Remove unused dependencies

Dockerfile

@@ -1,33 +1,67 @@
 FROM php:7.3-apache
 LABEL maintainer="Andy Miller <[email protected]> (@rhukster)"
 
+# runtime dependencies
+RUN set -ex; \
+    \
+    apt-get update; \
+    apt-get install -y --no-install-recommends \
+        busybox \
+    ; \
+    rm -rf /var/lib/apt/lists/*; \
+    \
+    mkdir -p /var/spool/cron/crontabs; \
+    echo '* * * * * php -f /var/www/html/bin/grav scheduler 1>> /dev/null 2>&1' > /var/spool/cron/crontabs/www-data
+
 # Enable Apache Rewrite + Expires Module
 RUN a2enmod rewrite expires && \
     sed -i 's/ServerTokens OS/ServerTokens ProductOnly/g' \
     /etc/apache2/conf-available/security.conf
 
-# Install dependencies
-RUN apt-get update && apt-get install -y --no-install-recommends \
-    unzip \
-    libfreetype6-dev \
-    libjpeg62-turbo-dev \
-    libpng-dev \
-    libyaml-dev \
-    libzip4 \
-    libzip-dev \
-    zlib1g-dev \
-    libicu-dev \
-    g++ \
-    git \
-    cron \
-    vim \
-    && docker-php-ext-install opcache \
-    && docker-php-ext-configure intl \
-    && docker-php-ext-install intl \
-    && docker-php-ext-configure gd --with-freetype --with-jpeg \
-    && docker-php-ext-install -j$(nproc) gd \
-    && docker-php-ext-install zip \
-    && rm -rf /var/lib/apt/lists/*
+RUN set -ex; \
+    \
+    savedAptMark="$(apt-mark showmanual)"; \
+    \
+    apt-get update; \
+    apt-get install -y --no-install-recommends \
+        libfreetype6-dev \
+        libicu-dev \
+        libjpeg-dev \
+        libpng-dev \
+        libyaml-dev \
+        libzip-dev \
+    ; \
+    \
+    docker-php-ext-configure gd --with-freetype --with-jpeg; \
+    docker-php-ext-install -j "$(nproc)" \
+        gd \
+        intl \
+        opcache \
+        zip \
+    ; \
+    \
+# pecl will claim success even if one install fails, so we need to perform each install separately
+    pecl install APCu-5.1.18; \
+    pecl install yaml-2.0.4; \
+    \
+    docker-php-ext-enable \
+        apcu \
+        yaml \
+    ; \
+    \
+# reset apt-mark's "manual" list so that "purge --auto-remove" will remove all build dependencies
+    apt-mark auto '.*' > /dev/null; \
+    apt-mark manual $savedAptMark; \
+    ldd "$(php -r 'echo ini_get("extension_dir");')"/*.so \
+        | awk '/=>/ { print $3 }' \
+        | sort -u \
+        | xargs -r dpkg-query -S \
+        | cut -d: -f1 \
+        | sort -u \
+        | xargs -rt apt-mark manual; \
+    \
+    apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false; \
+    rm -rf /var/lib/apt/lists/*
 
 # set recommended PHP.ini settings
 # see https://secure.php.net/manual/en/opcache.installation.php
@@ -43,29 +77,16 @@ RUN { \
     echo 'expose_php=off'; \
     } > /usr/local/etc/php/conf.d/php-recommended.ini
 
-RUN pecl install apcu \
-    && pecl install yaml-2.0.4 \
-    && docker-php-ext-enable apcu yaml
-
-# Set user to www-data
-RUN chown www-data:www-data /var/www
-USER www-data
-
 # Define Grav specific version of Grav or use latest stable
 ENV GRAV_VERSION latest
 
 # Install grav
-WORKDIR /var/www
-RUN curl -o grav-admin.zip -SL https://getgrav.org/download/core/grav-admin/${GRAV_VERSION} && \
-    unzip grav-admin.zip && \
-    mv -T /var/www/grav-admin /var/www/html && \
-    rm grav-admin.zip
-
-# Create cron job for Grav maintenance scripts
-RUN (crontab -l; echo "* * * * * cd /var/www/html;/usr/local/bin/php bin/grav scheduler 1>> /dev/null 2>&1") | crontab -
-
-# Return to root user
-USER root
+RUN set -ex; \
+    curl -o grav-admin.zip -fsSL https://getgrav.org/download/core/grav-admin/${GRAV_VERSION}; \
+    busybox unzip -qd /var/www grav-admin.zip; \
+    rm -r /var/www/html; \
+    mv -T /var/www/grav-admin /var/www/html; \
+    chown www-data:www-data -R /var/www/html
 
 # Copy init scripts
 # COPY docker-entrypoint.sh /entrypoint.sh
@@ -75,4 +96,4 @@ VOLUME ["/var/www/html"]
 
 # ENTRYPOINT ["/entrypoint.sh"]
 # CMD ["apache2-foreground"]
-CMD ["sh", "-c", "cron && apache2-foreground"]
+CMD ["sh", "-c", "busybox crond && apache2-foreground"]

README.md

@@ -2,15 +2,13 @@
 
 This currently is pretty minimal and uses:
 
-* apache-2.4.38
+* Apache httpd 2.4
+* BusyBox
 * GD library
-* Unzip library
 * php7.3
 * php7.3-opcache
 * php7.3-acpu
 * php7.3-yaml
-* cron
-* vim editor
 
 ## Persisting data