$ git clone -n https://src.fedoraproject.org/rpms/irrlicht.git /var/lib/mock/f45-build-14233-458/root/chroot_tmpdir/scmroot/irrlicht
Cloning into '/var/lib/mock/f45-build-14233-458/root/chroot_tmpdir/scmroot/irrlicht'...
$ git fetch origin d1b0b2903dc50566b9492af46df8dfe15ac356a3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/irrlicht
 * [new ref]         d1b0b2903dc50566b9492af46df8dfe15ac356a3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d1b0b29 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild