$ git clone -n https://github.com/xcp-ng-rpms/xen.git /var/lib/mock/v8.3-base-3903-3839/root/chroot_tmpdir/scmroot/xen
Cloning into '/var/lib/mock/v8.3-base-3903-3839/root/chroot_tmpdir/scmroot/xen'...
$ git reset --hard 32030d9d0750957a0dd66093acf25cbe752ecb85
Downloading SOURCES/xen-4.13.4.tar.gz (6.1 MB)
HEAD is now at 32030d9 Merge branch 'XS-8.3'