$ git clone -n https://github.com/xcp-ng-rpms/xen.git /var/lib/mock/v8.1-testing-2747-2160/root/chroot_tmpdir/scmroot/xen
Cloning into '/var/lib/mock/v8.1-testing-2747-2160/root/chroot_tmpdir/scmroot/xen'...
$ git reset --hard 6f7733e143983b1b770a001f170caa4a5a170938
Downloading SOURCES/xen-4.13.0.tar.gz (6.1 MB)
HEAD is now at 6f7733e Merge branch 'XS-8.1' into 8.1