Open browser window in the host from a container

Dockerfile

FROM ubuntu:22.04
RUN apt-get update && apt-get install -y \
    socat \
    && rm -rf /var/lib/apt
COPY x-www-browser /usr/bin/x-www-browser
RUN chmod +x /usr/bin/x-www-browser

run-me.sh

#!/bin/bash

socat \
    unix-listen:/run/user/$(id -u)/ck8s-open-browser.sock,fork \
    system:'xargs xdg-open' &

docker build -t ck8s-open-browser-demo .
docker run \
    --rm \
    -ti \
    --net host \
    -e PATH=$PATH \
    -v $HOME:$HOME \
    -w $HOME \
    -u $(id -u):$(id -g) \
    -v /etc/passwd:/etc/passwd:ro \
    -v /etc/group:/etc/group:ro \
    -v /etc/ssl/certs:/etc/ssl/certs:ro \
    -v /run/user/$(id -u)/ck8s-open-browser.sock:/run/user/$(id -u)/ck8s-open-browser.sock \
    ck8s-open-browser-demo

x-www-browser

#!/bin/bash
echo "Trying to open $1 in host browser" >&2
echo $1 | socat stdio unix:/run/user/$(id -u)/ck8s-open-browser.sock