$ git clone -n https://github.com/xcp-ng-rpms/kernel-4.9 /var/lib/mock/dev-testing-336-100/root/chroot_tmpdir/scmroot/kernel-4.9
Cloning into '/var/lib/mock/dev-testing-336-100/root/chroot_tmpdir/scmroot/kernel-4.9'...
$ git reset --hard aa972bd45251b04cfa2905ea69f78dec0a8fa700
Downloading SOURCES/kernel-exp-4.9.135.tar.gz (144 MB)
HEAD is now at aa972bd Fix build of source RPM on koji