$ git clone -n https://src.fedoraproject.org/rpms/R-pbdRPC.git /var/lib/mock/f41-build-1111491-20153/root/chroot_tmpdir/scmroot/R-pbdRPC
Cloning into '/var/lib/mock/f41-build-1111491-20153/root/chroot_tmpdir/scmroot/R-pbdRPC'...
$ git fetch origin 259ef8aa38cefae3d496ad0cda237a7989b3a571:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-pbdRPC
 * [new ref]         259ef8aa38cefae3d496ad0cda237a7989b3a571 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 259ef8a Eliminate use of obsolete %patchN syntax (#2283636)