$ git clone -n https://src.fedoraproject.org/rpms/nrg2iso.git /var/lib/mock/f45-build-19792-555/root/chroot_tmpdir/scmroot/nrg2iso
Cloning into '/var/lib/mock/f45-build-19792-555/root/chroot_tmpdir/scmroot/nrg2iso'...
$ git fetch origin adfbd600e1497cd9be16c875c9a5447d3ee8cfe7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nrg2iso
 * [new ref]         adfbd600e1497cd9be16c875c9a5447d3ee8cfe7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at adfbd60 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild