$ git clone -n https://src.fedoraproject.org/rpms/libb64.git /var/lib/mock/f31-build-68089-30153/root/chroot_tmpdir/scmroot/libb64
Cloning into '/var/lib/mock/f31-build-68089-30153/root/chroot_tmpdir/scmroot/libb64'...
$ git reset --hard 192c0fb97905cf656cbba3d1fe7c61fea8f70a5e
HEAD is now at 192c0fb - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild