$ git clone -n https://src.fedoraproject.org/rpms/golang-github-cespare-xxhash2.git /var/lib/mock/f45-build-11807-435/root/chroot_tmpdir/scmroot/golang-github-cespare-xxhash2
Cloning into '/var/lib/mock/f45-build-11807-435/root/chroot_tmpdir/scmroot/golang-github-cespare-xxhash2'...
$ git fetch origin a21cc590013a32f1c45ef3b3e8e3f045eaf5380e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-cespare-xxhash2
 * [new ref]         a21cc590013a32f1c45ef3b3e8e3f045eaf5380e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a21cc59 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild