$ git clone -n https://github.com/xcp-ng-rpms/xen.git /var/lib/mock/v8.1-base-1721-1202/root/chroot_tmpdir/scmroot/xen
Cloning into '/var/lib/mock/v8.1-base-1721-1202/root/chroot_tmpdir/scmroot/xen'...
$ git reset --hard 4d1582621bc4fd767fe2ee43938a9f6694bb5743
Downloading SOURCES/xen-4.13.0.tar.gz (6.1 MB)
HEAD is now at 4d15826 Merge branch 'XS-8.1'