$ git clone -n https://src.fedoraproject.org/rpms/R-caTools.git /var/lib/mock/f45-build-5998-345/root/chroot_tmpdir/scmroot/R-caTools
Cloning into '/var/lib/mock/f45-build-5998-345/root/chroot_tmpdir/scmroot/R-caTools'...
$ git fetch origin dca1f899e56a1b0be19fa314cb91d02f2f32528b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-caTools
 * [new ref]         dca1f899e56a1b0be19fa314cb91d02f2f32528b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dca1f89 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild