$ git clone -n https://src.fedoraproject.org/rpms/golang-github-zmap-rc2.git /var/lib/mock/f45-build-12612-442/root/chroot_tmpdir/scmroot/golang-github-zmap-rc2
Cloning into '/var/lib/mock/f45-build-12612-442/root/chroot_tmpdir/scmroot/golang-github-zmap-rc2'...
$ git fetch origin b0bc9cc473e0d4d59480800056fc8cc56a03dadf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-zmap-rc2
 * [new ref]         b0bc9cc473e0d4d59480800056fc8cc56a03dadf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b0bc9cc Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild