$ git clone -n https://src.fedoraproject.org/rpms/R-colorspace.git /var/lib/mock/f45-build-6033-345/root/chroot_tmpdir/scmroot/R-colorspace
Cloning into '/var/lib/mock/f45-build-6033-345/root/chroot_tmpdir/scmroot/R-colorspace'...
$ git fetch origin 13562faf8b74984e6a72c9a8d39fe1108a0e1933:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-colorspace
 * [new ref]         13562faf8b74984e6a72c9a8d39fe1108a0e1933 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 13562fa Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild