$ git clone -n https://src.fedoraproject.org/rpms/golang-github-segmentio-asm.git /var/lib/mock/f40-build-2002137-44676/root/chroot_tmpdir/scmroot/golang-github-segmentio-asm
Cloning into '/var/lib/mock/f40-build-2002137-44676/root/chroot_tmpdir/scmroot/golang-github-segmentio-asm'...
$ git fetch origin 786ec62c7756f32125cd4cc62ce694f978722815:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-segmentio-asm
 * [new ref]         786ec62c7756f32125cd4cc62ce694f978722815 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 786ec62 Disable some tests