$ git clone -n https://github.com/xcp-ng-rpms/kernel-alt.git /var/lib/mock/v8.3-base-4136-4013/root/chroot_tmpdir/scmroot/kernel-alt
Cloning into '/var/lib/mock/v8.3-base-4136-4013/root/chroot_tmpdir/scmroot/kernel-alt'...
$ git reset --hard 2ae118d942bee9c576c5f6ae09fc89fa96f6a2a7
Downloading SOURCES/kernel-4.19.19.tar.gz (161 MB)
HEAD is now at 2ae118d Rebuild for XCP-ng 8.3 alpha