Reduce Docker image size. resolves wallabag#269

Size (uncompressed): Previous 573.1 MB  /  This PR 225.8 MB
Container startup time is faster. Ansible and chown where slow
Build time is 3 times faster. Less packages and TAR download
No changes required by the user. Same env vars, same paths, same core packages ...

* Update Alpine 3.14. gnu-libiconv is already fixed in this version
* Remove heavy packages: ansible, git, make, bash ...
* Download Wallabag TAR. Is faster and git is not required
* Replace environment variables with envsubst
* Reorder steps to build faster and reduce image size

Dockerfile

@@ -1,21 +1,15 @@
-FROM alpine:3.12
+FROM alpine:3.14
 
 LABEL maintainer "Marvin Steadfast <[email protected]>"
 
 ARG WALLABAG_VERSION=2.4.2
 
-RUN apk add gnu-libiconv --update-cache --repository http://dl-cdn.alpinelinux.org/alpine/edge/community/ --allow-untrusted
-ENV LD_PRELOAD /usr/lib/preloadable_libiconv.so php
-
+# Install dependencies
 RUN set -ex \
  && apk update \
- && apk upgrade --available \
  && apk add \
-      ansible \
       curl \
-      git \
       libwebp \
-      mariadb-client \
       nginx \
       pcre \
       php7 \
@@ -49,24 +43,38 @@ RUN set -ex \
       py-simplejson \
       rabbitmq-c \
       s6 \
-      tar \
       tzdata \
-      make \
-      bash \
+     #  make \
+     #  bash \
  && rm -rf /var/cache/apk/* \
  && ln -sf /dev/stdout /var/log/nginx/access.log \
- && ln -sf /dev/stderr /var/log/nginx/error.log \
+ && ln -sf /dev/stderr /var/log/nginx/error.log
+
+# Install composer
+RUN set -ex \
  && curl -s https://getcomposer.org/installer | php \
- && mv composer.phar /usr/local/bin/composer \
- && composer selfupdate --1 \
- && git clone --branch $WALLABAG_VERSION --depth 1 https://github.com/wallabag/wallabag.git /var/www/wallabag
+ && mv composer.phar /usr/local/bin/composer
+
+# Install envsubst
+RUN set -ex \
+ && curl -L -o /usr/local/bin/envsubst https://github.com/a8m/envsubst/releases/download/v1.1.0/envsubst-`uname -s`-`uname -m` \
+ && chmod +x /usr/local/bin/envsubst
+
+# Download Wallabag
+RUN set -ex \
+ && curl -L -o /tmp/wallabag.tar.gz https://github.com/wallabag/wallabag/archive/$WALLABAG_VERSION.tar.gz \
+ && tar xvf /tmp/wallabag.tar.gz -C /tmp \
+ && mv /tmp/wallabag-*/ /var/www/wallabag \
+ && rm -rf /tmp/wallabag*
 
+# Copy resources
 COPY root /
 
+# Install Wallabag
 RUN set -ex \
  && cd /var/www/wallabag \
  && SYMFONY_ENV=prod composer install --no-dev -o --prefer-dist --no-progress \
- && chown -R nobody:nobody /var/www/wallabag
+ && rm -rf /root/.composer/* /var/www/wallabag/var/cache/* /var/www/wallabag/var/logs/* /var/www/wallabag/var/sessions/*
 
 EXPOSE 80
 ENTRYPOINT ["/entrypoint.sh"]

root/entrypoint.sh

@@ -1,11 +1,14 @@
 #!/bin/sh
 
 provisioner () {
-    echo "Starting provisioner..."
-    if ! out=`ansible-playbook -i /etc/ansible/hosts /etc/ansible/entrypoint.yml -c local "$@"`;then
-        echo $out;
-    fi
-    echo "Provisioner finished."
+    echo "Setting up Wallabag..."
+
+    cd /var/www/wallabag
+    /usr/local/bin/envsubst < app/config/parameters.template > app/config/parameters.yml
+    SYMFONY_ENV=prod composer install --no-dev -o --prefer-dist --no-progress --quiet
+    chown -R nobody:nobody /var/www/wallabag/var
+
+    echo "Ready"
 }
 
 if [ "$1" = "wallabag" ];then
@@ -14,14 +17,12 @@ if [ "$1" = "wallabag" ];then
 fi
 
 if [ "$1" = "import" ];then
-    provisioner --skip-tags=firstrun
-    cd /var/www/wallabag/
+    provisioner
     exec su -c "bin/console wallabag:import:redis-worker --env=prod $2 -vv" -s /bin/sh nobody
 fi
 
 if [ "$1" = "migrate" ];then
     provisioner
-    cd /var/www/wallabag/
     exec su -c "bin/console doctrine:migrations:migrate --env=prod --no-interaction" -s /bin/sh nobody
 fi