diff --git a/hgext/narrow/narrowbundle2.py b/hgext/narrow/narrowbundle2.py
--- a/hgext/narrow/narrowbundle2.py
+++ b/hgext/narrow/narrowbundle2.py
@@ -19,6 +19,7 @@ from mercurial import (
     repair,
     requirements,
     scmutil,
+    transaction,
     util,
     wireprototypes,
 )
@@ -293,7 +294,7 @@ def handlechangegroup_widen(op, inpart):
     finally:
         f.close()
 
-    repair.cleanup_undo_files(repo)
+    transaction.cleanup_undo_files(repo)
 
     # Remove partial backup only if there were no exceptions
     op._widen_uninterr.__exit__(None, None, None)
diff --git a/mercurial/repair.py b/mercurial/repair.py
--- a/mercurial/repair.py
+++ b/mercurial/repair.py
@@ -7,8 +7,6 @@
 # GNU General Public License version 2 or any later version.
 
 
-import errno
-
 from .i18n import _
 from .node import (
     hex,
@@ -31,7 +29,6 @@ from . import (
 )
 from .utils import (
     hashutil,
-    stringutil,
     urlutil,
 )
 
@@ -114,43 +111,6 @@ def _collectbrokencsets(repo, files, str
     return s
 
 
-UNDO_BACKUP = b'undo.backupfiles'
-
-
-def cleanup_undo_files(repo):
-    """remove "undo" files used by the rollback logic
-
-    This is useful to prevent rollback running in situation were it does not
-    make sense. For example after a strip.
-    """
-    backup_entries = []
-    undo_files = []
-    vfsmap = repo.vfs_map
-    try:
-        with repo.svfs(UNDO_BACKUP) as f:
-            backup_entries = transaction.read_backup_files(repo.ui.warn, f)
-    except OSError as e:
-        if e.errno != errno.ENOENT:
-            msg = _(b'could not read %s: %s\n')
-            msg %= (repo.svfs.join(UNDO_BACKUP), stringutil.forcebytestr(e))
-            repo.ui.warn(msg)
-
-    for location, f, backup_path, c in backup_entries:
-        if location in vfsmap and backup_path:
-            undo_files.append((vfsmap[location], backup_path))
-
-    undo_files.append((repo.svfs, UNDO_BACKUP))
-    undo_files.extend(repo.undofiles())
-    for undovfs, undofile in undo_files:
-        try:
-            undovfs.unlink(undofile)
-        except OSError as e:
-            if e.errno != errno.ENOENT:
-                msg = _(b'error removing %s: %s\n')
-                msg %= (undovfs.join(undofile), stringutil.forcebytestr(e))
-                repo.ui.warn(msg)
-
-
 def strip(ui, repo, nodelist, backup=True, topic=b'backup'):
     # This function requires the caller to lock the repo, but it operates
     # within a transaction of its own, and thus requires there to be no current
@@ -299,7 +259,7 @@ def strip(ui, repo, nodelist, backup=Tru
                 bmchanges = [(m, repo[newbmtarget].node()) for m in updatebm]
                 repo._bookmarks.applychanges(repo, tr, bmchanges)
 
-            cleanup_undo_files(repo)
+            transaction.cleanup_undo_files(repo)
 
         except:  # re-raises
             if backupfile:
diff --git a/mercurial/streamclone.py b/mercurial/streamclone.py
--- a/mercurial/streamclone.py
+++ b/mercurial/streamclone.py
@@ -20,10 +20,10 @@ from . import (
     narrowspec,
     phases,
     pycompat,
-    repair,
     requirements as requirementsmod,
     scmutil,
     store,
+    transaction,
     util,
 )
 from .revlogutils import (
@@ -932,4 +932,4 @@ def local_copy(src_repo, dest_repo):
             dest_repo.store.write(tr)
 
         # clean up transaction file as they do not make sense
-        repair.cleanup_undo_files(dest_repo)
+        transaction.cleanup_undo_files(dest_repo)
diff --git a/mercurial/transaction.py b/mercurial/transaction.py
--- a/mercurial/transaction.py
+++ b/mercurial/transaction.py
@@ -11,6 +11,7 @@
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
+import errno
 import os
 
 from .i18n import _
@@ -39,6 +40,43 @@ def active(func):
     return _active
 
 
+UNDO_BACKUP = b'undo.backupfiles'
+
+
+def cleanup_undo_files(repo):
+    """remove "undo" files used by the rollback logic
+
+    This is useful to prevent rollback running in situation were it does not
+    make sense. For example after a strip.
+    """
+    backup_entries = []
+    undo_files = []
+    vfsmap = repo.vfs_map
+    try:
+        with repo.svfs(UNDO_BACKUP) as f:
+            backup_entries = read_backup_files(repo.ui.warn, f)
+    except OSError as e:
+        if e.errno != errno.ENOENT:
+            msg = _(b'could not read %s: %s\n')
+            msg %= (repo.svfs.join(UNDO_BACKUP), stringutil.forcebytestr(e))
+            repo.ui.warn(msg)
+
+    for location, f, backup_path, c in backup_entries:
+        if location in vfsmap and backup_path:
+            undo_files.append((vfsmap[location], backup_path))
+
+    undo_files.append((repo.svfs, UNDO_BACKUP))
+    undo_files.extend(repo.undofiles())
+    for undovfs, undofile in undo_files:
+        try:
+            undovfs.unlink(undofile)
+        except OSError as e:
+            if e.errno != errno.ENOENT:
+                msg = _(b'error removing %s: %s\n')
+                msg %= (undovfs.join(undofile), stringutil.forcebytestr(e))
+                repo.ui.warn(msg)
+
+
 def _playback(
     journal,
     report,