$ git clone -n https://src.fedoraproject.org/rpms/irtt.git /var/lib/mock/f45-build-14249-458/root/chroot_tmpdir/scmroot/irtt
Cloning into '/var/lib/mock/f45-build-14249-458/root/chroot_tmpdir/scmroot/irtt'...
$ git fetch origin 5fe0db2d8a44d08eaf342b61acb4f9300ab58257:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/irtt
 * [new ref]         5fe0db2d8a44d08eaf342b61acb4f9300ab58257 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5fe0db2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild