Only trim quotes from exported env var if there are quotes

exports.go

@@ -11,7 +11,7 @@ func DumpExportsFile(exportsData, envDir string) error {
 
 	for _, line := range lines {
 		if found, key, value := ParseExportsFileLine(line); found {
-			err := WriteEnvFile(envDir, key, value[1 : len(value)-1])
+			err := WriteEnvFile(envDir, key, value)
 			if err != nil {
 				return err
 			}
@@ -24,7 +24,11 @@ func ParseExportsFileLine(line string) (bool, string, string) {
 	components := strings.Split(line, "=")
 	export := strings.Split(components[0], " ")
 	if strings.TrimSpace(export[0]) == "export" {
-		return true, strings.TrimSpace(export[1]), components[1]
+		val := strings.TrimSpace(components[1])
+		if string(val[0]) == "\"" && string(val[len(val)-1]) == "\"" {
+			val = val[1: len(val)-1]
+		}
+		return true, strings.TrimSpace(export[1]), val
 	} else {
 		return false, "", ""
 	}

exports_test.go

@@ -51,6 +51,52 @@ export FOO=bar
 		t.Error(err.Error())
 	}
 
+	if strings.TrimSpace(string(actual)) != expected {
+		t.Errorf("Expected %s; got %s", expected, actual)
+	}
+}
+
+func TestDumpExportsFileWithQuotes(t *testing.T) {
+	envDir, err := ioutil.TempDir("", "env")
+
+	exports := `
+export FOO="bar"
+`
+	err = cnbshim.DumpExportsFile(exports, envDir)
+	if err != nil {
+		t.Error(err.Error())
+	}
+
+	expectedFile := filepath.Join(envDir, "FOO")
+	expected := "bar"
+	actual, err := ioutil.ReadFile(expectedFile)
+	if err != nil {
+		t.Error(err.Error())
+	}
+
+	if strings.TrimSpace(string(actual)) != expected {
+		t.Errorf("Expected %s; got %s", expected, actual)
+	}
+}
+
+func TestDumpExportsFileWithEscapedQuotes(t *testing.T) {
+	envDir, err := ioutil.TempDir("", "env")
+
+	exports := `
+export FOO="b\"a\"r"
+`
+	err = cnbshim.DumpExportsFile(exports, envDir)
+	if err != nil {
+		t.Error(err.Error())
+	}
+
+	expectedFile := filepath.Join(envDir, "FOO")
+	expected := "b\\\"a\\\"r"
+	actual, err := ioutil.ReadFile(expectedFile)
+	if err != nil {
+		t.Error(err.Error())
+	}
+
 	if strings.TrimSpace(string(actual)) != expected {
 		t.Errorf("Expected %s; got %s", expected, actual)
 	}