$ git clone -n https://github.com/xcp-ng-rpms/kernel-alt.git /var/lib/mock/v8.1-base-2057-1462/root/chroot_tmpdir/scmroot/kernel-alt
Cloning into '/var/lib/mock/v8.1-base-2057-1462/root/chroot_tmpdir/scmroot/kernel-alt'...
$ git reset --hard abfa9fc16782d0bdb27597d84397b71160d912d2
Downloading SOURCES/kernel-4.19.19.tar.gz (161 MB)
HEAD is now at abfa9fc Handle grub menu entries for kernel-alt