$ git clone -n https://src.fedoraproject.org/rpms/libtar.git /var/lib/mock/f31-build-100338-33252/root/thebuilddir/tmp/scmroot/libtar
Cloning into '/var/lib/mock/f31-build-100338-33252/root/thebuilddir/tmp/scmroot/libtar'...
$ git reset --hard 67a998a70f329bc247c40c04477c09c0571d0938
HEAD is now at 67a998a - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild