Decode file:// repo paths before bootstrap bind mount

Add the Towncrier release-note snippet and mention PR #1728.

Author: Mr-Tao

mock/py/mockbuild/package_manager.py

@@ -8,6 +8,7 @@
 import sys
 import time
 import re
+from urllib.parse import unquote
 from textwrap import dedent
 from configparser import ConfigParser
 
@@ -512,6 +513,7 @@ def _bind_mount_repos_to_bootstrap(self):
                         continue
 
                     srcpath = self.expand_url_vars(srcpath)
+                    srcpath = unquote(srcpath)
 
                     if srcpath in tried:
                         continue

mock/tests/test_package_manager.py

@@ -1,6 +1,7 @@
 import os
 import tempfile
 import shutil
+from pathlib import Path
 
 import pytest
 from unittest import mock
@@ -117,6 +118,22 @@ def test_file_colon_slash_path_name_in_baseurl(self):
         assert mounts[0].bindpath.startswith(self.workdir)
         assert mounts[0].bindpath.endswith(repo_directory)
 
+    def test_urlencoded_file_path_name_in_baseurl(self):
+        repo_directory = os.path.join(self.workdir, 'repo@2')
+        os.mkdir(repo_directory)
+        config = """
+        [main]
+        something = 1
+
+        [fedora]
+        baseurl = {}
+        """.format(Path(repo_directory).as_uri())
+        mounts = self.get_user_bind_mounts_from_config(config)
+        assert len(mounts) == 1
+        assert mounts[0].srcpath == repo_directory
+        assert mounts[0].bindpath.startswith(self.workdir)
+        assert mounts[0].bindpath.endswith(repo_directory)
+
     def test_dir_doesnt_exist(self):
         repo_directory = os.path.join(self.workdir, 'repo')
         config = """

releng/release-notes-next/decode-percent-escaped-bootstrap-file-repos.bugfix.md

@@ -0,0 +1,4 @@
+Mock now decodes percent-escaped local `file://` repository paths before
+checking them for bootstrap bind mounts. This fixes bootstrap package-manager
+access to host-local repositories whose paths contain characters such as `@`
+and therefore appear escaped in file URIs, as in [PR#1728][].