$ git clone -n https://src.fedoraproject.org/rpms/golang-github-gorilla-mux.git /var/lib/mock/f45-build-12004-437/root/chroot_tmpdir/scmroot/golang-github-gorilla-mux
Cloning into '/var/lib/mock/f45-build-12004-437/root/chroot_tmpdir/scmroot/golang-github-gorilla-mux'...
$ git fetch origin c141eb0ec7171dfb9bb226369f3e76d202180acf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-gorilla-mux
 * [new ref]         c141eb0ec7171dfb9bb226369f3e76d202180acf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c141eb0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild