$ git clone -n https://github.com/xcp-ng-rpms/kernel-alt /var/lib/mock/v8.1-base-2029-1414/root/chroot_tmpdir/scmroot/kernel-alt
Cloning into '/var/lib/mock/v8.1-base-2029-1414/root/chroot_tmpdir/scmroot/kernel-alt'...
$ git reset --hard a81a17cbce4f2643807409dfac77742b800083a4
Downloading SOURCES/kernel-4.19.19.tar.gz (161 MB)
HEAD is now at a81a17c Releasing kernel-alt 4.19.102