$ git clone -n https://src.fedoraproject.org/rpms/R-rtracklayer.git /var/lib/mock/f33-build-391266-62303/root/chroot_tmpdir/scmroot/R-rtracklayer
Cloning into '/var/lib/mock/f33-build-391266-62303/root/chroot_tmpdir/scmroot/R-rtracklayer'...
$ git reset --hard 21d1353a5e0e1bd5b4abb4ce7d9fe68e44a54308
HEAD is now at 21d1353 - Second attempt - Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild