$ git clone -n https://src.fedoraproject.org/rpms/R-cli.git /var/lib/mock/f45-build-6005-345/root/chroot_tmpdir/scmroot/R-cli
Cloning into '/var/lib/mock/f45-build-6005-345/root/chroot_tmpdir/scmroot/R-cli'...
$ git fetch origin 710fcbb467d9ab5f729698846b98b3d06933579b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-cli
 * [new ref]         710fcbb467d9ab5f729698846b98b3d06933579b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 710fcbb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild