$ git clone -n https://src.fedoraproject.org/rpms/river.git /var/lib/mock/f38-build-side-42-init-devel-1369716-30706/root/chroot_tmpdir/scmroot/river
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1369716-30706/root/chroot_tmpdir/scmroot/river'...
$ git fetch origin 498e40ef9c90e63ba09f7ef4c9585f3cb641f4a4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/river
 * [new ref]         498e40ef9c90e63ba09f7ef4c9585f3cb641f4a4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 498e40e Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild