fix: LABEL instruction compiled by Docker cannot be parsed

Fixes #16

Signed-off-by: Jeff MAURY <jmaury@redhat.com>

pkg/command/analyzer_test.go

@@ -0,0 +1,21 @@
+/*******************************************************************************
+ * Copyright (c) 2022 Red Hat, Inc.
+ * Distributed under license by Red Hat, Inc. All rights reserved.
+ * This program is made available under the terms of the
+ * Eclipse Public License v2.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v20.html
+ *
+ * Contributors:
+ * Red Hat, Inc.
+ ******************************************************************************/
+package command
+
+import "testing"
+
+func TestCheckNginx(t *testing.T) {
+	for _, tag := range []string{"1.25.0", "1.25.1", "1.25.2", "1.25.3"} {
+		t.Run(tag, func(t *testing.T) {
+			AnalyzeImage("docker.io/nginx:" + tag)
+		})
+	}
+}

pkg/decompiler/utils/utils.go

@@ -3,6 +3,7 @@ package utils
 import (
 	"github.com/moby/buildkit/frontend/dockerfile/parser"
 	"github.com/redhat-developer/docker-openshift-analyzer/pkg/utils"
+	"regexp"
 	"strings"
 )
 
@@ -26,21 +27,43 @@ var CONTAINERFILE_INSTRUCTIONS = []string{
 	utils.SHELL_INSTRUCTION,
 }
 
+var LABEL_PATTERN = regexp.MustCompile("^LABEL\\s+(.*)=(.*)$")
+
 func Line2Node(line string, root *parser.Node) error {
-	result, err := parser.Parse(strings.NewReader(line))
-	if err != nil {
-		return err
+	if strings.HasPrefix(line, utils.LABEL_INSTRUCTION) {
+		return parseLabel(line, root)
+	} else {
+		result, err := parser.Parse(strings.NewReader(line))
+		if err != nil {
+			return err
+		}
+		for _, node := range result.AST.Children {
+			root.AddChild(node, -1, -1)
+		}
+	}
+	return nil
+}
+
+func parseLabel(line string, root *parser.Node) error {
+	elements := LABEL_PATTERN.FindStringSubmatch(line)
+	parent := &parser.Node{
+		Value: "LABEL",
 	}
-	for _, node := range result.AST.Children {
-		root.AddChild(node, -1, -1)
+	node := parent
+	for _, element := range elements[1:] {
+		node.Next = &parser.Node{
+			Value: element,
+		}
+		node = node.Next
 	}
+	root.AddChild(parent, 0, 0)
 	return nil
 }
 
 func ExtractCmd(str string) string {
 	index := strings.Index(str, utils.NOP)
 	if index > 0 {
-		return str[index+len(utils.NOP):]
+		return strings.TrimSpace(str[index+len(utils.NOP):])
 	}
 	index = strings.Index(str, utils.RUN_PREFIX)
 	if index >= 0 {