$ git clone -n https://github.com/xcp-ng-rpms/xen.git /var/lib/mock/v8.1-testing-2655-2056/root/chroot_tmpdir/scmroot/xen
Cloning into '/var/lib/mock/v8.1-testing-2655-2056/root/chroot_tmpdir/scmroot/xen'...
$ git reset --hard 88b1a8206e683a257d97a6f1f5d8d48360761891
Downloading SOURCES/xen-4.13.0.tar.gz (6.1 MB)
HEAD is now at 88b1a82 Merge branch 'XS-8.1' into 8.1