#!/bin/bash
set -e
if [[ "" == apache2* ]] || [ "" == 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 - --one-file-system -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(('') $argv[1]);' ""
}
set_config() {
key=""
value=""
var_type="${3:-string}"
start="(['\"])$(sed_escape_lhs "$key")\s*,"
end="\);"
if [ "${key:0:1}" = '$' ]; then
start="^(\s*)$(sed_escape_lhs "$key")\s*="
end=";"
fi
sed -ri "s/($start\s*).*($end)$/$(sed_escape_rhs "$(php_escape "$value" "$var_type")")/" wp-config.php
}
set_config 'DB_HOST' "$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\((([\'\"])$unique\s*,\s*)(['\"])(.*)\);//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);
}
$mysql->close();
EOPHP
fi
exec "$@"
谁告诉你环境变量可以用于传输配置文件了…
可以用环境变量的意思是，有些软件既能识别环境变量中提供的配置，又能识别文件形式的配置，不过，很不幸，Nginx不在此列。
以wget为例，当设定HTTP代理时，可以选用以下任一方式：
在配置文件中加一行
http_proxy = http://example.com/xxx将系统环境变量
$http_proxy设定为http://example.com/xxx两种方法的作用是相同的。
当然，你可以在Docker容器里写一个Shell脚本，根据环境变量来修改配置文件的内容，但这就是另一个话题了。Github上有不少实现类似功能的工具，如Tiller。
补充一个资料：How Should I Get Application Configuration into my Docker Containers?
哦，在启动容器的时候要带参数，比如：
./docker run --detach --name wordpress --net wordnet --publish 80:80 --env WORDPRESS_DB_HOST=mysql --env WORDPRESS_DB_PASSWORD=xxxxxxxx wordpress:4.4
当然在容器启动命令里要处理带进来的参数：
cat /entrypoint.sh