$ git clone -n https://src.fedoraproject.org/rpms/golang-github-zeebo-float16.git /var/lib/mock/f41-build-1036529-18736/root/chroot_tmpdir/scmroot/golang-github-zeebo-float16
Cloning into '/var/lib/mock/f41-build-1036529-18736/root/chroot_tmpdir/scmroot/golang-github-zeebo-float16'...
$ git fetch origin 2f153d6f73dc5df3acc2e4774e7dd37f6dbc5983:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-zeebo-float16
 * [new ref]         2f153d6f73dc5df3acc2e4774e7dd37f6dbc5983 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2f153d6 Fix FTBFS