## Dockerfile
cat >Dockerfile <<- 'Dockerfile'
# syntax = docker/dockerfile:1.2
FROM quay.io/archlinux/archlinux:base-devel
USER root

# Docker ENV variables
# # Required
# ENV MYVNC_VNCPASS
# # Optional
# ENV MYVNC_CUSTOM_TITLE
# ENV MYVNC_PROXYPATH       (eg, "/subpath/" or "/subpath")
# ENV MYVNC_VNCSHARING      (eg, "true" to allow sharing (defaults to "false"))
# ENV MYVNC_VNCSERVER_HOST  (eg, localhost or 192.168.1.1)
# ENV MYVNC_VNCSERVER_PORT  (eg, 5900)

# Build ARG for additional pacman packages to install (eg, openssh)
ARG pkg

# Install packages
COPY mirrorlist /etc/pacman.d/mirrorlist
RUN pacman-key --init \
    && sed -i '/ParallelDownloads/c ParallelDownloads = 10' /etc/pacman.conf \
    && pacman -Sy --ask 4 archlinux-keyring \
    && pacman -Su --ask 4 --needed \
        sudo ${pkg} \
        inetutils python-numpy python-setuptools \
        nginx-mainline \
    && pacman -Scc --ask 4 \
    && useradd --create-home --gid users --shell /usr/bin/bash user \
    && echo 'user ALL=(ALL:ALL) NOPASSWD: MISCELLANEOUS, /usr/bin/nginx' >/etc/sudoers.d/zz-DOCKER \
    && echo 'Defaults lecture = never' >>/etc/sudoers.d/zz-DOCKER \
    && passwd -l root >/dev/null 2>&1 \
    && sed '/^http {/a\ \
   include /app/nginx/\*.conf;\n\ \
   types_hash_max_size 4096;\n\ \
   server_names_hash_bucket_size 128;\n' -i /etc/nginx/nginx.conf \
    && mkdir -p /app/init.d /app/nginx /app/logs

# Install noVNC
COPY novnc /app/novnc

# Install all init scripts
COPY docker-entrypoint.sh /docker-entrypoint.sh
COPY 01-init.sh 10-novnc.sh 10-nginx.sh /app/init.d/

# Proper permissions
RUN chmod +x /docker-entrypoint.sh /app/init.d/* \
    && chown -R user:users /app

# Default environment
USER user
WORKDIR /home/user
ENV DISPLAY :0
ENV SHELL /usr/bin/bash

# Expose nginx port for VNC webui
EXPOSE 6900

# Docker entrypoint
ENTRYPOINT ["/docker-entrypoint.sh"]
Dockerfile

## Init script, always runs first
cat >01-init.sh <<- '01-init.sh'
#!/usr/bin/env bash
# Create base directories
for dir in vnc config ssh
do
    [ -d ~/.${dir} ] || mkdir -p ~/.${dir}
done

## OPTIONAL: More commands may be added below

01-init.sh

## NoVNC setup
cat >10-novnc.sh <<- '10-novnc.sh'
#!/usr/bin/env bash
# Turn vnc sharing on/off
if [[ ${MYVNC_VNCSHARING} == "true" ]] || [[ ${MYVNC_VNCSHARING} == "1" ]]
then
    _MYVNC_VNCSHARING=true
else
    _MYVNC_VNCSHARING=false
fi

# Always default to remote scaling
sed -i "/UI.initSetting\|resize/ s/resize', '.*');/resize', 'scale');/" /app/novnc/app/ui.js

# Always default to autoconnect=true
sed -i "/let autoconnect/ s/autoconnect', .*);/autoconnect', true);/" /app/novnc/app/ui.js

# Change vnc shared view settings (defaults to false/off)
sed -i "/UI.initSetting\|shared/ s/shared', .*);/shared', ${_MYVNC_VNCSHARING});/" /app/novnc/app/ui.js

# NoVNC custom title
sed -i "/<title>noVNC<\/title>/ s/noVNC/${MYVNC_CUSTOM_TITLE:-noVNC}/g" /app/novnc/*.html

# Apply subpath to websocket
if [[ ${MYVNC_PROXYPATH} == "/" ]]
then
    unset _MYVNC_PROXYPATH
elif [ ${MYVNC_PROXYPATH} ]
then
    _MYVNC_PROXYPATH=$(echo ${MYVNC_PROXYPATH%/} | sed "s|^.*/||")
    sed -i "/UI.initSetting/ s|websockify|${_MYVNC_PROXYPATH}/&|" /app/novnc/app/ui.js
fi

# Start NoVNC
/app/novnc/utils/novnc_proxy \
    --listen 6080 \
    --vnc ${MYVNC_VNCSERVER_HOST:-localhost}:${MYVNC_VNCSERVER_PORT:-5900} \
    --file-only &
10-novnc.sh

## Nginx setup
cat >10-nginx.sh <<- '10-nginx.sh'
#!/usr/bin/env bash
# Reformat path
if [[ ${MYVNC_PROXYPATH} == "/" ]]
then
    unset _MYVNC_PROXYPATH
elif [ ${MYVNC_PROXYPATH} ]
then
    _MYVNC_PROXYPATH=$(echo ${MYVNC_PROXYPATH%/} | sed "s|^.*/||;s|^|/|")
fi

# Add novnc virtual proxy conf
cat >/app/nginx/novnc.conf <<- novnc
upstream vnc_proxy {
    server 127.0.0.1:6080;
}

server {
    listen 6900;

    location ${_MYVNC_PROXYPATH}/websockify {
        proxy_http_version 1.1;
        proxy_pass http://vnc_proxy/;
        proxy_set_header Upgrade \$http_upgrade;
        proxy_set_header Connection "upgrade";

        # VNC connection timeout
        proxy_read_timeout 3600s;
        proxy_send_timeout 3600s;

        # Disable cache
        proxy_buffering off;
    }

    location ${_MYVNC_PROXYPATH}/ {
        index vnc.html;
        alias /app/novnc/;
        try_files \$uri \$uri/ /vnc.html;

        # In the location block related to noVNC
        add_header Cache-Control no-cache;
    }
}
novnc

# Start nginx
sudo /usr/bin/nginx -g "daemon off;" &
10-nginx.sh

## Docker entrypoint
cat >docker-entrypoint.sh <<- 'docker-entrypoint.sh'
#!/usr/bin/env bash
# Export all variables
set -a

# Abort if an error is encountered
set -e

# SSH config
if [ -f ~/.ssh/id_ed25519 ]
then
    chmod 0600 ~/.ssh/id_ed25519
fi

# Run all scripts in init folder
for file in /app/init.d/*.sh
do
    /usr/bin/bash -c ${file} >>/app/logs/$(echo ${file} | sed 's|/app/init.d/||;s|\.sh$||').log
done

# Read cli parameters
exec "${@}" &

# Monitor log
tail -f /app/logs/*.log
docker-entrypoint.sh

## Fetch latest mirrorlist
cat /etc/pacman.d/mirrorlist >mirrorlist

## Docker build
# eg, ARCHPKG=openssh
# eg, BUILDTAG=base
DOCKER_BUILDKIT=1 docker build ./. \
    --build-arg pkg=${ARCHPKG:-""} \
    --tag myvnc/${BUILDTAG:-base} \
    && rm -f Dockerfile *.sh