create_nojekyll_and_cname: clean-up CNAME file

I noticed that while running `pytest --random` and the extension
should wipe CNAME file if a configuration changes and it should
not be created.

Related: sphinx-doc#11285

sphinx/ext/githubpages.py

@@ -2,8 +2,8 @@
 
 from __future__ import annotations
 
-import os
 import urllib
+from pathlib import Path
 from typing import Any
 
 import sphinx
@@ -13,17 +13,18 @@
 
 def create_nojekyll_and_cname(app: Sphinx, env: BuildEnvironment) -> None:
  if app.builder.format == 'html':
- open(os.path.join(app.builder.outdir, '.nojekyll'), 'wb').close()
+ (Path(app.builder.outdir) / '.nojekyll').touch()
 
  html_baseurl = app.config.html_baseurl
- if html_baseurl:
- domain = urllib.parse.urlparse(html_baseurl).hostname
- if domain and not domain.endswith(".github.io"):
- with open(os.path.join(app.builder.outdir, 'CNAME'), 'w',
- encoding="utf-8") as f:
- # NOTE: don't write a trailing newline. The `CNAME` file that's
- # auto-generated by the Github UI doesn't have one.
- f.write(domain)
+ cname_path = Path(app.builder.outdir) / 'CNAME'
+ domain = urllib.parse.urlparse(html_baseurl).hostname if html_baseurl else None
+ if domain and not domain.endswith(".github.io"):
+ with cname_path.open('w', encoding="utf-8") as f:
+ # NOTE: don't write a trailing newline. The `CNAME` file that's
+ # auto-generated by the Github UI doesn't have one.
+ f.write(domain)
+ else:
+ cname_path.unlink(missing_ok=True)
 
 
 def setup(app: Sphinx) -> dict[str, Any]: