$ git clone -n https://src.fedoraproject.org/rpms/R-readxl.git /var/lib/mock/f33-build-564660-65907/root/chroot_tmpdir/scmroot/R-readxl
Cloning into '/var/lib/mock/f33-build-564660-65907/root/chroot_tmpdir/scmroot/R-readxl'...
$ git reset --hard f488635dedba4a527ce34d846f154e28576c08eb
HEAD is now at f488635 Rebuild for libxls.