$ git clone -n https://github.com/xcp-ng-rpms/xen.git /var/lib/mock/v8.1-testing-2154-1687/root/chroot_tmpdir/scmroot/xen
Cloning into '/var/lib/mock/v8.1-testing-2154-1687/root/chroot_tmpdir/scmroot/xen'...
$ git reset --hard 6e7a73ba1b7410cdf06af3af2e1f4620f7addca5
Downloading SOURCES/xen-4.13.0.tar.gz (6.1 MB)
HEAD is now at 6e7a73b Rebuild for missing changelog