$ git clone -n https://src.fedoraproject.org/rpms/sha2.git /var/lib/mock/f45-build-35856-699/root/chroot_tmpdir/scmroot/sha2
Cloning into '/var/lib/mock/f45-build-35856-699/root/chroot_tmpdir/scmroot/sha2'...
$ git fetch origin ae783a8f14ab0d8753ae2702a4933ec0f9ab724d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sha2
 * [new ref]         ae783a8f14ab0d8753ae2702a4933ec0f9ab724d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ae783a8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild