Support arguments in post render

Signed-off-by: Jan-Otto Kröpke <joe@adorsys.de>

pkg/postrender/exec.go

@@ -21,8 +21,8 @@ import (
 	"io"
 	"os/exec"
 	"path/filepath"
-	"strings"
 
+	"github.com/mattn/go-shellwords"
 	"github.com/pkg/errors"
 )
 
@@ -36,7 +36,15 @@ type execRender struct {
 // contain any separators, it will search in $PATH, otherwise it will resolve
 // any relative paths to a fully qualified path
 func NewExec(command string) (PostRenderer, error) {
-	commandList := strings.Split(command, " ")
+	parser := shellwords.NewParser()
+	parser.ParseEnv = false
+	parser.ParseBacktick = false
+
+	commandList, err := parser.Parse(command)
+	if err != nil {
+		return nil, err
+	}
+
 	binaryPath, args := commandList[0], commandList[1:]
 
 	fullPath, err := getFullPath(binaryPath)

pkg/postrender/exec_test.go

@@ -22,6 +22,7 @@ import (
 	"os"
 	"path/filepath"
 	"runtime"
+	"strings"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -37,7 +38,7 @@ sed s/FOOTEST/${1:-BARTEST}/g <&0
 func TestGetFullPath(t *testing.T) {
 	is := assert.New(t)
 	t.Run("full path resolves correctly", func(t *testing.T) {
-		testpath, cleanup := setupTestingScript(t)
+		testpath, cleanup := setupTestingScript(t, "post-render-test.sh")
 		defer cleanup()
 
 		fullPath, err := getFullPath(testpath)
@@ -46,7 +47,7 @@ func TestGetFullPath(t *testing.T) {
 	})
 
 	t.Run("relative path resolves correctly", func(t *testing.T) {
-		testpath, cleanup := setupTestingScript(t)
+		testpath, cleanup := setupTestingScript(t, "post-render-test.sh")
 		defer cleanup()
 
 		currentDir, err := os.Getwd()
@@ -59,7 +60,7 @@ func TestGetFullPath(t *testing.T) {
 	})
 
 	t.Run("binary in PATH resolves correctly", func(t *testing.T) {
-		testpath, cleanup := setupTestingScript(t)
+		testpath, cleanup := setupTestingScript(t, "post-render-test.sh")
 		defer cleanup()
 
 		realPath := os.Getenv("PATH")
@@ -113,7 +114,7 @@ func TestExecRun(t *testing.T) {
 		t.Skip("skipping on windows")
 	}
 	is := assert.New(t)
-	testpath, cleanup := setupTestingScript(t)
+	testpath, cleanup := setupTestingScript(t, "post-render-test.sh")
 	defer cleanup()
 
 	renderer, err := NewExec(testpath)
@@ -130,7 +131,7 @@ func TestExecRunWithArgs(t *testing.T) {
 		t.Skip("skipping on windows")
 	}
 	is := assert.New(t)
-	testpath, cleanup := setupTestingScript(t)
+	testpath, cleanup := setupTestingScript(t, "post-render-test.sh")
 	defer cleanup()
 
 	renderer, err := NewExec(testpath + " ARGUMENT")
@@ -141,12 +142,47 @@ func TestExecRunWithArgs(t *testing.T) {
 	is.Contains(output.String(), "ARGUMENT")
 }
 
-func setupTestingScript(t *testing.T) (filepath string, cleanup func()) {
+func TestExecRunWithArgsAndSpaceInCommandUsingBackslash(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		// the actual Run test uses a basic sed example, so skip this test on windows
+		t.Skip("skipping on windows")
+	}
+	is := assert.New(t)
+	testpath, cleanup := setupTestingScript(t, "post render test.sh")
+	testpathEscaped := strings.ReplaceAll(testpath, " ", "\\ ")
+	defer cleanup()
+
+	renderer, err := NewExec(testpathEscaped + " ARGUMENT")
+	require.NoError(t, err)
+
+	output, err := renderer.Run(bytes.NewBufferString("FOOTEST"))
+	is.NoError(err)
+	is.Contains(output.String(), "ARGUMENT")
+}
+
+func TestExecRunWithArgsAndSpaceInCommandUsingQuotes(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		// the actual Run test uses a basic sed example, so skip this test on windows
+		t.Skip("skipping on windows")
+	}
+	is := assert.New(t)
+	testpath, cleanup := setupTestingScript(t, "post render test.sh")
+	defer cleanup()
+
+	renderer, err := NewExec("'" + testpath + "' ARGUMENT")
+	require.NoError(t, err)
+
+	output, err := renderer.Run(bytes.NewBufferString("FOOTEST"))
+	is.NoError(err)
+	is.Contains(output.String(), "ARGUMENT")
+}
+
+func setupTestingScript(t *testing.T, fileName string) (filepath string, cleanup func()) {
 	t.Helper()
 
 	tempdir := ensure.TempDir(t)
 
-	f, err := ioutil.TempFile(tempdir, "post-render-test.sh")
+	f, err := ioutil.TempFile(tempdir, fileName)
 	if err != nil {
 		t.Fatalf("unable to create tempfile for testing: %s", err)
 	}