$ git clone -n https://src.fedoraproject.org/rpms/xen.git /var/lib/mock/f37-build-side-32-misc-devel-307504-14929/root/chroot_tmpdir/scmroot/xen
Cloning into '/var/lib/mock/f37-build-side-32-misc-devel-307504-14929/root/chroot_tmpdir/scmroot/xen'...
$ git reset --hard 158b3ce973c1130ee91c5a80060017e6a6c41cc0
HEAD is now at 158b3ce update to xen-4.16.3