$ git clone -n https://src.fedoraproject.org/rpms/libcgroup.git /var/lib/mock/f31-build-58308-28434/root/chroot_tmpdir/scmroot/libcgroup
Cloning into '/var/lib/mock/f31-build-58308-28434/root/chroot_tmpdir/scmroot/libcgroup'...
$ git reset --hard 6b669b3172713836082de54fa808f682e5a6f2cb
HEAD is now at 6b669b3 - Rebuilt for https://fedoraproject.org/wiki/Fedora_30_Mass_Rebuild