BIND preview --expect-no-changes returns error even when no change

[aminvakil]

Describe the bug
I have a domain with two providers (CLOUDFLAREAPI and BIND) and bind has been excluded by default like this:

  "bind": {
    "TYPE": "BIND",
    "directory": "zones",
    "_exclude_from_defaults": "true"
  },

Starting with dnscontrol 4.27.1 dnscontrol preview --expect-no-changes always returns non-zero code even there has not been a change.

This only gets fixed when I create a file like this touch zones/example.com.zone, it does not care if the file is empty or full as it does not get checked as expected. but starting with 4.27.1 it returns error when there is no zones/example.com.zone.

This may not be related to bind though, but this is what's happening for me.

To Reproduce
Steps to reproduce the behavior:

1. Create a bind provider and exclude it from default, run dnscontrol preview --expect-no-changes even there is not a change.
2. See it returns non-zero code.
3. touch zones/example.com.zone
4. Run again and see it does not fail anymore.

Expected behavior
Ignore bind like before because it has been excluded.

DNS Provider

• CLOUDFLAREAPI
• BIND