Add fpm-alpine variant

fpm/alpine/Dockerfile

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+FROM php:5.6-fpm-alpine
+
+# install the PHP extensions we need
+RUN apk add --no-cache --virtual .build-deps \
+		autoconf gcc libc-dev make \
+		libpng-dev libjpeg-turbo-dev \
+	&& docker-php-ext-configure gd --with-png-dir=/usr --with-jpeg-dir=/usr \
+	&& docker-php-ext-install gd mysqli opcache \
+	&& find /usr/local/lib/php/extensions -name '*.a' -delete \
+	&& find /usr/local/lib/php/extensions -name '*.so' -exec strip --strip-all '{}' \; \
+	&& runDeps="$( \
+		scanelf --needed --nobanner --recursive \
+			/usr/local/lib/php/extensions \
+			| awk '{ gsub(/,/, "\nso:", $2); print "so:" $2 }' \
+			| sort -u \
+			| xargs -r apk info --installed \
+			| sort -u \
+	)" \
+	&& apk add --virtual .phpext-rundeps $runDeps \
+	&& apk del .build-deps
+
+# set recommended PHP.ini settings
+# see https://secure.php.net/manual/en/opcache.installation.php
+RUN { \
+		echo 'opcache.memory_consumption=128'; \
+		echo 'opcache.interned_strings_buffer=8'; \
+		echo 'opcache.max_accelerated_files=4000'; \
+		echo 'opcache.revalidate_freq=60'; \
+		echo 'opcache.fast_shutdown=1'; \
+		echo 'opcache.enable_cli=1'; \
+	} > /usr/local/etc/php/conf.d/opcache-recommended.ini
+
+VOLUME /var/www/html
+
+ENV WORDPRESS_VERSION 4.4.2
+ENV WORDPRESS_SHA1 7444099fec298b599eb026e83227462bcdf312a6
+
+# upstream tarballs include ./wordpress/ so this gives us /usr/src/wordpress
+RUN curl -o wordpress.tar.gz -SL https://wordpress.org/wordpress-${WORDPRESS_VERSION}.tar.gz \
+	&& echo "$WORDPRESS_SHA1 *wordpress.tar.gz" | sha1sum -c - \
+	&& tar -xzf wordpress.tar.gz -C /usr/src/ \
+	&& rm wordpress.tar.gz \
+	&& chown -R www-data:www-data /usr/src/wordpress
+
+COPY docker-entrypoint.sh /entrypoint.sh
+
+# grr, ENTRYPOINT resets CMD now
+ENTRYPOINT ["/entrypoint.sh"]
+CMD ["php-fpm"]

fpm/alpine/docker-entrypoint.sh

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+#!/bin/sh
+set -e
+
+if [ "${1#apache*}" != "$1" ] || [ "$1" = "php-fpm" ]; then
+	if [ -n "$MYSQL_PORT_3306_TCP" ]; then
+		if [ -z "$WORDPRESS_DB_HOST" ]; then
+			WORDPRESS_DB_HOST='mysql'
+		else
+			echo >&2 'warning: both WORDPRESS_DB_HOST and MYSQL_PORT_3306_TCP found'
+			echo >&2 "  Connecting to WORDPRESS_DB_HOST ($WORDPRESS_DB_HOST)"
+			echo >&2 '  instead of the linked mysql container'
+		fi
+	fi
+
+	if [ -z "$WORDPRESS_DB_HOST" ]; then
+		echo >&2 'error: missing WORDPRESS_DB_HOST and MYSQL_PORT_3306_TCP environment variables'
+		echo >&2 '  Did you forget to --link some_mysql_container:mysql or set an external db'
+		echo >&2 '  with -e WORDPRESS_DB_HOST=hostname:port?'
+		exit 1
+	fi
+
+	# if we're linked to MySQL and thus have credentials already, let's use them
+	: ${WORDPRESS_DB_USER:=${MYSQL_ENV_MYSQL_USER:-root}}
+	if [ "$WORDPRESS_DB_USER" = 'root' ]; then
+		: ${WORDPRESS_DB_PASSWORD:=$MYSQL_ENV_MYSQL_ROOT_PASSWORD}
+	fi
+	: ${WORDPRESS_DB_PASSWORD:=$MYSQL_ENV_MYSQL_PASSWORD}
+	: ${WORDPRESS_DB_NAME:=${MYSQL_ENV_MYSQL_DATABASE:-wordpress}}
+
+	if [ -z "$WORDPRESS_DB_PASSWORD" ]; then
+		echo >&2 'error: missing required WORDPRESS_DB_PASSWORD environment variable'
+		echo >&2 '  Did you forget to -e WORDPRESS_DB_PASSWORD=... ?'
+		echo >&2
+		echo >&2 '  (Also of interest might be WORDPRESS_DB_USER and WORDPRESS_DB_NAME.)'
+		exit 1
+	fi
+
+	if ! [ -e index.php -a -e wp-includes/version.php ]; then
+		echo >&2 "WordPress not found in $(pwd) - copying now..."
+		if [ "$(ls -A)" ]; then
+			echo >&2 "WARNING: $(pwd) is not empty - press Ctrl+C now if this is an error!"
+			( set -x; ls -A; sleep 10 )
+		fi
+		tar cf - -C /usr/src/wordpress . | tar xf -
+		echo >&2 "Complete! WordPress has been successfully copied to $(pwd)"
+		if [ ! -e .htaccess ]; then
+			# NOTE: The "Indexes" option is disabled in the php:apache base image
+			cat > .htaccess <<-'EOF'
+				# BEGIN WordPress
+				<IfModule mod_rewrite.c>
+				RewriteEngine On
+				RewriteBase /
+				RewriteRule ^index\.php$ - [L]
+				RewriteCond %{REQUEST_FILENAME} !-f
+				RewriteCond %{REQUEST_FILENAME} !-d
+				RewriteRule . /index.php [L]
+				</IfModule>
+				# END WordPress
+			EOF
+			chown www-data:www-data .htaccess
+		fi
+	fi
+
+	# TODO handle WordPress upgrades magically in the same way, but only if wp-includes/version.php's $wp_version is less than /usr/src/wordpress/wp-includes/version.php's $wp_version
+
+	# version 4.4.1 decided to switch to windows line endings, that breaks our seds and awks
+	# https://github.com/docker-library/wordpress/issues/116
+	# https://github.com/WordPress/WordPress/commit/1acedc542fba2482bab88ec70d4bea4b997a92e4
+	sed -ri 's/\r\n|\r/\n/g' wp-config*
+
+	if [ ! -e wp-config.php ]; then
+		awk '/^\/\*.*stop editing.*\*\/$/ && c == 0 { c = 1; system("cat") } { print }' wp-config-sample.php > wp-config.php <<'EOPHP'
+// If we're behind a proxy server and using HTTPS, we need to alert Wordpress of that fact
+// see also http://codex.wordpress.org/Administration_Over_SSL#Using_a_Reverse_Proxy
+if (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] === 'https') {
+	$_SERVER['HTTPS'] = 'on';
+}
+
+EOPHP
+		chown www-data:www-data wp-config.php
+	fi
+
+	# see http://stackoverflow.com/a/2705678/433558
+	sed_escape_lhs() {
+		echo "$@" | sed 's/[]\/$*.^|[]/\\&/g'
+	}
+	sed_escape_rhs() {
+		echo "$@" | sed 's/[\/&]/\\&/g'
+	}
+	php_escape() {
+		php -r 'var_export(('$2') $argv[1]);' "$1"
+	}
+	set_config() {
+		key="$1"
+		value="$2"
+		var_type="${3:-string}"
+		start="(['\"])$(sed_escape_lhs "$key")\2\s*,"
+		end="\);"
+		if [ "${key#$}" != "$key" ]; then
+			start="^(\s*)$(sed_escape_lhs "$key")\s*="
+			end=";"
+		fi
+		sed -ri "s/($start\s*).*($end)$/\1$(sed_escape_rhs "$(php_escape "$value" "$var_type")")\3/" wp-config.php
+	}
+
+	set_config 'DB_HOST' "$WORDPRESS_DB_HOST"
+	set_config 'DB_USER' "$WORDPRESS_DB_USER"
+	set_config 'DB_PASSWORD' "$WORDPRESS_DB_PASSWORD"
+	set_config 'DB_NAME' "$WORDPRESS_DB_NAME"
+
+	# allow any of these "Authentication Unique Keys and Salts." to be specified via
+	# environment variables with a "WORDPRESS_" prefix (ie, "WORDPRESS_AUTH_KEY")
+	UNIQUES="
+		AUTH_KEY
+		SECURE_AUTH_KEY
+		LOGGED_IN_KEY
+		NONCE_KEY
+		AUTH_SALT
+		SECURE_AUTH_SALT
+		LOGGED_IN_SALT
+		NONCE_SALT
+	"
+	for unique in ${UNIQUES}; do
+		eval unique_value=\$WORDPRESS_$unique
+		if [ "$unique_value" ]; then
+			set_config "$unique" "$unique_value"
+		else
+			# if not specified, let's generate a random value
+			current_set="$(sed -rn "s/define\((([\'\"])$unique\2\s*,\s*)(['\"])(.*)\3\);/\4/p" wp-config.php)"
+			if [ "$current_set" = 'put your unique phrase here' ]; then
+				set_config "$unique" "$(head -c1M /dev/urandom | sha1sum | cut -d' ' -f1)"
+			fi
+		fi
+	done
+
+	if [ "$WORDPRESS_TABLE_PREFIX" ]; then
+		set_config '$table_prefix' "$WORDPRESS_TABLE_PREFIX"
+	fi
+
+	if [ "$WORDPRESS_DEBUG" ]; then
+		set_config 'WP_DEBUG' 1 boolean
+	fi
+
+	TERM=dumb php -- "$WORDPRESS_DB_HOST" "$WORDPRESS_DB_USER" "$WORDPRESS_DB_PASSWORD" "$WORDPRESS_DB_NAME" <<'EOPHP'
+<?php
+// database might not exist, so let's try creating it (just to be safe)
+
+$stderr = fopen('php://stderr', 'w');
+
+list($host, $port) = explode(':', $argv[1], 2);
+
+$maxTries = 10;
+do {
+	$mysql = new mysqli($host, $argv[2], $argv[3], '', (int)$port);
+	if ($mysql->connect_error) {
+		fwrite($stderr, "\n" . 'MySQL Connection Error: (' . $mysql->connect_errno . ') ' . $mysql->connect_error . "\n");
+		--$maxTries;
+		if ($maxTries <= 0) {
+			exit(1);
+		}
+		sleep(3);
+	}
+} while ($mysql->connect_error);
+
+if (!$mysql->query('CREATE DATABASE IF NOT EXISTS `' . $mysql->real_escape_string($argv[4]) . '`')) {
+	fwrite($stderr, "\n" . 'MySQL "CREATE DATABASE" Error: ' . $mysql->error . "\n");
+	$mysql->close();
+	exit(1);
+}
+
+$mysql->close();
+EOPHP
+fi
+
+exec "$@"