$ git clone -n https://github.com/xcp-ng-rpms/kernel-alt.git /var/lib/mock/v8.1-testing-2921-2411/root/chroot_tmpdir/scmroot/kernel-alt
Cloning into '/var/lib/mock/v8.1-testing-2921-2411/root/chroot_tmpdir/scmroot/kernel-alt'...
$ git reset --hard 28b7be2fd6698b3ed8918b90fc1cb7afe89f54ba
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HEAD is now at 28b7be2 Security update + fix a consequence of XSA-332 (kernel panic) (#12)