$ git clone -n https://src.fedoraproject.org/rpms/xz.git /var/lib/mock/f31-build-71669-30670/root/chroot_tmpdir/scmroot/xz
Cloning into '/var/lib/mock/f31-build-71669-30670/root/chroot_tmpdir/scmroot/xz'...
$ git reset --hard f8dce18f578564a42cfd9811c0b46299604995e9
HEAD is now at f8dce18 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild