ipxe should be done. untested currently

_base.py

@@ -102,8 +102,8 @@ class BaseUpdater(object):
             with open(_tmpfile, 'wb') as fh:
                 for chunk in req.iter_content(chunk_size = 8192):
                     fh.write(chunk)
-        realhash = self.getISOHash()
-        if realhash != self.new_hash:
+        realhash = self.getISOHash(_tmpfile)
+        if self.new_hash and realhash != self.new_hash:
             os.remove(_tmpfile)
             raise RuntimeError('Hash mismatch: {0} (LOCAL), {1} (REMOTE)'.format(realhash, self.new_hash))
         os.makedirs(os.path.dirname(self.dest_iso), exist_ok = True)
@@ -117,10 +117,14 @@ class BaseUpdater(object):
         raise RuntimeError('BaseUpdater should be subclassed and its updateVer, getCurVer, and getNewVer methods '
                            'should be replaced.')
 
-    def getISOHash(self):
+    def getISOHash(self, filepath = None):
+        if not filepath:
+            filepath = self.dest_iso
+        else:
+            filepath = os.path.abspath(os.path.expanduser(filepath))
         hasher = hashlib.new(self.hash_type)
         # TODO: later on when python 3.8 is more prevalent, https://stackoverflow.com/a/1131238/733214
-        with open(self.dest_iso, 'rb') as fh:
+        with open(filepath, 'rb') as fh:
             while True:
                 chunk = fh.read(8192)
                 if not chunk: