$ git clone -n https://src.fedoraproject.org/rpms/js-d3-flame-graph.git /var/lib/mock/f41-build-786004-13590/root/chroot_tmpdir/scmroot/js-d3-flame-graph
Cloning into '/var/lib/mock/f41-build-786004-13590/root/chroot_tmpdir/scmroot/js-d3-flame-graph'...
$ git fetch origin 94c522d3b9066e6a1033cebfbab77d58520565f4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/js-d3-flame-graph
 * [new ref]         94c522d3b9066e6a1033cebfbab77d58520565f4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 94c522d Eliminate use of obsolete %patchN syntax (#2283636)