move randomString() to a separate file, allowing build on macos

Signed-off-by: Predrag Rogic <prezha@users.noreply.github.com>

events/syscall/utils.go

@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: Apache-2.0
+/*
+Copyright (C) 2023 The Falco Authors.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package syscall
+
+import "math/rand/v2"
+
+// randomString generates a random string of the given length.
+func randomString(length int) string {
+	const charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+
+	bytes := make([]byte, length)
+
+	for i := range bytes {
+		bytes[i] = charset[rand.IntN(len(charset))]
+	}
+
+	return string(bytes)
+}

events/syscall/utils_linux.go

@@ -19,7 +19,6 @@ package syscall
 
 import (
 	"fmt"
-	"math/rand/v2"
 	"os"
 	"os/exec"
 	"os/user"
@@ -134,16 +133,3 @@ func createSshDirectoryUnderHome(h events.Helper) (string, func(), error) {
 		}
 	}, nil
 }
-
-// randomString generates a random string of the given length.
-func randomString(length int) string {
-	const charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
-
-	bytes := make([]byte, length)
-
-	for i := range bytes {
-		bytes[i] = charset[rand.IntN(len(charset))]
-	}
-
-	return string(bytes)
-}