$ git clone -n https://src.fedoraproject.org/rpms/R-farver.git /var/lib/mock/f43-build-58895085-6569073/root/chroot_tmpdir/scmroot/R-farver
Cloning into '/var/lib/mock/f43-build-58895085-6569073/root/chroot_tmpdir/scmroot/R-farver'...
$ git fetch origin dbd2eee59456e46b17057bafe79c885451eaf96d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-farver
 * [new ref]         dbd2eee59456e46b17057bafe79c885451eaf96d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dbd2eee R-maint-sig mass rebuild