$ git clone -n https://src.fedoraproject.org/rpms/golang-gopkg-tomb-1.git /var/lib/mock/f45-build-12730-443/root/chroot_tmpdir/scmroot/golang-gopkg-tomb-1
Cloning into '/var/lib/mock/f45-build-12730-443/root/chroot_tmpdir/scmroot/golang-gopkg-tomb-1'...
$ git fetch origin 0b5d294309566f4684c2c7e0e6bdaeff95aa4c32:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-gopkg-tomb-1
 * [new ref]         0b5d294309566f4684c2c7e0e6bdaeff95aa4c32 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0b5d294 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild