Fix PUID and PGID handling (#711)

Dockerfile

@@ -6,7 +6,7 @@ WORKDIR /var/www/html
 
 # Update packages and install dependencies
 RUN apk upgrade --no-cache && \
-    apk add --no-cache sqlite-dev libpng libpng-dev libjpeg-turbo libjpeg-turbo-dev freetype freetype-dev curl autoconf libgomp icu-dev icu-data-full nginx dcron tzdata imagemagick imagemagick-dev libzip-dev sqlite libwebp-dev && \
+    apk add --no-cache shadow sqlite-dev libpng libpng-dev libjpeg-turbo libjpeg-turbo-dev freetype freetype-dev curl autoconf libgomp icu-dev icu-data-full nginx dcron tzdata imagemagick imagemagick-dev libzip-dev sqlite libwebp-dev && \
     docker-php-ext-install pdo pdo_sqlite calendar && \
     docker-php-ext-enable pdo pdo_sqlite && \
     docker-php-ext-configure gd --with-freetype --with-jpeg --with-webp && \

README.md

@@ -114,10 +114,12 @@ See instructions to run Wallos below.
 ```bash
 docker run -d --name wallos -v /path/to/config/wallos/db:/var/www/html/db \
 -v /path/to/config/wallos/logos:/var/www/html/images/uploads/logos \
--e TZ=Europe/Berlin -p 8282:80 --restart unless-stopped \
+-e TZ=Europe/Berlin -e PUID=82 -e PGID=82 -p 8282:80 --restart unless-stopped \
 bellamy/wallos:latest
 ```
 
+Note: PUID and PGUID are optional, defaults to 82. Will let you run as an arbitrary user.
+
 ### Docker Compose
 
 ```
@@ -129,6 +131,9 @@ services:
       - "8282:80/tcp"
     environment:
       TZ: 'America/Toronto'
+      # PUID and PGUID are optional, defaults to 82. Will let you run as an arbitrary user.
+      # PUID: 82 
+      # PGID: 82
     # Volumes store your data between container upgrades
     volumes:
       - './db:/var/www/html/db'

startup.sh

@@ -2,12 +2,15 @@
 
 echo "Startup script is running..." > /var/log/startup.log
 
-# If the PUID or PGID environment variables are set, create a new user and group
-if [ ! -z "$PUID" ] && [ ! -z "$PGID" ]; then
-    addgroup -g $PGID appgroup
-    adduser -D -u $PUID -G appgroup appuser
-    chown -R appuser:appgroup /var/www/html
-fi
+# Default the PUID and PGID environment variables to 82, otherwise
+# set to the user defined ones.
+PUID=${PUID:-82}
+PGID=${PGID:-82}
+
+# Change the www-data user id and group id to be the user-specified ones
+groupmod -o -g "$PGID" www-data
+usermod -o -u "$PUID" www-data
+chown -R www-data:www-data /var/www/html
 
 # Start both PHP-FPM and Nginx
 php-fpm & nginx -g 'daemon off;' & touch ~/startup.txt