Risk of Rain 2 server proton runit service

run

#!/bin/sh

# Copyright (c) 2021 benaryorg <binary@benary.org>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

set -e

[ -r conf ] && . ./conf

target_user=${ROR2_USER?}
target_serverdir=${ROR2_SERVERDIR?}
target_wineprefix=${ROR2_WINEPREFIX?}
target_protondir=${ROR2_PROTONDIR?}
target_home="$(getent passwd "${target_user}" | cut -d : -f 6)"

test -e "${target_serverdir?}"
test -e "${target_wineprefix?}"
test -e "${target_protondir?}"

test "${ROR2_MODDIR+x}" != x || test -e "${ROR2_MODDIR}"
test "${ROR2_MODDIR+x}" != x || doorstep_path="Z:$(printf %s "${ROR2_MODDIR?}" | sed -E "s#/#\\\\#g")\\BepInEx\\core\\BepInEx.Preloader.dll"
test "${ROR2_MODDIR+x}" != x && doorstep_bool="false" || doorstep_bool="true"

exec chpst -u "${target_user?}" \
	unshare --mount --user --pid --map-current-user --kill-child --mount-proc \
	dumb-init \
	xvfb-run -a \
	env \
		"HOME=${target_home?}" "WINEPREFIX=${target_wineprefix?}" "PATH=${target_protondir?}/dist/bin" "WINEDLLOVERRIDES=winhttp=n,b" \
	wine \
		"${target_serverdir?}/Risk of Rain 2.exe" \
		--doorstop-enable "${doorstep_bool?}" ${doorstep_path+--doorstop-target} ${doorstep_path}

I think you'll find most of the information as to the convoluted parts here: https://twitter.com/benaryorg/status/1367012863269830656

Also big shoutout to who made this: https://github.com/avivace/ror2-server/

After some further examination it seems you need to set the HOME variable (and maybe need an entire Steam install there) for the Steamworks discovery to work (read: your server showing up in the server browser).