feat: add warning message for both blocklist and allowlist are set

pkg/envutil/envutil.go

@@ -42,23 +42,27 @@ var defaultBlockList = []string{
 	"_*", // Variables starting with underscore are typically internal
 }
 
-func getBlockList() []string {
+// getBlockList returns the list of environment variable patterns to be blocked.
+// The second return value indicates whether the list was explicitly set via LIMA_SHELLENV_BLOCK.
+func getBlockList() ([]string, bool) {
 	blockEnv := os.Getenv("LIMA_SHELLENV_BLOCK")
 	if blockEnv == "" {
-		return defaultBlockList
+		return defaultBlockList, false
 	}
 	after, found := strings.CutPrefix(blockEnv, "+")
 	if !found {
-		return parseEnvList(blockEnv)
+		return parseEnvList(blockEnv), true
 	}
-	return slices.Concat(defaultBlockList, parseEnvList(after))
+	return slices.Concat(defaultBlockList, parseEnvList(after)), true
 }
 
-func getAllowList() []string {
+// getAllowList returns the list of environment variable patterns to be allowed.
+// The second return value indicates whether the list was explicitly set via LIMA_SHELLENV_ALLOW.
+func getAllowList() ([]string, bool) {
 	if allowEnv := os.Getenv("LIMA_SHELLENV_ALLOW"); allowEnv != "" {
-		return parseEnvList(allowEnv)
+		return parseEnvList(allowEnv), true
 	}
-	return nil
+	return nil, false
 }
 
 func parseEnvList(envList string) []string {
@@ -92,10 +96,17 @@ func matchesAnyPattern(name string, patterns []string) bool {
 // It returns a slice of environment variables that are not blocked by the current configuration.
 // The filtering is controlled by LIMA_SHELLENV_BLOCK and LIMA_SHELLENV_ALLOW environment variables.
 func FilterEnvironment() []string {
+	allowList, isAllowListSet := getAllowList()
+	blockList, isBlockListSet := getBlockList()
+
+	if isBlockListSet && isAllowListSet {
+		logrus.Warn("Both LIMA_SHELLENV_BLOCK and LIMA_SHELLENV_ALLOW are set. Block list will be ignored.")
+		blockList = nil
+	}
 	return filterEnvironmentWithLists(
 		os.Environ(),
-		getAllowList(),
-		getBlockList(),
+		allowList,
+		blockList,
 	)
 }
 

pkg/envutil/envutil_test.go

@@ -88,9 +88,11 @@ func TestGetBlockAndAllowLists(t *testing.T) {
 		t.Setenv("LIMA_SHELLENV_BLOCK", "")
 		t.Setenv("LIMA_SHELLENV_ALLOW", "")
 
-		blockList := getBlockList()
-		allowList := getAllowList()
+		blockList, isBlockListSet := getBlockList()
+		allowList, isAllowListSet := getAllowList()
 
+		assert.Assert(t, !isBlockListSet)
+		assert.Assert(t, !isAllowListSet)
 		assert.Assert(t, isUsingDefaultBlockList())
 		assert.DeepEqual(t, blockList, defaultBlockList)
 		assert.Equal(t, len(allowList), 0)
@@ -99,7 +101,8 @@ func TestGetBlockAndAllowLists(t *testing.T) {
 	t.Run("custom blocklist", func(t *testing.T) {
 		t.Setenv("LIMA_SHELLENV_BLOCK", "PATH,HOME")
 
-		blockList := getBlockList()
+		blockList, isSet := getBlockList()
+		assert.Assert(t, isSet)
 		assert.Assert(t, !isUsingDefaultBlockList())
 		expected := []string{"PATH", "HOME"}
 		assert.DeepEqual(t, blockList, expected)
@@ -108,7 +111,8 @@ func TestGetBlockAndAllowLists(t *testing.T) {
 	t.Run("additive blocklist", func(t *testing.T) {
 		t.Setenv("LIMA_SHELLENV_BLOCK", "+CUSTOM_VAR")
 
-		blockList := getBlockList()
+		blockList, isSet := getBlockList()
+		assert.Assert(t, isSet)
 		assert.Assert(t, isUsingDefaultBlockList())
 		expected := slices.Concat(GetDefaultBlockList(), []string{"CUSTOM_VAR"})
 		assert.DeepEqual(t, blockList, expected)
@@ -117,7 +121,8 @@ func TestGetBlockAndAllowLists(t *testing.T) {
 	t.Run("allowlist", func(t *testing.T) {
 		t.Setenv("LIMA_SHELLENV_ALLOW", "FOO,BAR")
 
-		allowList := getAllowList()
+		allowList, isSet := getAllowList()
+		assert.Assert(t, isSet)
 		expected := []string{"FOO", "BAR"}
 		assert.DeepEqual(t, allowList, expected)
 	})