$ git clone -n https://github.com/xcp-ng-rpms/kernel.git /var/lib/mock/v8.1-testing-2875-2315/root/chroot_tmpdir/scmroot/kernel
Cloning into '/var/lib/mock/v8.1-testing-2875-2315/root/chroot_tmpdir/scmroot/kernel'...
$ git reset --hard 312f475f9ed72168b97e51653fd285ba842186ec
Downloading SOURCES/kernel-4.19.19.tar.gz (161 MB)
HEAD is now at 312f475 Fix bad network performance impact of XSA-332