$ git clone -n https://src.fedoraproject.org/rpms/libnjb.git /var/lib/mock/f31-build-69712-30339/root/chroot_tmpdir/scmroot/libnjb
Cloning into '/var/lib/mock/f31-build-69712-30339/root/chroot_tmpdir/scmroot/libnjb'...
$ git reset --hard 21b59b1f93436a75cd8749456de67444e95f1cc7
HEAD is now at 21b59b1 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild