$ git clone -n https://src.fedoraproject.org/rpms/lpsk31.git /var/lib/mock/f45-build-17520-501/root/chroot_tmpdir/scmroot/lpsk31
Cloning into '/var/lib/mock/f45-build-17520-501/root/chroot_tmpdir/scmroot/lpsk31'...
$ git fetch origin 6a60f6f53ca00705e8dc6097a765aa0b2f63c3a7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lpsk31
 * [new ref]         6a60f6f53ca00705e8dc6097a765aa0b2f63c3a7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6a60f6f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild