$ git clone -n https://src.fedoraproject.org/rpms/z3.git /var/lib/mock/f42-build-3367111-45050/root/chroot_tmpdir/scmroot/z3
Cloning into '/var/lib/mock/f42-build-3367111-45050/root/chroot_tmpdir/scmroot/z3'...
$ git fetch origin b0d1169569a7096061218d382b5d6458d34f6982:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/z3
 * [new ref]         b0d1169569a7096061218d382b5d6458d34f6982 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b0d1169 Version 4.14.0