", "true")
 	cleanedContainerID := strings.TrimSpace(out)
 
 	// make sure the exited container is not running
-	runCmd = exec.Command(dockerBinary, "wait", cleanedContainerID)
-	out, _, err = runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatalf(out, err)
-	}
+	dockerCmd(c, "wait", cleanedContainerID)
 
 	endpoint := "/containers/" + cleanedContainerID + "/resize?h=40&w=40"
 	status, body, err := sockRequest("POST", endpoint, nil)

integration-cli/docker_cli_attach_test.go

@@ -76,10 +76,7 @@ func (s *DockerSuite) TestAttachMultipleAndRestart(c *check.C) {
 		c.Fatalf("Attaches did not initialize properly")
 	}
 
-	cmd := exec.Command(dockerBinary, "kill", "attacher")
-	if _, err := runCommand(cmd); err != nil {
-		c.Fatal(err)
-	}
+	dockerCmd(c, "kill", "attacher")
 
 	select {
 	case <-endDone:
@@ -90,11 +87,7 @@ func (s *DockerSuite) TestAttachMultipleAndRestart(c *check.C) {
 }
 
 func (s *DockerSuite) TestAttachTtyWithoutStdin(c *check.C) {
-	cmd := exec.Command(dockerBinary, "run", "-d", "-ti", "busybox")
-	out, _, err := runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatalf("failed to start container: %v (%v)", out, err)
-	}
+	out, _ := dockerCmd(c, "run", "-d", "-ti", "busybox")
 
 	id := strings.TrimSpace(out)
 	if err := waitRun(id); err != nil {

integration-cli/docker_cli_attach_unix_test.go

@@ -16,11 +16,7 @@ import (
 // #9860
 func (s *DockerSuite) TestAttachClosedOnContainerStop(c *check.C) {
 
-	cmd := exec.Command(dockerBinary, "run", "-dti", "busybox", "sleep", "2")
-	out, _, err := runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatalf("failed to start container: %v (%v)", out, err)
-	}
+	out, _ := dockerCmd(c, "run", "-dti", "busybox", "sleep", "2")
 
 	id := strings.TrimSpace(out)
 	if err := waitRun(id); err != nil {
@@ -47,10 +43,8 @@ func (s *DockerSuite) TestAttachClosedOnContainerStop(c *check.C) {
 		}
 	}()
 
-	waitCmd := exec.Command(dockerBinary, "wait", id)
-	if out, _, err = runCommandWithOutput(waitCmd); err != nil {
-		c.Fatalf("error thrown while waiting for container: %s, %v", out, err)
-	}
+	dockerCmd(c, "wait", id)
+
 	select {
 	case err := <-errChan:
 		c.Assert(err, check.IsNil)

integration-cli/docker_cli_build_test.go

@@ -76,16 +76,7 @@ func (s *DockerSuite) TestBuildShCmdJSONEntrypoint(c *check.C) {
 		c.Fatal(err)
 	}
 
-	out, _, err := runCommandWithOutput(
-		exec.Command(
-			dockerBinary,
-			"run",
-			"--rm",
-			name))
-
-	if err != nil {
-		c.Fatal(err)
-	}
+	out, _ := dockerCmd(c, "run", "--rm", name)
 
 	if strings.TrimSpace(out) != "/bin/sh -c echo test" {
 		c.Fatal("CMD did not contain /bin/sh -c")
@@ -420,12 +411,12 @@ func (s *DockerSuite) TestBuildEnvEscapes(c *check.C) {
     `,
 		true)
 
-	out, _, err := runCommandWithOutput(exec.Command(dockerBinary, "run", "-t", name))
-
 	if err != nil {
 		c.Fatal(err)
 	}
 
+	out, _ := dockerCmd(c, "run", "-t", name)
+
 	if strings.TrimSpace(out) != "$" {
 		c.Fatalf("Env TEST was not overwritten with bar when foo was supplied to dockerfile: was %q", strings.TrimSpace(out))
 	}
@@ -447,11 +438,7 @@ func (s *DockerSuite) TestBuildEnvOverwrite(c *check.C) {
 		c.Fatal(err)
 	}
 
-	out, _, err := runCommandWithOutput(exec.Command(dockerBinary, "run", "-e", "TEST=bar", "-t", name))
-
-	if err != nil {
-		c.Fatal(err)
-	}
+	out, _ := dockerCmd(c, "run", "-e", "TEST=bar", "-t", name)
 
 	if strings.TrimSpace(out) != "bar" {
 		c.Fatalf("Env TEST was not overwritten with bar when foo was supplied to dockerfile: was %q", strings.TrimSpace(out))
@@ -462,21 +449,13 @@ func (s *DockerSuite) TestBuildEnvOverwrite(c *check.C) {
 func (s *DockerSuite) TestBuildOnBuildForbiddenMaintainerInSourceImage(c *check.C) {
 	name := "testbuildonbuildforbiddenmaintainerinsourceimage"
 
-	createCmd := exec.Command(dockerBinary, "create", "busybox", "true")
-	out, _, _, err := runCommandWithStdoutStderr(createCmd)
-	if err != nil {
-		c.Fatal(out, err)
-	}
+	out, _ := dockerCmd(c, "create", "busybox", "true")
 
 	cleanedContainerID := strings.TrimSpace(out)
 
-	commitCmd := exec.Command(dockerBinary, "commit", "--run", "{\"OnBuild\":[\"MAINTAINER docker.io\"]}", cleanedContainerID, "onbuild")
-
-	if _, err := runCommand(commitCmd); err != nil {
-		c.Fatal(err)
-	}
+	dockerCmd(c, "commit", "--run", "{\"OnBuild\":[\"MAINTAINER docker.io\"]}", cleanedContainerID, "onbuild")
 
-	_, err = buildImage(name,
+	_, err := buildImage(name,
 		`FROM onbuild`,
 		true)
 	if err != nil {
@@ -492,21 +471,13 @@ func (s *DockerSuite) TestBuildOnBuildForbiddenMaintainerInSourceImage(c *check.
 func (s *DockerSuite) TestBuildOnBuildForbiddenFromInSourceImage(c *check.C) {
 	name := "testbuildonbuildforbiddenfrominsourceimage"
 
-	createCmd := exec.Command(dockerBinary, "create", "busybox", "true")
-	out, _, _, err := runCommandWithStdoutStderr(createCmd)
-	if err != nil {
-		c.Fatal(out, err)
-	}
+	out, _ := dockerCmd(c, "create", "busybox", "true")
 
 	cleanedContainerID := strings.TrimSpace(out)
 
-	commitCmd := exec.Command(dockerBinary, "commit", "--run", "{\"OnBuild\":[\"FROM busybox\"]}", cleanedContainerID, "onbuild")
+	dockerCmd(c, "commit", "--run", "{\"OnBuild\":[\"FROM busybox\"]}", cleanedContainerID, "onbuild")
 
-	if _, err := runCommand(commitCmd); err != nil {
-		c.Fatal(err)
-	}
-
-	_, err = buildImage(name,
+	_, err := buildImage(name,
 		`FROM onbuild`,
 		true)
 	if err != nil {
@@ -522,21 +493,13 @@ func (s *DockerSuite) TestBuildOnBuildForbiddenFromInSourceImage(c *check.C) {
 func (s *DockerSuite) TestBuildOnBuildForbiddenChainedInSourceImage(c *check.C) {
 	name := "testbuildonbuildforbiddenchainedinsourceimage"
 
-	createCmd := exec.Command(dockerBinary, "create", "busybox", "true")
-	out, _, _, err := runCommandWithStdoutStderr(createCmd)
-	if err != nil {
-		c.Fatal(out, err)
-	}
+	out, _ := dockerCmd(c, "create", "busybox", "true")
 
 	cleanedContainerID := strings.TrimSpace(out)
 
-	commitCmd := exec.Command(dockerBinary, "commit", "--run", "{\"OnBuild\":[\"ONBUILD RUN ls\"]}", cleanedContainerID, "onbuild")
-
-	if _, err := runCommand(commitCmd); err != nil {
-		c.Fatal(err)
-	}
+	dockerCmd(c, "commit", "--run", "{\"OnBuild\":[\"ONBUILD RUN ls\"]}", cleanedContainerID, "onbuild")
 
-	_, err = buildImage(name,
+	_, err := buildImage(name,
 		`FROM onbuild`,
 		true)
 	if err != nil {
@@ -570,10 +533,7 @@ ONBUILD RUN ["true"]`,
 		c.Fatal(err)
 	}
 
-	out, _, err := runCommandWithOutput(exec.Command(dockerBinary, "run", "-t", name2))
-	if err != nil {
-		c.Fatal(err)
-	}
+	out, _ := dockerCmd(c, "run", "-t", name2)
 
 	if !regexp.MustCompile(`(?m)^hello world`).MatchString(out) {
 		c.Fatal("did not get echo output from onbuild", out)
@@ -600,10 +560,7 @@ ONBUILD ENTRYPOINT ["echo"]`,
 		c.Fatal(err)
 	}
 
-	out, _, err := runCommandWithOutput(exec.Command(dockerBinary, "run", "-t", name2))
-	if err != nil {
-		c.Fatal(err)
-	}
+	out, _ := dockerCmd(c, "run", "-t", name2)
 
 	if !regexp.MustCompile(`(?m)^hello world`).MatchString(out) {
 		c.Fatal("got malformed output from onbuild", out)
@@ -1827,11 +1784,7 @@ func (s *DockerSuite) TestBuildForceRm(c *check.C) {
 	}
 	defer ctx.Close()
 
-	buildCmd := exec.Command(dockerBinary, "build", "-t", name, "--force-rm", ".")
-	buildCmd.Dir = ctx.Dir
-	if out, _, err := runCommandWithOutput(buildCmd); err == nil {
-		c.Fatalf("failed to build the image: %s, %v", out, err)
-	}
+	dockerCmdInDir(c, ctx.Dir, "build", "-t", name, "--force-rm", ".")
 
 	containerCountAfter, err := getContainerCount()
 	if err != nil {
@@ -3100,11 +3053,7 @@ func (s *DockerSuite) TestBuildWithVolumeOwnership(c *check.C) {
 		c.Fatal(err)
 	}
 
-	cmd := exec.Command(dockerBinary, "run", "--rm", "testbuildimg", "ls", "-la", "/test")
-	out, _, err := runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatal(out, err)
-	}
+	out, _ := dockerCmd(c, "run", "--rm", "testbuildimg", "ls", "-la", "/test")
 
 	if expected := "drw-------"; !strings.Contains(out, expected) {
 		c.Fatalf("expected %s received %s", expected, out)
@@ -3349,6 +3298,9 @@ func (s *DockerSuite) TestBuildEscapeWhitespace(c *check.C) {
 IO <io@\
 docker.com>"
   `, true)
+	if err != nil {
+		c.Fatal(err)
+	}
 
 	res, err := inspectField(name, "Author")
 
@@ -3371,11 +3323,12 @@ func (s *DockerSuite) TestBuildVerifyIntString(c *check.C) {
   MAINTAINER 123
   `, true)
 
-	out, rc, err := runCommandWithOutput(exec.Command(dockerBinary, "inspect", name))
-	if rc != 0 || err != nil {
-		c.Fatalf("Unexpected error from inspect: rc: %v  err: %v", rc, err)
+	if err != nil {
+		c.Fatal(err)
 	}
 
+	out, _ := dockerCmd(c, "inspect", name)
+
 	if !strings.Contains(out, "\"123\"") {
 		c.Fatalf("Output does not contain the int as a string:\n%s", out)
 	}
@@ -4030,6 +3983,7 @@ func (s *DockerSuite) TestBuildAddTarXz(c *check.C) {
 		if err := tw.Close(); err != nil {
 			c.Fatalf("failed to close tar archive: %v", err)
 		}
+
 		xzCompressCmd := exec.Command("xz", "-k", "test.tar")
 		xzCompressCmd.Dir = tmpDir
 		out, _, err := runCommandWithOutput(xzCompressCmd)
@@ -4389,9 +4343,7 @@ func (s *DockerSuite) TestBuildEntrypointInheritance(c *check.C) {
 		c.Fatal(err)
 	}
 
-	status, _ := runCommand(exec.Command(dockerBinary, "run", "parent"))
-
-	if status != 130 {
+	if _, status, _ := dockerCmdWithError(c, "run", "parent"); status != 130 {
 		c.Fatalf("expected exit code 130 but received %d", status)
 	}
 
@@ -4402,9 +4354,7 @@ func (s *DockerSuite) TestBuildEntrypointInheritance(c *check.C) {
 		c.Fatal(err)
 	}
 
-	status, _ = runCommand(exec.Command(dockerBinary, "run", "child"))
-
-	if status != 5 {
+	if _, status, _ := dockerCmdWithError(c, "run", "child"); status != 5 {
 		c.Fatalf("expected exit code 5 but received %d", status)
 	}
 
@@ -4434,10 +4384,7 @@ func (s *DockerSuite) TestBuildEntrypointInheritanceInspect(c *check.C) {
 		c.Fatalf("Expected value %s not in Config.Entrypoint: %s", expected, res)
 	}
 
-	out, _, err := runCommandWithOutput(exec.Command(dockerBinary, "run", "-t", name2))
-	if err != nil {
-		c.Fatal(err, out)
-	}
+	out, _ := dockerCmd(c, "run", "-t", name2)
 
 	expected = "quux"
 
@@ -4457,12 +4404,7 @@ func (s *DockerSuite) TestBuildRunShEntrypoint(c *check.C) {
 		c.Fatal(err)
 	}
 
-	out, _, err := runCommandWithOutput(exec.Command(dockerBinary, "run", "--rm", name))
-
-	if err != nil {
-		c.Fatal(err, out)
-	}
-
+	dockerCmd(c, "run", "--rm", name)
 }
 
 func (s *DockerSuite) TestBuildExoticShellInterpolation(c *check.C) {
@@ -4501,13 +4443,14 @@ func (s *DockerSuite) TestBuildVerifySingleQuoteFails(c *check.C) {
 	// it should barf on it.
 	name := "testbuildsinglequotefails"
 
-	_, err := buildImage(name,
+	if _, err := buildImage(name,
 		`FROM busybox
 		CMD [ '/bin/sh', '-c', 'echo hi' ]`,
-		true)
-	_, _, err = runCommandWithOutput(exec.Command(dockerBinary, "run", "--rm", name))
+		true); err != nil {
+		c.Fatal(err)
+	}
 
-	if err == nil {
+	if _, _, err := dockerCmdWithError(c, "run", "--rm", name); err == nil {
 		c.Fatal("The image was not supposed to be able to run")
 	}
 
@@ -4771,10 +4714,7 @@ CMD cat /foo/file`,
 		c.Fatal(err)
 	}
 
-	out, _, err := runCommandWithOutput(exec.Command(dockerBinary, "run", "--rm", name))
-	if err != nil {
-		c.Fatal(err)
-	}
+	out, _ := dockerCmd(c, "run", "--rm", name)
 	if out != expected {
 		c.Fatalf("expected file contents for /foo/file to be %q but received %q", expected, out)
 	}
@@ -5056,7 +4996,7 @@ func (s *DockerSuite) TestBuildDockerfileOutsideContext(c *check.C) {
 		filepath.Join(ctx, "dockerfile1"),
 		filepath.Join(ctx, "dockerfile2"),
 	} {
-		out, _, err := runCommandWithOutput(exec.Command(dockerBinary, "build", "-t", name, "--no-cache", "-f", dockerfilePath, "."))
+		out, _, err := dockerCmdWithError(c, "build", "-t", name, "--no-cache", "-f", dockerfilePath, ".")
 		if err == nil {
 			c.Fatalf("Expected error with %s. Out: %s", dockerfilePath, out)
 		}
@@ -5070,7 +5010,7 @@ func (s *DockerSuite) TestBuildDockerfileOutsideContext(c *check.C) {
 
 	// Path to Dockerfile should be resolved relative to working directory, not relative to context.
 	// There is a Dockerfile in the context, but since there is no Dockerfile in the current directory, the following should fail
-	out, _, err := runCommandWithOutput(exec.Command(dockerBinary, "build", "-t", name, "--no-cache", "-f", "Dockerfile", ctx))
+	out, _, err := dockerCmdWithError(c, "build", "-t", name, "--no-cache", "-f", "Dockerfile", ctx)
 	if err == nil {
 		c.Fatalf("Expected error. Out: %s", out)
 	}
@@ -5257,9 +5197,7 @@ func (s *DockerSuite) TestBuildNotVerbose(c *check.C) {
 	defer ctx.Close()
 
 	// First do it w/verbose - baseline
-	buildCmd := exec.Command(dockerBinary, "build", "--no-cache", "-t", "verbose", ".")
-	buildCmd.Dir = ctx.Dir
-	out, _, err := runCommandWithOutput(buildCmd)
+	out, _, err := dockerCmdInDir(c, ctx.Dir, "build", "--no-cache", "-t", "verbose", ".")
 	if err != nil {
 		c.Fatalf("failed to build the image w/o -q: %s, %v", out, err)
 	}
@@ -5268,9 +5206,7 @@ func (s *DockerSuite) TestBuildNotVerbose(c *check.C) {
 	}
 
 	// Now do it w/o verbose
-	buildCmd = exec.Command(dockerBinary, "build", "--no-cache", "-q", "-t", "verbose", ".")
-	buildCmd.Dir = ctx.Dir
-	out, _, err = runCommandWithOutput(buildCmd)
+	out, _, err = dockerCmdInDir(c, ctx.Dir, "build", "--no-cache", "-q", "-t", "verbose", ".")
 	if err != nil {
 		c.Fatalf("failed to build the image w/ -q: %s, %v", out, err)
 	}
@@ -5290,9 +5226,7 @@ RUN [ "/hello" ]`, map[string]string{})
 	}
 	defer ctx.Close()
 
-	buildCmd := exec.Command(dockerBinary, "build", "--no-cache", "-t", name, ".")
-	buildCmd.Dir = ctx.Dir
-	out, _, err := runCommandWithOutput(buildCmd)
+	out, _, err := dockerCmdInDir(c, ctx.Dir, "build", "--no-cache", "-t", name, ".")
 	if err != nil {
 		c.Fatalf("failed to build the image: %s, %v", out, err)
 	}

integration-cli/docker_cli_build_unix_test.go

@@ -4,7 +4,6 @@ package main
 
 import (
 	"encoding/json"
-	"os/exec"
 	"strings"
 
 	"github.com/go-check/check"
@@ -22,14 +21,9 @@ func (s *DockerSuite) TestBuildResourceConstraintsAreUsed(c *check.C) {
 		c.Fatal(err)
 	}
 
-	cmd := exec.Command(dockerBinary, "build", "--no-cache", "--rm=false", "--memory=64m", "--memory-swap=-1", "--cpuset-cpus=0", "--cpuset-mems=0", "--cpu-shares=100", "--cpu-quota=8000", "-t", name, ".")
-	cmd.Dir = ctx.Dir
+	dockerCmdInDir(c, ctx.Dir, "build", "--no-cache", "--rm=false", "--memory=64m", "--memory-swap=-1", "--cpuset-cpus=0", "--cpuset-mems=0", "--cpu-shares=100", "--cpu-quota=8000", "-t", name, ".")
 
-	out, _, err := runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatal(err, out)
-	}
-	out, _ = dockerCmd(c, "ps", "-lq")
+	out, _ := dockerCmd(c, "ps", "-lq")
 
 	cID := strings.TrimSpace(out)
 
@@ -57,7 +51,7 @@ func (s *DockerSuite) TestBuildResourceConstraintsAreUsed(c *check.C) {
 	}
 
 	// Make sure constraints aren't saved to image
-	_, _ = dockerCmd(c, "run", "--name=test", name)
+	dockerCmd(c, "run", "--name=test", name)
 
 	cfg, err = inspectFieldJSON("test", "HostConfig")
 	if err != nil {

integration-cli/docker_cli_by_digest_test.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"fmt"
-	"os/exec"
 	"regexp"
 	"strings"
 
@@ -15,22 +14,18 @@ var (
 	digestRegex = regexp.MustCompile("Digest: ([^\n]+)")
 )
 
-func setupImage() (string, error) {
-	return setupImageWithTag("latest")
+func setupImage(c *check.C) (string, error) {
+	return setupImageWithTag(c, "latest")
 }
 
-func setupImageWithTag(tag string) (string, error) {
+func setupImageWithTag(c *check.C, tag string) (string, error) {
 	containerName := "busyboxbydigest"
 
-	cmd := exec.Command(dockerBinary, "run", "-d", "-e", "digest=1", "--name", containerName, "busybox")
-	if _, err := runCommand(cmd); err != nil {
-		return "", err
-	}
+	dockerCmd(c, "run", "-d", "-e", "digest=1", "--name", containerName, "busybox")
 
 	// tag the image to upload it to the private registry
 	repoAndTag := utils.ImageReference(repoName, tag)
-	cmd = exec.Command(dockerBinary, "commit", containerName, repoAndTag)
-	if out, _, err := runCommandWithOutput(cmd); err != nil {
+	if out, _, err := dockerCmdWithError(c, "commit", containerName, repoAndTag); err != nil {
 		return "", fmt.Errorf("image tagging failed: %s, %v", out, err)
 	}
 
@@ -40,16 +35,14 @@ func setupImageWithTag(tag string) (string, error) {
 	}
 
 	// push the image
-	cmd = exec.Command(dockerBinary, "push", repoAndTag)
-	out, _, err := runCommandWithOutput(cmd)
+	out, _, err := dockerCmdWithError(c, "push", repoAndTag)
 	if err != nil {
 		return "", fmt.Errorf("pushing the image to the private registry has failed: %s, %v", out, err)
 	}
 
 	// delete our local repo that we previously tagged
-	cmd = exec.Command(dockerBinary, "rmi", repoAndTag)
-	if out, _, err := runCommandWithOutput(cmd); err != nil {
-		return "", fmt.Errorf("error deleting images prior to real test: %s, %v", out, err)
+	if rmiout, _, err := dockerCmdWithError(c, "rmi", repoAndTag); err != nil {
+		return "", fmt.Errorf("error deleting images prior to real test: %s, %v", rmiout, err)
 	}
 
 	// the push output includes "Digest: <digest>", so find that
@@ -63,17 +56,13 @@ func setupImageWithTag(tag string) (string, error) {
 }
 
 func (s *DockerRegistrySuite) TestPullByTagDisplaysDigest(c *check.C) {
-	pushDigest, err := setupImage()
+	pushDigest, err := setupImage(c)
 	if err != nil {
 		c.Fatalf("error setting up image: %v", err)
 	}
 
 	// pull from the registry using the tag
-	cmd := exec.Command(dockerBinary, "pull", repoName)
-	out, _, err := runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatalf("error pulling by tag: %s, %v", out, err)
-	}
+	out, _ := dockerCmd(c, "pull", repoName)
 
 	// the pull output includes "Digest: <digest>", so find that
 	matches := digestRegex.FindStringSubmatch(out)
@@ -89,18 +78,14 @@ func (s *DockerRegistrySuite) TestPullByTagDisplaysDigest(c *check.C) {
 }
 
 func (s *DockerRegistrySuite) TestPullByDigest(c *check.C) {
-	pushDigest, err := setupImage()
+	pushDigest, err := setupImage(c)
 	if err != nil {
 		c.Fatalf("error setting up image: %v", err)
 	}
 
 	// pull from the registry using the <name>@<digest> reference
 	imageReference := fmt.Sprintf("%s@%s", repoName, pushDigest)
-	cmd := exec.Command(dockerBinary, "pull", imageReference)
-	out, _, err := runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatalf("error pulling by digest: %s, %v", out, err)
-	}
+	out, _ := dockerCmd(c, "pull", imageReference)
 
 	// the pull output includes "Digest: <digest>", so find that
 	matches := digestRegex.FindStringSubmatch(out)
@@ -118,15 +103,14 @@ func (s *DockerRegistrySuite) TestPullByDigest(c *check.C) {
 func (s *DockerRegistrySuite) TestPullByDigestNoFallback(c *check.C) {
 	// pull from the registry using the <name>@<digest> reference
 	imageReference := fmt.Sprintf("%s@sha256:ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", repoName)
-	cmd := exec.Command(dockerBinary, "pull", imageReference)
-	out, _, err := runCommandWithOutput(cmd)
+	out, _, err := dockerCmdWithError(c, "pull", imageReference)
 	if err == nil || !strings.Contains(out, "pulling with digest reference failed from v2 registry") {
 		c.Fatalf("expected non-zero exit status and correct error message when pulling non-existing image: %s", out)
 	}
 }
 
 func (s *DockerRegistrySuite) TestCreateByDigest(c *check.C) {
-	pushDigest, err := setupImage()
+	pushDigest, err := setupImage(c)
 	if err != nil {
 		c.Fatalf("error setting up image: %v", err)
 	}
@@ -134,11 +118,7 @@ func (s *DockerRegistrySuite) TestCreateByDigest(c *check.C) {
 	imageReference := fmt.Sprintf("%s@%s", repoName, pushDigest)
 
 	containerName := "createByDigest"
-	cmd := exec.Command(dockerBinary, "create", "--name", containerName, imageReference)
-	out, _, err := runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatalf("error creating by digest: %s, %v", out, err)
-	}
+	out, _ := dockerCmd(c, "create", "--name", containerName, imageReference)
 
 	res, err := inspectField(containerName, "Config.Image")
 	if err != nil {
@@ -150,7 +130,7 @@ func (s *DockerRegistrySuite) TestCreateByDigest(c *check.C) {
 }
 
 func (s *DockerRegistrySuite) TestRunByDigest(c *check.C) {
-	pushDigest, err := setupImage()
+	pushDigest, err := setupImage(c)
 	if err != nil {
 		c.Fatalf("error setting up image: %v", err)
 	}
@@ -158,11 +138,7 @@ func (s *DockerRegistrySuite) TestRunByDigest(c *check.C) {
 	imageReference := fmt.Sprintf("%s@%s", repoName, pushDigest)
 
 	containerName := "runByDigest"
-	cmd := exec.Command(dockerBinary, "run", "--name", containerName, imageReference, "sh", "-c", "echo found=$digest")
-	out, _, err := runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatalf("error run by digest: %s, %v", out, err)
-	}
+	out, _ := dockerCmd(c, "run", "--name", containerName, imageReference, "sh", "-c", "echo found=$digest")
 
 	foundRegex := regexp.MustCompile("found=([^\n]+)")
 	matches := foundRegex.FindStringSubmatch(out)
@@ -183,7 +159,7 @@ func (s *DockerRegistrySuite) TestRunByDigest(c *check.C) {
 }
 
 func (s *DockerRegistrySuite) TestRemoveImageByDigest(c *check.C) {
-	digest, err := setupImage()
+	digest, err := setupImage(c)
 	if err != nil {
 		c.Fatalf("error setting up image: %v", err)
 	}
@@ -191,11 +167,7 @@ func (s *DockerRegistrySuite) TestRemoveImageByDigest(c *check.C) {
 	imageReference := fmt.Sprintf("%s@%s", repoName, digest)
 
 	// pull from the registry using the <name>@<digest> reference
-	cmd := exec.Command(dockerBinary, "pull", imageReference)
-	out, _, err := runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatalf("error pulling by digest: %s, %v", out, err)
-	}
+	dockerCmd(c, "pull", imageReference)
 
 	// make sure inspect runs ok
 	if _, err := inspectField(imageReference, "Id"); err != nil {
@@ -216,7 +188,7 @@ func (s *DockerRegistrySuite) TestRemoveImageByDigest(c *check.C) {
 }
 
 func (s *DockerRegistrySuite) TestBuildByDigest(c *check.C) {
-	digest, err := setupImage()
+	digest, err := setupImage(c)
 	if err != nil {
 		c.Fatalf("error setting up image: %v", err)
 	}
@@ -224,11 +196,7 @@ func (s *DockerRegistrySuite) TestBuildByDigest(c *check.C) {
 	imageReference := fmt.Sprintf("%s@%s", repoName, digest)
 
 	// pull from the registry using the <name>@<digest> reference
-	cmd := exec.Command(dockerBinary, "pull", imageReference)
-	out, _, err := runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatalf("error pulling by digest: %s, %v", out, err)
-	}
+	dockerCmd(c, "pull", imageReference)
 
 	// get the image id
 	imageID, err := inspectField(imageReference, "Id")
@@ -258,7 +226,7 @@ func (s *DockerRegistrySuite) TestBuildByDigest(c *check.C) {
 }
 
 func (s *DockerRegistrySuite) TestTagByDigest(c *check.C) {
-	digest, err := setupImage()
+	digest, err := setupImage(c)
 	if err != nil {
 		c.Fatalf("error setting up image: %v", err)
 	}
@@ -266,18 +234,11 @@ func (s *DockerRegistrySuite) TestTagByDigest(c *check.C) {
 	imageReference := fmt.Sprintf("%s@%s", repoName, digest)
 
 	// pull from the registry using the <name>@<digest> reference
-	cmd := exec.Command(dockerBinary, "pull", imageReference)
-	out, _, err := runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatalf("error pulling by digest: %s, %v", out, err)
-	}
+	dockerCmd(c, "pull", imageReference)
 
 	// tag it
 	tag := "tagbydigest"
-	cmd = exec.Command(dockerBinary, "tag", imageReference, tag)
-	if _, err := runCommand(cmd); err != nil {
-		c.Fatalf("unexpected error tagging: %v", err)
-	}
+	dockerCmd(c, "tag", imageReference, tag)
 
 	expectedID, err := inspectField(imageReference, "Id")
 	if err != nil {
@@ -295,7 +256,7 @@ func (s *DockerRegistrySuite) TestTagByDigest(c *check.C) {
 }
 
 func (s *DockerRegistrySuite) TestListImagesWithoutDigests(c *check.C) {
-	digest, err := setupImage()
+	digest, err := setupImage(c)
 	if err != nil {
 		c.Fatalf("error setting up image: %v", err)
 	}
@@ -303,17 +264,9 @@ func (s *DockerRegistrySuite) TestListImagesWithoutDigests(c *check.C) {
 	imageReference := fmt.Sprintf("%s@%s", repoName, digest)
 
 	// pull from the registry using the <name>@<digest> reference
-	cmd := exec.Command(dockerBinary, "pull", imageReference)
-	out, _, err := runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatalf("error pulling by digest: %s, %v", out, err)
-	}
+	dockerCmd(c, "pull", imageReference)
 
-	cmd = exec.Command(dockerBinary, "images")
-	out, _, err = runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatalf("error listing images: %s, %v", out, err)
-	}
+	out, _ := dockerCmd(c, "images")
 
 	if strings.Contains(out, "DIGEST") {
 		c.Fatalf("list output should not have contained DIGEST header: %s", out)
@@ -324,7 +277,7 @@ func (s *DockerRegistrySuite) TestListImagesWithoutDigests(c *check.C) {
 func (s *DockerRegistrySuite) TestListImagesWithDigests(c *check.C) {
 
 	// setup image1
-	digest1, err := setupImageWithTag("tag1")
+	digest1, err := setupImageWithTag(c, "tag1")
 	if err != nil {
 		c.Fatalf("error setting up image: %v", err)
 	}
@@ -332,18 +285,10 @@ func (s *DockerRegistrySuite) TestListImagesWithDigests(c *check.C) {
 	c.Logf("imageReference1 = %s", imageReference1)
 
 	// pull image1 by digest
-	cmd := exec.Command(dockerBinary, "pull", imageReference1)
-	out, _, err := runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatalf("error pulling by digest: %s, %v", out, err)
-	}
+	dockerCmd(c, "pull", imageReference1)
 
 	// list images
-	cmd = exec.Command(dockerBinary, "images", "--digests")
-	out, _, err = runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatalf("error listing images: %s, %v", out, err)
-	}
+	out, _ := dockerCmd(c, "images", "--digests")
 
 	// make sure repo shown, tag=<none>, digest = $digest1
 	re1 := regexp.MustCompile(`\s*` + repoName + `\s*<none>\s*` + digest1 + `\s`)
@@ -352,7 +297,7 @@ func (s *DockerRegistrySuite) TestListImagesWithDigests(c *check.C) {
 	}
 
 	// setup image2
-	digest2, err := setupImageWithTag("tag2")
+	digest2, err := setupImageWithTag(c, "tag2")
 	if err != nil {
 		c.Fatalf("error setting up image: %v", err)
 	}
@@ -360,25 +305,13 @@ func (s *DockerRegistrySuite) TestListImagesWithDigests(c *check.C) {
 	c.Logf("imageReference2 = %s", imageReference2)
 
 	// pull image1 by digest
-	cmd = exec.Command(dockerBinary, "pull", imageReference1)
-	out, _, err = runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatalf("error pulling by digest: %s, %v", out, err)
-	}
+	dockerCmd(c, "pull", imageReference1)
 
 	// pull image2 by digest
-	cmd = exec.Command(dockerBinary, "pull", imageReference2)
-	out, _, err = runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatalf("error pulling by digest: %s, %v", out, err)
-	}
+	dockerCmd(c, "pull", imageReference2)
 
 	// list images
-	cmd = exec.Command(dockerBinary, "images", "--digests")
-	out, _, err = runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatalf("error listing images: %s, %v", out, err)
-	}
+	out, _ = dockerCmd(c, "images", "--digests")
 
 	// make sure repo shown, tag=<none>, digest = $digest1
 	if !re1.MatchString(out) {
@@ -392,18 +325,10 @@ func (s *DockerRegistrySuite) TestListImagesWithDigests(c *check.C) {
 	}
 
 	// pull tag1
-	cmd = exec.Command(dockerBinary, "pull", repoName+":tag1")
-	out, _, err = runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatalf("error pulling tag1: %s, %v", out, err)
-	}
+	dockerCmd(c, "pull", repoName+":tag1")
 
 	// list images
-	cmd = exec.Command(dockerBinary, "images", "--digests")
-	out, _, err = runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatalf("error listing images: %s, %v", out, err)
-	}
+	out, _ = dockerCmd(c, "images", "--digests")
 
 	// make sure image 1 has repo, tag, <none> AND repo, <none>, digest
 	reWithTag1 := regexp.MustCompile(`\s*` + repoName + `\s*tag1\s*<none>\s`)
@@ -420,18 +345,10 @@ func (s *DockerRegistrySuite) TestListImagesWithDigests(c *check.C) {
 	}
 
 	// pull tag 2
-	cmd = exec.Command(dockerBinary, "pull", repoName+":tag2")
-	out, _, err = runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatalf("error pulling tag2: %s, %v", out, err)
-	}
+	dockerCmd(c, "pull", repoName+":tag2")
 
 	// list images
-	cmd = exec.Command(dockerBinary, "images", "--digests")
-	out, _, err = runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatalf("error listing images: %s, %v", out, err)
-	}
+	out, _ = dockerCmd(c, "images", "--digests")
 
 	// make sure image 1 has repo, tag, digest
 	if !reWithTag1.MatchString(out) {
@@ -449,11 +366,7 @@ func (s *DockerRegistrySuite) TestListImagesWithDigests(c *check.C) {
 	}
 
 	// list images
-	cmd = exec.Command(dockerBinary, "images", "--digests")
-	out, _, err = runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatalf("error listing images: %s, %v", out, err)
-	}
+	out, _ = dockerCmd(c, "images", "--digests")
 
 	// make sure image 1 has repo, tag, digest
 	if !reWithTag1.MatchString(out) {
@@ -471,18 +384,14 @@ func (s *DockerRegistrySuite) TestListImagesWithDigests(c *check.C) {
 }
 
 func (s *DockerRegistrySuite) TestDeleteImageByIDOnlyPulledByDigest(c *check.C) {
-	pushDigest, err := setupImage()
+	pushDigest, err := setupImage(c)
 	if err != nil {
 		c.Fatalf("error setting up image: %v", err)
 	}
 
 	// pull from the registry using the <name>@<digest> reference
 	imageReference := fmt.Sprintf("%s@%s", repoName, pushDigest)
-	cmd := exec.Command(dockerBinary, "pull", imageReference)
-	out, _, err := runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatalf("error pulling by digest: %s, %v", out, err)
-	}
+	dockerCmd(c, "pull", imageReference)
 	// just in case...
 
 	imageID, err := inspectField(imageReference, "Id")
@@ -490,8 +399,5 @@ func (s *DockerRegistrySuite) TestDeleteImageByIDOnlyPulledByDigest(c *check.C)
 		c.Fatalf("error inspecting image id: %v", err)
 	}
 
-	cmd = exec.Command(dockerBinary, "rmi", imageID)
-	if _, err := runCommand(cmd); err != nil {
-		c.Fatalf("error deleting image by id: %v", err)
-	}
+	dockerCmd(c, "rmi", imageID)
 }

integration-cli/docker_cli_commit_test.go

@@ -1,91 +1,51 @@
 package main
 
 import (
-	"os/exec"
 	"strings"
 
 	"github.com/go-check/check"
 )
 
 func (s *DockerSuite) TestCommitAfterContainerIsDone(c *check.C) {
-	runCmd := exec.Command(dockerBinary, "run", "-i", "-a", "stdin", "busybox", "echo", "foo")
-	out, _, _, err := runCommandWithStdoutStderr(runCmd)
-	if err != nil {
-		c.Fatalf("failed to run container: %s, %v", out, err)
-	}
+	out, _ := dockerCmd(c, "run", "-i", "-a", "stdin", "busybox", "echo", "foo")
 
 	cleanedContainerID := strings.TrimSpace(out)
 
-	waitCmd := exec.Command(dockerBinary, "wait", cleanedContainerID)
-	if _, _, err = runCommandWithOutput(waitCmd); err != nil {
-		c.Fatalf("error thrown while waiting for container: %s, %v", out, err)
-	}
+	dockerCmd(c, "wait", cleanedContainerID)
 
-	commitCmd := exec.Command(dockerBinary, "commit", cleanedContainerID)
-	out, _, err = runCommandWithOutput(commitCmd)
-	if err != nil {
-		c.Fatalf("failed to commit container to image: %s, %v", out, err)
-	}
+	out, _ = dockerCmd(c, "commit", cleanedContainerID)
 
 	cleanedImageID := strings.TrimSpace(out)
 
-	inspectCmd := exec.Command(dockerBinary, "inspect", cleanedImageID)
-	if out, _, err = runCommandWithOutput(inspectCmd); err != nil {
-		c.Fatalf("failed to inspect image: %s, %v", out, err)
-	}
+	dockerCmd(c, "inspect", cleanedImageID)
 }
 
 func (s *DockerSuite) TestCommitWithoutPause(c *check.C) {
-	runCmd := exec.Command(dockerBinary, "run", "-i", "-a", "stdin", "busybox", "echo", "foo")
-	out, _, _, err := runCommandWithStdoutStderr(runCmd)
-	if err != nil {
-		c.Fatalf("failed to run container: %s, %v", out, err)
-	}
+	out, _ := dockerCmd(c, "run", "-i", "-a", "stdin", "busybox", "echo", "foo")
 
 	cleanedContainerID := strings.TrimSpace(out)
 
-	waitCmd := exec.Command(dockerBinary, "wait", cleanedContainerID)
-	if _, _, err = runCommandWithOutput(waitCmd); err != nil {
-		c.Fatalf("error thrown while waiting for container: %s, %v", out, err)
-	}
+	dockerCmd(c, "wait", cleanedContainerID)
 
-	commitCmd := exec.Command(dockerBinary, "commit", "-p=false", cleanedContainerID)
-	out, _, err = runCommandWithOutput(commitCmd)
-	if err != nil {
-		c.Fatalf("failed to commit container to image: %s, %v", out, err)
-	}
+	out, _ = dockerCmd(c, "commit", "-p=false", cleanedContainerID)
 
 	cleanedImageID := strings.TrimSpace(out)
 
-	inspectCmd := exec.Command(dockerBinary, "inspect", cleanedImageID)
-	if out, _, err = runCommandWithOutput(inspectCmd); err != nil {
-		c.Fatalf("failed to inspect image: %s, %v", out, err)
-	}
+	dockerCmd(c, "inspect", cleanedImageID)
 }
 
 //test commit a paused container should not unpause it after commit
 func (s *DockerSuite) TestCommitPausedContainer(c *check.C) {
 	defer unpauseAllContainers()
-	cmd := exec.Command(dockerBinary, "run", "-i", "-d", "busybox")
-	out, _, _, err := runCommandWithStdoutStderr(cmd)
-	if err != nil {
-		c.Fatalf("failed to run container: %v, output: %q", err, out)
-	}
+	out, _ := dockerCmd(c, "run", "-i", "-d", "busybox")
 
 	cleanedContainerID := strings.TrimSpace(out)
-	cmd = exec.Command(dockerBinary, "pause", cleanedContainerID)
-	out, _, _, err = runCommandWithStdoutStderr(cmd)
-	if err != nil {
-		c.Fatalf("failed to pause container: %v, output: %q", err, out)
-	}
 
-	commitCmd := exec.Command(dockerBinary, "commit", cleanedContainerID)
-	out, _, err = runCommandWithOutput(commitCmd)
-	if err != nil {
-		c.Fatalf("failed to commit container to image: %s, %v", out, err)
-	}
+	dockerCmd(c, "pause", cleanedContainerID)
+
+	out, _ = dockerCmd(c, "commit", cleanedContainerID)
 
-	out, err = inspectField(cleanedContainerID, "State.Paused")
+	out, err := inspectField(cleanedContainerID, "State.Paused")
 	c.Assert(err, check.IsNil)
 	if !strings.Contains(out, "true") {
 		c.Fatalf("commit should not unpause a paused container")
@@ -94,24 +54,13 @@ func (s *DockerSuite) TestCommitPausedContainer(c *check.C) {
 
 func (s *DockerSuite) TestCommitNewFile(c *check.C) {
 
-	cmd := exec.Command(dockerBinary, "run", "--name", "commiter", "busybox", "/bin/sh", "-c", "echo koye > /foo")
-	if _, err := runCommand(cmd); err != nil {
-		c.Fatal(err)
-	}
+	dockerCmd(c, "run", "--name", "commiter", "busybox", "/bin/sh", "-c", "echo koye > /foo")
 
-	cmd = exec.Command(dockerBinary, "commit", "commiter")
-	imageID, _, err := runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatal(err)
-	}
+	imageID, _ := dockerCmd(c, "commit", "commiter")
 	imageID = strings.Trim(imageID, "\r\n")
 
-	cmd = exec.Command(dockerBinary, "run", imageID, "cat", "/foo")
+	out, _ := dockerCmd(c, "run", imageID, "cat", "/foo")
 
-	out, _, err := runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatal(err, out)
-	}
 	if actual := strings.Trim(out, "\r\n"); actual != "koye" {
 		c.Fatalf("expected output koye received %q", actual)
 	}
@@ -120,13 +69,9 @@ func (s *DockerSuite) TestCommitNewFile(c *check.C) {
 
 func (s *DockerSuite) TestCommitHardlink(c *check.C) {
 
-	cmd := exec.Command(dockerBinary, "run", "-t", "--name", "hardlinks", "busybox", "sh", "-c", "touch file1 && ln file1 file2 && ls -di file1 file2")
-	firstOuput, _, err := runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatal(err)
-	}
+	firstOutput, _ := dockerCmd(c, "run", "-t", "--name", "hardlinks", "busybox", "sh", "-c", "touch file1 && ln file1 file2 && ls -di file1 file2")
 
-	chunks := strings.Split(strings.TrimSpace(firstOuput), " ")
+	chunks := strings.Split(strings.TrimSpace(firstOutput), " ")
 	inode := chunks[0]
 	found := false
 	for _, chunk := range chunks[1:] {
@@ -139,20 +84,12 @@ func (s *DockerSuite) TestCommitHardlink(c *check.C) {
 		c.Fatalf("Failed to create hardlink in a container. Expected to find %q in %q", inode, chunks[1:])
 	}
 
-	cmd = exec.Command(dockerBinary, "commit", "hardlinks", "hardlinks")
-	imageID, _, err := runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatal(imageID, err)
-	}
+	imageID, _ := dockerCmd(c, "commit", "hardlinks", "hardlinks")
 	imageID = strings.Trim(imageID, "\r\n")
 
-	cmd = exec.Command(dockerBinary, "run", "-t", "hardlinks", "ls", "-di", "file1", "file2")
-	secondOuput, _, err := runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatal(err)
-	}
+	secondOutput, _ := dockerCmd(c, "run", "-t", "hardlinks", "ls", "-di", "file1", "file2")
 
-	chunks = strings.Split(strings.TrimSpace(secondOuput), " ")
+	chunks = strings.Split(strings.TrimSpace(secondOutput), " ")
 	inode = chunks[0]
 	found = false
 	for _, chunk := range chunks[1:] {
@@ -169,56 +106,31 @@ func (s *DockerSuite) TestCommitHardlink(c *check.C) {
 
 func (s *DockerSuite) TestCommitTTY(c *check.C) {
 
-	cmd := exec.Command(dockerBinary, "run", "-t", "--name", "tty", "busybox", "/bin/ls")
-	if _, err := runCommand(cmd); err != nil {
-		c.Fatal(err)
-	}
+	dockerCmd(c, "run", "-t", "--name", "tty", "busybox", "/bin/ls")
 
-	cmd = exec.Command(dockerBinary, "commit", "tty", "ttytest")
-	imageID, _, err := runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatal(err)
-	}
+	imageID, _ := dockerCmd(c, "commit", "tty", "ttytest")
 	imageID = strings.Trim(imageID, "\r\n")
 
-	cmd = exec.Command(dockerBinary, "run", "ttytest", "/bin/ls")
-	if _, err := runCommand(cmd); err != nil {
-		c.Fatal(err)
-	}
+	dockerCmd(c, "run", "ttytest", "/bin/ls")
 
 }
 
 func (s *DockerSuite) TestCommitWithHostBindMount(c *check.C) {
 
-	cmd := exec.Command(dockerBinary, "run", "--name", "bind-commit", "-v", "/dev/null:/winning", "busybox", "true")
-	if _, err := runCommand(cmd); err != nil {
-		c.Fatal(err)
-	}
-
-	cmd = exec.Command(dockerBinary, "commit", "bind-commit", "bindtest")
-	imageID, _, err := runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatal(imageID, err)
-	}
+	dockerCmd(c, "run", "--name", "bind-commit", "-v", "/dev/null:/winning", "busybox", "true")
 
+	imageID, _ := dockerCmd(c, "commit", "bind-commit", "bindtest")
 	imageID = strings.Trim(imageID, "\r\n")
 
-	cmd = exec.Command(dockerBinary, "run", "bindtest", "true")
-
-	if _, err := runCommand(cmd); err != nil {
-		c.Fatal(err)
-	}
+	dockerCmd(c, "run", "bindtest", "true")
 
 }
 
 func (s *DockerSuite) TestCommitChange(c *check.C) {
 
-	cmd := exec.Command(dockerBinary, "run", "--name", "test", "busybox", "true")
-	if _, err := runCommand(cmd); err != nil {
-		c.Fatal(err)
-	}
+	dockerCmd(c, "run", "--name", "test", "busybox", "true")
 
-	cmd = exec.Command(dockerBinary, "commit",
+	imageID, _ := dockerCmd(c, "commit",
 		"--change", "EXPOSE 8080",
 		"--change", "ENV DEBUG true",
 		"--change", "ENV test 1",
@@ -231,11 +143,7 @@ func (s *DockerSuite) TestCommitChange(c *check.C) {
 		"--change", "VOLUME /var/lib/docker",
 		"--change", "ONBUILD /usr/local/bin/python-build --dir /app/src",
 		"test", "test-commit")
-	imageId, _, err := runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatal(imageId, err)
-	}
-	imageId = strings.Trim(imageId, "\r\n")
+	imageID = strings.Trim(imageID, "\r\n")
 
 	expected := map[string]string{
 		"Config.ExposedPorts": "map[8080/tcp:{}]",
@@ -250,7 +158,7 @@ func (s *DockerSuite) TestCommitChange(c *check.C) {
 	}
 
 	for conf, value := range expected {
-		res, err := inspectField(imageId, conf)
+		res, err := inspectField(imageID, conf)
 		c.Assert(err, check.IsNil)
 		if res != value {
 			c.Errorf("%s('%s'), expected %s", conf, res, value)

integration-cli/docker_cli_config_test.go

@@ -69,17 +69,16 @@ func (s *DockerSuite) TestConfigDir(c *check.C) {
 	cDir, _ := ioutil.TempDir("", "fake-home")
 
 	// First make sure pointing to empty dir doesn't generate an error
-	cmd := exec.Command(dockerBinary, "--config", cDir, "ps")
-	out, rc, err := runCommandWithOutput(cmd)
+	out, rc := dockerCmd(c, "--config", cDir, "ps")
 
-	if rc != 0 || err != nil {
-		c.Fatalf("ps1 didn't work:\nrc:%d\nout%s\nerr:%v", rc, out, err)
+	if rc != 0 {
+		c.Fatalf("ps1 didn't work:\nrc:%d\nout%s", rc, out)
 	}
 
 	// Test with env var too
-	cmd = exec.Command(dockerBinary, "ps")
+	cmd := exec.Command(dockerBinary, "ps")
 	cmd.Env = append(os.Environ(), "DOCKER_CONFIG="+cDir)
-	out, rc, err = runCommandWithOutput(cmd)
+	out, rc, err := runCommandWithOutput(cmd)
 
 	if rc != 0 || err != nil {
 		c.Fatalf("ps2 didn't work:\nrc:%d\nout%s\nerr:%v", rc, out, err)

integration-cli/docker_cli_cp_test.go

@@ -61,7 +61,7 @@ func (s *DockerSuite) TestCpGarbagePath(c *check.C) {
 
 	path := path.Join("../../../../../../../../../../../../", cpFullPath)
 
-	_, _ = dockerCmd(c, "cp", cleanedContainerID+":"+path, tmpdir)
+	dockerCmd(c, "cp", cleanedContainerID+":"+path, tmpdir)
 
 	file, _ := os.Open(tmpname)
 	defer file.Close()
@@ -126,7 +126,7 @@ func (s *DockerSuite) TestCpRelativePath(c *check.C) {
 		c.Fatalf("path %s was assumed to be an absolute path", cpFullPath)
 	}
 
-	_, _ = dockerCmd(c, "cp", cleanedContainerID+":"+relPath, tmpdir)
+	dockerCmd(c, "cp", cleanedContainerID+":"+relPath, tmpdir)
 
 	file, _ := os.Open(tmpname)
 	defer file.Close()
@@ -184,7 +184,7 @@ func (s *DockerSuite) TestCpAbsolutePath(c *check.C) {
 
 	path := cpFullPath
 
-	_, _ = dockerCmd(c, "cp", cleanedContainerID+":"+path, tmpdir)
+	dockerCmd(c, "cp", cleanedContainerID+":"+path, tmpdir)
 
 	file, _ := os.Open(tmpname)
 	defer file.Close()
@@ -243,7 +243,7 @@ func (s *DockerSuite) TestCpAbsoluteSymlink(c *check.C) {
 
 	path := path.Join("/", "container_path")
 
-	_, _ = dockerCmd(c, "cp", cleanedContainerID+":"+path, tmpdir)
+	dockerCmd(c, "cp", cleanedContainerID+":"+path, tmpdir)
 
 	file, _ := os.Open(tmpname)
 	defer file.Close()
@@ -302,7 +302,7 @@ func (s *DockerSuite) TestCpSymlinkComponent(c *check.C) {
 
 	path := path.Join("/", "container_path", cpTestName)
 
-	_, _ = dockerCmd(c, "cp", cleanedContainerID+":"+path, tmpdir)
+	dockerCmd(c, "cp", cleanedContainerID+":"+path, tmpdir)
 
 	file, _ := os.Open(tmpname)
 	defer file.Close()
@@ -380,7 +380,7 @@ func (s *DockerSuite) TestCpSpecialFiles(c *check.C) {
 	}
 
 	// Copy actual /etc/resolv.conf
-	_, _ = dockerCmd(c, "cp", cleanedContainerID+":/etc/resolv.conf", outDir)
+	dockerCmd(c, "cp", cleanedContainerID+":/etc/resolv.conf", outDir)
 
 	expected, err := ioutil.ReadFile("/var/lib/docker/containers/" + cleanedContainerID + "/resolv.conf")
 	actual, err := ioutil.ReadFile(outDir + "/resolv.conf")
@@ -390,7 +390,7 @@ func (s *DockerSuite) TestCpSpecialFiles(c *check.C) {
 	}
 
 	// Copy actual /etc/hosts
-	_, _ = dockerCmd(c, "cp", cleanedContainerID+":/etc/hosts", outDir)
+	dockerCmd(c, "cp", cleanedContainerID+":/etc/hosts", outDir)
 
 	expected, err = ioutil.ReadFile("/var/lib/docker/containers/" + cleanedContainerID + "/hosts")
 	actual, err = ioutil.ReadFile(outDir + "/hosts")
@@ -400,7 +400,7 @@ func (s *DockerSuite) TestCpSpecialFiles(c *check.C) {
 	}
 
 	// Copy actual /etc/resolv.conf
-	_, _ = dockerCmd(c, "cp", cleanedContainerID+":/etc/hostname", outDir)
+	dockerCmd(c, "cp", cleanedContainerID+":/etc/hostname", outDir)
 
 	expected, err = ioutil.ReadFile("/var/lib/docker/containers/" + cleanedContainerID + "/hostname")
 	actual, err = ioutil.ReadFile(outDir + "/hostname")
@@ -442,7 +442,7 @@ func (s *DockerSuite) TestCpVolumePath(c *check.C) {
 	}
 
 	// Copy actual volume path
-	_, _ = dockerCmd(c, "cp", cleanedContainerID+":/foo", outDir)
+	dockerCmd(c, "cp", cleanedContainerID+":/foo", outDir)
 
 	stat, err := os.Stat(outDir + "/foo")
 	if err != nil {
@@ -460,7 +460,7 @@ func (s *DockerSuite) TestCpVolumePath(c *check.C) {
 	}
 
 	// Copy file nested in volume
-	_, _ = dockerCmd(c, "cp", cleanedContainerID+":/foo/bar", outDir)
+	dockerCmd(c, "cp", cleanedContainerID+":/foo/bar", outDir)
 
 	stat, err = os.Stat(outDir + "/bar")
 	if err != nil {
@@ -471,7 +471,7 @@ func (s *DockerSuite) TestCpVolumePath(c *check.C) {
 	}
 
 	// Copy Bind-mounted dir
-	_, _ = dockerCmd(c, "cp", cleanedContainerID+":/baz", outDir)
+	dockerCmd(c, "cp", cleanedContainerID+":/baz", outDir)
 	stat, err = os.Stat(outDir + "/baz")
 	if err != nil {
 		c.Fatal(err)
@@ -481,7 +481,7 @@ func (s *DockerSuite) TestCpVolumePath(c *check.C) {
 	}
 
 	// Copy file nested in bind-mounted dir
-	_, _ = dockerCmd(c, "cp", cleanedContainerID+":/baz/test", outDir)
+	dockerCmd(c, "cp", cleanedContainerID+":/baz/test", outDir)
 	fb, err := ioutil.ReadFile(outDir + "/baz/test")
 	if err != nil {
 		c.Fatal(err)
@@ -495,7 +495,7 @@ func (s *DockerSuite) TestCpVolumePath(c *check.C) {
 	}
 
 	// Copy bind-mounted file
-	_, _ = dockerCmd(c, "cp", cleanedContainerID+":/test", outDir)
+	dockerCmd(c, "cp", cleanedContainerID+":/test", outDir)
 	fb, err = ioutil.ReadFile(outDir + "/test")
 	if err != nil {
 		c.Fatal(err)
@@ -536,7 +536,7 @@ func (s *DockerSuite) TestCpToDot(c *check.C) {
 	if err := os.Chdir(tmpdir); err != nil {
 		c.Fatal(err)
 	}
-	_, _ = dockerCmd(c, "cp", cleanedContainerID+":/test", ".")
+	dockerCmd(c, "cp", cleanedContainerID+":/test", ".")
 	content, err := ioutil.ReadFile("./test")
 	if string(content) != "lololol\n" {
 		c.Fatalf("Wrong content in copied file %q, should be %q", content, "lololol\n")
@@ -589,7 +589,7 @@ func (s *DockerSuite) TestCpNameHasColon(c *check.C) {
 		c.Fatal(err)
 	}
 	defer os.RemoveAll(tmpdir)
-	_, _ = dockerCmd(c, "cp", cleanedContainerID+":/te:s:t", tmpdir)
+	dockerCmd(c, "cp", cleanedContainerID+":/te:s:t", tmpdir)
 	content, err := ioutil.ReadFile(tmpdir + "/te:s:t")
 	if string(content) != "lololol\n" {
 		c.Fatalf("Wrong content in copied file %q, should be %q", content, "lololol\n")
@@ -598,17 +598,12 @@ func (s *DockerSuite) TestCpNameHasColon(c *check.C) {
 
 func (s *DockerSuite) TestCopyAndRestart(c *check.C) {
 	expectedMsg := "hello"
-	out, err := exec.Command(dockerBinary, "run", "-d", "busybox", "echo", expectedMsg).CombinedOutput()
-	if err != nil {
-		c.Fatal(string(out), err)
-	}
+	out, _ := dockerCmd(c, "run", "-d", "busybox", "echo", expectedMsg)
 	id := strings.TrimSpace(string(out))
 
-	if out, err = exec.Command(dockerBinary, "wait", id).CombinedOutput(); err != nil {
-		c.Fatalf("unable to wait for container: %s", err)
-	}
+	out, _ = dockerCmd(c, "wait", id)
 
-	status := strings.TrimSpace(string(out))
+	status := strings.TrimSpace(out)
 	if status != "0" {
 		c.Fatalf("container exited with status %s", status)
 	}
@@ -619,33 +614,23 @@ func (s *DockerSuite) TestCopyAndRestart(c *check.C) {
 	}
 	defer os.RemoveAll(tmpDir)
 
-	if _, err = exec.Command(dockerBinary, "cp", fmt.Sprintf("%s:/etc/issue", id), tmpDir).CombinedOutput(); err != nil {
-		c.Fatalf("unable to copy from busybox container: %s", err)
-	}
+	dockerCmd(c, "cp", fmt.Sprintf("%s:/etc/issue", id), tmpDir)
 
-	if out, err = exec.Command(dockerBinary, "start", "-a", id).CombinedOutput(); err != nil {
-		c.Fatalf("unable to start busybox container after copy: %s - %s", err, out)
-	}
+	out, _ = dockerCmd(c, "start", "-a", id)
 
-	msg := strings.TrimSpace(string(out))
+	msg := strings.TrimSpace(out)
 	if msg != expectedMsg {
 		c.Fatalf("expected %q but got %q", expectedMsg, msg)
 	}
 }
 
 func (s *DockerSuite) TestCopyCreatedContainer(c *check.C) {
-	out, err := exec.Command(dockerBinary, "create", "--name", "test_cp", "-v", "/test", "busybox").CombinedOutput()
-	if err != nil {
-		c.Fatalf(string(out), err)
-	}
+	dockerCmd(c, "create", "--name", "test_cp", "-v", "/test", "busybox")
 
 	tmpDir, err := ioutil.TempDir("", "test")
 	if err != nil {
 		c.Fatalf("unable to make temporary directory: %s", err)
 	}
 	defer os.RemoveAll(tmpDir)
-	out, err = exec.Command(dockerBinary, "cp", "test_cp:/bin/sh", tmpDir).CombinedOutput()
-	if err != nil {
-		c.Fatalf(string(out), err)
-	}
+	dockerCmd(c, "cp", "test_cp:/bin/sh", tmpDir)
 }

integration-cli/docker_cli_create_test.go

@@ -4,7 +4,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"os"
-	"os/exec"
 	"reflect"
 	"strings"
 	"time"
@@ -15,19 +14,11 @@ import (
 
 // Make sure we can create a simple container with some args
 func (s *DockerSuite) TestCreateArgs(c *check.C) {
-	runCmd := exec.Command(dockerBinary, "create", "busybox", "command", "arg1", "arg2", "arg with space")
-	out, _, _, err := runCommandWithStdoutStderr(runCmd)
-	if err != nil {
-		c.Fatal(out, err)
-	}
+	out, _ := dockerCmd(c, "create", "busybox", "command", "arg1", "arg2", "arg with space")
 
 	cleanedContainerID := strings.TrimSpace(out)
 
-	inspectCmd := exec.Command(dockerBinary, "inspect", cleanedContainerID)
-	out, _, err = runCommandWithOutput(inspectCmd)
-	if err != nil {
-		c.Fatalf("out should've been a container id: %s, %v", out, err)
-	}
+	out, _ = dockerCmd(c, "inspect", cleanedContainerID)
 
 	containers := []struct {
 		ID      string
@@ -65,19 +56,11 @@ func (s *DockerSuite) TestCreateArgs(c *check.C) {
 // Make sure we can set hostconfig options too
 func (s *DockerSuite) TestCreateHostConfig(c *check.C) {
 
-	runCmd := exec.Command(dockerBinary, "create", "-P", "busybox", "echo")
-	out, _, _, err := runCommandWithStdoutStderr(runCmd)
-	if err != nil {
-		c.Fatal(out, err)
-	}
+	out, _ := dockerCmd(c, "create", "-P", "busybox", "echo")
 
 	cleanedContainerID := strings.TrimSpace(out)
 
-	inspectCmd := exec.Command(dockerBinary, "inspect", cleanedContainerID)
-	out, _, err = runCommandWithOutput(inspectCmd)
-	if err != nil {
-		c.Fatalf("out should've been a container id: %s, %v", out, err)
-	}
+	out, _ = dockerCmd(c, "inspect", cleanedContainerID)
 
 	containers := []struct {
 		HostConfig *struct {
@@ -104,19 +87,11 @@ func (s *DockerSuite) TestCreateHostConfig(c *check.C) {
 
 func (s *DockerSuite) TestCreateWithPortRange(c *check.C) {
 
-	runCmd := exec.Command(dockerBinary, "create", "-p", "3300-3303:3300-3303/tcp", "busybox", "echo")
-	out, _, _, err := runCommandWithStdoutStderr(runCmd)
-	if err != nil {
-		c.Fatal(out, err)
-	}
+	out, _ := dockerCmd(c, "create", "-p", "3300-3303:3300-3303/tcp", "busybox", "echo")
 
 	cleanedContainerID := strings.TrimSpace(out)
 
-	inspectCmd := exec.Command(dockerBinary, "inspect", cleanedContainerID)
-	out, _, err = runCommandWithOutput(inspectCmd)
-	if err != nil {
-		c.Fatalf("out should've been a container id: %s, %v", out, err)
-	}
+	out, _ = dockerCmd(c, "inspect", cleanedContainerID)
 
 	containers := []struct {
 		HostConfig *struct {
@@ -151,19 +126,11 @@ func (s *DockerSuite) TestCreateWithPortRange(c *check.C) {
 
 func (s *DockerSuite) TestCreateWithiLargePortRange(c *check.C) {
 
-	runCmd := exec.Command(dockerBinary, "create", "-p", "1-65535:1-65535/tcp", "busybox", "echo")
-	out, _, _, err := runCommandWithStdoutStderr(runCmd)
-	if err != nil {
-		c.Fatal(out, err)
-	}
+	out, _ := dockerCmd(c, "create", "-p", "1-65535:1-65535/tcp", "busybox", "echo")
 
 	cleanedContainerID := strings.TrimSpace(out)
 
-	inspectCmd := exec.Command(dockerBinary, "inspect", cleanedContainerID)
-	out, _, err = runCommandWithOutput(inspectCmd)
-	if err != nil {
-		c.Fatalf("out should've been a container id: %s, %v", out, err)
-	}
+	out, _ = dockerCmd(c, "inspect", cleanedContainerID)
 
 	containers := []struct {
 		HostConfig *struct {
@@ -199,19 +166,11 @@ func (s *DockerSuite) TestCreateWithiLargePortRange(c *check.C) {
 // "test123" should be printed by docker create + start
 func (s *DockerSuite) TestCreateEchoStdout(c *check.C) {
 
-	runCmd := exec.Command(dockerBinary, "create", "busybox", "echo", "test123")
-	out, _, _, err := runCommandWithStdoutStderr(runCmd)
-	if err != nil {
-		c.Fatal(out, err)
-	}
+	out, _ := dockerCmd(c, "create", "busybox", "echo", "test123")
 
 	cleanedContainerID := strings.TrimSpace(out)
 
-	runCmd = exec.Command(dockerBinary, "start", "-ai", cleanedContainerID)
-	out, _, _, err = runCommandWithStdoutStderr(runCmd)
-	if err != nil {
-		c.Fatal(out, err)
-	}
+	out, _ = dockerCmd(c, "start", "-ai", cleanedContainerID)
 
 	if out != "test123\n" {
 		c.Errorf("container should've printed 'test123', got %q", out)
@@ -223,9 +182,8 @@ func (s *DockerSuite) TestCreateVolumesCreated(c *check.C) {
 	testRequires(c, SameHostDaemon)
 
 	name := "test_create_volume"
-	if out, _, err := runCommandWithOutput(exec.Command(dockerBinary, "create", "--name", name, "-v", "/foo", "busybox")); err != nil {
-		c.Fatal(out, err)
-	}
+	dockerCmd(c, "create", "--name", name, "-v", "/foo", "busybox")
+
 	dir, err := inspectFieldMap(name, "Volumes", "/foo")
 	if err != nil {
 		c.Fatalf("Error getting volume host path: %q", err)
@@ -243,9 +201,7 @@ func (s *DockerSuite) TestCreateVolumesCreated(c *check.C) {
 func (s *DockerSuite) TestCreateLabels(c *check.C) {
 	name := "test_create_labels"
 	expected := map[string]string{"k1": "v1", "k2": "v2"}
-	if out, _, err := runCommandWithOutput(exec.Command(dockerBinary, "create", "--name", name, "-l", "k1=v1", "--label", "k2=v2", "busybox")); err != nil {
-		c.Fatal(out, err)
-	}
+	dockerCmd(c, "create", "--name", name, "-l", "k1=v1", "--label", "k2=v2", "busybox")
 
 	actual := make(map[string]string)
 	err := inspectFieldAndMarshall(name, "Config.Labels", &actual)
@@ -270,9 +226,7 @@ func (s *DockerSuite) TestCreateLabelFromImage(c *check.C) {
 
 	name := "test_create_labels_from_image"
 	expected := map[string]string{"k2": "x", "k3": "v3"}
-	if out, _, err := runCommandWithOutput(exec.Command(dockerBinary, "create", "--name", name, "-l", "k2=x", "--label", "k3=v3", imageName)); err != nil {
-		c.Fatal(out, err)
-	}
+	dockerCmd(c, "create", "--name", name, "-l", "k2=x", "--label", "k3=v3", imageName)
 
 	actual := make(map[string]string)
 	err = inspectFieldAndMarshall(name, "Config.Labels", &actual)
@@ -297,47 +251,23 @@ func (s *DockerSuite) TestCreateRM(c *check.C) {
 	// "Created" state, and has ever been run. Test "rm -f" too.
 
 	// create a container
-	createCmd := exec.Command(dockerBinary, "create", "busybox")
-	out, _, err := runCommandWithOutput(createCmd)
-	if err != nil {
-		c.Fatalf("Failed to create container:%s\n%s", out, err)
-	}
+	out, _ := dockerCmd(c, "create", "busybox")
 	cID := strings.TrimSpace(out)
 
-	rmCmd := exec.Command(dockerBinary, "rm", cID)
-	out, _, err = runCommandWithOutput(rmCmd)
-	if err != nil {
-		c.Fatalf("Failed to rm container:%s\n%s", out, err)
-	}
+	dockerCmd(c, "rm", cID)
 
 	// Now do it again so we can "rm -f" this time
-	createCmd = exec.Command(dockerBinary, "create", "busybox")
-	out, _, err = runCommandWithOutput(createCmd)
-	if err != nil {
-		c.Fatalf("Failed to create 2nd container:%s\n%s", out, err)
-	}
+	out, _ = dockerCmd(c, "create", "busybox")
 
 	cID = strings.TrimSpace(out)
-	rmCmd = exec.Command(dockerBinary, "rm", "-f", cID)
-	out, _, err = runCommandWithOutput(rmCmd)
-	if err != nil {
-		c.Fatalf("Failed to rm -f container:%s\n%s", out, err)
-	}
+	dockerCmd(c, "rm", "-f", cID)
 }
 
 func (s *DockerSuite) TestCreateModeIpcContainer(c *check.C) {
 	testRequires(c, SameHostDaemon)
 
-	cmd := exec.Command(dockerBinary, "create", "busybox")
-	out, _, err := runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatal(err, out)
-	}
+	out, _ := dockerCmd(c, "create", "busybox")
 	id := strings.TrimSpace(out)
 
-	cmd = exec.Command(dockerBinary, "create", fmt.Sprintf("--ipc=container:%s", id), "busybox")
-	out, _, err = runCommandWithOutput(cmd)
-	if err != nil {
-		c.Fatalf("Create container with ipc mode container should success with non running container: %s\n%s", out, err)
-	}
+	dockerCmd(c, "create", fmt.Sprintf("--ipc=container:%s", id), "busybox")
 }

integration-cli/docker_cli_pause_test.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"fmt"
-	"os/exec"
 	"strings"
 
 	"github.com/go-check/check"
@@ -27,8 +26,7 @@ func (s *DockerSuite) TestPause(c *check.C) {
 
 	dockerCmd(c, "unpause", name)
 
-	eventsCmd := exec.Command(dockerBinary, "events", "--since=0", fmt.Sprintf("--until=%d", daemonTime(c).Unix()))
-	out, _, _ = runCommandWithOutput(eventsCmd)
+	out, _ = dockerCmd(c, "events", "--since=0", fmt.Sprintf("--until=%d", daemonTime(c).Unix()))
 	events := strings.Split(out, "\n")
 	if len(events) <= 1 {
 		c.Fatalf("Missing expected event")
@@ -69,8 +67,7 @@ func (s *DockerSuite) TestPauseMultipleContainers(c *check.C) {
 
 	dockerCmd(c, append([]string{"unpause"}, containers...)...)
 
-	eventsCmd := exec.Command(dockerBinary, "events", "--since=0", fmt.Sprintf("--until=%d", daemonTime(c).Unix()))
-	out, _, _ = runCommandWithOutput(eventsCmd)
+	out, _ = dockerCmd(c, "events", "--since=0", fmt.Sprintf("--until=%d", daemonTime(c).Unix()))
 	events := strings.Split(out, "\n")
 	if len(events) <= len(containers)*3-2 {
 		c.Fatalf("Missing expected event")

integration-cli/docker_cli_port_test.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"fmt"
-	"os/exec"
 	"regexp"
 	"sort"
 	"strings"
@@ -13,64 +12,37 @@ import (
 func (s *DockerSuite) TestPortList(c *check.C) {
 
 	// one port
-	runCmd := exec.Command(dockerBinary, "run", "-d", "-p", "9876:80", "busybox", "top")
-	out, _, err := runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatal(out, err)
-	}
+	out, _ := dockerCmd(c, "run", "-d", "-p", "9876:80", "busybox", "top")
 	firstID := strings.TrimSpace(out)
 
-	runCmd = exec.Command(dockerBinary, "port", firstID, "80")
-	out, _, err = runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatal(out, err)
-	}
+	out, _ = dockerCmd(c, "port", firstID, "80")
 
 	if !assertPortList(c, out, []string{"0.0.0.0:9876"}) {
 		c.Error("Port list is not correct")
 	}
 
-	runCmd = exec.Command(dockerBinary, "port", firstID)
-	out, _, err = runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatal(out, err)
-	}
+	out, _ = dockerCmd(c, "port", firstID)
 
 	if !assertPortList(c, out, []string{"80/tcp -> 0.0.0.0:9876"}) {
 		c.Error("Port list is not correct")
 	}
-	runCmd = exec.Command(dockerBinary, "rm", "-f", firstID)
-	if out, _, err = runCommandWithOutput(runCmd); err != nil {
-		c.Fatal(out, err)
-	}
+	dockerCmd(c, "rm", "-f", firstID)
 
 	// three port
-	runCmd = exec.Command(dockerBinary, "run", "-d",
+	out, _ = dockerCmd(c, "run", "-d",
 		"-p", "9876:80",
 		"-p", "9877:81",
 		"-p", "9878:82",
 		"busybox", "top")
-	out, _, err = runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatal(out, err)
-	}
 	ID := strings.TrimSpace(out)
 
-	runCmd = exec.Command(dockerBinary, "port", ID, "80")
-	out, _, err = runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatal(out, err)
-	}
+	out, _ = dockerCmd(c, "port", ID, "80")
 
 	if !assertPortList(c, out, []string{"0.0.0.0:9876"}) {
 		c.Error("Port list is not correct")
 	}
 
-	runCmd = exec.Command(dockerBinary, "port", ID)
-	out, _, err = runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatal(out, err)
-	}
+	out, _ = dockerCmd(c, "port", ID)
 
 	if !assertPortList(c, out, []string{
 		"80/tcp -> 0.0.0.0:9876",
@@ -78,40 +50,24 @@ func (s *DockerSuite) TestPortList(c *check.C) {
 		"82/tcp -> 0.0.0.0:9878"}) {
 		c.Error("Port list is not correct")
 	}
-	runCmd = exec.Command(dockerBinary, "rm", "-f", ID)
-	out, _, err = runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatal(out, err)
-	}
+	dockerCmd(c, "rm", "-f", ID)
 
 	// more and one port mapped to the same container port
-	runCmd = exec.Command(dockerBinary, "run", "-d",
+	out, _ = dockerCmd(c, "run", "-d",
 		"-p", "9876:80",
 		"-p", "9999:80",
 		"-p", "9877:81",
 		"-p", "9878:82",
 		"busybox", "top")
-	out, _, err = runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatal(out, err)
-	}
 	ID = strings.TrimSpace(out)
 
-	runCmd = exec.Command(dockerBinary, "port", ID, "80")
-	out, _, err = runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatal(out, err)
-	}
+	out, _ = dockerCmd(c, "port", ID, "80")
 
 	if !assertPortList(c, out, []string{"0.0.0.0:9876", "0.0.0.0:9999"}) {
 		c.Error("Port list is not correct")
 	}
 
-	runCmd = exec.Command(dockerBinary, "port", ID)
-	out, _, err = runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatal(out, err)
-	}
+	out, _ = dockerCmd(c, "port", ID)
 
 	if !assertPortList(c, out, []string{
 		"80/tcp -> 0.0.0.0:9876",
@@ -120,10 +76,7 @@ func (s *DockerSuite) TestPortList(c *check.C) {
 		"82/tcp -> 0.0.0.0:9878"}) {
 		c.Error("Port list is not correct\n", out)
 	}
-	runCmd = exec.Command(dockerBinary, "rm", "-f", ID)
-	if out, _, err = runCommandWithOutput(runCmd); err != nil {
-		c.Fatal(out, err)
-	}
+	dockerCmd(c, "rm", "-f", ID)
 
 }
 
@@ -148,9 +101,7 @@ func assertPortList(c *check.C, out string, expected []string) bool {
 }
 
 func stopRemoveContainer(id string, c *check.C) {
-	runCmd := exec.Command(dockerBinary, "rm", "-f", id)
-	_, _, err := runCommandWithOutput(runCmd)
-	c.Assert(err, check.IsNil)
+	dockerCmd(c, "rm", "-f", id)
 }
 
 func (s *DockerSuite) TestUnpublishedPortsInPsOutput(c *check.C) {
@@ -159,31 +110,23 @@ func (s *DockerSuite) TestUnpublishedPortsInPsOutput(c *check.C) {
 	port2 := 443
 	expose1 := fmt.Sprintf("--expose=%d", port1)
 	expose2 := fmt.Sprintf("--expose=%d", port2)
-	runCmd := exec.Command(dockerBinary, "run", "-d", expose1, expose2, "busybox", "sleep", "5")
-	out, _, err := runCommandWithOutput(runCmd)
-	c.Assert(err, check.IsNil)
+	dockerCmd(c, "run", "-d", expose1, expose2, "busybox", "sleep", "5")
 
 	// Check docker ps o/p for last created container reports the unpublished ports
 	unpPort1 := fmt.Sprintf("%d/tcp", port1)
 	unpPort2 := fmt.Sprintf("%d/tcp", port2)
-	runCmd = exec.Command(dockerBinary, "ps", "-n=1")
-	out, _, err = runCommandWithOutput(runCmd)
-	c.Assert(err, check.IsNil)
+	out, _ := dockerCmd(c, "ps", "-n=1")
 	if !strings.Contains(out, unpPort1) || !strings.Contains(out, unpPort2) {
 		c.Errorf("Missing unpublished ports(s) (%s, %s) in docker ps output: %s", unpPort1, unpPort2, out)
 	}
 
 	// Run the container forcing to publish the exposed ports
-	runCmd = exec.Command(dockerBinary, "run", "-d", "-P", expose1, expose2, "busybox", "sleep", "5")
-	out, _, err = runCommandWithOutput(runCmd)
-	c.Assert(err, check.IsNil)
+	dockerCmd(c, "run", "-d", "-P", expose1, expose2, "busybox", "sleep", "5")
 
 	// Check docker ps o/p for last created container reports the exposed ports in the port bindings
 	expBndRegx1 := regexp.MustCompile(`0.0.0.0:\d\d\d\d\d->` + unpPort1)
 	expBndRegx2 := regexp.MustCompile(`0.0.0.0:\d\d\d\d\d->` + unpPort2)
-	runCmd = exec.Command(dockerBinary, "ps", "-n=1")
-	out, _, err = runCommandWithOutput(runCmd)
-	c.Assert(err, check.IsNil)
+	out, _ = dockerCmd(c, "ps", "-n=1")
 	if !expBndRegx1.MatchString(out) || !expBndRegx2.MatchString(out) {
 		c.Errorf("Cannot find expected port binding ports(s) (0.0.0.0:xxxxx->%s, 0.0.0.0:xxxxx->%s) in docker ps output:\n%s",
 			unpPort1, unpPort2, out)
@@ -193,17 +136,13 @@ func (s *DockerSuite) TestUnpublishedPortsInPsOutput(c *check.C) {
 	offset := 10000
 	pFlag1 := fmt.Sprintf("%d:%d", offset+port1, port1)
 	pFlag2 := fmt.Sprintf("%d:%d", offset+port2, port2)
-	runCmd = exec.Command(dockerBinary, "run", "-d", "-p", pFlag1, "-p", pFlag2, expose1, expose2, "busybox", "sleep", "5")
-	out, _, err = runCommandWithOutput(runCmd)
-	c.Assert(err, check.IsNil)
+	out, _ = dockerCmd(c, "run", "-d", "-p", pFlag1, "-p", pFlag2, expose1, expose2, "busybox", "sleep", "5")
 	id := strings.TrimSpace(out)
 
 	// Check docker ps o/p for last created container reports the specified port mappings
 	expBnd1 := fmt.Sprintf("0.0.0.0:%d->%s", offset+port1, unpPort1)
 	expBnd2 := fmt.Sprintf("0.0.0.0:%d->%s", offset+port2, unpPort2)
-	runCmd = exec.Command(dockerBinary, "ps", "-n=1")
-	out, _, err = runCommandWithOutput(runCmd)
-	c.Assert(err, check.IsNil)
+	out, _ = dockerCmd(c, "ps", "-n=1")
 	if !strings.Contains(out, expBnd1) || !strings.Contains(out, expBnd2) {
 		c.Errorf("Cannot find expected port binding(s) (%s, %s) in docker ps output: %s", expBnd1, expBnd2, out)
 	}
@@ -211,15 +150,11 @@ func (s *DockerSuite) TestUnpublishedPortsInPsOutput(c *check.C) {
 	stopRemoveContainer(id, c)
 
 	// Run the container with explicit port bindings and no exposed ports
-	runCmd = exec.Command(dockerBinary, "run", "-d", "-p", pFlag1, "-p", pFlag2, "busybox", "sleep", "5")
-	out, _, err = runCommandWithOutput(runCmd)
-	c.Assert(err, check.IsNil)
+	out, _ = dockerCmd(c, "run", "-d", "-p", pFlag1, "-p", pFlag2, "busybox", "sleep", "5")
 	id = strings.TrimSpace(out)
 
 	// Check docker ps o/p for last created container reports the specified port mappings
-	runCmd = exec.Command(dockerBinary, "ps", "-n=1")
-	out, _, err = runCommandWithOutput(runCmd)
-	c.Assert(err, check.IsNil)
+	out, _ = dockerCmd(c, "ps", "-n=1")
 	if !strings.Contains(out, expBnd1) || !strings.Contains(out, expBnd2) {
 		c.Errorf("Cannot find expected port binding(s) (%s, %s) in docker ps output: %s", expBnd1, expBnd2, out)
 	}
@@ -227,14 +162,10 @@ func (s *DockerSuite) TestUnpublishedPortsInPsOutput(c *check.C) {
 	stopRemoveContainer(id, c)
 
 	// Run the container with one unpublished exposed port and one explicit port binding
-	runCmd = exec.Command(dockerBinary, "run", "-d", expose1, "-p", pFlag2, "busybox", "sleep", "5")
-	out, _, err = runCommandWithOutput(runCmd)
-	c.Assert(err, check.IsNil)
+	dockerCmd(c, "run", "-d", expose1, "-p", pFlag2, "busybox", "sleep", "5")
 
 	// Check docker ps o/p for last created container reports the specified unpublished port and port mapping
-	runCmd = exec.Command(dockerBinary, "ps", "-n=1")
-	out, _, err = runCommandWithOutput(runCmd)
-	c.Assert(err, check.IsNil)
+	out, _ = dockerCmd(c, "ps", "-n=1")
 	if !strings.Contains(out, unpPort1) || !strings.Contains(out, expBnd2) {
 		c.Errorf("Missing unpublished ports or port binding (%s, %s) in docker ps output: %s", unpPort1, expBnd2, out)
 	}

integration-cli/docker_cli_port_unix_test.go

@@ -4,63 +4,39 @@ package main
 
 import (
 	"net"
-	"os/exec"
 	"strings"
 
 	"github.com/go-check/check"
 )
 
 func (s *DockerSuite) TestPortHostBinding(c *check.C) {
-	runCmd := exec.Command(dockerBinary, "run", "-d", "-p", "9876:80", "busybox",
+	out, _ := dockerCmd(c, "run", "-d", "-p", "9876:80", "busybox",
 		"nc", "-l", "-p", "80")
-	out, _, err := runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatal(out, err)
-	}
 	firstID := strings.TrimSpace(out)
 
-	runCmd = exec.Command(dockerBinary, "port", firstID, "80")
-	out, _, err = runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatal(out, err)
-	}
+	out, _ = dockerCmd(c, "port", firstID, "80")
 
 	if !assertPortList(c, out, []string{"0.0.0.0:9876"}) {
 		c.Error("Port list is not correct")
 	}
 
-	runCmd = exec.Command(dockerBinary, "run", "--net=host", "busybox",
+	dockerCmd(c, "run", "--net=host", "busybox",
 		"nc", "localhost", "9876")
-	if out, _, err = runCommandWithOutput(runCmd); err != nil {
-		c.Fatal(out, err)
-	}
 
-	runCmd = exec.Command(dockerBinary, "rm", "-f", firstID)
-	if out, _, err = runCommandWithOutput(runCmd); err != nil {
-		c.Fatal(out, err)
-	}
+	dockerCmd(c, "rm", "-f", firstID)
 
-	runCmd = exec.Command(dockerBinary, "run", "--net=host", "busybox",
-		"nc", "localhost", "9876")
-	if out, _, err = runCommandWithOutput(runCmd); err == nil {
+	if _, _, err := dockerCmdWithError(c, "run", "--net=host", "busybox",
+		"nc", "localhost", "9876"); err == nil {
 		c.Error("Port is still bound after the Container is removed")
 	}
 }
 
 func (s *DockerSuite) TestPortExposeHostBinding(c *check.C) {
-	runCmd := exec.Command(dockerBinary, "run", "-d", "-P", "--expose", "80", "busybox",
+	out, _ := dockerCmd(c, "run", "-d", "-P", "--expose", "80", "busybox",
 		"nc", "-l", "-p", "80")
-	out, _, err := runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatal(out, err)
-	}
 	firstID := strings.TrimSpace(out)
 
-	runCmd = exec.Command(dockerBinary, "port", firstID, "80")
-	out, _, err = runCommandWithOutput(runCmd)
-	if err != nil {
-		c.Fatal(out, err)
-	}
+	out, _ = dockerCmd(c, "port", firstID, "80")
 
 	_, exposedPort, err := net.SplitHostPort(out)
 
@@ -68,20 +44,13 @@ func (s *DockerSuite) TestPortExposeHostBinding(c *check.C) {
 		c.Fatal(out, err)
 	}
 
-	runCmd = exec.Command(dockerBinary, "run", "--net=host", "busybox",
+	dockerCmd(c, "run", "--net=host", "busybox",
 		"nc", "localhost", strings.TrimSpace(exposedPort))
-	if out, _, err = runCommandWithOutput(runCmd); err != nil {
-		c.Fatal(out, err)
-	}
 
-	runCmd = exec.Command(dockerBinary, "rm", "-f", firstID)
-	if out, _, err = runCommandWithOutput(runCmd); err != nil {
-		c.Fatal(out, err)
-	}
+	dockerCmd(c, "rm", "-f", firstID)
 
-	runCmd = exec.Command(dockerBinary, "run", "--net=host", "busybox",
-		"nc", "localhost", strings.TrimSpace(exposedPort))
-	if out, _, err = runCommandWithOutput(runCmd); err == nil {
+	if _, _, err = dockerCmdWithError(c, "run", "--net=host", "busybox",
+		"nc", "localhost", strings.TrimSpace(exposedPort)); err == nil {
 		c.Error("Port is still bound after the Container is removed")
 	}
 }

integration-cli/docker_cli_ps_test.go

@@ -337,8 +337,7 @@ func (s *DockerSuite) TestPsListContainersFilterExited(c *check.C) {
 		c.Fatal(err)
 	}
 
-	runCmd := exec.Command(dockerBinary, "run", "--name", "nonzero1", "busybox", "false")
-	if out, _, err := runCommandWithOutput(runCmd); err == nil {
+	if out, _, err := dockerCmdWithError(c, "run", "--name", "nonzero1", "busybox", "false"); err == nil {
 		c.Fatal("Should fail.", out, err)
 	}
 
@@ -347,8 +346,7 @@ func (s *DockerSuite) TestPsListContainersFilterExited(c *check.C) {
 		c.Fatal(err)
 	}
 
-	runCmd = exec.Command(dockerBinary, "run", "--name", "nonzero2", "busybox", "false")
-	if out, _, err := runCommandWithOutput(runCmd); err == nil {
+	if out, _, err := dockerCmdWithError(c, "run", "--name", "nonzero2", "busybox", "false"); err == nil {
 		c.Fatal("Should fail.", out, err)
 	}
 	secondNonZero, err := getIDByName("nonzero2")
@@ -385,42 +383,25 @@ func (s *DockerSuite) TestPsListContainersFilterExited(c *check.C) {
 
 func (s *DockerSuite) TestPsRightTagName(c *check.C) {
 	tag := "asybox:shmatest"
-	if out, err := exec.Command(dockerBinary, "tag", "busybox", tag).CombinedOutput(); err != nil {
-		c.Fatalf("Failed to tag image: %s, out: %q", err, out)
-	}
+	dockerCmd(c, "tag", "busybox", tag)
 
 	var id1 string
-	if out, err := exec.Command(dockerBinary, "run", "-d", "busybox", "top").CombinedOutput(); err != nil {
-		c.Fatalf("Failed to run container: %s, out: %q", err, out)
-	} else {
-		id1 = strings.TrimSpace(string(out))
-	}
+	out, _ := dockerCmd(c, "run", "-d", "busybox", "top")
+	id1 = strings.TrimSpace(string(out))
 
 	var id2 string
-	if out, err := exec.Command(dockerBinary, "run", "-d", tag, "top").CombinedOutput(); err != nil {
-		c.Fatalf("Failed to run container: %s, out: %q", err, out)
-	} else {
-		id2 = strings.TrimSpace(string(out))
-	}
+	out, _ = dockerCmd(c, "run", "-d", tag, "top")
+	id2 = strings.TrimSpace(string(out))
 
 	var imageID string
-	if out, err := exec.Command(dockerBinary, "inspect", "-f", "{{.Id}}", "busybox").CombinedOutput(); err != nil {
-		c.Fatalf("failed to get the image ID of busybox: %s, %v", out, err)
-	} else {
-		imageID = strings.TrimSpace(string(out))
-	}
+	out, _ = dockerCmd(c, "inspect", "-f", "{{.Id}}", "busybox")
+	imageID = strings.TrimSpace(string(out))
 
 	var id3 string
-	if out, err := exec.Command(dockerBinary, "run", "-d", imageID, "top").CombinedOutput(); err != nil {
-		c.Fatalf("Failed to run container: %s, out: %q", err, out)
-	} else {
-		id3 = strings.TrimSpace(string(out))
-	}
+	out, _ = dockerCmd(c, "run", "-d", imageID, "top")
+	id3 = strings.TrimSpace(string(out))
 
-	out, err := exec.Command(dockerBinary, "ps", "--no-trunc").CombinedOutput()
-	if err != nil {
-		c.Fatalf("Failed to run 'ps': %s, out: %q", err, out)
-	}
+	out, _ = dockerCmd(c, "ps", "--no-trunc")
 	lines := strings.Split(strings.TrimSpace(string(out)), "\n")
 	// skip header
 	lines = lines[1:]
@@ -449,16 +430,10 @@ func (s *DockerSuite) TestPsRightTagName(c *check.C) {
 }
 
 func (s *DockerSuite) TestPsLinkedWithNoTrunc(c *check.C) {
-	if out, err := exec.Command(dockerBinary, "run", "--name=first", "-d", "busybox", "top").CombinedOutput(); err != nil {
-		c.Fatalf("Output: %s, err: %s", out, err)
-	}
-	if out, err := exec.Command(dockerBinary, "run", "--name=second", "--link=first:first", "-d", "busybox", "top").CombinedOutput(); err != nil {
-		c.Fatalf("Output: %s, err: %s", out, err)
-	}
-	out, err := exec.Command(dockerBinary, "ps", "--no-trunc").CombinedOutput()
-	if err != nil {
-		c.Fatalf("Output: %s, err: %s", out, err)
-	}
+	dockerCmd(c, "run", "--name=first", "-d", "busybox", "top")
+	dockerCmd(c, "run", "--name=second", "--link=first:first", "-d", "busybox", "top")
+
+	out, _ := dockerCmd(c, "ps", "--no-trunc")
 	lines := strings.Split(strings.TrimSpace(string(out)), "\n")
 	// strip header
 	lines = lines[1:]
@@ -488,14 +463,9 @@ func (s *DockerSuite) TestPsGroupPortRange(c *check.C) {
 }
 
 func (s *DockerSuite) TestPsWithSize(c *check.C) {
-	out, _, err := runCommandWithOutput(exec.Command(dockerBinary, "run", "-d", "--name", "sizetest", "busybox", "top"))
-	if err != nil {
-		c.Fatal(out, err)
-	}
-	out, _, err = runCommandWithOutput(exec.Command(dockerBinary, "ps", "--size"))
-	if err != nil {
-		c.Fatal(out, err)
-	}
+	dockerCmd(c, "run", "-d", "--name", "sizetest", "busybox", "top")
+
+	out, _ := dockerCmd(c, "ps", "--size")
 	if !strings.Contains(out, "virtual") {
 		c.Fatalf("docker ps with --size should show virtual size of container")
 	}
@@ -503,28 +473,18 @@ func (s *DockerSuite) TestPsWithSize(c *check.C) {
 
 func (s *DockerSuite) TestPsListContainersFilterCreated(c *check.C) {
 	// create a container
-	createCmd := exec.Command(dockerBinary, "create", "busybox")
-	out, _, err := runCommandWithOutput(createCmd)
-	if err != nil {
-		c.Fatal(out, err)
-	}
+	out, _ := dockerCmd(c, "create", "busybox")
 	cID := strings.TrimSpace(out)
 	shortCID := cID[:12]
 
 	// Make sure it DOESN'T show up w/o a '-a' for normal 'ps'
-	runCmd := exec.Command(dockerBinary, "ps", "-q")
-	if out, _, err = runCommandWithOutput(runCmd); err != nil {
-		c.Fatal(out, err)
-	}
+	out, _ = dockerCmd(c, "ps", "-q")
 	if strings.Contains(out, shortCID) {
 		c.Fatalf("Should have not seen '%s' in ps output:\n%s", shortCID, out)
 	}
 
 	// Make sure it DOES show up as 'Created' for 'ps -a'
-	runCmd = exec.Command(dockerBinary, "ps", "-a")
-	if out, _, err = runCommandWithOutput(runCmd); err != nil {
-		c.Fatal(out, err)
-	}
+	out, _ = dockerCmd(c, "ps", "-a")
 
 	hits := 0
 	for _, line := range strings.Split(out, "\n") {
@@ -542,10 +502,7 @@ func (s *DockerSuite) TestPsListContainersFilterCreated(c *check.C) {
 	}
 
 	// filter containers by 'create' - note, no -a needed
-	runCmd = exec.Command(dockerBinary, "ps", "-q", "-f", "status=created")
-	if out, _, err = runCommandWithOutput(runCmd); err != nil {
-		c.Fatal(out, err)
-	}
+	out, _ = dockerCmd(c, "ps", "-q", "-f", "status=created")
 	containerOut := strings.TrimSpace(out)
 	if !strings.HasPrefix(cID, containerOut) {
 		c.Fatalf("Expected id %s, got %s for filter, out: %s", cID, containerOut, out)

integration-cli/docker_cli_pull_test.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"fmt"
-	"os/exec"
 	"strings"
 
 	"github.com/go-check/check"
@@ -19,30 +18,19 @@ func (s *DockerRegistrySuite) TestPullImageWithAliases(c *check.C) {
 
 	// Tag and push the same image multiple times.
 	for _, repo := range repos {
-		if out, _, err := runCommandWithOutput(exec.Command(dockerBinary, "tag", "busybox", repo)); err != nil {
-			c.Fatalf("Failed to tag image %v: error %v, output %q", repos, err, out)
-		}
-		if out, err := exec.Command(dockerBinary, "push", repo).CombinedOutput(); err != nil {
-			c.Fatalf("Failed to push image %v: error %v, output %q", repo, err, string(out))
-		}
+		dockerCmd(c, "tag", "busybox", repo)
+		dockerCmd(c, "push", repo)
 	}
 
 	// Clear local images store.
 	args := append([]string{"rmi"}, repos...)
-	if out, err := exec.Command(dockerBinary, args...).CombinedOutput(); err != nil {
-		c.Fatalf("Failed to clean images: error %v, output %q", err, string(out))
-	}
+	dockerCmd(c, args...)
 
