$ git clone -n https://src.fedoraproject.org/rpms/hydra.git /var/lib/mock/f38-build-side-42-init-devel-739901-27652/root/chroot_tmpdir/scmroot/hydra
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-739901-27652/root/chroot_tmpdir/scmroot/hydra'...
$ git fetch origin cb72b99b06effdeaa0981554ce55bdedc4d657a9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/hydra
 * [new ref]         cb72b99b06effdeaa0981554ce55bdedc4d657a9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cb72b99 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild