$ git clone -n https://src.fedoraproject.org/rpms/R-curl.git /var/lib/mock/f45-build-6058-346/root/chroot_tmpdir/scmroot/R-curl
Cloning into '/var/lib/mock/f45-build-6058-346/root/chroot_tmpdir/scmroot/R-curl'...
$ git fetch origin e5e4da31ff8bd0ee0a25e9a5b9ba7cd4beb499c9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-curl
 * [new ref]         e5e4da31ff8bd0ee0a25e9a5b9ba7cd4beb499c9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e5e4da3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild