$ git clone -n https://src.fedoraproject.org/rpms/R-selectr.git /var/lib/mock/f45-build-6419-348/root/chroot_tmpdir/scmroot/R-selectr
Cloning into '/var/lib/mock/f45-build-6419-348/root/chroot_tmpdir/scmroot/R-selectr'...
$ git fetch origin 2fc3e6a1174af0ec07a0cce35762bf07750c8ccb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-selectr
 * [new ref]         2fc3e6a1174af0ec07a0cce35762bf07750c8ccb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2fc3e6a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild