$ git clone -n https://src.fedoraproject.org/rpms/libXv.git /var/lib/mock/f31-build-67834-30103/root/thebuilddir/tmp/scmroot/libXv
Cloning into '/var/lib/mock/f31-build-67834-30103/root/thebuilddir/tmp/scmroot/libXv'...
$ git reset --hard e9043e0c1b81e1179591ed35c689a294e3dbd14e
HEAD is now at e9043e0 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild