diff -r 27f1191b1305 -r 3aab2330b7d3 mercurial/metadata.py
--- a/mercurial/metadata.py	Mon Apr 19 11:22:24 2021 +0200
+++ b/mercurial/metadata.py	Mon Apr 19 11:22:24 2021 +0200
@@ -14,12 +14,10 @@
 from .node import nullrev
 from . import (
     error,
-    requirements as requirementsmod,
     util,
 )
 
 from .revlogutils import (
-    constants as revlogconst,
     flagutil as sidedataflag,
     sidedata as sidedatamod,
 )
@@ -824,18 +822,6 @@
     return sidedata, (flags_to_add, 0)
 
 
-def set_sidedata_spec_for_repo(repo):
-    if requirementsmod.COPIESSDC_REQUIREMENT in repo.requirements:
-        repo.register_wanted_sidedata(sidedatamod.SD_FILES)
-    repo.register_sidedata_computer(
-        revlogconst.KIND_CHANGELOG,
-        sidedatamod.SD_FILES,
-        (sidedatamod.SD_FILES,),
-        copies_sidedata_computer,
-        sidedataflag.REVIDX_HASCOPIESINFO,
-    )
-
-
 def _sidedata_worker(srcrepo, revs_queue, sidedata_queue, tokens):
     """The function used by worker precomputing sidedata