$ git clone -n https://src.fedoraproject.org/rpms/texlive-collection-plaingeneric.git /var/lib/mock/f45-build-37121-711/root/chroot_tmpdir/scmroot/texlive-collection-plaingeneric
Cloning into '/var/lib/mock/f45-build-37121-711/root/chroot_tmpdir/scmroot/texlive-collection-plaingeneric'...
$ git fetch origin 711648907c6de43cfdab66110c861d9e3203dd3a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/texlive-collection-plaingeneric
 * [new ref]         711648907c6de43cfdab66110c861d9e3203dd3a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7116489 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild