$ git clone -n https://github.com/xcp-ng-rpms/kernel.git /var/lib/mock/v8.1-testing-2681-2103/root/chroot_tmpdir/scmroot/kernel
Cloning into '/var/lib/mock/v8.1-testing-2681-2103/root/chroot_tmpdir/scmroot/kernel'...
$ git reset --hard 3a4cdbf6382d6ff04cd0039746645cd77ce1e8a8
Downloading SOURCES/kernel-4.19.19.tar.gz (161 MB)
HEAD is now at 3a4cdbf Merge branch 'XS-8.1' into 8.1