$ git clone -n https://src.fedoraproject.org/rpms/R-RUnit.git /var/lib/mock/f41-build-1017305-17926/root/chroot_tmpdir/scmroot/R-RUnit
Cloning into '/var/lib/mock/f41-build-1017305-17926/root/chroot_tmpdir/scmroot/R-RUnit'...
$ git fetch origin 590eb2d3c5fafbb536c9dc0b92e733de503f9264:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-RUnit
 * [new ref]         590eb2d3c5fafbb536c9dc0b92e733de503f9264 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 590eb2d Eliminate use of obsolete %patchN syntax (#2283636)