$ git clone -n http://8.131.229.236/anolis-os/ipxe /var/lib/mock/dist-el8-updates-build-16792-2666/root/chroot_tmpdir/scmroot/ipxe
Cloning into '/var/lib/mock/dist-el8-updates-build-16792-2666/root/chroot_tmpdir/scmroot/ipxe'...
$ git reset --hard origin/a8
HEAD is now at 31db4b0 update to ipxe-20181214-6.git133f4c47.el8_2.src.rpm