$ git clone -n https://src.fedoraproject.org/rpms/R-udunits2.git /var/lib/mock/f31-build-100487-33267/root/chroot_tmpdir/scmroot/R-udunits2
Cloning into '/var/lib/mock/f31-build-100487-33267/root/chroot_tmpdir/scmroot/R-udunits2'...
$ git reset --hard b815595d59d2f0f6f5d695ecadc48a9d9ca5f5f7
HEAD is now at b815595 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild