$ git clone -n https://src.fedoraproject.org/rpms/ursa-major.git /var/lib/mock/f39-build-2111817-50664/root/chroot_tmpdir/scmroot/ursa-major
Cloning into '/var/lib/mock/f39-build-2111817-50664/root/chroot_tmpdir/scmroot/ursa-major'...
$ git fetch origin ac54f85fe9fa1d28c5cca599af35a8529422f214:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ursa-major
 * [new ref]         ac54f85fe9fa1d28c5cca599af35a8529422f214 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ac54f85 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild