Added a quick and dirty file open check

util/file.go

@@ -1,6 +1,7 @@
 package util
 
 import (
+  "os/exec"
   "path"
   "strings"
 )
@@ -8,3 +9,14 @@ import (
 func FilenameWithoutExtension(filename string) string {
   return strings.TrimSuffix(filename, path.Ext(filename))
 }
+
+func IsFileLocked(filepath string) bool {
+  cmd := exec.Command("/usr/bin/lsof", filepath)
+  stdout, _ := cmd.Output()
+
+  if strings.Contains(string(stdout), filepath) {
+    return true
+  }
+
+  return false
+}