$ git clone -n https://src.fedoraproject.org/rpms/composefs.git /var/lib/mock/f40-build-2275818-55107/root/chroot_tmpdir/scmroot/composefs
Cloning into '/var/lib/mock/f40-build-2275818-55107/root/chroot_tmpdir/scmroot/composefs'...
$ git fetch origin bc817ad62fce5bfbc41251aff039847d4261b86a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/composefs
 * [new ref]         bc817ad62fce5bfbc41251aff039847d4261b86a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bc817ad Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild