Do not create cache folder if no-cache option

django_migration_linter/migration.py

@@ -1,12 +1,21 @@
-from django_migration_linter.utils import split_migration_path
-
-
-class Migration(object):
-    def __init__(self, abs_path):
-        self.abs_path = abs_path
-        self.app_name, self.name = split_migration_path(self.abs_path)
-
-    def __lt__(self, other):
-        if not isinstance(other, Migration):
-            return NotImplemented
-        return self.abs_path < other.abs_path
+import hashlib
+
+from django_migration_linter.utils import split_migration_path
+
+
+class Migration(object):
+    def __init__(self, abs_path):
+        self.abs_path = abs_path
+        self.app_name, self.name = split_migration_path(self.abs_path)
+
+    def __lt__(self, other):
+        if not isinstance(other, Migration):
+            return NotImplemented
+        return self.abs_path < other.abs_path
+
+    def get_md5hash(self):
+        hash_md5 = hashlib.md5()
+        with open(self.abs_path, "rb") as f:
+            for chunk in iter(lambda: f.read(4096), b""):
+                hash_md5.update(chunk)
+        return hash_md5.hexdigest()