Fix issue16 (#21)

* add line to dl4006

* fix bug dl4006

linter/rules/dl4006.go

@@ -14,12 +14,20 @@ func validateDL4006(node *parser.Node) (rst []ValidateResult, err error) {
 		case SHELL:
 			isShellPipeFail = true
 		case RUN:
+			var isInQuote bool
 			for _, v := range strings.Fields(child.Next.Value) {
 				switch v {
 				case "|":
-					if !isShellPipeFail {
+					if !isInQuote && !isShellPipeFail {
 						rst = append(rst, ValidateResult{line: child.StartLine})
 					}
+				default:
+					if strings.HasPrefix(v, "'") {
+						isInQuote = true
+					}
+					if strings.HasSuffix(v, "'") {
+						isInQuote = false
+					}
 				}
 			}
 		}

linter/rules/dl4006_test.go

@@ -21,6 +21,13 @@ func TestValidateDL4006(t *testing.T) {
 		{
 			dockerfileStr: `SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 RUN wget -O - https://some.site | wc -l > /number
+`,
+			expectedRst: nil,
+			expectedErr: nil,
+		},
+		{
+			dockerfileStr: `SHELL ["/bin/bash", "-o", "pipefail", "-c"]
+RUN yq eval '.".docker".script[1] | explode(.)' /base.yml > /usr/local/bin/entrypoint
 `,
 			expectedRst: nil,
 			expectedErr: nil,

testdata/DL4006_Dockerfile

@@ -1 +1,2 @@
-RUN wget -O - https://some.site | wc -l > /number
+RUN wget -O - https://some.site | wc -l > /number
+RUN yq eval '.".docker".script[1] | explode(.)' /base.yml > /usr/local/bin/entrypoint