$ git clone -n https://github.com/xcp-ng-rpms/kernel-4.9.git /var/lib/mock/v7.99-base-885-356/root/chroot_tmpdir/scmroot/kernel-4.9
Cloning into '/var/lib/mock/v7.99-base-885-356/root/chroot_tmpdir/scmroot/kernel-4.9'...
$ git reset --hard 1f9c0f7e7fbb1aa3de341b2684aa7ab6dcc5fc57
Downloading SOURCES/kernel-exp-4.9.135.tar.gz (144 MB)
HEAD is now at 1f9c0f7 Add BuildRequires: gcc and update summary