$ git clone -n https://src.fedoraproject.org/rpms/weasyprint.git /var/lib/mock/f42-bootstrap-3462999-45594/root/chroot_tmpdir/scmroot/weasyprint
Cloning into '/var/lib/mock/f42-bootstrap-3462999-45594/root/chroot_tmpdir/scmroot/weasyprint'...
$ git fetch origin 12e495680c66957c95ab315f47e8d86967bd4f44:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/weasyprint
 * [new ref]         12e495680c66957c95ab315f47e8d86967bd4f44 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 12e4956 update to 64.1