initial version of cli integration tests

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
Upstream-commit: 6db32fdefdae49843ed9535b3af1099e6bd2755d
Component: engine

components/engine/integration-cli/utils.go

@@ -0,0 +1,109 @@
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"os/exec"
+	"strings"
+	"syscall"
+	"testing"
+)
+
+func getExitCode(err error) (int, error) {
+	exitCode := 0
+	if exiterr, ok := err.(*exec.ExitError); ok {
+		if procExit := exiterr.Sys().(syscall.WaitStatus); ok {
+			return procExit.ExitStatus(), nil
+		}
+	}
+	return exitCode, fmt.Errorf("failed to get exit code")
+}
+
+func runCommandWithOutput(cmd *exec.Cmd) (output string, exitCode int, err error) {
+	exitCode = 0
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		var exiterr error
+		if exitCode, exiterr = getExitCode(err); exiterr != nil {
+			// TODO: Fix this so we check the error's text.
+			// we've failed to retrieve exit code, so we set it to 127
+			exitCode = 127
+		}
+	}
+	output = string(out)
+	return
+}
+
+func runCommandWithStdoutStderr(cmd *exec.Cmd) (stdout string, stderr string, exitCode int, err error) {
+	exitCode = 0
+	var stderrBuffer bytes.Buffer
+	stderrPipe, err := cmd.StderrPipe()
+	if err != nil {
+		return "", "", -1, err
+	}
+	go io.Copy(&stderrBuffer, stderrPipe)
+	out, err := cmd.Output()
+
+	if err != nil {
+		var exiterr error
+		if exitCode, exiterr = getExitCode(err); exiterr != nil {
+			// TODO: Fix this so we check the error's text.
+			// we've failed to retrieve exit code, so we set it to 127
+			exitCode = 127
+		}
+	}
+	stdout = string(out)
+	stderr = string(stderrBuffer.Bytes())
+	return
+}
+
+func runCommand(cmd *exec.Cmd) (exitCode int, err error) {
+	exitCode = 0
+	err = cmd.Run()
+	if err != nil {
+		var exiterr error
+		if exitCode, exiterr = getExitCode(err); exiterr != nil {
+			// TODO: Fix this so we check the error's text.
+			// we've failed to retrieve exit code, so we set it to 127
+			exitCode = 127
+		}
+	}
+	return
+}
+
+func startCommand(cmd *exec.Cmd) (exitCode int, err error) {
+	exitCode = 0
+	err = cmd.Start()
+	if err != nil {
+		var exiterr error
+		if exitCode, exiterr = getExitCode(err); exiterr != nil {
+			// TODO: Fix this so we check the error's text.
+			// we've failed to retrieve exit code, so we set it to 127
+			exitCode = 127
+		}
+	}
+	return
+}
+
+func logDone(message string) {
+	fmt.Printf("[PASSED]: %s\n", message)
+}
+
+func stripTrailingCharacters(target string) string {
+	target = strings.Trim(target, "\n")
+	target = strings.Trim(target, " ")
+	return target
+}
+
+func errorOut(err error, t *testing.T, message string) {
+	if err != nil {
+		t.Fatal(message)
+	}
+}
+
+func errorOutOnNonNilError(err error, t *testing.T, message string) {
+	if err == nil {
+		t.Fatalf(message)
+	}
+}