$ git clone -n https://src.fedoraproject.org/rpms/jasper.git /var/lib/mock/f40-build-789057-135502/root/chroot_tmpdir/scmroot/jasper
Cloning into '/var/lib/mock/f40-build-789057-135502/root/chroot_tmpdir/scmroot/jasper'...
$ git fetch origin 130b9525ac570cba41c535384e4cb415f4749dc8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jasper
 * [new ref]         130b9525ac570cba41c535384e4cb415f4749dc8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 130b952 Fix i686 build