$ git clone -n https://src.fedoraproject.org/rpms/serp.git /var/lib/mock/f38-build-side-42-init-devel-1320619-30692/root/chroot_tmpdir/scmroot/serp
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1320619-30692/root/chroot_tmpdir/scmroot/serp'...
$ git fetch origin 6acd1dd3e0b59c1d775fb476ed0b6ae6b5ad0dae:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/serp
 * [new ref]         6acd1dd3e0b59c1d775fb476ed0b6ae6b5ad0dae -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6acd1dd Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild