Check for no Cmd on exec create endpoint

Fixes #9414

Signed-off-by: Brian Goff <cpuguy83@gmail.com>

integration-cli/docker_api_containers_test.go

@@ -23,7 +23,7 @@ func TestContainerApiGetAll(t *testing.T) {
 		t.Fatalf("Error on container creation: %v, output: %q", err, out)
 	}
 
-	body, err := sockRequest("GET", "/containers/json?all=1")
+	body, err := sockRequest("GET", "/containers/json?all=1", nil)
 	if err != nil {
 		t.Fatalf("GET all containers sockRequest failed: %v", err)
 	}
@@ -56,7 +56,7 @@ func TestContainerApiGetExport(t *testing.T) {
 		t.Fatalf("Error on container creation: %v, output: %q", err, out)
 	}
 
-	body, err := sockRequest("GET", "/containers/"+name+"/export")
+	body, err := sockRequest("GET", "/containers/"+name+"/export", nil)
 	if err != nil {
 		t.Fatalf("GET containers/export sockRequest failed: %v", err)
 	}
@@ -92,7 +92,7 @@ func TestContainerApiGetChanges(t *testing.T) {
 		t.Fatalf("Error on container creation: %v, output: %q", err, out)
 	}
 
-	body, err := sockRequest("GET", "/containers/"+name+"/changes")
+	body, err := sockRequest("GET", "/containers/"+name+"/changes", nil)
 	if err != nil {
 		t.Fatalf("GET containers/changes sockRequest failed: %v", err)
 	}

integration-cli/docker_api_exec_test.go

@@ -0,0 +1,25 @@
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"os/exec"
+	"testing"
+)
+
+// Regression test for #9414
+func TestExecApiCreateNoCmd(t *testing.T) {
+	defer deleteAllContainers()
+	name := "exec_test"
+	runCmd := exec.Command(dockerBinary, "run", "-d", "-t", "--name", name, "busybox", "/bin/sh")
+	if out, _, err := runCommandWithOutput(runCmd); err != nil {
+		t.Fatal(out, err)
+	}
+
+	body, err := sockRequest("POST", fmt.Sprintf("/containers/%s/exec", name), map[string]interface{}{"Cmd": nil})
+	if err == nil || !bytes.Contains(body, []byte("No exec command specified")) {
+		t.Fatalf("Expected error when creating exec command with no Cmd specified: %q", err)
+	}
+
+	logDone("exec create API - returns error when missing Cmd")
+}

integration-cli/docker_api_inspect_test.go

@@ -24,7 +24,7 @@ func TestInspectApiContainerResponse(t *testing.T) {
 		if testVersion != "latest" {
 			endpoint = "/" + testVersion + endpoint
 		}
-		body, err := sockRequest("GET", endpoint)
+		body, err := sockRequest("GET", endpoint, nil)
 		if err != nil {
 			t.Fatalf("sockRequest failed for %s version: %v", testVersion, err)
 		}

integration-cli/docker_api_resize_test.go

@@ -16,7 +16,7 @@ func TestResizeApiResponse(t *testing.T) {
 	cleanedContainerID := stripTrailingCharacters(out)
 
 	endpoint := "/containers/" + cleanedContainerID + "/resize?h=40&w=40"
-	_, err = sockRequest("POST", endpoint)
+	_, err = sockRequest("POST", endpoint, nil)
 	if err != nil {
 		t.Fatalf("resize Request failed %v", err)
 	}
@@ -41,7 +41,7 @@ func TestResizeApiResponseWhenContainerNotStarted(t *testing.T) {
 	}
 
 	endpoint := "/containers/" + cleanedContainerID + "/resize?h=40&w=40"
-	body, err := sockRequest("POST", endpoint)
+	body, err := sockRequest("POST", endpoint, nil)
 	if err == nil {
 		t.Fatalf("resize should fail when container is not started")
 	}

integration-cli/docker_utils.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"bytes"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
@@ -249,7 +251,7 @@ func (d *Daemon) Cmd(name string, arg ...string) (string, error) {
 	return string(b), err
 }
 
-func sockRequest(method, endpoint string) ([]byte, error) {
+func sockRequest(method, endpoint string, data interface{}) ([]byte, error) {
 	// FIX: the path to sock should not be hardcoded
 	sock := filepath.Join("/", "var", "run", "docker.sock")
 	c, err := net.DialTimeout("unix", sock, time.Duration(10*time.Second))
@@ -260,7 +262,12 @@ func sockRequest(method, endpoint string) ([]byte, error) {
 	client := httputil.NewClientConn(c, nil)
 	defer client.Close()
 
-	req, err := http.NewRequest(method, endpoint, nil)
+	jsonData := bytes.NewBuffer(nil)
+	if err := json.NewEncoder(jsonData).Encode(data); err != nil {
+		return nil, err
+	}
+
+	req, err := http.NewRequest(method, endpoint, jsonData)
 	req.Header.Set("Content-Type", "application/json")
 	if err != nil {
 		return nil, fmt.Errorf("could not create new request: %v", err)