$ git clone -n https://src.fedoraproject.org/rpms/xz.git /var/lib/mock/f31-build-61160-28827/root/chroot_tmpdir/scmroot/xz
Cloning into '/var/lib/mock/f31-build-61160-28827/root/chroot_tmpdir/scmroot/xz'...
$ git reset --hard baf9da8fd6418b0ee338a86ef5cdb945fb4113e5
HEAD is now at baf9da8 - Rebuilt for https://fedoraproject.org/wiki/Fedora_30_Mass_Rebuild