$ git clone -n https://src.fedoraproject.org/rpms/golang-github-openzipkin-zipkin.git /var/lib/mock/f41-build-1036218-18712/root/chroot_tmpdir/scmroot/golang-github-openzipkin-zipkin
Cloning into '/var/lib/mock/f41-build-1036218-18712/root/chroot_tmpdir/scmroot/golang-github-openzipkin-zipkin'...
$ git fetch origin b7b2a525e7c2877e69aba8ca0910f0b749550d97:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-openzipkin-zipkin
 * [new ref]         b7b2a525e7c2877e69aba8ca0910f0b749550d97 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b7b2a52 Fix FTBFS