$ git clone -n https://github.com/xcp-ng-rpms/kernel-alt.git /var/lib/mock/v8.2-testing-2810-2279/root/chroot_tmpdir/scmroot/kernel-alt
Cloning into '/var/lib/mock/v8.2-testing-2810-2279/root/chroot_tmpdir/scmroot/kernel-alt'...
$ git reset --hard a508c561c8e2b1255bd1a47c9a31a8f3263b2bb3
Downloading SOURCES/kernel-4.19.19.tar.gz (161 MB)
HEAD is now at a508c56 Fix https://github.com/xcp-ng/xcp/issues/468