docker-entrypoint.sh

#!/bin/bash
set -e

if [ -z "$MYSQL_PORT_3306_TCP" ]; then
	echo >&2 'error: missing MYSQL_PORT_3306_TCP environment variable'
	echo >&2 '  Did you forget to --link some_mysql_container:mysql ?'
	exit 1
fi

# if we're linked to MySQL, and we're using the root user, and our linked
# container has a default "root" password set up and passed through... :)
: ${WORDPRESS_DB_USER:=root}
if [ "$WORDPRESS_DB_USER" = 'root' ]; then
	: ${WORDPRESS_DB_PASSWORD:=$MYSQL_ENV_MYSQL_ROOT_PASSWORD}
fi
: ${WORDPRESS_DB_NAME:=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
	rsync --archive --one-file-system --quiet /usr/src/wordpress/ ./
	echo >&2 "Complete! WordPress has been successfully copied to $(pwd)"
	if [ ! -e .htaccess ]; then
		cat > .htaccess <<-'EOF'
			RewriteEngine On
			RewriteBase /
			RewriteRule ^index\.php$ - [L]
			RewriteCond %{REQUEST_FILENAME} !-f
			RewriteCond %{REQUEST_FILENAME} !-d
			RewriteRule . /index.php [L]
		EOF
	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

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
fi

set_config() {
	key="$1"
	value="$2"
	php_escaped_value="$(php -r 'var_export($argv[1]);' "$value")"
	sed_escaped_value="$(echo "$php_escaped_value" | sed 's/[\/&]/\\&/g')"
	sed -ri "s/((['\"])$key\2\s*,\s*)(['\"]).*\3/\1$sed_escaped_value/" wp-config.php
}

WORDPRESS_DB_HOST="${MYSQL_PORT_3306_TCP#tcp://}"

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" "$unique_value"
	else
		# if not specified, let's generate a random value
		set_config "$unique" "$(head -c1M /dev/urandom | sha1sum | cut -d' ' -f1)"
	fi
done

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)

list($host, $port) = explode(':', $argv[1], 2);
$mysql = new mysqli($host, $argv[2], $argv[3], '', (int)$port);

if ($mysql->connect_error) {
	file_put_contents('php://stderr', 'MySQL Connection Error: (' . $mysql->connect_errno . ') ' . $mysql->connect_error . "\n");
	exit(1);
}

if (!$mysql->query('CREATE DATABASE IF NOT EXISTS `' . $mysql->real_escape_string($argv[4]) . '`')) {
	file_put_contents('php://stderr', 'MySQL "CREATE DATABASE" Error: ' . $mysql->error . "\n");
	$mysql->close();
	exit(1);
}

$mysql->close();
EOPHP

chown -R www-data:www-data .

exec "$@"