$ git clone -n https://src.fedoraproject.org/rpms/R-nanotime.git /var/lib/mock/f38-build-side-42-init-devel-962243-28791/root/chroot_tmpdir/scmroot/R-nanotime
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-962243-28791/root/chroot_tmpdir/scmroot/R-nanotime'...
$ git fetch origin 9159af126f2d86925cce315e73b8236d624d82ba:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-nanotime
 * [new ref]         9159af126f2d86925cce315e73b8236d624d82ba -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9159af1 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild