$ git clone -n https://src.fedoraproject.org/rpms/libnuml.git /var/lib/mock/f40-build-785351-133891/root/chroot_tmpdir/scmroot/libnuml
Cloning into '/var/lib/mock/f40-build-785351-133891/root/chroot_tmpdir/scmroot/libnuml'...
$ git fetch origin 615b775a779c0131c21d4499d53a70f322216134:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libnuml
 * [new ref]         615b775a779c0131c21d4499d53a70f322216134 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 615b775 Exclude ix86 architectures