RUN apt-get update \
	&& apt-get install -y --no-install-recommends \
		apache2 \
	&& rm -rf /var/lib/apt/lists/*

ENV APACHE_CONFDIR /etc/apache2
ENV APACHE_ENVVARS $APACHE_CONFDIR/envvars

RUN set -eux; \
	\
# generically convert lines like
#   export APACHE_RUN_USER=www-data
# into
#   : ${APACHE_RUN_USER:=www-data}
#   export APACHE_RUN_USER
# so that they can be overridden at runtime ("-e APACHE_RUN_USER=...")
	sed -ri 's/^export ([^=]+)=(.*)$/: ${\1:=\2}\nexport \1/' "$APACHE_ENVVARS"; \
	\
# setup directories and permissions
	. "$APACHE_ENVVARS"; \
	for dir in \
		"$APACHE_LOCK_DIR" \
		"$APACHE_RUN_DIR" \
		"$APACHE_LOG_DIR" \
		/var/www/html \
	; do \
		rm -rvf "$dir"; \
		mkdir -p "$dir"; \
		chown "$APACHE_RUN_USER:$APACHE_RUN_GROUP" "$dir"; \
# allow running as an arbitrary user (https://github.com/docker-library/php/issues/743)
		chmod 777 "$dir"; \
	done; \
	\
# logs should go to stdout / stderr
	ln -sfT /dev/stderr "$APACHE_LOG_DIR/error.log"; \
	ln -sfT /dev/stdout "$APACHE_LOG_DIR/access.log"; \
	ln -sfT /dev/stdout "$APACHE_LOG_DIR/other_vhosts_access.log"; \
	chown -R --no-dereference "$APACHE_RUN_USER:$APACHE_RUN_GROUP" "$APACHE_LOG_DIR"

# Apache + PHP requires preforking Apache for best results
RUN a2dismod mpm_event && a2enmod mpm_prefork

# PHP files should be handled by PHP, and should be preferred over any other file type
RUN { \
		echo '<FilesMatch \.php$>'; \
		echo '\tSetHandler application/x-httpd-php'; \
		echo '</FilesMatch>'; \
		echo; \
		echo 'DirectoryIndex disabled'; \
		echo 'DirectoryIndex index.php index.html'; \
		echo; \
		echo '<Directory /var/www/>'; \
		echo '\tOptions -Indexes'; \
		echo '\tAllowOverride All'; \
		echo '</Directory>'; \
	} | tee "$APACHE_CONFDIR/conf-available/docker-php.conf" \
	&& a2enconf docker-php

ENV PHP_EXTRA_BUILD_DEPS apache2-dev
ENV PHP_EXTRA_CONFIGURE_ARGS --with-apxs2 --disable-cgi