$ git clone -n https://github.com/xcp-ng-rpms/kernel.git /var/lib/mock/v8.1-base-1691-1186/root/chroot_tmpdir/scmroot/kernel
Cloning into '/var/lib/mock/v8.1-base-1691-1186/root/chroot_tmpdir/scmroot/kernel'...
$ git reset --hard 584691d233554ac50a08176cb24e05c6ad00ac72
Downloading SOURCES/kernel-4.19.19.tar.gz (161 MB)
HEAD is now at 584691d Rebuild for rebuilt libdrm (bootstrap)