De-duplicate the local-repo mountpoint in bootstrap

Complements: d4c1269
Relates: rpm-software-management#381
Relates: rpm-software-management#357
Relates: rpm-software-management#1414
Relates: rpm-software-management#1286

mock/py/mockbuild/util.py

@@ -1001,17 +1001,6 @@ def _fix_cfg(cfg):
 
     _fix_cfg(bootstrap.config)
 
-    if not baseurl.startswith("file:///") and not baseurl.startswith("/"):
-        return
-
-    local_dir = baseurl.replace("file://", "", 1)
-    if not local_dir or not os.path.isdir(local_dir):
-        return
-
-    mountpoint = bootstrap.make_chroot_path(local_dir)
-    bootstrap.mounts.add(BindMountPoint(srcpath=local_dir,
-                                        bindpath=mountpoint))
-
 
 def subscription_redhat_init(opts, uidManager):
     if not opts['redhat_subscription_required']:

releng/release-notes-next/buildroot-mounts-redundancy.bugfix

@@ -0,0 +1,5 @@
+De-duplicate mount points for local repositories (used `--chain`
+or `--localrepo=file:///repo/on/host`).   This bug was present in Mock <= 5.6,
+but after [issue#1414][] it become exposed to our testsuite.
+Related issues are [issue#357][] ([commit#a0a2cba3][]) and [issue#381][]
+([commit#16462acc][]).