$ git clone -n https://src.fedoraproject.org/rpms/R-fs.git /var/lib/mock/f31-build-76949-31460/root/chroot_tmpdir/scmroot/R-fs
Cloning into '/var/lib/mock/f31-build-76949-31460/root/chroot_tmpdir/scmroot/R-fs'...
$ git reset --hard cf3c832f42a75e3b6fbe4dfbb5486b622a7fe723
HEAD is now at cf3c832 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild