$ git clone -n https://src.fedoraproject.org/rpms/R-sciplot.git /var/lib/mock/f45-build-6402-348/root/chroot_tmpdir/scmroot/R-sciplot
Cloning into '/var/lib/mock/f45-build-6402-348/root/chroot_tmpdir/scmroot/R-sciplot'...
$ git fetch origin f1d311be74e86818b4804f6156658f7d95c882a4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-sciplot
 * [new ref]         f1d311be74e86818b4804f6156658f7d95c882a4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f1d311b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild