$ git clone -n https://github.com/xcp-ng-rpms/kernel.git /var/lib/mock/v7.99-base-457-224/root/chroot_tmpdir/scmroot/kernel
Cloning into '/var/lib/mock/v7.99-base-457-224/root/chroot_tmpdir/scmroot/kernel'...
$ git reset --hard 3a50457a99d0d015d360b27dc8fb30a7994092c0
Downloading SOURCES/kernel-4.4.52.tar.gz (134 MB)
HEAD is now at 3a50457 Add BuildRequires gcc