$ git clone -n https://github.com/xcp-ng-rpms/xen.git /var/lib/mock/v8.1-testing-2144-1677/root/chroot_tmpdir/scmroot/xen
Cloning into '/var/lib/mock/v8.1-testing-2144-1677/root/chroot_tmpdir/scmroot/xen'...
$ git reset --hard 6324868593149a0a011897225b620c3bd32b6608
Downloading SOURCES/xen-4.13.0.tar.gz (6.1 MB)
HEAD is now at 6324868 Merge branch 'XS-8.1'