$ git clone -n https://src.fedoraproject.org/rpms/R-sys.git /var/lib/mock/f31-build-114700-34466/root/chroot_tmpdir/scmroot/R-sys
Cloning into '/var/lib/mock/f31-build-114700-34466/root/chroot_tmpdir/scmroot/R-sys'...
$ git reset --hard 0fe24283513d5e77a1f5b6271dd8624b2e641f28
HEAD is now at 0fe2428 Update to latest version.