$ git clone -n https://src.fedoraproject.org/rpms/xen.git /var/lib/mock/f33-build-221896-48451/root/chroot_tmpdir/scmroot/xen
Cloning into '/var/lib/mock/f33-build-221896-48451/root/chroot_tmpdir/scmroot/xen'...
$ git reset --hard b801938d789777d0713539d8967b5a36cef20b79
HEAD is now at b801938 build aarch64 hypervisor with -mno-outline-atomics to fix gcc 10 build