 	// Pull a single tag and verify it doesn't bring down all aliases.
-	pullCmd := exec.Command(dockerBinary, "pull", repos[0])
-	if out, _, err := runCommandWithOutput(pullCmd); err != nil {
-		c.Fatalf("Failed to pull %v: error %v, output %q", repoName, err, out)
-	}
-	if err := exec.Command(dockerBinary, "inspect", repos[0]).Run(); err != nil {
-		c.Fatalf("Image %v was not pulled down", repos[0])
-	}
+	dockerCmd(c, "pull", repos[0])
+	dockerCmd(c, "inspect", repos[0])
 	for _, repo := range repos[1:] {
-		if err := exec.Command(dockerBinary, "inspect", repo).Run(); err == nil {
+		if _, _, err := dockerCmdWithError(c, "inspect", repo); err == nil {
 			c.Fatalf("Image %v shouldn't have been pulled down", repo)
 		}
 	}
@@ -59,8 +47,7 @@ func (s *DockerSuite) TestPullVerified(c *check.C) {
 
 	// pull it
 	expected := "The image you are pulling has been verified"
-	pullCmd := exec.Command(dockerBinary, "pull", verifiedName)
-	if out, exitCode, err := runCommandWithOutput(pullCmd); err != nil || !strings.Contains(out, expected) {
+	if out, exitCode, err := dockerCmdWithError(c, "pull", verifiedName); err != nil || !strings.Contains(out, expected) {
 		if err != nil || exitCode != 0 {
 			c.Skip(fmt.Sprintf("pulling the '%s' image from the registry has failed: %v", verifiedName, err))
 		}
@@ -68,8 +55,7 @@ func (s *DockerSuite) TestPullVerified(c *check.C) {
 	}
 
 	// pull it again
-	pullCmd = exec.Command(dockerBinary, "pull", verifiedName)
-	if out, exitCode, err := runCommandWithOutput(pullCmd); err != nil || strings.Contains(out, expected) {
+	if out, exitCode, err := dockerCmdWithError(c, "pull", verifiedName); err != nil || strings.Contains(out, expected) {
 		if err != nil || exitCode != 0 {
 			c.Skip(fmt.Sprintf("pulling the '%s' image from the registry has failed: %v", verifiedName, err))
 		}
@@ -82,10 +68,7 @@ func (s *DockerSuite) TestPullVerified(c *check.C) {
 func (s *DockerSuite) TestPullImageFromCentralRegistry(c *check.C) {
 	testRequires(c, Network)
 
-	pullCmd := exec.Command(dockerBinary, "pull", "hello-world")
-	if out, _, err := runCommandWithOutput(pullCmd); err != nil {
-		c.Fatalf("pulling the hello-world image from the registry has failed: %s, %v", out, err)
-	}
+	dockerCmd(c, "pull", "hello-world")
 }
 
 // pulling a non-existing image from the central registry should return a non-zero exit code
@@ -93,8 +76,7 @@ func (s *DockerSuite) TestPullNonExistingImage(c *check.C) {
 	testRequires(c, Network)
 
 	name := "sadfsadfasdf"
-	pullCmd := exec.Command(dockerBinary, "pull", name)
-	out, _, err := runCommandWithOutput(pullCmd)
+	out, _, err := dockerCmdWithError(c, "pull", name)
 
 	if err == nil || !strings.Contains(out, fmt.Sprintf("Error: image library/%s:latest not found", name)) {
 		c.Fatalf("expected non-zero exit status when pulling non-existing image: %s", out)
@@ -114,19 +96,15 @@ func (s *DockerSuite) TestPullImageOfficialNames(c *check.C) {
 		"index.docker.io/library/hello-world",
 	}
 	for _, name := range names {
-		pullCmd := exec.Command(dockerBinary, "pull", name)
-		out, exitCode, err := runCommandWithOutput(pullCmd)
+		out, exitCode, err := dockerCmdWithError(c, "pull", name)
 		if err != nil || exitCode != 0 {
 			c.Errorf("pulling the '%s' image from the registry has failed: %s", name, err)
 			continue
 		}
 
 		// ensure we don't have multiple image names.
-		imagesCmd := exec.Command(dockerBinary, "images")
-		out, _, err = runCommandWithOutput(imagesCmd)
-		if err != nil {
-			c.Errorf("listing images failed with errors: %v", err)
-		} else if strings.Contains(out, name) {
+		out, _ = dockerCmd(c, "images")
+		if strings.Contains(out, name) {
 			c.Errorf("images should not have listed '%s'", name)
 		}
 	}
@@ -135,8 +113,7 @@ func (s *DockerSuite) TestPullImageOfficialNames(c *check.C) {
 func (s *DockerSuite) TestPullScratchNotAllowed(c *check.C) {
 	testRequires(c, Network)
 
-	pullCmd := exec.Command(dockerBinary, "pull", "scratch")
-	out, exitCode, err := runCommandWithOutput(pullCmd)
+	out, exitCode, err := dockerCmdWithError(c, "pull", "scratch")
 	if err == nil {
 		c.Fatal("expected pull of scratch to fail, but it didn't")
 	}
@@ -153,38 +130,24 @@ func (s *DockerSuite) TestPullScratchNotAllowed(c *check.C) {
 
 // pulling an image with --all-tags=true
 func (s *DockerSuite) TestPullImageWithAllTagFromCentralRegistry(c *check.C) {
-	//testRequires(c, Network)
-	pullCmd := exec.Command(dockerBinary, "pull", "busybox")
-	if out, _, err := runCommandWithOutput(pullCmd); err != nil {
-		c.Fatalf("pulling the busybox image from the registry has failed: %s, %v", out, err)
-	}
+	testRequires(c, Network)
 
-	ImageCmd := exec.Command(dockerBinary, "images", "busybox")
-	outImageCmd, _, err := runCommandWithOutput(ImageCmd)
+	dockerCmd(c, "pull", "busybox")
 
-	c.Assert(err, check.IsNil)
+	outImageCmd, _ := dockerCmd(c, "images", "busybox")
 
-	pullAllTagCmd := exec.Command(dockerBinary, "pull", "--all-tags=true", "busybox")
-	if out, _, err := runCommandWithOutput(pullAllTagCmd); err != nil {
-		c.Fatalf("pulling the busybox image with all tags from the registry has failed: %s, %v", out, err)
-	}
+	dockerCmd(c, "pull", "--all-tags=true", "busybox")
 
-	ImageCmd1 := exec.Command(dockerBinary, "images", "busybox")
-	outImageAllTagCmd, _, err := runCommandWithOutput(ImageCmd1)
-	c.Assert(err, check.IsNil)
+	outImageAllTagCmd, _ := dockerCmd(c, "images", "busybox")
 
 	if strings.Count(outImageCmd, "busybox") >= strings.Count(outImageAllTagCmd, "busybox") {
 		c.Fatalf("Pulling with all tags should get more images")
 	}
 
-	pullAllTagCmd = exec.Command(dockerBinary, "pull", "-a", "busybox")
-	if out, _, err := runCommandWithOutput(pullAllTagCmd); err != nil {
-		c.Fatalf("pulling the busybox image with all tags from the registry has failed: %s, %v", out, err)
-	}
+	// FIXME has probably no effect (tags already pushed)
+	dockerCmd(c, "pull", "-a", "busybox")
 
-	ImageCmd2 := exec.Command(dockerBinary, "images", "busybox")
-	outImageAllTagCmd, _, err = runCommandWithOutput(ImageCmd2)
-	c.Assert(err, check.IsNil)
+	outImageAllTagCmd, _ = dockerCmd(c, "images", "busybox")
 
 	if strings.Count(outImageCmd, "busybox") >= strings.Count(outImageAllTagCmd, "busybox") {
 		c.Fatalf("Pulling with all tags should get more images")

integration-cli/docker_cli_push_test.go

@@ -16,21 +16,14 @@ import (
 func (s *DockerRegistrySuite) TestPushBusyboxImage(c *check.C) {
 	repoName := fmt.Sprintf("%v/dockercli/busybox", privateRegistryURL)
 	// tag the image to upload it to the private registry
-	tagCmd := exec.Command(dockerBinary, "tag", "busybox", repoName)
-	if out, _, err := runCommandWithOutput(tagCmd); err != nil {
-		c.Fatalf("image tagging failed: %s, %v", out, err)
-	}
-
-	pushCmd := exec.Command(dockerBinary, "push", repoName)
-	if out, _, err := runCommandWithOutput(pushCmd); err != nil {
-		c.Fatalf("pushing the image to the private registry has failed: %s, %v", out, err)
-	}
+	dockerCmd(c, "tag", "busybox", repoName)
+	// push the image to the registry
+	dockerCmd(c, "push", repoName)
 }
 
 // pushing an image without a prefix should throw an error
 func (s *DockerSuite) TestPushUnprefixedRepo(c *check.C) {
-	pushCmd := exec.Command(dockerBinary, "push", "busybox")
-	if out, _, err := runCommandWithOutput(pushCmd); err == nil {
+	if out, _, err := dockerCmdWithError(c, "push", "busybox"); err == nil {
 		c.Fatalf("pushing an unprefixed repo didn't result in a non-zero exit status: %s", out)
 	}
 }
@@ -39,8 +32,7 @@ func (s *DockerRegistrySuite) TestPushUntagged(c *check.C) {
 	repoName := fmt.Sprintf("%v/dockercli/busybox", privateRegistryURL)
 
 	expected := "Repository does not exist"
-	pushCmd := exec.Command(dockerBinary, "push", repoName)
-	if out, _, err := runCommandWithOutput(pushCmd); err == nil {
+	if out, _, err := dockerCmdWithError(c, "push", repoName); err == nil {
 		c.Fatalf("pushing the image to the private registry should have failed: output %q", out)
 	} else if !strings.Contains(out, expected) {
 		c.Fatalf("pushing the image failed with an unexpected message: expected %q, got %q", expected, out)
@@ -51,8 +43,8 @@ func (s *DockerRegistrySuite) TestPushBadTag(c *check.C) {
 	repoName := fmt.Sprintf("%v/dockercli/busybox:latest", privateRegistryURL)
 
 	expected := "does not exist"
-	pushCmd := exec.Command(dockerBinary, "push", repoName)
-	if out, _, err := runCommandWithOutput(pushCmd); err == nil {
+
+	if out, _, err := dockerCmdWithError(c, "push", repoName); err == nil {
 		c.Fatalf("pushing the image to the private registry should have failed: output %q", out)
 	} else if !strings.Contains(out, expected) {
 		c.Fatalf("pushing the image failed with an unexpected message: expected %q, got %q", expected, out)
@@ -64,27 +56,17 @@ func (s *DockerRegistrySuite) TestPushMultipleTags(c *check.C) {
 	repoTag1 := fmt.Sprintf("%v/dockercli/busybox:t1", privateRegistryURL)
 	repoTag2 := fmt.Sprintf("%v/dockercli/busybox:t2", privateRegistryURL)
 	// tag the image and upload it to the private registry
-	tagCmd1 := exec.Command(dockerBinary, "tag", "busybox", repoTag1)
-	if out, _, err := runCommandWithOutput(tagCmd1); err != nil {
-		c.Fatalf("image tagging failed: %s, %v", out, err)
-	}
-	tagCmd2 := exec.Command(dockerBinary, "tag", "busybox", repoTag2)
-	if out, _, err := runCommandWithOutput(tagCmd2); err != nil {
-		c.Fatalf("image tagging failed: %s, %v", out, err)
-	}
+	dockerCmd(c, "tag", "busybox", repoTag1)
 
-	pushCmd := exec.Command(dockerBinary, "push", repoName)
-	if out, _, err := runCommandWithOutput(pushCmd); err != nil {
-		c.Fatalf("pushing the image to the private registry has failed: %s, %v", out, err)
-	}
+	dockerCmd(c, "tag", "busybox", repoTag2)
+
+	dockerCmd(c, "push", repoName)
 }
 
 func (s *DockerRegistrySuite) TestPushInterrupt(c *check.C) {
 	repoName := fmt.Sprintf("%v/dockercli/busybox", privateRegistryURL)
 	// tag the image and upload it to the private registry
-	if out, _, err := runCommandWithOutput(exec.Command(dockerBinary, "tag", "busybox", repoName)); err != nil {
-		c.Fatalf("image tagging failed: %s, %v", out, err)
-	}
+	dockerCmd(c, "tag", "busybox", repoName)
 
 	pushCmd := exec.Command(dockerBinary, "push", repoName)
 	if err := pushCmd.Start(); err != nil {
@@ -96,7 +78,7 @@ func (s *DockerRegistrySuite) TestPushInterrupt(c *check.C) {
 	if err := pushCmd.Process.Kill(); err != nil {
 		c.Fatalf("Failed to kill push process: %v", err)
 	}
-	if out, _, err := runCommandWithOutput(exec.Command(dockerBinary, "push", repoName)); err == nil {
+	if out, _, err := dockerCmdWithError(c, "push", repoName); err == nil {
 		str := string(out)
 		if !strings.Contains(str, "already in progress") {
 			c.Fatalf("Push should be continued on daemon side, but seems ok: %v, %s", err, out)
@@ -133,8 +115,7 @@ func (s *DockerRegistrySuite) TestPushEmptyLayer(c *check.C) {
 	}
 
 	// Now verify we can push it
-	pushCmd := exec.Command(dockerBinary, "push", repoName)
-	if out, _, err := runCommandWithOutput(pushCmd); err != nil {
+	if out, _, err := dockerCmdWithError(c, "push", repoName); err != nil {
 		c.Fatalf("pushing the image to the private registry has failed: %s, %v", out, err)
 	}
 }