$ git clone -n https://src.fedoraproject.org/rpms/golang-github-miekg-dns.git /var/lib/mock/f45-build-12237-440/root/chroot_tmpdir/scmroot/golang-github-miekg-dns
Cloning into '/var/lib/mock/f45-build-12237-440/root/chroot_tmpdir/scmroot/golang-github-miekg-dns'...
$ git fetch origin c5f4b2ea665bcbc36245bd9448a953c069625457:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-miekg-dns
 * [new ref]         c5f4b2ea665bcbc36245bd9448a953c069625457 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c5f4b2e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild